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electron.js
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const fs = require('fs')
const fsProm = require('fs/promises');
const os = require('os');
const path = require('path')
const url = require('url')
const {Menu: menu, shell, dialog,
clipboard, nativeImage, ipcMain, app, BrowserWindow} = require('electron')
const crc = require('crc');
const zlib = require('zlib');
const log = require('electron-log')
const program = require('commander')
const {autoUpdater} = require("electron-updater")
const PDFDocument = require('pdf-lib').PDFDocument;
const Store = require('electron-store');
const store = new Store();
const ProgressBar = require('electron-progressbar');
const disableUpdate = require('./disableUpdate').disableUpdate() ||
process.env.DRAWIO_DISABLE_UPDATE === 'true' ||
fs.existsSync('/.flatpak-info'); //This file indicates running in flatpak sandbox
autoUpdater.logger = log
autoUpdater.logger.transports.file.level = 'info'
autoUpdater.autoDownload = false
//Command option to disable hardware acceleration
if (process.argv.indexOf('--disable-acceleration') !== -1)
{
app.disableHardwareAcceleration();
}
const __DEV__ = process.env.DRAWIO_ENV === 'dev'
let windowsRegistry = []
let cmdQPressed = false
let firstWinLoaded = false
let firstWinFilePath = null
let isMac = process.platform === 'darwin'
let enableSpellCheck = store.get('enableSpellCheck');
enableSpellCheck = enableSpellCheck != null? enableSpellCheck : isMac;
//Read config file
var queryObj = {
'dev': __DEV__ ? 1 : 0,
'test': __DEV__ ? 1 : 0,
'gapi': 0,
'db': 0,
'od': 0,
'gh': 0,
'gl': 0,
'tr': 0,
'browser': 0,
'picker': 0,
'mode': 'device',
'export': 'https://convert.diagrams.net/node/export',
'disableUpdate': disableUpdate? 1 : 0,
'winCtrls': isMac? 0 : 1,
'enableSpellCheck': enableSpellCheck? 1 : 0
};
try
{
if (fs.existsSync(process.cwd() + '/urlParams.json'))
{
let urlParams = JSON.parse(fs.readFileSync(process.cwd() + '/urlParams.json'));
for (var param in urlParams)
{
queryObj[param] = urlParams[param];
}
}
}
catch(e)
{
console.log('Error in urlParams.json file: ' + e.message);
}
function createWindow (opt = {})
{
let options = Object.assign(
{
frame: isMac,
backgroundColor: '#FFF',
width: 1600,
height: 1200,
icon: `${__dirname}/images/drawlogo256.png`,
webViewTag: false,
'web-security': true,
webPreferences: {
preload: `${__dirname}/electron-preload.js`,
spellcheck: enableSpellCheck,
contextIsolation: true,
nativeWindowOpen: true
}
}, opt)
let mainWindow = new BrowserWindow(options)
windowsRegistry.push(mainWindow)
if (__DEV__)
{
console.log('createWindow', opt)
}
//Cannot be read before app is ready
queryObj['appLang'] = app.getLocale();
let ourl = url.format(
{
pathname: `${__dirname}/index.html`,
protocol: 'file:',
query: queryObj,
slashes: true
})
mainWindow.loadURL(ourl)
// Open the DevTools.
if (__DEV__)
{
mainWindow.webContents.openDevTools()
}
mainWindow.on('maximize', function()
{
mainWindow.webContents.send('maximize')
});
mainWindow.on('unmaximize', function()
{
mainWindow.webContents.send('unmaximize')
});
mainWindow.on('resize', function()
{
mainWindow.webContents.send('resize')
});
mainWindow.on('close', (event) =>
{
const win = event.sender
const index = windowsRegistry.indexOf(win)
if (__DEV__)
{
console.log('Window on close', index)
}
const contents = win.webContents
if (contents != null)
{
contents.executeJavaScript('if(typeof window.__emt_isModified === \'function\'){window.__emt_isModified()}', true)
.then((isModified) =>
{
if (__DEV__)
{
console.log('__emt_isModified', isModified)
}
if (isModified)
{
var choice = dialog.showMessageBoxSync(
win,
{
type: 'question',
buttons: ['Cancel', 'Discard Changes'],
title: 'Confirm',
message: 'The document has unsaved changes. Do you really want to quit without saving?' //mxResources.get('allChangesLost')
})
if (choice === 1)
{
//If user chose not to save, remove the draft
contents.executeJavaScript('window.__emt_removeDraft()', true);
win.destroy()
}
else
{
cmdQPressed = false
}
}
else
{
win.destroy()
}
})
event.preventDefault()
}
})
// Emitted when the window is closed.
