fix(contracts): Minimum was not read correctly

Reviewed-on: #49
Reviewed-by: Philipp Dormann <philipp@noreply.git.odit.services>

.air.linux.toml

@@ -0,0 +1,46 @@
+root = "."
+testdata_dir = "testdata"
+tmp_dir = "tmp"
+
+[build]
+  args_bin = []
+  bin = "tmp\\main"
+  cmd = "go build -o ./tmp/main ."
+  delay = 1000
+  exclude_dir = ["assets", "tmp", "vendor", "testdata"]
+  exclude_file = []
+  exclude_regex = ["_test.go"]
+  exclude_unchanged = false
+  follow_symlink = false
+  full_bin = ""
+  include_dir = []
+  include_ext = ["go", "tpl", "tmpl", "html"]
+  include_file = []
+  kill_delay = "0s"
+  log = "build-errors.log"
+  poll = false
+  poll_interval = 0
+  post_cmd = []
+  pre_cmd = []
+  rerun = false
+  rerun_delay = 500
+  send_interrupt = false
+  stop_on_error = false
+
+[color]
+  app = ""
+  build = "yellow"
+  main = "magenta"
+  runner = "green"
+  watcher = "cyan"
+
+[log]
+  main_only = false
+  time = false
+
+[misc]
+  clean_on_exit = false
+
+[screen]
+  clear_on_rebuild = false
+  keep_scroll = true

.air.windows.toml

@@ -0,0 +1,46 @@
+root = "."
+testdata_dir = "testdata"
+tmp_dir = "tmp"
+
+[build]
+  args_bin = []
+  bin = "tmp\\main.exe"
+  cmd = "go build -o ./tmp/main.exe ."
+  delay = 1000
+  exclude_dir = ["assets", "tmp", "vendor", "testdata"]
+  exclude_file = []
+  exclude_regex = ["_test.go"]
+  exclude_unchanged = false
+  follow_symlink = false
+  full_bin = ""
+  include_dir = []
+  include_ext = ["go", "tpl", "tmpl", "html"]
+  include_file = []
+  kill_delay = "0s"
+  log = "build-errors.log"
+  poll = false
+  poll_interval = 0
+  post_cmd = []
+  pre_cmd = []
+  rerun = false
+  rerun_delay = 500
+  send_interrupt = false
+  stop_on_error = false
+
+[color]
+  app = ""
+  build = "yellow"
+  main = "magenta"
+  runner = "green"
+  watcher = "cyan"
+
+[log]
+  main_only = false
+  time = false
+
+[misc]
+  clean_on_exit = false
+
+[screen]
+  clear_on_rebuild = false
+  keep_scroll = true

.dockerignore

@@ -0,0 +1,3 @@
+tmp
+docker-compose.yaml
+.air*.toml

.env

@@ -0,0 +1,19 @@
+LOGLEVEL=debug
+PORT=3000
+PRODUCION=false
+APIKEY=lfk
+EVENTNAME=Lauf für Kaya! 2025
+CURRENCYSYMBOL=€
+GOTENBERG_BASEURL=http://localhost:3001
+REDIS_ADDR=localhost:6379
+
+CARD_SUBTITLE=Kaya ist cool
+CARD_BARCODEFORMAT=ean13
+# CARD_BARCODEPREFIX=
+
+SPONSOING_RECEIPTMINIMUM=40
+SPONSORING_DISCLAIMER=Kaya ist cool, aber pass auf, dass du nicht zu viel Geld sammelst!
+SPONSORING_BARCODEFORMAT=code128
+# SPONSORING_BARCODEPREFIX=
+
+CERTIFICATE_FOOTER=Kaya ist cool, danke für deine Unterstützung!

.gitea/workflows/dev.yaml

@@ -0,0 +1,27 @@
+name: Build latest image
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-container:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Login to registry
+        uses: docker/login-action@v3
+        with:
+          registry: registry.odit.services
+          username: ${{ vars.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: |
+            ${{ vars.REGISTRY }}/lfk/document-server:latest
+          platforms: linux/amd64,linux/arm64

.gitea/workflows/release.yaml

@@ -0,0 +1,27 @@
+name: Build release images
+on:
+  push:
+    tags:
+      - "*.*.*"
+
+jobs:
+  build-container:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Login to registry
+        uses: docker/login-action@v3
+        with:
+          registry: registry.odit.services
+          username: ${{ vars.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: |
+            ${{ vars.REGISTRY }}/lfk/document-server:${{ github.ref_name }}
+          platforms: linux/amd64,linux/arm64

.gitignore

@@ -1,129 +1 @@
-# ---> VisualStudioCode
+tmp
-.vscode/*
-!.vscode/settings.json
-!.vscode/tasks.json
-!.vscode/launch.json
-!.vscode/extensions.json
-*.code-workspace
-
-# Local History for Visual Studio Code
-.history/
-
-# ---> Node
-# Logs
-logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-lerna-debug.log*
-
-# Diagnostic reports (https://nodejs.org/api/report.html)
-report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
-
-# Runtime data
-pids
-*.pid
-*.seed
-*.pid.lock
-
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
-
-# Coverage directory used by tools like istanbul
-coverage
-*.lcov
-
-# nyc test coverage
-.nyc_output
-
-# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
-# Bower dependency directory (https://bower.io/)
-bower_components
-
-# node-waf configuration
-.lock-wscript
-
-# Compiled binary addons (https://nodejs.org/api/addons.html)
-build/Release
-
-# Dependency directories
-node_modules/
-jspm_packages/
-
-# Snowpack dependency directory (https://snowpack.dev/)
-web_modules/
-
-# TypeScript cache
-*.tsbuildinfo
-
-# Optional npm cache directory
-.npm
-
-# Optional eslint cache
-.eslintcache
-
-# Microbundle cache
-.rpt2_cache/
-.rts2_cache_cjs/
-.rts2_cache_es/
-.rts2_cache_umd/
-
-# Optional REPL history
-.node_repl_history
-
-# Output of 'npm pack'
-*.tgz
-
-# Yarn Integrity file
-.yarn-integrity
-
-# dotenv environment variables file
-.env
-.env.test
-
-# parcel-bundler cache (https://parceljs.org/)
-.cache
-.parcel-cache
-
-# Next.js build output
-.next
-out
-
-# Nuxt.js build / generate output
-.nuxt
-dist
-
-# Gatsby files
-.cache/
-# Comment in the public line in if your project uses Gatsby and not Next.js
-# https://nextjs.org/blog/next-9-1#public-directory-support
-# public
-
-# vuepress build output
-.vuepress/dist
-
-# Serverless directories
-.serverless/
-
-# FuseBox cache
-.fusebox/
-
-# DynamoDB Local files
-.dynamodb/
-
-# TernJS port file
-.tern-port
-
-# Stores VSCode versions used for testing VSCode extensions
-.vscode-test
-
-# yarn v2
-.yarn/cache
-.yarn/unplugged
-.yarn/build-state.yml
-.yarn/install-state.gz
-.pnp.*
-

Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:1.23-alpine AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o server
+
+FROM scratch
+COPY --from=builder /app/server /server
+COPY static /static
+ADD https://curl.haxx.se/ca/cacert.pem /etc/ssl/certs/ca-certificates.crt
+ENTRYPOINT [ "/server" ]

LICENSE

@@ -1,362 +0,0 @@
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README.md

@@ -1,3 +1,96 @@
-# document-server
+# ✒️ Document generation microservices
 
-The document generation server responsible for creating pdfs for sponsoring contracts, certificates and more.
+## Features
+
+- 📝 HTML templates for pdf generation
+- 📚 OpenAPI/Swagger documentation
+- ⚡ High-performance with go and gotenberg
+
+## 🚀 Quick Start
+
+```bash
+# Install dependencies
+go mod download
+
+# Run the server
+air
+```
+
+## 📖 API Documentation
+
+Swagger UI is available at: `/swagger`
+
+## 🛠️ Development
+
+The project uses:
+
+- 🏃‍♂️ go as the language and build tool
+- 🌐 gofiber for the web framework
+- 📦 air for live reload
+- 📝 swaggo for API documentation
+- 📄 gotenberg for HTML to PDF conversion
+
+### 📦 Use docker compose for external dependencies
+
+```shell
+docker compose -f docker-compose.dev.yaml up
+```
+
+### 🏃 Run via air
+
+> Install air via `go install github.com/air-verse/air@latest`
+
+```shell
+# With the default air config
+air
+
+# With the config for linux/macOS
+air -c .air.linux.toml
+
+# With the config for windows
+air -c .air.windows.toml
+```
+
+### ✒️ Update the swagger docs
+
+> Install swag via `go install github.com/swaggo/swag/cmd/swag@latest`
+
+```shell
+swag init
+```
+
+### 🐋 Build container
+
+```shell
+# single arch
+docker build -t registry.odit.services/lfk/document-server:latest .
+
+# multiarch
+docker buildx build --platform=linux/amd64,linux/arm64 -t registry.odit.services/lfk/document-server:latest --push .
+```
+
+## ⏱️ Benchmarks
+
+### Barcode Generation
+
+- Requests: 10000
+- Concurrency: Unlimited
+- Data: `123456789123`
+- Width: 1000
+- Height: 500
+
+#### No cache (cold start)
+
+| Format  | Data           | Requests/sec | Slowest | Fastest | Average |
+| ------- | -------------- | ------------ | ------- | ------- | ------- |
+| Code128 | `123456789123` | 763.3996     | 0.7995  | 0.0172  | 0.0654  |
+| EAN13   | `123456789123` | 767.1170     | 0.7607  | 0.0171  | 0.0651  |
+| QR      | `123456789123` | 683.8472     | 0.6528  | 0.0178  | 0.0730  |
+
+#### Redis cache (warm start)
+
+| Format  | Data           | Requests/sec | Slowest | Fastest | Average |
+| ------- | -------------- | ------------ | ------- | ------- | ------- |
+| Code128 | `123456789123` | 15611.5521   | 0.0965  | 0.0006  | 0.0032  |
+| EAN13   | `123456789123` | 14985.4401   | 0.0925  | 0.0006  | 0.0033  |
+| QR      | `123456789123` | 14306.2540   | 0.1143  | 0.0005  | 0.0035  |

docker-compose.dev.yaml

@@ -0,0 +1,9 @@
+services:
+  gotenberg:
+    image: gotenberg/gotenberg:8
+    ports:
+      - "3001:3000"
+  redis:
+    image: docker.dragonflydb.io/dragonflydb/dragonfly
+    ports:
+      - "6379:6379"

docker-compose.yaml

@@ -0,0 +1,15 @@
+services:
+  document-server:
+    build: .
+    ports:
+      - "3000:3000"
+    volumes:
+      - ./docker.env:/.env
+  gotenberg:
+    image: gotenberg/gotenberg:8
+    ports:
+      - "3001:3000"
+  redis:
+    image: docker.dragonflydb.io/dragonflydb/dragonfly
+    ports:
+      - "6379:6379"

docker.env

@@ -0,0 +1,18 @@
+PORT=3000
+PRODUCION=false
+APIKEY=lfk
+EVENTNAME=Lauf für Kaya! 2025
+CURRENCYSYMBOL=€
+GOTENBERG_BASEURL=http://gotenberg:3000
+REDIS_ADDR=redis:6379
+
+CARD_SUBTITLE=Kaya ist cool
+CARD_BARCODEFORMAT=ean13
+# CARD_BARCODEPREFIX=
+
+SPONSOING_RECEIPTMINIMUM=10
+SPONSORING_DISCLAIMER=Kaya ist cool, aber pass auf, dass du nicht zu viel Geld sammelst!
+SPONSORING_BARCODEFORMAT=code128
+# SPONSORING_BARCODEPREFIX=
+
+CERTIFICATE_FOOTER=Kaya ist cool, danke für deine Unterstützung!

