element-web/electron_app/src/webcontents-handler.js

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const {clipboard, nativeImage, Menu, MenuItem, shell} = require('electron');
const url = require('url');
const PERMITTED_URL_SCHEMES = [
'http:',
'https:',
'mailto:',
];
function safeOpenURL(target) {
// openExternal passes the target to open/start/xdg-open,
// so put fairly stringent limits on what can be opened
// (for instance, open /bin/sh does indeed open a terminal
// with a shell, albeit with no arguments)
const parsedUrl = url.parse(target);
if (PERMITTED_URL_SCHEMES.indexOf(parsedUrl.protocol) > -1) {
// explicitly use the URL re-assembled by the url library,
// so we know the url parser has understood all the parts
// of the input string
const newTarget = url.format(parsedUrl);
shell.openExternal(newTarget);
}
}
function onWindowOrNavigate(ev, target) {
// always prevent the default: if something goes wrong,
// we don't want to end up opening it in the electron
// app, as we could end up opening any sort of random
// url in a window that has node scripting access.
ev.preventDefault();
safeOpenURL(target);
}
function onLinkContextMenu(ev, params) {
const url = params.linkURL || params.srcURL;
const popupMenu = new Menu();
popupMenu.append(new MenuItem({
label: url,
click() {
safeOpenURL(url);
},
}));
if (params.mediaType && params.mediaType === 'image' && !url.startsWith('file://')) {
popupMenu.append(new MenuItem({
label: 'Copy Image',
click() {
if (url.startsWith('data:')) {
clipboard.writeImage(nativeImage.createFromDataURL(url));
} else {
ev.sender.copyImageAt(params.x, params.y);
}
},
}));
}
popupMenu.append(new MenuItem({
label: 'Copy Link Address',
click() {
clipboard.writeText(url);
},
}));
popupMenu.popup();
ev.preventDefault();
}
function _CutCopyPasteSelectContextMenus(params) {
return [{
role: 'cut',
enabled: params.editFlags.canCut,
}, {
role: 'copy',
enabled: params.editFlags.canCopy,
}, {
role: 'paste',
enabled: params.editFlags.canPaste,
}, {
role: 'pasteandmatchstyle',
enabled: params.editFlags.canPaste,
}, {
role: 'selectall',
enabled: params.editFlags.canSelectAll,
}];
}
function onSelectedContextMenu(ev, params) {
const items = _CutCopyPasteSelectContextMenus(params);
const popupMenu = Menu.buildFromTemplate(items);
popupMenu.popup();
ev.preventDefault();
}
function onEditableContextMenu(ev, params) {
const items = [
{ role: 'undo' },
{ role: 'redo', enabled: params.editFlags.canRedo },
{ type: 'separator' },
].concat(_CutCopyPasteSelectContextMenus(params));
const popupMenu = Menu.buildFromTemplate(items);
popupMenu.popup();
ev.preventDefault();
}
module.exports = (webContents) => {
webContents.on('new-window', onWindowOrNavigate);
webContents.on('will-navigate', onWindowOrNavigate);
webContents.on('context-menu', function(ev, params) {
if (params.linkURL || params.srcURL) {
onLinkContextMenu(ev, params);
} else if (params.selectionText) {
onSelectedContextMenu(ev, params);
} else if (params.isEditable) {
onEditableContextMenu(ev, params);
}
});
};