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January 3, 2019 15:47
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/** | |
* Copyright 2015 Google Inc. All rights reserved. | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
* | |
*/ | |
(function() { | |
var nativeAddAll = Cache.prototype.addAll; | |
var userAgent = navigator.userAgent.match(/(Firefox|Chrome)\/(\d+\.)/); | |
// Has nice behavior of `var` which everyone hates | |
if (userAgent) { | |
var agent = userAgent[1]; | |
var version = parseInt(userAgent[2]); | |
} | |
if ( | |
nativeAddAll && (!userAgent || | |
(agent === 'Firefox' && version >= 46) || | |
(agent === 'Chrome' && version >= 50) | |
) | |
) { | |
return; | |
} | |
Cache.prototype.addAll = function addAll(requests) { | |
var cache = this; | |
// Since DOMExceptions are not constructable: | |
function NetworkError(message) { | |
this.name = 'NetworkError'; | |
this.code = 19; | |
this.message = message; | |
} | |
NetworkError.prototype = Object.create(Error.prototype); | |
return Promise.resolve().then(function() { | |
if (arguments.length < 1) throw new TypeError(); | |
// Simulate sequence<(Request or USVString)> binding: | |
var sequence = []; | |
requests = requests.map(function(request) { | |
if (request instanceof Request) { | |
return request; | |
} | |
else { | |
return String(request); // may throw TypeError | |
} | |
}); | |
return Promise.all( | |
requests.map(function(request) { | |
if (typeof request === 'string') { | |
request = new Request(request); | |
} | |
var scheme = new URL(request.url).protocol; | |
if (scheme !== 'http:' && scheme !== 'https:') { | |
throw new NetworkError("Invalid scheme"); | |
} | |
return fetch(request.clone()); | |
}) | |
); | |
}).then(function(responses) { | |
// If some of the responses has not OK-eish status, | |
// then whole operation should reject | |
if (responses.some(function(response) { | |
return !response.ok; | |
})) { | |
throw new NetworkError('Incorrect response status'); | |
} | |
// TODO: check that requests don't overwrite one another | |
// (don't think this is possible to polyfill due to opaque responses) | |
return Promise.all( | |
responses.map(function(response, i) { | |
return cache.put(requests[i], response); | |
}) | |
); | |
}).then(function() { | |
return undefined; | |
}); | |
}; | |
Cache.prototype.add = function add(request) { | |
return this.addAll([request]); | |
}; | |
}()); |
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