Auto merge of #10672 - frewsxcv:net-network, r=KiChjang

Improvements to network preferences, HTTP redirection limiting.

<!-- Reviewable:start -->
This change is [<img src="https://reviewable.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/10672)
<!-- Reviewable:end -->

components/gfx/font_cache_thread.rs

@@ -423,7 +423,7 @@ impl FontCacheThread {
 
 // derived from http://stackoverflow.com/a/10864297/3830
 fn is_supported_font_type(toplevel: &TopLevel, sublevel: &SubLevel) -> bool {
-    if !prefs::get_pref("net.mime.sniff").as_boolean().unwrap_or(false) {
+    if !prefs::get_pref("network.mime.sniff").as_boolean().unwrap_or(false) {
         return true;
     }
 

components/net/http_loader.rs

@@ -44,6 +44,7 @@ use time::Tm;
 #[cfg(any(target_os = "macos", target_os = "linux"))]
 use tinyfiledialogs;
 use url::Url;
+use util::prefs;
 use util::resource_files::resources_dir_path;
 use util::thread::spawn_named;
 use uuid;
@@ -165,7 +166,7 @@ fn load_for_consumer(load_data: LoadData,
         Err(LoadError::Connection(url, e)) => {
             send_error(url, e, start_chan)
         }
-        Err(LoadError::MaxRedirects(url)) => {
+        Err(LoadError::MaxRedirects(url, _)) => {
             send_error(url, "too many redirects".to_owned(), start_chan)
         }
         Err(LoadError::Cors(url, msg)) |
@@ -335,7 +336,7 @@ pub enum LoadError {
     Ssl(Url, String),
     InvalidRedirect(Url, String),
     Decoding(Url, String),
-    MaxRedirects(Url),
+    MaxRedirects(Url, u32),  // u32 indicates number of redirects that occurred
     ConnectionAborted(String),
     Cancelled(Url, String),
 }
@@ -726,10 +727,7 @@ pub fn load<A, B>(load_data: LoadData,
                user_agent: String,
                cancel_listener: &CancellationListener)
                -> Result<StreamedResponse<A::R>, LoadError> where A: HttpRequest + 'static, B: UIProvider {
-    // FIXME: At the time of writing this FIXME, servo didn't have any central
+    let max_redirects = prefs::get_pref("network.http.redirection-limit").as_i64().unwrap() as u32;
-    //        location for configuration. If you're reading this and such a
-    //        repository DOES exist, please update this constant to use it.
-    let max_redirects = 50;
     let mut iters = 0;
     // URL of the document being loaded, as seen by all the higher-level code.
     let mut doc_url = load_data.url.clone();
@@ -761,7 +759,7 @@ pub fn load<A, B>(load_data: LoadData,
         }
 
         if iters > max_redirects {
-            return Err(LoadError::MaxRedirects(doc_url));
+            return Err(LoadError::MaxRedirects(doc_url, iters - 1));
         }
 
         if &*doc_url.scheme != "http" && &*doc_url.scheme != "https" {

components/net/resource_thread.rs

@@ -77,7 +77,7 @@ pub fn start_sending_sniffed_opt(start_chan: LoadConsumer, mut metadata: Metadat
                                  classifier: Arc<MIMEClassifier>, partial_body: &[u8],
                                  context: LoadContext)
                                  -> Result<ProgressSender, ()> {
-    if prefs::get_pref("net.mime.sniff").as_boolean().unwrap_or(false) {
+    if prefs::get_pref("network.mime.sniff").as_boolean().unwrap_or(false) {
         // TODO: should be calculated in the resource loader, from pull requeset #4094
         let mut no_sniff = NoSniffFlag::OFF;
         let mut check_for_apache_bug = ApacheBugFlag::OFF;

resources/prefs.json

@@ -49,7 +49,8 @@
   "layout.text-orientation.enabled": false,
   "layout.viewport.enabled": false,
   "layout.writing-mode.enabled": false,
-  "net.mime.sniff": false,
+  "network.http.redirection-limit": 20,
+  "network.mime.sniff": false,
   "shell.native-titlebar.enabled": true,
   "shell.homepage": "http://servo.org"
 }

tests/unit/net/http_loader.rs

@@ -28,6 +28,7 @@ use std::io::{self, Write, Read, Cursor};
 use std::sync::mpsc::Receiver;
 use std::sync::{Arc, mpsc, RwLock};
 use url::Url;
+use util::prefs;
 
 const DEFAULT_USER_AGENT: &'static str = "Test-agent";
 
@@ -1103,13 +1104,20 @@ fn test_load_errors_when_there_is_too_many_redirects() {
     let http_state = HttpState::new();
     let ui_provider = TestProvider::new();
 
+    let redirect_limit = 13.;
+    prefs::set_pref("network.http.redirection-limit",
+                    prefs::PrefValue::Number(redirect_limit));
+
     match load(load_data, &ui_provider, &http_state, None, &Factory,
                DEFAULT_USER_AGENT.to_owned(), &CancellationListener::new(None)) {
-        Err(LoadError::MaxRedirects(url)) => {
+        Err(LoadError::MaxRedirects(url, num_redirects)) => {
+            assert_eq!(num_redirects, redirect_limit as u32);
             assert_eq!(url.domain().unwrap(), "mozilla.com")
         },
         _ => panic!("expected max redirects to fail")
     }
+
+    prefs::reset_pref("network.http.redirection-limit");
 }
 
 #[test]

tests/unit/util/prefs.rs

@@ -8,7 +8,7 @@ use util::prefs::{PrefValue, extend_prefs, read_prefs_from_file, get_pref, set_p
 fn test_create_pref() {
     let json_str = "{\
   \"layout.writing-mode.enabled\": true,\
-  \"net.mime.sniff\": false,\
+  \"network.mime.sniff\": false,\
   \"shell.homepage\": \"http://servo.org\"\
 }";
 

tests/wpt/mozilla/meta/mozilla/mime_sniffing_font_context.html.ini

@@ -1,3 +1,3 @@
 [mime_sniffing_font_context.html]
   type: testharness
-  prefs: [net.mime.sniff:true]
+  prefs: [network.mime.sniff:true]