fix(docker): Switch to alpine baseimage for temp file support

.env

@@ -16,4 +16,8 @@ SPONSORING_DISCLAIMER=Kaya ist cool, aber pass auf, dass du nicht zu viel Geld s
 SPONSORING_BARCODEFORMAT=code128
 # SPONSORING_BARCODEPREFIX=
 
-CERTIFICATE_FOOTER=Kaya ist cool, danke für deine Unterstützung!
+CERTIFICATE_FOOTER=Kaya ist cool, danke für deine Unterstützung!
+
+SEPA_BIC=FNOMDEB2
+SEPA_NAME=ODIT.Services
+SEPA_IBAN=DE25100180000690238989

Dockerfile

@@ -8,8 +8,9 @@ RUN go mod download
 COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build -o server
 
-FROM scratch
+FROM alpine:3.18
+RUN mkdir -p /tmp && chmod 1777 /tmp
+
 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" ]

go.mod

@@ -23,8 +23,11 @@ require (
 	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/hhrutter/lzw v1.0.0 // indirect
+	github.com/hhrutter/pkcs7 v0.2.0 // indirect
+	github.com/hhrutter/tiff v1.0.2 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
-	github.com/klauspost/compress v1.17.11 // indirect
+	github.com/klauspost/compress v1.18.0 // 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
@@ -33,7 +36,9 @@ require (
 	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/pdfcpu/pdfcpu v0.10.2 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/pkg/errors v0.9.1 // 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
@@ -46,16 +51,19 @@ require (
 	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/fasthttp v1.61.0 // 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/crypto v0.37.0 // 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/image v0.26.0 // indirect
+	golang.org/x/sys v0.32.0 // indirect
+	golang.org/x/text v0.24.0 // 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.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -29,10 +29,18 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
+github.com/hhrutter/lzw v1.0.0 h1:laL89Llp86W3rRs83LvKbwYRx6INE8gDn0XNb1oXtm0=
+github.com/hhrutter/lzw v1.0.0/go.mod h1:2HC6DJSn/n6iAZfgM3Pg+cP1KxeWc3ezG8bBqW5+WEo=
+github.com/hhrutter/pkcs7 v0.2.0 h1:i4HN2XMbGQpZRnKBLsUwO3dSckzgX142TNqY/KfXg+I=
+github.com/hhrutter/pkcs7 v0.2.0/go.mod h1:aEzKz0+ZAlz7YaEMY47jDHL14hVWD6iXt0AgqgAvWgE=
+github.com/hhrutter/tiff v1.0.2 h1:7H3FQQpKu/i5WaSChoD1nnJbGx4MxU5TlNqqpxw55z8=
+github.com/hhrutter/tiff v1.0.2/go.mod h1:pcOeuK5loFUE7Y/WnzGw20YxUdnqjY1P0Jlcieb/cCw=
 github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
 github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
 github.com/klauspost/compress v1.17.11 h1:In6xLpyWOi1+C7tXUUWv2ot1QvBjxevKAaI6IXrJmUc=
 github.com/klauspost/compress v1.17.11/go.mod h1:pMDklpSncoRMuLFrf1W9Ss9KT+0rH90U12bZKk7uwG0=
+github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
+github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -54,8 +62,12 @@ github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyua
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/oxplot/papersizes v0.0.0-20181201065918-90a3a5ae1915 h1:4WzMzgExTgBfuUQ/HegMf+jcHtH+c3fl7eySUQUbfzg=
 github.com/oxplot/papersizes v0.0.0-20181201065918-90a3a5ae1915/go.mod h1:LJRTnhoARxQgMyT7T9L+ZzwR4OrmyHTy5LPxZEzE1CM=
+github.com/pdfcpu/pdfcpu v0.10.2 h1:DB2dWuoq0eF0QwHjgyLirYKLTCzFOoZdmmIUSu72aL0=
+github.com/pdfcpu/pdfcpu v0.10.2/go.mod h1:Q2Z3sqdRqHTdIq1mPAUl8nfAoim8p3c1ASOaQ10mCpE=
