Improve migrations to support migrating milestones/labels/issues/comments/pullrequests (#6290)

* add migrations

* fix package dependency

* fix lints

* implements migrations except pull requests

* add releases

* migrating releases

* fix bug

* fix lint

* fix migrate releases

* fix tests

* add rollback

* pull request migtations

* fix import

* fix go module vendor

* add tests for upload to gitea

* more migrate options

* fix swagger-check

* fix misspell

* add options on migration UI

* fix log error

* improve UI options on migrating

* add support for username password when migrating from github

* fix tests

* remove comments and fix migrate limitation

* improve error handles

* migrate API will also support migrate milestones/labels/issues/pulls/releases

* fix tests and remove unused codes

* add DownloaderFactory and docs about how to create a new Downloader

* fix misspell

* fix migration docs

* Add hints about migrate options on migration page

* fix tests

vendor/github.com/google/go-github/v24/github/activity.go

@@ -0,0 +1,69 @@
+// Copyright 2013 The go-github AUTHORS. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package github
+
+import "context"
+
+// ActivityService handles communication with the activity related
+// methods of the GitHub API.
+//
+// GitHub API docs: https://developer.github.com/v3/activity/
+type ActivityService service
+
+// FeedLink represents a link to a related resource.
+type FeedLink struct {
+	HRef *string `json:"href,omitempty"`
+	Type *string `json:"type,omitempty"`
+}
+
+// Feeds represents timeline resources in Atom format.
+type Feeds struct {
+	TimelineURL                 *string  `json:"timeline_url,omitempty"`
+	UserURL                     *string  `json:"user_url,omitempty"`
+	CurrentUserPublicURL        *string  `json:"current_user_public_url,omitempty"`
+	CurrentUserURL              *string  `json:"current_user_url,omitempty"`
+	CurrentUserActorURL         *string  `json:"current_user_actor_url,omitempty"`
+	CurrentUserOrganizationURL  *string  `json:"current_user_organization_url,omitempty"`
+	CurrentUserOrganizationURLs []string `json:"current_user_organization_urls,omitempty"`
+	Links                       *struct {
+		Timeline                 *FeedLink  `json:"timeline,omitempty"`
+		User                     *FeedLink  `json:"user,omitempty"`
+		CurrentUserPublic        *FeedLink  `json:"current_user_public,omitempty"`
+		CurrentUser              *FeedLink  `json:"current_user,omitempty"`
+		CurrentUserActor         *FeedLink  `json:"current_user_actor,omitempty"`
+		CurrentUserOrganization  *FeedLink  `json:"current_user_organization,omitempty"`
+		CurrentUserOrganizations []FeedLink `json:"current_user_organizations,omitempty"`
+	} `json:"_links,omitempty"`
+}
+
+// ListFeeds lists all the feeds available to the authenticated user.
+//
+// GitHub provides several timeline resources in Atom format:
+//     Timeline: The GitHub global public timeline
+//     User: The public timeline for any user, using URI template
+//     Current user public: The public timeline for the authenticated user
+//     Current user: The private timeline for the authenticated user
+//     Current user actor: The private timeline for activity created by the
+//         authenticated user
+//     Current user organizations: The private timeline for the organizations
+//         the authenticated user is a member of.
+//
+// Note: Private feeds are only returned when authenticating via Basic Auth
+// since current feed URIs use the older, non revocable auth tokens.
+func (s *ActivityService) ListFeeds(ctx context.Context) (*Feeds, *Response, error) {
+	req, err := s.client.NewRequest("GET", "feeds", nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	f := &Feeds{}
+	resp, err := s.client.Do(ctx, req, f)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return f, resp, nil
+}