docs/docs.go

@@ -0,0 +1,437 @@
+// Package docs Code generated by swaggo/swag. DO NOT EDIT
+package docs
+
+import "github.com/swaggo/swag"
+
+const docTemplate = `{
+    "schemes": {{ marshal .Schemes }},
+    "swagger": "2.0",
+    "info": {
+        "description": "{{escape .Description}}",
+        "title": "{{.Title}}",
+        "termsOfService": "https://lauf-fuer-kaya.de/datenschutz",
+        "contact": {
+            "name": "ODIT.Services UG (haftungsbeschränkt)",
+            "url": "https://odit.services",
+            "email": "info@odit.services"
+        },
+        "license": {
+            "name": "CC BY-NC-SA 4.0"
+        },
+        "version": "{{.Version}}"
+    },
+    "host": "{{.Host}}",
+    "basePath": "{{.BasePath}}",
+    "paths": {
+        "/v1/barcodes/{type}/{content}": {
+            "get": {
+                "description": "Generate barcodes based on the provided data",
+                "produces": [
+                    "image/png"
+                ],
+                "tags": [
+                    "barcodes"
+                ],
+                "summary": "Generate barcodes",
+                "parameters": [
+                    {
+                        "enum": [
+                            "ean13",
+                            "code128"
+                        ],
+                        "type": "string",
+                        "description": "Barcode type",
+                        "name": "type",
+                        "in": "path",
+                        "required": true
+                    },
+                    {
+                        "minLength": 1,
+                        "type": "string",
+                        "description": "Barcode content",
+                        "name": "content",
+                        "in": "path",
+                        "required": true
+                    },
+                    {
+                        "maximum": 10000,
+                        "minimum": 1,
+                        "type": "integer",
+                        "default": 1000,
+                        "description": "Barcode width",
+                        "name": "width",
+                        "in": "query"
+                    },
+                    {
+                        "maximum": 10000,
+                        "minimum": 1,
+                        "type": "integer",
+                        "default": 1000,
+                        "description": "Barcode height",
+                        "name": "height",
+                        "in": "query"
+                    },
+                    {
+                        "maximum": 100,
+                        "minimum": 0,
+                        "type": "integer",
+                        "default": 10,
+                        "description": "Padding around the barcode (included in image size)",
+                        "name": "padding",
+                        "in": "query"
+                    }
+                ],
+                "responses": {}
+            }
+        },
+        "/v1/pdfs/cards": {
+            "post": {
+                "security": [
+                    {
+                        "ApiKeyAuth": []
+                    }
+                ],
+                "description": "Generate cards based on the provided data",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/pdf"
+                ],
+                "tags": [
+                    "pdfs"
+                ],
+                "summary": "Generate runner cards",
+                "parameters": [
+                    {
+                        "description": "Card data",
+                        "name": "data",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/models.CardRequest"
+                        }
+                    }
+                ],
+                "responses": {}
+            }
+        },
+        "/v1/pdfs/certificates": {
+            "post": {
+                "security": [
+                    {
+                        "ApiKeyAuth": []
+                    }
+                ],
+                "description": "Generate certificates based on the provided data",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/pdf"
+                ],
+                "tags": [
+                    "pdfs"
+                ],
+                "summary": "Generate runner certificates",
+                "parameters": [
+                    {
+                        "description": "Certificate data",
+                        "name": "data",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/models.CertificateRequest"
+                        }
+                    }
+                ],
+                "responses": {}
+            }
+        },
+        "/v1/pdfs/contracts": {
+            "post": {
+                "security": [
+                    {
+                        "ApiKeyAuth": []
+                    }
+                ],
+                "description": "Generate a contract based on the provided data",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/pdf"
+                ],
+                "tags": [
+                    "pdfs"
+                ],
+                "summary": "Generate a contract",
+                "parameters": [
+                    {
+                        "description": "Contract data",
+                        "name": "data",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/models.ContractRequest"
+                        }
+                    }
+                ],
+                "responses": {}
+            }
+        }
+    },
+    "definitions": {
+        "models.Card": {
+            "type": "object",
+            "required": [
+                "code",
+                "id",
+                "runner"
+            ],
+            "properties": {
+                "code": {
+                    "type": "string"
+                },
+                "enabled": {
+                    "type": "boolean",
+                    "default": true
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "runner": {
+                    "$ref": "#/definitions/models.Runner"
+                }
+            }
+        },
+        "models.CardRequest": {
+            "type": "object",
+            "required": [
+                "cards",
+                "locale"
+            ],
+            "properties": {
+                "cards": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.Card"
+                    }
+                },
+                "locale": {
+                    "type": "string",
+                    "enum": [
+                        "en",
+                        "de"
+                    ]
+                }
+            }
+        },
+        "models.CertificateRequest": {
+            "type": "object",
+            "required": [
+                "locale",
+                "runners"
+            ],
+            "properties": {
+                "locale": {
+                    "type": "string",
+                    "enum": [
+                        "en",
+                        "de"
+                    ]
+                },
+                "runners": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.RunnerWithDonations"
+                    }
+                }
+            }
+        },
+        "models.ContractRequest": {
+            "type": "object",
+            "required": [
+                "locale",
+                "runners"
+            ],
+            "properties": {
+                "locale": {
+                    "type": "string",
+                    "enum": [
+                        "en",
+                        "de"
+                    ]
+                },
+                "runners": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.Runner"
+                    }
+                }
+            }
+        },
+        "models.DistanceDonation": {
+            "type": "object",
+            "required": [
+                "amount_per_distance",
+                "donor",
+                "id"
+            ],
+            "properties": {
+                "amount": {
+                    "type": "integer"
+                },
+                "amount_per_distance": {
+                    "type": "integer"
+                },
+                "donor": {
+                    "$ref": "#/definitions/models.Donor"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "paid_amount": {
+                    "type": "integer"
+                }
+            }
+        },
+        "models.Donor": {
+            "type": "object",
+            "required": [
+                "first_name",
+                "id",
+                "last_name"
+            ],
+            "properties": {
+                "first_name": {
+                    "type": "string"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                }
+            }
+        },
+        "models.Group": {
+            "type": "object",
+            "required": [
+                "name"
+            ],
+            "properties": {
+                "name": {
+                    "type": "string"
+                },
+                "parent_group": {
+                    "type": "object",
+                    "required": [
+                        "name"
+                    ],
+                    "properties": {
+                        "name": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "models.Runner": {
+            "type": "object",
+            "required": [
+                "first_name",
+                "group",
+                "id",
+                "last_name"
+            ],
+            "properties": {
+                "first_name": {
+                    "type": "string"
+                },
+                "group": {
+                    "$ref": "#/definitions/models.Group"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                }
+            }
+        },
+        "models.RunnerWithDonations": {
+            "type": "object",
+            "required": [
+                "distance",
+                "first_name",
+                "group",
+                "id",
+                "last_name"
+            ],
+            "properties": {
+                "distance": {
+                    "type": "integer"
+                },
+                "distance_donations": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.DistanceDonation"
+                    }
+                },
+                "first_name": {
+                    "type": "string"
+                },
+                "group": {
+                    "$ref": "#/definitions/models.Group"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                },
+                "total_donations": {
+                    "type": "integer"
+                },
+                "total_per_distance": {
+                    "type": "integer"
+                }
+            }
+        }
+    },
+    "securityDefinitions": {
+        "ApiKeyAuth": {
+            "type": "apiKey",
+            "name": "key",
+            "in": "query"
+        }
+    }
+}`
+
+// SwaggerInfo holds exported Swagger Info so clients can modify it
+var SwaggerInfo = &swag.Spec{
+	Version:          "",
+	Host:             "",
+	BasePath:         "",
+	Schemes:          []string{},
+	Title:            "LfK Document Server API",
+	Description:      "This is the API documentation for the LfK Document Server - a tool for pdf generation.",
+	InfoInstanceName: "swagger",
+	SwaggerTemplate:  docTemplate,
+	LeftDelim:        "{{",
+	RightDelim:       "}}",
+}
+
+func init() {
+	swag.Register(SwaggerInfo.InstanceName(), SwaggerInfo)
+}

docs/swagger.json

@@ -0,0 +1,410 @@
+{
+    "swagger": "2.0",
+    "info": {
+        "description": "This is the API documentation for the LfK Document Server - a tool for pdf generation.",
+        "title": "LfK Document Server API",
+        "termsOfService": "https://lauf-fuer-kaya.de/datenschutz",
+        "contact": {
+            "name": "ODIT.Services UG (haftungsbeschränkt)",
+            "url": "https://odit.services",
+            "email": "info@odit.services"
+        },
+        "license": {
+            "name": "CC BY-NC-SA 4.0"
+        }
+    },
+    "paths": {
+        "/v1/barcodes/{type}/{content}": {
+            "get": {
+                "description": "Generate barcodes based on the provided data",
+                "produces": [
+                    "image/png"
+                ],
+                "tags": [
+                    "barcodes"
+                ],
+                "summary": "Generate barcodes",
+                "parameters": [
+                    {
+                        "enum": [
+                            "ean13",
+                            "code128"
+                        ],
+                        "type": "string",
+                        "description": "Barcode type",
+                        "name": "type",
+                        "in": "path",
+                        "required": true
+                    },
+                    {
+                        "minLength": 1,
+                        "type": "string",
+                        "description": "Barcode content",
+                        "name": "content",
+                        "in": "path",
+                        "required": true
+                    },
+                    {
+                        "maximum": 10000,
+                        "minimum": 1,
+                        "type": "integer",
+                        "default": 1000,
+                        "description": "Barcode width",
+                        "name": "width",
+                        "in": "query"
+                    },
+                    {
+                        "maximum": 10000,
+                        "minimum": 1,
+                        "type": "integer",
+                        "default": 1000,
+                        "description": "Barcode height",
+                        "name": "height",
+                        "in": "query"
+                    },
+                    {
+                        "maximum": 100,
+                        "minimum": 0,
+                        "type": "integer",
+                        "default": 10,
+                        "description": "Padding around the barcode (included in image size)",
+                        "name": "padding",
+                        "in": "query"
+                    }
+                ],
+                "responses": {}
+            }
+        },
+        "/v1/pdfs/cards": {
+            "post": {
+                "security": [
+                    {
+                        "ApiKeyAuth": []
+                    }
+                ],
+                "description": "Generate cards based on the provided data",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/pdf"
+                ],
+                "tags": [
+                    "pdfs"
+                ],
+                "summary": "Generate runner cards",
+                "parameters": [
+                    {
+                        "description": "Card data",
+                        "name": "data",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/models.CardRequest"
+                        }
+                    }
+                ],
+                "responses": {}
+            }
+        },
+        "/v1/pdfs/certificates": {
+            "post": {
+                "security": [
+                    {
+                        "ApiKeyAuth": []
+                    }
+                ],
+                "description": "Generate certificates based on the provided data",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/pdf"
+                ],
+                "tags": [
+                    "pdfs"
+                ],
+                "summary": "Generate runner certificates",
+                "parameters": [
+                    {
+                        "description": "Certificate data",
+                        "name": "data",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/models.CertificateRequest"
+                        }
+                    }
+                ],
+                "responses": {}
+            }
+        },
+        "/v1/pdfs/contracts": {
+            "post": {
+                "security": [
+                    {
+                        "ApiKeyAuth": []
+                    }
+                ],
+                "description": "Generate a contract based on the provided data",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/pdf"
+                ],
+                "tags": [
+                    "pdfs"
+                ],
+                "summary": "Generate a contract",
+                "parameters": [
+                    {
+                        "description": "Contract data",
+                        "name": "data",
+                        "in": "body",
+                        "required": true,
+                        "schema": {
+                            "$ref": "#/definitions/models.ContractRequest"
+                        }
+                    }
+                ],
+                "responses": {}
+            }
+        }
+    },
+    "definitions": {
+        "models.Card": {
+            "type": "object",
+            "required": [
+                "code",
+                "id",
+                "runner"
+            ],
+            "properties": {
+                "code": {
+                    "type": "string"
+                },
+                "enabled": {
+                    "type": "boolean",
+                    "default": true
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "runner": {
+                    "$ref": "#/definitions/models.Runner"
+                }
+            }
+        },
+        "models.CardRequest": {
+            "type": "object",
+            "required": [
+                "cards",
+                "locale"
+            ],
+            "properties": {
+                "cards": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.Card"
+                    }
+                },
+                "locale": {
+                    "type": "string",
+                    "enum": [
+                        "en",
+                        "de"
+                    ]
+                }
+            }
+        },
+        "models.CertificateRequest": {
+            "type": "object",
+            "required": [
+                "locale",
+                "runners"
+            ],
+            "properties": {
+                "locale": {
+                    "type": "string",
+                    "enum": [
+                        "en",
+                        "de"
+                    ]
+                },
+                "runners": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.RunnerWithDonations"
+                    }
+                }
+            }
+        },
+        "models.ContractRequest": {
+            "type": "object",
+            "required": [
+                "locale",
+                "runners"
+            ],
+            "properties": {
+                "locale": {
+                    "type": "string",
+                    "enum": [
+                        "en",
+                        "de"
+                    ]
+                },
+                "runners": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.Runner"
+                    }
+                }
+            }
+        },
+        "models.DistanceDonation": {
+            "type": "object",
+            "required": [
+                "amount_per_distance",
+                "donor",
+                "id"
+            ],
+            "properties": {
+                "amount": {
+                    "type": "integer"
+                },
+                "amount_per_distance": {
+                    "type": "integer"
+                },
+                "donor": {
+                    "$ref": "#/definitions/models.Donor"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "paid_amount": {
+                    "type": "integer"
+                }
+            }
+        },
+        "models.Donor": {
+            "type": "object",
+            "required": [
+                "first_name",
+                "id",
+                "last_name"
+            ],
+            "properties": {
+                "first_name": {
+                    "type": "string"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                }
+            }
+        },
+        "models.Group": {
+            "type": "object",
+            "required": [
+                "name"
+            ],
+            "properties": {
+                "name": {
+                    "type": "string"
+                },
+                "parent_group": {
+                    "type": "object",
+                    "required": [
+                        "name"
+                    ],
+                    "properties": {
+                        "name": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "models.Runner": {
+            "type": "object",
+            "required": [
+                "first_name",
+                "group",
+                "id",
+                "last_name"
+            ],
+            "properties": {
+                "first_name": {
+                    "type": "string"
+                },
+                "group": {
+                    "$ref": "#/definitions/models.Group"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                }
+            }
+        },
+        "models.RunnerWithDonations": {
+            "type": "object",
+            "required": [
+                "distance",
+                "first_name",
+                "group",
+                "id",
+                "last_name"
+            ],
+            "properties": {
+                "distance": {
+                    "type": "integer"
+                },
+                "distance_donations": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/models.DistanceDonation"
+                    }
+                },
+                "first_name": {
+                    "type": "string"
+                },
+                "group": {
+                    "$ref": "#/definitions/models.Group"
+                },
+                "id": {
+                    "type": "integer"
+                },
+                "last_name": {
+                    "type": "string"
+                },
+                "middle_name": {
+                    "type": "string"
+                },
+                "total_donations": {
+                    "type": "integer"
+                },
+                "total_per_distance": {
+                    "type": "integer"
+                }
+            }
+        }
+    },
+    "securityDefinitions": {
+        "ApiKeyAuth": {
+            "type": "apiKey",
+            "name": "key",
+            "in": "query"
+        }
+    }
+}

