/// <summary>
/// The main routine that handles each request, calls the database, and outputs the response from the OWA toolkit back to the client through IIS.
/// </summary>
/// <param name="o"></param>
/// <param name="a"></param>
private void HandleRequest(object o, EventArgs a)
{
// grab the request context from ASP.NET
HttpApplication app = (HttpApplication)o;
HttpContext ctx = (HttpContext)app.Context;
if (DadConfiguration.HideServerBanner)
{
// http://blogs.technet.com/b/stefan_gossner/archive/2008/03/12/iis-7-how-to-send-a-custom-server-http-header.aspx
try
{
app.Response.Headers.Remove("Server");
app.Response.Headers.Remove("X-AspNet-Version");
app.Response.Headers.Remove("X-Powered-By");
}
catch (PlatformNotSupportedException e)
{
logger.Warn("Attempted to hide server banners (HideServerBanner = True), but failed with error: " + e.Message);
}
}
// check if gateway should be bypassed (return normal execution to IIS)
if (DadConfiguration.ServeStaticContent)
{
string physicalPath = app.Request.PhysicalPath;
if (File.Exists(physicalPath))
{
logger.Debug("Requested file " + physicalPath + " exists on disk. Gateway will not handle this request.");
return;
}
else
{
logger.Debug("Requested file " + physicalPath + " was NOT found on disk, continuing with normal gateway request.");
}
}
// parse the request (URL); we are expecting calls in a format similar to the following:
// http://servername/PLSQLGatewayModule/dadname/[schema.][package.]procedure?parameter1=xxx¶meter2=yyy
string serverName = app.Request.ServerVariables["HTTP_HOST"];
string requestContentType = app.Request.ContentType;
string requestBody = "";
string requestPath = app.Request.FilePath.Substring(1);
string soapAction = app.Request.Headers["SOAPAction"];
if (requestContentType.ToLower() != "application/x-www-form-urlencoded")
{
requestBody = new StreamReader(app.Request.InputStream, System.Text.Encoding.Default).ReadToEnd();
requestBody = HttpUtility.UrlDecode(requestBody);
}
GatewayRequest gReq = new GatewayRequest(serverName, app.Request.HttpMethod, app.Request.FilePath, app.Request.RawUrl, soapAction);
if (!gReq.DadSpecifiedInRequest)
{
if (DadConfiguration.DefaultDadEnabled)
{
string defaultURL = "/" + gReq.ModuleName + "/" + gReq.DadName + "/" + gReq.ProcName;
logger.Debug("DAD not specified in URL, or specified DAD not defined in configuration file. Redirecting to default DAD and default procedure: " + defaultURL);
ctx.Response.Redirect(defaultURL);
//ctx.Response.StatusCode = 302; // moved temporarily
app.CompleteRequest();
return;
}
else
{
logger.Warn("DAD not specified in request, or DAD not defined in configuration file, and default DAD disabled. Request terminated with 404.");
throw new HttpException(404, "Not Found");
}
}
if (gReq.ValidRequest)
{
// the requested procedure name is valid
// now process querystring and form variables, set up the OWA packages with the CGI environment information,
// and check if there are files to be uploaded
if (gReq.IsWsdlRequest)
{
logger.Debug("Request is for WSDL document");
}
else if (gReq.IsSoapRequest)
{
logger.Debug("Invocation protocol is SOAP");
gReq.AddRequestParametersForSOAP(gReq.ProcName, requestBody);
}
else
{
gReq.AddRequestParameters(app.Request.QueryString, app.Request.Form, app.Request.Files, requestBody);
}
gReq.AddCGIEnvironment(ctx.Request.ServerVariables);
OracleParameterCache opc = new OracleParameterCache(ctx);
// connect to the database
OracleInterface ora = new OracleInterface(gReq, opc);
if (ora.Connected())
{
ora.SetupOwaCGI(gReq.CGIParameters, ctx.Request.UserHostName, ctx.Request.UserHostAddress, gReq.BasicAuthUsername, gReq.BasicAuthPassword);
if (ctx.Request.Files.Count > 0)
{
bool uploadSuccess = ora.UploadFiles(gReq.UploadedFiles);
}
}
bool success = false;
// the GatewayResponse object will hold the result of the database call (headers, cookies, status codes, response body, etc.)
