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/repos_invitations.go

@@ -0,0 +1,89 @@
+// Copyright 2016 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"
+	"fmt"
+)
+
+// RepositoryInvitation represents an invitation to collaborate on a repo.
+type RepositoryInvitation struct {
+	ID      *int64      `json:"id,omitempty"`
+	Repo    *Repository `json:"repository,omitempty"`
+	Invitee *User       `json:"invitee,omitempty"`
+	Inviter *User       `json:"inviter,omitempty"`
+
+	// Permissions represents the permissions that the associated user will have
+	// on the repository. Possible values are: "read", "write", "admin".
+	Permissions *string    `json:"permissions,omitempty"`
+	CreatedAt   *Timestamp `json:"created_at,omitempty"`
+	URL         *string    `json:"url,omitempty"`
+	HTMLURL     *string    `json:"html_url,omitempty"`
+}
+
+// ListInvitations lists all currently-open repository invitations.
+//
+// GitHub API docs: https://developer.github.com/v3/repos/invitations/#list-invitations-for-a-repository
+func (s *RepositoriesService) ListInvitations(ctx context.Context, owner, repo string, opt *ListOptions) ([]*RepositoryInvitation, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/invitations", owner, repo)
+	u, err := addOptions(u, opt)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	invites := []*RepositoryInvitation{}
+	resp, err := s.client.Do(ctx, req, &invites)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return invites, resp, nil
+}
+
+// DeleteInvitation deletes a repository invitation.
+//
+// GitHub API docs: https://developer.github.com/v3/repos/invitations/#delete-a-repository-invitation
+func (s *RepositoriesService) DeleteInvitation(ctx context.Context, owner, repo string, invitationID int64) (*Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/invitations/%v", owner, repo, invitationID)
+	req, err := s.client.NewRequest("DELETE", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return s.client.Do(ctx, req, nil)
+}
+
+// UpdateInvitation updates the permissions associated with a repository
+// invitation.
+//
+// permissions represents the permissions that the associated user will have
+// on the repository. Possible values are: "read", "write", "admin".
+//
+// GitHub API docs: https://developer.github.com/v3/repos/invitations/#update-a-repository-invitation
+func (s *RepositoriesService) UpdateInvitation(ctx context.Context, owner, repo string, invitationID int64, permissions string) (*RepositoryInvitation, *Response, error) {
+	opts := &struct {
+		Permissions string `json:"permissions"`
+	}{Permissions: permissions}
+	u := fmt.Sprintf("repos/%v/%v/invitations/%v", owner, repo, invitationID)
+	req, err := s.client.NewRequest("PATCH", u, opts)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	invite := &RepositoryInvitation{}
+	resp, err := s.client.Do(ctx, req, invite)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return invite, resp, nil
+}