Files
gitea-mcp/Auth/JwtBearerSetup.cs
zhengchen.tao c7fa6aeb7f
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gitea-mcp: 初次落地 Gitea MCP Server (.NET 10, V1 only-read)
把 Gitea (git.zhengchentao.win) 通过 MCP 暴露给 Claude.ai:列 repo、读代码、看 commits / issues / PR / orgs / packages / actions。
设计文档见 vault Coding/gitea-mcp/gitea-mcp 设计.md。
代码模板复用 obsidian-mcp(.NET 10 + ModelContextProtocol SDK + JwtBearer)。

19 个只读 Tool(全部 scope=read:gitea):

Repo / 文件:
- list_repos / read_repo
- list_tree(max_entries=500 防爆)
- read_file(max_bytes=1MB,超出 truncated=true)
- search_code(走 /repos/search-code,indexer 未启用时返回结构化错误说明)

分支 / 提交:
- list_branches / list_commits / read_commit(diff 文件数限 50)

Issue / PR:
- list_issues / read_issue(含评论)
- list_pulls / read_pull(含评论 + 改动文件列表)

Org / Package(用户额外授权 read:organization + read:package):
- list_orgs / read_org
- list_packages / read_package

Gitea Actions(运维友好):
- list_workflow_runs / read_run_log

技术栈:
- .NET 10 + ModelContextProtocol SDK 1.0
- HttpClientFactory + Microsoft.Extensions.Http.Resilience(指数 backoff,5xx/429/网络错误重试)
- JwtBearer (HS256, Current+Previous fallback, MapInboundClaims=false)
- aud=gitea, scope=read:gitea, iss=https://auth.zhengchentao.win

Gitea API client:
- Authorization: token <PAT> (admin PAT,仅 read scope)
- BaseUrl=https://git.zhengchentao.win
- 错误映射:401/403 → UnauthorizedAccessException,404 → KeyNotFoundException,5xx → InvalidOperationException
- RepoBlacklist 黑名单(owner/repo 精确匹配,默认空)

部署:
- Dockerfile multi-stage,COPY --chown,non-root user
- .gitea/workflows/build-image.yml:build + deploy 双 job,buildkit v0.13.2
- 容器内 :8080,宿主端口 9092
- 子域名 git-mcp.zhengchentao.win(区别于 Gitea 本体 git.zhengchentao.win)

测试:6/6 单测过(GiteaRepoFilter 黑名单匹配)

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-06 01:32:42 +08:00

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using GiteaMcp.Config;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using System.Text;
namespace GiteaMcp.Auth;
/// <summary>
/// JWT Bearer 验签配置,与 obsidian-mcp 同款 HS256 对称密钥方案。
/// ValidIssuer = https://auth.zhengchentao.winValidAudience = gitea。
/// 支持 Current + Previous 双密钥(轮换窗口)。
/// </summary>
public static class JwtBearerSetup
{
public static IServiceCollection AddGiteaJwtBearer(
this IServiceCollection services,
IConfiguration configuration)
{
var jwtOpts = configuration.GetSection(JwtOptions.SectionName).Get<JwtOptions>()
?? new JwtOptions();
services
.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
.AddJwtBearer(options =>
{
// 关闭默认的入站 claim type 映射,否则 "sub"/"scope" 会被改写成
// ClaimTypes.NameIdentifier 之类的长 URI,下游 FindFirst("scope") 取不到。
options.MapInboundClaims = false;
options.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuer = true,
ValidIssuer = jwtOpts.Issuer,
ValidateAudience = true,
ValidAudience = jwtOpts.Audience,
ValidateIssuerSigningKey = true,
// ToList 物化一次,避免每次验签重建 SymmetricSecurityKey。
IssuerSigningKeys = BuildSigningKeys(jwtOpts).ToList(),
ValidateLifetime = true,
// nas-auth 设计里允许 2 分钟时钟偏差
ClockSkew = TimeSpan.FromMinutes(2),
};
});
return services;
}
/// <summary>
/// 构建 Current + Previous 双密钥列表,供 SDK 依次尝试验签。
/// 轮换期间两把钥匙同时有效,过期的旧 Token 会被 ValidateLifetime 自然拦截。
/// Current 未配置直接抛错,避免容器静默以"任何 token 都不通过"的状态运行。
/// </summary>
private static IEnumerable<SecurityKey> BuildSigningKeys(JwtOptions opts)
{
if (string.IsNullOrWhiteSpace(opts.SigningKeyCurrent))
throw new InvalidOperationException(
"Jwt:SigningKeyCurrent 未配置,gitea-mcp 无法启动。" +
"请在 .env.shared 设置 JWT_SIGNING_KEY_CURRENT 与 nas-auth 共用。");
yield return new SymmetricSecurityKey(Encoding.UTF8.GetBytes(opts.SigningKeyCurrent));
if (!string.IsNullOrWhiteSpace(opts.SigningKeyPrevious))
yield return new SymmetricSecurityKey(Encoding.UTF8.GetBytes(opts.SigningKeyPrevious));
}
}