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)));
+            }
+        }
+    }
+}