GatewayResponse gResp = new GatewayResponse();
if (!ora.Connected())
{
logger.Debug("Failed to connect to database, skipping procedure execution.");
success = false;
}
else if (gReq.IsSoapRequest)
{
if (gReq.IsWsdlRequest)
{
success = ora.GenerateWsdl(gReq.ServerName, gReq.ModuleName, gReq.DadName, gReq.ProcName);
}
else
{
success = ora.ExecuteMainProc(gReq.OwaProc, gReq.RequestParameters, false, gReq.ProcName);
if (success)
{
ora.GenerateSoapResponse(gReq.ProcName);
}
else
{
int errorCode = ora.GetLastErrorCode();
string errorText = ora.GetLastErrorText();
logger.Debug("SOAP request failed with error code " + errorCode + ", generating SOAP Fault response.");
ora.GenerateSoapFault(errorCode, errorText);
}
}
}
else if (gReq.IsFlexibleParams)
{
logger.Debug("Using flexible parameter mode (converting parameters to name/value arrays)");
success = ora.ExecuteMainProc(gReq.OwaProc, gReq.GetFlexibleParams(), false, gReq.ProcName);
}
else if (gReq.IsPathAlias)
{
logger.Debug("Forwarding request to PathAliasProcedure");
success = ora.ExecuteMainProc(gReq.OwaProc, gReq.GetPathAliasParams(), false, gReq.ProcName);
}
else if (gReq.IsXdbAlias)
{
logger.Debug("Forwarding request to XDB Repository");
success = ora.GetXdbResource(gReq.XdbAliasValue);
}
else if (gReq.IsDocumentPath)
{
logger.Debug("Forwarding request to DocumentProcedure");
success = ora.ExecuteMainProc(gReq.OwaProc, new List <NameValuePair>(), false, gReq.ProcName);
}
else
{
success = ora.ExecuteMainProc(gReq.OwaProc, gReq.RequestParameters, false, gReq.ProcName);
if (!success && ora.GetLastErrorText().IndexOf("PLS-00306:") > -1)
{
logger.Error("Call failed: " + ora.GetLastErrorText());
logger.Debug("Wrong number or types of arguments in call. Will retry call after looking up parameter metadata in data dictionary.");
success = ora.ExecuteMainProc(gReq.OwaProc, gReq.RequestParameters, true, gReq.ProcName);
}
else if (!success && ora.GetLastErrorText().IndexOf("ORA-01460:") > -1)
{
logger.Error("Call failed: " + ora.GetLastErrorText());
logger.Debug("Unimplemented or unreasonable conversion requested. Will retry call after looking up parameter metadata in data dictionary.");
success = ora.ExecuteMainProc(gReq.OwaProc, gReq.RequestParameters, true, gReq.ProcName);
}
else if (!success && ora.GetLastErrorText().IndexOf("ORA-00201:") > -1)
{
logger.Error("Call failed: " + ora.GetLastErrorText());
logger.Debug("Identifier must be declared. Will retry call after looking up parameter metadata in data dictionary.");
success = ora.ExecuteMainProc(gReq.OwaProc, gReq.RequestParameters, true, gReq.ProcName);
}
}
if (success)
{
logger.Info("Gateway procedure executed successfully.");
ora.DoCommit();
if (gReq.IsWsdlRequest)
{
logger.Info("Responding with WSDL document");
gResp.FetchWsdlResponse(ora);
}
else if (gReq.IsSoapRequest)
{
logger.Info("Responding with SOAP response");
gResp.FetchSoapResponse(ora);
}
else if (gReq.IsXdbAlias)
{
logger.Info("Responding with XDB Resource");
gResp.FetchXdbResponse(ora);
}
else
{
// fetch the response buffers from OWA
logger.Debug("Fetch buffer size = " + gReq.DadConfig.FetchBufferSize);
gResp.FetchOwaResponse(ora);
}
ora.CloseConnection();
// process response
ProcessResponse(gReq, gResp, ctx, app);
}
else
{
logger.Error("Call failed: " + ora.GetLastErrorText());
ora.DoRollback();
if (gReq.IsSoapRequest)
{
logger.Debug("SOAP request failed, returning SOAP fault as part of normal response.");
gResp.FetchSoapResponse(ora);
ProcessResponse(gReq, gResp, ctx, app);
}
else if (gReq.DadConfig.ErrorStyle == "DebugStyle")
{
logger.Error("Request failed, showing debug error page");
ctx.Response.Write(GatewayError.GetErrorDebugPage(gReq, ora.GetLastErrorText()));
}
else
{
logger.Error("Request failed, user gets status code 404");
throw new HttpException(404, "Not Found");
//ctx.Response.Clear();
//ctx.Response.StatusCode = 404;
}
// TODO: does this get called if HttpException is thrown above... don't think so!
