Add a simple method to emulate a platform UA (e.g. pretend a desktop build is an android UA).

components/net/resource_task.rs

@@ -128,7 +128,7 @@ pub fn start_sending_opt(start_chan: LoadConsumer, metadata: Metadata) -> Result
 }
 
 /// Create a ResourceTask
-pub fn new_resource_task(user_agent: Option<String>,
+pub fn new_resource_task(user_agent: String,
                          devtools_chan: Option<Sender<DevtoolsControlMsg>>) -> ResourceTask {
     let hsts_preload = match preload_hsts_domains() {
         Some(list) => list,
@@ -184,7 +184,7 @@ impl ResourceChannelManager {
 }
 
 pub struct ResourceManager {
-    user_agent: Option<String>,
+    user_agent: String,
     cookie_storage: CookieStorage,
     resource_task: IpcSender<ControlMsg>,
     mime_classifier: Arc<MIMEClassifier>,
@@ -193,7 +193,7 @@ pub struct ResourceManager {
 }
 
 impl ResourceManager {
-    pub fn new(user_agent: Option<String>,
+    pub fn new(user_agent: String,
                resource_task: IpcSender<ControlMsg>,
                hsts_list: HSTSList,
                devtools_channel: Option<Sender<DevtoolsControlMsg>>) -> ResourceManager {
@@ -229,9 +229,7 @@ impl ResourceManager {
     }
 
     fn load(&mut self, mut load_data: LoadData, consumer: LoadConsumer) {
-        self.user_agent.as_ref().map(|ua| {
+        load_data.preserved_headers.set(UserAgent(self.user_agent.clone()));
-            load_data.preserved_headers.set(UserAgent(ua.clone()));
-        });
 
         fn from_factory(factory: fn(LoadData, LoadConsumer, Arc<MIMEClassifier>))
                         -> Box<FnBox(LoadData, LoadConsumer, Arc<MIMEClassifier>) + Send> {

components/script/dom/navigatorinfo.rs

@@ -28,10 +28,7 @@ pub fn Platform() -> DOMString {
 }
 
 pub fn UserAgent() -> DOMString {
-    match opts::get().user_agent {
+    opts::get().user_agent.clone()
-        Some(ref user_agent) => user_agent.clone(),
-        None => "".to_owned(),
-    }
 }
 
 pub fn AppVersion() -> DOMString {

components/util/opts.rs

@@ -135,7 +135,7 @@ pub struct Opts {
     pub initial_window_size: TypedSize2D<ScreenPx, u32>,
 
     /// An optional string allowing the user agent to be set for testing.
-    pub user_agent: Option<String>,
+    pub user_agent: String,
 
     /// Whether to run in multiprocess mode.
     pub multiprocess: bool,
@@ -337,17 +337,36 @@ static FORCE_CPU_PAINTING: bool = true;
 #[cfg(not(target_os="android"))]
 static FORCE_CPU_PAINTING: bool = false;
 
+enum UserAgent {
+    Desktop,
+    Android,
+    Gonk,
+}
+
+fn default_user_agent_string(agent: UserAgent) -> String {
+    match agent {
+        UserAgent::Desktop => {
+            "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:37.0) Servo/1.0 Firefox/37.0"
+        }
+        UserAgent::Android => {
+            "Mozilla/5.0 (Android; Mobile; rv:37.0) Servo/1.0 Firefox/37.0"
+        }
+        UserAgent::Gonk => {
+            "Mozilla/5.0 (Mobile; rv:37.0) Servo/1.0 Firefox/37.0"
+        }
+    }.to_owned()
+}
+
 #[cfg(target_os="android")]
-const DEFAULT_USER_AGENT: &'static str = "Mozilla/5.0 (Android; Mobile; rv:37.0) Servo/1.0 Firefox/37.0";
+const DEFAULT_USER_AGENT: UserAgent = UserAgent::Android;
 
