Git migration UX (#12619)

* Initial work

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Implementation

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Fix gitlab and token cloning

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Imports and JS

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Fix test

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Linting

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Generate swagger

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Move mirror toggle and rename options

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

modules/migrations/base/downloader.go

@@ -7,13 +7,20 @@ package base
 
 import (
 	"context"
+	"io"
 	"time"
 
 	"code.gitea.io/gitea/modules/structs"
 )
 
+// AssetDownloader downloads an asset (attachment) for a release
+type AssetDownloader interface {
+	GetAsset(tag string, id int64) (io.ReadCloser, error)
+}
+
 // Downloader downloads the site repo informations
 type Downloader interface {
+	AssetDownloader
 	SetContext(context.Context)
 	GetRepoInfo() (*Repository, error)
 	GetTopics() ([]string, error)
@@ -28,7 +35,6 @@ type Downloader interface {
 
 // DownloaderFactory defines an interface to match a downloader implementation and create a downloader
 type DownloaderFactory interface {
-	Match(opts MigrateOptions) (bool, error)
 	New(opts MigrateOptions) (Downloader, error)
 	GitServiceType() structs.GitServiceType
 }

modules/migrations/base/release.go

@@ -8,7 +8,7 @@ import "time"
 
 // ReleaseAsset represents a release asset
 type ReleaseAsset struct {
-	URL           string
+	ID            int64
 	Name          string
 	ContentType   *string
 	Size          *int

modules/migrations/base/uploader.go

@@ -11,7 +11,7 @@ type Uploader interface {
 	CreateRepo(repo *Repository, opts MigrateOptions) error
 	CreateTopics(topic ...string) error
 	CreateMilestones(milestones ...*Milestone) error
-	CreateReleases(releases ...*Release) error
+	CreateReleases(downloader Downloader, releases ...*Release) error
 	SyncTags() error
 	CreateLabels(labels ...*Label) error
 	CreateIssues(issues ...*Issue) error