source: trunk/gsdl/src/recpt/receptionist.cpp@ 183

/**********************************************************************
 *
 * receptionist.cpp -- a web interface for the gsdl
 * Copyright (C) 1999  The New Zealand Digital Library Project
 *
 * PUT COPYRIGHT NOTICE HERE
 *
 * $Id: receptionist.cpp 173 1999-02-28 20:00:19Z rjmcnab $
 *
 *********************************************************************/

/*
   $Log$
   Revision 1.9  1999/02/28 20:00:16  rjmcnab


   Fixed a few things.

   Revision 1.8  1999/02/25 21:58:59  rjmcnab

   Merged sources.

   Revision 1.7  1999/02/21 22:33:55  rjmcnab

   Lots of stuff :-)

   Revision 1.6  1999/02/11 01:24:05  rjmcnab

   Fixed a few compiler warnings.

   Revision 1.5  1999/02/08 01:28:02  rjmcnab

   Got the receptionist producing something using the statusaction.

   Revision 1.4  1999/02/05 10:42:46  rjmcnab

   Continued working on receptionist

   Revision 1.3  1999/02/04 10:00:56  rjmcnab

   Developed the idea of an "action" and having them define the cgi arguments
   which they need and how those cgi arguments function.

   Revision 1.2  1999/02/04 01:17:27  rjmcnab

   Got it outputing something.


 */


#include "receptionist.h"
#include "fileutil.h"
#include "cgiutils.h"
#include <assert.h>
#include <time.h>



// configure should be called for each line in the
// configuration files to configure the receptionist and everything
// it contains. The configuration should take place after everything
// has been added but before the initialisation.
void receptionist::configure (const text_t &key, const text_tarray &cfgline) {
  // configure the receptionist
  if (cfgline.size() >= 1) {
    if (key == "gsdlhome") configinfo.gsdlhome = cfgline[0];
    else if (key == "collection") configinfo.collection = cfgline[0];
    else if (key == "collectdir") configinfo.collectdir = cfgline[0];
    else if (key == "httpimg") configinfo.httpimg = cfgline[0];
    else if (key == "gwcgi") configinfo.gwcgi = cfgline[0];
    else if (key == "macrofiles") configinfo.macrofiles = cfgline;
    else if (key == "saveconf") configinfo.saveconf = cfgline[0];
  }

  // configure the actions
  actionptrmap::iterator actionhere = actions.begin ();
  actionptrmap::iterator actionend = actions.end ();

  while (actionhere != actionend) {
    assert ((*actionhere).second.a != NULL);
    if ((*actionhere).second.a != NULL) 
      (*actionhere).second.a->configure(key, cfgline);

    actionhere++;
  }

  // configure the protocols
  recptprotolistclass::iterator protohere = protocols.begin ();
  recptprotolistclass::iterator protoend = protocols.end ();

  while (protohere != protoend) {
    assert ((*protohere).p != NULL);
    if ((*protohere).p != NULL) 
      (*protohere).p->configure(key, cfgline);
    
    protohere++;
  }
}

void receptionist::configure (const text_t &key, const text_t &value) {
  text_tarray cfgline;
  cfgline.push_back (value);
  configure(key, cfgline);
}


// init should be called after all the actions, protocols, and
// converters have been added to the receptionist and after everything
// has been configured but before any pages are created.
// It returns true on success and false on failure. If false is
// returned getpage should not be called (without producing
// meaningless output), instead an error page should be
// produced by the calling code.
bool receptionist::init (ostream &logout) {
  // first configure collectdir
  text_t thecollectdir = configinfo.gsdlhome;
  if (!configinfo.collection.empty()) {
    // collection specific mode
    if (!configinfo.collectdir.empty()) {
      // has already been configured
      thecollectdir = configinfo.collectdir;
    } else {
      // decide where collectdir is by searching for collect.cfg
      // look in $GSDLHOME/collect/collection-name/etc/collect.cfg and
      // then $GSDLHOME/etc/collect.cfg
      text_t thecollectdir = filename_cat (configinfo.gsdlhome, "collect");
      thecollectdir = filename_cat (thecollectdir, configinfo.collection);
      text_t filename = filename_cat (thecollectdir, "etc");
      filename = filename_cat (filename, "collect.cfg");
      if (!file_exists(filename)) thecollectdir = configinfo.gsdlhome;
    }
  }
  configure("collectdir", thecollectdir);

  // read in the macro files
  if (!read_macrofiles (logout)) return false;

  // defined the main cgi arguments
  if (!define_mainargs (logout)) return false;

  // there must be at least one action defined
  if (actions.empty()) {
    logout << "Error: no actions have been added to the receptionist\n";
    return false;
  }

