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/license_templates.go

@@ -0,0 +1,92 @@
+package gitlab
+
+import (
+	"fmt"
+)
+
+// LicenseTemplate represents a license template.
+//
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/templates/licenses.html
+type LicenseTemplate struct {
+	Key         string   `json:"key"`
+	Name        string   `json:"name"`
+	Nickname    string   `json:"nickname"`
+	Featured    bool     `json:"featured"`
+	HTMLURL     string   `json:"html_url"`
+	SourceURL   string   `json:"source_url"`
+	Description string   `json:"description"`
+	Conditions  []string `json:"conditions"`
+	Permissions []string `json:"permissions"`
+	Limitations []string `json:"limitations"`
+	Content     string   `json:"content"`
+}
+
+// LicenseTemplatesService handles communication with the license templates
+// related methods of the GitLab API.
+//
+// GitLab API docs: https://docs.gitlab.com/ce/api/templates/licenses.html
+type LicenseTemplatesService struct {
+	client *Client
+}
+
+// ListLicenseTemplatesOptions represents the available
+// ListLicenseTemplates() options.
+//
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/templates/licenses.html#list-license-templates
+type ListLicenseTemplatesOptions struct {
+	ListOptions
+	Popular *bool `url:"popular,omitempty" json:"popular,omitempty"`
+}
+
+// ListLicenseTemplates get all license templates.
+//
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/templates/licenses.html#list-license-templates
+func (s *LicenseTemplatesService) ListLicenseTemplates(opt *ListLicenseTemplatesOptions, options ...OptionFunc) ([]*LicenseTemplate, *Response, error) {
+	req, err := s.client.NewRequest("GET", "templates/licenses", opt, options)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var lts []*LicenseTemplate
+	resp, err := s.client.Do(req, &lts)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return lts, resp, err
+}
+
+// GetLicenseTemplateOptions represents the available
+// GetLicenseTemplate() options.
+//
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/templates/licenses.html#single-license-template
+type GetLicenseTemplateOptions struct {
+	Project  *string `url:"project,omitempty" json:"project,omitempty"`
+	Fullname *string `url:"fullname,omitempty" json:"fullname,omitempty"`
+}
+
+// GetLicenseTemplate get a single license template. You can pass parameters
+// to replace the license placeholder.
+//
+// GitLab API docs:
+// https://docs.gitlab.com/ce/api/templates/licenses.html#single-license-template
+func (s *LicenseTemplatesService) GetLicenseTemplate(template string, opt *GetLicenseTemplateOptions, options ...OptionFunc) (*LicenseTemplate, *Response, error) {
+	u := fmt.Sprintf("templates/licenses/%s", template)
+
+	req, err := s.client.NewRequest("GET", u, opt, options)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	lt := new(LicenseTemplate)
+	resp, err := s.client.Do(req, lt)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return lt, resp, err
+}