 github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM=
 github.com/pelletier/go-toml/v2 v2.2.2/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h4qDAS4n929Rs=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/redis/go-redis/v9 v9.7.0 h1:HhLSs+B6O021gwzl+locl0zEDnyNkxMtf/Z3NNBMa9E=
@@ -99,6 +111,8 @@ github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6Kllzaw
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 github.com/valyala/fasthttp v1.57.0 h1:Xw8SjWGEP/+wAAgyy5XTvgrWlOD1+TxbbvNADYCm1Tg=
 github.com/valyala/fasthttp v1.57.0/go.mod h1:h6ZBaPRlzpZ6O3H5t2gEk1Qi33+TmLvfwgLLp0t9CpE=
+github.com/valyala/fasthttp v1.61.0 h1:VV08V0AfoRaFurP1EWKvQQdPTZHiUzaVoulX1aBDgzU=
+github.com/valyala/fasthttp v1.61.0/go.mod h1:wRIV/4cMwUPWnRcDno9hGnYZGh78QzODFfo1LTUhBog=
 github.com/valyala/tcplisten v1.0.0 h1:rBHj/Xf+E1tRGZyWIWwJDiRY0zc1Js+CV5DqwacVSA8=
 github.com/valyala/tcplisten v1.0.0/go.mod h1:T0xQ8SeCZGxckz9qRXTfG43PvQ/mcWh7FwZEA7Ioqkc=
 github.com/xyproto/randomstring v1.0.5 h1:YtlWPoRdgMu3NZtP45drfy1GKoojuR7hmRcnhZqKjWU=
@@ -111,8 +125,12 @@ go.uber.org/multierr v1.10.0 h1:S0h4aNzvfcFsC3dRF1jLoaov7oRaKqRGC/pUEJ2yvPQ=
 go.uber.org/multierr v1.10.0/go.mod h1:20+QtiLqy0Nd6FdQB9TLXag12DsQkrbs3htMFfDN80Y=
 go.uber.org/zap v1.27.0 h1:aJMhYGrd5QSmlpLMr2MftRKl7t8J8PTZPA732ud/XR8=
 go.uber.org/zap v1.27.0/go.mod h1:GB2qFLM7cTU87MWRP2mPIjqfIDnGu+VIO4V/SdhGo2E=
+golang.org/x/crypto v0.37.0 h1:kJNSjF/Xp7kU0iB2Z+9viTPMW4EqqsrywMXLJOOsXSE=
+golang.org/x/crypto v0.37.0/go.mod h1:vg+k43peMZ0pUMhYmVAWysMK35e6ioLh3wB8ZCAfbVc=
 golang.org/x/exp v0.0.0-20230905200255-921286631fa9 h1:GoHiUyI/Tp2nVkLI2mCxVkOjsbSXD66ic0XW0js0R9g=
 golang.org/x/exp v0.0.0-20230905200255-921286631fa9/go.mod h1:S2oDrQGGwySpoQPVqRShND87VCbxmc6bL1Yd2oYrm6k=
+golang.org/x/image v0.26.0 h1:4XjIFEZWQmCZi6Wv8BoxsDhRU3RVnLX04dToTDAEPlY=
+golang.org/x/image v0.26.0/go.mod h1:lcxbMFAovzpnJxzXS3nyL83K27tmqtKzIJpctK8YO5c=
 golang.org/x/mod v0.22.0 h1:D4nJWe9zXqHOmWqj4VMOJhvzj7bEZg4wEYa759z1pH4=
 golang.org/x/mod v0.22.0/go.mod h1:6SkKJ3Xj0I0BrPOZoBy3bdMptDDU9oJrpohJ3eWZ1fY=
 golang.org/x/sync v0.9.0 h1:fEo0HyrW1GIgZdpbhCRO0PkJajUS5H9IFUztCgEo2jQ=
@@ -121,8 +139,12 @@ golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.27.0 h1:wBqf8DvsY9Y/2P8gAfPDEYNuS30J4lPHJxXSb/nJZ+s=
 golang.org/x/sys v0.27.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.32.0 h1:s77OFDvIQeibCmezSnk/q6iAfkdiQaJi4VzroCFrN20=
+golang.org/x/sys v0.32.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 golang.org/x/text v0.19.0 h1:kTxAhCbGbxhK0IwgSKiMO5awPoDQ0RpfiVYBfK860YM=
 golang.org/x/text v0.19.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
+golang.org/x/text v0.24.0 h1:dd5Bzh4yt5KYA8f9CJHCP4FB4D51c2c6JvN37xJJkJ0=
+golang.org/x/text v0.24.0/go.mod h1:L8rBsPeo2pSS+xqN0d5u2ikmjtmoJbDBT1b7nHvFCdU=
 golang.org/x/tools v0.27.0 h1:qEKojBykQkQ4EynWy4S8Weg69NumxKdn40Fce3uc/8o=
 golang.org/x/tools v0.27.0/go.mod h1:sUi0ZgbwW9ZPAq26Ekut+weQPR5eIM6GQLQ1Yjm1H0Q=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
@@ -133,6 +155,8 @@ gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntN
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/ini.v1 v1.67.0 h1:Dgnx+6+nfE+IfzjUEISNeydPJh9AXNNsWbGP9KzCsOA=
 gopkg.in/ini.v1 v1.67.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

