From a214014ee82022f4e8bde410825644b6712a57dc Mon Sep 17 00:00:00 2001
From: Ezerous <ezerous@gmail.com>
Date: Wed, 9 Dec 2020 18:50:11 +0200
Subject: [PATCH] Add ability to purge IndexedDB

---
 packages/concordia-app/src/index.jsx          |  1 +
 .../MainLayout/MainLayoutMenu/index.jsx       | 11 +++++
 .../src/options/breezeOptions.js              |  1 +
 .../src/utils/indexedDB/indexedDBUtils.js     | 20 ++++++++
 .../src/utils/indexedDB/patchIndexedDB.js     | 46 +++++++++++++++++++
 5 files changed, 79 insertions(+)
 create mode 100644 packages/concordia-app/src/utils/indexedDB/indexedDBUtils.js
 create mode 100644 packages/concordia-app/src/utils/indexedDB/patchIndexedDB.js

diff --git a/packages/concordia-app/src/index.jsx b/packages/concordia-app/src/index.jsx
index 4f21227..a29f530 100644
--- a/packages/concordia-app/src/index.jsx
+++ b/packages/concordia-app/src/index.jsx
@@ -1,3 +1,4 @@
+import './utils/indexedDB/patchIndexedDB';
 import './utils/wdyr';
 import React, { Suspense } from 'react';
 import { render } from 'react-dom';
diff --git a/packages/concordia-app/src/layouts/MainLayout/MainLayoutMenu/index.jsx b/packages/concordia-app/src/layouts/MainLayout/MainLayoutMenu/index.jsx
index 11524eb..975c40c 100644
--- a/packages/concordia-app/src/layouts/MainLayout/MainLayoutMenu/index.jsx
+++ b/packages/concordia-app/src/layouts/MainLayout/MainLayoutMenu/index.jsx
@@ -5,6 +5,7 @@ import { useHistory } from 'react-router';
 import { useSelector } from 'react-redux';
 import AppContext from '../../../components/AppContext';
 import appLogo from '../../../assets/images/app_logo.png';
+import purgeIndexedDBs from '../../../utils/indexedDB/indexedDBUtils';
 
 const MainLayoutMenu = () => {
   const hasSignedUp = useSelector((state) => state.user.hasSignedUp);
@@ -56,6 +57,16 @@ const MainLayoutMenu = () => {
                                 {t('topbar.button.register')}
                             </Menu.Item>
                         )}
+                      <Menu.Item
+                        link
+                        name="purge"
+                        key="purge"
+                        onClick={async () => {
+                          await purgeIndexedDBs();
+                        }}
+                      >
+                          Purge
+                      </Menu.Item>
                   </Menu.Menu>
               </Menu>
           )}
diff --git a/packages/concordia-app/src/options/breezeOptions.js b/packages/concordia-app/src/options/breezeOptions.js
index 41984c0..3f3a15f 100644
--- a/packages/concordia-app/src/options/breezeOptions.js
+++ b/packages/concordia-app/src/options/breezeOptions.js
@@ -10,6 +10,7 @@ const REACT_APP_RENDEZVOUS_PORT = process.env.REACT_APP_RENDEZVOUS_PORT || REACT
 
 const breezeOptions = {
   ipfs: {
+    repo: 'concordia',
     config: {
       Addresses: {
         Swarm: [
diff --git a/packages/concordia-app/src/utils/indexedDB/indexedDBUtils.js b/packages/concordia-app/src/utils/indexedDB/indexedDBUtils.js
new file mode 100644
index 0000000..a44fdfa
--- /dev/null
+++ b/packages/concordia-app/src/utils/indexedDB/indexedDBUtils.js
@@ -0,0 +1,20 @@
+import { breeze } from '../../redux/store';
+
+async function purgeIndexedDBs() {
+  const { ipfs, orbit } = breeze;
+  if (orbit) await orbit.stop();
+  if (ipfs) await ipfs.stop();
+
+  const dbs = await indexedDB.databases();
+  await Promise.all(
+    dbs.map((db) => new Promise(
+      (resolve, reject) => {
+        const request = indexedDB.deleteDatabase(db.name);
+        request.onsuccess = resolve;
+        request.onerror = reject;
+      },
+    )),
+  );
+}
+
+export default purgeIndexedDBs;
diff --git a/packages/concordia-app/src/utils/indexedDB/patchIndexedDB.js b/packages/concordia-app/src/utils/indexedDB/patchIndexedDB.js
new file mode 100644
index 0000000..185ecda
--- /dev/null
+++ b/packages/concordia-app/src/utils/indexedDB/patchIndexedDB.js
@@ -0,0 +1,46 @@
+/* Patches browsers that do not yet support indexedDB.databases()
+  (https://developer.mozilla.org/en-US/docs/Web/API/IDBFactory/databases)
+  See also https://gist.github.com/rmehner/b9a41d9f659c9b1c3340#gistcomment-3449418) */
+if (window.indexedDB && typeof window.indexedDB.databases === 'undefined') {
+  const LOCALSTORAGE_CACHE_KEY = 'indexedDBDatabases';
+
+  // Store a key value map of databases
+  const getFromStorage = () => JSON.parse(window.localStorage[LOCALSTORAGE_CACHE_KEY] || '{}');
+
+  // Write the database to local storage
+  const writeToStorage = (value) => { window.localStorage[LOCALSTORAGE_CACHE_KEY] = JSON.stringify(value); };
+
+  IDBFactory.prototype.databases = () => Promise.resolve(
+    Object.entries(getFromStorage()).reduce((acc, [name, version]) => {
+      acc.push({ name, version });
+      return acc;
+    }, []),
+  );
+
+  // Intercept the existing open handler to write our DBs names
+  // and versions to localStorage
+  const { open } = IDBFactory.prototype;
+
+  // eslint-disable-next-line func-names
+  IDBFactory.prototype.open = function (...args) {
+    const dbName = args[0];
+    const version = args[1] || 1;
+    const existing = getFromStorage();
+    writeToStorage({ ...existing, [dbName]: version });
+    return open.apply(this, args);
+  };
+
+  // Intercept the existing deleteDatabase handler remove our
+  // dbNames from localStorage
+  const { deleteDatabase } = IDBFactory.prototype;
+
+  // eslint-disable-next-line func-names
+  IDBFactory.prototype.deleteDatabase = function (...args) {
+    const dbName = args[0];
+    const existing = getFromStorage();
+    delete existing[dbName];
+    writeToStorage(existing);
+    return deleteDatabase.apply(this, args);
+  };
+  console.debug('IndexedDB patched successfully!');
+}