define([ 'jquery', '/common/common-util.js', '/common/visible.js', '/common/common-hash.js', '/file/file-crypto.js', '/bower_components/tweetnacl/nacl-fast.min.js', ], function ($, Util, Visible, Hash, FileCrypto) { var Nacl = window.nacl; var Thumb = { dimension: 100, padDimension: 200, UPDATE_INTERVAL: 60000, UPDATE_FIRST: 5000 }; var supportedTypes = [ 'text/plain', 'image/png', 'image/jpeg', 'image/jpg', 'image/gif', 'video/', 'application/pdf' ]; Thumb.isSupportedType = function (file) { if (!file) { return false; } var type = file.type; if (Util.isPlainTextFile(file.type, file.name)) { type = "text/plain"; } return supportedTypes.some(function (t) { return type.indexOf(t) !== -1; }); }; // create thumbnail image from metadata // return an img tag, or undefined if anything goes wrong Thumb.fromMetadata = function (metadata) { if (!metadata || typeof(metadata) !== 'object' || !metadata.thumbnail) { return; } try { var u8 = Nacl.util.decodeBase64(metadata.thumbnail); var blob = new Blob([u8], { type: 'image/png' }); var url = URL.createObjectURL(blob); var img = new Image(); img.src = url; img.width = Thumb.dimension; img.height = Thumb.dimension; return img; } catch (e) { console.error(e); return; } }; var getResizedDimensions = Thumb.getResizedDimensions = function (img, type) { var h = type === 'video' ? img.videoHeight : img.height; var w = type === 'video' ? img.videoWidth : img.width; var dim = type === 'pad' ? Thumb.padDimension : Thumb.dimension; // if the image is too small, don't bother making a thumbnail /*if (h <= dim && w <= dim) { return { x: Math.floor((dim - w) / 2), w: w, y: Math.floor((dim - h) / 2), h : h }; }*/ // the image is taller than it is wide, so scale to that. var r = dim / (h > w? h: w); // ratio if (h <= dim && w <= dim) { r = 1; } var d; if (h > w) { var newW = Math.floor(w*r); d = Math.floor((dim - newW) / 2); return { dim: dim, x: d, w: newW, y: 0, h: dim, }; } else { var newH = Math.floor(h*r); d = Math.floor((dim - newH) / 2); return { dim: dim, x: 0, w: dim, y: d, h: newH }; } }; // assumes that your canvas is square // nodeback returning blob Thumb.fromCanvas = function (canvas, D, cb) { var c2 = document.createElement('canvas'); if (!D) { return void cb('ERROR'); } c2.width = D.dim; c2.height = D.dim; var ctx = c2.getContext('2d'); try { ctx.drawImage(canvas, D.x, D.y, D.w, D.h); } catch (e) { return void cb('ERROR'); } cb(void 0, c2.toDataURL()); }; Thumb.fromImageBlob = function (blob, cb) { var url = URL.createObjectURL(blob); var img = new Image(); img.onload = function () { var D = getResizedDimensions(img, 'image'); Thumb.fromCanvas(img, D, cb); }; img.onerror = function () { cb('ERROR'); }; img.src = url; }; Thumb.fromVideoBlob = function (blob, cb) { var url = URL.createObjectURL(blob); var video = document.createElement("VIDEO"); video.addEventListener('loadeddata', function() { var D = getResizedDimensions(video, 'video'); Thumb.fromCanvas(video, D, cb); }, false); video.addEventListener('error', function (e) { console.error(e); cb('ERROR'); }); video.src = url; }; Thumb.fromPdfBlob = function (blob, cb) { require.config({paths: {'pdfjs-dist': '/common/pdfjs'}}); require(['pdfjs-dist/build/pdf'], function (PDFJS) { var url = URL.createObjectURL(blob); var makeThumb = function (page) { var vp = page.getViewport(1); var canvas = document.createElement("canvas"); canvas.width = canvas.height = Thumb.dimension; var scale = Math.min(canvas.width / vp.width, canvas.height / vp.height); canvas.width = Math.floor(vp.width * scale); canvas.height = Math.floor(vp.height * scale); return page.render({ canvasContext: canvas.getContext("2d"), viewport: page.getViewport(scale) }).promise.then(function () { return canvas; }).catch(function () { cb('ERROR'); }); }; PDFJS.getDocument(url).promise .then(function (doc) { return doc.getPage(1).then(makeThumb).then(function (canvas) { var D = getResizedDimensions(canvas, 'pdf'); Thumb.fromCanvas(canvas, D, cb); }); }).catch(function () { cb('ERROR'); }); }); }; Thumb.fromPlainTextBlob = function (blob, cb) { var canvas = document.createElement("canvas"); canvas.width = canvas.height = Thumb.dimension; var reader = new FileReader(); reader.addEventListener('loadend', function (e) { var content = e.srcElement.result; var lines = content.split("\n"); var canvasContext = canvas.getContext("2d"); var fontSize = 4; canvas.height = (lines.length) * (fontSize + 1); canvasContext.font = fontSize + 'px monospace'; lines.forEach(function (text, i) { canvasContext.fillText(text, 5, i * (fontSize + 1)); }); var D = getResizedDimensions(canvas, "txt"); Thumb.fromCanvas(canvas, D, cb); }); reader.readAsText(blob); }; Thumb.fromBlob = function (blob, _cb) { var cb = Util.once(_cb); if (blob.type.indexOf('video/') !