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url.cpp
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2002-11-04
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/////////////////////////////////////////////////////////////////////////////
// Name: url.cpp
// Purpose: URL parser
// Author: Guilhem Lavaux
// Modified by:
// Created: 20/07/1997
// RCS-ID: $Id: url.cpp,v 1.31.2.1 2002/11/03 15:48:13 RR Exp $
// Copyright: (c) 1997, 1998 Guilhem Lavaux
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation "url.h"
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#if wxUSE_URL
#include "wx/string.h"
#include "wx/list.h"
#include "wx/utils.h"
#include "wx/module.h"
#include "wx/url.h"
#include <string.h>
#include <ctype.h>
IMPLEMENT_CLASS(wxProtoInfo, wxObject)
IMPLEMENT_CLASS(wxURL, wxObject)
// Protocols list
wxProtoInfo *wxURL::ms_protocols = NULL;
// Enforce linking of protocol classes:
USE_PROTOCOL(wxFileProto)
#if wxUSE_SOCKETS
USE_PROTOCOL(wxHTTP)
USE_PROTOCOL(wxFTP)
wxHTTP *wxURL::ms_proxyDefault = NULL;
bool wxURL::ms_useDefaultProxy = FALSE;
#endif
// --------------------------------------------------------------
// wxURL
// --------------------------------------------------------------
// --------------------------------------------------------------
// --------- wxURL CONSTRUCTOR DESTRUCTOR -----------------------
// --------------------------------------------------------------
wxURL::wxURL(const wxString& url)
{
m_protocol = NULL;
m_error = wxURL_NOERR;
m_url = url;
#if wxUSE_SOCKETS
if ( ms_useDefaultProxy && !ms_proxyDefault )
{
SetDefaultProxy( wxGetenv(wxT("HTTP_PROXY")) );
if ( !ms_proxyDefault )
{
// don't try again
ms_useDefaultProxy = FALSE;
}
}
m_useProxy = ms_proxyDefault != NULL;
m_proxy = ms_proxyDefault;
#endif // wxUSE_SOCKETS
ParseURL();
}
bool wxURL::ParseURL()
{
wxString last_url = m_url;
// If the URL was already parsed (m_protocol != NULL), pass this section.
if (!m_protocol)
{
// Clean up
CleanData();
// Extract protocol name
if (!PrepProto(last_url))
{
m_error = wxURL_SNTXERR;
return FALSE;
}
// Find and create the protocol object
if (!FetchProtocol())
{
m_error = wxURL_NOPROTO;
return FALSE;
}
// Do we need a host name ?
if (m_protoinfo->m_needhost)
{
// Extract it
if (!PrepHost(last_url))
{
m_error = wxURL_SNTXERR;
return FALSE;
}
}
// Extract full path
if (!PrepPath(last_url))
{
m_error = wxURL_NOPATH;
return FALSE;
}
}
// URL parse finished.
#if wxUSE_SOCKETS
if (m_useProxy)
{
// We destroy the newly created protocol.
CleanData();
// Third, we rebuild the URL.
m_url = m_protoname + wxT(":");
if (m_protoinfo->m_needhost)
m_url = m_url + wxT("//") + m_hostname;
m_url += m_path;
// We initialize specific variables.
m_protocol = m_proxy; // FIXME: we should clone the protocol
}
#endif
m_error = wxURL_NOERR;
return TRUE;
}
void wxURL::CleanData()
{
#if wxUSE_SOCKETS
if (!m_useProxy)
#endif
delete m_protocol;
}
wxURL::~wxURL()
{
CleanData();
#if wxUSE_SOCKETS
if (m_proxy && m_proxy != ms_proxyDefault)
delete m_proxy;
#endif
}
// --------------------------------------------------------------
// --------- wxURL urls decoders --------------------------------
// --------------------------------------------------------------
bool wxURL::PrepProto(wxString& url)
{
int pos;
// Find end
pos = url.Find(wxT(':'));
if (pos == -1)
return FALSE;
m_protoname = url(0, pos);
url = url(pos+1, url.Length());
return TRUE;
}
bool wxURL::PrepHost(wxString& url)
{
wxString temp_url;
int pos, pos2;
if ((url.GetChar(0) != wxT('/')) || (url.GetChar(1) != wxT('/')))
return FALSE;
url = url(2, url.Length());
pos = url.Find(wxT('/'));
if (pos == -1)
pos = url.Length();
if (pos == 0)
return FALSE;
temp_url = url(0, pos);
url = url(url.Find(wxT('/')), url.Length());
// Retrieve service number
pos2 = temp_url.Find(wxT(':'), TRUE);
if (pos2 != -1 && pos2 < pos)
{
m_servname = temp_url(pos2+1, pos);
if (!m_servname.IsNumber())
return FALSE;
temp_url = temp_url(0, pos2);
}
// Retrieve user and password.
