feat(app/sources): source create view (#2680)

Co-authored-by: Chaim Lev-Ari <chaim.lev-ari@portainer.io>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

api/http/handler/gitops/sources/source_connection.go

@@ -14,10 +14,10 @@ import (
 	"github.com/portainer/portainer/pkg/libhttp/response"
 )
 
-// @id GitOpsSourcesTestGit
-// @summary Test a Git source connection
+// @id GitOpsSourcesTestById
+// @summary Test the connection of a stored source
 // @description Tests connectivity for a GitOps source, applying optional overrides to the stored configuration.
-// @description **Access policy**: admin
+// @description **Access policy**: administrator
 // @tags gitops
 // @security ApiKeyAuth
 // @security jwt
@@ -72,6 +72,40 @@ type ConnectionTestResult struct {
 	Error   string `json:"error,omitempty"`
 }
 
+// @id GitOpsSourcesTest
+// @summary Test a Git source connection
+// @description Tests connectivity for Git connection details that have not been persisted yet.
+// @description **Access policy**: administrator
+// @tags gitops
+// @security ApiKeyAuth
+// @security jwt
+// @accept json
+// @produce json
+// @param body body GitSourceCreatePayload true "Git connection details"
+// @success 200 {object} ConnectionTestResult "Connection test result"
+// @failure 400 "Invalid request payload"
+// @failure 403 "Access denied"
+// @failure 500 "Server error"
+// @router /gitops/sources/test [post]
+func (h *Handler) gitSourceTest(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
+	var payload GitSourceCreatePayload
+	if err := request.DecodeAndValidateJSONPayload(r, &payload); err != nil {
+		return httperror.BadRequest("Invalid request payload", err)
+	}
+
+	src, err := BuildGitSource(payload)
+	if err != nil {
+		return httperror.BadRequest("Invalid request payload", err)
+	}
+	if src.Git == nil {
+		return httperror.InternalServerError("Source has no git configuration", nil)
+	}
+
+	result := testSourceConnection(r.Context(), h.gitService, src.Git)
+
+	return response.JSON(w, result)
+}
+
 // testSourceConnection verifies that a git repository is reachable with the given config.
 func testSourceConnection(ctx context.Context, gitService portainer.GitService, config *gittypes.RepoConfig) ConnectionTestResult {
 	var username, password string