 // FIXME: This requires https://github.com/servo/servo/issues/7138 to provide the
 // correct string in Gonk builds (i.e., it will never be chosen today).
 #[cfg(target_os="gonk")]
-const DEFAULT_USER_AGENT: &'static str = "Mozilla/5.0 (Mobile; rv:37.0) Servo/1.0 Firefox/37.0";
+const DEFAULT_USER_AGENT: UserAgent = UserAgent::Gonk;
 
 #[cfg(not(any(target_os="android", target_os="gonk")))]
-const DEFAULT_USER_AGENT: &'static str =
+const DEFAULT_USER_AGENT: UserAgent = UserAgent::Desktop;
-    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:37.0) Servo/1.0 Firefox/37.0";
 
 pub fn default_opts() -> Opts {
     Opts {
@@ -381,7 +400,7 @@ pub fn default_opts() -> Opts {
         devtools_port: None,
         webdriver_port: None,
         initial_window_size: Size2D::typed(800, 600),
-        user_agent: None,
+        user_agent: default_user_agent_string(DEFAULT_USER_AGENT),
         multiprocess: false,
         dump_flow_tree: false,
         dump_display_list: false,
@@ -424,7 +443,10 @@ pub fn from_cmdline_args(args: &[String]) {
     opts.optflagopt("", "devtools", "Start remote devtools server on port", "6000");
     opts.optflagopt("", "webdriver", "Start remote WebDriver server on port", "7000");
     opts.optopt("", "resolution", "Set window resolution.", "800x600");
-    opts.optopt("u", "user-agent", "Set custom user agent string", "NCSA Mosaic/1.0 (X11;SunOS 4.1.4 sun4m)");
+    opts.optopt("u",
+                "user-agent",
+                "Set custom user agent string (or android / gonk / desktop for platform default)",
+                "NCSA Mosaic/1.0 (X11;SunOS 4.1.4 sun4m)");
     opts.optflag("M", "multiprocess", "Run in multiprocess mode");
     opts.optopt("Z", "debug",
                 "A comma-separated string of debug options. Pass help to show available options.", "");
@@ -532,7 +554,13 @@ pub fn from_cmdline_args(args: &[String]) {
         }
     };
 
-    let user_agent = opt_match.opt_str("u").or(Some(DEFAULT_USER_AGENT.to_string()));
+    let user_agent = match opt_match.opt_str("u") {
+        Some(ref ua) if ua == "android" => default_user_agent_string(UserAgent::Android),
+        Some(ref ua) if ua == "gonk" => default_user_agent_string(UserAgent::Gonk),
+        Some(ref ua) if ua == "desktop" => default_user_agent_string(UserAgent::Desktop),
+        Some(ua) => ua,
+        None => default_user_agent_string(DEFAULT_USER_AGENT),
+    };
 
     let user_stylesheets = opt_match.opt_strs("user-stylesheet").iter().map(|filename| {
         let path = cwd.join(filename);

tests/unit/net/hsts.rs

@@ -19,7 +19,7 @@ fn test_add_hsts_entry_to_resource_manager_adds_an_hsts_entry() {
     };
 
     let (tx, _) = ipc::channel().unwrap();
-    let mut manager = ResourceManager::new(None, tx, list, None);
+    let mut manager = ResourceManager::new("".to_owned(), tx, list, None);
 
     let entry = HSTSEntry::new(
         "mozilla.org".to_string(), IncludeSubdomains::NotIncluded, None

tests/unit/net/resource_task.rs

@@ -14,13 +14,13 @@ use url::Url;
 
 #[test]
 fn test_exit() {
-    let resource_task = new_resource_task(None, None);
+    let resource_task = new_resource_task("".to_owned(), None);
     resource_task.send(ControlMsg::Exit).unwrap();
 }
 
 #[test]
 fn test_bad_scheme() {
-    let resource_task = new_resource_task(None, None);
+    let resource_task = new_resource_task("".to_owned(), None);
     let (start_chan, start) = ipc::channel().unwrap();
     let url = Url::parse("bogus://whatever").unwrap();
     resource_task.send(ControlMsg::Load(LoadData::new(url, None), LoadConsumer::Channel(start_chan))).unwrap();