[API] Add notification endpoint (#9488)

* [API] Add notification endpoints

 * add func GetNotifications(opts FindNotificationOptions)
 * add func (n *Notification) APIFormat()
 * add func (nl NotificationList) APIFormat()
 * add func (n *Notification) APIURL()
 * add func (nl NotificationList) APIFormat()
 * add LoadAttributes functions (loadRepo, loadIssue, loadComment, loadUser)
 * add func (c *Comment) APIURL()
 * add func (issue *Issue) GetLastComment()
 * add endpoint GET /notifications
 * add endpoint PUT /notifications
 * add endpoint GET /repos/{owner}/{repo}/notifications
 * add endpoint PUT /repos/{owner}/{repo}/notifications
 * add endpoint GET /notifications/threads/{id}
 * add endpoint PATCH /notifications/threads/{id}

* Add TEST

* code format

* code format

1 files changed, 28 insertions, 0 deletions

diff --git a/modules/structs/notifications.go b/modules/structs/notifications.go
new file mode 100644
index 0000000000..b1e8b7781c
--- /dev/null
+++ b/modules/structs/notifications.go
@@ -0,0 +1,28 @@
+// Copyright 2019 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 structs
+
+import (
+	"time"
+)
+
+// NotificationThread expose Notification on API
+type NotificationThread struct {
+	ID         int64                `json:"id"`
+	Repository *Repository          `json:"repository"`
+	Subject    *NotificationSubject `json:"subject"`
+	Unread     bool                 `json:"unread"`
+	Pinned     bool                 `json:"pinned"`
+	UpdatedAt  time.Time            `json:"updated_at"`
+	URL        string               `json:"url"`
+}
+
+// NotificationSubject contains the notification subject (Issue/Pull/Commit)
+type NotificationSubject struct {
+	Title            string `json:"title"`
+	URL              string `json:"url"`
+	LatestCommentURL string `json:"latest_comment_url"`
+	Type             string `json:"type" binding:"In(Issue,Pull,Commit)"`
+}