adding gitea service

Mindforge.API/Services/GiteaService.cs

@@ -0,0 +1,165 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using Microsoft.Extensions.Configuration;
+using Mindforge.API.Exceptions;
+using Mindforge.API.Models;
+using Mindforge.API.Services.Interfaces;
+
+namespace Mindforge.API.Services
+{
+    public class GiteaService : IGiteaService
+    {
+        private readonly HttpClient _httpClient;
+        private readonly string _baseUrl;
+        private readonly string _owner;
+        private readonly string _repo;
+        private readonly string _token;
+
+        private static readonly JsonSerializerOptions JsonOptions = new()
+        {
+            PropertyNameCaseInsensitive = true
+        };
+
+        public GiteaService(HttpClient httpClient, IConfiguration configuration)
+        {
+            _httpClient = httpClient;
+
+            var repoUrl = configuration["GITEA_REPO_URL"];
+            if (string.IsNullOrEmpty(repoUrl))
+                throw new InvalidOperationException("GITEA_REPO_URL is not set in configuration.");
+
+            _token = configuration["GITEA_ACCESS_TOKEN"]
+                ?? throw new InvalidOperationException("GITEA_ACCESS_TOKEN is not set in configuration.");
+
+            // Parse: https://host/owner/repo or https://host/owner/repo.git
+            var normalizedUrl = repoUrl.TrimEnd('/').TrimEnd(".git".ToCharArray());
+            var uri = new Uri(normalizedUrl);
+            _baseUrl = $"{uri.Scheme}://{uri.Host}{(uri.IsDefaultPort ? "" : $":{uri.Port}")}";
+            var parts = uri.AbsolutePath.Trim('/').Split('/');
+            _owner = parts[0];
+            _repo = parts[1];
+        }
+
+        public string GetRepositoryName() => _repo;
+
+        public async Task<List<FileTreeNode>> GetFileTreeAsync()
+        {
+            // Get the master branch to obtain the latest commit SHA
+            var branchJson = await GetApiAsync($"/api/v1/repos/{_owner}/{_repo}/branches/master");
+            var branch = JsonSerializer.Deserialize<GiteaBranch>(branchJson, JsonOptions)
+                ?? throw new InvalidOperationException("Failed to parse branch response from Gitea.");
+
+            var treeSha = branch.Commit.Id;
+
+            // Fetch the full recursive tree
+            var treeJson = await GetApiAsync($"/api/v1/repos/{_owner}/{_repo}/git/trees/{treeSha}?recursive=true");
+            var treeResponse = JsonSerializer.Deserialize<GiteaTreeResponse>(treeJson, JsonOptions)
+                ?? throw new InvalidOperationException("Failed to parse tree response from Gitea.");
+
+            return BuildTree(treeResponse.Tree);
+        }
+
+        public async Task<string> GetFileContentAsync(string path)
+        {
+            var request = new HttpRequestMessage(HttpMethod.Get,
+                $"{_baseUrl}/api/v1/repos/{_owner}/{_repo}/raw/{path}?ref=master");
+            request.Headers.Add("Authorization", $"token {_token}");
+
+            var response = await _httpClient.SendAsync(request);
+            if (response.StatusCode == System.Net.HttpStatusCode.NotFound)
+                throw new UserException($"File not found in repository: {path}");
+
+            response.EnsureSuccessStatusCode();
+            return await response.Content.ReadAsStringAsync();
+        }
+
+        private async Task<string> GetApiAsync(string endpoint)
+        {
+            var request = new HttpRequestMessage(HttpMethod.Get, $"{_baseUrl}{endpoint}");
+            request.Headers.Add("Authorization", $"token {_token}");
+            var response = await _httpClient.SendAsync(request);
+            response.EnsureSuccessStatusCode();
+            return await response.Content.ReadAsStringAsync();
+        }
+
+        private static List<FileTreeNode> BuildTree(List<GiteaTreeItem> items)
+        {
+            var root = new List<FileTreeNode>();
+            var folderMap = new Dictionary<string, FileTreeNode>();
+
+            // Only include .md files and their parent folders
+            var mdFiles = items.Where(i => i.Type == "blob" && i.Path.EndsWith(".md")).ToList();
+            var neededFolders = new HashSet<string>();
+            foreach (var file in mdFiles)
+            {
+                var dir = System.IO.Path.GetDirectoryName(file.Path)?.Replace('\\', '/');
+                while (!string.IsNullOrEmpty(dir))
+                {
+                    neededFolders.Add(dir);
+                    dir = System.IO.Path.GetDirectoryName(dir)?.Replace('\\', '/');
+                }
+            }
+
+            // Create folder nodes
+            foreach (var item in items.Where(i => i.Type == "tree" && neededFolders.Contains(i.Path)).OrderBy(i => i.Path))
+            {
+                var node = new FileTreeNode
+                {
+                    Name = System.IO.Path.GetFileName(item.Path),
+                    Path = item.Path,
+                    Type = "folder",
+                    Children = []
+                };
+                folderMap[item.Path] = node;
+            }
+
+            // Place file and folder nodes into parent
+            var allNodes = mdFiles.Select(i => new FileTreeNode
+            {
+                Name = System.IO.Path.GetFileName(i.Path),
+                Path = i.Path,
+                Type = "file"
+            }).Concat(folderMap.Values).OrderBy(n => n.Path);
+
+            foreach (var node in allNodes)
+            {
+                var parentPath = System.IO.Path.GetDirectoryName(node.Path)?.Replace('\\', '/');
+                if (string.IsNullOrEmpty(parentPath))
+                    root.Add(node);
+                else if (folderMap.TryGetValue(parentPath, out var parent))
+                    parent.Children!.Add(node);
+            }
+
+            return root;
+        }
+
+        // ---- Gitea API DTOs ----
+
+        private class GiteaBranch
+        {
+            [JsonPropertyName("commit")]
+            public GiteaCommit Commit { get; set; } = new();
+        }
+
+        private class GiteaCommit
+        {
+            [JsonPropertyName("id")]
+            public string Id { get; set; } = "";
+        }
+
+        private class GiteaTreeResponse
+        {
+            [JsonPropertyName("tree")]
+            public List<GiteaTreeItem> Tree { get; set; } = [];
+        }
+
+        private class GiteaTreeItem
+        {
+            [JsonPropertyName("path")]
+            public string Path { get; set; } = "";
+
+            [JsonPropertyName("type")]
+            public string Type { get; set; } = ""; // "blob" | "tree"
+        }
+    }
+}

Mindforge.API/Services/Interfaces/IGiteaService.cs

@@ -0,0 +1,11 @@
+using Mindforge.API.Models;
+
+namespace Mindforge.API.Services.Interfaces
+{
+    public interface IGiteaService
+    {
+        Task<List<FileTreeNode>> GetFileTreeAsync();
+        Task<string> GetFileContentAsync(string path);
+        string GetRepositoryName();
+    }
+}