fix internal server error handling in the SDK

Author: manu4543

package.json

@@ -1,6 +1,6 @@
 {
   "name": "imagekit",
-  "version": "4.1.2",
+  "version": "4.1.3",
   "description": "Offical NodeJS SDK for ImageKit.io integration",
   "main": "./dist/index.js",
   "types": "./dist/index.d.ts",

tests/response-metadata.js

@@ -20,6 +20,8 @@ const dummyAPIErrorResponse = {
     message: "message"
 }
 
+const dummyAPIErrorResponseString = "Internal server error"
+
 const responseHeaders = {
     'x-request-id': "request-id"
 }
@@ -65,4 +67,28 @@ describe("Promise", function () {
 
         return Promise.reject();
     });
+
+    it('Server unhandled error', async function () {
+        var requestId = "sdfdsfksjfldsjfjsdf";
+
+        const scope = nock('https://api.imagekit.io')
+            .get(`/v1/files/purge/${requestId}`)
+            .basicAuth({ user: initializationParams.privateKey, pass: '' })
+            .reply(500, dummyAPIErrorResponseString, responseHeaders)
+
+        try {
+            await imagekit.getPurgeCacheStatus(requestId);
+        } catch (ex) {
+            expect(ex).to.be.deep.equal({
+                help: dummyAPIErrorResponseString
+            });
+            expect(ex.$ResponseMetadata.statusCode).to.be.equal(500);
+            expect(ex.$ResponseMetadata.headers).to.be.deep.equal({
+                ...responseHeaders
+            });
+            return Promise.resolve();
+        }
+
+        return Promise.reject();
+    });
 });

utils/request.ts

@@ -4,7 +4,7 @@ import { ImageKitOptions } from "../libs/interfaces/";
 import { IKCallback } from "../libs/interfaces/IKCallback";
 import axios, { AxiosError, AxiosRequestConfig, AxiosResponse } from "axios";
 
-export default function request<T, E extends Error> (
+export default function request<T, E extends Error>(
   requestOptions: RequestOptions,
   defaultOptions: ImageKitOptions,
   callback?: IKCallback<T, E>,
@@ -50,8 +50,16 @@ export default function request<T, E extends Error> (
         statusCode: error.response.status,
         headers: error.response.headers
       }
-      // define status code and headers as non-enumerable properties on data
-      var result = error.response.data ? error.response.data : {} as any;
+
+      var result = {} as Object;
+      if (error.response.data && typeof error.response.data === "object") {
+        result = error.response.data
+      } else if (error.response.data && typeof error.response.data === "string") {
+        result = {
+          help: error.response.data
+        }
+      }
+
       if (error.response.status === 429) {
         result = {
           ...result,
@@ -60,6 +68,7 @@ export default function request<T, E extends Error> (
           "X-RateLimit-Interval": parseInt(error.response.headers["x-ratelimit-interval"], 10),
         }
       }
+      // define status code and headers as non-enumerable properties on data
       Object.defineProperty(result, "$ResponseMetadata", {
         value: responseMetadata,
         enumerable: false,