mirror of
https://github.com/WJQSERVER-STUDIO/ghproxy.git
synced 2026-02-03 00:01:10 +08:00
375 lines
12 KiB
Go
375 lines
12 KiB
Go
package proxy
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import (
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"bufio"
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"compress/gzip"
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"fmt"
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"ghproxy/config"
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"io"
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"net/http"
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"net/url"
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"regexp"
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"strings"
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"sync"
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"github.com/cloudwego/hertz/pkg/app"
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"github.com/cloudwego/hertz/pkg/protocol/http1/resp"
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"github.com/valyala/bytebufferpool"
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)
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// 定义错误类型, error承载描述, 便于处理
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type MatcherErrors struct {
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Code int
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Msg string
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Err error
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}
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var (
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ErrInvalidURL = &MatcherErrors{
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Code: 403,
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Msg: "Invalid URL Format",
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}
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ErrAuthHeaderUnavailable = &MatcherErrors{
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Code: 403,
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Msg: "AuthHeader Unavailable",
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}
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)
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func (e *MatcherErrors) Error() string {
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if e.Err != nil {
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return fmt.Sprintf("Code: %d, Msg: %s, Err: %s", e.Code, e.Msg, e.Err.Error())
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}
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return fmt.Sprintf("Code: %d, Msg: %s", e.Code, e.Msg)
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}
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func (e *MatcherErrors) Unwrap() error {
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return e.Err
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}
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func Matcher(rawPath string, cfg *config.Config) (string, string, string, error) {
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var (
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user string
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repo string
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matcher string
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)
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// 匹配 "https://github.com"开头的链接
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if strings.HasPrefix(rawPath, "https://github.com") {
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remainingPath := strings.TrimPrefix(rawPath, "https://github.com")
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if strings.HasPrefix(remainingPath, "/") {
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remainingPath = strings.TrimPrefix(remainingPath, "/")
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}
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// 预期格式/user/repo/more...
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// 取出user和repo和最后部分
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parts := strings.Split(remainingPath, "/")
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if len(parts) <= 2 {
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return "", "", "", ErrInvalidURL
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}
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user = parts[0]
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repo = parts[1]
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// 匹配 "https://github.com"开头的链接
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if len(parts) >= 3 {
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switch parts[2] {
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case "releases", "archive":
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matcher = "releases"
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case "blob", "raw":
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matcher = "blob"
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case "info", "git-upload-pack":
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matcher = "clone"
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default:
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return "", "", "", ErrInvalidURL
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}
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}
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return user, repo, matcher, nil
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}
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// 匹配 "https://raw"开头的链接
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if strings.HasPrefix(rawPath, "https://raw") {
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remainingPath := strings.TrimPrefix(rawPath, "https://")
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parts := strings.Split(remainingPath, "/")
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if len(parts) <= 3 {
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return "", "", "", ErrInvalidURL
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}
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user = parts[1]
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repo = parts[2]
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matcher = "raw"
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return user, repo, matcher, nil
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}
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// 匹配 "https://gist"开头的链接
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if strings.HasPrefix(rawPath, "https://gist") {
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remainingPath := strings.TrimPrefix(rawPath, "https://")
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parts := strings.Split(remainingPath, "/")
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if len(parts) <= 3 {
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return "", "", "", ErrInvalidURL
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}
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user = parts[1]
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repo = ""
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matcher = "gist"
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return user, repo, matcher, nil
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}
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// 匹配 "https://api.github.com/"开头的链接
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if strings.HasPrefix(rawPath, "https://api.github.com/") {
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matcher = "api"
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remainingPath := strings.TrimPrefix(rawPath, "https://api.github.com/")
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parts := strings.Split(remainingPath, "/")
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if parts[0] == "repos" {
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user = parts[1]
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repo = parts[2]
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}
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if parts[0] == "users" {
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user = parts[1]
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}
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if !cfg.Auth.ForceAllowApi {
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if cfg.Auth.AuthMethod != "header" || !cfg.Auth.Enabled {
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return "", "", "", ErrAuthHeaderUnavailable
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}
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}
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return user, repo, matcher, nil
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}
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return "", "", "", ErrInvalidURL
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}
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func EditorMatcher(rawPath string, cfg *config.Config) (bool, string, error) {
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var (
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matcher string
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)
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// 匹配 "https://github.com"开头的链接
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if strings.HasPrefix(rawPath, "https://github.com") {
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remainingPath := strings.TrimPrefix(rawPath, "https://github.com")
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if strings.HasPrefix(remainingPath, "/") {
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remainingPath = strings.TrimPrefix(remainingPath, "/")
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}
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return true, "", nil
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}
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// 匹配 "https://raw.githubusercontent.com"开头的链接
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if strings.HasPrefix(rawPath, "https://raw.githubusercontent.com") {
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return true, matcher, nil
