Preload: refactor actions, add MASTODON_PRELOAD_IMPORT action

app/soapbox/actions/preload.js

@@ -1,25 +1,57 @@
 import { mapValues } from 'lodash';
 
-export const PLEROMA_PRELOAD_IMPORT = 'PLEROMA_PRELOAD_IMPORT';
+export const PLEROMA_PRELOAD_IMPORT  = 'PLEROMA_PRELOAD_IMPORT';
+export const MASTODON_PRELOAD_IMPORT = 'MASTODON_PRELOAD_IMPORT';
 
 // https://git.pleroma.social/pleroma/pleroma-fe/-/merge_requests/1176/diffs
-const decodeUTF8Base64 = (data) => {
+const decodeUTF8Base64 = data => {
   const rawData = atob(data);
   const array = Uint8Array.from(rawData.split('').map((char) => char.charCodeAt(0)));
   const text = new TextDecoder().decode(array);
   return text;
 };
 
-const decodeData = data =>
+const decodePleromaData = data => {
-  mapValues(data, base64string =>
+  return mapValues(data, base64string => JSON.parse(decodeUTF8Base64(base64string)));
-    JSON.parse(decodeUTF8Base64(base64string)));
+};
 
-export function preload() {
+const pleromaDecoder = json => decodePleromaData(JSON.parse(json));
-  const element = document.getElementById('initial-results');
-  const data = element ? JSON.parse(element.textContent) : {};
 
-  return {
+// This will throw if it fails.
-    type: PLEROMA_PRELOAD_IMPORT,
+// Should be called inside a try-catch.
-    data: decodeData(data),
+const decodeFromMarkup = (elementId, decoder) => {
+  const { textContent } = document.getElementById(elementId);
+  return decoder(textContent);
+};
+
+function preloadFromMarkup(elementId, decoder, action) {
+  return (dispatch, getState) => {
+    try {
+      const data = decodeFromMarkup(elementId, decoder);
+      dispatch(action(data));
+    } catch {
+      // Do nothing
+    }
+  };
+}
+
+export function preload() {
+  return (dispatch, getState) => {
+    dispatch(preloadFromMarkup('initial-results', pleromaDecoder, preloadPleroma));
+    dispatch(preloadFromMarkup('initial-state', JSON.parse, preloadMastodon));
+  };
+}
+
+export function preloadPleroma(data) {
+  return {
+    type: PLEROMA_PRELOAD_IMPORT,
+    data,
+  };
+}
+
+export function preloadMastodon(data) {
+  return {
+    type: MASTODON_PRELOAD_IMPORT,
+    data,
   };
 }