1 files changed, 71 insertions, 0 deletions
diff --git a/assets/javascript/remove-twitter-sw.js b/assets/javascript/remove-twitter-sw.js
new file mode 100644
index 00000000..d9d3ce3e
--- /dev/null
+++ b/assets/javascript/remove-twitter-sw.js
@@ -0,0 +1,71 @@
+'use strict';
+
+const nitterDefault = 'https://nitter.net';
+
+let disableNitter;
+let nitterInstance;
+let redirectBypassFlag;
+let exceptions;
+
+window.browser = window.browser || window.chrome;
+
+function isNotException(url) {
+  return !exceptions.some(regex => (regex.test(url.href)));
+}
+
+function shouldRedirect(url) {
+  return !redirectBypassFlag &&
+    isNotException(url) &&
+    !disableNitter &&
+    url.host !== nitterInstance &&
+    !url.pathname.includes('/home');
+}
+
+function redirectTwitter(url) {
+  if (url.host.split('.')[0] === 'pbs') {
+    return `${nitterInstance}/pic/${encodeURIComponent(url.href)}`;
+  } else if (url.host.split('.')[0] === 'video') {
+    return `${nitterInstance}/gif/${encodeURIComponent(url.href)}`;
+  } else {
+    return `${nitterInstance}${url.pathname}${url.search}`;
+  };
+}
+
+browser.storage.sync.get(
+  [
+    'nitterInstance',
+    'disableNitter',
+    'removeTwitterSW',
+    'redirectBypassFlag',
+    'exceptions'
+  ],
+  (result) => {
+    redirectBypassFlag = result.redirectBypassFlag;
+    browser.storage.sync.set({
+      redirectBypassFlag: false
+    });
+    if (!result.removeTwitterSW) {
+      disableNitter = result.disableNitter;
+      nitterInstance = result.nitterInstance || nitterDefault;
+      exceptions = result.exceptions ? result.exceptions.map(e => {
+        return new RegExp(e);
+      }) : [];
+      navigator.serviceWorker.getRegistrations().then(registrations => {
+        for (let registration of registrations) {
+          if (registration.scope === 'https://twitter.com/') {
+            registration.unregister();
+            console.log('Unregistered Twitter SW', registration);
+          }
+        }
+      });
+      const url = new URL(window.location);
+      if (shouldRedirect()) {
+        const redirect = redirectTwitter(url);
+        console.info(
+          'Redirecting', `"${url.href}"`, '=>', `"${redirect}"`
+        );
+        window.location = redirect;
+      }
+    }
+  }
+);