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/web/repo/topic.go

@@ -0,0 +1,61 @@
+// Copyright 2018 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 repo
+
+import (
+	"net/http"
+	"strings"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/log"
+)
+
+// TopicsPost response for creating repository
+func TopicsPost(ctx *context.Context) {
+	if ctx.User == nil {
+		ctx.JSON(http.StatusForbidden, map[string]interface{}{
+			"message": "Only owners could change the topics.",
+		})
+		return
+	}
+
+	var topics = make([]string, 0)
+	var topicsStr = strings.TrimSpace(ctx.Query("topics"))
+	if len(topicsStr) > 0 {
+		topics = strings.Split(topicsStr, ",")
+	}
+
+	validTopics, invalidTopics := models.SanitizeAndValidateTopics(topics)
+
+	if len(validTopics) > 25 {
+		ctx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{
+			"invalidTopics": nil,
+			"message":       ctx.Tr("repo.topic.count_prompt"),
+		})
+		return
+	}
+
+	if len(invalidTopics) > 0 {
+		ctx.JSON(http.StatusUnprocessableEntity, map[string]interface{}{
+			"invalidTopics": invalidTopics,
+			"message":       ctx.Tr("repo.topic.format_prompt"),
+		})
+		return
+	}
+
+	err := models.SaveTopics(ctx.Repo.Repository.ID, validTopics...)
+	if err != nil {
+		log.Error("SaveTopics failed: %v", err)
+		ctx.JSON(http.StatusInternalServerError, map[string]interface{}{
+			"message": "Save topics failed.",
+		})
+		return
+	}
+
+	ctx.JSON(http.StatusOK, map[string]interface{}{
+		"status": "ok",
+	})
+}