element-web/src/components/views/messages/MVideoBody.js

/*
Copyright 2015, 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 strict';

var React = require('react');
var filesize = require('filesize');


var MatrixClientPeg = require('../../../MatrixClientPeg');
var Modal = require('../../../Modal');
var sdk = require('../../../index');
var DecryptFile = require("../../../utils/DecryptFile")

module.exports = React.createClass({
    displayName: 'MVideoBody',

    getInitialState: function() {
        return {
            decryptedUrl: null,
            decryptedThumbnailUrl: null,
        };
    },

    thumbScale: function(fullWidth, fullHeight, thumbWidth, thumbHeight) {
        if (!fullWidth || !fullHeight) {
            // Cannot calculate thumbnail height for image: missing w/h in metadata. We can't even
            // log this because it's spammy
            return undefined;
        }
        if (fullWidth < thumbWidth && fullHeight < thumbHeight) {
            // no scaling needs to be applied
            return 1;
        }
        var widthMulti = thumbWidth / fullWidth;
        var heightMulti = thumbHeight / fullHeight;
        if (widthMulti < heightMulti) {
            // width is the dominant dimension so scaling will be fixed on that
            return widthMulti;
        }
        else {
            // height is the dominant dimension so scaling will be fixed on that
            return heightMulti;
        }
    },

    _getContentUrl: function() {
        var content = this.props.mxEvent.getContent();
        if (content.file !== undefined) {
            return this.state.decryptedUrl;
        } else {
            return MatrixClientPeg.get().mxcUrlToHttp(content.url);
        }
    },

    _getThumbUrl: function() {
        var content = this.props.mxEvent.getContent();
        if (content.file !== undefined) {
            return this.state.decryptedThumbnailUrl;
        } else if (content.info.thumbnail_url) {
            return MatrixClientPeg.get().mxcUrlToHttp(content.info.thumbnail_url);
        } else {
            return null;
        }
    },

    componentDidMount: function() {
        var content = this.props.mxEvent.getContent();
        var self = this;

        if (content.file !== undefined && this.state.decryptedUrl === null) {
            var thumbnailPromise = Promise.resolve(null);
            if (content.info.thumbnail_file) {
                thumbnailPromise = DecryptFile.decryptFile(
                    content.info.thumbnail_file
                );
            }
            thumbnailPromise.then(function(thumbnailBlob) {
                DecryptFile.decryptFile(
                    content.file
                ).then(function(contentBlob) {
                    if (self._unmounted) {
                        return;
                    }
                    var contentUrl = window.URL.createObjectURL(contentBlob);
                    var thumbUrl = null;
                    if (thumbnailBlob) {
                        thumbUrl = window.URL.createObjectURL(thumbnailBlob);
                    }
                    self.setState({
                        decryptedUrl: contentUrl,
                        decryptedThumbnailUrl: thumbUrl,
                    });
                });
            }).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";
            });
        }
    },

    componentWillUnmount: function() {
        this._unmounted = true;
        if (this.state.decryptedUrl) {
            window.URL.revokeObjectURL(this.state.decryptedUrl);
        }
        if (this.state.decryptedThumbnailUrl) {
            window.URL.revokeObjectURL(this.state.decryptedThumbnailUrl);
        }
    },


    render: function() {
        var content = this.props.mxEvent.getContent();

        if (content.file !== undefined && this.state.decryptedUrl === null) {
            // Need to decrypt the attachment
            // The attachment is decrypted in componentDidMount.
            // For now add an img tag with a spinner.
            return (
                <span className="mx_MImageBody" ref="body">
                <img className="mx_MImageBody_thumbnail" src="img/spinner.gif" ref="image"
                    alt={content.body} />
                </span>
            );
        }

        var contentUrl = this._getContentUrl();
        var thumbUrl = this._getThumbUrl();

        var height = null;
        var width = null;
        var poster = null;
        var preload = "metadata";
        if (content.info) {
            var scale = this.thumbScale(content.info.w, content.info.h, 480, 360);
            if (scale) {
                width = Math.floor(content.info.w * scale);
                height = Math.floor(content.info.h * scale);
            }

            if (thumbUrl) {
                poster = thumbUrl;
                preload = "none";
            }
        }

        var download;
        if (this.props.tileShape === "file_grid") {
            download = (
                <div className="mx_MImageBody_download">
                    <a className="mx_MImageBody_downloadLink" href={contentUrl} target="_blank" rel="noopener">
                        {content.body}
                    </a>
                    <div className="mx_MImageBody_size">
                        { content.info && content.info.size ? filesize(content.info.size) : "" }
                    </div>
                </div>
            );
        }
        else {
            var TintableSvg = sdk.getComponent("elements.TintableSvg");
            download = (
                <div className="mx_MImageBody_download">
                    <a href={contentUrl} target="_blank" rel="noopener">
                        <TintableSvg src="img/download.svg" width="12" height="14"/>
                        Download {content.body} ({ content.info && content.info.size ? filesize(content.info.size) : "Unknown size" })
                    </a>
                </div>
            );
        }

        return (
            <span className="mx_MVideoBody">
                <video className="mx_MVideoBody" src={contentUrl} alt={content.body}
                    controls preload={preload} autoPlay={false}
                    height={height} width={width} poster={poster}>
                </video>
                { download }
            </span>
        );
    },
});