Send/receive error details with widgets (#4492)

* Send/receive error details with widgets

* Fix embedded client tests

* Use all properties of error responses

* Lint

* Rewrite ternary expression as if statement

* Put typehints on overridden functions

* Lint

* Update matrix-widget-api

* Don't @link across packages

as gendoc fails when doing so.

* Add a missing docstring

* Set widget response error string to correct value

* Test conversion to/from widget error payloads

* Test processing errors thrown by widget transport

* Lint

* Test processing errors from transport.sendComplete

package.json

@@ -58,7 +58,7 @@
         "jwt-decode": "^4.0.0",
         "loglevel": "^1.7.1",
         "matrix-events-sdk": "0.0.1",
-        "matrix-widget-api": "^1.8.2",
+        "matrix-widget-api": "^1.10.0",
         "oidc-client-ts": "^3.0.1",
         "p-retry": "4",
         "sdp-transform": "^2.14.1",

spec/unit/embedded.spec.ts

@@ -30,9 +30,10 @@ import {
     ITurnServer,
     IRoomEvent,
     IOpenIDCredentials,
+    WidgetApiResponseError,
 } from "matrix-widget-api";
 
-import { createRoomWidgetClient, MsgType, UpdateDelayedEventAction } from "../../src/matrix";
+import { createRoomWidgetClient, MatrixError, MsgType, UpdateDelayedEventAction } from "../../src/matrix";
 import { MatrixClient, ClientEvent, ITurnServer as IClientTurnServer } from "../../src/client";
 import { SyncState } from "../../src/sync";
 import { ICapabilities, RoomWidgetClient } from "../../src/embedded";
@@ -90,7 +91,11 @@ class MockWidgetApi extends EventEmitter {
     public getTurnServers = jest.fn(() => []);
     public sendContentLoaded = jest.fn();
 
-    public transport = { reply: jest.fn() };
+    public transport = {
+        reply: jest.fn(),
+        send: jest.fn(),
+        sendComplete: jest.fn(),
+    };
 }
 
 declare module "../../src/types" {
@@ -187,6 +192,46 @@ describe("RoomWidgetClient", () => {
                     .map((e) => e.getEffectiveEvent()),
             ).toEqual([event]);
         });
+
+        it("handles widget errors with generic error data", async () => {
+            const error = new Error("failed to send");
+            widgetApi.transport.send.mockRejectedValue(error);
+
+            await makeClient({ sendEvent: ["org.matrix.rageshake_request"] });
+            widgetApi.sendRoomEvent.mockImplementation(widgetApi.transport.send);
+
+            await expect(
+                client.sendEvent("!1:example.org", "org.matrix.rageshake_request", { request_id: 123 }),
+            ).rejects.toThrow(error);
+        });
+
+        it("handles widget errors with Matrix API error response data", async () => {
+            const errorStatusCode = 400;
+            const errorUrl = "http://example.org";
+            const errorData = {
+                errcode: "M_BAD_JSON",
+                error: "Invalid body",
+            };
+
+            const widgetError = new WidgetApiResponseError("failed to send", {
+                matrix_api_error: {
+                    http_status: errorStatusCode,
+                    http_headers: {},
+                    url: errorUrl,
+                    response: errorData,
+                },
+            });
+            const matrixError = new MatrixError(errorData, errorStatusCode, errorUrl);
+
+            widgetApi.transport.send.mockRejectedValue(widgetError);
+
+            await makeClient({ sendEvent: ["org.matrix.rageshake_request"] });
+            widgetApi.sendRoomEvent.mockImplementation(widgetApi.transport.send);
+
+            await expect(
+                client.sendEvent("!1:example.org", "org.matrix.rageshake_request", { request_id: 123 }),
+            ).rejects.toThrow(matrixError);
+        });
     });
 
     describe("delayed events", () => {
@@ -598,6 +643,42 @@ describe("RoomWidgetClient", () => {
             await makeClient({});
             expect(await client.getOpenIdToken()).toStrictEqual(testOIDCToken);
         });
+
+        it("handles widget errors with generic error data", async () => {
+            const error = new Error("failed to get token");
+            widgetApi.transport.sendComplete.mockRejectedValue(error);
+
+            await makeClient({});
+            widgetApi.requestOpenIDConnectToken.mockImplementation(widgetApi.transport.sendComplete as any);
+
+            await expect(client.getOpenIdToken()).rejects.toThrow(error);
+        });
+
+        it("handles widget errors with Matrix API error response data", async () => {
+            const errorStatusCode = 400;
+            const errorUrl = "http://example.org";
+            const errorData = {
+                errcode: "M_UNKNOWN",
+                error: "Bad request",
+            };
+
+            const widgetError = new WidgetApiResponseError("failed to get token", {
+                matrix_api_error: {
+                    http_status: errorStatusCode,
+                    http_headers: {},
+                    url: errorUrl,
+                    response: errorData,
+                },
+            });
+            const matrixError = new MatrixError(errorData, errorStatusCode, errorUrl);
+
+            widgetApi.transport.sendComplete.mockRejectedValue(widgetError);
+
+            await makeClient({});
+            widgetApi.requestOpenIDConnectToken.mockImplementation(widgetApi.transport.sendComplete as any);
+
+            await expect(client.getOpenIdToken()).rejects.toThrow(matrixError);
+        });
     });
 
