ghproxy/proxy/handler.go

package proxy

import (
	"context"
	"errors"
	"fmt"
	"ghproxy/auth"
	"ghproxy/config"
	"ghproxy/rate"
	"net/http"
	"regexp"
	"strings"

	"github.com/cloudwego/hertz/pkg/app"
	"github.com/gin-gonic/gin"
)

var re = regexp.MustCompile(`^(http:|https:)?/?/?(.*)`) // 匹配http://或https://开头的路径

func NoRouteHandler(cfg *config.Config, limiter *rate.RateLimiter, iplimiter *rate.IPRateLimiter, runMode string) app.HandlerFunc {
	return func(ctx context.Context, c *app.RequestContext) {

		// 限制访问频率
		if cfg.RateLimit.Enabled {

			var allowed bool

			switch cfg.RateLimit.RateMethod {
			case "ip":
				allowed = iplimiter.Allow(c.ClientIP())
			case "total":
				allowed = limiter.Allow()
			default:
				logWarning("Invalid RateLimit Method")
				return
			}

			if !allowed {
				c.JSON(http.StatusTooManyRequests, gin.H{"error": "Too Many Requests"})
				logWarning("%s %s %s %s %s 429-TooManyRequests", c.ClientIP(), c.Request.Method, c.Request.RequestURI(), c.Request.Header.UserAgent(), c.Request.Header.GetProtocol())
				return
			}
		}

		//rawPath := strings.TrimPrefix(c.Request.URL.Path, "/") // 去掉前缀/
		rawPath := strings.TrimPrefix(string(c.Request.RequestURI()), "/") // 去掉前缀/
		matches := re.FindStringSubmatch(rawPath)                          // 匹配路径
		logInfo("Matches: %v", matches)

		// 匹配路径错误处理
		if len(matches) < 3 {
			errMsg := fmt.Sprintf("%s %s %s %s %s Invalid URL", c.ClientIP(), c.Request.Method, rawPath, c.Request.Header.UserAgent(), c.Request.Header.GetProtocol())
			logWarning(errMsg)
			c.String(http.StatusForbidden, "Invalid URL Format. Path: %s", rawPath)
			return
		}

		// 制作url
		rawPath = "https://" + matches[2]

		user, repo, matcher, err := Matcher(rawPath, cfg)
		if err != nil {
			if errors.Is(err, ErrInvalidURL) {
				c.String(http.StatusForbidden, "Invalid URL Format. Path: %s", rawPath)
				logWarning(err.Error())
				return
			}
			if errors.Is(err, ErrAuthHeaderUnavailable) {
				c.String(http.StatusForbidden, "AuthHeader Unavailable")
				logWarning(err.Error())
				return
			}
		}
		username := user

		logInfo("%s %s %s %s %s Matched-Username: %s, Matched-Repo: %s", c.ClientIP(), c.Request.Method, rawPath, c.Request.Header.UserAgent(), c.Request.Header.GetProtocol(), username, repo)
		// dump log 记录详细信息 c.ClientIP(), c.Request.Method, rawPath,c.Request.Header.UserAgent(), c.Request.Header.GetProtocol(), full Header
		logDump("%s %s %s %s %s %s", c.ClientIP(), c.Request.Method, rawPath, c.Request.Header.UserAgent(), c.Request.Header.GetProtocol(), c.Request.Header)
		repouser := fmt.Sprintf("%s/%s", username, repo)

		// 白名单检查
		if cfg.Whitelist.Enabled {
			whitelist := auth.CheckWhitelist(username, repo)
			if !whitelist {
				logErrMsg := fmt.Sprintf("%s %s %s %s %s Whitelist Blocked repo: %s", c.ClientIP(), c.Request.Method, rawPath, c.Request.Header.UserAgent(), c.Request.Header.GetProtocol(), repouser)
				errMsg := fmt.Sprintf("Whitelist Blocked repo: %s", repouser)
				c.JSON(http.StatusForbidden, gin.H{"error": errMsg})
				logWarning(logErrMsg)
				return
			}
		}

		// 黑名单检查
		if cfg.Blacklist.Enabled {
			blacklist := auth.CheckBlacklist(username, repo)
			if blacklist {
				logErrMsg := fmt.Sprintf("%s %s %s %s %s Blacklist Blocked repo: %s", c.ClientIP(), c.Request.Method, rawPath, c.Request.Header.UserAgent(), c.Request.Header.GetProtocol(), repouser)
				errMsg := fmt.Sprintf("Blacklist Blocked repo: %s", repouser)
				c.JSON(http.StatusForbidden, gin.H{"error": errMsg})
				logWarning(logErrMsg)
				return
			}
		}

		/*
			matches = CheckURL(rawPath, c)
			if matches == nil {
				c.AbortWithStatus(http.StatusNotFound)
				logWarning("%s %s %s %s %s 404-NOMATCH", c.ClientIP(), c.Request.Method, rawPath,c.Request.Header.UserAgent(), c.Request.Header.GetProtocol())
				return
			}
		*/

		// 若匹配api.github.com/repos/用户名/仓库名/路径, 则检查是否开启HeaderAuth

		// 处理blob/raw路径
		if matcher == "blob" {
			rawPath = strings.Replace(rawPath, "/blob/", "/raw/", 1)
		}

		// 鉴权
		var authcheck bool
		authcheck, err = auth.AuthHandler(ctx, c, cfg)
		if !authcheck {
			c.AbortWithStatusJSON(401, gin.H{"error": "Unauthorized"})
			logWarning("%s %s %s %s %s Auth-Error: %v", c.ClientIP(), c.Request.Method, rawPath, c.Request.Header.UserAgent(), c.Request.Header.GetProtocol(), err)
			return
		}

		// IP METHOD URL USERAGENT PROTO MATCHES
		logDebug("%s %s %s %s %s Matches: %v", c.ClientIP(), c.Request.Method, rawPath, c.Request.Header.UserAgent(), c.Request.Header.GetProtocol(), matches)

		switch matcher {
		case "releases", "blob", "raw", "gist", "api":
			ChunkedProxyRequest(ctx, c, rawPath, cfg, matcher)
		case "clone":
			//ProxyRequest(c, rawPath, cfg, "git", runMode)
			GitReq(ctx, c, rawPath, cfg, "git", runMode)
		default:
			c.String(http.StatusForbidden, "Invalid input.")
			fmt.Println("Invalid input.")
			return
		}
	}
}

/*
func CheckURL(u string, c *gin.Context) []string {
	for _, exp := range exps {
		if matches := exp.FindStringSubmatch(u); matches != nil {
			return matches[1:]
		}
	}
	errMsg := fmt.Sprintf("%s %s %s %s %s Invalid URL", c.ClientIP(), c.Request.Method, u,c.Request.Header.UserAgent(), c.Request.Header.GetProtocol())
	logError(errMsg)
	return nil
}
*/