/// <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.");
}
public OracleInterface(GatewayRequest req, OracleParameterCache opc)
{
_dadName = req.DadName;
_dadConfig = req.DadConfig;
_opc = opc;
string dbUsername = _dadConfig.DatabaseUserName;
string dbPassword = _dadConfig.DatabasePassword;
// Integrated Windows Authentication (use in combination with Oracle proxy authentication)
if (dbUsername == "LOGON_USER")
{
dbUsername = req.WindowsUsername;
// if username contains backslash (domain\user), add double quotes to username
if (dbUsername.IndexOf("\\") > -1)
{
dbUsername = "******"" + dbUsername + "\"";
}
}
if (dbUsername == "LOGON_USER_NO_DOMAIN")
{
dbUsername = req.WindowsUsernameNoDomain;
}
// for connection string attributes, see http://download.oracle.com/docs/html/E15167_01/featConnecting.htm#i1006259
_connStr = "User Id=" + dbUsername + ";Password="******";Data Source=" + _dadConfig.DatabaseConnectString + ";" + _dadConfig.DatabaseConnectStringAttributes;
// careful with this one, it will expose the passwords in the log
// use it just for additional debugging during development
// logger.Debug("Connection string: " + _connStr);
// Connect to Oracle
if (logger.IsDebugEnabled)
{
logger.Debug("Connecting with user " + dbUsername + " to " + _dadConfig.DatabaseConnectString + "...");
}
_conn = new OracleConnection(_connStr);
try
{
_conn.Open();
_connected = true;
if (logger.IsDebugEnabled)
{
logger.Debug("Connected to Oracle " + _conn.ServerVersion);
}
}
catch (OracleException e)
{
_lastError = e.Message;
logger.Error("Failed to connect to database: " + e.Message);
}
if (_connected)
{
_txn = _conn.BeginTransaction();
// setup National Language Support (NLS)
string sql = "alter session set nls_language='" + _dadConfig.NLSLanguage + "' nls_territory='" + _dadConfig.NLSTerritory + "'";
ExecuteSQL(sql, new ArrayList());
//OracleGlobalization glb = OracleGlobalization.GetThreadInfo();
//logger.Debug ("ODP.NET Client Character Set: " + glb.ClientCharacterSet);
// ensure a stateless environment by resetting package state
sql = "begin dbms_session.modify_package_state(dbms_session.reinitialize); end;";
ExecuteSQL(sql, new ArrayList());
if (_dadConfig.InvocationProtocol == DadConfiguration.INVOCATION_PROTOCOL_SOAP)
{
// use SOAP date encoding
sql = "alter session set nls_date_format = '" + _dadConfig.SoapDateFormat + "'";
ExecuteSQL(sql, new ArrayList());
}
}
}