     it("gets TURN servers", async () => {

spec/unit/http-api/errors.spec.ts

@@ -25,8 +25,8 @@ describe("MatrixError", () => {
         headers = new Headers({ "Content-Type": "application/json" });
     });
 
-    function makeMatrixError(httpStatus: number, data: IErrorJson): MatrixError {
+    function makeMatrixError(httpStatus: number, data: IErrorJson, url?: string): MatrixError {
-        return new MatrixError(data, httpStatus, undefined, undefined, headers);
+        return new MatrixError(data, httpStatus, url, undefined, headers);
     }
 
     it("should accept absent retry time from rate-limit error", () => {
@@ -95,4 +95,95 @@ describe("MatrixError", () => {
         const err = makeMatrixError(429, { errcode: "M_LIMIT_EXCEEDED" });
         expect(() => err.getRetryAfterMs()).toThrow("integer value is too large");
     });
+
+    describe("can be converted to data compatible with the widget api", () => {
+        it("from default values", () => {
+            const matrixError = new MatrixError();
+
+            const widgetApiErrorData = {
+                http_status: 400,
+                http_headers: {},
+                url: "",
+                response: {
+                    errcode: "M_UNKNOWN",
+                    error: "Unknown message",
+                },
+            };
+
+            expect(matrixError.asWidgetApiErrorData()).toEqual(widgetApiErrorData);
+        });
+
+        it("from non-default values", () => {
+            headers.set("Retry-After", "120");
+            const statusCode = 429;
+            const data = {
+                errcode: "M_LIMIT_EXCEEDED",
+                error: "Request is rate-limited.",
+                retry_after_ms: 120000,
+            };
+            const url = "http://example.net";
+
+            const matrixError = makeMatrixError(statusCode, data, url);
+
+            const widgetApiErrorData = {
+                http_status: statusCode,
+                http_headers: {
+                    "content-type": "application/json",
+                    "retry-after": "120",
+                },
+                url,
+                response: data,
+            };
+
+            expect(matrixError.asWidgetApiErrorData()).toEqual(widgetApiErrorData);
+        });
+    });
+
+    describe("can be created from data received from the widget api", () => {
+        it("from minimal data", () => {
+            const statusCode = 400;
+            const data = {
+                errcode: "M_UNKNOWN",
+                error: "Something went wrong.",
+            };
+            const url = "";
+
+            const widgetApiErrorData = {
+                http_status: statusCode,
+                http_headers: {},
+                url,
+                response: data,
+            };
+
+            headers.delete("Content-Type");
+            const matrixError = makeMatrixError(statusCode, data, url);
+
+            expect(MatrixError.fromWidgetApiErrorData(widgetApiErrorData)).toEqual(matrixError);
+        });
+
+        it("from more data", () => {
+            const statusCode = 429;
+            const data = {
+                errcode: "M_LIMIT_EXCEEDED",
+                error: "Request is rate-limited.",
+                retry_after_ms: 120000,
+            };
+            const url = "http://example.net";
+
+            const widgetApiErrorData = {
+                http_status: statusCode,
+                http_headers: {
+                    "content-type": "application/json",
+                    "retry-after": "120",
+                },
+                url,
+                response: data,
+            };
+
+            headers.set("Retry-After", "120");
+            const matrixError = makeMatrixError(statusCode, data, url);
+
+            expect(MatrixError.fromWidgetApiErrorData(widgetApiErrorData)).toEqual(matrixError);
+        });
+    });
 });

src/embedded.ts

@@ -17,12 +17,17 @@ limitations under the License.
 import {
     WidgetApi,
     WidgetApiToWidgetAction,
+    WidgetApiResponseError,
     MatrixCapabilities,
     IWidgetApiRequest,
     IWidgetApiAcknowledgeResponseData,
     ISendEventToWidgetActionRequest,
     ISendToDeviceToWidgetActionRequest,
     ISendEventFromWidgetResponseData,
+    IWidgetApiRequestData,
+    WidgetApiAction,
+    IWidgetApiResponse,
+    IWidgetApiResponseData,
 } from "matrix-widget-api";
 
 import { MatrixEvent, IEvent, IContent, EventStatus } from "./models/event.ts";
@@ -45,6 +50,7 @@ import {
 } from "./client.ts";
 import { SyncApi, SyncState } from "./sync.ts";
 import { SlidingSyncSdk } from "./sliding-sync-sdk.ts";
+import { MatrixError } from "./http-api/errors.ts";
 import { User } from "./models/user.ts";
 import { Room } from "./models/room.ts";
 import { ToDeviceBatch, ToDevicePayload } from "./models/ToDeviceMessage.ts";
@@ -147,6 +153,33 @@ export class RoomWidgetClient extends MatrixClient {
     ) {
         super(opts);
 
