initial commit

background.js

@@ -0,0 +1,52 @@
+// https://stackoverflow.com/a/45985333
+function getBrowser() {
+	if (typeof chrome !== "undefined") {
+		if (typeof browser !== "undefined") {
+			return "Firefox";
+		} else {
+			return "Chrome";
+		}
+	} else {
+		return "Edge";
+	}
+}
+
+chrome.webRequest.onBeforeRequest.addListener(
+	function (details) {
+		/* Allow our shim to load an untouched copy */
+		if (details.url.endsWith("?no_filter")) {
+			return {};
+		}
+		
+		if (getBrowser() == "Chrome") {
+			return {
+				redirectUrl: chrome.extension.getURL("cadmium-playercore-shim.js")
+			};
+		}
+		
+		/* Work around funky CORS behaviour on Firefox */
+		else if (getBrowser() == "Firefox") {
+			let filter = browser.webRequest.filterResponseData(details.requestId);
+			let encoder = new TextEncoder();
+			filter.onstop = event => {
+				fetch(browser.extension.getURL("cadmium-playercore-shim.js")).
+					then(response => response.text()).
+					then(text => {
+						filter.write(encoder.encode(text));
+						filter.close();
+					});
+			};
+			return {};
+		}
+		
+		else {
+			console.error("Unsupported web browser.");
+			return {};
+		}
+	}, {
+		urls: [
+			"*://assets.nflxext.com/*/ffe/player/html/*",
+			"*://www.assets.nflxext.com/*/ffe/player/html/*"
+		]
+	}, ["blocking"]
+);