mainWindow.on('closed', (event/*:WindowEvent*/) =>
{
const index = windowsRegistry.indexOf(event.sender)
if (__DEV__)
{
console.log('Window closed idx:%d', index)
}
windowsRegistry.splice(index, 1)
})
return mainWindow
}
// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', e =>
{
ipcMain.on('newfile', (event, arg) =>
{
createWindow(arg)
})
let argv = process.argv
// https://github.com/electron/electron/issues/4690#issuecomment-217435222
if (process.defaultApp != true)
{
argv.unshift(null)
}
var validFormatRegExp = /^(pdf|svg|png|jpeg|jpg|vsdx|xml)$/;
function argsRange(val)
{
return val.split('..').map(Number);
}
try
{
program
.version(app.getVersion())
.usage('[options] [input file/folder]')
.allowUnknownOption() //-h and --help are considered unknown!!
.option('-c, --create', 'creates a new empty file if no file is passed')
.option('-k, --check', 'does not overwrite existing files')
.option('-x, --export', 'export the input file/folder based on the given options')
.option('-r, --recursive', 'for a folder input, recursively convert all files in sub-folders also')
.option('-o, --output <output file/folder>', 'specify the output file/folder. If omitted, the input file name is used for output with the specified format as extension')
.option('-f, --format <format>',
'if output file name extension is specified, this option is ignored (file type is determined from output extension, possible export formats are pdf, png, jpg, svg, vsdx, and xml)',
validFormatRegExp, 'pdf')
.option('-q, --quality <quality>',
'output image quality for JPEG (default: 90)', parseInt)
.option('-t, --transparent',
'set transparent background for PNG')
.option('-e, --embed-diagram',
'includes a copy of the diagram (for PNG, SVG and PDF formats only)')
.option('--embed-svg-images',
'Embed Images in SVG file (for SVG format only)')
.option('-b, --border <border>',
'sets the border width around the diagram (default: 0)', parseInt)
.option('-s, --scale <scale>',
'scales the diagram size', parseFloat)
.option('--width <width>',
'fits the generated image/pdf into the specified width, preserves aspect ratio.', parseInt)
.option('--height <height>',
'fits the generated image/pdf into the specified height, preserves aspect ratio.', parseInt)
.option('--crop',
'crops PDF to diagram size')
.option('-a, --all-pages',
'export all pages (for PDF format only)')
.option('-p, --page-index <pageIndex>',
'selects a specific page, if not specified and the format is an image, the first page is selected', parseInt)
.option('-g, --page-range <from>..<to>',
'selects a page range (for PDF format only)', argsRange)
.option('-u, --uncompressed',
'Uncompressed XML output (for XML format only)')
.parse(argv)
}
catch(e)
{
//On parse error, return [exit and commander will show the error message]
return;
}
var options = program.opts();
//Start export mode?
if (options.export)
{
var dummyWin = new BrowserWindow({
show : false,
webPreferences: {
preload: `${__dirname}/electron-preload.js`,
contextIsolation: true,
nativeWindowOpen: true
}
});
windowsRegistry.push(dummyWin);
try
{
//Prepare arguments and confirm it's valid
var format = null;
var outType = null;
//Format & Output
if (options.output)
{
try
{
var outStat = fs.statSync(options.output);
if (outStat.isDirectory())
{
outType = {isDir: true};
}
else //If we can get file stat, then it exists
{
throw 'Error: Output file already exists';
}
}
catch(e) //on error, file doesn't exist and it is not a dir
{
outType = {isFile: true};
format = path.extname(options.output).substr(1);
if (!validFormatRegExp.test(format))
{
format = null;
}
}
}
if (format == null)
{
format = options.format;
}
var from = null, to = null;
if (options.pageIndex != null && options.pageIndex >= 0)
{
from = options.pageIndex;
}
else if (options.pageRange && options.pageRange.length == 2)
{
from = options.pageRange[0] >= 0 ? options.pageRange[0] : null;
to = options.pageRange[1] >= 0 ? options.pageRange[1] : null;
}
var expArgs = {
format: format,
w: options.width > 0 ? options.width : null,
h: options.height > 0 ? options.height : null,
border: options.border > 0 ? options.border : 0,
bg: options.transparent ? 'none' : '#ffffff',
from: from,
to: to,
allPages: format == 'pdf' && options.allPages,
scale: (options.crop && (options.scale == null || options.scale == 1)) ? 1.00001: (options.scale || 1), //any value other than 1 crops the pdf
embedXml: options.embedDiagram? '1' : '0',
embedImages: options.embedSvgImages? '1' : '0',
jpegQuality: options.quality,
uncompressed: options.uncompressed
};
var paths = program.args;
// If a file is passed
if (paths !== undefined && paths[0] != null)
{
var inStat = null;
try
{
inStat = fs.statSync(paths[0]);
}
catch(e)
{
throw 'Error: input file/directory not found';
}
var files = [];
function addDirectoryFiles(dir, isRecursive)
{
fs.readdirSync(dir).forEach(function(file)
{
var filePath = path.join(dir, file);
stat = fs.statSync(filePath);
if (stat.isFile() && path.basename(filePath).charAt(0) != '.')
