Add User Agent to image download reqs (#1222)

pkg/utils/user_agent.go

@@ -0,0 +1,36 @@
+package utils
+
+import "runtime"
+
+// valid UA from https://user-agents.net
+const Safari = "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15/iY0wnXbs-59"
+const FirefoxWindows = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0"
+const FirefoxLinux = "Mozilla/5.0 (X11; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0"
+const FirefoxLinuxArm = "Mozilla/5.0 (X11; Linux armv7l; rv:86.0) Gecko/20100101 Firefox/86.0"
+const FirefoxLinuxArm64 = "Mozilla/5.0 (X11; Linux aarch64; rv:86.0) Gecko/20100101 Firefox/86.0"
+
+// GetUserAgent returns a valid User Agent string that matches the running os/arch
+func GetUserAgent() string {
+	arch := runtime.GOARCH
+	os := runtime.GOOS
+
+	switch os {
+	case "darwin":
+		return Safari
+	case "windows":
+		return FirefoxWindows
+	case "linux":
+		switch arch {
+		case "arm":
+			return FirefoxLinuxArm
+		case "arm64":
+			return FirefoxLinuxArm64
+		case "amd64":
+			return FirefoxLinux
+		default:
+			return FirefoxLinux
+		}
+	default:
+		return FirefoxLinux
+	}
+}