add gitlab provider support

README.md

@@ -75,6 +75,39 @@ DRONE_CONVERT_PLUGIN_ENDPOINT=http://1.2.3.4:3000
 DRONE_CONVERT_PLUGIN_SECRET=bea26a2221fd8090ea38720fc445eca6
 ```
 
+
+## Gitlab Server
+
+1. Create a github token via https://your-github-server-address/profile/personal_access_tokens with the scope of `repo`
+
+2. Create a shares secret:
+
+```console
+$ openssl rand -hex 16
+f9b759a35620876fb46f42dffdc7d25b
+```
+
+3. Download ran run the plugin:
+
+```console
+$ docker run -d \
+  --publish=3000:3000 \
+  --env=DRONE_DEBUG=true \
+  --env=DRONE_SECRET=f9b759a35620876fb46f42dffdc7d25b \
+  --env=TOKEN=9e6eij3ckzvpe9mrhnqcis6zf8dhopmm46e3pi96 \
+  --env=PROVIDER=gitlab \
+  --env=GITLAB_SERVER=https://your-gitlab-server-address
+  --restart=always \
+  --name=converter meltwater/drone-convert-pathschanged
+```
+
+4. Update your Drone server configuration to include the plugin address and the shared secret.
+
+```text
+DRONE_CONVERT_PLUGIN_ENDPOINT=http://1.2.3.4:3000
+DRONE_CONVERT_PLUGIN_SECRET=f9b759a35620876fb46f42dffdc7d25b
+```
+
 ## Bitbucket Cloud
 
 1.  Create an "App password" via https://bitbucket.org/account/settings/app-passwords and select only "Read" under "Repositories"

main.go

@@ -35,6 +35,7 @@ type (
 		BitBucketUser     string `envconfig:"BITBUCKET_USER"`
 		BitBucketPassword string `envconfig:"BITBUCKET_PASSWORD"`
 		GithubServer      string `envconfig:"GITHUB_SERVER"`
+		GitlabServer      string `envconfig:"GITLAB_SERVER"`
 		StashServer       string `envconfig:"STASH_SERVER"`
 	}
 )
@@ -60,14 +61,15 @@ func validate(spec *spec) error {
 			// bitbucket-server support is deprecated in favor of stash, it will be removed in a future version
 			"bitbucket-server",
 			"github",
+			"gitlab",
 			"stash",
 			"gitee",
 		}
 		if !contains(providers, spec.Provider) {
 			return fmt.Errorf("unsupported provider")
 		}
 	}
-	if spec.Token == "" && (spec.Provider == "github" || spec.Provider == "bitbucket-server" || spec.Provider == "stash") {
+	if spec.Token == "" && (spec.Provider == "github" || spec.Provider == "gitlab" || spec.Provider == "bitbucket-server" || spec.Provider == "stash") {
 		return fmt.Errorf("missing token")
 	}
 	if spec.BitBucketUser == "" && spec.Provider == "bitbucket" {
@@ -130,6 +132,7 @@ func main() {
 		BitBucketUser:     spec.BitBucketUser,
 		BitBucketPassword: spec.BitBucketPassword,
 		GithubServer:      spec.GithubServer,
+		GitlabServer:      spec.GitlabServer,
 		Token:             spec.Token,
 		StashServer:       spec.StashServer,
 	}

plugin/plugin.go

@@ -25,6 +25,7 @@ type (
 		BitBucketUser     string
 		BitBucketPassword string
 		GithubServer      string
+		GitlabServer      string
 		StashServer       string
 		Token             string
 	}
@@ -160,6 +161,11 @@ func (p *plugin) Convert(ctx context.Context, req *converter.Request) (*drone.Co
 			if err != nil {
 				return nil, err
 			}
+		case "gitlab":
+			changedFiles, err = providers.GetGitLabFilesChanged(req.Repo, req.Build, p.params.Token, p.params.GitlabServer)
+			if err != nil {
+				return nil, err
+			}
 		case "bitbucket":
 			changedFiles, err = providers.GetBitbucketFilesChanged(req.Repo, req.Build, p.params.BitBucketUser, p.params.BitBucketPassword, scm.ListOptions{})
 			if err != nil {

providers/gitlab.go

@@ -0,0 +1,64 @@
+package providers
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/drone/drone-go/drone"
+	"github.com/drone/go-scm/scm"
+	"github.com/drone/go-scm/scm/driver/gitlab"
+	"github.com/drone/go-scm/scm/transport"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func GetGitLabFilesChanged(repo drone.Repo, build drone.Build, token string, uri string) ([]string, error) {
+	var err error
+
+	newctx := context.Background()
+	client, err := gitlab.New(uri)
+	if err != nil {
+		return nil, err
+	}
+	client.Client = &http.Client{
+		Transport: &transport.PrivateToken{
+			Token: token,
+		},
+	}
+
+	var changes []*scm.Change
+	var result *scm.Response
+
+	if build.Before == "" || build.Before == scm.EmptyCommit {
+		changes, result, err = client.Git.ListChanges(newctx, repo.Slug, build.After, scm.ListOptions{})
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		changes, result, err = client.Git.CompareChanges(newctx, repo.Slug, build.Before, build.After, scm.ListOptions{})
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	GitLabApiCount.Set(float64(result.Rate.Remaining))
+
+	var files []string
+	for _, c := range changes {
+		files = append(files, c.Path)
+	}
+
+	return files, nil
+}
+
+var (
+	GitLabApiCount = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Name: "gitlab_api_calls_remaining",
+			Help: "Total number of github api calls per hour remaining",
+		})
+)
+
+func init() {
+	prometheus.MustRegister(GitLabApiCount)
+}