feat: Add custom error for cloudflare block

Author: relekang

src/errors.ts

@@ -147,6 +147,12 @@ export class InvalidUrlError extends BaseError {
 	}
 }
 
+export class CloudflareBlockError extends BaseError {
+	constructor() {
+		super("Blocked by cloudflare", "cloudflare-block");
+	}
+}
+
 export function createErrorFormatter(
 	Sentry: any,
 ): ApolloServerOptions<any>["formatError"] {

src/request.ts

@@ -4,6 +4,7 @@ import _debug from "debug";
 const debug = _debug("graphql-rss-parser:request");
 
 import {
+	CloudflareBlockError,
 	ConnectionRefusedError,
 	DnsLookupError,
 	EmptyHttpResponseError,
@@ -43,6 +44,15 @@ export default async function request(url: string) {
 	} catch (error: any) {
 		debug(`request to ${url} failed with error`, error);
 		if (error.response?.status) {
+			if (error.response?.status === 403) {
+				const text = error.response.data.toString();
+				if (
+					text.includes("Enable JavaScript and cookies to continue") &&
+					text.includes("_cf_")
+				) {
+					throw new CloudflareBlockError();
+				}
+			}
 			throw new UpstreamHttpError("Upstream HTTP error", error.response.status);
 		}
 		if (error.code === "ENOTFOUND" || error.code === "EAI_AGAIN") {