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
  24 #endif
  25
  26 #include "wx/wxprec.h"
  27
  28 #ifdef __BORDLANDC__
  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 #include "wx/wx.h"
  41 #endif
  42
  43 #include "wx/wfstream.h"
  44 #include "wx/url.h"
  45 #include "wx/filesys.h"
  46 #include "wx/fs_inet.h"
  47 #include "wx/module.h"
  48
  49 class wxInetCacheNode : public wxObject
  50 {
  51     private:
  52         wxString m_Temp;
  53         wxString m_Mime;
  54
  55     public:
  56         wxInetCacheNode(const wxString& l, const wxString& m) : wxObject() {m_Temp = l; m_Mime = m;}
  57         const wxString& GetTemp() const {return m_Temp;}
  58         const wxString& GetMime() const {return m_Mime;}
  59 };
  60
  61
  62
  63
  64
  65 //--------------------------------------------------------------------------------
  66 // wxInternetFSHandler
  67 //--------------------------------------------------------------------------------
  68
  69
  70 static wxString StripProtocolAnchor(const wxString& location)
  71 {
  72     wxString myloc(location.BeforeLast(wxT('#')));
  73     if (myloc.IsEmpty()) myloc = location.AfterFirst(wxT(':'));
  74     else myloc = myloc.AfterFirst(wxT(':'));
  75
  76     // fix malformed url:
  77     if (myloc.Left(2) != wxT("//"))
  78     {
  79         if (myloc.GetChar(0) != wxT('/')) myloc = wxT("//") + myloc;
  80         else myloc = wxT("/") + myloc;
  81     }
  82     if (myloc.Mid(2).Find(wxT('/')) == wxNOT_FOUND) myloc << wxT('/');
  83
  84     return myloc;
  85 }
  86
  87
  88
  89 bool wxInternetFSHandler::CanOpen(const wxString& location)
  90 {
  91     wxString p = GetProtocol(location);
  92     if ((p == wxT("http")) || (p == wxT("ftp")))
  93     {
  94         wxURL url(p + wxT(":") + StripProtocolAnchor(location));
  95         return (url.GetError() == wxURL_NOERR);
  96     }
  97     else
  98         return FALSE;
  99 }
 100
 101
 102 wxFSFile* wxInternetFSHandler::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
 103 {
 104     wxString right = GetProtocol(location) + wxT(":") + StripProtocolAnchor(location);
 105     wxInputStream *s;
 106     wxString content;
 107     wxInetCacheNode *info;
 108
 109     info = (wxInetCacheNode*) m_Cache.Get(right);
 110
 111     // Add item into cache:
 112     if (info == NULL)
 113     {
 114         wxURL url(right);
 115         if (url.GetError() == wxURL_NOERR)
 116         {
 117             s = url.GetInputStream();
 118             content = url.GetProtocol().GetContentType();
 119             if (content == wxEmptyString) content = GetMimeTypeFromExt(location);
 120             if (s)
 121             {
 122                 wxChar buf[256];
 123
 124                 wxGetTempFileName( wxT("wxhtml"), buf);
 125                 info = new wxInetCacheNode(buf, content);
 126                 m_Cache.Put(right, info);
 127
 128                 {   // ok, now copy it:
 129                     wxFileOutputStream sout((wxString)buf);
 130                     s -> Read(sout); // copy the stream
 131                 }
 132                 delete s;
 133             }
 134             else
 135                 return (wxFSFile*) NULL; // we can't open the URL
 136         }
 137         else
 138             return (wxFSFile*) NULL; // incorrect URL
 139     }
 140
 141     // Load item from cache:
 142     s = new wxFileInputStream(info->GetTemp());
 143     if (s)
 144     {
 145         return new wxFSFile(s,
 146                             right,
 147                             info->GetMime(),
 148                             GetAnchor(location),
 149                             wxDateTime::Now());
 150     }
 151     else return (wxFSFile*) NULL;
 152 }
 153
 154
 155
 156 wxInternetFSHandler::~wxInternetFSHandler()
 157 {
 158     wxNode *n;
 159     wxInetCacheNode *n2;
 160
 161     m_Cache.BeginFind();
 162     while ((n = m_Cache.Next()) != NULL)
 163     {
 164         n2 = (wxInetCacheNode*) n->GetData();
 165         wxRemoveFile(n2->GetTemp());
 166         delete n2;
 167     }
 168 }
 169
 170 class wxFileSystemInternetModule : public wxModule
 171 {
 172     DECLARE_DYNAMIC_CLASS(wxFileSystemInternetModule)
 173
 174     public:
 175         virtual bool OnInit()
 176         {
 177             wxFileSystem::AddHandler(new wxInternetFSHandler);
 178             return TRUE;
 179         }
 180         virtual void OnExit() {}
 181 };
 182
 183 IMPLEMENT_DYNAMIC_CLASS(wxFileSystemInternetModule, wxModule)
 184
 185 #endif // wxUSE_FILESYSTEM && wxUSE_FS_INET