Use newer Chrome User-Agent when accessing GitHub

Follow the examples on:

- https://developer.chrome.com/extensions/webRequest#examples
- https://developer.chrome.com/extensions/samples#search:catblock
- https://stackoverflow.com/questions/10334909/associate-a-custom-user-agent-to-a-specific-google-chrome-page-tab

to change the User-Agent header when accessing GitHub.

2 files changed, 26 insertions, 2 deletions

diff --git a/change-user-agent.js b/change-user-agent.js
new file mode 100644
index 0000000..1aa824a
--- /dev/null
+++ b/change-user-agent.js
@@ -0,0 +1,19 @@
+chrome.webRequest.onBeforeSendHeaders.addListener(
+	function(details) {
+		for (var i = 0; i < details.requestHeaders.length; i++) {
+			if (details.requestHeaders[i].name === 'User-Agent') {
+				// Use newer Chrome user agent for GitHub
+				details.requestHeaders[i].value =
+					'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36';
+
+				break;
+			}
+		}
+
+		return { requestHeaders: details.requestHeaders };
+	},
+	{
+		urls: ['https://github.com/*']
+	},
+	['blocking', 'requestHeaders']
+);
diff --git a/manifest.json b/manifest.json
index b50d7cb..854de84 100644
--- a/manifest.json
+++ b/manifest.json
@@ -7,6 +7,11 @@
 
 	"permissions": [
 		"webRequest",
-		"https://*.github.com/"
-	]
+		"webRequestBlocking",
+		"https://github.com/*"
+	],
+
+	"background": {
+		"scripts": ["change-user-agent.js"]
+	}
 }