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#include <module.h> 
inherit "module"; 
inherit "roxenlib"; 
 
#define WATCH(b,a) (perror( sprintf( b + ":%O\n", (a) ) ), (a)) 
 
/************** Generic module stuff ***************/ 
 
array register_module() 
{ 
  return ({ /*MODULE_DIRECTORIES |*/ MODULE_URL,  
            "Language module", 
            "Handles documents in different languages. " 
            "<br>Is also a directory module with nifty flags " 
            "if the file exists in more than one langauge.", 
            ({ }),  
            1 
         }); 
} 
 
void create() 
{ 
  defvar( "default_language", "en", "Default language", TYPE_STRING, 
         "The default language for this server. Is used when trying to " 
         "decide which language to send when the user hasn't selected any. " 
         "Also the language for the files with no language-extension." ); 
 
  defvar( "languages", "en    English\nde     Deutch          en\nsv  Svenska         en", 
         "Languages", TYPE_TEXT_FIELD, 
         "The languages supported by this site. One language on each row. " 
         "Syntax: " 
         "<br>language-code language-name optional-next-language-codes" 
         "<br>For example:\n" 
         "<pre>sv     Svenska         en de\n" 
         "en  English         de\n" 
         "de  Deutch          en\n" 
         "</pre>" 
         "<p>The next-language-code is used to determine what language should " 
         "be used in case the choosen language is unavailable. To find a " 
         "page with a suitable language the languages is tried as follows. " 
         "<ol><li>The selected language, stored as a prestate" 
         "<li>The user's agent's accept-headers" 
         "<li>The selected languages next-languages-codes if any" 
         "<li>The default language" 
         "<li>If there were no selected language, the default language's " 
         "next-language-codes" 
         "<li>All languages, in the order they appear in this text-field" 
         "</ol>" 
         "<p>Empty lines, lines beginning with # or // will be ignored. Lines " 
         "with errors may be ignored, or execute a HCF instruction." ); 
 
  defvar( "flag_dir", "/icons", "Flag directory", TYPE_STRING, 
         "A directory with small pictures of flags, or other symbols, " 
         "representing the various languages. Each flag should exist in the " 
         "following versions:" 
         "<dl><dt>language-code.selected.gif" 
         "<dd>Shown to indicate that the page is in that selected language, " 
         "usually by the header-module." 
         "<dt>language-code.available.gif" 
         "<dd>Shown as a link to the page in that language. Will of course " 
         "only be used if the page exists in that language." 
         "<dt>language-code.unavailable.gif" 
         "<dd>Shown to indicate that the user has selected an language that " 
         "this page hasn't been translated to." 
/*     "<dt>language-code.dir.selected.gif" 
         "<dd>Shown to indicate that the dir-entry will be shown in that " 
         "language." 
         "<dt>language-code.dir.avalable.gif" 
         "<dd>Shown as a link to the dir-entry translated to that language." 
*/     "</dl>" 
         "<p>It is of course not necessary to have all this pictures if " 
         "their use is not enabled in this module nor the header module." ); 
 
/*  defvar( "flags_or_text", 1, "Flags in directory lists", TYPE_FLAG, 
         "If set, the directory lists will include cute flags to indicate " 
         "which language the entries exists in. Otherwise it will be shown " 
         "with not-so-cure text. " ); 
 
  defvar( "readme", 1, "Include readme files", TYPE_FLAG, 
         "If set, include readme files in directory listings"); 
 
 
  defvar("directories", 1, "Directory parsing", TYPE_FLAG,  
         "If you set this flag to on, a directories will be "+ 
         "parsed to a file-list, if no index file is present. "+ 
         "If not, a 'No such file or directory' response will be generated."); 
 
  defvar("indexoverride", 1, "Directory indexfile override enabled", TYPE_FLAG, 
         "If set, requests ending with /. will always return a listing of "+ 
         "the contents of the directory, even if there is an indexfile "+ 
         "present."); 
 
  defvar("no_tilde", 1, "Exclude backupfiles from directorylistings",  
         TYPE_FLAG, 
         "If set, all files ending with '~' or '#' or '.bak' will "+ 
         "be excluded from directory listings, since they are considered "+ 
         "backups."); 
 
  defvar("indexfiles", ({ "index.html", "Main.html", "welcome.html",  
                          "Welcome.html" }),  
         "Directory index files",  
         TYPE_STRING_LIST, 
         "If any of these files are present in a directory, they will be "+ 
         "returned instead of the actual directory."); 
*/ 
} 
 
