Refactor routers directory (#15800)

* refactor routers directory

* move func used for web and api to common

* make corsHandler a function to prohibit side efects

* rm unused func

Co-authored-by: 6543 <6543@obermui.de>

routers/common/logger.go

@@ -0,0 +1,33 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package common
+
+import (
+	"net/http"
+	"time"
+
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/log"
+)
+
+// LoggerHandler is a handler that will log the routing to the default gitea log
+func LoggerHandler(level log.Level) func(next http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+			start := time.Now()
+
+			_ = log.GetLogger("router").Log(0, level, "Started %s %s for %s", log.ColoredMethod(req.Method), req.URL.RequestURI(), req.RemoteAddr)
+
+			next.ServeHTTP(w, req)
+
+			var status int
+			if v, ok := w.(context.ResponseWriter); ok {
+				status = v.Status()
+			}
+
+			_ = log.GetLogger("router").Log(0, level, "Completed %s %s %v %s in %v", log.ColoredMethod(req.Method), req.URL.RequestURI(), log.ColoredStatus(status), log.ColoredStatus(status, http.StatusText(status)), log.ColoredTime(time.Since(start)))
+		})
+	}
+}