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}
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// 匹配 "https://raw.github.com"开头的链接
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if strings.HasPrefix(rawPath, "https://raw.github.com") {
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return true, matcher, nil
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}
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// 匹配 "https://gist.githubusercontent.com"开头的链接
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if strings.HasPrefix(rawPath, "https://gist.githubusercontent.com") {
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return true, matcher, nil
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}
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// 匹配 "https://gist.github.com"开头的链接
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if strings.HasPrefix(rawPath, "https://gist.github.com") {
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return true, matcher, nil
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}
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// 匹配 "https://api.github.com/"开头的链接
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if strings.HasPrefix(rawPath, "https://api.github.com") {
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matcher = "api"
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return true, matcher, nil
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}
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return false, "", ErrInvalidURL
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}
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// 匹配文件扩展名是sh的rawPath
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func MatcherShell(rawPath string) bool {
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if strings.HasSuffix(rawPath, ".sh") {
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return true
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}
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return false
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}
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// LinkProcessor 是一个函数类型，用于处理提取到的链接。
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type LinkProcessor func(string) string
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// 自定义 URL 修改函数
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func modifyURL(url string, host string, cfg *config.Config) string {
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// 去除url内的https://或http://
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matched, _, err := EditorMatcher(url, cfg)
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if err != nil {
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logDump("Invalid URL: %s", url)
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return url
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}
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if matched {
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u := strings.TrimPrefix(url, "https://")
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u = strings.TrimPrefix(url, "http://")
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logDump("Modified URL: %s", "https://"+host+"/"+u)
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return "https://" + host + "/" + u
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}
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return url
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}
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var (
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matchedMatchers = []string{
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"blob",
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"raw",
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"gist",
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}
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)
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// matchString 检查目标字符串是否在给定的字符串集合中
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func matchString(target string, stringsToMatch []string) bool {
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matchMap := make(map[string]struct{}, len(stringsToMatch))
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for _, str := range stringsToMatch {
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matchMap[str] = struct{}{}
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}
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_, exists := matchMap[target]
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return exists
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}
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func ProcessLinksAndWriteChunked(input io.Reader, compress string, host string, cfg *config.Config, c *app.RequestContext) error {
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pr, pw := io.Pipe() // 创建一个管道，用于进程间通信
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var wg sync.WaitGroup
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wg.Add(2)
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var processErr error // 用于存储处理过程中发生的错误
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go func() {
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defer wg.Done() // 协程结束时通知 WaitGroup
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defer pw.Close() // 协程结束时关闭管道的写端
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var reader *bufio.Reader
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if compress == "gzip" { // 如果需要解压
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gzipReader, err := gzip.NewReader(input) // 创建 gzip 解压器
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if err != nil {
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c.String(http.StatusInternalServerError, fmt.Sprintf("gzip 解压错误: %v", err)) // 设置 HTTP 状态码和错误信息
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processErr = fmt.Errorf("gzip decompression error: %w", err) // gzip decompression error
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return
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}
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defer gzipReader.Close() // 延迟关闭 gzip 解压器
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reader = bufio.NewReader(gzipReader) // 使用 bufio 读取解压后的数据
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} else {
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reader = bufio.NewReader(input) // 直接使用 bufio 读取原始数据
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}
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var writer io.Writer = pw // 默认写入管道
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var gzipWriter *gzip.Writer
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if compress == "gzip" { // 如果需要压缩
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gzipWriter = gzip.NewWriter(writer) // 创建 gzip 压缩器
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writer = gzipWriter // 将 writer 设置为 gzip 压缩器
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defer func() { // 延迟关闭 gzip 压缩器
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if err := gzipWriter.Close(); err != nil {
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logError("gzipWriter close failed: %v", err)
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processErr = fmt.Errorf("gzipwriter close failed: %w", err) // gzipwriter close failed
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}
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}()
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}
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urlPattern := regexp.MustCompile(`https?://[^\s'"]+`) // 编译正则表达式，用于匹配 URL
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scanner := bufio.NewScanner(reader) // 创建 scanner 用于逐行扫描
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for scanner.Scan() { // 循环读取每一行
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line := scanner.Text() // 获取当前行
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modifiedLine := urlPattern.ReplaceAllStringFunc(line, func(originalURL string) string { // 替换 URL
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return modifyURL(originalURL, host, cfg) // 调用 modifyURL 函数修改 URL
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})
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modifiedLineWithNewline := modifiedLine + "\n" // 添加换行符
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_, err := writer.Write([]byte(modifiedLineWithNewline)) // 将修改后的行写入管道/gzip
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if err != nil {
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logError("写入 pipe 错误: %v", err) // 记录错误
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processErr = fmt.Errorf("write to pipe error: %w", err) // write to pipe error
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return
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}
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}
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if err := scanner.Err(); err != nil {
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logError("读取输入错误: %v", err) // 记录错误
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c.String(http.StatusInternalServerError, fmt.Sprintf("读取输入错误: %v", err)) // 设置 HTTP 状态码和错误信息
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processErr = fmt.Errorf("read input error: %w", err) // read input error
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return
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}
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}()
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go func() {
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defer wg.Done() // 协程结束时通知 WaitGroup
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c.Response.HijackWriter(resp.NewChunkedBodyWriter(&c.Response, c.GetWriter())) // 劫持 writer，启用分块编码
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bufWrapper := bytebufferpool.Get() // 从对象池获取 bytebuffer
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buf := bufWrapper.B
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size := 32768 // 32KB, 设置缓冲区大小
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buf = buf[:cap(buf)]
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if len(buf) < size {
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buf = append(buf, make([]byte, size-len(buf))...)
