1 files changed, 56 insertions, 0 deletions
diff --git a/routers/common/errpage.go b/routers/common/errpage.go
new file mode 100644
index 0000000..402ca44
--- /dev/null
+++ b/routers/common/errpage.go
@@ -0,0 +1,56 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package common
+
+import (
+	"fmt"
+	"net/http"
+
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/httpcache"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/templates"
+	"code.gitea.io/gitea/modules/web/middleware"
+	"code.gitea.io/gitea/modules/web/routing"
+	"code.gitea.io/gitea/services/context"
+)
+
+const tplStatus500 base.TplName = "status/500"
+
+// RenderPanicErrorPage renders a 500 page, and it never panics
+func RenderPanicErrorPage(w http.ResponseWriter, req *http.Request, err any) {
+	combinedErr := fmt.Sprintf("%v\n%s", err, log.Stack(2))
+	log.Error("PANIC: %s", combinedErr)
+
+	defer func() {
+		if err := recover(); err != nil {
+			log.Error("Panic occurs again when rendering error page: %v. Stack:\n%s", err, log.Stack(2))
+		}
+	}()
+
+	routing.UpdatePanicError(req.Context(), err)
+
+	httpcache.SetCacheControlInHeader(w.Header(), 0, "no-transform")
+	w.Header().Set(`X-Frame-Options`, setting.CORSConfig.XFrameOptions)
+
+	tmplCtx := context.TemplateContext{}
+	tmplCtx["Locale"] = middleware.Locale(w, req)
+	ctxData := middleware.GetContextData(req.Context())
+
+	// This recovery handler could be called without Gitea's web context, so we shouldn't touch that context too much.
+	// Otherwise, the 500-page may cause new panics, eg: cache.GetContextWithData, it makes the developer&users couldn't find the original panic.
+	user, _ := ctxData[middleware.ContextDataKeySignedUser].(*user_model.User)
+	if !setting.IsProd || (user != nil && user.IsAdmin) {
+		ctxData["ErrorMsg"] = "PANIC: " + combinedErr
+	}
+
+	err = templates.HTMLRenderer().HTML(w, http.StatusInternalServerError, string(tplStatus500), ctxData, tmplCtx)
+	if err != nil {
+		log.Error("Error occurs again when rendering error page: %v", err)
+		w.WriteHeader(http.StatusInternalServerError)
+		_, _ = w.Write([]byte("Internal server error, please collect error logs and report to Gitea issue tracker"))
+	}
+}