fix: Resolve '400 Custom domains' error on GitHub Enterprise Server (#3489)

Author: atilsensalduz

github/github-accessors.go

@@ -170,7 +170,36 @@ func (s *RepositoriesService) UpdatePages(ctx context.Context, owner, repo strin
 	if err != nil {
 		return resp, err
 	}
+	return resp, nil
+}
+
+// PagesUpdateWithoutCNAME defines parameters for updating a GitHub Pages site on GitHub Enterprise Servers.
+// Sending a request with a CNAME (any value, empty string, or null) results in a 400 error: "Custom domains are not available for GitHub Pages".
+type PagesUpdateWithoutCNAME struct {
+	BuildType     *string      `json:"build_type,omitempty"`
+	Source        *PagesSource `json:"source,omitempty"`
+	Public        *bool        `json:"public,omitempty"`
+	HTTPSEnforced *bool        `json:"https_enforced,omitempty"`
+}
+
+// UpdatePagesGHES updates GitHub Pages for the named repo in GitHub Enterprise Servers.
+//
+// GitHub API docs: https://docs.github.com/rest/pages/pages#update-information-about-a-github-pages-site
+//
+//meta:operation PUT /repos/{owner}/{repo}/pages
+func (s *RepositoriesService) UpdatePagesGHES(ctx context.Context, owner, repo string, opts *PagesUpdateWithoutCNAME) (*Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/pages", owner, repo)
 
+	req, err := s.client.NewRequest("PUT", u, opts)
+
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := s.client.Do(ctx, req, nil)
+	if err != nil {
+		return resp, err
+	}
 	return resp, nil
 }
 

github/github-accessors_test.go

@@ -200,6 +200,44 @@ func TestRepositoriesService_UpdatePagesWorkflow(t *testing.T) {
 	})
 }
 
+func TestRepositoriesService_UpdatePagesGHES(t *testing.T) {
+	t.Parallel()
+	client, mux, _ := setup(t)
+
+	input := &PagesUpdateWithoutCNAME{
+		BuildType: Ptr("workflow"),
+	}
+
+	mux.HandleFunc("/repos/o/r/pages", func(w http.ResponseWriter, r *http.Request) {
+		v := new(PagesUpdate)
+		assertNilError(t, json.NewDecoder(r.Body).Decode(v))
+
+		testMethod(t, r, "PUT")
+		want := &PagesUpdate{BuildType: Ptr("workflow")}
+		if !cmp.Equal(v, want) {
+			t.Errorf("Request body = %+v, want %+v", v, want)
+		}
+
+		fmt.Fprint(w, `{"build_type":"workflow"}`)
+	})
+
+	ctx := context.Background()
+	_, err := client.Repositories.UpdatePagesGHES(ctx, "o", "r", input)
+	if err != nil {
+		t.Errorf("Repositories.UpdatePagesGHES returned error: %v", err)
+	}
+
+	const methodName = "UpdatePagesGHES"
+	testBadOptions(t, methodName, func() (err error) {
+		_, err = client.Repositories.UpdatePagesGHES(ctx, "\n", "\n", input)
+		return err
+	})
+
+	testNewRequestAndDoFailure(t, methodName, client, func() (*Response, error) {
+		return client.Repositories.UpdatePagesGHES(ctx, "o", "r", input)
+	})
+}
+
 func TestRepositoriesService_UpdatePages_NullCNAME(t *testing.T) {
 	t.Parallel()
 	client, mux, _ := setup(t)