  // add the cgi arguments from the actions
  actionptrmap::iterator here = actions.begin ();
  actionptrmap::iterator end = actions.end ();
  while (here != end) {
    assert ((*here).second.a != NULL);
    if ((*here).second.a != NULL) {
      if (!argsinfo.addarginfo (&logout, (*here).second.a->getargsinfo()))
    return false;
    }
    here++;
  }

  // create a saveconf string if there isn't one already
  if (configinfo.saveconf.empty())
    configinfo.saveconf = create_save_conf_str (argsinfo, logout);

  // check the saveconf string
  if (!check_save_conf_str (configinfo.saveconf, argsinfo, logout))
    return false;

  // set a random seed
  srand (time(NULL));

  // make the output converters remove all the zero-width spaces
  convertinfoclass::iterator converthere = converters.begin ();
  convertinfoclass::iterator convertend = converters.end ();
  text_t defaultconvertname;
  while (converthere != convertend) {
    assert ((*converthere).second.outconverter != NULL);
    if ((*converthere).second.outconverter != NULL) {
      (*converthere).second.outconverter->set_rzws(1);
      if (defaultconvertname.empty())
    defaultconvertname = (*converthere).second.name;
    }
    converthere++;
  }

  // set default converter if no good one has been defined
  if (!defaultconvertname.empty()) {
    cgiarginfo *ainfo = argsinfo.getarginfo ("w");
    if ((ainfo != NULL) && (ainfo->defaultstatus < cgiarginfo::good)) {
      ainfo->defaultstatus = cgiarginfo::good;
      ainfo->argdefault = defaultconvertname;
    }
  }
  
  // init the actions
  actionptrmap::iterator actionhere = actions.begin ();
  actionptrmap::iterator actionend = actions.end ();
  while (actionhere != actionend) {
    if (((*actionhere).second.a == NULL) || 
    !(*actionhere).second.a->init(logout)) return false;
    actionhere++;
  }

  // init the protocols
  recptprotolistclass::iterator protohere = protocols.begin ();
  recptprotolistclass::iterator protoend = protocols.end ();
  while (protohere != protoend) {
    if (((*protohere).p == NULL) ||
    !(*protohere).p->init(logout)) return false;
    protohere++;
  }

  return true;
}


// parse_cgi_args parses cgi arguments into an argument class.
// This function should be called for each page request. It returns false
// if there was a major problem with the cgi arguments.
bool receptionist::parse_cgi_args (const text_t &argstr, cgiargsclass &args, 
                   ostream &logout) {
  outconvertclass text_t2ascii;

  // get an initial list of cgi arguments
  args.clear();
  split_cgi_args (argstr, args);

  // expand the compressed argument (if there was one)
  if (!expand_save_args (argsinfo, configinfo.saveconf, args, logout)) return false;

  // add the defaults
  add_default_args (argsinfo, args, logout);

  // check the main cgi arguments
  if (!check_mainargs (args, logout)) return false;

  // check the arguments for the action
  action *a = actions.getaction (args["a"]);
  if (a != NULL) {
    if (!a->check_cgiargs (args, logout)) return false;
  } else {
    // the action was not found!!
    logout << text_t2ascii << "Error: the action \"" << args["a"] 
       << "\" could not be found.\n";
    return false;
  }

  // get the input encoding
  text_t &arg_w = args["w"];
  inconvertclass defaultinconvert;
  inconvertclass *inconvert = converters.get_inconverter (arg_w);
  if (inconvert == NULL) inconvert = &defaultinconvert;

  // see if the next page will have a different encoding
  if (args.getarg("nw") != NULL) args["w"] = args["nw"];

  // convert arguments which aren't in unicode to unicode
  args_tounicode (args, *inconvert);

  return true;
}


// produce_cgi_page will call get_cgihead_info and 
// produce_content in the appropriate way to output a cgi header and
// the page content (if needed). If a page could not be created it
// will return false
bool receptionist::produce_cgi_page (cgiargsclass &args, ostream &contentout, 
                     ostream &logout) {
  outconvertclass text_t2ascii;

  response_t response;
  text_t response_data;

  // produce cgi header
  get_cgihead_info (args, response, response_data, logout);
  if (response == location) {
    // I've forgotten how to do this :-/
    return true;
  } else if (response == content) {
    // content response
    contentout << text_t2ascii << "Content-type: " << response_data << "\n\n";
  } else {
    // unknown response
    logout << "Error: get_cgihead_info returned an unknown response type.\n";
    return false;
  }

  // produce cgi page
  if (!produce_content (args, contentout, logout)) return false;

  // flush contentout
  contentout << flush;
  return true;
}


// get_cgihead_info determines the cgi header information for
// a set of cgi arguments. If response contains location then
// response_data contains the redirect address. If reponse
// contains content then reponse_data contains the content-type.
// Note that images can now be produced by the receptionist.
void receptionist::get_cgihead_info (cgiargsclass &args, response_t &response,
                     text_t &response_data, ostream &logout) {
  outconvertclass text_t2ascii;