{
files.push(filePath);
}
if (stat.isDirectory() && isRecursive)
{
addDirectoryFiles(filePath, isRecursive)
}
});
}
if (inStat.isFile())
{
files.push(paths[0]);
}
else if (inStat.isDirectory())
{
addDirectoryFiles(paths[0], options.recursive);
}
if (files.length > 0)
{
var fileIndex = 0;
function processOneFile()
{
var curFile = files[fileIndex];
try
{
var ext = path.extname(curFile);
expArgs.xml = fs.readFileSync(curFile, ext === '.png' || ext === '.vsdx' ? null : 'utf-8');
if (ext === '.png')
{
expArgs.xml = Buffer.from(expArgs.xml).toString('base64');
startExport();
}
else if (ext === '.vsdx')
{
dummyWin.loadURL(`file://${__dirname}/vsdxImporter.html`);
const contents = dummyWin.webContents;
contents.on('did-finish-load', function()
{
contents.send('import', expArgs.xml);
ipcMain.once('import-success', function(evt, xml)
{
expArgs.xml = xml;
startExport();
});
ipcMain.once('import-error', function()
{
console.error('Error: cannot import VSDX file: ' + curFile);
next();
});
});
}
else
{
startExport();
}
function next()
{
fileIndex++;
if (fileIndex < files.length)
{
processOneFile();
}
else
{
cmdQPressed = true;
dummyWin.destroy();
}
};
function startExport()
{
var mockEvent = {
reply: function(msg, data)
{
try
{
if (data == null || data.length == 0)
{
console.error('Error: Export failed: ' + curFile);
}
else if (msg == 'export-success')
{
var outFileName = null;
if (outType != null)
{
if (outType.isDir)
{
outFileName = path.join(options.output, path.basename(curFile,
path.extname(curFile))) + '.' + format;
}
else
{
outFileName = options.output;
}
}
else if (inStat.isFile())
{
outFileName = path.join(path.dirname(paths[0]), path.basename(paths[0],
path.extname(paths[0]))) + '.' + format;
}
else //dir
{
outFileName = path.join(path.dirname(curFile), path.basename(curFile,
path.extname(curFile))) + '.' + format;
}
try
{
var counter = 0;
var realFileName = outFileName;
if (program.rawArgs.indexOf('-k') > -1 || program.rawArgs.indexOf('--check') > -1)
{
while (fs.existsSync(realFileName))
{
counter++;
realFileName = path.join(path.dirname(outFileName), path.basename(outFileName,
path.extname(outFileName))) + '-' + counter + path.extname(outFileName);
}
}
fs.writeFileSync(realFileName, data, format == 'vsdx'? 'base64' : null, { flag: 'wx' });
console.log(curFile + ' -> ' + realFileName);
}
catch(e)
{
console.error('Error writing to file: ' + outFileName);
}
}
else
{
console.error('Error: ' + data + ': ' + curFile);
}
next();
}
finally
{
mockEvent.finalize();
}
}
};
exportDiagram(mockEvent, expArgs, true);
};
}
catch(e)
{
console.error('Error reading file: ' + curFile);
next();
}
}
processOneFile();
}
else
{
throw 'Error: input file/directory not found or directory is empty';
}
}
else
{
throw 'Error: An input file must be specified';
}
}
catch(e)
{
console.error(e);
cmdQPressed = true;
dummyWin.destroy();
}
return;
}
else if (program.rawArgs.indexOf('-h') > -1 || program.rawArgs.indexOf('--help') > -1 || program.rawArgs.indexOf('-V') > -1 || program.rawArgs.indexOf('--version') > -1) //To prevent execution when help/version arg is used
{
app.quit();
return;
}
//Prevent multiple instances of the application (casuses issues with configuration)
const gotTheLock = app.requestSingleInstanceLock()
if (!gotTheLock)
{
app.quit()
}
else
{
app.on('second-instance', (event, commandLine, workingDirectory) => {
//Create another window
let win = createWindow()
let loadEvtCount = 0;
function loadFinished()
{
loadEvtCount++;
if (loadEvtCount == 2)
{
//Open the file if new app request is from opening a file
var potFile = commandLine.pop();
if (fs.existsSync(potFile))
{
win.webContents.send('args-obj', {args: [potFile]});
}
}
}
//Order of these two events is not guaranteed, so wait for them async.
