Add activity feeds API (#23494)

Close #5666

Add APIs for getting activity feeds.

models/activities/action.go

@@ -66,6 +66,67 @@ const (
 	ActionAutoMergePullRequest                            // 27
 )
 
+func (at ActionType) String() string {
+	switch at {
+	case ActionCreateRepo:
+		return "create_repo"
+	case ActionRenameRepo:
+		return "rename_repo"
+	case ActionStarRepo:
+		return "star_repo"
+	case ActionWatchRepo:
+		return "watch_repo"
+	case ActionCommitRepo:
+		return "commit_repo"
+	case ActionCreateIssue:
+		return "create_issue"
+	case ActionCreatePullRequest:
+		return "create_pull_request"
+	case ActionTransferRepo:
+		return "transfer_repo"
+	case ActionPushTag:
+		return "push_tag"
+	case ActionCommentIssue:
+		return "comment_issue"
+	case ActionMergePullRequest:
+		return "merge_pull_request"
+	case ActionCloseIssue:
+		return "close_issue"
+	case ActionReopenIssue:
+		return "reopen_issue"
+	case ActionClosePullRequest:
+		return "close_pull_request"
+	case ActionReopenPullRequest:
+		return "reopen_pull_request"
+	case ActionDeleteTag:
+		return "delete_tag"
+	case ActionDeleteBranch:
+		return "delete_branch"
+	case ActionMirrorSyncPush:
+		return "mirror_sync_push"
+	case ActionMirrorSyncCreate:
+		return "mirror_sync_create"
+	case ActionMirrorSyncDelete:
+		return "mirror_sync_delete"
+	case ActionApprovePullRequest:
+		return "approve_pull_request"
+	case ActionRejectPullRequest:
+		return "reject_pull_request"
+	case ActionCommentPull:
+		return "comment_pull"
+	case ActionPublishRelease:
+		return "publish_release"
+	case ActionPullReviewDismissed:
+		return "pull_review_dismissed"
+	case ActionPullRequestReadyForReview:
+		return "pull_request_ready_for_review"
+	case ActionAutoMergePullRequest:
+		return "auto_merge_pull_request"
+	default:
+		return "action-" + strconv.Itoa(int(at))
+	}
+}
+
 // Action represents user operation type and other information to
 // repository. It implemented interface base.Actioner so that can be
 // used in template render.