pos2 = temp_url.Find(wxT('@'));
// Even if pos2 equals -1, this code is right.
m_hostname = temp_url(pos2+1, temp_url.Length());
m_user = wxT("");
m_password = wxT("");
if (pos2 == -1)
return TRUE;
temp_url = temp_url(0, pos2);
pos2 = temp_url.Find(wxT(':'));
if (pos2 == -1)
return FALSE;
m_user = temp_url(0, pos2);
m_password = temp_url(pos2+1, url.Length());
return TRUE;
}
bool wxURL::PrepPath(wxString& url)
{
if (url.Length() != 0)
m_path = ConvertToValidURI(url);
else
m_path = wxT("/");
return TRUE;
}
bool wxURL::FetchProtocol()
{
wxProtoInfo *info = ms_protocols;
while (info)
{
if (m_protoname == info->m_protoname)
{
if (m_servname.IsNull())
m_servname = info->m_servname;
m_protoinfo = info;
m_protocol = (wxProtocol *)m_protoinfo->m_cinfo->CreateObject();
return TRUE;
}
info = info->next;
}
return FALSE;
}
// --------------------------------------------------------------
// --------- wxURL get ------------------------------------------
// --------------------------------------------------------------
wxInputStream *wxURL::GetInputStream()
{
wxInputStream *the_i_stream = NULL;
if (!m_protocol)
{
m_error = wxURL_NOPROTO;
return NULL;
}
m_error = wxURL_NOERR;
if (m_user != wxT(""))
{
m_protocol->SetUser(m_user);
m_protocol->SetPassword(m_password);
}
#if wxUSE_SOCKETS
wxIPV4address addr;
// m_protoinfo is NULL when we use a proxy
if (!m_useProxy && m_protoinfo->m_needhost)
{
if (!addr.Hostname(m_hostname))
{
m_error = wxURL_NOHOST;
return NULL;
}
addr.Service(m_servname);
if (!m_protocol->Connect(addr, TRUE)) // Watcom needs the 2nd arg for some reason
{
m_error = wxURL_CONNERR;
return NULL;
}
}
#endif
// When we use a proxy, we have to pass the whole URL to it.
if (m_useProxy)
the_i_stream = m_protocol->GetInputStream(m_url);
else
the_i_stream = m_protocol->GetInputStream(m_path);
if (!the_i_stream)
{
m_error = wxURL_PROTOERR;
return NULL;
}
return the_i_stream;
}
#if wxUSE_SOCKETS
void wxURL::SetDefaultProxy(const wxString& url_proxy)
{
if ( !url_proxy )
{
if ( ms_proxyDefault )
{
ms_proxyDefault->Close();
delete ms_proxyDefault;
ms_proxyDefault = NULL;
}
}
else
{
wxString tmp_str = url_proxy;
int pos = tmp_str.Find(wxT(':'));
if (pos == -1)
return;
wxString hostname = tmp_str(0, pos),
port = tmp_str(pos+1, tmp_str.Length()-pos);
wxIPV4address addr;
if (!addr.Hostname(hostname))
return;
if (!addr.Service(port))
return;
if (ms_proxyDefault)
// Finally, when all is right, we connect the new proxy.
