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Orphaned content script case self-destruction for install.js

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This commit is contained in:
tophf 2017-03-19 04:58:16 +03:00
parent 66a1c17847
commit db560f3ede
1 changed files with 37 additions and 5 deletions
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42
install.js
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@ -69,7 +69,9 @@ function sendEvent(type, data) {
document.dispatchEvent(stylishEvent);
}
document.addEventListener("stylishInstallChrome", function() {
document.addEventListener("stylishUpdateChrome", stylishUpdateChrome);
function stylishInstallChrome() {
orphanCheck();
getResource(getMeta("stylish-description"), function(name) {
if (confirm(chrome.i18n.getMessage('styleInstall', [name]))) {
getResource(getMeta("stylish-code-chrome"), function(code) {
@ -83,9 +85,11 @@ document.addEventListener("stylishInstallChrome", function() {
getResource(getMeta("stylish-install-ping-url-chrome"));
}
});
}, false);
}
document.addEventListener("stylishUpdateChrome", function() {
document.addEventListener("stylishInstallChrome", stylishInstallChrome);
function stylishUpdateChrome() {
orphanCheck();
chrome.runtime.sendMessage({method: "getStyles", url: getMeta("stylish-id-url") || location.href}, function(response) {
var style = response[0];
if (confirm(chrome.i18n.getMessage('styleUpdate', [style.name]))) {
@ -99,8 +103,7 @@ document.addEventListener("stylishUpdateChrome", function() {
});
}
});
}, false);
}
function getMeta(name) {
var e = document.querySelector("link[rel='" + name + "']");
@ -146,3 +149,32 @@ function getResource(url, callback) {
...document.querySelectorAll('div[id^="stylish-installed-style-not-installed-"]'),
...document.querySelectorAll('div[id^="stylish-installed-style-needs-update-"]')
]);
// orphaned content script check
chrome.runtime.onMessage.addListener((msg, sender, sendResponse) =>
msg.method == 'ping' && sendResponse(true));
function orphanCheck() {
var port = chrome.runtime.connect();
if (port) {
port.disconnect();
return;
}
// we're orphaned due to an extension update
// we can detach event listeners
document.removeEventListener('stylishUpdateChrome', stylishUpdateChrome);
document.removeEventListener('stylishInstallChrome', stylishInstallChrome);
// we can't detach chrome.runtime.onMessage because it's no longer connected internally
// we can destroy global functions in this context to free up memory
[
'arraysAreEqual',
'getMeta',
'getResource',
'orphanCheck',
'sectionsAreEqual',
'sendEvent',
'stylishUpdateChrome',
'stylishInstallChrome'
].forEach(fn => window[fn] = null);
}