//TOOD There is still a chance we catch another window 'app-load-finished' if user created multiple windows quickly
ipcMain.once('app-load-finished', loadFinished);
win.webContents.on('did-finish-load', function()
{
win.webContents.zoomFactor = 1;
win.webContents.setVisualZoomLevelLimits(1, 1);
loadFinished();
});
})
}
let win = createWindow()
let loadEvtCount = 0;
function loadFinished()
{
loadEvtCount++;
if (loadEvtCount == 2)
{
//Sending entire program is not allowed in Electron 9 as it is not native JS object
win.webContents.send('args-obj', {args: program.args, create: options.create});
}
}
//Order of these two events is not guaranteed, so wait for them async.
//TOOD There is still a chance we catch another window 'app-load-finished' if user created multiple windows quickly
ipcMain.once('app-load-finished', loadFinished);
win.webContents.on('did-finish-load', function()
{
if (firstWinFilePath != null)
{
if (program.args != null)
{
program.args.push(firstWinFilePath);
}
else
{
program.args = [firstWinFilePath];
}
}
firstWinLoaded = true;
win.webContents.zoomFactor = 1;
win.webContents.setVisualZoomLevelLimits(1, 1);
loadFinished();
});
function toggleSpellCheck()
{
enableSpellCheck = !enableSpellCheck;
store.set('enableSpellCheck', enableSpellCheck);
};
ipcMain.on('toggleSpellCheck', toggleSpellCheck);
let updateNoAvailAdded = false;
function checkForUpdatesFn()
{
autoUpdater.checkForUpdates();
store.set('dontCheckUpdates', false);
if (!updateNoAvailAdded)
{
updateNoAvailAdded = true;
autoUpdater.on('update-not-available', (info) => {
dialog.showMessageBox(
{
type: 'info',
title: 'No updates found',
message: 'You application is up-to-date',
})
})
}
};
let checkForUpdates = {
label: 'Check for updates',
click: checkForUpdatesFn
}
ipcMain.on('checkForUpdates', checkForUpdatesFn);
if (isMac)
{
let template = [{
label: app.name,
submenu: [
{
label: 'About ' + app.name,
click() { shell.openExternal('https://www.diagrams.net'); }
},
{
label: 'Support',
click() { shell.openExternal('https://github.com/jgraph/drawio-desktop/issues'); }
},
checkForUpdates,
{ type: 'separator' },
{ role: 'hide' },
{ role: 'hideothers' },
{ role: 'unhide' },
{ type: 'separator' },
{ role: 'quit' }
]
}, {
label: 'Edit',
submenu: [
{ role: 'undo' },
{ role: 'redo' },
{ type: 'separator' },
{ role: 'cut' },
{ role: 'copy' },
{ role: 'paste' },
{ role: 'pasteAndMatchStyle' },
{ role: 'selectAll' }
]
}]
if (disableUpdate)
{
template[0].submenu.splice(2, 1);
}
const menuBar = menu.buildFromTemplate(template)
menu.setApplicationMenu(menuBar)
}
else //hide menubar in win/linux
{
menu.setApplicationMenu(null)
}
autoUpdater.setFeedURL({
provider: 'github',
repo: 'drawio-desktop',
owner: 'jgraph'
})
if (!disableUpdate && !store.get('dontCheckUpdates'))
{
autoUpdater.checkForUpdates()
}
})
//Quit from the dock context menu should quit the application directly
if (isMac)
{
app.on('before-quit', function() {
cmdQPressed = true;
});
}
// Quit when all windows are closed.
app.on('window-all-closed', function ()
{
if (__DEV__)
{
console.log('window-all-closed', windowsRegistry.length)
}
// On OS X it is common for applications and their menu bar
// to stay active until the user quits explicitly with Cmd + Q
if (cmdQPressed || !isMac)
{
app.quit()
}
})
app.on('activate', function ()
{
if (__DEV__)
{
console.log('app on activate', windowsRegistry.length)
}
// On OS X it's common to re-create a window in the app when the
// dock icon is clicked and there are no other windows open.
if (windowsRegistry.length === 0)
{
createWindow()
}
})
app.on('will-finish-launching', function()
{
app.on("open-file", function(event, path)
{
event.preventDefault();
if (firstWinLoaded)
{
let win = createWindow();
let loadEvtCount = 0;
function loadFinished()
{
loadEvtCount++;
if (loadEvtCount == 2)
{
win.webContents.send('args-obj', {args: [path]});
}
}
//Order of these two events is not guaranteed, so wait for them async.