docs/swagger.yaml

@@ -0,0 +1,278 @@
+definitions:
+  models.Card:
+    properties:
+      code:
+        type: string
+      enabled:
+        default: true
+        type: boolean
+      id:
+        type: integer
+      runner:
+        $ref: '#/definitions/models.Runner'
+    required:
+    - code
+    - id
+    - runner
+    type: object
+  models.CardRequest:
+    properties:
+      cards:
+        items:
+          $ref: '#/definitions/models.Card'
+        type: array
+      locale:
+        enum:
+        - en
+        - de
+        type: string
+    required:
+    - cards
+    - locale
+    type: object
+  models.CertificateRequest:
+    properties:
+      locale:
+        enum:
+        - en
+        - de
+        type: string
+      runners:
+        items:
+          $ref: '#/definitions/models.RunnerWithDonations'
+        type: array
+    required:
+    - locale
+    - runners
+    type: object
+  models.ContractRequest:
+    properties:
+      locale:
+        enum:
+        - en
+        - de
+        type: string
+      runners:
+        items:
+          $ref: '#/definitions/models.Runner'
+        type: array
+    required:
+    - locale
+    - runners
+    type: object
+  models.DistanceDonation:
+    properties:
+      amount:
+        type: integer
+      amount_per_distance:
+        type: integer
+      donor:
+        $ref: '#/definitions/models.Donor'
+      id:
+        type: integer
+      paid_amount:
+        type: integer
+    required:
+    - amount_per_distance
+    - donor
+    - id
+    type: object
+  models.Donor:
+    properties:
+      first_name:
+        type: string
+      id:
+        type: integer
+      last_name:
+        type: string
+      middle_name:
+        type: string
+    required:
+    - first_name
+    - id
+    - last_name
+    type: object
+  models.Group:
+    properties:
+      name:
+        type: string
+      parent_group:
+        properties:
+          name:
+            type: string
+        required:
+        - name
+        type: object
+    required:
+    - name
+    type: object
+  models.Runner:
+    properties:
+      first_name:
+        type: string
+      group:
+        $ref: '#/definitions/models.Group'
+      id:
+        type: integer
+      last_name:
+        type: string
+      middle_name:
+        type: string
+    required:
+    - first_name
+    - group
+    - id
+    - last_name
+    type: object
+  models.RunnerWithDonations:
+    properties:
+      distance:
+        type: integer
+      distance_donations:
+        items:
+          $ref: '#/definitions/models.DistanceDonation'
+        type: array
+      first_name:
+        type: string
+      group:
+        $ref: '#/definitions/models.Group'
+      id:
+        type: integer
+      last_name:
+        type: string
+      middle_name:
+        type: string
+      total_donations:
+        type: integer
+      total_per_distance:
+        type: integer
+    required:
+    - distance
+    - first_name
+    - group
+    - id
+    - last_name
+    type: object
+info:
+  contact:
+    email: info@odit.services
+    name: ODIT.Services UG (haftungsbeschränkt)
+    url: https://odit.services
+  description: This is the API documentation for the LfK Document Server - a tool
+    for pdf generation.
+  license:
+    name: CC BY-NC-SA 4.0
+  termsOfService: https://lauf-fuer-kaya.de/datenschutz
+  title: LfK Document Server API
+paths:
+  /v1/barcodes/{type}/{content}:
+    get:
+      description: Generate barcodes based on the provided data
+      parameters:
+      - description: Barcode type
+        enum:
+        - ean13
+        - code128
+        in: path
+        name: type
+        required: true
+        type: string
+      - description: Barcode content
+        in: path
+        minLength: 1
+        name: content
+        required: true
+        type: string
+      - default: 1000
+        description: Barcode width
+        in: query
+        maximum: 10000
+        minimum: 1
+        name: width
+        type: integer
+      - default: 1000
+        description: Barcode height
+        in: query
+        maximum: 10000
+        minimum: 1
+        name: height
+        type: integer
+      - default: 10
+        description: Padding around the barcode (included in image size)
+        in: query
+        maximum: 100
+        minimum: 0
+        name: padding
+        type: integer
+      produces:
+      - image/png
+      responses: {}
+      summary: Generate barcodes
+      tags:
+      - barcodes
+  /v1/pdfs/cards:
+    post:
+      consumes:
+      - application/json
+      description: Generate cards based on the provided data
+      parameters:
+      - description: Card data
+        in: body
+        name: data
+        required: true
+        schema:
+          $ref: '#/definitions/models.CardRequest'
+      produces:
+      - application/pdf
+      responses: {}
+      security:
+      - ApiKeyAuth: []
+      summary: Generate runner cards
+      tags:
+      - pdfs
+  /v1/pdfs/certificates:
+    post:
+      consumes:
+      - application/json
+      description: Generate certificates based on the provided data
+      parameters:
+      - description: Certificate data
+        in: body
+        name: data
+        required: true
+        schema:
+          $ref: '#/definitions/models.CertificateRequest'
+      produces:
+      - application/pdf
+      responses: {}
+      security:
+      - ApiKeyAuth: []
+      summary: Generate runner certificates
+      tags:
+      - pdfs
+  /v1/pdfs/contracts:
+    post:
+      consumes:
+      - application/json
+      description: Generate a contract based on the provided data
+      parameters:
+      - description: Contract data
+        in: body
+        name: data
+        required: true
+        schema:
+          $ref: '#/definitions/models.ContractRequest'
+      produces:
+      - application/pdf
+      responses: {}
+      security:
+      - ApiKeyAuth: []
+      summary: Generate a contract
+      tags:
+      - pdfs
+securityDefinitions:
+  ApiKeyAuth:
+    in: query
+    name: key
+    type: apiKey
+swagger: "2.0"

go.mod

@@ -0,0 +1,61 @@
+module git.odit.services/lfk/document-server
+
+go 1.23.2
+
+toolchain go1.23.3
+
+require (
+	github.com/gofiber/fiber/v2 v2.52.5
+	github.com/gofiber/swagger v1.1.0
+	github.com/swaggo/swag v1.16.4
+)
+
+require (
+	github.com/KyleBanks/depth v1.2.1 // indirect
+	github.com/andybalholm/brotli v1.1.1 // indirect
+	github.com/boombuler/barcode v1.0.2 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/go-openapi/jsonpointer v0.21.0 // indirect
+	github.com/go-openapi/jsonreference v0.21.0 // indirect
+	github.com/go-openapi/spec v0.21.0 // indirect
+	github.com/go-openapi/swag v0.23.0 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/mailru/easyjson v0.7.7 // indirect
+	github.com/makiuchi-d/gozxing v0.1.1 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-runewidth v0.0.16 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/oxplot/papersizes v0.0.0-20181201065918-90a3a5ae1915 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/redis/go-redis/v9 v9.7.0 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/sagikazarmark/locafero v0.4.0 // indirect
+	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
+	github.com/sourcegraph/conc v0.3.0 // indirect
+	github.com/spf13/afero v1.11.0 // indirect
+	github.com/spf13/cast v1.6.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/spf13/viper v1.19.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	github.com/swaggo/files/v2 v2.0.1 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/valyala/fasthttp v1.57.0 // indirect
+	github.com/valyala/tcplisten v1.0.0 // indirect
+	go.uber.org/atomic v1.9.0 // indirect
+	go.uber.org/multierr v1.10.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
+	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
+	golang.org/x/sys v0.27.0 // indirect
+	golang.org/x/text v0.19.0 // indirect
+	golang.org/x/tools v0.27.0 // indirect
+	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,138 @@
+github.com/KyleBanks/depth v1.2.1 h1:5h8fQADFrWtarTdtDudMmGsC7GPbOAu6RVB3ffsVFHc=
+github.com/KyleBanks/depth v1.2.1/go.mod h1:jzSb9d0L43HxTQfT+oSA1EEp2q+ne2uh6XgeJcm8brE=
+github.com/andybalholm/brotli v1.1.1 h1:PR2pgnyFznKEugtsUo0xLdDop5SKXd5Qf5ysW+7XdTA=
+github.com/andybalholm/brotli v1.1.1/go.mod h1:05ib4cKhjx3OQYUY22hTVd34Bc8upXjOLL2rKwwZBoA=
+github.com/boombuler/barcode v1.0.2 h1:79yrbttoZrLGkL/oOI8hBrUKucwOL0oOjUgEguGMcJ4=
+github.com/boombuler/barcode v1.0.2/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
+github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
+github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
+github.com/go-openapi/jsonpointer v0.21.0 h1:YgdVicSA9vH5RiHs9TZW5oyafXZFc6+2Vc1rr/O9oNQ=
+github.com/go-openapi/jsonpointer v0.21.0/go.mod h1:IUyH9l/+uyhIYQ/PXVA41Rexl+kOkAPDdXEYns6fzUY=
+github.com/go-openapi/jsonreference v0.21.0 h1:Rs+Y7hSXT83Jacb7kFyjn4ijOuVGSvOdF2+tg1TRrwQ=
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+github.com/gofiber/fiber/v2 v2.52.5 h1:tWoP1MJQjGEe4GB5TUGOi7P2E0ZMMRx5ZTG4rT+yGMo=
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+github.com/gofiber/swagger v1.1.0 h1:ff3rg1fB+Rp5JN/N8jfxTiZtMKe/9tB9QDc79fPiJKQ=
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handlers/barcode.go

