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/projects_test.go

@@ -0,0 +1,28 @@
+// Copyright 2020 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 (
+	"testing"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/test"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCheckProjectBoardChangePermissions(t *testing.T) {
+	models.PrepareTestEnv(t)
+	ctx := test.MockContext(t, "user2/repo1/projects/1/2")
+	test.LoadUser(t, ctx, 2)
+	test.LoadRepo(t, ctx, 1)
+	ctx.SetParams(":id", "1")
+	ctx.SetParams(":boardID", "2")
+
+	project, board := checkProjectBoardChangePermissions(ctx)
+	assert.NotNil(t, project)
+	assert.NotNil(t, board)
+	assert.False(t, ctx.Written())
+}