== -1) { return void Thumb.fromVideoBlob(blob, cb); } if (blob.type.indexOf('application/pdf') !== -1) { return void Thumb.fromPdfBlob(blob, cb); } if (Util.isPlainTextFile(blob.type, blob.name)) { return void Thumb.fromPlainTextBlob(blob, cb); } if (blob.type.indexOf('image/') !== -1) { return void Thumb.fromImageBlob(blob, cb); } return void cb('NO_THUMBNAIL'); }; window.html2canvas = undefined; Thumb.fromDOM = function (opts, cb) { var element = opts.getContainer(); if (!element) { return; } var todo = function () { if (opts.filter) { opts.filter(element, true); } window.html2canvas(element, { allowTaint: true, onrendered: function (canvas) { if (opts.filter) { opts.filter(element, false); } setTimeout(function () { var D = getResizedDimensions(canvas, 'pad'); Thumb.fromCanvas(canvas, D, cb); }, 10); } }); }; if (window.html2canvas) { return void todo(); } require(['/bower_components/html2canvas/build/html2canvas.min.js'], todo); }; Thumb.initPadThumbnails = function (common, opts) { if (!opts.type || !opts.getContent) { throw new Error("type and getContent are needed for thumbnails"); } var oldThumbnailState; var mkThumbnail = function () { var content = opts.getContent(); if (content === oldThumbnailState) { return; } oldThumbnailState = content; Thumb.fromDOM(opts, function (err, b64) { Thumb.setPadThumbnail(common, opts.type, null, b64); }); }; var nafa = Util.notAgainForAnother(mkThumbnail, Thumb.UPDATE_INTERVAL); var to; var tUntil; var interval = function () { tUntil = nafa(); if (tUntil) { window.clearTimeout(to); to = window.setTimeout(interval, tUntil+1); return; } to = window.setTimeout(interval, Thumb.UPDATE_INTERVAL+1); }; Visible.onChange(function (v) { if (v) { window.clearTimeout(to); return; } interval(); }); if (!Visible.currently()) { to = window.setTimeout(interval, Thumb.UPDATE_FIRST); } }; var addThumbnail = function (err, thumb, $span, cb) { var split = thumb.split(','); var u8 = Nacl.util.decodeBase64(split[1] || split[0]); var blob = new Blob([u8], { type: 'image/png' }); var url = URL.createObjectURL(blob); var img = new Image(); img.src = url; $span.find('.cp-icon').hide(); $span.prepend(img); cb($(img)); }; Thumb.addThumbnail = function(thumb, $span, cb) { return addThumbnail(null, thumb, $span, cb); }; var getKey = function (type, channel) { return 'thumbnail-' + type + '-' + channel; }; Thumb.setPadThumbnail = function (common, type, channel, b64, cb) { cb = cb || function () {}; channel = channel || common.getMetadataMgr().getPrivateData().channel; var k = getKey(type, channel); common.setThumbnail(k, b64, cb); }; Thumb.displayThumbnail = function (common, href, channel, password, $container, cb) { cb = cb || function () {}; var parsed = Hash.parsePadUrl(href); var k = getKey(parsed.type, channel); var whenNewThumb = function () { var privateData = common.getMetadataMgr().getPrivateData(); var fileHost = privateData.fileHost || privateData.origin; var secret = Hash.getSecrets('file', parsed.hash, password); var hexFileName = secret.channel; var src = fileHost + Hash.getBlobPathFromHex(hexFileName); var key = secret.keys && secret.keys.cryptKey; FileCrypto.fetchDecryptedMetadata(src, key, function (e, metadata) { if (e) { if (e === 'XHR_ERROR') { return; } return console.error(e); } if (!metadata) { return console.error("NO_METADATA"); } var v = metadata.thumbnail; if (!v) { v = 'EMPTY'; } Thumb.setPadThumbnail(common, parsed.type, hexFileName, v, function (err) { if (!metadata.thumbnail) { return; } addThumbnail(err, metadata.thumbnail, $container, cb); }); }); }; common.getThumbnail(k, function (err, v) { if (!v && parsed.type === 'file') { // We can only create thumbnails for files here since we can't easily decrypt pads return void whenNewThumb(); } if (!v) { return; } if (v === 'EMPTY') { return; } addThumbnail(err, v, $container, cb); }); }; return Thumb; });