Fix cache and storage issues in share and filepicker iframes

www/common/sframe-common-outer.js

@@ -81,8 +81,8 @@ define([
                     });
                     localStorage.CRYPTPAD_URLARGS = ApiConfig.requireConf.urlArgs;
                 }
-                var cache = {};
-                var localStore = {};
+                var cache = window.cpCache = {};
+                var localStore = window.localStore = {};
                 Object.keys(localStorage).forEach(function (k) {
                     if (k.indexOf('CRYPTPAD_CACHE|') === 0) {
                         cache[k.slice(('CRYPTPAD_CACHE|').length)] = localStorage[k];

www/filepicker/main.js

@@ -58,7 +58,7 @@ define([
                     // Remove the listener once we've received the READY message
                     window.removeEventListener('message', whenReady);
                     // Answer with the requested data
-                    postMsg(JSON.stringify({ txid: data.txid, language: Cryptpad.getLanguage() }));
+                    postMsg(JSON.stringify({ txid: data.txid, language: Cryptpad.getLanguage(), localStore: window.localStore, cache: window.cpCache }));
 
                     // Then start the channel
                     window.addEventListener('message', function (msg) {

www/share/main.js

@@ -60,7 +60,7 @@ define([
                     // Remove the listener once we've received the READY message
                     window.removeEventListener('message', whenReady);
                     // Answer with the requested data
-                    postMsg(JSON.stringify({ txid: data.txid, language: Cryptpad.getLanguage() }));
+                    postMsg(JSON.stringify({ txid: data.txid, language: Cryptpad.getLanguage(), localStore: window.localStore, cache: window.cpCache }));
 
                     // Then start the channel
                     window.addEventListener('message', function (msg) {
@@ -105,6 +105,21 @@ define([
 
                 config.addCommonRpc(sframeChan);
 
+                sframeChan.on('EV_CACHE_PUT', function (x) {
+                    Object.keys(x).forEach(function (k) {
+                        localStorage['CRYPTPAD_CACHE|' + k] = x[k];
+                    });
+                });
+                sframeChan.on('EV_LOCALSTORE_PUT', function (x) {
+                    Object.keys(x).forEach(function (k) {
+                        if (typeof(x[k]) === "undefined") {
+                            delete localStorage['CRYPTPAD_STORE|' + k];
+                            return;
+                        }
+                        localStorage['CRYPTPAD_STORE|' + k] = x[k];
+                    });
+                });
+
                 sframeChan.on('Q_GET_FILES_LIST', function (types, cb) {
                     Cryptpad.getSecureFilesList(types, function (err, data) {
                         cb({