Merge branch 'master' of https://github.com/invertase/react-native-firebase into functions

lib/utils/Base64.js

@@ -0,0 +1,68 @@
+// @flow
+/* eslint-disable */
+
+const CHARS =
+  'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
+
+export default {
+  /**
+   * window.btoa
+   */
+  btoa(input: string = ''): string {
+    let map;
+    let i = 0;
+    let block = 0;
+    let output = '';
+
+    // eslint-disable-next-line
+    for (
+      block = 0, i = 0, map = CHARS;
+      input.charAt(i | 0) || ((map = '='), i % 1);
+      output += map.charAt(63 & (block >> (8 - (i % 1) * 8)))
+    ) {
+      const charCode = input.charCodeAt((i += 3 / 4));
+
+      if (charCode > 0xff) {
+        throw new Error(
+          "'RNFirebase.utils.btoa' failed: The string to be encoded contains characters outside of the Latin1 range."
+        );
+      }
+
+      block = (block << 8) | charCode;
+    }
+
+    return output;
+  },
+
+  /**
+   * window.atob
+   */
+  atob(input: string = ''): string {
+    let i = 0;
+    let bc = 0;
+    let bs = 0;
+    let buffer;
+    let output = '';
+
+    const str = input.replace(/=+$/, '');
+
+    if (str.length % 4 === 1) {
+      throw new Error(
+        "'RNFirebase.utils.atob' failed: The string to be decoded is not correctly encoded."
+      );
+    }
+
+    // eslint-disable-next-line
+    for (
+      bc = 0, bs = 0, i = 0;
+      (buffer = str.charAt(i++));
+      ~buffer && ((bs = bc % 4 ? bs * 64 + buffer : buffer), bc++ % 4)
+        ? (output += String.fromCharCode(255 & (bs >> ((-2 * bc) & 6))))
+        : 0
+    ) {
+      buffer = CHARS.indexOf(buffer);
+    }
+
+    return output;
+  },
+};