fix gitea oauth

internal/app/auth.go

@@ -5,6 +5,7 @@ import (
 	"database/sql"
 	"encoding/json"
 	"fmt"
+	"log"
 	"net/http"
 	"net/url"
 	"strings"
@@ -90,6 +91,7 @@ func (s *Server) handleCallback(w http.ResponseWriter, r *http.Request) {
 
 	user, err := s.exchangeOAuthCode(r.Context(), code)
 	if err != nil {
+		log.Printf("Gitea OAuth code exchange failed: %v", err)
 		http.Error(w, "Gitea sign-in failed", http.StatusBadGateway)
 		return
 	}
@@ -154,7 +156,7 @@ func (s *Server) exchangeOAuthCode(ctx context.Context, code string) (giteaUser,
 	request, err := http.NewRequestWithContext(
 		ctx,
 		http.MethodPost,
-		joinURL(s.cfg.GiteaURL, "/login/oauth/access_token"),
+		joinURL(s.cfg.GiteaInternalURL, "/login/oauth/access_token"),
 		strings.NewReader(form.Encode()),
 	)
 	if err != nil {
@@ -181,7 +183,7 @@ func (s *Server) exchangeOAuthCode(ctx context.Context, code string) (giteaUser,
 	request, err = http.NewRequestWithContext(
 		ctx,
 		http.MethodGet,
-		joinURL(s.cfg.GiteaURL, "/api/v1/user"),
+		joinURL(s.cfg.GiteaInternalURL, "/api/v1/user"),
 		nil,
 	)
 	if err != nil {