diff --git a/internal/services/gateway/common/run.go b/internal/services/gateway/common/run.go
new file mode 100644
index 0000000..d2c3939
--- /dev/null
+++ b/internal/services/gateway/common/run.go
@@ -0,0 +1,58 @@
+// Copyright 2019 Sorint.lab
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package common
+
+import (
+	"fmt"
+	"net/url"
+	"path"
+
+	"github.com/pkg/errors"
+	"github.com/sorintlab/agola/internal/services/types"
+	"github.com/sorintlab/agola/internal/util"
+)
+
+type GroupType string
+
+const (
+	GroupTypeProject     GroupType = "project"
+	GroupTypeUser        GroupType = "user"
+	GroupTypeBranch      GroupType = "branch"
+	GroupTypeTag         GroupType = "tag"
+	GroupTypePullRequest GroupType = "pr"
+)
+
+func GenRunGroup(baseGroupType GroupType, baseGroupID string, webhookData *types.WebhookData) string {
+	// we pathescape the branch name to handle branches with slashes and make the
+	// branch a single path entry
+	switch webhookData.Event {
+	case types.WebhookEventPush:
+		return path.Join("/", string(baseGroupType), baseGroupID, string(GroupTypeBranch), url.PathEscape(webhookData.Branch))
+	case types.WebhookEventTag:
+		return path.Join("/", string(baseGroupType), baseGroupID, string(GroupTypeTag), url.PathEscape(webhookData.Tag))
+	case types.WebhookEventPullRequest:
+		return path.Join("/", string(baseGroupType), baseGroupID, string(GroupTypePullRequest), url.PathEscape(webhookData.PullRequestID))
+	}
+
+	panic(fmt.Errorf("invalid webhook event type: %q", webhookData.Event))
+}
+
+func ProjectIDFromRunGroup(group string) (string, error) {
+	pl := util.PathList(group)
+	if len(pl) < 2 {
+		return "", errors.Errorf("cannot determine group project id, wrong group path %q", group)
+	}
+	return pl[1], nil
+}
diff --git a/internal/services/gateway/webhook.go b/internal/services/gateway/webhook.go
index b86d4ba..226433f 100644
--- a/internal/services/gateway/webhook.go
+++ b/internal/services/gateway/webhook.go
@@ -18,7 +18,6 @@ import (
 	"context"
 	"fmt"
 	"net/http"
-	"net/url"
 	"path"
 
 	"github.com/sorintlab/agola/internal/config"
@@ -68,16 +67,6 @@ const (
 	AnnotationPullRequestLink = "pull_request_link"
 )
 
-type GroupType string
-
-const (
-	GroupTypeProject     GroupType = "project"
-	GroupTypeUser        GroupType = "user"
-	GroupTypeBranch      GroupType = "branch"
-	GroupTypeTag         GroupType = "tag"
-	GroupTypePullRequest GroupType = "pr"
-)
-
 func genAnnotationVirtualBranch(webhookData *types.WebhookData) string {
 	switch webhookData.Event {
 	case types.WebhookEventPush:
@@ -91,21 +80,6 @@ func genAnnotationVirtualBranch(webhookData *types.WebhookData) string {
 	panic(fmt.Errorf("invalid webhook event type: %q", webhookData.Event))
 }
 
-func genGroup(baseGroupType GroupType, baseGroupID string, webhookData *types.WebhookData) string {
-	// we pathescape the branch name to handle branches with slashes and make the
-	// branch a single path entry
-	switch webhookData.Event {
-	case types.WebhookEventPush:
-		return path.Join("/", string(baseGroupType), baseGroupID, string(GroupTypeBranch), url.PathEscape(webhookData.Branch))
-	case types.WebhookEventTag:
-		return path.Join("/", string(baseGroupType), baseGroupID, string(GroupTypeTag), url.PathEscape(webhookData.Tag))
-	case types.WebhookEventPullRequest:
-		return path.Join("/", string(baseGroupType), baseGroupID, string(GroupTypePullRequest), url.PathEscape(webhookData.PullRequestID))
-	}
-
-	panic(fmt.Errorf("invalid webhook event type: %q", webhookData.Event))
-}
-
 type webhooksHandler struct {
 	log               *zap.SugaredLogger
 	ah                *action.ActionHandler
@@ -321,9 +295,9 @@ func (h *webhooksHandler) handleWebhook(r *http.Request) (int, string, error) {
 
 	var group string
 	if !isUserBuild {
-		group = genGroup(GroupTypeProject, webhookData.ProjectID, webhookData)
+		group = common.GenRunGroup(common.GroupTypeProject, webhookData.ProjectID, webhookData)
 	} else {
-		group = genGroup(GroupTypeUser, userID, webhookData)
+		group = common.GenRunGroup(common.GroupTypeUser, userID, webhookData)
 	}
 
 	if err := h.createRuns(ctx, filename, data, group, annotations, env, variables, webhookData); err != nil {