/*  Module specific stuff */ 
 
 
#define TYPE_MP  "    Module location" 
#define TYPE_DIR "    Directory" 
 
 
inline string image(string f)  
{  
  return ("<img border=0 src="+(f)+" alt=>");  
} 
 
inline string link(string a, string b)  
{  
  return ("<a href="+replace(b, ({ "//", "#" }), ({ "/", "%23" })) 
          +">"+a+"</a>");  
} 
 
string find_readme(string path, mapping id) 
{ 
  string rm, f; 
  object n; 
  foreach(({ "README.html", "README" }), f) 
  { 
    rm=roxen->try_get_file(path+f, id); 
    if(rm) if(f[-1] == 'l') 
      return "<hr noshade>"+rm; 
    else 
      return "<pre><hr noshade>"+ 
        replace(rm, ({"<",">","&"}), ({"&lt;","&gt;","&amp;"}))+"</pre>"; 
  } 
  return ""; 
} 
 
string head(string path,mapping id) 
{ 
  string rm=""; 
 
  if(QUERY(readme))  
    rm=find_readme(path,id); 
   
  return ("<h1>Directory listing of "+path+"</h1>\n<p>"+rm 
          +"<pre>\n<hr noshade>"); 
} 
 
string describe_dir_entry( string path, string filename, array stat ) 
{ 
  string type, icon; 
  int len; 
   
  if (!stat) 
    return ""; 
 
  switch (len=stat[1]) 
  { 
   case -3: 
    type = TYPE_MP; 
    icon = "internal-gopher-menu"; 
    filename += "/"; 
    break; 
       
   case -2: 
    type = TYPE_DIR; 
    filename += "/"; 
    icon = "internal-gopher-menu"; 
    break; 
       
   default: 
    array tmp; 
    tmp = roxen->type_from_filename(filename, 1); 
    if(!tmp) 
      tmp = ({ "Unknown", 0 }); 
    type = tmp[0]; 
    icon = image_from_type( type ); 
    if(tmp[1])  type += " " + tmp[1]; 
  } 
   
  return sprintf("%s %s %8s %-20s\n",        
                 link(image(icon), http_encode_string(path + filename)), 
                 link(sprintf("%-35s", filename[0..34]),  
                      http_encode_string(path + filename)), 
                 sizetostring(len), type); 
} 
 
string key; 
 
string new_dir(string path, mapping id) 
{ 
  int i; 
  array files; 
  string fname; 
 
  files = roxen->find_dir(path, id); 
  if(!files) return "<h1>There is no such directory.</h1>"; 
  files = sort_array(files); 
 
  for(i=0; i<sizeof(files) ; i++) 
  { 
    fname = replace(path+files[i], "//", "/"); 
    files[i] = describe_dir_entry(path,files[i],roxen->stat_file(fname, id)); 
  } 
  return files * ""; 
} 
 
mapping parse_directory( mapping id ) 
{ 
  string f; 
  string dir; 
 
  f = id->not_query; 
 
  if (id->pragma[ "no-cache" ] || !(dir = cache_lookup( key, f ))) 
    cache_set( key, f, dir=new_dir( f, id )); 
  return http_string_answer( head( f, id ) + dir); 
} 
 
// language part 
 
mapping (string:mixed) language_data = ([ ]); 
array (string) language_order = ({ }); 
#define LANGUAGE_DATA_NAME 0 
#define LANGUAGE_DATA_NEXT_LANGUAGE 1 
multiset (string) language_list; 
string default_language, flag_dir; 
 
 
mixed fnord(mixed what) { return what; } 
 
void start() 
{ 
  string tmp; 
  array (string) tmpl; 
 
  key = "file:" + roxen->current_configuration->name; 
 
  foreach (query( "languages" ) / "\n", tmp) 
    if (strlen( tmp ) > 2 && tmp[0] != '#' && tmp[0..1] != "//") 
    { 
      tmp = replace( tmp, "\t", " " ); 
      tmpl = tmp / " " - ({ "" }); 
      if (sizeof( tmpl ) >= 2) 
      { 
        language_data[ tmpl[0] ] = ({ tmpl[1], tmpl[2..17000] }); 
        language_order += ({ tmpl[0] }); 
      } 
    } 
  language_list = aggregate_multiset( @indices( language_data ) ); 
  foreach (indices( language_data ), tmp) 
    language_data[ tmp ][ LANGUAGE_DATA_NEXT_LANGUAGE ] &= indices( language_list ); 
  default_language = query( "default_language" ); 
  flag_dir = query( "flag_dir" ); 
} 
 