@@ -0,0 +1,73 @@
+package handlers
+
+import (
+	"strconv"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+// GenerateBarcode godoc
+//
+//	@Summary		Generate barcodes
+//	@Description	Generate barcodes based on the provided data
+//	@Tags			barcodes
+//	@Param			type	path	string	true	"Barcode type"											Enums(ean13, code128)
+//	@Param			content	path	string	true	"Barcode content"										MinLength(1)
+//	@Param			width	query	int		false	"Barcode width"											Minimum(1)	Maximum(10000)	default(1000)
+//	@Param			height	query	int		false	"Barcode height"										Minimum(1)	Maximum(10000)	default(1000)
+//	@Param			padding	query	int		false	"Padding around the barcode (included in image size)"	Minimum(0)	Maximum(100)	default(10)
+//	@Produce		image/png
+//	@Router			/v1/barcodes/{type}/{content} [get]
+func (h *DefaultHandler) GenerateBarcode(c *fiber.Ctx) error {
+
+	logger := h.Logger.Named("GenerateBarcode")
+
+	// Get the type and content from the URL
+	barcodeType := c.Params("type")
+	barcodeContent := c.Params("content")
+
+	// Get the width and height from the query parameters
+	widthStr := c.Query("width", "1000")
+	heightStr := c.Query("height", "1000")
+	paddingStr := c.Query("padding", "10")
+
+	// Convert width and height to integers
+	width, err := strconv.Atoi(widthStr)
+	if err != nil {
+		logger.Errorw("Invalid width parameter", "width", widthStr, "error", err)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Invalid width parameter",
+		})
+	}
+
+	height, err := strconv.Atoi(heightStr)
+	if err != nil {
+		logger.Errorw("Invalid height parameter", "height", heightStr, "error", err)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Invalid height parameter",
+		})
+	}
+
+	padding, err := strconv.Atoi(paddingStr)
+	if err != nil {
+		logger.Errorw("Invalid padding parameter", "padding", paddingStr, "error", err)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Invalid padding parameter",
+		})
+	}
+	logger = logger.With("type", barcodeType, "content", barcodeContent, "width", width, "height", height, "padding", padding)
+
+	// Generate the barcode
+	logger.Info("Generating barcode")
+	barcode, err := h.BarcodeService.GenerateBarcode(barcodeType, barcodeContent, width, height, padding)
+	if err != nil {
+		logger.Errorw("Failed to generate barcode", "error", err)
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	logger.Info("Barcode generated")
+
+	c.Set(fiber.HeaderContentType, "image/png")
+	return c.Send(barcode.Bytes())
+}

handlers/card.go

@@ -0,0 +1,123 @@
+package handlers
+
+import (
+	"slices"
+
+	"git.odit.services/lfk/document-server/models"
+	"github.com/gofiber/fiber/v2"
+)
+
+// GenerateCard godoc
+//
+//	@Summary		Generate runner cards
+//	@Description	Generate cards based on the provided data
+//	@Tags			pdfs
+//	@Accept			json
+//	@Param			data	body	models.CardRequest	true	"Card data"
+//	@Produce		application/pdf
+//	@Security		ApiKeyAuth
+//	@Router			/v1/pdfs/cards [post]
+func (h *DefaultHandler) GenerateCard(c *fiber.Ctx) error {
+
+	logger := h.Logger.Named("GenerateCard")
+
+	cardRequest := new(models.CardRequest)
+	if err := c.BodyParser(cardRequest); err != nil {
+		logger.Errorw("Invalid request", "error", err)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	if !slices.Contains([]string{"en", "de"}, cardRequest.Locale) {
+		logger.Errorw("Invalid locale", "locale", cardRequest.Locale)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Invalid locale",
+		})
+	}
+
+	logger = logger.With("locale", cardRequest.Locale)
+
+	templateString, err := h.StaticService.GetTemplate(cardRequest.Locale, "card")
+	if err != nil {
+		logger.Errorw("Template not found", "error", err)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Template not found",
+		})
+	}
+	template, err := h.Templater.StringToTemplate(templateString)
+	if err != nil {
+		logger.Errorw("Error parsing template", "error", err)
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+
+	genConfig := &models.CardTemplateOptions{
+		CardSegments:  splitCardSegments(cardRequest.Cards),
+		EventName:     h.Config.EventName,
+		CardSubtitle:  h.Config.CardSubtitle,
+		BarcodeFormat: h.Config.CardBarcodeFormat,
+		BarcodePrefix: h.Config.CardBarcodePrefix,
+	}
+
+	logger.Info("Generating card html")
+	result, err := h.Templater.Execute(template, genConfig)
+	if err != nil {
+		logger.Errorw("Error executing template", "error", err)
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	logger.Info("Generated card html")
+	c.Set(fiber.HeaderContentType, "text/html")
+
+	logger.Info("Converting html to pdf")
+	pdf, err := h.Converter.ToPdf(result, "a4", false)
+	if err != nil {
+		logger.Errorw("Error converting html to pdf", "error", err)
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	logger.Info("Converted html to pdf")
+
+	c.Set(fiber.HeaderContentType, "application/pdf")
+	c.Set(fiber.HeaderContentDisposition, "attachment; filename=runner-cards.pdf")
+	return c.Send(pdf)
+}
+
+func invertCardArrayItemPairs(cards []models.Card) []models.Card {
+	inverted := make([]models.Card, 0)
+	for i := 0; i < len(cards); i += 2 {
+		if i+1 < len(cards) {
+			inverted = append(inverted, cards[i+1])
+		}
+		inverted = append(inverted, cards[i])
+	}
+	return inverted
+}
+
+func splitCardSegments(cards []models.Card) []models.CardTemplateSegment {
+	cardSegments := make([]models.CardTemplateSegment, 0)
+	const currentCards = 0
+	for i := 0; i < len(cards); i += 10 {
+		segmentLength := 10
+		if len(cards)-i < 10 {
+			segmentLength = len(cards) - i
+		}
+		segment := cards[i : i+segmentLength]
+		if segmentLength%2 != 0 {
+			segment = append(segment, models.Card{
+				ID:      0,
+				Enabled: false,
+				Runner:  models.Runner{},
+				Code:    "",
+			})
+		}
+		cardSegments = append(cardSegments, models.CardTemplateSegment{
+			Cards:        segment,
+			CardsSwapped: invertCardArrayItemPairs(segment),
+		})
+	}
+	return cardSegments
+}

handlers/certificate.go

@@ -0,0 +1,95 @@
+package handlers
+
+import (
+	"slices"
+
+	"git.odit.services/lfk/document-server/models"
+	"github.com/gofiber/fiber/v2"
+)
+
+// GenerateCertificate godoc
+//
+//	@Summary		Generate runner certificates
+//	@Description	Generate certificates based on the provided data
+//	@Tags			pdfs
+//	@Accept			json
+//	@Param			data	body	models.CertificateRequest	true	"Certificate data"
+//	@Produce		application/pdf
+//	@Security		ApiKeyAuth
+//	@Router			/v1/pdfs/certificates [post]
+func (h *DefaultHandler) GenerateCertificate(c *fiber.Ctx) error {
+
+	logger := h.Logger.Named("GenerateCertificate")
+
+	certificateRequest := new(models.CertificateRequest)
+	if err := c.BodyParser(certificateRequest); err != nil {
+		logger.Errorw("Invalid request", "error", err)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	if !slices.Contains([]string{"en", "de"}, certificateRequest.Locale) {
+		logger.Errorw("Invalid locale", "locale", certificateRequest.Locale)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Invalid locale",
+		})
+	}
+
+	logger = logger.With("locale", certificateRequest.Locale)
+
+	templateString, err := h.StaticService.GetTemplate(certificateRequest.Locale, "certificate")
+	if err != nil {
+		logger.Errorw("Template not found", "error", err)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Template not found",
+		})
+	}
+	template, err := h.Templater.StringToTemplate(templateString)
+	if err != nil {
+		logger.Errorw("Error parsing template", "error", err)
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+
+	genConfig := &models.CertificateTemplateOptions{
+		Runners:        addUpRunnerDonations(certificateRequest.Runners),
+		EventName:      h.Config.EventName,
+		Footer:         h.Config.CertificateFooter,
+		CurrencySymbol: h.Config.CurrencySymbol,
+		Locale:         certificateRequest.Locale,
+	}
+
+	logger.Info("Generating certificate html")
+	result, err := h.Templater.Execute(template, genConfig)
+	if err != nil {
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	logger.Info("Generated card html")
+	c.Set(fiber.HeaderContentType, "text/html")
+
+	logger.Info("Converting html to pdf")
+	pdf, err := h.Converter.ToPdf(result, "a4", false)
+	if err != nil {
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	logger.Info("Converted html to pdf")
+
+	c.Set(fiber.HeaderContentType, "application/pdf")
+	c.Set(fiber.HeaderContentDisposition, "attachment; filename=certificate.pdf")
+	return c.Send(pdf)
+}
+
+func addUpRunnerDonations(runners []models.RunnerWithDonations) []models.RunnerWithDonations {
+	for i := 0; i < len(runners); i++ {
+		for j := 0; j < len(runners[i].DistanceDonations); j++ {
+			runners[i].TotalDonations += runners[i].DistanceDonations[j].Amount
+			runners[i].TotalPerDistance += runners[i].DistanceDonations[j].AmountPerDistance
+		}
+	}
+	return runners
+}

handlers/contract.go

@@ -0,0 +1,96 @@
+package handlers
+
+import (
+	"slices"
+
+	"git.odit.services/lfk/document-server/models"
+	"github.com/gofiber/fiber/v2"
+)
+
+// GenerateContract godoc
+//
+//	@Summary		Generate a contract
+//	@Description	Generate a contract based on the provided data
+//	@Tags			pdfs
+//	@Accept			json
+//	@Param			data	body	models.ContractRequest	true	"Contract data"
+//	@Produce		application/pdf
+//	@Security		ApiKeyAuth
+//	@Router			/v1/pdfs/contracts [post]
+func (h *DefaultHandler) GenerateContract(c *fiber.Ctx) error {
+
+	logger := h.Logger.Named("GenerateContract")
+
+	contract := new(models.ContractRequest)
+	if err := c.BodyParser(contract); err != nil {
+		logger.Errorw("Invalid request", "error", err)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	if !slices.Contains([]string{"en", "de"}, contract.Locale) {
+		logger.Errorw("Invalid locale", "locale", contract.Locale)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Invalid locale",
+		})
+	}
+
+	logger = logger.With("locale", contract.Locale)
+
+	templateString, err := h.StaticService.GetTemplate(contract.Locale, "contract")
+	if err != nil {
+		logger.Errorw("Template not found", "error", err)
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "Template not found",
+		})
+	}
+	template, err := h.Templater.StringToTemplate(templateString)
+	if err != nil {
+		logger.Errorw("Error parsing template", "error", err)
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+
+	genConfig := &models.ContractTemplateOptions{
+		Runners:              repeatRunnerArrayItems(contract.Runners, 2),
+		CurrencySymbol:       h.Config.CurrencySymbol,
+		Disclaimer:           h.Config.SponosringDisclaimer,
+		ReceiptMinimumAmount: h.Config.SponsoringReceiptMinimum,
+		EventName:            h.Config.EventName,
+		BarcodeFormat:        h.Config.SponsoringBarcodeFormat,
+		BarcodePrefix:        h.Config.SponsoringBarcodePrefix,
+	}
+
+	logger.Info("Generating contract html")
+	result, err := h.Templater.Execute(template, genConfig)
+	if err != nil {
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	logger.Info("Generated contract html")
+
+	logger.Info("Converting html to pdf")
+	pdf, err := h.Converter.ToPdf(result, "a5", true)
+	if err != nil {
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": err.Error(),
+		})
+	}
+	logger.Info("Converted html to pdf")
+
+	c.Set(fiber.HeaderContentType, "application/pdf")
+	c.Set(fiber.HeaderContentDisposition, "attachment; filename=runner-contracts.pdf")
+	return c.Send(pdf)
+}
+
+func repeatRunnerArrayItems(runners []models.Runner, duplicates int) []models.Runner {
+	var duplicatedRunners []models.Runner
+	for _, runner := range runners {
+		for i := 0; i < duplicates; i++ {
+			duplicatedRunners = append(duplicatedRunners, runner)
+		}
+	}
+	return duplicatedRunners
+}

