Add m-esr52 at 52.6.0

1 files changed, 186 insertions, 0 deletions

diff --git a/dom/push/test/webpush.js b/dom/push/test/webpush.js
new file mode 100644
index 000000000..6aacc5ae1
--- /dev/null
+++ b/dom/push/test/webpush.js
@@ -0,0 +1,186 @@
+/*
+ * Browser-based Web Push client for the application server piece.
+ *
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ *
+ * Uses the WebCrypto API.
+ * Uses the fetch API.  Polyfill: https://github.com/github/fetch
+ */
+
+(function (g) {
+  'use strict';
+
+  var P256DH = {
+    name: 'ECDH',
+    namedCurve: 'P-256'
+  };
+  var webCrypto = g.crypto.subtle;
+  var ENCRYPT_INFO = new TextEncoder('utf-8').encode("Content-Encoding: aesgcm128");
+  var NONCE_INFO = new TextEncoder('utf-8').encode("Content-Encoding: nonce");
+
+  function chunkArray(array, size) {
+    var start = array.byteOffset || 0;
+    array = array.buffer || array;
+    var index = 0;
+    var result = [];
+    while(index + size <= array.byteLength) {
+      result.push(new Uint8Array(array, start + index, size));
+      index += size;
+    }
+    if (index < array.byteLength) {
+      result.push(new Uint8Array(array, start + index));
+    }
+    return result;
+  }
+
+  /* I can't believe that this is needed here, in this day and age ...
+   * Note: these are not efficient, merely expedient.
+   */
+  var base64url = {
+    _strmap: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_',
+    encode: function(data) {
+      data = new Uint8Array(data);
+      var len = Math.ceil(data.length * 4 / 3);
+      return chunkArray(data, 3).map(chunk => [
+        chunk[0] >>> 2,
+        ((chunk[0] & 0x3) << 4) | (chunk[1] >>> 4),
+        ((chunk[1] & 0xf) << 2) | (chunk[2] >>> 6),
+        chunk[2] & 0x3f
+      ].map(v => base64url._strmap[v]).join('')).join('').slice(0, len);
+    },
+    _lookup: function(s, i) {
+      return base64url._strmap.indexOf(s.charAt(i));
+    },
+    decode: function(str) {
+      var v = new Uint8Array(Math.floor(str.length * 3 / 4));
+      var vi = 0;
+      for (var si = 0; si < str.length;) {
+        var w = base64url._lookup(str, si++);
+        var x = base64url._lookup(str, si++);
+        var y = base64url._lookup(str, si++);
+        var z = base64url._lookup(str, si++);
+        v[vi++] = w << 2 | x >>> 4;
+        v[vi++] = x << 4 | y >>> 2;
+        v[vi++] = y << 6 | z;
+      }
+      return v;
+    }
+  };
+
+  g.base64url = base64url;
+
+  /* Coerces data into a Uint8Array */
+  function ensureView(data) {
+    if (typeof data === 'string') {
+      return new TextEncoder('utf-8').encode(data);
+    }
+    if (data instanceof ArrayBuffer) {
+      return new Uint8Array(data);
+    }
+    if (ArrayBuffer.isView(data)) {
+      return new Uint8Array(data.buffer);
+    }
+    throw new Error('webpush() needs a string or BufferSource');
+  }
+
+  function bsConcat(arrays) {
+    var size = arrays.reduce((total, a) => total + a.byteLength, 0);
+    var index = 0;
+    return arrays.reduce((result, a) => {
+      result.set(new Uint8Array(a), index);
+      index += a.byteLength;
+      return result;
+    }, new Uint8Array(size));
+  }
+
+  function hmac(key) {
+    this.keyPromise = webCrypto.importKey('raw', key, { name: 'HMAC', hash: 'SHA-256' },
+                                          false, ['sign']);
+  }
+  hmac.prototype.hash = function(input) {
+    return this.keyPromise.then(k => webCrypto.sign('HMAC', k, input));
+  };
+
+  function hkdf(salt, ikm) {
+    this.prkhPromise = new hmac(salt).hash(ikm)
+      .then(prk => new hmac(prk));
+  }
+
+  hkdf.prototype.generate = function(info, len) {
+    var input = bsConcat([info, new Uint8Array([1])]);
+    return this.prkhPromise
+      .then(prkh => prkh.hash(input))
+      .then(h => {
+        if (h.byteLength < len) {
+          throw new Error('Length is too long');
+        }
+        return h.slice(0, len);
+      });
+  };
+
+  /* generate a 96-bit IV for use in GCM, 48-bits of which are populated */
+  function generateNonce(base, index) {
+    var nonce = base.slice(0, 12);
+    for (var i = 0; i < 6; ++i) {
+      nonce[nonce.length - 1 - i] ^= (index / Math.pow(256, i)) & 0xff;
+    }
+    return nonce;
+  }
+
+  function encrypt(localKey, remoteShare, salt, data) {
+    return webCrypto.importKey('raw', remoteShare, P256DH, false, ['deriveBits'])
+      .then(remoteKey =>
+            webCrypto.deriveBits({ name: P256DH.name, public: remoteKey },
+                                 localKey, 256))
+      .then(rawKey => {
+        var kdf = new hkdf(salt, rawKey);
+        return Promise.all([
+          kdf.generate(ENCRYPT_INFO, 16)
+            .then(gcmBits =>
+                  webCrypto.importKey('raw', gcmBits, 'AES-GCM', false, ['encrypt'])),
+          kdf.generate(NONCE_INFO, 12)
+        ]);
+      })
+      .then(([key, nonce]) => {
+        if (data.byteLength === 0) {
+          // Send an authentication tag for empty messages.
+          return webCrypto.encrypt({
+            name: 'AES-GCM',
+            iv: generateNonce(nonce, 0)
+          }, key, new Uint8Array([0])).then(value => [value]);
+        }
+        // 4096 is the default size, though we burn 1 for padding
+        return Promise.all(chunkArray(data, 4095).map((slice, index) => {
+          var padded = bsConcat([new Uint8Array([0]), slice]);
+          return webCrypto.encrypt({
+            name: 'AES-GCM',
+            iv: generateNonce(nonce, index)
+          }, key, padded);
+        }));
+      }).then(bsConcat);
+  }
+
+  function webPushEncrypt(subscription, data) {
+    data = ensureView(data);
+
+    var salt = g.crypto.getRandomValues(new Uint8Array(16));
+    return webCrypto.generateKey(P256DH, false, ['deriveBits'])
+      .then(localKey => {
+        return Promise.all([
+          encrypt(localKey.privateKey, subscription.getKey("p256dh"), salt, data),
+          // 1337 p-256 specific haxx to get the raw value out of the spki value
+          webCrypto.exportKey('raw', localKey.publicKey),
+        ]);
+      }).then(([payload, pubkey]) => {
+        return {
+          data: base64url.encode(payload),
+          encryption: 'keyid=p256dh;salt=' + base64url.encode(salt),
+          encryption_key: 'keyid=p256dh;dh=' + base64url.encode(pubkey),
+          encoding: 'aesgcm128'
+        };
+      });
+  }
+
+  g.webPushEncrypt = webPushEncrypt;
+}(this));