src/common/fs_inet.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        fs_inet.cpp
   3 // Purpose:     HTTP and FTP file system
   4 // Author:      Vaclav Slavik
   5 // Copyright:   (c) 1999 Vaclav Slavik
   6 // Licence:     wxWindows Licence
   7 /////////////////////////////////////////////////////////////////////////////
   8
   9 /*
  10
  11 REMARKS :
  12
  13 This FS creates local cache (in /tmp directory). The cache is freed
  14 on program exit.
  15
  16 Size of cache is limited to cca 1000 items (due to GetTempFileName
  17 limitation)
  18
  19
  20 */
  21
  22 #ifdef __GNUG__
  23 #pragma implementation "fs_inet.h"
  24 #endif
  25
  26 #include "wx/wxprec.h"
  27
  28 #ifdef __BORLANDC__
  29 #pragma hdrstop
  30 #endif
  31
  32 #if !wxUSE_SOCKETS
  33     #undef wxUSE_FS_INET
  34     #define wxUSE_FS_INET 0
  35 #endif
  36
  37 #if wxUSE_FILESYSTEM && wxUSE_FS_INET
  38
  39 #ifndef WXPRECOMP
  40 #endif
  41
  42 #include "wx/wfstream.h"
  43 #include "wx/url.h"
  44 #include "wx/filesys.h"
  45 #include "wx/fs_inet.h"
  46 #include "wx/module.h"
  47
  48 class wxInetCacheNode : public wxObject
  49 {
  50     private:
  51         wxString m_Temp;
  52         wxString m_Mime;
  53
  54     public:
  55         wxInetCacheNode(const wxString& l, const wxString& m) : wxObject() {m_Temp = l; m_Mime = m;}
  56         const wxString& GetTemp() const {return m_Temp;}
  57         const wxString& GetMime() const {return m_Mime;}
  58 };
  59
  60
  61
  62
  63
  64 //--------------------------------------------------------------------------------
  65 // wxInternetFSHandler
  66 //--------------------------------------------------------------------------------
  67
  68
  69 static wxString StripProtocolAnchor(const wxString& location)
  70 {
  71     wxString myloc(location.BeforeLast(wxT('#')));
  72     if (myloc.IsEmpty()) myloc = location.AfterFirst(wxT(':'));
  73     else myloc = myloc.AfterFirst(wxT(':'));
  74
  75     // fix malformed url:
  76     if (myloc.Left(2) != wxT("//"))
  77     {
  78         if (myloc.GetChar(0) != wxT('/')) myloc = wxT("//") + myloc;
  79         else myloc = wxT("/") + myloc;
  80     }
  81     if (myloc.Mid(2).Find(wxT('/')) == wxNOT_FOUND) myloc << wxT('/');
  82
  83     return myloc;
  84 }
  85
  86
  87
  88 bool wxInternetFSHandler::CanOpen(const wxString& location)
  89 {
  90     wxString p = GetProtocol(location);
  91     if ((p == wxT("http")) || (p == wxT("ftp")))
  92     {
  93         wxURL url(p + wxT(":") + StripProtocolAnchor(location));
  94         return (url.GetError() == wxURL_NOERR);
  95     }
  96
  97     return FALSE;
  98 }
  99
 100
 101 wxFSFile* wxInternetFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
 102 {
 103     wxString right = GetProtocol(location) + wxT(":") + StripProtocolAnchor(location);
 104     wxInputStream *s;
 105     wxString content;
 106     wxInetCacheNode *info;
 107
 108     info = (wxInetCacheNode*) m_Cache.Get(right);
 109
 110     // Add item into cache:
 111     if (info == NULL)
 112     {
 113         wxURL url(right);
 114         if (url.GetError() == wxURL_NOERR)
 115         {
 116             s = url.GetInputStream();
 117             content = url.GetProtocol().GetContentType();
 118             if (content == wxEmptyString) content = GetMimeTypeFromExt(location);
 119             if (s)
 120             {
 121                 wxChar buf[256];
 122
 123                 wxGetTempFileName( wxT("wxhtml"), buf);
 124                 info = new wxInetCacheNode(buf, content);
 125                 m_Cache.Put(right, info);
 126
 127                 {   // ok, now copy it:
 128                     wxFileOutputStream sout((wxString)buf);
 129                     s -> Read(sout); // copy the stream
 130                 }
 131                 delete s;
 132             }
 133             else
 134                 return (wxFSFile*) NULL; // we can't open the URL
 135         }
 136         else
 137             return (wxFSFile*) NULL; // incorrect URL
 138     }
 139
 140     // Load item from cache:
 141     s = new wxFileInputStream(info->GetTemp());
 142     if (!s)
 143         return (wxFSFile*) NULL;
 144
 145     return new wxFSFile(s,
 146                         right,
 147                         info->GetMime(),
 148                         GetAnchor(location)
 149 #if wxUSE_DATETIME
 150                         , wxDateTime::Now()
 151 #endif // wxUSE_DATETIME
 152                         );
 153 }
 154
 155
 156
 157 wxInternetFSHandler::~wxInternetFSHandler()
 158 {
 159     wxHashTable::compatibility_iterator n;
 160     wxInetCacheNode *n2;
 161
 162     m_Cache.BeginFind();
 163     while ((n = m_Cache.Next()))
 164     {
 165         n2 = (wxInetCacheNode*) n->GetData();
 166         wxRemoveFile(n2->GetTemp());
 167         delete n2;
 168     }
 169 }
 170
 171 class wxFileSystemInternetModule : public wxModule
 172 {
 173     DECLARE_DYNAMIC_CLASS(wxFileSystemInternetModule)
 174
 175     public:
 176         virtual bool OnInit()
 177         {
 178             wxFileSystem::AddHandler(new wxInternetFSHandler);
 179             return TRUE;
 180         }
 181         virtual void OnExit() {}
 182 };
 183
 184 IMPLEMENT_DYNAMIC_CLASS(wxFileSystemInternetModule, wxModule)
 185
 186 #endif // wxUSE_FILESYSTEM && wxUSE_FS_INET