Implement blob url support in the fetch stack.

components/net/blob_loader.rs

@@ -18,6 +18,7 @@ use resource_thread::{send_error, start_sending_sniffed_opt};
 use resource_thread::CancellationListener;
 use std::boxed::FnBox;
 use std::sync::Arc;
+use url::Url;
 use util::thread::spawn_named;
 
 // TODO: Check on GET
@@ -119,3 +120,72 @@ fn load_blob<UI: 'static + UIProvider>
         send_error(load_data.url.clone(), format_err, start_chan);
     }
 }
+
+/// https://fetch.spec.whatwg.org/#concept-basic-fetch (partial)
+// TODO: make async.
+pub fn load_blob_sync<UI: 'static + UIProvider>
+            (url: Url,
+             filemanager: FileManager<UI>)
+             -> Result<(Headers, Vec<u8>), NetworkError> {
+    let (id, origin) = match parse_blob_url(&url) {
+        Ok((id, origin, _fragment)) => (id, origin),
+        Err(()) => {
+            let e = format!("Invalid blob URL format {:?}", url);
+            return Err(NetworkError::Internal(e));
+        }
+    };
+
+    let (sender, receiver) = ipc::channel().unwrap();
+    let check_url_validity = true;
+    let msg = FileManagerThreadMsg::ReadFile(sender, id, check_url_validity, origin);
+    let _ = filemanager.handle(msg, None);
+
+    let blob_buf = match receiver.recv().unwrap() {
+        Ok(ReadFileProgress::Meta(blob_buf)) => blob_buf,
+        Ok(_) => {
+            return Err(NetworkError::Internal("Invalid filemanager reply".to_string()));
+        }
+        Err(e) => {
+            return Err(NetworkError::Internal(format!("{:?}", e)));
+        }
+    };
+
+    let content_type: Mime = blob_buf.type_string.parse().unwrap_or(mime!(Text / Plain));
+    let charset = content_type.get_param(Attr::Charset);
+
+    let mut headers = Headers::new();
+
+    if let Some(name) = blob_buf.filename {
+        let charset = charset.and_then(|c| c.as_str().parse().ok());
+        headers.set(ContentDisposition {
+            disposition: DispositionType::Inline,
+            parameters: vec![
+                DispositionParam::Filename(charset.unwrap_or(Charset::Us_Ascii),
+                                           None, name.as_bytes().to_vec())
+            ]
+        });
+    }
+
+    // Basic fetch, Step 4.
+    headers.set(ContentLength(blob_buf.size as u64));
+    // Basic fetch, Step 5.
+    headers.set(ContentType(content_type.clone()));
+
+    let mut bytes = blob_buf.bytes;
+    loop {
+        match receiver.recv().unwrap() {
+            Ok(ReadFileProgress::Partial(ref mut new_bytes)) => {
+                bytes.append(new_bytes);
+            }
+            Ok(ReadFileProgress::EOF) => {
+                return Ok((headers, bytes));
+            }
+            Ok(_) => {
+                return Err(NetworkError::Internal("Invalid filemanager reply".to_string()));
+            }
+            Err(e) => {
+                return Err(NetworkError::Internal(format!("{:?}", e)));
+            }
+        }
+    }
+}

components/net/fetch/methods.rs

@@ -2,6 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+use blob_loader::load_blob_sync;
 use connector::create_http_connector;
 use data_loader::decode;
 use devtools_traits::DevtoolsControlMsg;
@@ -464,7 +465,29 @@ fn basic_fetch<UI: 'static + UIProvider>(request: Rc<Request>,
             }
         },
 
-        "blob" | "ftp" => {
+        "blob" => {
+            println!("Loading blob {}", url.as_str());
+            // Step 2.
+            if *request.method.borrow() != Method::Get {
+                return Response::network_error();
+            }
+
+            match load_blob_sync(url.clone(), context.filemanager.clone()) {
+                Ok((headers, bytes)) => {
+                    let mut response = Response::new();
+                    response.url = Some(url.clone());
+                    response.headers = headers;
+                    *response.body.lock().unwrap() = ResponseBody::Done(bytes);
+                    response
+                },
+                Err(e) => {
+                    debug!("Failed to load {}: {:?}", url, e);
+                    Response::network_error()
+                },
+            }
+        },
+
+        "ftp" => {
             // XXXManishearth handle these
             panic!("Unimplemented scheme for Fetch")
         },

tests/unit/net/fetch.rs

@@ -167,6 +167,48 @@ fn test_fetch_data() {
     }
 }
 
+#[test]
+fn test_fetch_blob() {
+    use ipc_channel::ipc;
+    use net_traits::blob_url_store::BlobBuf;
+    use net_traits::filemanager_thread::FileManagerThreadMsg;
+
+    let context = new_fetch_context(None);
+
+    let bytes = b"content";
+    let blob_buf = BlobBuf {
+        filename: Some("test.txt".into()),
+        type_string: "text/plain".into(),
+        size: bytes.len() as u64,
+        bytes: bytes.to_vec(),
+    };
+
+    let origin = Url::parse("http://www.example.org/").unwrap();
+
+    let (sender, receiver) = ipc::channel().unwrap();
+    let message = FileManagerThreadMsg::PromoteMemory(blob_buf, true, sender, "http://www.example.org".into());
+    context.filemanager.handle(message, None);
+    let id = receiver.recv().unwrap().unwrap();
+    let url = Url::parse(&format!("blob:{}{}", origin.as_str(), id.simple())).unwrap();
+
+
+    let request = Request::new(url, Some(Origin::Origin(origin.origin())), false, None);
+    let fetch_response = fetch(Rc::new(request), &mut None, context);
+
+    assert!(!fetch_response.is_network_error());
+
+    assert_eq!(fetch_response.headers.len(), 2);
+
+    let content_type: &ContentType = fetch_response.headers.get().unwrap();
+    assert_eq!(**content_type, Mime(TopLevel::Text, SubLevel::Plain, vec![]));
+
+    let content_length: &ContentLength = fetch_response.headers.get().unwrap();
+    assert_eq!(**content_length, bytes.len() as u64);
+
+    assert_eq!(*fetch_response.body.lock().unwrap(),
+               ResponseBody::Done(bytes.to_vec()));
+}
+
 #[test]
 fn test_fetch_file() {
     let mut path = resources_dir_path().expect("Cannot find resource dir");

tests/wpt/metadata/FileAPI/blob/Blob-XHR-revoke.html.ini

@@ -1,4 +1,6 @@
 [Blob-XHR-revoke.html]
   type: testharness
-  expected: CRASH
   bug: https://github.com/servo/servo/issues/10539
+  [Revoking blob URL used with XMLHttpRequest]
+    expected: FAIL
+

tests/wpt/metadata/fetch/api/basic/scheme-blob-worker.html.ini

@@ -1,3 +1,6 @@
 [scheme-blob-worker.html]
   type: testharness
-  expected: CRASH
+  [Fetching [GET\] URL.createObjectURL(blob) is OK]
+    bug: https://github.com/servo/servo/issues/13766
+    expected: FAIL
+

tests/wpt/metadata/fetch/api/basic/scheme-blob.html.ini

@@ -1,3 +1,6 @@
 [scheme-blob.html]
   type: testharness
-  expected: CRASH
+  [Fetching [GET\] URL.createObjectURL(blob) is OK]
+    bug: https://github.com/servo/servo/issues/13766
+    expected: FAIL
+