5 files changed, 230 insertions, 0 deletions
diff --git a/docker/crupest-api/CrupestApi/CrupestApi.Todos/CrupestApi.Todos.csproj b/docker/crupest-api/CrupestApi/CrupestApi.Todos/CrupestApi.Todos.csproj
new file mode 100644
index 0000000..72a1294
--- /dev/null
+++ b/docker/crupest-api/CrupestApi/CrupestApi.Todos/CrupestApi.Todos.csproj
@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>
diff --git a/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosConfiguration.cs b/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosConfiguration.cs
new file mode 100644
index 0000000..e8160d2
--- /dev/null
+++ b/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosConfiguration.cs
@@ -0,0 +1,14 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace CrupestApi.Todos;
+
+public class TodosConfiguration
+{
+    [Required]
+    public string Username { get; set; } = default!;
+    [Required]
+    public int ProjectNumber { get; set; } = default!;
+    [Required]
+    public string Token { get; set; } = default!;
+    public int Count { get; set; }
+}
+\ No newline at end of file
diff --git a/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosService.cs b/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosService.cs
new file mode 100644
index 0000000..f5ccc09
--- /dev/null
+++ b/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosService.cs
@@ -0,0 +1,144 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Net.Mime;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace CrupestApi.Todos;
+
+public class TodosItem
+{
+    public string Status { get; set; } = default!;
+    public string Title { get; set; } = default!;
+    public bool Closed { get; set; }
+    public string Color { get; set; } = default!;
+}
+
+public class TodosService
+{
+    private readonly IOptionsSnapshot<TodosConfiguration> _options;
+    private readonly ILogger<TodosService> _logger;
+
+    public TodosService(IOptionsSnapshot<TodosConfiguration> options, ILogger<TodosService> logger)
+    {
+        _options = options;
+        _logger = logger;
+    }
+
+    private static string CreateGraphQLQuery(TodosConfiguration todoConfiguration)
+    {
+        return $$"""
+{
+    user(login: "{{todoConfiguration.Username}}") {
+        projectV2(number: {{todoConfiguration.ProjectNumber}}) {
+            items(last: {{todoConfiguration.Count}}) {
+                nodes {
+                    __typename
+                    content {
+                        __typename
+                        ... on Issue {
+                            title
+                            closed
+                        }
+                        ... on PullRequest {
+                            title
+                            closed
+                        }
+                        ... on DraftIssue {
+                            title
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+""";
+    }
+
+
+    public async Task<List<TodosItem>> GetTodosAsync()
+    {
+        var todoOptions = _options.Value;
+        if (todoOptions is null)
+        {
+            throw new Exception("Fail to get todos configuration.");
+        }
+
+        _logger.LogInformation("Username: {}; ProjectNumber: {}; Count: {}", todoOptions.Username, todoOptions.ProjectNumber, todoOptions.Count);
+        _logger.LogInformation("Getting todos from GitHub GraphQL API...");
+
+        using var httpClient = new HttpClient();
+
+        using var requestContent = new StringContent(JsonSerializer.Serialize(new
+        {
+            query = CreateGraphQLQuery(todoOptions)
+        }));
+        requestContent.Headers.ContentType = new MediaTypeHeaderValue(MediaTypeNames.Application.Json, Encoding.UTF8.WebName);
+
+        using var request = new HttpRequestMessage(HttpMethod.Post, "https://api.github.com/graphql");
+        request.Content = requestContent;
+        request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", todoOptions.Token);
+        request.Headers.TryAddWithoutValidation("User-Agent", todoOptions.Username);
+
+        using var response = await httpClient.SendAsync(request);
+        var responseBody = await response.Content.ReadAsStringAsync();
+
+        _logger.LogInformation("GitHub server returned status code: {}", response.StatusCode);
+        _logger.LogInformation("GitHub server returned body: {}", responseBody);
+
+        if (response.IsSuccessStatusCode)
+        {
+            using var responseJson = JsonSerializer.Deserialize<JsonDocument>(responseBody);
+            if (responseJson is null)
+            {
+                throw new Exception("Fail to deserialize response body.");
+            }
+
+            var nodes = responseJson.RootElement.GetProperty("data").GetProperty("user").GetProperty("projectV2").GetProperty("items").GetProperty("nodes").EnumerateArray();
+
+            var result = new List<TodosItem>();
+
+            foreach (var node in nodes)
+            {
+                var content = node.GetProperty("content");
+                var title = content.GetProperty("title").GetString();
+                if (title is null)
+                {
+                    throw new Exception("Fail to get title.");
+                }
+                JsonElement closedElement;
+                bool closed;
+                if (content.TryGetProperty("closed", out closedElement))
+                {
+                    closed = closedElement.GetBoolean();
+                }
+                else
+                {
+                    closed = false;
+                }
+
+                result.Add(new TodosItem
+                {
+                    Title = title,
+                    Status = closed ? "Done" : "Todo",
+                    Closed = closed,
+                    Color = closed ? "green" : "blue"
+                });
+            }
+
+            return result;
+        }
+        else
+        {
+            const string message = "Fail to get todos from GitHub.";
+            _logger.LogError(message);
+            throw new Exception(message);
+        }
+    }
+}
diff --git a/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosServiceCollectionExtensions.cs b/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosServiceCollectionExtensions.cs
new file mode 100644
index 0000000..cdf174d
--- /dev/null
+++ b/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosServiceCollectionExtensions.cs
@@ -0,0 +1,22 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+
+namespace CrupestApi.Todos;
+
+public static class TodosServiceCollectionExtensions
+{
+    public static IServiceCollection AddTodos(this IServiceCollection services)
+    {
+        services.AddOptions<TodosConfiguration>().BindConfiguration("Todos");
+        services.PostConfigure<TodosConfiguration>(config =>
+        {
+            if (config.Count == 0)
+            {
+                config.Count = 20;
+            }
+        });
+        services.TryAddScoped<TodosService>();
+        return services;
+    }
+}
+
diff --git a/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosWebApplicationExtensions.cs b/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosWebApplicationExtensions.cs
new file mode 100644
index 0000000..575dc4f
--- /dev/null
+++ b/docker/crupest-api/CrupestApi/CrupestApi.Todos/TodosWebApplicationExtensions.cs
@@ -0,0 +1,41 @@
+using System;
+using System.Text.Json;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace CrupestApi.Todos;
+
+public static class TodosWebApplicationExtensions
+{
+    public static WebApplication MapTodos(this WebApplication app, string path)
+    {
+        if (app is null)
+        {
+            throw new ArgumentNullException(nameof(app));
+        }
+
+        app.MapGet(path, async ([FromServices] TodosService todosService) =>
+        {
+            var jsonOptions = new JsonSerializerOptions
+            {
+                PropertyNamingPolicy = JsonNamingPolicy.CamelCase
+            };
+
+            try
+            {
+                var todos = await todosService.GetTodosAsync();
+                return Results.Json(todos, jsonOptions, statusCode: 200);
+            }
+            catch (Exception e)
+            {
+                return Results.Json(new
+                {
+                    e.Message
+                }, jsonOptions, statusCode: StatusCodes.Status503ServiceUnavailable);
+            }
+        });
+
+        return app;
+    }
+}
+\ No newline at end of file