//---------------------------------------------------------------------------------------
private DataGovParameters SetParameters()
{
const string IdKey = "id";
DataGovParameters Parameters = new DataGovParameters();
Parameters.ApiKey = this.TextBoxApiKey.Text;
Parameters.Filename = this.TextBoxFileName.Value;
Parameters.CkanUrlUpdate = WebConfigSettings.DataGovCkanUpdateUrl;
Parameters.NameValueCollection.Add(IdKey, this.TextBoxResourceId.Text);
return(Parameters);
}
/*---------------------------------------------------------------------------------------
* Configure request as multipart/form-data
* ---------------------------------------------------------------------------------------*/
private static HttpWebRequest ConfigureUploadRequest(DataGovParameters parameters, string boundary)
{
HttpWebRequest PostRequest = (HttpWebRequest)WebRequest.Create(parameters.CkanUrlUpdate);
// Content type is multipart/form-data and includes the boundary information
PostRequest.ContentType = "multipart/form-data; boundary=" + boundary;
PostRequest.Method = "POST";
PostRequest.KeepAlive = true;
PostRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;
// Include Authorization and your API key in the request header
PostRequest.Headers.Add("Authorization", parameters.ApiKey);
PostRequest.Timeout = WebConfigSettings.TimeoutMilliseconds;
return(PostRequest);
}
/*---------------------------------------------------------------------------------------
* Upload a new version of the document as a multipart/form-data
* ---------------------------------------------------------------------------------------*/
private static DataGovOutcome Postfile(DataGovParameters parameters)
{
// Boundary is a unique string used to deliminate form values sent in the request
string Boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
byte[] BoundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + Boundary + "\r\n");
HttpWebRequest PostRequest = null;
Stream PostStream = null;
DataGovOutcome Outcome = new DataGovOutcome();
try {
PostRequest = ConfigureUploadRequest(parameters, Boundary);
PostStream = PostRequest.GetRequestStream();
PostStandardFormHeader(PostStream, BoundaryBytes, parameters);
PostFilenameHeader(PostStream, BoundaryBytes, parameters.Filename);
PostFileContentsData(PostStream, parameters.Filename);
PostTrailerData(PostStream, Boundary);
Outcome.PostStatus = ReadPostResponse(PostRequest);
Outcome.Success = true;
} // The web response may contain more information about the exception
catch (WebException ex) {
if (ex.Response != null)
{
using (Stream ErrorStream = ex.Response.GetResponseStream())
using (StreamReader reader = new StreamReader(ErrorStream)) {
Outcome.PostStatus = reader.ReadToEnd();
Outcome.Success = false;
return(Outcome);
}
}
else
{
throw;
}
}
catch {
throw;
}
finally {
if (PostStream != null)
{
PostStream.Close();
PostRequest = null;
}
}
return(Outcome);
}
//---------------------------------------------------------------------------------------
public static DataGovOutcome UploadToDataGov(DataGovParameters parameters)
{
DataGovOutcome Outcome = null;
try {
Outcome = Postfile(parameters);
if (Outcome.Success)
{
return(ResponseInterpreter.InterpretResponse(Outcome.PostStatus));
}
else
{
return(Outcome);
}
}
catch {
throw;
}
}
/*---------------------------------------------------------------------------------------
* The standard form value is written to the request stream as:
* Encoded boundary comprising 2 dashes, boundary, CRLF
* Content-Disposition: form-data; name=<resource Id>
* 2 CRLFs
* The value of the form field
* 1 CRLF
* ---------------------------------------------------------------------------------------*/
private static void PostStandardFormHeader(Stream postStream, byte[] boundaryBytes, DataGovParameters parameters)
{
string Template = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
foreach (string key in parameters.NameValueCollection.Keys)
{
postStream.Write(boundaryBytes, 0, boundaryBytes.Length);
string FormItem = string.Format(Template, key, parameters.NameValueCollection[key]);
byte[] FormItemBytes = Encoding.UTF8.GetBytes(FormItem);
postStream.Write(FormItemBytes, 0, FormItemBytes.Length);
}
}
