public TiResponse process(TiRequestParams data) {
if (!data.ContainsKey("url")) {
throw new Exception("Download Handler Exception: Request missing 'url' param");
}
string url = (string)data["url"];
if (!url.StartsWith("http://") && !url.StartsWith("https://")) {
throw new Exception("Download Handler Exception: 'url' param must start with 'http://' or 'https://'");
}
string saveTo = "";
int p;
if (data.ContainsKey("saveTo")) {
saveTo = (string)data["saveTo"];
} else {
// try to determine the filename based on the URL
p = url.LastIndexOf('/');
if (p > 8 && p != -1) { // make sure the last / is after the ://
saveTo = url.Substring(p + 1);
} else {
throw new Exception("Download Handler Exception: Request missing 'saveTo' param");
}
}
if (saveTo == null || saveTo == "") {
throw new Exception("Download Handler Exception: Invalid 'saveTo' param");
}
saveTo = saveTo.Replace('\\', '/');
IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication();
p = saveTo.LastIndexOf('\\');
if (p != -1) {
string dir = saveTo.Substring(0, p);
try {
if (!isf.DirectoryExists(dir)) {
isf.CreateDirectory(dir);
}
} catch (IsolatedStorageException ise) {
throw new Exception("Download Handler Exception: Unable to create destination directory '" + dir + "' because of insufficient permissions or the isolated storage has been disabled or removed");
}
}
if (isf.FileExists(saveTo)) {
if (data.ContainsKey("overwrite") && (bool)data["overwrite"]) {
isf.DeleteFile(saveTo);
} else {
throw new Exception("Download Handler Exception: File '" + saveTo + "' already exists");
}
}
IsolatedStorageFileStream fileStream = null;
try {
fileStream = isf.CreateFile(saveTo);
} catch (IsolatedStorageException ise) {
throw new Exception("Download Handler Exception: Unable to create file '" + saveTo + "' because the isolated storage has been disabled or removed");
} catch (DirectoryNotFoundException dnfe) {
throw new Exception("Download Handler Exception: Unable to create file '" + saveTo + "' because the directory does not exist");
} catch (ObjectDisposedException dnfe) {
throw new Exception("Download Handler Exception: Unable to create file '" + saveTo + "' because the isolated storage has been disposed");
}
TiResponse response = new TiResponse();
DownloadFile df = new DownloadFile();
response["handle"] = InstanceRegistry.createHandle(df);
df.downloadFileAsync(url, fileStream);
return response;
}