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/users_blocking.go

@@ -0,0 +1,91 @@
+// Copyright 2017 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"
+)
+
+// ListBlockedUsers lists all the blocked users by the authenticated user.
+//
+// GitHub API docs: https://developer.github.com/v3/users/blocking/#list-blocked-users
+func (s *UsersService) ListBlockedUsers(ctx context.Context, opt *ListOptions) ([]*User, *Response, error) {
+	u := "user/blocks"
+	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
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeBlockUsersPreview)
+
+	var blockedUsers []*User
+	resp, err := s.client.Do(ctx, req, &blockedUsers)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return blockedUsers, resp, nil
+}
+
+// IsBlocked reports whether specified user is blocked by the authenticated user.
+//
+// GitHub API docs: https://developer.github.com/v3/users/blocking/#check-whether-youve-blocked-a-user
+func (s *UsersService) IsBlocked(ctx context.Context, user string) (bool, *Response, error) {
+	u := fmt.Sprintf("user/blocks/%v", user)
+
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return false, nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeBlockUsersPreview)
+
+	resp, err := s.client.Do(ctx, req, nil)
+	isBlocked, err := parseBoolResponse(err)
+	return isBlocked, resp, err
+}
+
+// BlockUser blocks specified user for the authenticated user.
+//
+// GitHub API docs: https://developer.github.com/v3/users/blocking/#block-a-user
+func (s *UsersService) BlockUser(ctx context.Context, user string) (*Response, error) {
+	u := fmt.Sprintf("user/blocks/%v", user)
+
+	req, err := s.client.NewRequest("PUT", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeBlockUsersPreview)
+
+	return s.client.Do(ctx, req, nil)
+}
+
+// UnblockUser unblocks specified user for the authenticated user.
+//
+// GitHub API docs: https://developer.github.com/v3/users/blocking/#unblock-a-user
+func (s *UsersService) UnblockUser(ctx context.Context, user string) (*Response, error) {
+	u := fmt.Sprintf("user/blocks/%v", user)
+
+	req, err := s.client.NewRequest("DELETE", u, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: remove custom Accept header when this API fully launches.
+	req.Header.Set("Accept", mediaTypeBlockUsersPreview)
+
+	return s.client.Do(ctx, req, nil)
+}