feat: better result errors

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 * Remove Travis CI - [products/#97](https://github.com/ripe-tech/products/issues/97)
+* Better verification of response errors and error message
 
 ### Fixed
 

js/base.js

@@ -1,4 +1,4 @@
-import { API as BaseAPI, mix, load, conf } from "yonius";
+import { API as BaseAPI, mix, load, conf, verify } from "yonius";
 
 import { InvoiceAPI } from "./invoice";
 import { SequenceAPI } from "./sequence";
@@ -28,4 +28,39 @@ export class API extends mix(BaseAPI).with(InvoiceAPI, SequenceAPI, TaxAPI) {
         options.params = options.params !== undefined ? options.params : {};
         options.params.api_key = this.apiKey;
     }
+
+    async _handleResponse(response, errorMessage = "Problem in request") {
+        const result = await this._getResult(response);
+        const errors = result.errors ? JSON.stringify(result.errors) : null;
+        verify(!errors, errors, response.status || 500);
+        verify(response.ok, errorMessage, response.status || 500);
+        return result;
+    }
+
+    /**
+     * Obtains the response object from the provided response making sure that the
+     * content type is respected when doing so.
+     *
+     * @param {Response} response The HTTP response resulting from the request
+     * made by the API client
+     * @returns {Object|String|Blob} The parsed result value for the provided
+     * response object taking into account the content type of it.
+     */
+    async _getResult(response) {
+        let result = null;
+        if (
+            response.headers.get("content-type") &&
+            response.headers.get("content-type").toLowerCase().startsWith("application/json")
+        ) {
+            result = await response.json();
+        } else if (
+            response.headers.get("content-type") &&
+            response.headers.get("content-type").toLowerCase().startsWith("text/")
+        ) {
+            result = await response.text();
+        } else {
+            result = await response.blob();
+        }
+        return result;
+    }
 }