chore: improve error handing for fetch function (#267)

Signed-off-by: Mirko Mollik <[email protected]>

Author: cre8

packages/sd-jwt-vc/src/sd-jwt-vc-config.ts

@@ -16,4 +16,6 @@ export type SDJWTVCConfig = SDJWTConfig & {
   vctFetcher?: VcTFetcher;
   // if set to true, it will load the metadata format based on the vct value. If not provided, it will default to false.
   loadTypeMetadataFormat?: boolean;
+  // timeout value in milliseconds when to abort the fetch request. If not provided, it will default to 10000.
+  timeout?: number;
 };

packages/sd-jwt-vc/src/sd-jwt-vc-instance.ts

@@ -166,18 +166,31 @@ export class SDJwtVcInstance extends SDJwtInstance<SdJwtVcPayload> {
    * @param url
    * @returns
    */
-  private async fetch<T>(url: string, integrity?: string) {
+  private async fetch<T>(url: string, integrity?: string): Promise<T> {
     const controller = new AbortController();
-    const timeoutId = setTimeout(() => controller.abort(), 10000);
+    const timeoutId = setTimeout(
+      () => controller.abort(),
+      this.userConfig.timeout ?? 10000,
+    );
+
     try {
       const response = await fetch(url, {
         signal: controller.signal,
       });
+
       if (!response.ok) {
-        throw new Error(await response.text());
+        const errorText = await response.text();
+        throw new Error(
+          `Error fetching ${url}: ${response.status} ${response.statusText} - ${errorText}`,
+        );
       }
       await this.validateIntegrity(response.clone(), url, integrity);
       return response.json() as Promise<T>;
+    } catch (error) {
+      if (error instanceof DOMException && error.name === 'AbortError') {
+        throw new Error(`Request to ${url} timed out`);
+      }
+      throw error;
     } finally {
       clearTimeout(timeoutId);
     }