public async Task<string> GetFile(FileLocation fileLocation) {
logger.debug("Getting file {0}", fileLocation);
if(fileLocation.Constructor == Constructor.fileLocation) {
FileLocationConstructor location = (FileLocationConstructor) fileLocation;
string filePath = FileLocationToCachePath(location);
using(IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication()) {
if(!storage.DirectoryExists("cache")) {
storage.CreateDirectory("cache");
}
if(storage.FileExists(filePath)) {
logger.debug("Getting file {0} from cache", filePath);
return filePath;
}
TLApi api = await session.GetFileSession(location.dc_id);
logger.debug("Got file session for dc {0}", location.dc_id);
Upload_fileConstructor file = (Upload_fileConstructor) await api.upload_getFile(TL.inputFileLocation(location.volume_id, location.local_id, location.secret), 0, int.MaxValue);
logger.debug("File constructor found");
using (Stream fileStream = new IsolatedStorageFileStream(filePath, FileMode.OpenOrCreate,
FileAccess.Write, storage)) {
await fileStream.WriteAsync(file.bytes, 0, file.bytes.Length);
}
logger.debug("File saved successfully");
return filePath;
}
} else {
throw new MTProtoFileUnavailableException();
}
}
public async void downloadFileAsync(string url, IsolatedStorageFileStream filestream) {
SynchronizationContext ctx = SynchronizationContext.Current;
HttpWebRequest request = (HttpWebRequest)WebRequest.CreateHttp(new Uri(url));
request.Method = "GET";
Logger.log("DownloadRequestHandler", "Downloading " + url + " asynchronously...");
request.BeginGetResponse(async callbackResult => {
try {
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(callbackResult);
Logger.log("DownloadRequestHandler", "Status: " + (int)response.StatusCode + " " + response.StatusDescription);
if (response.Headers["Content-Length"] != null) {
Logger.log("DownloadRequestHandler", "Content length: " + response.Headers["Content-Length"]);
} else {
Logger.log("DownloadRequestHandler", "Content length: unknown");
}
Stream responseStream = response.GetResponseStream();
BinaryReader br = new BinaryReader(responseStream);
int responseBufferSize = 4096;
int responseBytesRead = 0;
int responseTotalBytesRead = 0;
byte[] responseBuffer = new byte[responseBufferSize];
while ((responseBytesRead = br.Read(responseBuffer, 0, responseBuffer.Length)) > 0) {
responseTotalBytesRead += responseBytesRead;
await filestream.WriteAsync(responseBuffer, 0, responseBuffer.Length);
}
filestream.Close();
Logger.log("DownloadRequestHandler", "Wrote " + responseTotalBytesRead + " bytes");
DownloadFileEventArgs args = new DownloadFileEventArgs();
args.file = filestream.Name;
args.size = responseTotalBytesRead;
ctx.Post(result => {
DownloadFile df = (DownloadFile)callbackResult.AsyncState;
df.OnComplete((DownloadFileEventArgs)result);
}, args);
} catch (WebException ex) {
// check if we have an expired or self-signed cert
if (ex.Status == WebExceptionStatus.UnknownError) {
if (ex.Response.Headers.Count == 0) {
Logger.log("DownloadRequestHandler", "Invalid SSL certificate, returning a 400 Bad Request");
throw new Exception("Download Handler Exception: Invalid SSL certificate, returning a 400 Bad Request");
} else {
Logger.log("DownloadRequestHandler", "File not found, returning a 404");
throw new Exception("Download Handler Exception: File not found, returning a 404");
}
} else {
Logger.log("DownloadRequestHandler", "400 Bad Request");
Logger.log("DownloadRequestHandler", ex.Status.ToString());
throw;
}
}
}, this);
}