handlers/card.go

@@ -1,10 +1,14 @@
 package handlers
 
 import (
+	"fmt"
+	"os"
 	"slices"
 
 	"git.odit.services/lfk/document-server/models"
 	"github.com/gofiber/fiber/v2"
+	"github.com/pdfcpu/pdfcpu/pkg/api"
+	"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/model"
 )
 
 // GenerateCard godoc
@@ -18,7 +22,6 @@ import (
 //	@Security		ApiKeyAuth
 //	@Router			/v1/pdfs/cards [post]
 func (h *DefaultHandler) GenerateCard(c *fiber.Ctx) error {
-
 	logger := h.Logger.Named("GenerateCard")
 
 	cardRequest := new(models.CardRequest)
@@ -52,38 +55,115 @@ func (h *DefaultHandler) GenerateCard(c *fiber.Ctx) error {
 		})
 	}
 
-	genConfig := &models.CardTemplateOptions{
-		CardSegments:  splitCardSegments(cardRequest.Cards),
-		EventName:     h.Config.EventName,
-		CardSubtitle:  h.Config.CardSubtitle,
-		BarcodeFormat: h.Config.CardBarcodeFormat,
-		BarcodePrefix: h.Config.CardBarcodePrefix,
+	segmentLength := calculateOptimalSegmentSize(len(cardRequest.Cards))
+	pdfs := []string{}
+	for i := 0; i < len(cardRequest.Cards); i += segmentLength {
+
+		segment := cardRequest.Cards[i:]
+		if len(segment) > segmentLength {
+			segment = cardRequest.Cards[i : i+segmentLength]
+		}
+
+		genConfig := &models.CardTemplateOptions{
+			CardSegments:  splitCardSegments(segment),
+			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(),
+			})
+		}
+
+		tempFile, err := os.CreateTemp("", fmt.Sprintf("cards-%d-*.pdf", i/segmentLength))
+		if err != nil {
+			logger.Errorw("Error creating temp file", "error", err)
+			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+				"error": err.Error(),
+			})
+		}
+		defer os.Remove(tempFile.Name()) // Ensure cleanup even on error paths
+
+		if _, err := tempFile.Write(pdf); err != nil {
+			logger.Errorw("Error writing pdf to temp file", "error", err)
+			return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+				"error": err.Error(),
+			})
+		}
+		tempFile.Close()
+		pdfs = append(pdfs, tempFile.Name())
 	}
 
