152 lines
6.6 KiB
C#
152 lines
6.6 KiB
C#
using System;
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using System.Text.Json.Serialization;
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using Microsoft.AspNetCore.Builder;
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using Microsoft.AspNetCore.Hosting;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.Extensions.Configuration;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Hosting;
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namespace ScrumTaskboard
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{
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public class Startup
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{
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/// <summary>
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/// Default constructor that "just" sets the configuration (needed by default for the ASP.NetCore Webservice)
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/// </summary>
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/// <param name="configuration">configuration for the new Startup object</param>
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public Startup(IConfiguration configuration)
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{
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Configuration = configuration;
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}
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//Default getter for the configuration
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public IConfiguration Configuration { get; }
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/// <summary>
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/// This method gets called by the runtime.
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/// It's used to add services to the container.
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/// </summary>
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/// <param name="services"></param>
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public void ConfigureServices(IServiceCollection services)
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{
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//CORS (Cross Origin Resource Sharing) controls from where a service can be accessed
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//Here we allow access from every origin by adding a policy called "AllowAll" that allows access form every origin with every method and any headers
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services.AddCors(o => o.AddPolicy("AllowAll", builder =>
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{
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builder.AllowAnyOrigin()
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.AllowAnyMethod()
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.AllowAnyHeader();
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}));
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//JSON parsing options control how JSON is parsed to get input or send output from/to the API endpoints
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//Here we allow null values for parameters and add a Enum converter for the "ScrumPrio" Enum
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services.AddMvc().AddJsonOptions(o =>
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{
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o.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter());
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o.JsonSerializerOptions.IgnoreNullValues = true;
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});
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//Adds the PostgreSQL based database context to provide database communication
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services.AddScoped(serviceProvider => new TaskContext(
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new DbContextOptionsBuilder<TaskContext>()
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.UseNpgsql(GetConnectionString())
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.Options));
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//Default Service call that adds all controllers (and thereby API endpoints) to the service
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services.AddControllers();
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//OpenAPI Document settings for autogenerating the OpenAPI v3 documentation
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//Here we set the basic information for the documentation - mainly: version, title, description and TOS
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services.AddOpenApiDocument(
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config =>
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{
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config.PostProcess = document =>
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{
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document.Info.Version = "v1";
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document.Info.Title = "Scrum Taskboard API";
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document.Info.Description = "A RESTful API for the Scrum Taskboard Backend";
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document.Info.TermsOfService = "None";
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};
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});
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}
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/// <summary>
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/// This method gets called by the runtime.
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/// This method gets used to configure the HTTP request pipeline.
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/// </summary>
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/// <param name="app"></param>
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/// <param name="env"></param>
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public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
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{
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//Ensure the existance of all tabels in the database (by creating them if they're missing)
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using (var serviceScope = app.ApplicationServices.GetService<IServiceScopeFactory>().CreateScope())
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{
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var context = serviceScope.ServiceProvider.GetRequiredService<TaskContext>();
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context.Database.EnsureCreated();
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}
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//Checks is developer mode is enabled in the env and adds the developer only exception page for debugging if it is enabled
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if (env.IsDevelopment())
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{
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app.UseDeveloperExceptionPage();
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}
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//Use the previously created "AllowAll" CORS policy
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app.UseCors("AllowAll");
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//Use the default ASP.NetCore routing
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app.UseRouting();
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//Use the endpoints provided by the controllers and map their urls accordingly
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app.UseEndpoints(endpoints =>
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{
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endpoints.MapControllers();
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});
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//Use the configured OpenAPI document config and add the url schemes for http and https.
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app.UseOpenApi(a => {
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a.PostProcess = (document, _) => {
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document.Schemes = new[] { NSwag.OpenApiSchema.Https, NSwag.OpenApiSchema.Http };
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document.Servers.Add(new NSwag.OpenApiServer { Description = "Demo Server", Url = "https://taskboard.dev.nig.gl/" });
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};
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});
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//Use the SwaggerUi v3 to provide a SwaggerUI based API explorer at "/swagger"
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app.UseSwaggerUi3(options =>
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{
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options.Path = "/swagger";
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});
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//Use Redoc to provide a ReDoc based API explorer at "/redoc"
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app.UseReDoc(options =>
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{
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options.Path = "/redoc";
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});
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}
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/// <summary>
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/// Creates DB connection string based on ENV vars and default vars.
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/// </summary>
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/// <returns>DB connection string</returns>
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public string GetConnectionString()
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{
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//Read the parameters for the connection string form env vars
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string dbHost = Environment.GetEnvironmentVariable("DATABASE_HOST");
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string dbPort = Environment.GetEnvironmentVariable("DATABASE_PORT");
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string dbName = Environment.GetEnvironmentVariable("DATABASE_NAME");
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string dbUser = Environment.GetEnvironmentVariable("DATABASE_USER");
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string dbPassword = Environment.GetEnvironmentVariable("DATABASE_PASSWORD");
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//Check if any of the env vars were null and set the parameters for the connection string to default parameters of any of them were null
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if(dbHost == null || dbPort == null || dbName == null || dbUser == null || dbPassword == null)
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{
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throw new ArgumentNullException();
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}
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//Return the created connection String
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return $"Host={dbHost}; Port={dbPort}; Username={dbUser}; Database={dbName}; Password={dbPassword}";
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}
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}
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}
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