multiset (string) find_files( string url, object id ) 
{ 
  string filename, basename, extension; 
  multiset (string) files = (< >); 
  multiset result = (< >); 
  array tmp; 
 
  filename = reverse( (reverse( url ) / "/")[0] ); 
  basename = reverse( (reverse( url ) / "/")[1..17000] * "/" ) + "/"; 
  tmp = roxen->find_dir( basename, id ); 
  if (tmp) 
    files = aggregate_multiset( @tmp ); 
  foreach (indices( language_list ), extension) 
    if (files[ filename + "." + extension ]) 
      result[ extension ] = 1; 
  if (files[ filename ]) 
    result[ "" ] = 1; 
  return result; 
} 
 
mixed remap_url( object id, string url ) 
{ 
  string choosen_language, prestate_language, extension; 
  string found_language; 
  multiset (string) lang_tmp, found_languages, found_languages_orig; 
  array (string) accept_language; 
 
  if(id->misc->language) 
    return 0; 
 
  extension = reverse( (reverse( url ) / ".")[0] ); 
  if (language_list[ extension ]) 
  { 
    string redirect_url; 
 
    redirect_url = reverse( (reverse( url ) / ".")[1..17000] * "." ); 
    if (id->query) 
      redirect_url += "?" + id->query; 
    redirect_url = add_pre_state( redirect_url, (id->prestate - language_list) + (< extension >) ); 
    WATCH( 1, redirect_url ); 
     
    return http_redirect( redirect_url, id ); 
  }              
  found_languages_orig = find_files( url, id ); 
  found_languages = copy_value( found_languages_orig ); 
  if (sizeof( found_languages_orig ) == 0) 
    return 0; 
  if (found_languages_orig[ "" ]) 
  { 
    found_languages[ "" ] = 0; 
    found_languages[ default_language ] = 1; 
  } 
  // The file with no language extension is supposed to be in the default 
  // language 
 
  // fill the accept_language list 
  accept_language = ({ }); 
  accept_language &= indices( language_list ); 
   
  lang_tmp = language_list & id->prestate; 
  if (sizeof( lang_tmp )) 
    choosen_language = prestate_language = indices( lang_tmp )[0]; 
  else if (sizeof( accept_language )) 
    choosen_language = accept_language[0]; 
  else 
    choosen_language = default_language; 
 
  if (found_languages[ choosen_language ]) 
    found_language = choosen_language; 
  else if (sizeof( accept_language & indices( found_languages ) )) 
    found_language = choosen_language 
      = (accept_language & indices( found_languages ))[0]; 
  else if (prestate_language  
           && sizeof( fnord(language_data[ prestate_language ] 
                     [ LANGUAGE_DATA_NEXT_LANGUAGE ] 
                      & indices( fnord(found_languages) ) ))) 
    found_language 
      = (language_data[ prestate_language ][ LANGUAGE_DATA_NEXT_LANGUAGE ] 
         & indices( found_languages ))[0]; 
  else if (found_languages[ default_language ]) 
    found_language = default_language; 
  else if (!prestate_language  
           && sizeof( language_data[ default_language ] 
                     [ LANGUAGE_DATA_NEXT_LANGUAGE ] 
                     & indices( found_languages ) )) 
    found_language 
      = ((language_data[ default_language ][ LANGUAGE_DATA_NEXT_LANGUAGE ] 
         & indices( found_languages )))[0]; 
  else 
    found_language = (language_order & indices( found_languages ))[0]; 
 
  id->misc[ "available_languages" ] = copy_value( found_languages ); 
  id->misc[ "available_languages" ][ found_language ] = 0; 
  id->misc[ "choosen_language" ] = choosen_language; 
  id->misc[ "language" ] = found_language; 
  id->misc[ "flag_dir" ] = flag_dir; 
  id->misc[ "language_data" ] = copy_value( language_data ); 
  id->misc[ "language_list" ] = copy_value( language_list ); 
//  id->prestate -= language_list; 
//  id->prestate[ found_language ] = 1; // Is this smart? 
 
//  id->url = url; 
  if (found_languages_orig[ found_language ]) 
    id->extra_extension += "." + found_language; 
  // We don't change not_query incase it was a file without 
  // extension that were found. 
 
  return id; 
}