/**
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* Should not be needed for same domain control (just call via child frame),
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* but an API common for cross-domain and same domain use can be found
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* in embedapi.js with a demo at embedapi.html
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*/
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export default {
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name: 'xdomain-messaging',
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init () {
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const svgEditor = this;
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const svgCanvas = svgEditor.canvas;
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try {
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window.addEventListener('message', function (e) {
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// We accept and post strings for the sake of IE9 support
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if (!e.data || !['string', 'object'].includes(typeof e.data) || e.data.charAt() === '|') {
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return;
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}
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const data = typeof e.data === 'object' ? e.data : JSON.parse(e.data);
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if (!data || typeof data !== 'object' || data.namespace !== 'svgCanvas') {
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return;
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}
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// The default is not to allow any origins, including even the same domain or
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// if run on a `file:///` URL. See `svgedit-config-es.js` for an example of how
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// to configure
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const {allowedOrigins} = svgEditor.curConfig;
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if (!allowedOrigins.includes('*') && !allowedOrigins.includes(e.origin)) {
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console.log(`Origin ${e.origin} not whitelisted for posting to ${window.origin}`);
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return;
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}
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const cbid = data.id;
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const {name, args} = data;
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const message = {
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namespace: 'svg-edit',
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id: cbid
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};
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try {
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// Now that we know the origin is trusted, we perform otherwise
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// unsafe arbitrary canvas method execution
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message.result = svgCanvas[name](...args); // lgtm [js/remote-property-injection]
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} catch (err) {
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message.error = err.message;
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}
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e.source.postMessage(JSON.stringify(message), '*');
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});
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} catch (err) {
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console.log('Error with xdomain message listener: ' + err);
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}
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}
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};
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