-	logger.Info("Generating card html")
-	result, err := h.Templater.Execute(template, genConfig)
+	outputFile := "./output.pdf"
+	conf := model.NewDefaultConfiguration()
+	err = api.MergeCreateFile(pdfs, outputFile, false, conf)
 	if err != nil {
-		logger.Errorw("Error executing template", "error", err)
+		logger.Errorw("Failed to merge PDFs", "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)
+	// Clean up individual PDF files
+	for _, file := range pdfs {
+		if err := os.Remove(file); err != nil {
+			logger.Warnw("Failed to remove temporary PDF file", "file", file, "error", err)
+		}
+	}
+
+	// Set headers and return the merged PDF
+	c.Set(fiber.HeaderContentType, "application/pdf")
+	c.Set(fiber.HeaderContentDisposition, "attachment; filename=runner-cards.pdf")
+	pdfBytes, err := os.ReadFile(outputFile)
 	if err != nil {
-		logger.Errorw("Error converting html to pdf", "error", err)
+		logger.Errorw("Failed to read merged PDF", "error", err)
 		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
 			"error": err.Error(),
 		})
 	}
+	os.Remove(outputFile) // Clean up the merged file
+
 	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)
+	return c.Send(pdfBytes)
+}
+
+func calculateOptimalSegmentSize(totalCards int) int {
+	if totalCards < 30 {
+		return 25 // Reduces overhead for really small batches
+	}
+
+	// Base size for small batches
+	if totalCards < 100 {
+		return 50
+	}
+
+	// For medium batches
+	if totalCards < 500 {
+		return 75
+	}
+
+	// For large batches, be more conservative
+	return 100
 }
 
 func invertCardArrayItemPairs(cards []models.Card) []models.Card {

handlers/certificate.go

@@ -58,6 +58,12 @@ func (h *DefaultHandler) GenerateCertificate(c *fiber.Ctx) error {
 		Footer:         h.Config.CertificateFooter,
 		CurrencySymbol: h.Config.CurrencySymbol,
 		Locale:         certificateRequest.Locale,
+		SepaConfig: &models.SepaConfig{
+			BIC:                h.Config.SepaBic,
+			HolderName:         h.Config.SepaName,
+			IBAN:               h.Config.SepaIban,
+			CurrencyIdentifier: h.Config.CurrencyIdentifier,
+		},
 	}
 
 	logger.Info("Generating certificate html")
@@ -90,6 +96,13 @@ func addUpRunnerDonations(runners []models.RunnerWithDonations) []models.RunnerW
 			runners[i].TotalDonations += runners[i].DistanceDonations[j].Amount
 			runners[i].TotalPerDistance += runners[i].DistanceDonations[j].AmountPerDistance
 		}
+		if runners[i].Group.ParentGroup.Name != "" {
+			runners[i].CombinedGroupName = runners[i].Group.ParentGroup.Name + " - " + runners[i].Group.Name
+		} else {
+			runners[i].CombinedGroupName = runners[i].Group.Name
+
+		}
+
 	}
 	return runners
 }

main.go

@@ -44,6 +44,7 @@ func loadEnv() error {
 	viper.SetDefault("APIKEY", "lfk")
 	viper.SetDefault("EVENTNAME", "Demo Event")
 	viper.SetDefault("CURRENCYSYMBOL", "€")
+	viper.SetDefault("CURRENCYIDENTIFIER", "EUR")
 	viper.SetDefault("CARD_SUBTITLE", "Runner Card")
 	viper.SetDefault("CARD_BARCODEFORMAT", "ean13")
 	viper.SetDefault("CARD_BARCODEPREFIX", "")
@@ -54,6 +55,9 @@ func loadEnv() error {
 	viper.SetDefault("CERTIFICATE_FOOTER", "Footer")
 	viper.SetDefault("GOTENBERG_BASEURL", "")
 	viper.SetDefault("REDIS_ADDR", "")
+	viper.SetDefault("SEPA_BIC", "")
+	viper.SetDefault("SEPA_NAME", "")
+	viper.SetDefault("SEPA_IBAN", "")
 
