Scrub user-agent in contextual identity

scrub.js

@@ -0,0 +1,57 @@
+
+var contextScrub = async function(requestDetails) {
+    console.log("(scrub)Scrubbing info from contextualized request");
+    try {
+        var headerScrub = function(context) {
+            if (!context) {
+                console.error("Context not found");
+            } else {
+                if (context.name = "i2pbrowser") {
+                    var ua = "MYOB/6.66 (AN/ON)";
+                    for (var header of requestDetails.requestHeaders) {
+                        if (header.name.toLowerCase() === "user-agent") {
+                            header.value = ua;
+                            console.log("(scrub)User-Agent header modified", header.value)
+                        }
+                    }
+                    return {
+                        requestHeaders: requestDetails.requestHeaders
+                    };
+                }
+            }
+        }
+        var contextGet = async function(tabInfo){
+            try {
+                console.log("(scrub)Tab info from Function", tabInfo)
+                context = await browser.contextualIdentities.get(tabInfo.cookieStoreId)
+                return context
+            } catch(error) {
+                console.log("(scrub)Conext Error", error)
+            }
+        }
+        var tabGet = async function(tabId) {
+            try {
+                console.log("(scrub)Tab ID from Request", tabId)
+                let tabInfo = await browser.tabs.get(tabId)
+                return tabInfo
+            }catch(error){
+                console.log("(scrub)Tab error", error)
+            }
+        }
+        if (requestDetails.tabId > 0) {
+            var tab = tabGet(requestDetails.tabId)
+            var context = tab.then(contextGet)
+            var req = await context.then(headerScrub)
+            console.log("(scrub)Returning I2P Proxy", req)
+            return req
+        }
+    } catch (error) {
+        console.log("(scrub)Not using I2P Proxy.", error);
+    }
+}
+
+browser.webRequest.onBeforeSendHeaders.addListener(
+    contextScrub,
+    {urls: ["<all_urls>"]},
+    ["blocking", "requestHeaders"]
+);