ora.CloseConnection();
}
}
else
{
logger.Warn("Request (" + requestPath + ") not valid, returning 404...");
if (gReq.DadConfig.ErrorStyle == "DebugStyle")
{
ctx.Response.Write(GatewayError.GetInvalidRequestDebugPage(requestPath, gReq.DadConfig));
}
else
{
throw new HttpException(404, "Not Found");
//ctx.Response.Clear();
//ctx.Response.StatusCode = 404;
}
}
app.CompleteRequest();
logger.Info("Request completed.");
}
private void ProcessResponse(GatewayRequest req, GatewayResponse resp, HttpContext ctx, HttpApplication app)
{
string acceptEncoding = app.Request.Headers["Accept-Encoding"];
acceptEncoding = (acceptEncoding != null ? acceptEncoding.ToLower() : String.Empty);
// check if dynamic content should be compressed
bool doCompress = (DadConfiguration.CompressDynamicContent && !resp.IsDownload && acceptEncoding.Length > 0);
if (doCompress)
{
if (logger.IsDebugEnabled)
{
logger.Debug("Compression of dynamic content is enabled, client accepts " + acceptEncoding);
}
if (acceptEncoding.Contains("gzip") || acceptEncoding == "*")
{
ctx.Response.Filter = new GZipStream(ctx.Response.Filter, CompressionMode.Compress);
ctx.Response.AppendHeader("Content-encoding", "gzip");
ctx.Response.Cache.VaryByHeaders["Accept-encoding"] = true;
}
else if (acceptEncoding.Contains("deflate"))
{
ctx.Response.Filter = new DeflateStream(ctx.Response.Filter, CompressionMode.Compress);
app.Response.AppendHeader("Content-Encoding", "deflate");
ctx.Response.Cache.VaryByHeaders["Accept-encoding"] = true;
}
// note: since compression changes the content-length, the content-length header (if set in database) cannot be used
}
// see http://stackoverflow.com/questions/472906/net-string-to-byte-array-c
int responseBodyLength = System.Text.Encoding.UTF8.GetBytes(resp.ResponseBody.ToString()).Length;
ctx.Response.ContentType = resp.ContentType;
if ((resp.ContentLength != 0) && (!doCompress)) // don't write content-length if response is compressed
{
if ((!resp.IsDownload) && (resp.ContentLength != responseBodyLength))
{
if (logger.IsDebugEnabled)
{
logger.Warn(string.Format("Actual response content length ({0}) is different from Content-Length header ({1}). Content-Length was set via X-DB-Content-Length header (which means the client/gateway character set is different from the database character set).", responseBodyLength, resp.ContentLength));
logger.Debug("To ensure proper page rendering in browser, Content-Length header will be set equal to actual content length");
}
ctx.Response.AddHeader("Content-Length", responseBodyLength.ToString());
}
else
{
ctx.Response.AddHeader("Content-Length", resp.ContentLength.ToString());
}
}
for (int i = 0; i < resp.Cookies.Count; i++)
{
HttpCookie c = resp.Cookies.Get(i);
ctx.Response.Cookies.Add(c);
}
if (resp.RedirectLocation.Length > 0)
{
string newLocation = resp.RedirectLocation;
if (!newLocation.StartsWith("/") && !newLocation.StartsWith("http://") && !newLocation.StartsWith("https://"))
{
logger.Debug("Converting relative path (" + resp.RedirectLocation + ") to absolute path");
newLocation = "/" + req.ModuleName + "/" + req.DadName + "/" + newLocation;
}
logger.Debug("Redirecting to " + newLocation);
//ctx.Response.StatusCode = 302; // moved temporarily
ctx.Response.Redirect(newLocation);
app.CompleteRequest();
return;
}
if (resp.StatusCode != 0)
{
logger.Debug("Setting HTTP status code to " + resp.StatusCode.ToString());
ctx.Response.StatusCode = resp.StatusCode;
//ctx.Response.StatusDescription = gResp.StatusDescription;
// see http://www.evanclosson.com/devlog/bettercustomerrorsinaspnet for more about status codes
}
foreach (NameValuePair nvp in resp.Headers)
{
if (nvp.Name == "Content-length")
{
if ((!resp.IsDownload) && (int.Parse(nvp.Value) != responseBodyLength))
{
logger.Warn(string.Format("Actual response content length ({0}) is different from Content-Length header ({1}).", responseBodyLength, nvp.Value));
}
if (!doCompress) // don't write content-length if response is compressed)
{
ctx.Response.AddHeader(nvp.Name, nvp.Value);
}
}
else
{
ctx.Response.AddHeader(nvp.Name, nvp.Value);
}
}
if (resp.IsDownload)
{
logger.Debug(string.Format("Writing binary response ({0} bytes) to client...", resp.FileData.Length));
if (resp.FileData.Length > 0)
{
ctx.Response.BinaryWrite(resp.FileData);
}
else
{
logger.Warn("Binary response is empty");
}
}
else
{
if (logger.IsDebugEnabled)
{
logger.Debug(string.Format("Writing response ({0} bytes) to client...", responseBodyLength));
//logger.Debug(string.Format("Last 100 characters of response body: {0}", resp.ResponseBody.ToString().Substring(resp.ResponseBody.Length - 100)));
}
ctx.Response.Write(resp.ResponseBody.ToString());
if (resp.ResponseBody.Length == 0)
{
logger.Info("Response body is empty");
}
}
}