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}
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buf = buf[:size] // 将缓冲区限制为 'size'
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defer bytebufferpool.Put(bufWrapper) // 延迟将 bytebuffer 放回对象池
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for { // 循环读取和写入数据
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n, err := pr.Read(buf) // 从管道读取数据
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if err != nil {
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if err == io.EOF { // 如果读取到文件末尾
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if n > 0 { // 确保写入所有剩余数据
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_, err := c.Write(buf[:n]) // 写入最后的数据块
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if err != nil {
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processErr = fmt.Errorf("failed to write final chunk: %w", err) // failed to write final chunk
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break
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}
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}
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c.Flush() // 刷新缓冲区
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break // 读取到文件末尾, 退出循环
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}
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logError("hwriter.Writer read error: %v", err) // 记录错误
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if processErr == nil {
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processErr = fmt.Errorf("failed to read from pipe: %w", err) // failed to read from pipe
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// 不要在这里设置 http status code. 如果 read 失败, process 协程可能还没有完成, 它可能正在尝试设置 status code. 两个地方都设置会导致 race condition.
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}
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break // 读取错误，退出循环
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}
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if n > 0 { // 只有在实际读取到数据时才写入
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_, err = c.Write(buf[:n]) // 将数据写入响应
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if err != nil {
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// 处理写入错误 (考虑记录日志并可能中止)
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logError("hwriter.Writer write error: %v", err)
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if processErr == nil { // 仅当 processErr 尚未设置时才设置.
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processErr = fmt.Errorf("failed to write chunk: %w", err) // failed to write chunk
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}
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break // 写入错误, 退出循环
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}
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// 在大多数情况下，考虑移除 Flush. 仅在 *真正* 需要时保留它。
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if err := c.Flush(); err != nil {
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// 更强大的 Flush() 错误处理
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c.AbortWithStatus(http.StatusInternalServerError) // 中止响应
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logError("hwriter.Writer flush error: %v", err)
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if processErr == nil {
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processErr = fmt.Errorf("failed to flush chunk: %w", err) // failed to flush chunk
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}
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break // 刷新错误, 退出循环
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}
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}
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}
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}()
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wg.Wait() // 等待两个协程结束
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return processErr // 返回错误
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}
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// extractParts 从给定的 URL 中提取所需的部分
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func extractParts(rawURL string) (string, string, string, url.Values, error) {
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// 解析 URL
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parsedURL, err := url.Parse(rawURL)
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if err != nil {
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return "", "", "", nil, err
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}
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// 获取路径部分并分割
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pathParts := strings.Split(parsedURL.Path, "/")
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// 提取所需的部分
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if len(pathParts) < 3 {
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return "", "", "", nil, fmt.Errorf("URL path is too short")
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}
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// 提取 /WJQSERVER-STUDIO 和 /go-utils.git
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repoOwner := "/" + pathParts[1]
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repoName := "/" + pathParts[2]
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// 剩余部分
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remainingPath := strings.Join(pathParts[3:], "/")
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if remainingPath != "" {
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remainingPath = "/" + remainingPath
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}
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// 查询参数
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queryParams := parsedURL.Query()
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return repoOwner, repoName, remainingPath, queryParams, nil
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}
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