add GuildAPIInvalidResponse

src/error.ts

@@ -43,4 +43,40 @@ class GuildSDKValidationError<Err extends ZodError<any>> extends Error {
   }
 }
 
-export { GuildAPICallFailed, GuildSDKValidationError };
+class GuildAPIInvalidResponse extends Error {
+  responseText: string;
+
+  responseCode: number;
+
+  url: string;
+
+  method: string;
+
+  body: any;
+
+  constructor({
+    responseText,
+    response,
+    url,
+    method,
+    body,
+  }: {
+    responseText: string;
+    response: Response;
+    url: string;
+    method: string;
+    body: any;
+  }) {
+    super(
+      "Guild API returned invalid data. Please open an issue: https://github.com/guildxyz/guild-sdk/issues"
+    );
+
+    this.responseCode = response.status;
+    this.responseText = responseText;
+    this.url = url;
+    this.method = method;
+    this.body = body;
+  }
+}
+
+export { GuildAPICallFailed, GuildAPIInvalidResponse, GuildSDKValidationError };

src/index.ts

@@ -1,4 +1,7 @@
 export { default as createGuildClient, type GuildClient } from "./client";
-export { GuildAPICallFailed, GuildSDKValidationError } from "./error";
+export {
+  GuildAPICallFailed,
+  GuildAPIInvalidResponse,
+  GuildSDKValidationError,
+} from "./error";
 export { createSigner } from "./utils";
-

src/utils.ts

@@ -4,7 +4,11 @@ import { keccak256, type Wallet } from "ethers";
 import randomBytes from "randombytes";
 import type { z } from "zod";
 import { globals } from "./common";
-import { GuildAPICallFailed, GuildSDKValidationError } from "./error";
+import {
+  GuildAPICallFailed,
+  GuildAPIInvalidResponse,
+  GuildSDKValidationError,
+} from "./error";
 
 export const recreateMessage = (params: Schemas["Authentication"]["params"]) =>
   `${params.msg}\n\nAddress: ${params.addr}\nMethod: ${params.method}${
@@ -163,15 +167,16 @@ export const callGuildAPI = async <ResponseType>(
 
   const isPrivileged = "headers" in (authentication ?? {});
 
+  const body = // eslint-disable-next-line no-nested-ternary
+    params.method === "GET"
+      ? undefined
+      : isPrivileged
+      ? JSON.stringify(parsedPayload)
+      : JSON.stringify(authentication ?? parsedPayload);
+
   const response = await fetch(url, {
     method: params.method,
-    body:
-      // eslint-disable-next-line no-nested-ternary
-      params.method === "GET"
-        ? undefined
-        : isPrivileged
-        ? JSON.stringify(parsedPayload)
-        : JSON.stringify(authentication ?? parsedPayload),
+    body,
     headers: {
       ...(params.method === "GET" && authentication && !isPrivileged
         ? {
@@ -191,7 +196,23 @@ export const callGuildAPI = async <ResponseType>(
     },
   });
 
-  const responseBody = await response.json();
+  const responseBody = await response
+    .json()
+    .catch(() => "FAILED_TO_PARSE_RESPONSE_JSON");
+
+  if (responseBody === "FAILED_TO_PARSE_RESPONSE_JSON") {
+    const responseText = await response
+      .text()
+      .catch(() => "FAILED_TO_PARSE_RESPONSE_TEXT");
+
+    throw new GuildAPIInvalidResponse({
+      responseText,
+      response,
+      url,
+      method: params.method,
+      body,
+    });
+  }
 
   if (!response.ok) {
     throw new GuildAPICallFailed(