Use fetch instead of jQuery

app/javascript/components/TypesDeChampEditor/OperationsQueue.js

@@ -1,4 +1,4 @@
-import { to, getJSON } from '@utils';
+import { getJSON } from '@utils';
 
 export default class OperationsQueue {
   constructor(baseUrl) {
@@ -30,23 +30,27 @@ export default class OperationsQueue {
   async exec(operation) {
     const { path, method, payload, resolve, reject } = operation;
     const url = `${this.baseUrl}${path}`;
-    const [data, xhr] = await to(getJSON(url, payload, method));
 
-    if (xhr) {
-      handleError(xhr, reject);
-    } else {
+    try {
+      const data = await getJSON(url, payload, method);
       resolve(data);
+    } catch (e) {
+      handleError(e, reject);
     }
   }
 }
 
-function handleError(xhr, reject) {
+async function handleError({ response, message }, reject) {
+  if (response) {
     try {
       const {
         errors: [message]
-    } = JSON.parse(xhr.responseText);
+      } = await response.json();
+      reject(message);
+    } catch {
+      reject(await response.text());
+    }
+  } else {
     reject(message);
-  } catch (e) {
-    reject(xhr.responseText);
   }
 }

app/javascript/packs/application-old.js

@@ -5,7 +5,6 @@ import jQuery from 'jquery';
 
 import '../shared/page-update-event';
 import '../shared/activestorage/ujs';
-import '../shared/rails-ujs-fix';
 import '../shared/safari-11-file-xhr-workaround';
 import '../shared/remote-input';
 import '../shared/franceconnect';

app/javascript/packs/application.js

@@ -7,7 +7,6 @@ import ReactRailsUJS from 'react_ujs';
 import '../shared/page-update-event';
 import '../shared/activestorage/ujs';
 import '../shared/remote-poller';
-import '../shared/rails-ujs-fix';
 import '../shared/safari-11-file-xhr-workaround';
 import '../shared/remote-input';
 import '../shared/franceconnect';

app/javascript/shared/rails-ujs-fix.js

@@ -1,20 +0,0 @@
-import jQuery from 'jquery';
-
-// rails-ujs installs CSRFProtection for its own ajax implementation. We might need
-// CSRFProtection for jQuery initiated requests. This code is from jquery-ujs.
-jQuery.ajaxPrefilter((options, originalOptions, xhr) => {
-  if (!options.crossDomain) {
-    CSRFProtection(xhr);
-  }
-});
-
-function csrfToken() {
-  return jQuery('meta[name=csrf-token]').attr('content');
-}
-
-function CSRFProtection(xhr) {
-  let token = csrfToken();
-  if (token) {
-    xhr.setRequestHeader('X-CSRF-Token', token);
-  }
-}

app/javascript/shared/utils.js

@@ -1,9 +1,8 @@
 import Rails from '@rails/ujs';
-import $ from 'jquery';
 import debounce from 'debounce';
 
 export { debounce };
-export const { fire } = Rails;
+export const { fire, csrfToken } = Rails;
 
 export function show(el) {
   el && el.classList.remove('hidden');
@@ -67,17 +66,20 @@ export function ajax(options) {
   });
 }
 
-export function getJSON(url, data, method = 'get') {
-  data = method !== 'get' && data ? JSON.stringify(data) : data;
-  return Promise.resolve(
-    $.ajax({
-      method,
-      url,
-      data,
-      contentType: 'application/json',
-      dataType: 'json'
-    })
-  );
+export function getJSON(url, data, method = 'GET') {
+  const { query, ...options } = fetchOptions(data, method);
+
+  return fetch(`${url}${query}`, options).then((response) => {
+    if (response.ok) {
+      if (response.status === 204) {
+        return null;
+      }
+      return response.json();
+    }
+    const error = new Error(response.statusText || response.status);
+    error.response = response;
+    throw error;
+  });
 }
 
 export function scrollTo(container, scrollTo) {
@@ -95,10 +97,6 @@ export function on(selector, eventName, fn) {
   );
 }
 
-export function to(promise) {
-  return promise.then((result) => [result]).catch((error) => [null, error]);
-}
-
 export function isNumeric(n) {
   return !isNaN(parseFloat(n)) && isFinite(n);
 }
@@ -120,3 +118,50 @@ export function timeoutable(promise, timeoutDelay) {
   });
   return Promise.race([promise, timeoutPromise]);
 }
+
+const FETCH_TIMEOUT = 30 * 1000; // 30 sec
+
+function fetchOptions(data, method = 'GET') {
+  const options = {
+    query: '',
+    method: method.toUpperCase(),
+    headers: {
+      accept: 'application/json',
+      'x-csrf-token': csrfToken(),
+      'x-requested-with': 'XMLHttpRequest'
+    },
+    credentials: 'same-origin'
+  };
+
+  if (data) {
+    if (options.method === 'GET') {
+      options.query = objectToQuerystring(data);
+    } else {
+      options.headers['content-type'] = 'application/json';
+      options.body = JSON.stringify(data);
+    }
+  }
+
+  if (window.AbortController) {
+    const controller = new AbortController();
+    options.signal = controller.signal;
+
+    setTimeout(() => {
+      controller.abort();
+    }, FETCH_TIMEOUT);
+  }
+
+  return options;
+}
+
+function objectToQuerystring(obj) {
+  return Object.keys(obj).reduce(function (query, key, i) {
+    return [
+      query,
+      i === 0 ? '?' : '&',
+      encodeURIComponent(key),
+      '=',
+      encodeURIComponent(obj[key])
+    ].join('');
+  }, '');
+}