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Move decryptFile into a utility function so that it can be shared between different components

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This commit is contained in:
Mark Haines 2016-11-04 12:46:45 +00:00
parent 12fc70c671
commit b6653dd0ed
2 changed files with 50 additions and 27 deletions
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35
src/components/views/messages/MImageBody.js
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@ -19,16 +19,13 @@ limitations under the License.
var React = require('react');
var filesize = require('filesize');
// Pull in the encryption lib so that we can decrypt attachments.
var encrypt = require("browser-encrypt-attachment");
// Pull in a fetch polyfill so we can download encrypted attachments.
require("isomorphic-fetch");
var MatrixClientPeg = require('../../../MatrixClientPeg');
var ImageUtils = require('../../../ImageUtils');
var Modal = require('../../../Modal');
var sdk = require('../../../index');
var dis = require("../../../dispatcher");
var DecryptFile = require('../../../utils/DecryptFile');
module.exports = React.createClass({
@ -116,7 +113,13 @@ module.exports = React.createClass({
var self = this;
if (content.file !== undefined && this.state.decryptedUrl === null) {
// TODO: hook up an error handler to the promise.
this.decryptFile(content.file).catch(function (err) {
DecryptFile.decryptFile(content.file).then(function(blob) {
if (!self._unmounted) {
self.setState({
decryptedUrl: window.URL.createObjectURL(blob),
});
}
}).catch(function (err) {
console.warn("Unable to decrypt attachment: ", err)
// Set a placeholder image when we can't decrypt the image.
self.refs.image.src = "img/warning.svg";
@ -124,28 +127,6 @@ module.exports = React.createClass({
}
},
decryptFile: function(file) {
var url = MatrixClientPeg.get().mxcUrlToHttp(file.url);
var self = this;
// Download the encrypted file as an array buffer.
return fetch(url).then(function (response) {
return response.arrayBuffer();
}).then(function (responseData) {
// Decrypt the array buffer using the information taken from
// the event content.
return encrypt.decryptAttachment(responseData, file);
}).then(function(dataArray) {
// Turn the array into a Blob and use createObjectUrl to make
// a url that we can use as an img src.
var blob = new Blob([dataArray], {type: file.mimetype});
if (!self._unmounted) {
self.setState({
decryptedUrl: window.URL.createObjectURL(blob),
});
}
});
},
componentWillUnmount: function() {
dis.unregister(this.dispatcherRef);
this._unmounted = true;

42
src/utils/DecryptFile.js Normal file
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@ -0,0 +1,42 @@
/*
Copyright 2016 OpenMarket Ltd
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.
*/
'use struct';
// Pull in the encryption lib so that we can decrypt attachments.
var encrypt = require("browser-encrypt-attachment");
// Pull in a fetch polyfill so we can download encrypted attachments.
require("isomorphic-fetch");
// Grab the client so that we can turn mxc:// URLs into https:// URLS.
var MatrixClientPeg = require('../MatrixClientPeg');
export function decryptFile(file) {
var url = MatrixClientPeg.get().mxcUrlToHttp(file.url);
var self = this;
// Download the encrypted file as an array buffer.
return fetch(url).then(function (response) {
return response.arrayBuffer();
}).then(function (responseData) {
// Decrypt the array buffer using the information taken from
// the event content.
return encrypt.decryptAttachment(responseData, file);
}).then(function(dataArray) {
// Turn the array into a Blob and give it the correct MIME-type.
var blob = new Blob([dataArray], {type: file.mimetype});
return blob;
});
}