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/git_commits.go

@@ -0,0 +1,135 @@
+// 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"
+	"fmt"
+	"time"
+)
+
+// SignatureVerification represents GPG signature verification.
+type SignatureVerification struct {
+	Verified  *bool   `json:"verified,omitempty"`
+	Reason    *string `json:"reason,omitempty"`
+	Signature *string `json:"signature,omitempty"`
+	Payload   *string `json:"payload,omitempty"`
+}
+
+// Commit represents a GitHub commit.
+type Commit struct {
+	SHA          *string                `json:"sha,omitempty"`
+	Author       *CommitAuthor          `json:"author,omitempty"`
+	Committer    *CommitAuthor          `json:"committer,omitempty"`
+	Message      *string                `json:"message,omitempty"`
+	Tree         *Tree                  `json:"tree,omitempty"`
+	Parents      []Commit               `json:"parents,omitempty"`
+	Stats        *CommitStats           `json:"stats,omitempty"`
+	HTMLURL      *string                `json:"html_url,omitempty"`
+	URL          *string                `json:"url,omitempty"`
+	Verification *SignatureVerification `json:"verification,omitempty"`
+	NodeID       *string                `json:"node_id,omitempty"`
+
+	// CommentCount is the number of GitHub comments on the commit. This
+	// is only populated for requests that fetch GitHub data like
+	// Pulls.ListCommits, Repositories.ListCommits, etc.
+	CommentCount *int `json:"comment_count,omitempty"`
+}
+
+func (c Commit) String() string {
+	return Stringify(c)
+}
+
+// CommitAuthor represents the author or committer of a commit. The commit
+// author may not correspond to a GitHub User.
+type CommitAuthor struct {
+	Date  *time.Time `json:"date,omitempty"`
+	Name  *string    `json:"name,omitempty"`
+	Email *string    `json:"email,omitempty"`
+
+	// The following fields are only populated by Webhook events.
+	Login *string `json:"username,omitempty"` // Renamed for go-github consistency.
+}
+
+func (c CommitAuthor) String() string {
+	return Stringify(c)
+}
+
+// GetCommit fetches the Commit object for a given SHA.
+//
+// GitHub API docs: https://developer.github.com/v3/git/commits/#get-a-commit
+func (s *GitService) GetCommit(ctx context.Context, owner string, repo string, sha string) (*Commit, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/git/commits/%v", owner, repo, sha)
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	c := new(Commit)
+	resp, err := s.client.Do(ctx, req, c)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return c, resp, nil
+}
+
+// createCommit represents the body of a CreateCommit request.
+type createCommit struct {
+	Author    *CommitAuthor `json:"author,omitempty"`
+	Committer *CommitAuthor `json:"committer,omitempty"`
+	Message   *string       `json:"message,omitempty"`
+	Tree      *string       `json:"tree,omitempty"`
+	Parents   []string      `json:"parents,omitempty"`
+	Signature *string       `json:"signature,omitempty"`
+}
+
+// CreateCommit creates a new commit in a repository.
+// commit must not be nil.
+//
+// The commit.Committer is optional and will be filled with the commit.Author
+// data if omitted. If the commit.Author is omitted, it will be filled in with
+// the authenticated user’s information and the current date.
+//
+// GitHub API docs: https://developer.github.com/v3/git/commits/#create-a-commit
+func (s *GitService) CreateCommit(ctx context.Context, owner string, repo string, commit *Commit) (*Commit, *Response, error) {
+	if commit == nil {
+		return nil, nil, fmt.Errorf("commit must be provided")
+	}
+
+	u := fmt.Sprintf("repos/%v/%v/git/commits", owner, repo)
+
+	parents := make([]string, len(commit.Parents))
+	for i, parent := range commit.Parents {
+		parents[i] = *parent.SHA
+	}
+
+	body := &createCommit{
+		Author:    commit.Author,
+		Committer: commit.Committer,
+		Message:   commit.Message,
+		Parents:   parents,
+	}
+	if commit.Tree != nil {
+		body.Tree = commit.Tree.SHA
+	}
+	if commit.Verification != nil {
+		body.Signature = commit.Verification.Signature
+	}
+
+	req, err := s.client.NewRequest("POST", u, body)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	c := new(Commit)
+	resp, err := s.client.Do(ctx, req, c)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return c, resp, nil
+}