feat: Improve Gitea-compatible forge migrations, fix many migration bugs (#39424)

Supports migrating from Gitea-compatible forges like Forgejo and fixes
many migration bugs.

1. Pre-release and `+gitea-` suffixed server versions no longer drop
reviews, reactions and pagination.
2. Review states, dismissals, scoped and archived labels and merge bases
are migrated.
3. Disabled units, external trackers, unavailable release assets, and
GitLab confidential issues and internal notes are skipped.
4. Credentials are only sent to the source host, and `Retry-After` rate
limits are waited out.
5. GitHub migrations of only issues or pull requests, basic auth clones
and dismissed reviews work again.
6. The API returns 404 for releases of a disabled unit and shows
migrated authors as mannequins, replacing the never populated
`original_author` and `original_author_id` fields.

Fixes: https://github.com/go-gitea/gitea/issues/19533
Fixes: https://github.com/go-gitea/gitea/issues/35885
Fixes: https://github.com/go-gitea/gitea/issues/18275
Fixes: https://github.com/go-gitea/gitea/issues/35069
Fixes: https://github.com/go-gitea/gitea/issues/17763
Fixes: https://github.com/go-gitea/gitea/issues/39548
Co-authored-by: bircni <bircni@icloud.com>

modules/structs/issue.go

@@ -49,20 +49,18 @@ type RepositoryMeta struct {
 // Issue represents an issue in a repository
 // swagger:model
 type Issue struct {
-	ID               int64         `json:"id"`
-	URL              string        `json:"url"`
-	HTMLURL          string        `json:"html_url"`
-	Index            int64         `json:"number"`
-	Poster           *User         `json:"user"`
-	OriginalAuthor   string        `json:"original_author"`
-	OriginalAuthorID int64         `json:"original_author_id"`
-	Title            string        `json:"title"`
-	Body             string        `json:"body"`
-	Ref              string        `json:"ref"`
-	Attachments      []*Attachment `json:"assets"`
-	Labels           []*Label      `json:"labels"`
-	Milestone        *Milestone    `json:"milestone"`
-	Projects         []*Project    `json:"projects"`
+	ID          int64         `json:"id"`
+	URL         string        `json:"url"`
+	HTMLURL     string        `json:"html_url"`
+	Index       int64         `json:"number"`
+	Poster      *User         `json:"user"`
+	Title       string        `json:"title"`
+	Body        string        `json:"body"`
+	Ref         string        `json:"ref"`
+	Attachments []*Attachment `json:"assets"`
+	Labels      []*Label      `json:"labels"`
+	Milestone   *Milestone    `json:"milestone"`
+	Projects    []*Project    `json:"projects"`
 	// deprecated
 	Assignee  *User     `json:"assignee"`
 	Assignees []*User   `json:"assignees"`

modules/structs/issue_comment.go

@@ -19,10 +19,6 @@ type Comment struct {
 	IssueURL string `json:"issue_url"`
 	// Poster is the user who posted the comment
 	Poster *User `json:"user"`
-	// OriginalAuthor is the original author name (for imported comments)
-	OriginalAuthor string `json:"original_author"`
-	// OriginalAuthorID is the original author ID (for imported comments)
-	OriginalAuthorID int64 `json:"original_author_id"`
 	// Body contains the comment text content
 	Body string `json:"body"`
 	// Attachments contains files attached to the comment

modules/structs/repo.go

@@ -358,6 +358,7 @@ const (
 	CodebaseService                              // 8 codebase service
 	CodeCommitService                            // 9 codecommit service
 	BitbucketServerService                       // 10 bitbucket server (data center) service
+	ForgejoService                               // 11 forgejo service
 )
 
 // Name represents the service type's name
@@ -387,6 +388,8 @@ func (gt GitServiceType) Title() string {
 		return "CodeCommit"
 	case BitbucketServerService:
 		return "Bitbucket Server"
+	case ForgejoService:
+		return "Forgejo"
 	case PlainGitService:
 		return "Git"
 	}
@@ -423,7 +426,7 @@ type MigrateRepoOptions struct {
 	// required: true
 	RepoName string `json:"repo_name" binding:"Required;AlphaDashDot;MaxSize(100)"`
 
-	// enum: ["git","github","gitea","gitlab","gogs","onedev","gitbucket","codebase","codecommit","bitbucketserver"]
+	// enum: ["git","github","gitea","gitlab","gogs","onedev","gitbucket","codebase","codecommit","bitbucketserver","forgejo"]
 	Service      string `json:"service"`
 	AuthUsername string `json:"auth_username"`
 	AuthPassword string `json:"auth_password"`
@@ -449,7 +452,7 @@ type MigrateRepoOptions struct {
 // TokenAuth represents whether a service type supports token-based auth
 func (gt GitServiceType) TokenAuth() bool {
 	switch gt {
-	case GithubService, GiteaService, GitlabService:
+	case GithubService, GiteaService, GitlabService, ForgejoService:
 		return true
 	}
 	return false
@@ -461,6 +464,7 @@ var SupportedFullGitService = []GitServiceType{
 	GithubService,
 	GitlabService,
 	GiteaService,
+	ForgejoService,
 	GogsService,
 	OneDevService,
 	GitBucketService,