handlers/handlers.go

@@ -0,0 +1,24 @@
+package handlers
+
+import (
+	"git.odit.services/lfk/document-server/models"
+	"git.odit.services/lfk/document-server/services"
+	"github.com/gofiber/fiber/v2"
+	"go.uber.org/zap"
+)
+
+type Handler interface {
+	GenerateCard(*fiber.Ctx) error
+	GenerateContract(*fiber.Ctx) error
+	GenerateCertificate(*fiber.Ctx) error
+	GenerateBarcode(*fiber.Ctx) error
+}
+
+type DefaultHandler struct {
+	Config         *models.Config
+	BarcodeService services.BarcodeService
+	Templater      services.Templater
+	Converter      services.Converter
+	StaticService  services.StaticService
+	Logger         *zap.SugaredLogger
+}

handlers/util.go

@@ -0,0 +1,7 @@
+package handlers
+
+import "github.com/gofiber/fiber/v2"
+
+func (h *DefaultHandler) NotFoundHandler(c *fiber.Ctx) error {
+	return c.Status(404).SendString("Not Found")
+}

main.go

@@ -0,0 +1,194 @@
+package main
+
+import (
+	"crypto/sha256"
+	"crypto/subtle"
+	"os"
+	"strings"
+
+	"git.odit.services/lfk/document-server/docs" // Correct import path for docs
+	"git.odit.services/lfk/document-server/handlers"
+	"git.odit.services/lfk/document-server/models"
+	"git.odit.services/lfk/document-server/services"
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/cors"
+	"github.com/gofiber/fiber/v2/middleware/keyauth"
+	"github.com/gofiber/fiber/v2/middleware/requestid"
+	"github.com/gofiber/swagger"
+	"github.com/redis/go-redis/v9"
+	"github.com/spf13/viper"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+var (
+	config *models.Config
+	logger *zap.SugaredLogger
+)
+
+func validateAPIKey(c *fiber.Ctx, key string) (bool, error) {
+	hashedAPIKey := sha256.Sum256([]byte(config.APIKey))
+	hashedKey := sha256.Sum256([]byte(key))
+
+	if subtle.ConstantTimeCompare(hashedAPIKey[:], hashedKey[:]) == 1 {
+		return true, nil
+	}
+	return false, keyauth.ErrMissingOrMalformedAPIKey
+}
+
+func loadEnv() error {
+
+	viper.SetDefault("LOGLEVEL", "INFO")
+	viper.SetDefault("PRODUCION", false)
+	viper.SetDefault("PORT", "3000")
+	viper.SetDefault("APIKEY", "lfk")
+	viper.SetDefault("EVENTNAME", "Demo Event")
+	viper.SetDefault("CURRENCYSYMBOL", "€")
+	viper.SetDefault("CARD_SUBTITLE", "Runner Card")
+	viper.SetDefault("CARD_BARCODEFORMAT", "ean13")
+	viper.SetDefault("CARD_BARCODEPREFIX", "")
+	viper.SetDefault("SPONSORING_RECEIPTMINIMUM", 0)
+	viper.SetDefault("SPONSORING_DISCLAIMER", "Disclaimer")
+	viper.SetDefault("SPONSORING_BARCODEFORMAT", "code128")
+	viper.SetDefault("SPONSORING_BARCODEPREFIX", "")
+	viper.SetDefault("CERTIFICATE_FOOTER", "Footer")
+	viper.SetDefault("GOTENBERG_BASEURL", "")
+	viper.SetDefault("REDIS_ADDR", "")
+
+	// Load .env file
+	viper.SetConfigFile(".env")
+
+	// Load environment variables
+	viper.AutomaticEnv()
+	err := viper.ReadInConfig()
+	if err != nil {
+		logger.Warn("No .env file found")
+	}
+
+	// Unmarshal the config from file and env into the config struct
+	err = viper.Unmarshal(&config)
+	if err != nil {
+		return err
+	}
+
+	logger.Infow("Loaded config", "config", &config)
+
+	return nil
+}
+
+func initLogger() error {
+	logLevel := os.Getenv("LOGLEVEL")
+	if logLevel == "" {
+		logLevel = "INFO"
+	}
+
+	var zapLogLevel zapcore.Level
+	err := zapLogLevel.UnmarshalText([]byte(strings.ToLower(logLevel)))
+	if err != nil {
+		zapLogLevel = zapcore.InfoLevel
+	}
+
+	zapConfig := zap.NewProductionConfig()
+	zapConfig.Level = zap.NewAtomicLevelAt(zapLogLevel)
+	zapLogger, err := zapConfig.Build()
+	if err != nil {
+		return err
+	}
+
+	defer zapLogger.Sync()
+	logger = zapLogger.Sugar()
+
+	logger.Debug("Initialized logger")
+
+	return nil
+}
+
+// @title						LfK Document Server API
+// @description					This is the API documentation for the LfK Document Server - a tool for pdf generation.
+// @license.name				CC BY-NC-SA 4.0
+// @termsOfService				https://lauf-fuer-kaya.de/datenschutz
+// @contact.name				ODIT.Services UG (haftungsbeschränkt)
+// @contact.url					https://odit.services
+// @contact.email				info@odit.services
+// @securityDefinitions.apiKey	ApiKeyAuth
+// @in							query
+// @name						key
+func main() {
+
+	// Init the logger
+	err := initLogger()
+	if err != nil {
+		return
+	}
+
+	err = loadEnv()
+	if err != nil {
+		logger.Error(err)
+		return
+	}
+
+	var redisClient *redis.Client
+	if config.RedisAddr != "" {
+		logger.Infow("Using redis", "redisAddr", config.RedisAddr)
+		redisClient = redis.NewClient(&redis.Options{
+			Addr: config.RedisAddr,
+		})
+	}
+
+	barcodeGenerator := &services.DefaultBarcodeService{
+		RedisClient: redisClient,
+		Logger:      logger.Named("DefaultBarcodeService"),
+	}
+	staticService := &services.DefaultStaticService{
+		Cache:  make(map[string]string),
+		Logger: logger.Named("DefaultStaticService"),
+	}
+	handler := handlers.DefaultHandler{
+		Config:         config,
+		BarcodeService: barcodeGenerator,
+		StaticService:  staticService,
+		Templater: &services.DefaultTemplater{
+			BarcodeService: barcodeGenerator,
+			StaticService:  staticService,
+			Logger:         logger.Named("DefaultTemplater"),
+		},
+		Converter: &services.GotenbergConverter{
+			BaseUrl: config.GotenbergBaseUrl,
+			Logger:  logger.Named("GotenbergConverter"),
+		},
+		Logger: logger.Named("DefaultHandler"),
+	}
+	logger.Debug("Initialized services")
+
+	// Create a new Fiber instance
+	app := fiber.New(fiber.Config{
+		Prefork: config.Prod,
+	})
+
+	app.Use(cors.New())
+	app.Use(requestid.New())
+
+	// Swagger documentation route
+	app.Get("/swagger/*", swagger.HandlerDefault)
+
+	v1 := app.Group("/v1")
+
+	pdfv1 := v1.Group("/pdfs")
+	pdfv1.Use(keyauth.New(keyauth.Config{
+		KeyLookup: "query:key",
+		Validator: validateAPIKey,
+	}))
+
+	pdfv1.Post("/contracts", handler.GenerateContract)
+	pdfv1.Post("/cards", handler.GenerateCard)
+	pdfv1.Post("/certificates", handler.GenerateCertificate)
+
+	v1.Get("/barcodes/:type/:content", handler.GenerateBarcode)
+	logger.Debug("Initialized routes")
+
+	app.Use(handler.NotFoundHandler)
+	docs.SwaggerInfo.BasePath = "/"
+
+	logger.Infow("Starting server", "port", config.Port)
+	logger.Error(app.Listen("0.0.0.0:" + config.Port))
+}

models/card.go

@@ -0,0 +1,26 @@
+package models
+
+type CardRequest struct {
+	Cards  []Card `json:"cards" validate:"required"`
+	Locale string `json:"locale" enums:"en,de" validate:"required"`
+}
+
+type Card struct {
+	ID      int    `json:"id" validate:"required"`
+	Enabled bool   `json:"enabled" default:"true"`
+	Runner  Runner `json:"runner" validate:"required"`
+	Code    string `json:"code" validate:"required"`
+}
+
+type CardTemplateOptions struct {
+	CardSegments  []CardTemplateSegment `json:"card_segments"`
+	EventName     string                `json:"event_name"`
+	CardSubtitle  string                `json:"card_subtitle"`
+	BarcodeFormat string                `json:"barcode_format"`
+	BarcodePrefix string                `json:"barcode_prefix"`
+}
+
+type CardTemplateSegment struct {
+	Cards        []Card `json:"cards"`
+	CardsSwapped []Card `json:"cards_swapped"`
+}

models/certificate.go

@@ -0,0 +1,41 @@
+package models
+
+type CertificateRequest struct {
+	Runners []RunnerWithDonations `json:"runners" validate:"required"`
+	Locale  string                `json:"locale" enums:"en,de" validate:"required"`
+}
+
+type RunnerWithDonations struct {
+	ID                int                `json:"id" validate:"required"`
+	FirstName         string             `json:"first_name" validate:"required"`
+	MiddleName        string             `json:"middle_name" validate:"optional"`
+	LastName          string             `json:"last_name" validate:"required"`
+	Group             Group              `json:"group" validate:"required"`
+	Distance          int                `json:"distance" validate:"required"`
+	DistanceDonations []DistanceDonation `json:"distance_donations" validate:"optional"`
+	TotalPerDistance  int                `json:"total_per_distance" validate:"optional"`
+	TotalDonations    int                `json:"total_donations" validate:"optional"`
+}
+
+type DistanceDonation struct {
+	ID                int   `json:"id" validate:"required"`
+	Amount            int   `json:"amount"`
+	PaidAmount        int   `json:"paid_amount" validate:"optional"`
+	AmountPerDistance int   `json:"amount_per_distance" validate:"required"`
+	Donor             Donor `json:"donor" validate:"required"`
+}
+
+type Donor struct {
+	ID         int    `json:"id" validate:"required"`
+	FirstName  string `json:"first_name" validate:"required"`
+	MiddleName string `json:"middle_name" validate:"optional"`
+	LastName   string `json:"last_name" validate:"required"`
+}
+
+type CertificateTemplateOptions struct {
+	Runners        []RunnerWithDonations `json:"runners"`
+	EventName      string                `json:"event_name"`
+	Footer         string                `json:"footer"`
+	CurrencySymbol string                `json:"currency_symbol"`
+	Locale         string                `json:"locale"`
+}

models/config.go

@@ -0,0 +1,20 @@
+package models
+
+type Config struct {
+	LogLevel                 string `mapstructure:"LOGLEVEL"`
+	Prod                     bool   `mapstructure:"PRODUCION"`
+	Port                     string `mapstructure:"PORT"`
+	APIKey                   string `mapstructure:"APIKEY"`
+	EventName                string `mapstructure:"EVENTNAME"`
+	CurrencySymbol           string `mapstructure:"CURRENCYSYMBOL"`
+	CardSubtitle             string `mapstructure:"CARD_SUBTITLE"`
+	CardBarcodeFormat        string `mapstructure:"CARD_BARCODEFORMAT"`
+	CardBarcodePrefix        string `mapstructure:"CARD_BARCODEPREFIX"`
+	SponsoringReceiptMinimum string `mapstructure:"SPONSOING_RECEIPTMINIMUM"`
+	SponosringDisclaimer     string `mapstructure:"SPONSORING_DISCLAIMER"`
+	SponsoringBarcodeFormat  string `mapstructure:"SPONSORING_BARCODEFORMAT"`
+	SponsoringBarcodePrefix  string `mapstructure:"SPONSORING_BARCODEPREFIX"`
+	CertificateFooter        string `mapstructure:"CERTIFICATE_FOOTER"`
+	GotenbergBaseUrl         string `mapstructure:"GOTENBERG_BASEURL"`
+	RedisAddr                string `mapstructure:"REDIS_ADDR"`
+}

