Working version

inject.js

@@ -0,0 +1,50 @@
+// Refactored conversion functions
+const hexStrToU8 = hexString => Uint8Array.from(hexString.match(/.{1,2}/g).map(byte => parseInt(byte, 16)));
+
+const u8ToHexStr = bytes => bytes.reduce((str, byte) => str + byte.toString(16).padStart(2, '0'), '');
+
+const b64ToHexStr = b64 => [...atob(b64)].map(c=> c.charCodeAt(0).toString(16).padStart(2,0)).join``
+
+// initData to PSSH
+function getPssh(buffer) {
+    const bytes = hexStrToU8(u8ToHexStr(new Uint8Array(buffer)).match(/000000..70737368.*/)[0]);
+    return window.btoa(String.fromCharCode(...bytes));
+}
+
+// Get Clearkey keys
+function getClearkey(response) {
+    let obj=JSON.parse((new TextDecoder("utf-8")).decode(response))
+    obj = obj["keys"].map(o => [o["kid"], o["k"]]);
+    obj = obj.map(o => o.map(a => a.replace(/-/g, '+').replace(/_/g, '/')+"=="))
+    return obj.map(o => `${b64ToHexStr(o[0])}:${b64ToHexStr(o[1])}`).join("\n")
+
+}
+
+// Widevine PSSH extraction from init
+const originalGenerateRequest = MediaKeySession.prototype.generateRequest;
+MediaKeySession.prototype.generateRequest = function(initDataType, initData) {
+    const result = originalGenerateRequest.call(this, initDataType, initData);
+    //Get PSSH and pass into content.js
+    try {
+        console.log("[PSSH] " + getPssh(initData))
+        document.dispatchEvent(new CustomEvent('pssh', {
+            detail: getPssh(initData)
+        }));
+    } finally {
+        return result;
+    }
+};
+
+//Clearkey Support
+const originalUpdate = MediaKeySession.prototype.update;
+MediaKeySession.prototype.update = function(response) {
+    const result = originalUpdate.call(this, response);
+    try {
+        console.log("[CLEARKEY] " + getClearkey(response));
+        document.dispatchEvent(new CustomEvent('clearkey', {
+            detail: getClearkey(response)
+        }));
+    } finally {
+        return result;
+    }
+};