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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Custom binding for the Permissions API. | |
| 6 | |
| 7 var binding = require('binding').Binding.create('permissions'); | |
| 8 | |
| 9 var Event = require('event_bindings').Event; | |
| 10 | |
| 11 // These custom binding are only necessary because it is not currently | |
| 12 // possible to have a union of types as the type of the items in an array. | |
| 13 // Once that is fixed, this entire file should go away. | |
| 14 // See, | |
| 15 // https://code.google.com/p/chromium/issues/detail?id=162044 | |
| 16 // https://code.google.com/p/chromium/issues/detail?id=162042 | |
| 17 // TODO(bryeung): delete this file. | |
| 18 binding.registerCustomHook(function(api) { | |
| 19 var apiFunctions = api.apiFunctions; | |
| 20 var permissions = api.compiledApi; | |
| 21 | |
| 22 function maybeConvertToObject(str) { | |
| 23 var parts = $String.split(str, '|'); | |
| 24 if (parts.length != 2) | |
| 25 return str; | |
| 26 | |
| 27 var ret = {}; | |
| 28 ret[parts[0]] = JSON.parse(parts[1]); | |
| 29 return ret; | |
| 30 } | |
| 31 | |
| 32 function convertObjectPermissionsToStrings() { | |
| 33 if (arguments.length < 1) | |
| 34 return arguments; | |
| 35 | |
| 36 var args = arguments[0].permissions; | |
| 37 if (!args) | |
| 38 return arguments; | |
| 39 | |
| 40 for (var i = 0; i < args.length; i += 1) { | |
| 41 if (typeof(args[i]) == 'object') { | |
| 42 var a = args[i]; | |
| 43 var keys = $Object.keys(a); | |
| 44 if (keys.length != 1) { | |
| 45 throw new Error("Too many keys in object-style permission."); | |
| 46 } | |
| 47 arguments[0].permissions[i] = keys[0] + '|' + | |
| 48 JSON.stringify(a[keys[0]]); | |
| 49 } | |
| 50 } | |
| 51 | |
| 52 return arguments; | |
| 53 } | |
| 54 | |
| 55 // Convert complex permissions to strings so they validate against the schema | |
| 56 apiFunctions.setUpdateArgumentsPreValidate( | |
| 57 'contains', convertObjectPermissionsToStrings); | |
| 58 apiFunctions.setUpdateArgumentsPreValidate( | |
| 59 'remove', convertObjectPermissionsToStrings); | |
| 60 apiFunctions.setUpdateArgumentsPreValidate( | |
| 61 'request', convertObjectPermissionsToStrings); | |
| 62 | |
| 63 // Convert complex permissions back to objects | |
| 64 apiFunctions.setCustomCallback('getAll', | |
| 65 function(name, request, response) { | |
| 66 for (var i = 0; i < response.permissions.length; i += 1) { | |
| 67 response.permissions[i] = | |
| 68 maybeConvertToObject(response.permissions[i]); | |
| 69 } | |
| 70 | |
| 71 // Since the schema says Permissions.permissions contains strings and | |
| 72 // not objects, validation will fail after the for-loop above. This | |
| 73 // skips validation and calls the callback directly, then clears it so | |
| 74 // that handleResponse doesn't call it again. | |
| 75 try { | |
| 76 if (request.callback) | |
| 77 $Function.apply(request.callback, request, [response]); | |
| 78 } finally { | |
| 79 delete request.callback; | |
| 80 } | |
| 81 }); | |
| 82 | |
| 83 // Also convert complex permissions back to objects for events. The | |
| 84 // dispatchToListener call happens after argument validation, which works | |
| 85 // around the problem that Permissions.permissions is supposed to be a list | |
| 86 // of strings. | |
| 87 permissions.onAdded.dispatchToListener = function(callback, args) { | |
| 88 for (var i = 0; i < args[0].permissions.length; i += 1) { | |
| 89 args[0].permissions[i] = maybeConvertToObject(args[0].permissions[i]); | |
| 90 } | |
| 91 $Function.call(Event.prototype.dispatchToListener, this, callback, args); | |
| 92 }; | |
| 93 permissions.onRemoved.dispatchToListener = | |
| 94 permissions.onAdded.dispatchToListener; | |
| 95 }); | |
| 96 | |
| 97 exports.binding = binding.generate(); | |
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