Add support for migrating from Gitlab (#9084)

* First stab at a Gitlab migrations interface.

* Modify JS to show migration for Gitlab

* Properly strip out #gitlab tag from repo name

* Working Gitlab migrations!
Still need to figure out how to hide tokens/etc from showing up in opts.CloneAddr

* Try #2 at trying to hide credentials.
CloneAddr was being used as OriginalURL.
Now passing OriginalURL through from the form and saving it.

* Add go-gitlab dependency

* Vendor go-gitlab

* Use gitlab.BasicAuthClient
Correct CloneURL.
This should be functioning!
Previous commits fixed "Migrated from"
from including the migration credentials.

* Replaced repoPath with repoID globally.
RepoID is grabbed in NewGitlabDownloader

* Logging touchup

* Properly set private repo status.
Properly set milestone deadline time.
Consistently use Gitlab username for 'Name'.

* Add go-gitlab vendor cache

* Fix PR migrations:
- Count of issues is kept to set a non-conflicting PR.ID
- Bool is used to tell whether to fetch Issue or PR comments

* Ensure merged PRs are closed and set with the proper time

* Remove copyright and some commented code

* Rip out '#gitlab' based self-hosted Gitlab support

* Hide given credentials for migrated repos.

CloneAddr was being saved as OriginalURL.

Now passing OriginalURL through from the form and
saving it in it's place

* Use asset.URL directly, no point in parsing.
Opened PRs should fall through to false.

* Fix importing Milestones.
Allow importing using Personal Tokens or anonymous access.

* Fix Gitlab Milestone migration if DueDate isn't set

* Empty Milestone due dates properly return nil, not zero time

* Add GITLAB_READ_TOKEN to drone unit-test step

* Add working gitlab_test.go.
A Personal Access Token, given in env variable GITLAB_READ_TOKEN
is required to run the test.

* Fix linting issues

* Add modified JS files

* Remove pre-build JS files

* Only merged PRs are marged as merged/closed

* Test topics

* Skip test if gitlab is inaccessible

* Grab personal token from username, not password.
Matches Github migration implementation

* Add SetContext() to GitlabDownloader.

* Checking Updated field in Issues.

* Actually fetch Issue Updated time from Gitlab

* Add Gitlab migration GetReviews() stub

* Fix Patch and Clone URLs

* check Updated too

* fix mod

* make vendor with go1.14

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

vendor/github.com/xanzy/go-gitlab/feature_flags.go

@@ -0,0 +1,79 @@
+package gitlab
+
+import (
+	"fmt"
+	"net/url"
+)
+
+// FeaturesService handles the communication with the application FeaturesService
+// related methods of the GitLab API.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/features.html
+type FeaturesService struct {
+	client *Client
+}
+
+// Feature represents a GitLab feature flag.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/features.html
+type Feature struct {
+	Name  string `json:"name"`
+	State string `json:"state"`
+	Gates []Gate
+}
+
+// Gate represents a gate of a GitLab feature flag.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/features.html
+type Gate struct {
+	Key   string      `json:"key"`
+	Value interface{} `json:"value"`
+}
+
+func (f Feature) String() string {
+	return Stringify(f)
+}
+
+// ListFeatures gets a list of feature flags
+//
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/features.html#list-all-features
+func (s *FeaturesService) ListFeatures(options ...OptionFunc) ([]*Feature, *Response, error) {
+	req, err := s.client.NewRequest("GET", "features", nil, options)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var f []*Feature
+	resp, err := s.client.Do(req, &f)
+	if err != nil {
+		return nil, resp, err
+	}
+	return f, resp, err
+}
+
+// SetFeatureFlag sets or creates a feature flag gate
+//
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/features.html#set-or-create-a-feature
+func (s *FeaturesService) SetFeatureFlag(name string, value interface{}, options ...OptionFunc) (*Feature, *Response, error) {
+	u := fmt.Sprintf("features/%s", url.PathEscape(name))
+
+	opt := struct {
+		Value interface{} `url:"value" json:"value"`
+	}{
+		value,
+	}
+
+	req, err := s.client.NewRequest("POST", u, opt, options)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	f := &Feature{}
+	resp, err := s.client.Do(req, f)
+	if err != nil {
+		return nil, resp, err
+	}
+	return f, resp, err
+}