mega changes, including updates and X

1 files changed, 37 insertions, 0 deletions

diff --git a/www/lib/localforage/src/utils/isIndexedDBValid.js b/www/lib/localforage/src/utils/isIndexedDBValid.js
new file mode 100644
index 00000000..aa14b6d8
--- /dev/null
+++ b/www/lib/localforage/src/utils/isIndexedDBValid.js
@@ -0,0 +1,37 @@
+import idb from './idb';
+
+function isIndexedDBValid() {
+    try {
+        // Initialize IndexedDB; fall back to vendor-prefixed versions
+        // if needed.
+        if (!idb) {
+            return false;
+        }
+        // We mimic PouchDB here; just UA test for Safari (which, as of
+        // iOS 8/Yosemite, doesn't properly support IndexedDB).
+        // IndexedDB support is broken and different from Blink's.
+        // This is faster than the test case (and it's sync), so we just
+        // do this. *SIGH*
+        // http://bl.ocks.org/nolanlawson/raw/c83e9039edf2278047e9/
+        //
+        // We test for openDatabase because IE Mobile identifies itself
+        // as Safari. Oh the lulz...
+        if (typeof openDatabase !== 'undefined' && typeof navigator !== 'undefined' &&
+            navigator.userAgent &&
+            /Safari/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgent)) {
+            return false;
+        }
+
+        return idb &&
+            typeof idb.open === 'function' &&
+                // Some Samsung/HTC Android 4.0-4.3 devices
+                // have older IndexedDB specs; if this isn't available
+                // their IndexedDB is too old for us to use.
+                // (Replaces the onupgradeneeded test.)
+            typeof IDBKeyRange !== 'undefined';
+    } catch (e) {
+        return false;
+    }
+}
+
+export default isIndexedDBValid;