Add Abort Network Requests on Escape

Abort Network Requests on Escape.user.js

@@ -0,0 +1,71 @@
+// ==UserScript==
+// @name        Abort Network Requests on Escape
+// @namespace   blankie-scripts
+// @match       http*://*/*
+// @grant       none
+// @version     1.0.0
+// @author      blankie
+// @description Aborts network requests invoked from XMLHttpRequest and fetch() when Escape is pressed
+// @run-at      document-start
+// @inject-into page
+// ==/UserScript==
+
+"use strict";
+
+let activeXHRs = new Set();
+let abortControllers = new Set();
+
+
+unsafeWindow.XMLHttpRequest = new Proxy(unsafeWindow.XMLHttpRequest, {
+    construct: function(target, args) {
+        let xhr = new target(...args);
+        xhr.addEventListener("loadstart", function() {
+            activeXHRs.add(this);
+        }, {passive: true});
+        xhr.addEventListener("loadend", function() {
+            activeXHRs.delete(this);
+        }, {passive: true});
+        return xhr;
+    }
+});
+
+let originalFetch = unsafeWindow.fetch;
+unsafeWindow.fetch = function(resource, options = undefined) {
+    let abortController = new AbortController();
+    options = options || {};
+
+    let originalSignal = options.signal;
+    if (originalSignal) {
+        originalSignal.addEventListener("abort", function() {
+            abortController.abort(originalSignal.reason);
+        }, {passive: true});
+    }
+    options.signal = abortController.signal;
+
+    abortControllers.add(abortController);
+
+    return originalFetch.call(this, resource, options).finally(function() {
+        abortControllers.delete(abortController);
+    });
+}
+
+
+function abortAllRequests() {
+    for (let activeXHR of activeXHRs) {
+        activeXHR.abort();
+    }
+    activeXHRs.clear();
+
+    let error = new DOMException("Network request cancelled by Abort Network Requests on Escape", "NetworkError");
+    for (let abortController of abortControllers) {
+        abortController.abort(error);
+    }
+    abortControllers.clear();
+}
+
+window.addEventListener("keydown", function(event) {
+    if (event.key !== "Escape" || event.target !== document.body || event.altKey || event.ctrlKey || event.metaKey || event.shiftKey) {
+        return;
+    }
+    abortAllRequests();
+}, {passive: true});

README.md

@@ -2,6 +2,11 @@
 
 User scripts I made to deal with some itches
 
+## Abort Network Requests on Escape
+
+A userscript that automatically cancels network requests initiated by
+Javascript when Escape is pressed
+
 ## Anti-Thot
 
 Hacky script to get rid of thot notifications