feat: added fetch service

ember/app/services/fetch.js

@@ -0,0 +1,51 @@
+import Service, { service } from '@ember/service';
+import { isEmpty } from '@ember/utils';
+import { handleUnauthorized } from 'ember-simple-auth-oidc';
+import fetch from 'fetch';
+
+const CONTENT_TYPE = 'application/vnd.api+json';
+
+const cleanObject = (obj) =>
+  Object.fromEntries(
+    // eslint-disable-next-line no-unused-vars
+    Object.entries(obj).filter(([key, value]) => !isEmpty(value))
+  );
+
+export default class FetchService extends Service {
+  @service session;
+
+  async fetch(resource, options = {}) {
+    await this.session.refreshAuthentication.perform();
+
+    options.headers = cleanObject({
+      ...this.session.headers,
+      accept: CONTENT_TYPE,
+      'content-type': CONTENT_TYPE,
+      ...(options.headers || {}),
+    });
+
+    const response = await fetch(resource, options);
+
+    if (!response.ok) {
+      if (response.status === 401) {
+        return handleUnauthorized(this.session);
+      }
+
+      const contentType = response.headers.get('content-type');
+      let body = '';
+
+      if (/^application\/(vnd\.api+)?json$/.test(contentType)) {
+        body = await response.json();
+      } else if (contentType === 'text/plain') {
+        body = await response.text();
+      }
+
+      // throw an error containing a human readable message
+      throw new Error(
+        `Fetch request to URL ${response.url} returned ${response.status} ${response.statusText}:\n\n${body}`
+      );
+    }
+
+    return response;
+  }
+}