Support using label names when changing issue labels (#30943)

Resolve #30917

Make the APIs for adding labels and replacing labels support both label
IDs and label names so the
[`actions/labeler`](https://github.com/actions/labeler) action can work
in Gitea.

<img width="600px"
src="https://github.com/go-gitea/gitea/assets/15528715/7835c771-f637-4c57-9ce5-e4fbf56fa0d3"
/>

1 files changed, 51 insertions, 2 deletions

diff --git a/tests/integration/api_issue_label_test.go b/tests/integration/api_issue_label_test.go
index 35c0718263..0e4cd8243b 100644
--- a/tests/integration/api_issue_label_test.go
+++ b/tests/integration/api_issue_label_test.go
@@ -104,7 +104,7 @@ func TestAPIAddIssueLabels(t *testing.T) {
 	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/labels",
 		repo.OwnerName, repo.Name, issue.Index)
 	req := NewRequestWithJSON(t, "POST", urlStr, &api.IssueLabelsOption{
-		Labels: []int64{1, 2},
+		Labels: []any{1, 2},
 	}).AddTokenAuth(token)
 	resp := MakeRequest(t, req, http.StatusOK)
 	var apiLabels []*api.Label
@@ -114,6 +114,32 @@ func TestAPIAddIssueLabels(t *testing.T) {
 	unittest.AssertExistsAndLoadBean(t, &issues_model.IssueLabel{IssueID: issue.ID, LabelID: 2})
 }
 
+func TestAPIAddIssueLabelsWithLabelNames(t *testing.T) {
+	assert.NoError(t, unittest.LoadFixtures())
+
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{RepoID: repo.ID})
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
+
+	session := loginUser(t, owner.Name)
+	token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteIssue)
+	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/labels",
+		repo.OwnerName, repo.Name, issue.Index)
+	req := NewRequestWithJSON(t, "POST", urlStr, &api.IssueLabelsOption{
+		Labels: []any{"label1", "label2"},
+	}).AddTokenAuth(token)
+	resp := MakeRequest(t, req, http.StatusOK)
+	var apiLabels []*api.Label
+	DecodeJSON(t, resp, &apiLabels)
+	assert.Len(t, apiLabels, unittest.GetCount(t, &issues_model.IssueLabel{IssueID: issue.ID}))
+
+	var apiLabelNames []string
+	for _, label := range apiLabels {
+		apiLabelNames = append(apiLabelNames, label.Name)
+	}
+	assert.ElementsMatch(t, apiLabelNames, []string{"label1", "label2"})
+}
+
 func TestAPIReplaceIssueLabels(t *testing.T) {
 	assert.NoError(t, unittest.LoadFixtures())
 
@@ -127,7 +153,7 @@ func TestAPIReplaceIssueLabels(t *testing.T) {
 	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/labels",
 		owner.Name, repo.Name, issue.Index)
 	req := NewRequestWithJSON(t, "PUT", urlStr, &api.IssueLabelsOption{
-		Labels: []int64{label.ID},
+		Labels: []any{label.ID},
 	}).AddTokenAuth(token)
 	resp := MakeRequest(t, req, http.StatusOK)
 	var apiLabels []*api.Label
@@ -140,6 +166,29 @@ func TestAPIReplaceIssueLabels(t *testing.T) {
 	unittest.AssertExistsAndLoadBean(t, &issues_model.IssueLabel{IssueID: issue.ID, LabelID: label.ID})
 }
 
+func TestAPIReplaceIssueLabelsWithLabelNames(t *testing.T) {
+	assert.NoError(t, unittest.LoadFixtures())
+
+	repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1})
+	issue := unittest.AssertExistsAndLoadBean(t, &issues_model.Issue{RepoID: repo.ID})
+	label := unittest.AssertExistsAndLoadBean(t, &issues_model.Label{RepoID: repo.ID})
+	owner := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: repo.OwnerID})
+
+	session := loginUser(t, owner.Name)
+	token := getTokenForLoggedInUser(t, session, auth_model.AccessTokenScopeWriteIssue)
+	urlStr := fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/labels",
+		owner.Name, repo.Name, issue.Index)
+	req := NewRequestWithJSON(t, "PUT", urlStr, &api.IssueLabelsOption{
+		Labels: []any{label.Name},
+	}).AddTokenAuth(token)
+	resp := MakeRequest(t, req, http.StatusOK)
+	var apiLabels []*api.Label
+	DecodeJSON(t, resp, &apiLabels)
+	if assert.Len(t, apiLabels, 1) {
+		assert.EqualValues(t, label.Name, apiLabels[0].Name)
+	}
+}
+
 func TestAPIModifyOrgLabels(t *testing.T) {
 	assert.NoError(t, unittest.LoadFixtures())