refactor(handler/http2): split handler into 3 focused files with 52 tests

Extract authenticate/probe-resistance to auth.go and roundTrip/forwarding to proxy.go, following the handler/http/ pattern. Export sentinel errors (ErrAuthFailed, ErrWrongConnType) for precise test assertions. Fix flushWriter panic recovery to handle non-string/non-error panics. Default HTTPS port to 443 when no port is specified in the Host header.
2026-05-30 18:01:19 +08:00
parent a33c6f4a92
commit 6ccaae0573
11 changed files with 1228 additions and 382 deletions
@@ -0,0 +1,146 @@
+package http2
+
+import (
+	"context"
+	"encoding/base64"
+	"fmt"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/go-gost/core/auth"
+	"github.com/go-gost/core/logger"
+)
+
+func (h *http2Handler) basicProxyAuth(proxyAuth string) (username, password string, ok bool) {
+	if proxyAuth == "" {
+		return
+	}
+
+	if !strings.HasPrefix(proxyAuth, "Basic ") {
+		return
+	}
+	c, err := base64.StdEncoding.DecodeString(strings.TrimPrefix(proxyAuth, "Basic "))
+	if err != nil {
+		return
+	}
+	cs := string(c)
+	s := strings.IndexByte(cs, ':')
+	if s < 0 {
+		return
+	}
+
+	return cs[:s], cs[s+1:], true
+}
+
+func (h *http2Handler) authenticate(ctx context.Context, w http.ResponseWriter, r *http.Request, resp *http.Response, log logger.Logger) (id string, ok bool) {
+	u, p, _ := h.basicProxyAuth(r.Header.Get("Proxy-Authorization"))
+	if h.options.Auther == nil {
+		return "", true
+	}
+	if id, ok = h.options.Auther.Authenticate(ctx, u, p, auth.WithService(h.options.Service)); ok {
+		return
+	}
+
+	pr := h.md.probeResistance
+	// probing resistance is enabled, and knocking host is mismatch.
+	if pr != nil && (pr.Knock == "" || !knockMatch(r.URL.Hostname(), pr.Knock)) {
+		resp.StatusCode = http.StatusServiceUnavailable // default status code
+		switch pr.Type {
+		case "code":
+			resp.StatusCode, _ = strconv.Atoi(pr.Value)
+		case "web":
+			url := pr.Value
+			if !strings.HasPrefix(url, "http") {
+				url = "http://" + url
+			}
+			req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+			if err != nil {
+				log.Error(err)
+				break
+			}
+			r, err := http.DefaultClient.Do(req)
+			if err != nil {
+				log.Error(err)
+				break
+			}
+			resp = r
+			defer resp.Body.Close()
+		case "host":
+			cc, err := net.Dial("tcp", pr.Value)
+			if err != nil {
+				log.Error(err)
+				break
+			}
+			defer cc.Close()
+
+			if err := h.forwardRequest(w, r, cc); err != nil {
+				log.Error(err)
+			}
+			return
+		case "file":
+			f, _ := os.Open(pr.Value)
+			if f != nil {
+				defer f.Close()
+
+				resp.StatusCode = http.StatusOK
+				if finfo, _ := f.Stat(); finfo != nil {
+					resp.ContentLength = finfo.Size()
+				}
+				resp.Header.Set("Content-Type", "text/html")
+				resp.Body = f
+			}
+		}
+	}
+
+	if resp.StatusCode == 0 {
+		realm := defaultRealm
+		if h.md.authBasicRealm != "" {
+			realm = h.md.authBasicRealm
+		}
+		resp.StatusCode = http.StatusProxyAuthRequired
+		resp.Header.Add("Proxy-Authenticate", fmt.Sprintf("Basic realm=\"%s\"", realm))
+		if strings.ToLower(r.Header.Get("Proxy-Connection")) == "keep-alive" {
+			// XXX libcurl will keep sending auth request in same conn
+			// which we don't supported yet.
+			resp.Header.Set("Connection", "close")
+			resp.Header.Set("Proxy-Connection", "close")
+		}
+
+		log.Debug("proxy authentication required")
+	} else {
+		resp.Header = http.Header{}
+		// resp.Header.Set("Server", "nginx/1.20.1")
+		// resp.Header.Set("Date", time.Now().Format(http.TimeFormat))
+		if resp.StatusCode == http.StatusOK {
+			resp.Header.Set("Connection", "keep-alive")
+		}
+	}
+
+	if log.IsLevelEnabled(logger.TraceLevel) {
+		dump, _ := httputil.DumpResponse(resp, false)
+		log.Trace(string(dump))
+	}
+
+	h.writeResponse(w, resp)
+
+	return
+}
+
+// knockMatch reports whether hostname matches any entry in the
+// comma-separated knock list. Matching is case-insensitive. An empty
+// knock string returns false (no match).
+func knockMatch(hostname, knock string) bool {
+	if knock == "" {
+		return false
+	}
+	for _, h := range strings.Split(knock, ",") {
+		if strings.EqualFold(hostname, strings.TrimSpace(h)) {
+			return true
+		}
+	}
+	return false
+}