Delete the audio modem and copresence private APIs.

chrome/browser/resources/whispernet_proxy/js/wrapper.js

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-'use strict';
-
-/**
- * Function to convert an array of bytes to a base64 string
- * TODO(rkc): Change this to use a Uint8array instead of a string.
- * @param {string} bytes String containing the bytes we want to convert.
- * @return {string} String containing the base64 representation.
- */
-function bytesToBase64(bytes) {
-  var bstr = '';
-  for (var i = 0; i < bytes.length; ++i)
-    bstr += String.fromCharCode(bytes[i]);
-  return btoa(bstr).replace(/=/g, '');
-}
-
-/**
- * Function to convert a string to an array of bytes.
- * @param {string} str String to convert.
- * @return {Array} Array containing the string.
- */
-function stringToArray(str) {
-  var buffer = [];
-  for (var i = 0; i < str.length; ++i)
-    buffer[i] = str.charCodeAt(i);
-  return buffer;
-}
-
-/**
- * Creates a whispernet encoder.
- * @constructor
- * @param {Object} params Audio parameters for the whispernet encoder.
- * @param {Object} whisperNacl The NaclBridge object, used to communicate with
- *     the whispernet wrapper.
- * @param {string} clientId A string identifying the requester.
- */
-function WhisperEncoder(params, whisperNacl, clientId) {
-  this.whisperNacl_ = whisperNacl;
-  this.whisperNacl_.addListener(this.onNaclMessage_.bind(this));
-  this.clientId_ = clientId;
-
-  var msg = {
-    type: 'initialize_encoder',
-    client_id: clientId,
-    params: params
-  };
-
-  this.whisperNacl_.send(msg);
-}
-
-/**
- * Method to encode a token.
- * @param {Object} params Encode token parameters object.
- */
-WhisperEncoder.prototype.encode = function(params) {
-  // Pad the token before decoding it.
-  var token = params.token.token;
-  while (token.length % 4 > 0)
-    token += '=';
-
-  var msg = {
-    type: 'encode_token',
-    client_id: this.clientId_,
-    // Trying to send the token in binary form to Nacl doesn't work correctly.
-    // We end up with the correct string + a bunch of extra characters. This is
-    // true of returning a binary string too; hence we communicate back and
-    // forth by converting the bytes into an array of integers.
-    token: stringToArray(atob(token)),
-    repetitions: params.repetitions,
-    use_dtmf: params.token.audible,
-    use_crc: params.tokenParams.crc,
-    use_parity: params.tokenParams.parity
-  };
-
-  this.whisperNacl_.send(msg);
-};
-
-/**
- * Method to handle messages from the whispernet NaCl wrapper.
- * @param {Event} e Event from the whispernet wrapper.
- * @private
- */
-WhisperEncoder.prototype.onNaclMessage_ = function(e) {
-  var msg = e.data;
-  if (msg.type == 'encode_token_response' && msg.client_id == this.clientId_) {
-    chrome.copresencePrivate.sendSamples(this.clientId_,
-        { token: bytesToBase64(msg.token), audible: msg.audible }, msg.samples);
-  }
-};
-
-/**
- * Creates a whispernet decoder.
- * @constructor
- * @param {Object} params Audio parameters for the whispernet decoder.
- * @param {Object} whisperNacl The NaclBridge object, used to communicate with
- *     the whispernet wrapper.
- * @param {string} clientId A string identifying the requester.
- */
-function WhisperDecoder(params, whisperNacl, clientId) {
-  this.whisperNacl_ = whisperNacl;
-  this.whisperNacl_.addListener(this.onNaclMessage_.bind(this));
-  this.clientId_ = clientId;
-
-  var msg = {
-    type: 'initialize_decoder',
-    client_id: clientId,
-    params: params
-  };
-  this.whisperNacl_.send(msg);
-}
-
-/**
- * Method to request the decoder to process samples.
- * @param {Object} params Process samples parameters object.
- */
-WhisperDecoder.prototype.processSamples = function(params) {
-  var msg = {
-    type: 'decode_tokens',
-    client_id: this.clientId_,
-    data: params.samples,
-
-    decode_audible: params.decodeAudible,
-    token_length_dtmf: params.audibleTokenParams.length,
-    crc_dtmf: params.audibleTokenParams.crc,
-    parity_dtmf: params.audibleTokenParams.parity,
-
-    decode_inaudible: params.decodeInaudible,
-    token_length_dsss: params.inaudibleTokenParams.length,
-    crc_dsss: params.inaudibleTokenParams.crc,
-    parity_dsss: params.inaudibleTokenParams.parity,
-  };
-
-  this.whisperNacl_.send(msg);
-};
-
-/**
- * Method to handle messages from the whispernet NaCl wrapper.
- * @param {Event} e Event from the whispernet wrapper.
- * @private
- */
-WhisperDecoder.prototype.onNaclMessage_ = function(e) {
-  var msg = e.data;
-  if (msg.type == 'decode_tokens_response' && msg.client_id == this.clientId_) {
-    this.handleCandidates_(msg.tokens, msg.audible);
-  }
-};
-
-/**
- * Method to receive tokens from the decoder and process and forward them to the
- * token callback registered with us.
- * @param {!Array.string} candidates Array of token candidates.
- * @param {boolean} audible Whether the received candidates are from the audible
- *     decoder or not.
- * @private
- */
-WhisperDecoder.prototype.handleCandidates_ = function(candidates, audible) {
-  if (!candidates || candidates.length == 0)
-    return;
-
-  var returnCandidates = [];
-  for (var i = 0; i < candidates.length; ++i) {
-    returnCandidates[i] = { token: bytesToBase64(candidates[i]),
-                            audible: audible };
-  }
-  chrome.copresencePrivate.sendFound(this.clientId_, returnCandidates);
-};