//TOOD There is still a chance we catch another window 'app-load-finished' if user created multiple windows quickly
ipcMain.once('app-load-finished', loadFinished);
win.webContents.on('did-finish-load', function()
{
win.webContents.zoomFactor = 1;
win.webContents.setVisualZoomLevelLimits(1, 1);
loadFinished();
});
}
else
{
firstWinFilePath = path
}
});
});
autoUpdater.on('error', e => log.error('@error@\n', e))
autoUpdater.on('update-available', (a, b) =>
{
log.info('@update-available@\n', a, b)
dialog.showMessageBox(
{
type: 'question',
buttons: ['Ok', 'Cancel', 'Don\'t Ask Again'],
title: 'Confirm Update',
message: 'Update available.\n\nWould you like to download and install new version?',
detail: 'Application will automatically restart to apply update after download',
}).then( result =>
{
if (result.response === 0)
{
autoUpdater.downloadUpdate()
var progressBar = new ProgressBar({
title: 'draw.io Update',
text: 'Downloading draw.io update...'
});
function reportUpdateError(e)
{
progressBar.detail = 'Error occurred while fetching updates. ' + (e && e.message? e.message : e)
progressBar._window.setClosable(true);
}
autoUpdater.on('error', e => {
if (progressBar._window != null)
{
reportUpdateError(e);
}
else
{
progressBar.on('ready', function() {
reportUpdateError(e);
});
}
})
var firstTimeProg = true;
autoUpdater.on('download-progress', (d) => {
//On mac, download-progress event is not called, so the indeterminate progress will continue until download is finished
log.info('@update-progress@\n', d);
var percent = d.percent;
if (percent)
{
percent = Math.round(percent * 100)/100;
}
if (firstTimeProg)
{
firstTimeProg = false;
progressBar.close();
progressBar = new ProgressBar({
indeterminate: false,
title: 'draw.io Update',
text: 'Downloading draw.io update...',
detail: `${percent}% ...`,
initialValue: percent
});
progressBar
.on('completed', function() {
progressBar.detail = 'Download completed.';
})
.on('aborted', function(value) {
log.info(`progress aborted... ${value}`);
})
.on('progress', function(value) {
progressBar.detail = `${value}% ...`;
})
.on('ready', function() {
//InitialValue doesn't set the UI! so this is needed to render it correctly
progressBar.value = percent;
});
}
else
{
progressBar.value = percent;
}
});
autoUpdater.on('update-downloaded', (info) => {
if (!progressBar.isCompleted())
{
progressBar.close()
}
log.info('@update-downloaded@\n', info)
// Ask user to update the app
dialog.showMessageBox(
{
type: 'question',
buttons: ['Install', 'Later'],
defaultId: 0,
message: 'A new version of ' + app.name + ' has been downloaded',
detail: 'It will be installed the next time you restart the application',
}).then(result =>
{
if (result.response === 0)
{
setTimeout(() => autoUpdater.quitAndInstall(), 1)
}
})
});
}
else if (result.response === 2)
{
//save in settings don't check for updates
log.info('@dont check for updates!@')
store.set('dontCheckUpdates', true)
}
})
})
//Pdf export
const MICRON_TO_PIXEL = 264.58 //264.58 micron = 1 pixel
const PNG_CHUNK_IDAT = 1229209940;
const LARGE_IMAGE_AREA = 30000000;
//NOTE: Key length must not be longer than 79 bytes (not checked)
function writePngWithText(origBuff, key, text, compressed, base64encoded)
{
var isDpi = key == 'dpi';
var inOffset = 0;
var outOffset = 0;
var data = text;
var dataLen = isDpi? 9 : key.length + data.length + 1; //we add 1 zeros with non-compressed data, for pHYs it's 2 of 4-byte-int + 1 byte
//prepare compressed data to get its size
if (compressed)
{
data = zlib.deflateRawSync(encodeURIComponent(text));
dataLen = key.length + data.length + 2; //we add 2 zeros with compressed data
}
var outBuff = Buffer.allocUnsafe(origBuff.length + dataLen + 4); //4 is the header size "zTXt", "tEXt" or "pHYs"
try
{
var magic1 = origBuff.readUInt32BE(inOffset);
inOffset += 4;
var magic2 = origBuff.readUInt32BE(inOffset);
inOffset += 4;
if (magic1 != 0x89504e47 && magic2 != 0x0d0a1a0a)
{
throw new Error("PNGImageDecoder0");
}