improve error message when fail to get keys from torus.js

src/login.ts

@@ -24,6 +24,7 @@ import {
 import { registerServiceWorker } from "./registerServiceWorker";
 import SentryHandler from "./sentry";
 import { AGGREGATE_VERIFIER, LOGIN, SENTRY_TXNS, TORUS_METHOD, UX_MODE, UX_MODE_TYPE } from "./utils/enums";
+import { serializeError } from "./utils/error";
 import { handleRedirectParameters, isFirefox, padUrlString } from "./utils/helpers";
 import log from "./utils/loglevel";
 import StorageHelper from "./utils/StorageHelper";
@@ -496,9 +497,10 @@ class CustomAuth {
         result = await this.triggerHybridAggregateLogin(methodArgs);
       }
     } catch (err: unknown) {
-      log.error(err);
+      const serializedError = await serializeError(err);
+      log.error(serializedError);
       return {
-        error: `Could not get result from torus nodes \n ${(err as Error)?.message || ""}`,
+        error: `Could not get result from torus nodes. \n ${serializedError.message || ""}`,
         state: instanceParameters || {},
         method,
         result: {},

src/utils/error.ts

@@ -0,0 +1,26 @@
+export const serializeError = async (error: unknown): Promise<Error> => {
+  // Find first Error or create an "unknown" Error to keep stack trace.
+  const isError = error instanceof Error;
+  const isString = typeof error === "string";
+  const isApiErrorIndex = error && typeof error === "object" && "status" in error && "type" in error;
+  let err: Error;
+  if (isApiErrorIndex) {
+    const apiError = error as Response;
+    const contentType = apiError.headers.get("content-type");
+    if (contentType.includes("application/json")) {
+      const errJson = await apiError.json();
+      err = new Error(errJson?.error || errJson?.message || JSON.stringify(errJson));
+    } else if (contentType.includes("text/plain")) {
+      err = new Error(await apiError.text());
+    } else {
+      err = new Error(`${apiError.status} ${apiError.type.toString()} ${apiError.statusText}`);
+    }
+  } else if (isString) {
+    err = new Error(error as string);
+  } else if (isError) {
+    err = error as Error;
+  } else {
+    err = new Error("Unknown error");
+  }
+  return err;
+};