42 lines
1.5 KiB
JavaScript
42 lines
1.5 KiB
JavaScript
/*
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Copyright 2016 OpenMarket Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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'use struct';
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// Pull in the encryption lib so that we can decrypt attachments.
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var encrypt = require("browser-encrypt-attachment");
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// Pull in a fetch polyfill so we can download encrypted attachments.
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require("isomorphic-fetch");
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// Grab the client so that we can turn mxc:// URLs into https:// URLS.
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var MatrixClientPeg = require('../MatrixClientPeg');
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export function decryptFile(file) {
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var url = MatrixClientPeg.get().mxcUrlToHttp(file.url);
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var self = this;
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// Download the encrypted file as an array buffer.
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return fetch(url).then(function (response) {
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return response.arrayBuffer();
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}).then(function (responseData) {
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// Decrypt the array buffer using the information taken from
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// the event content.
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return encrypt.decryptAttachment(responseData, file);
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}).then(function(dataArray) {
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// Turn the array into a Blob and give it the correct MIME-type.
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var blob = new Blob([dataArray], {type: file.mimetype});
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return blob;
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});
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}
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