models/contract.go

@@ -0,0 +1,31 @@
+package models
+
+type ContractRequest struct {
+	Runners []Runner `json:"runners" validate:"required"`
+	Locale  string   `json:"locale" enums:"en,de" validate:"required"`
+}
+
+type Runner struct {
+	ID         int    `json:"id" validate:"required"`
+	FirstName  string `json:"first_name" validate:"required"`
+	MiddleName string `json:"middle_name" validate:"optional"`
+	LastName   string `json:"last_name" validate:"required"`
+	Group      Group  `json:"group" validate:"required"`
+}
+
+type Group struct {
+	Name        string `json:"name" validate:"required"`
+	ParentGroup struct {
+		Name string `json:"name" validate:"required"`
+	} `json:"parent_group" validate:"optional"`
+}
+
+type ContractTemplateOptions struct {
+	Runners              []Runner `json:"runners"`
+	CurrencySymbol       string   `json:"currency_symbol"`
+	Disclaimer           string   `json:"disclaimer"`
+	ReceiptMinimumAmount string   `json:"receipt_minimum_amount"`
+	EventName            string   `json:"event_name"`
+	BarcodeFormat        string   `json:"barcode_format"`
+	BarcodePrefix        string   `json:"barcode_prefix"`
+}

services/barcode.go

@@ -0,0 +1,125 @@
+package services
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"image"
+	"image/color"
+	"image/draw"
+	"image/png"
+	"slices"
+	"time"
+
+	"github.com/boombuler/barcode"
+	"github.com/boombuler/barcode/code128"
+	"github.com/boombuler/barcode/ean"
+	"github.com/boombuler/barcode/qr"
+	"github.com/redis/go-redis/v9"
+	"go.uber.org/zap"
+)
+
+type BarcodeService interface {
+	GenerateBarcode(format string, content string, width int, height int, padding int) (bytes.Buffer, error)
+	IsTypeSupported(format string) bool
+}
+
+type DefaultBarcodeService struct {
+	RedisClient *redis.Client
+	Logger      *zap.SugaredLogger
+}
+
+func (b *DefaultBarcodeService) GenerateBarcode(format string, content string, width int, height int, padding int) (bytes.Buffer, error) {
+	ctx := context.Background()
+	logger := b.Logger.Named("GenerateBarcode")
+
+	if !b.IsTypeSupported(format) {
+		logger.Errorw("Unsupported barcode type", "type", format)
+		return bytes.Buffer{}, fmt.Errorf("unsupported barcode type: %s", format)
+	}
+
+	logger = logger.With("type", format, "content", content, "width", width, "height", height, "padding", padding)
+	cacheKey := fmt.Sprintf("barcode:%s:%s:%d:%d:%d", format, content, width, height, padding)
+
+	if b.RedisClient != nil {
+		logger.Debugw("Checking cache for barcode", "key", cacheKey)
+		cachedBarcode, err := b.RedisClient.Get(ctx, cacheKey).Result()
+		if err == nil {
+			logger.Infow("Barcode found in cache", "key", cacheKey)
+			buf := bytes.Buffer{}
+			buf.Write([]byte(cachedBarcode))
+			return buf, nil
+		}
+	}
+
+	var generatedCode barcode.Barcode
+	var err error
+
+	switch format {
+	case "ean13":
+		generatedCode, err = ean.Encode(content)
+		if err != nil {
+			return bytes.Buffer{}, err
+		}
+		break
+	case "code128":
+		generatedCode, err = code128.Encode(content)
+		if err != nil {
+			return bytes.Buffer{}, err
+		}
+		break
+	case "qr":
+		generatedCode, err = qr.Encode(content, qr.M, qr.AlphaNumeric)
+		if err != nil {
+			return bytes.Buffer{}, err
+		}
+		break
+	}
+
+	// Create a white background image
+	bg := image.NewRGBA(image.Rect(0, 0, width, height))
+	white := color.RGBA{255, 255, 255, 255}
+	draw.Draw(bg, bg.Bounds(), &image.Uniform{white}, image.Point{}, draw.Src)
+	logger.Debug("Created white background")
+
+	// Calculate the new size for the barcode to fit within the padding
+	newWidth := width - 2*padding
+	newHeight := height - 2*padding
+
+	// Scale the barcode to the new size
+	scaledCode, err := barcode.Scale(generatedCode, newWidth, newHeight)
+	if err != nil {
+		logger.Errorw("Failed to scale barcode", "error", err)
+		return bytes.Buffer{}, err
+	}
+	logger.Debug("Scaled barcode")
+
+	// Draw the barcode on top of the white background with padding
+	draw.Draw(bg, scaledCode.Bounds().Add(image.Point{padding, padding}), scaledCode, image.Point{}, draw.Over)
+	logger.Debug("Drew barcode on background")
+
+	var buf bytes.Buffer
+	err = png.Encode(&buf, bg)
+	if err != nil {
+		logger.Errorw("Failed to encode barcode to PNG", "error", err)
+		return bytes.Buffer{}, err
+	}
+	logger.Debug("Encoded barcode to PNG")
+
+	if b.RedisClient != nil {
+		err = b.RedisClient.Set(ctx, cacheKey, buf.String(), 10*time.Minute).Err()
+		logger.Debugw("Cached barcode", "key", cacheKey)
+		if err != nil {
+			logger.Errorw("Failed to cache barcode", "error", err)
+			return bytes.Buffer{}, err
+		}
+	}
+	logger.Info("Generated barcode")
+
+	return buf, nil
+}
+
+func (b *DefaultBarcodeService) IsTypeSupported(format string) bool {
+	supportedTypes := []string{"ean13", "code128", "qr"}
+	return slices.Contains(supportedTypes, format)
+}

services/converter.go

@@ -0,0 +1,131 @@
+package services
+
+import (
+	"bytes"
+	"fmt"
+	"mime/multipart"
+	"net/http"
+	"strconv"
+
+	"github.com/oxplot/papersizes"
+	"go.uber.org/zap"
+)
+
+type Converter interface {
+	ToPdf(html string, pageSize string, landscape bool) ([]byte, error)
+}
+
+type GotenbergConverter struct {
+	BaseUrl string
+	Logger  *zap.SugaredLogger
+}
+
+func (g *GotenbergConverter) ToPdf(html string, pageSize string, landscape bool) ([]byte, error) {
+	logger := g.Logger.Named("ToPdf").With("page_size", pageSize, "landscape", landscape, "base_url", g.BaseUrl)
+
+	client := &http.Client{}
+	defer client.CloseIdleConnections()
+	logger.Debug("Created HTTP client")
+
+	body := &bytes.Buffer{}
+	writer := multipart.NewWriter(body)
+
+	part, err := writer.CreateFormFile("files", "index.html")
+	if err != nil {
+		logger.Errorw("Failed to create form file", "error", err)
+		return nil, err
+	}
+
+	_, err = part.Write([]byte(html))
+	if err != nil {
+		logger.Errorw("Failed to write to form file", "error", err)
+		return nil, err
+	}
+
+	size := papersizes.FromName(pageSize)
+	if size == nil {
+		logger.Errorw("Invalid page size", "size", pageSize)
+		return nil, fmt.Errorf("invalid page size: %s", pageSize)
+	}
+
+	err = writer.WriteField("paperWidth", strconv.Itoa(size.Width)+"mm")
+	if err != nil {
+		logger.Errorw("Failed to write paper width", "error", err)
+		return nil, err
+	}
+
+	err = writer.WriteField("paperHeight", strconv.Itoa(size.Height)+"mm")
+	if err != nil {
+		logger.Errorw("Failed to write paper height", "error", err)
+		return nil, err
+	}
+
+	err = writer.WriteField("landscape", strconv.FormatBool(landscape))
+	if err != nil {
+		logger.Errorw("Failed to write landscape", "error", err)
+		return nil, err
+	}
+
+	err = writer.WriteField("marginTop", "0")
+	if err != nil {
+		logger.Errorw("Failed to write margin top", "error", err)
+		return nil, err
+	}
+
+	err = writer.WriteField("marginBottom", "0")
+	if err != nil {
+		logger.Errorw("Failed to write margin bottom", "error", err)
+		return nil, err
+	}
+
+	err = writer.WriteField("marginLeft", "0")
+	if err != nil {
+		logger.Errorw("Failed to write margin left", "error", err)
+		return nil, err
+	}
+
+	err = writer.WriteField("marginRight", "0")
+	if err != nil {
+		logger.Errorw("Failed to write margin right", "error", err)
+		return nil, err
+	}
+
+	err = writer.WriteField("preferCssPageSize", "true")
+	if err != nil {
+		logger.Errorw("Failed to write prefer css page size", "error", err)
+		return nil, err
+	}
+
+	err = writer.Close()
+	if err != nil {
+		logger.Errorw("Failed to close writer", "error", err)
+		return nil, err
+	}
+	logger.Debug("Created form data")
+
+	logger.Debug("Creating HTTP request")
+	req, err := http.NewRequest("POST", g.BaseUrl+"/forms/chromium/convert/html", body)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", writer.FormDataContentType())
+
+	logger.Debug("Sending HTTP request")
+	resp, err := client.Do(req)
+	if err != nil {
+		logger.Errorw("Failed to send request", "error", err)
+		return nil, err
+	}
+	logger.Debug("Received HTTP response")
+
+	defer resp.Body.Close()
+	data := new(bytes.Buffer)
+	_, err = data.ReadFrom(resp.Body)
+	if err != nil {
+		logger.Errorw("Failed to read response body", "error", err)
+		return nil, err
+	}
+
+	logger.Debug("Returning PDF data")
+	return data.Bytes(), nil
+}

services/templater.go

@@ -0,0 +1,103 @@
+package services
+
+import (
+	"bytes"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"html/template"
+	"strings"
+
+	"go.uber.org/zap"
+)
+
+type Templater interface {
+	Execute(template *template.Template, data interface{}) (string, error)
+	StringToTemplate(templateString string) (*template.Template, error)
+}
+
+type DefaultTemplater struct {
+	BarcodeService BarcodeService
+	StaticService  StaticService
+	Logger         *zap.SugaredLogger
+}
+
+func idToEan13(id string, prefix string) (string, error) {
+	if len(id) > 12 {
+		return "", errors.New("id too long")
+	}
+
+	for len(id) < 11 {
+		id = "0" + id
+	}
+	id = prefix + id
+
+	return id, nil
+}
+
+func (t *DefaultTemplater) GenerateBarcode(code string, format string, prefix string) (string, error) {
+	var err error
+
+	if format == "ean13" {
+		code, err = idToEan13(code, prefix)
+		if err != nil {
+			return "", err
+		}
+	}
+
+	buf, err := t.BarcodeService.GenerateBarcode(format, code, 1000, 500, 0)
+
+	return base64.StdEncoding.EncodeToString(buf.Bytes()), err
+}
+
+func (t *DefaultTemplater) SelectSponsorImage(id int) (string, error) {
+	logger := t.Logger.Named("SelectSponsorImage")
+	sponsors, err := t.StaticService.ListFilesInStaticSubFolder("images/sponsors")
+	if err != nil {
+		logger.Errorw("Failed to list sponsors", "error", err)
+		return "", err
+	}
+	logger.Debugw("Selected sponsor", "sponsors", sponsors, "id", id, "selected", sponsors[id%len(sponsors)])
+	return t.StaticService.GetImage("sponsors/" + strings.TrimSuffix(sponsors[id%len(sponsors)], ".base64")), nil
+}
+
+func (t *DefaultTemplater) LoadImage(name string) (string, error) {
+	return t.StaticService.GetImage(name), nil
+}
+
+func (t *DefaultTemplater) FormatUnit(unit string, locale string, amount int) (string, error) {
+	var formatted string
+	switch unit {
+	case "kilometer":
+		formatted = fmt.Sprintf("%.3f", float64(amount)/1000)
+	case "euro":
+		formatted = fmt.Sprintf("%.2f", float64(amount)/100)
+	default:
+		return "", errors.New("unknown unit")
+	}
+
+	if locale == "de" {
+		return strings.Replace(formatted, ".", ",", -1), nil
+	}
+	return formatted, nil
+}
+
+func (t *DefaultTemplater) StringToTemplate(templateString string) (*template.Template, error) {
+	return template.New("template").Funcs(template.FuncMap{
+		"barcode":     t.GenerateBarcode,
+		"sponsorLogo": t.SelectSponsorImage,
+		"formatUnit":  t.FormatUnit,
+		"loadImage":   t.LoadImage,
+	}).Parse(templateString)
+}
+
+func (t *DefaultTemplater) Execute(baseTemplate *template.Template, data interface{}) (string, error) {
+	resultBuffer := new(bytes.Buffer)
+
+	err := baseTemplate.Execute(resultBuffer, data)
+	if err != nil {
+		return "", err
+	}
+
+	return resultBuffer.String(), nil
+}