ms_proxyDefault->Close();
else
ms_proxyDefault = new wxHTTP();
ms_proxyDefault->Connect(addr, TRUE); // Watcom needs the 2nd arg for some reason
}
}
void wxURL::SetProxy(const wxString& url_proxy)
{
if ( !url_proxy )
{
if ( m_proxy && m_proxy != ms_proxyDefault )
{
m_proxy->Close();
delete m_proxy;
}
m_useProxy = FALSE;
}
else
{
wxString tmp_str;
wxString hostname, port;
int pos;
wxIPV4address addr;
tmp_str = url_proxy;
pos = tmp_str.Find(wxT(':'));
// This is an invalid proxy name.
if (pos == -1)
return;
hostname = tmp_str(0, pos);
port = tmp_str(pos+1, tmp_str.Length()-pos);
addr.Hostname(hostname);
addr.Service(port);
// Finally, create the whole stuff.
if (m_proxy && m_proxy != ms_proxyDefault)
delete m_proxy;
m_proxy = new wxHTTP();
m_proxy->Connect(addr, TRUE); // Watcom needs the 2nd arg for some reason
CleanData();
// Reparse url.
m_useProxy = TRUE;
ParseURL();
}
}
#endif // wxUSE_SOCKETS
wxString wxURL::ConvertToValidURI(const wxString& uri, const wxChar* delims)
{
wxString out_str;
wxString hexa_code;
size_t i;
for (i = 0; i < uri.Len(); i++)
{
wxChar c = uri.GetChar(i);
if (c == wxT(' '))
{
// GRG, Apr/2000: changed to "%20" instead of '+'
out_str += wxT("%20");
}
else
{
// GRG, Apr/2000: modified according to the URI definition (RFC 2396)
//
// - Alphanumeric characters are never escaped
// - Unreserved marks are never escaped
// - Delimiters must be escaped if they appear within a component
// but not if they are used to separate components. Here we have
// no clear way to distinguish between these two cases, so they
// are escaped unless they are passed in the 'delims' parameter
// (allowed delimiters).
static const wxChar marks[] = wxT("-_.!~*()'");
if ( !wxIsalnum(c) && !wxStrchr(marks, c) && !wxStrchr(delims, c) )
{
hexa_code.Printf(wxT("%%%02X"), c);
out_str += hexa_code;
}
else
{
out_str += c;
}
}
}
return out_str;
}
wxString wxURL::ConvertFromURI(const wxString& uri)
{
wxString new_uri;
size_t i = 0;
while (i < uri.Len())
{
int code;
if (uri[i] == wxT('%'))
{
i++;
if (uri[i] >= wxT('A') && uri[i] <= wxT('F'))
code = (uri[i] - wxT('A') + 10) * 16;
else
code = (uri[i] - wxT('0')) * 16;
i++;
if (uri[i] >= wxT('A') && uri[i] <= wxT('F'))
code += (uri[i] - wxT('A')) + 10;
else
code += (uri[i] - wxT('0'));
i++;
new_uri += (wxChar)code;
continue;
}
new_uri += uri[i];
i++;
}
return new_uri;
}
// ----------------------------------------------------------------------
// A module which deletes the default proxy if we created it
// ----------------------------------------------------------------------
#if wxUSE_SOCKETS
class wxURLModule : public wxModule
{
public:
virtual bool OnInit();
virtual void OnExit();
private:
DECLARE_DYNAMIC_CLASS(wxURLModule)
};
IMPLEMENT_DYNAMIC_CLASS(wxURLModule, wxModule)
bool wxURLModule::OnInit()
{
// env var HTTP_PROXY contains the address of the default proxy to use if
// set, but don't try to create this proxy right now because it will slow
// down the program startup (especially if there is no DNS server
// available, in which case it may take up to 1 minute)
if ( getenv("HTTP_PROXY") )
{
wxURL::ms_useDefaultProxy = TRUE;
}
return TRUE;
}
void wxURLModule::OnExit()
{
delete wxURL::ms_proxyDefault;
wxURL::ms_proxyDefault = NULL;
}
#endif // wxUSE_SOCKETS
#endif // wxUSE_URL