fix(oauth): handle oauth2 error_description

auth/oauth/oauth.go

@@ -46,11 +46,14 @@ func (a *OAuth) Login() http.HandlerFunc {
 		}
 		// State contain the provider and the csrf token.
 		state := fmt.Sprintf("%s,%s", token, p)
+		authCodeURL := provider.AuthCodeURL(state)
+		fmt.Println(authCodeURL)
+
 		http.SetCookie(w, cookie)
 		http.Redirect(
 			w,
 			r,
-			provider.AuthCodeURL(state),
+			authCodeURL,
 			http.StatusFound,
 		)
 	}
@@ -82,6 +85,12 @@ func (a *OAuth) CallBack() http.HandlerFunc {
 			return
 		}
 
+		errorDescription := val.Get("error_description")
+		if errorDescription != "" {
+			http.Error(w, errorDescription, http.StatusUnauthorized)
+			return
+		}
+
 		expectedCSRF, err := r.Cookie("csrf_token")
 		if err == http.ErrNoCookie {
 			http.Error(w, "no csrf cookie error", http.StatusUnauthorized)
@@ -100,19 +109,19 @@ func (a *OAuth) CallBack() http.HandlerFunc {
 
 		oauth2Token, err := provider.Exchange(r.Context(), code)
 		if err != nil {
-			http.Error(w, err.Error(), http.StatusUnauthorized)
+			http.Error(w, fmt.Sprintf("exchange: %v", err), http.StatusUnauthorized)
 			return
 		}
 
 		userID, userName, err := provider.GetIdentity(r.Context(), oauth2Token)
 		if err != nil {
-			http.Error(w, err.Error(), http.StatusUnauthorized)
+			http.Error(w, fmt.Sprintf("id: %v", err), http.StatusUnauthorized)
 			return
 		}
 
 		token, err := a.JWTSecret.GenerateToken(userID, userName, strings.ToLower(p))
 		if err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
+			http.Error(w, fmt.Sprintf("gen token: %v", err), http.StatusInternalServerError)
 			return
 		}