static/templates/card/de.html

@@ -0,0 +1,84 @@
+<html>
+
+<head>
+  <meta charset="utf8">
+  <title>Sponsoring contract</title>
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.1/css/bulma.min.css">
+  <style>
+    .sheet {
+      margin: 0;
+      overflow: hidden;
+      position: relative;
+      box-sizing: border-box;
+      page-break-after: always;
+      padding: 1.2cm 2cm 1.2cm 2cm
+    }
+
+    body.A4 .sheet {
+      width: 210mm;
+      height: 296mm
+    }
+
+    .runnercard {
+      border: 1px solid;
+      height: 5.5cm;
+      overflow: hidden;
+    }
+  </style>
+</head>
+
+<body class="A4 landscape">
+  {{ range .CardSegments }}
+  <div class="sheet">
+    <div class="columns is-multiline">
+      {{ range .Cards }}
+      <div class="column is-half runnercard">
+        {{ if ne .Code "" }}
+        <p class="title is-5" style="text-align: center; padding-bottom: 0; margin-top: -0.75rem;">{{ $.EventName }}</p>
+        <p style="text-align: center; margin-top: -1.5rem; font-size: small;">{{ $.CardSubtitle }}</p>
+        <p style="font-size: small;">Mit Unterstützung von:</p>
+        <div class="columns" style="height: 6rem; overflow: hidden;">
+          <div class="column is-half">
+            <!--SPONSOR LOGO HERE-->
+            <img style="vertical-align: revert; margin-top: auto; object-fit: cover; max-height: 2cm;"
+              src="data:image/png;base64,{{ sponsorLogo .ID }}" />
+          </div>
+          <div class="column is-half">
+            <!--BARCODE HERE-->
+            <img style="vertical-align: revert; margin-top: auto; object-fit: cover; max-height: 5rem;"
+              src="data:image/png;base64,{{ barcode .Code $.BarcodeFormat $.BarcodePrefix }}" />
+            <p style="font-size: 0.6rem; text-align: center; margin: 0; padding: 0;">{{ .Code }}</p>
+          </div>
+        </div>
+        {{ if ne .Runner.FirstName "" }}
+        <p>{{ .Runner.LastName }}, {{ .Runner.FirstName }} {{ .Runner.MiddleName }}</p>
+        <p>{{ if ne .Runner.Group.ParentGroup.Name "" -}}{{ .Runner.Group.ParentGroup.Name }}/{{end -}}{{ .Runner.Group.Name }}</p>
+        {{ else }}
+        <p>Kein Läufer zugewiesen</p>
+        {{ end}}
+        {{ end}}
+      </div>
+      {{ end }}
+    </div>
+  </div>
+  <div class="sheet">
+    <div class="columns is-multiline">
+      {{ range .CardsSwapped }}
+      <div class="column is-half runnercard" style="justify-content: center; align-items: center; text-align: center;">
+        {{ if ne .Code "" }}
+        <!--SPONSOR LOGO FIRST-->
+        <div style="height: 2cm; padding: 0 0 1cm 0">
+          <img style="object-fit: cover; max-height: 2cm;" src="data:image/png;base64,{{ sponsorLogo .ID }}" />
+        </div>
+        <img style="object-fit: cover; max-height: 6rem; position: relative;"
+          src="data:image/png;base64,{{ barcode .Code $.BarcodeFormat $.BarcodePrefix }}" />
+        <p style="font-size: 1rem; text-align: center; margin: 0; padding: 0;">{{ .Code }}</p>
+        {{ end }}
+      </div>
+      {{ end }}
+    </div>
+  </div>
+  {{ end}}
+</body>
+
+</html>

static/templates/card/en.html

@@ -0,0 +1,79 @@
+<html>
+
+<head>
+  <meta charset="utf8">
+  <title>Sponsoring contract</title>
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.1/css/bulma.min.css">
+  <style>
+    .sheet {
+      margin: 0;
+      overflow: hidden;
+      position: relative;
+      box-sizing: border-box;
+      page-break-after: always;
+      padding: 1.2cm 2cm 1.2cm 2cm
+    }
+
+    body.A4 .sheet {
+      width: 210mm;
+      height: 296mm
+    }
+
+    .runnercard {
+      border: 1px solid;
+      height: 5.5cm;
+      overflow: hidden;
+    }
+  </style>
+</head>
+
+<body class="A4 landscape">
+  {{ range .CardSegments }}
+  <div class="sheet">
+    <div class="columns is-multiline">
+      {{ range .Cards }}
+      <div class="column is-half runnercard">
+        <p class="title is-5" style="text-align: center; padding-bottom: 0; margin-top: -0.75rem;">{{ $.EventName }}</p>
+        <p style="text-align: center; margin-top: -1.5rem; font-size: small;">{{ $.CardSubtitle }}</p>
+        <p style="font-size: small;">Supported by:</p>
+        <div class="columns" style="height: 6rem; overflow: hidden;">
+          <div class="column is-half">
+            <!--SPONSOR LOGO HERE-->
+            <img style="vertical-align: revert; margin-top: auto; object-fit: cover; max-height: 2cm;"
+              src="data:image/png;base64,{{ sponsorLogo .ID }}" />
+          </div>
+          <div class="column is-half">
+            <!--BARCODE HERE-->
+            <img style="vertical-align: revert; margin-top: auto; object-fit: cover; max-height: 5rem;"
+              src="data:image/png;base64,{{ barcode .Code $.BarcodeFormat $.BarcodePrefix }}" />
+            <p style="font-size: 0.6rem; text-align: center; margin: 0; padding: 0;">{{ .Code }}</p>
+          </div>
+        </div>
+        {{ if ne .Runner.FirstName ""}}
+        <p>{{ .Runner.LastName }}, {{ .Runner.FirstName }} {{ .Runner.MiddleName }}</p>
+        <p>{{ if ne .Runner.Group.ParentGroup.Name "" -}}{{ .Runner.Group.ParentGroup.Name }}/{{end -}}{{ .Runner.Group.Name }}</p>
+        {{ else }}
+        <p>Blank card</p>
+        {{ end}}
+      </div>
+      {{ end }}
+    </div>
+  </div>
+  <div class="sheet">
+    <div class="columns is-multiline">
+      {{ range .CardsSwapped }}
+      <div class="column is-half runnercard" style="justify-content: center; align-items: center; text-align: center;">
+        <!--SPONSOR LOGO FIRST-->
+        <div style="height: 2cm; padding: 0 0 1cm 0">
+          <img style="object-fit: cover; max-height: 2cm;" src="data:image/png;base64,{{ sponsorLogo .ID }}" />
+        </div>
+        <img style="object-fit: cover; max-height: 6rem; position: relative;" src="data:image/png;base64,{{ barcode .Code $.BarcodeFormat $.BarcodePrefix }}" />
+        <p style="font-size: 1rem; text-align: center; margin: 0; padding: 0;">{{ .Code }}</p>
+      </div>
+      {{ end }}
+    </div>
+  </div>
+  {{ end}}
+</body>
+
+</html>

static/templates/certificate/de.html

@@ -0,0 +1,102 @@
+<html>
+
+<head>
+  <meta charset="utf8">
+  <title>Sponsoring contract</title>
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.1/css/bulma.min.css">
+  <style>
+    .sheet {
+      margin: 0;
+      overflow: hidden;
+      position: relative;
+      box-sizing: border-box;
+      page-break-after: always;
+      padding: 1.2cm 2cm 1.2cm 2cm;
+      background-image: url("data:image/png;base64,{{ loadImage "certificate_background" }}");
+      background-repeat: no-repeat;
+      background-size: 11cm;
+      background-position: 5cm 5cm;
+      color: #000;
+      /* border-style: solid; */
+    }
+
+    h1,
+    h2,
+    h3,
+    p {
+      color: black;
+    }
+
+    body.A4 .sheet {
+      width: 210mm;
+      height: 296mm
+    }
+
+    .certificate-footer {
+      position: absolute;
+      bottom: 0cm;
+    }
+
+    td {
+      border: 1px solid black;
+      font-size: large;
+      font-weight: 600;
+    }
+  </style>
+</head>
+
+<body class="A4 landscape">
+  {{ range .Runners }}
+  <article class="sheet">
+    <header class="content has-text-centered">
+      <p style="font-size: 3cm; font-weight: bold;">Urkunde</p>
+    </header>
+    <main class="content has-text-centered" style="padding-top: 3cm;">
+      <p style="width: 50%; font-size: 4vw; font-weight: bold; margin-bottom: 0; display: inline;">{{ .FirstName }}
+        {{ .MiddleName }} {{ .LastName }}
+      </p>
+      <p style="font-size: 1cm; margin-bottom: 0;">hat beim {{ $.EventName }}</p>
+      <p style="font-size: 2cm; font-weight: bold; margin-bottom: 0;">{{formatUnit "kilometer" $.Locale .Distance}}km</p>
+      <p style="font-size: 1cm;">für den guten Zweck zurückgelegt</p>
+    </main>
+    <footer class="certificate-footer">
+      <img src="data:image/png;base64,{{ loadImage "certificate_footer" }}">
+    </footer>
+  </article>
+  <article class="sheet">
+    <header class="content has-text-centered">
+      <p style="font-size: 2.5cm; font-weight: bold;">Sponsorings</p>
+    </header>
+    <main>
+      <table style="border: solid; width: 17cm;">
+        <thead>
+          <td class=".td-head">Sponsor:in</td>
+          <td>Betrag/km</td>
+          <td>Gesamtbetrag</td>
+        </thead>
+        <tbody>
+          {{ range .DistanceDonations}}
+          <tr>
+            <td>{{ .Donor.FirstName }} {{ .Donor.MiddleName }} {{ .Donor.LastName }}</td>
+            <td>{{ formatUnit "euro" $.Locale .AmountPerDistance }} {{ $.CurrencySymbol }}</td>
+            <td>{{ formatUnit "euro" $.Locale .Amount }} {{ $.CurrencySymbol }}</td>
+          </tr>
+          {{ end }}
+        </tbody>
+        <tfoot>
+          <td>Gesamt</td>
+          <td>{{ formatUnit "euro" $.Locale .TotalPerDistance }} {{ $.CurrencySymbol }}</td>
+          <td>{{ formatUnit "euro" $.Locale .TotalDonations }} {{ $.CurrencySymbol }}</td>
+        </tfoot>
+      </table>
+    </main>
+    <footer class="certificate-footer">
+      <p>
+        {{ $.Footer }}
+      </p>
+    </footer>
+  </article>
+  {{ end }}
+</body>
+
+</html>

