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

templates/repo/migrate.tmpl

@@ -14,6 +14,7 @@
 						<input id="clone_addr" name="clone_addr" value="{{.clone_addr}}" autofocus required>
 						<span class="help">
 						{{.i18n.Tr "repo.migrate.clone_address_desc"}}{{if .ContextUser.CanImportLocal}} {{.i18n.Tr "repo.migrate.clone_local_path"}}{{end}}
+						<br/>{{.i18n.Tr "repo.migrate.migrate_items_options"}}
 						{{if .LFSActive}}<br/>{{.i18n.Tr "repo.migrate.lfs_mirror_unsupported"}}{{end}}
 						</span>
 					</div>
@@ -80,10 +81,45 @@
 					<div class="inline field">
 						<label>{{.i18n.Tr "repo.migrate_type"}}</label>
 						<div class="ui checkbox">
-							<input name="mirror" type="checkbox" {{if .mirror}}checked{{end}}>
+							<input id="mirror" name="mirror" type="checkbox" {{if .mirror}}checked{{end}}>
 							<label>{{.i18n.Tr "repo.migrate_type_helper" | Safe}}</label>
 						</div>
 					</div>
+					<div id="migrate_items" class="ui field">
+						<div class="inline field">
+							<label>{{.i18n.Tr "repo.migrate_items"}}</label>
+							<div class="ui checkbox">
+								<input name="wiki" type="checkbox" {{if .wiki}}checked{{end}}>
+								<label>{{.i18n.Tr "repo.migrate_items_wiki" | Safe}}</label>
+							</div>
+							<div class="ui checkbox">
+								<input name="milestones" type="checkbox" {{if .milestones}}checked{{end}}>
+								<label>{{.i18n.Tr "repo.migrate_items_milestones" | Safe}}</label>
+							</div>
+						</div>
+						<div class="inline field">
+							<label></label>
+							<div class="ui checkbox">
+								<input name="labels" type="checkbox" {{if .labels}}checked{{end}}>
+								<label>{{.i18n.Tr "repo.migrate_items_labels" | Safe}}</label>
+							</div>
+							<div class="ui checkbox">
+								<input name="issues" type="checkbox" {{if .issues}}checked{{end}}>
+								<label>{{.i18n.Tr "repo.migrate_items_issues" | Safe}}</label>
+							</div>
+						</div>
+						<div class="inline field">
+							<label></label>
+							<div class="ui checkbox">
+								<input name="pull_requests" type="checkbox" {{if .pull_requests}}checked{{end}}>
+								<label>{{.i18n.Tr "repo.migrate_items_pullrequests" | Safe}}</label>
+							</div>
+							<div class="ui checkbox">
+								<input name="releases" type="checkbox" {{if .releases}}checked{{end}}>
+								<label>{{.i18n.Tr "repo.migrate_items_releases" | Safe}}</label>
+							</div>
+						</div>
+					</div>
 					<div class="inline field {{if .Err_Description}}error{{end}}">
 						<label for="description">{{.i18n.Tr "repo.repo_desc"}}</label>
 						<textarea id="description" name="description">{{.description}}</textarea>

templates/swagger/v1_json.tmpl

@@ -8479,6 +8479,18 @@
           "type": "string",
           "x-go-name": "Description"
         },
+        "issues": {
+          "type": "boolean",
+          "x-go-name": "Issues"
+        },
+        "labels": {
+          "type": "boolean",
+          "x-go-name": "Labels"
+        },
+        "milestones": {
+          "type": "boolean",
+          "x-go-name": "Milestones"
+        },
         "mirror": {
           "type": "boolean",
           "x-go-name": "Mirror"
@@ -8487,6 +8499,14 @@
           "type": "boolean",
           "x-go-name": "Private"
         },
+        "pull_requests": {
+          "type": "boolean",
+          "x-go-name": "PullRequests"
+        },
+        "releases": {
+          "type": "boolean",
+          "x-go-name": "Releases"
+        },
         "repo_name": {
           "type": "string",
           "x-go-name": "RepoName"
@@ -8495,6 +8515,10 @@
           "type": "integer",
           "format": "int64",
           "x-go-name": "UID"
+        },
+        "wiki": {
+          "type": "boolean",
+          "x-go-name": "Wiki"
         }
       },
       "x-go-package": "code.gitea.io/gitea/modules/auth"