mozilla-central/toolkit/components/extensions/test/mochitest/test_ext_contentscript_canvas.html

Source code

Revision control

Copy as Markdown

Other Tools

Test Info: Warnings

<!doctype html>
<html>
<head>
<title>Test content script access to canvas drawWindow()</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/ExtensionTestUtils.js"></script>
<script src="head.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<script>
"use strict";
add_task(async function test_drawWindow() {
const permissions = [
"<all_urls>",
];
const content_scripts = [{
matches: ["https://example.org/*"],
js: ["content_script.js"],
}];
const files = {
"content_script.js": () => {
const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
try {
ctx.drawWindow(window, 0, 0, 10, 10, "red");
const {data} = ctx.getImageData(0, 0, 10, 10);
browser.test.sendMessage("success", data.slice(0, 3).join());
} catch (e) {
browser.test.sendMessage("error", e.message);
}
},
};
const first = ExtensionTestUtils.loadExtension({
manifest: {
permissions,
content_scripts
},
files
});
const second = ExtensionTestUtils.loadExtension({
manifest: {
content_scripts
},
files
});
consoleMonitor.start([{ message: /Use of drawWindow [\w\s]+ is deprecated. Use tabs.captureTab/ }]);
await first.startup();
await second.startup();
const colour = await first.awaitMessage("success");
is(colour, "255,255,153", "drawWindow() call was successful: #ff9 == rgb(255,255,153)");
const error = await second.awaitMessage("error");
is(error, "ctx.drawWindow is not a function", "drawWindow() method not awailable without permission");
win.close();
await first.unload();
await second.unload();
await consoleMonitor.finished();
});
add_task(async function test_tainted_canvas() {
const permissions = [
"<all_urls>",
];
const content_scripts = [{
matches: ["https://example.org/*"],
js: ["content_script.js"],
}];
const files = {
"content_script.js": () => {
const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
const img = new Image();
img.onload = function() {
ctx.drawImage(img, 0, 0);
try {
const png = canvas.toDataURL();
const {data} = ctx.getImageData(0, 0, 10, 10);
browser.test.sendMessage("success", {png, colour: data.slice(0, 4).join()});
} catch (e) {
browser.test.log(`Exception: ${e.message}`);
browser.test.sendMessage("error", e.message);
}
};
// Cross-origin image from example.com.
},
};
const first = ExtensionTestUtils.loadExtension({
manifest: {
permissions,
content_scripts
},
files
});
const second = ExtensionTestUtils.loadExtension({
manifest: {
content_scripts
},
files
});
await first.startup();
await second.startup();
const {png, colour} = await first.awaitMessage("success");
ok(png.startsWith("data:image/png;base64,"), "toDataURL() call was successful.");
is(colour, "0,0,0,0", "getImageData() returned the correct colour (transparent).");
const error = await second.awaitMessage("error");
is(error, "The operation is insecure.", "toDataURL() throws without permission.");
win.close();
await first.unload();
await second.unload();
});
</script>