static/templates/certificate/en.html

@@ -0,0 +1,102 @@
+<html>
+
+<head>
+  <meta charset="utf8">
+  <title>Sponsoring contract</title>
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.1/css/bulma.min.css">
+  <style>
+    .sheet {
+      margin: 0;
+      overflow: hidden;
+      position: relative;
+      box-sizing: border-box;
+      page-break-after: always;
+      padding: 1.2cm 2cm 1.2cm 2cm;
+      background-image: url("data:image/png;base64,{{ loadImage "certificate_background" }}");
+      background-repeat: no-repeat;
+      background-size: 11cm;
+      background-position: 5cm 5cm;
+      color: #000;
+      /* border-style: solid; */
+    }
+
+    h1,
+    h2,
+    h3,
+    p {
+      color: black;
+    }
+
+    body.A4 .sheet {
+      width: 210mm;
+      height: 296mm
+    }
+
+    .certificate-footer {
+      position: absolute;
+      bottom: 0cm;
+    }
+
+    td {
+      border: 1px solid black;
+      font-size: large;
+      font-weight: 600;
+    }
+  </style>
+</head>
+
+<body class="A4 landscape">
+  {{ range .Runners }}
+  <article class="sheet">
+    <header class="content has-text-centered">
+      <p style="font-size: 3cm; font-weight: bold;">Certificate</p>
+    </header>
+    <main class="content has-text-centered" style="padding-top: 3cm;">
+      <p style="width: 50%; font-size: 4vw; font-weight: bold; margin-bottom: 0; display: inline;">{{ .FirstName }}
+        {{ .MiddleName }} {{ .LastName }}
+      </p>
+      <p style="font-size: 1cm; margin-bottom: 0;">Ran</p>
+      <p style="font-size: 2cm; font-weight: bold; margin-bottom: 0;">{{formatUnit "kilometer" $.Locale .Distance}}km</p>
+      <p style="font-size: 1cm;">for our good cause at the {{ $.EventName }}</p>
+    </main>
+    <footer class="certificate-footer">
+      <img src="data:image/png;base64,{{ loadImage "certificate_footer" }}">
+    </footer>
+  </article>
+  <article class="sheet">
+    <header class="content has-text-centered">
+      <p style="font-size: 2.5cm; font-weight: bold;">Donations</p>
+    </header>
+    <main>
+      <table style="border: solid; width: 17cm;">
+        <thead>
+          <td class=".td-head">Donor</td>
+          <td>Amount / km</td>
+          <td>Total</td>
+        </thead>
+        <tbody>
+          {{ range .DistanceDonations}}
+          <tr>
+            <td>{{ .Donor.FirstName }} {{ .Donor.MiddleName }} {{ .Donor.LastName }}</td>
+            <td>{{ formatUnit "euro" $.Locale .AmountPerDistance }} {{ $.CurrencySymbol }}</td>
+            <td>{{ formatUnit "euro" $.Locale .Amount }} {{ $.CurrencySymbol }}</td>
+          </tr>
+          {{ end }}
+        </tbody>
+        <tfoot>
+          <td>Combined</td>
+          <td>{{ formatUnit "euro" $.Locale .TotalPerDistance }} {{ $.CurrencySymbol }}</td>
+          <td>{{ formatUnit "euro" $.Locale .TotalDonations }} {{ $.CurrencySymbol }}</td>
+        </tfoot>
+      </table>
+    </main>
+    <footer class="certificate-footer">
+      <p>
+        {{ $.Footer }}
+      </p>
+    </footer>
+  </article>
+  {{ end }}
+</body>
+
+</html>

static/templates/contract/de.html

@@ -0,0 +1,124 @@
+<html>
+
+<head>
+  <meta charset="utf8">
+  <title>Sponsoring contract</title>
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.1/css/bulma.min.css">
+  <style>
+    .sheet {
+      margin: 0;
+      overflow: hidden;
+      position: relative;
+      box-sizing: border-box;
+      page-break-after: always;
+    }
+
+    body.A5.landscape .sheet {
+      width: 210mm;
+      height: 147mm
+    }
+
+    .column {
+      margin-bottom: -20;
+    }
+  </style>
+</head>
+
+<body class="A5 landscape">
+  {{ range .Runners }}
+  <div class="sheet">
+    <img id="header_img" width="100%" src="data:image/png;base64,{{ loadImage "sponsoringheader" }}" />
+    <div style=" padding: 0 1rem 0 1rem;">
+      <div class="columns">
+        <div class="column is-10">
+          <div class="columns" style="padding-bottom: 0;">
+            <div class="column is-two-fifths">
+              <p style="font-size: large; font-weight: bold;">Sponsoringerklärung</p>
+            </div>
+            <div class="column">
+              <p style="font-size: x-small; vertical-align: revert; margin-top: auto;">Bitte in DRUCKBUCHSTABEN
+                schreiben
+              </p>
+            </div>
+          </div>
+          <p>Ich bin/ Wir sind bereit anlässlich des {{ $.EventName }}</p>
+          <div class="columns">
+            <div class="column is-9">
+              <span style="border-bottom: 1px solid; width: 100%; display: block;">{{ .FirstName }}
+                {{ .MiddleName }}</span>
+              <p style="font-size: x-small; display: block;">Vorname</p>
+            </div>
+            <div class="column is-3">
+              <span style="border-bottom: 1px solid; width: 100%; display: block;">{{ .ID }}</span>
+              <p style="font-size: x-small; display: block;">ID</p>
+            </div>
+          </div>
+        </div>
+        <div class="column">
+          <img style="vertical-align: revert; margin-top: auto; object-fit: cover; max-height: 2cm;"
+            src="data:image/png;base64,{{ barcode (printf "%d" .ID) $.BarcodeFormat $.BarcodePrefix }}" />
+        </div>
+      </div>
+      <div class="columns" style="padding-top: 1rem;">
+        <div class="column is-6">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;">{{ .LastName }}</span>
+          <p style="font-size: x-small; display: block;">Nachname</p>
+        </div>
+        <div class="column is-6">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"><p>{{ if ne .Group.ParentGroup.Name "" -}}{{ .Group.ParentGroup.Name }}/ {{end -}}{{ .Group.Name }}</p></span>
+          <p style="font-size: x-small; display: block;">Team/Klasse</p>
+        </div>
+      </div>
+      <p style="margin-top: -0.5rem">mit einem Betrag von _____ {{ $.CurrencySymbol }} pro gelaufenem Kilometer zu
+        unterstützen.</p>
+      <div class="columns" style="margin-top: -1rem;">
+        <div class="column is-6">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Nachname</p>
+        </div>
+        <div class="column is-6">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Vorname</p>
+        </div>
+      </div>
+      <p style="font-size: medium; margin-top: -0.5rem;">Adresse (Sponsor)</p>
+      <p style="font-size: x-small;">(Muss ausgefüllt werden, wenn Sie eine Spendenquittung benötigen -
+        Spendenquittungen können erst ab einem Gesamtbetrag von {{ $.ReceiptMinimumAmount }}{{ $.CurrencySymbol }}
+        ausgestellt werden)</p>
+      <div class="columns" style="margin-top: -1rem;">
+        <div class="column is-8">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Straße</p>
+        </div>
+        <div class="column is-4">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Hausnummer</p>
+        </div>
+      </div>
+      <div class="columns" style="margin-top: -1rem;">
+        <div class="column is-4">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Postleitzahl</p>
+        </div>
+        <div class="column is-8">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Stadt</p>
+        </div>
+      </div>
+      <div class="columns" style="margin-top: -1rem;">
+        <div class="column is-7">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Ort, Datum</p>
+        </div>
+        <div class="column is-5">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Unterschrift</p>
+        </div>
+      </div>
+      <p style="font-size: xx-small; overflow: hidden; height: 4rem; text-align: center;"> {{ $.Disclaimer }}</p>
+    </div>
+  </div>
+  {{ end }}
+</body>
+
+</html>

static/templates/contract/en.html

@@ -0,0 +1,120 @@
+<html>
+
+<head>
+  <meta charset="utf8">
+  <title>Sponsoring contract</title>
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.1/css/bulma.min.css">
+  <style>
+    .sheet {
+      margin: 0;
+      overflow: hidden;
+      position: relative;
+      box-sizing: border-box;
+      page-break-after: always;
+    }
+
+    body.A5.landscape .sheet {
+      width: 210mm;
+      height: 147mm
+    }
+
+    .column {
+      margin-bottom: -20;
+    }
+  </style>
+</head>
+
+<body class="A5 landscape">
+  {{ range .Runners }}
+  <div class="sheet">
+    <img id="header_img" width="100%" src="data:image/png;base64,{{ loadImage "sponsoringheader" }}" />
+    <div style=" padding: 0 1rem 0 1rem;">
+      <div class="columns">
+        <div class="column is-10">
+          <div class="columns" style="padding-bottom: 0;">
+            <div class="column is-two-fifths">
+              <p style="font-size: large; font-weight: bold;">Sponsoring contract</p>
+            </div>
+            <div class="column">
+              <p style="font-size: x-small; vertical-align: revert; margin-top: auto;">Please write in BLOCK LETTERS.
+              </p>
+            </div>
+          </div>
+          <p> On the occasion of the {{ $.EventName }} I/We want to support </p>
+          <div class="columns">
+            <div class="column is-9">
+              <span style="border-bottom: 1px solid; width: 100%; display: block;">{{ .FirstName }}
+                {{ .MiddleName }}</span>
+              <p style="font-size: x-small; display: block;">First name</p>
+            </div>
+            <div class="column is-3">
+              <span style="border-bottom: 1px solid; width: 100%; display: block;">{{ .ID }}</span>
+              <p style="font-size: x-small; display: block;">ID</p>
+            </div>
+          </div>
+        </div>
+        <div class="column">
+          <img style="vertical-align: revert; margin-top: auto; object-fit: cover; max-height: 2cm;"
+            src="data:image/png;base64,{{ barcode (printf "%d" .ID) $.BarcodeFormat $.BarcodePrefix }}"/>
+        </div>
+      </div>
+      <div class="columns" style="padding-top: 1rem;">
+        <div class="column is-6">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;">{{ .LastName }}</span>
+          <p style="font-size: x-small; display: block;">Last Name</p>
+        </div>
+        <div class="column is-6">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"><p>{{ if ne .Group.ParentGroup.Name "" -}}{{ .Group.ParentGroup.Name }}/ {{end -}}{{ .Group.Name }}</p></span>
+          <p style="font-size: x-small; display: block;">Team/class</p>
+        </div>
+      </div>
+      <p style="margin-top: -0.5rem">with the amount of _____{{ $.CurrencySymbol }} per kilometer run.</p>
+      <div class="columns" style="margin-top: -1rem;">
+        <div class="column is-6">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Last name</p>
+        </div>
+        <div class="column is-6">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">First name</p>
+        </div>
+      </div>
+      <p style="font-size: medium; margin-top: -0.5rem;">Address (Sponsor)</p>
+      <p style="font-size: x-small;">(You have to provide an address if you want a donation receipt - Donation receipts can't be issued for total donation amounts under {{ $.ReceiptMinimumAmount }}{{ $.CurrencySymbol }})</p>
+      <div class="columns" style="margin-top: -1rem;">
+        <div class="column is-8">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Street</p>
+        </div>
+        <div class="column is-4">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">House number</p>
+        </div>
+      </div>
+      <div class="columns" style="margin-top: -1rem;">
+        <div class="column is-4">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Postal code</p>
+        </div>
+        <div class="column is-8">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">City</p>
+        </div>
+      </div>
+      <div class="columns" style="margin-top: -1rem;">
+        <div class="column is-7">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Location, Date</p>
+        </div>
+        <div class="column is-5">
+          <span style="border-bottom: 1px solid; width: 100%; display: block;"> </span>
+          <p style="font-size: x-small; display: block;">Signature</p>
+        </div>
+      </div>
+      <p style="font-size: xx-small; overflow: hidden; height: 4rem; text-align: center;">{{ $.Disclaimer }}</p>
+    </div>
+  </div>
+  {{ end }}
+</body>
+
+</html>