 	// Load .env file
 	viper.SetConfigFile(".env")

models/certificate.go

@@ -11,6 +11,7 @@ type RunnerWithDonations struct {
 	MiddleName        string             `json:"middle_name" validate:"optional"`
 	LastName          string             `json:"last_name" validate:"required"`
 	Group             Group              `json:"group" validate:"required"`
+	CombinedGroupName string             `json:"combined_group_name" validate:"optional"`
 	Distance          int                `json:"distance" validate:"required"`
 	DistanceDonations []DistanceDonation `json:"distance_donations" validate:"optional"`
 	TotalPerDistance  int                `json:"total_per_distance" validate:"optional"`
@@ -39,4 +40,12 @@ type CertificateTemplateOptions struct {
 	Footer         string                `json:"footer"`
 	CurrencySymbol string                `json:"currency_symbol"`
 	Locale         string                `json:"locale"`
+	SepaConfig     *SepaConfig           `json:"sepa_config"`
+}
+
+type SepaConfig struct {
+	IBAN               string `json:"iban" validate:"required"`
+	HolderName         string `json:"holder_name" validate:"required"`
+	BIC                string `json:"bic" validate:"required"`
+	CurrencyIdentifier string `json:"currency_identifier" validate:"required"`
 }

models/config.go

@@ -7,6 +7,7 @@ type Config struct {
 	APIKey                   string `mapstructure:"APIKEY"`
 	EventName                string `mapstructure:"EVENTNAME"`
 	CurrencySymbol           string `mapstructure:"CURRENCYSYMBOL"`
+	CurrencyIdentifier       string `mapstructure:"CURRENCYIDENTIFIER"`
 	CardSubtitle             string `mapstructure:"CARD_SUBTITLE"`
 	CardBarcodeFormat        string `mapstructure:"CARD_BARCODEFORMAT"`
 	CardBarcodePrefix        string `mapstructure:"CARD_BARCODEPREFIX"`
@@ -17,4 +18,7 @@ type Config struct {
 	CertificateFooter        string `mapstructure:"CERTIFICATE_FOOTER"`
 	GotenbergBaseUrl         string `mapstructure:"GOTENBERG_BASEURL"`
 	RedisAddr                string `mapstructure:"REDIS_ADDR"`
+	SepaBic                  string `mapstructure:"SEPA_BIC"`
+	SepaName                 string `mapstructure:"SEPA_NAME"`
+	SepaIban                 string `mapstructure:"SEPA_IBAN"`
 }

services/templater.go

@@ -35,6 +35,28 @@ func idToEan13(id string, prefix string) (string, error) {
 	return id, nil
 }
 
+func (t *DefaultTemplater) GenerateEPC(iban string, bic string, name string, title string, amount int, currency string) (string, error) {
+	var err error
+
+	code := fmt.Sprintf(`BCD
+002
+1
+INST
+%s
+%s
+%s
+%s%.2f
+
+%s
+
+`, bic, name, iban, currency, float64(amount)/100, title,
+	)
+
+	buf, err := t.BarcodeService.GenerateBarcode("qr", code, 500, 500, 0)
+
+	return base64.StdEncoding.EncodeToString(buf.Bytes()), err
+}
+
 func (t *DefaultTemplater) GenerateBarcode(code string, format string, prefix string) (string, error) {
 	var err error
 
