Implement file-type functionalities in htmlinputelement and related

Changes include:
- Implement file selection and other DOM behaviours in htmlinputelement
- Integrate IpcSender<FileManagerThreadMsg> into ResourceThreads
- Improve filemanager_thread, including adding type_string field to SelectedFile
- Improve interfaces in FileList/File/Blob to accommodate the above changes

components/net_traits/filemanager_thread.rs

@@ -6,13 +6,22 @@ use ipc_channel::ipc::IpcSender;
 use std::path::PathBuf;
 use uuid::Uuid;
 
+#[derive(Deserialize, Serialize)]
+pub struct SelectedFile {
+    pub id: Uuid,
+    pub filename: PathBuf,
+    pub modified: u64,
+    // https://w3c.github.io/FileAPI/#dfn-type
+    pub type_string: String,
+}
+
 #[derive(Deserialize, Serialize)]
 pub enum FileManagerThreadMsg {
     /// Select a single file, return triple (FileID, FileName, lastModified)
-    SelectFile(IpcSender<FileManagerResult<(Uuid, PathBuf, u64)>>),
+    SelectFile(IpcSender<FileManagerResult<SelectedFile>>),
 
     /// Select multiple files, return a vector of triples
-    SelectFiles(IpcSender<FileManagerResult<Vec<(Uuid, PathBuf, u64)>>>),
+    SelectFiles(IpcSender<FileManagerResult<Vec<SelectedFile>>>),
 
     /// Read file, return the bytes
     ReadFile(IpcSender<FileManagerResult<Vec<u8>>>, Uuid),
@@ -23,7 +32,7 @@ pub enum FileManagerThreadMsg {
 
 pub type FileManagerResult<T> = Result<T, FileManagerThreadError>;
 
-#[derive(Deserialize, Serialize)]
+#[derive(Debug, Deserialize, Serialize)]
 pub enum FileManagerThreadError {
     /// The selection action is invalid, nothing is selected
     InvalidSelection,

components/net_traits/lib.rs

@@ -28,6 +28,7 @@ extern crate util;
 extern crate uuid;
 extern crate websocket;
 
+use filemanager_thread::FileManagerThreadMsg;
 use heapsize::HeapSizeOf;
 use hyper::header::{ContentType, Headers};
 use hyper::http::RawStatus;
@@ -186,8 +187,13 @@ pub type CoreResourceThread = IpcSender<CoreResourceMsg>;
 
 pub type IpcSendResult = Result<(), IOError>;
 
+/// Abstraction of the ability to send a particular type of message,
+/// used by net_traits::ResourceThreads to ease the use its IpcSender sub-fields
+/// XXX: If this trait will be used more in future, some auto derive might be appealing
 pub trait IpcSend<T> where T: serde::Serialize + serde::Deserialize {
+    /// send message T
     fn send(&self, T) -> IpcSendResult;
+    /// get underlying sender
     fn sender(&self) -> IpcSender<T>;
 }
 
@@ -200,13 +206,17 @@ pub trait IpcSend<T> where T: serde::Serialize + serde::Deserialize {
 pub struct ResourceThreads {
     core_thread: CoreResourceThread,
     storage_thread: IpcSender<StorageThreadMsg>,
+    filemanager_thread: IpcSender<FileManagerThreadMsg>,
 }
 
 impl ResourceThreads {
-    pub fn new(c: CoreResourceThread, s: IpcSender<StorageThreadMsg>) -> ResourceThreads {
+    pub fn new(c: CoreResourceThread,
+               s: IpcSender<StorageThreadMsg>,
+               f: IpcSender<FileManagerThreadMsg>) -> ResourceThreads {
         ResourceThreads {
             core_thread: c,
             storage_thread: s,
+            filemanager_thread: f,
         }
     }
 }
@@ -231,6 +241,16 @@ impl IpcSend<StorageThreadMsg> for ResourceThreads {
     }
 }
 
+impl IpcSend<FileManagerThreadMsg> for ResourceThreads {
+    fn send(&self, msg: FileManagerThreadMsg) -> IpcSendResult {
+        self.filemanager_thread.send(msg)
+    }
+
+    fn sender(&self) -> IpcSender<FileManagerThreadMsg> {
+        self.filemanager_thread.clone()
+    }
+}
+
 // Ignore the sub-fields
 impl HeapSizeOf for ResourceThreads {
     fn heap_size_of_children(&self) -> usize { 0 }