+        const transportSend = this.widgetApi.transport.send.bind(this.widgetApi.transport);
+        this.widgetApi.transport.send = async <
+            T extends IWidgetApiRequestData,
+            R extends IWidgetApiResponseData = IWidgetApiAcknowledgeResponseData,
+        >(
+            action: WidgetApiAction,
+            data: T,
+        ): Promise<R> => {
+            try {
+                return await transportSend<T, R>(action, data);
+            } catch (error) {
+                processAndThrow(error);
+            }
+        };
+
+        const transportSendComplete = this.widgetApi.transport.sendComplete.bind(this.widgetApi.transport);
+        this.widgetApi.transport.sendComplete = async <T extends IWidgetApiRequestData, R extends IWidgetApiResponse>(
+            action: WidgetApiAction,
+            data: T,
+        ): Promise<R> => {
+            try {
+                return await transportSendComplete<T, R>(action, data);
+            } catch (error) {
+                processAndThrow(error);
+            }
+        };
+
         this.widgetApiReady = new Promise<void>((resolve) => this.widgetApi.once("ready", resolve));
 
         // Request capabilities for the functionality this client needs to support
@@ -523,3 +556,11 @@ export class RoomWidgetClient extends MatrixClient {
         }
     }
 }
+
+function processAndThrow(error: unknown): never {
+    if (error instanceof WidgetApiResponseError && error.data.matrix_api_error) {
+        throw MatrixError.fromWidgetApiErrorData(error.data.matrix_api_error);
+    } else {
+        throw error;
+    }
+}

src/http-api/errors.ts

@@ -14,6 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import { IMatrixApiError as IWidgetMatrixError } from "matrix-widget-api";
+
 import { IUsageLimit } from "../@types/partials.ts";
 import { MatrixEvent } from "../models/event.ts";
 
@@ -131,6 +133,37 @@ export class MatrixError extends HTTPError {
         }
         return null;
     }
+
+    /**
+     * @returns this error expressed as a JSON payload
+     * for use by Widget API error responses.
+     */
+    public asWidgetApiErrorData(): IWidgetMatrixError {
+        const headers: Record<string, string> = {};
+        if (this.httpHeaders) {
+            for (const [name, value] of this.httpHeaders) {
+                headers[name] = value;
+            }
+        }
+        return {
+            http_status: this.httpStatus ?? 400,
+            http_headers: headers,
+            url: this.url ?? "",
+            response: {
+                errcode: this.errcode ?? "M_UNKNOWN",
+                error: this.data.error ?? "Unknown message",
+                ...this.data,
+            },
+        };
+    }
+
+    /**
+     * @returns a new {@link MatrixError} from a JSON payload
+     * received from Widget API error responses.
+     */
+    public static fromWidgetApiErrorData(data: IWidgetMatrixError): MatrixError {
+        return new MatrixError(data.response, data.http_status, data.url, undefined, new Headers(data.http_headers));
+    }
 }
 
 /**

yarn.lock

@@ -4940,10 +4940,10 @@ matrix-mock-request@^2.5.0:
   dependencies:
     expect "^28.1.0"
 
-matrix-widget-api@^1.8.2:
+matrix-widget-api@^1.10.0:
-  version "1.9.0"
+  version "1.10.0"
-  resolved "https://registry.yarnpkg.com/matrix-widget-api/-/matrix-widget-api-1.9.0.tgz#884136b405bd3c56e4ea285095c9e01ec52b6b1f"
+  resolved "https://registry.yarnpkg.com/matrix-widget-api/-/matrix-widget-api-1.10.0.tgz#d31ea073a5871a1fb1a511ef900b0c125a37bf55"
-  integrity sha512-au8mqralNDqrEvaVAkU37bXOb8I9SCe+ACdPk11QWw58FKstVq31q2wRz+qWA6J+42KJ6s1DggWbG/S3fEs3jw==
+  integrity sha512-rkAJ29briYV7TJnfBVLVSKtpeBrBju15JZFSDP6wj8YdbCu1bdmlplJayQ+vYaw1x4fzI49Q+Nz3E85s46sRDw==
   dependencies:
     "@types/events" "^3.0.0"
     events "^3.2.0"