@@ -88,6 +110,7 @@ func (t *DefaultTemplater) StringToTemplate(templateString string) (*template.Te
 		"sponsorLogo": t.SelectSponsorImage,
 		"formatUnit":  t.FormatUnit,
 		"loadImage":   t.LoadImage,
+		"epcCode":     t.GenerateEPC,
 	}).Parse(templateString)
 }
 

static/templates/certificate/de.html

@@ -57,7 +57,7 @@
       </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>
+      <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" }}">
@@ -94,7 +94,7 @@
             <thead>
               <tr>
               <th style="border: none; width: 50%; text-align: center;">Link zu deinen Rundenzeiten</th>
-              <!-- <th style="border: none; width: 50%; text-align: center;">Spende überweisen</th> -->
+              <th style="border: none; width: 50%; text-align: center;">Spende überweisen</th>
               </tr>
             </thead>
             <tbody>
@@ -103,14 +103,14 @@
                 <img src="data:image/png;base64,{{ barcode .SelfServiceLink "qr" "" }}" style="height: 2.5cm; padding: 0.2cm">
               </td>
               <td style="border: none; text-align: center;">
-                <!-- <img src="data:image/png;base64,{{ barcode ".SelfServiceLink" "qr" "" }}" style="height: 2.5cm; padding: 0.2cm"> -->
+                <img src="data:image/png;base64,{{ epcCode $.SepaConfig.IBAN $.SepaConfig.BIC $.SepaConfig.HolderName (print "Spende LfK " .ID ", "  .FirstName " " .LastName ", " .CombinedGroupName) .TotalDonations $.SepaConfig.CurrencyIdentifier}}" style="height: 2.5cm; padding: 0.2cm">
               </td>
               </tr>
             </tbody>
             </table>
-          <p style="text-align: center;">
-            {{ $.Footer }}
-          </p>
+            <p style="width: 17cm; text-align: center;">
+              Sponsoren überweisen ihre Beträge bitte auf unser Konto: {{ $.SepaConfig.HolderName }} | IBAN: {{ $.SepaConfig.IBAN }} | BIC: {{ $.SepaConfig.BIC }} | Vz: "Spende LfK {{.ID}}, {{ .FirstName }} {{ .LastName }}, {{.CombinedGroupName}}"
+            </p>
     </footer>
   </article>
   {{ end }}

static/templates/certificate/en.html

@@ -57,7 +57,7 @@
       </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>
+      <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" }}">
@@ -95,7 +95,7 @@
         <thead>
           <tr>
             <th style="border: none; width: 50%; text-align: center;">Link to your lap times</th>
-            <!-- <th style="border: none; width: 50%; text-align: center;">Transfer donation</th> -->
+            <th style="border: none; width: 50%; text-align: center;">Transfer donation via SEPA</th>
           </tr>
         </thead>
         <tbody>
@@ -104,13 +104,13 @@
             <img src="data:image/png;base64,{{ barcode .SelfServiceLink "qr" "" }}" style="height: 2.5cm; padding: 0.2cm">
           </td>
           <td style="border: none; text-align: center;">
-            <!-- <img src="data:image/png;base64,{{ barcode ".SelfServiceLink" "qr" "" }}" style="height: 2.5cm; padding: 0.2cm"> -->
+            <img src="data:image/png;base64,{{ epcCode $.SepaConfig.IBAN $.SepaConfig.BIC $.SepaConfig.HolderName (print "Spende LfK " .ID ", "  .FirstName " " .LastName ", " .CombinedGroupName) .TotalDonations $.SepaConfig.CurrencyIdentifier}}" style="height: 2.5cm; padding: 0.2cm">
           </td>
           </tr>
         </tbody>
         </table>
-      <p>
-        {{ $.Footer }}
+      <p style="width: 17cm; text-align: center;">
+        Donors, please transfer your donation to our account: {{ $.SepaConfig.HolderName }} | IBAN: {{ $.SepaConfig.IBAN }} | BIC: {{ $.SepaConfig.BIC }} | Ref: "Spende LfK {{.ID}}, {{ .FirstName }} {{ .LastName }}, {{.CombinedGroupName}}"
       </p>
     </footer>
   </article>