  // get the action
  action *a = actions.getaction (args["a"]);
  if (a != NULL) {
    a->get_cgihead_info (args, response, response_data, logout);

  } else {
    // the action was not found!!
    logout << text_t2ascii << "Error receptionist::get_cgihead_info: the action \"" 
       << args["a"] << "\" could not be found.\n";
    response = content;
    response_data = "text/html";
  }
}


// produce the page content
bool receptionist::produce_content (cgiargsclass &args, ostream &contentout,
                    ostream &logout) {
  // decide on the output conversion class
  text_t &arg_w = args["w"];
  rzwsoutconvertclass defaultoutconverter;
  rzwsoutconvertclass *outconverter = converters.get_outconverter (arg_w);
  if (outconverter == NULL) outconverter = &defaultoutconverter;
  outconverter->reset();

  // decide on the protocol used for communicating with
  // the collection server
  recptproto *collectproto = NULL;
  if (!args["c"].empty()) {
    collectproto = protocols.getrecptproto (args["c"], logout);
  }

  // produce the page using the desired action
  action *a = actions.getaction (args["a"]);
  if (a != NULL) {
    if (a->uses_display(args)) prepare_page (a, args, collectproto, disp, logout);
    if (!a->do_action (args, collectproto, disp, (*outconverter), contentout, logout))
      return false;

  } else {
    // the action was not found!!
    outconvertclass text_t2ascii;

    logout << text_t2ascii << "Error receptionist::produce_content: the action \"" 
       << args["a"] << "\" could not be found.\n";
    
    contentout << (*outconverter) 
           << "<html>\n"
           << "<head>\n"
           << "<title>Error</title>\n"
           << "</head>\n"
           << "<body>\n"
           << "<h2>Oops!</h2>\n"
           << "Undefined Page. The action \"" 
           << args["a"] << "\" could not be found.\n"
           << "</body>\n"
           << "</html>\n";
  }

  return true;
}


// returns the compressed argument ("e") corresponding to the argument
// list. This can be used to save preferences between sessions.
text_t receptionist::get_compressed_arg (const cgiargsclass &/*args*/) {
  return "";
}


// will read in all the macro files. If one is not found an
// error message will be written to logout and the method will
// return false.
bool receptionist::read_macrofiles (ostream &logout) {
  outconvertclass text_t2ascii;

  // redirect the error output to logout
  disp.setlogout (&logout);

  // load up the default macro files, the collection directory
  // is searched first for the file (if this is being used in
  // collection specific mode) and then the main directory
  text_t colmacrodir = filename_cat (configinfo.collectdir, "macros");
  text_t gsdlmacrodir = filename_cat (configinfo.gsdlhome, "macros");
  text_tarray::iterator arrhere = configinfo.macrofiles.begin();
  text_tarray::iterator arrend = configinfo.macrofiles.end();
  text_t filename;
  while (arrhere != arrend) {
    // filename is used as a flag to indicate whether
    // the macro file has been found
    filename.clear();

    // try in the collection directory if this is being
    // run in collection specific mode
    if (!configinfo.collection.empty()) {
      filename = filename_cat (colmacrodir, *arrhere);
      if (!file_exists (filename)) filename.clear ();
    }

    // if we haven't found the macro file yet try in
    // the main macro directory
    if (filename.empty()) {
      filename = filename_cat (gsdlmacrodir, *arrhere);
      if (!file_exists (filename)) filename.clear ();
    }

    // see if we found the file or not
    if (filename.empty()) {
      logout << text_t2ascii 
         << "Error: the macro file \"" << *arrhere << "\" could not be found.\n";
      if (configinfo.collection.empty()) {
    logout << text_t2ascii
           << "It should be in " << gsdlmacrodir << ".\n\n";
      } else {
    logout << text_t2ascii
           << "It should be in either " << colmacrodir << " or in " 
           << gsdlmacrodir << ".\n\n";
      }
      return false;

    } else { // found the file
      disp.loaddefaultmacros(filename);
    }

    arrhere++;
  }

  // success
  return true;
}


// Will define the main general arguments used by the receptionist.
// If an error occurs a message will be written to logout and the
// method will return false.
bool receptionist::define_mainargs (ostream &logout) {
  // create a list of cgi arguments
  cgiarginfo ainfo;

  ainfo.shortname = "e";
  ainfo.longname = "compressed arguments";
  ainfo.multiplechar = true;
  ainfo.defaultstatus = cgiarginfo::good;
  ainfo.argdefault = "";
  ainfo.savedarginfo = cgiarginfo::mustnot;
  if (!argsinfo.addarginfo (&logout, ainfo)) return false;

  ainfo.shortname = "a";
  ainfo.longname = "action";
  ainfo.multiplechar = true;
  ainfo.defaultstatus = cgiarginfo::none;
  ainfo.argdefault = "";
  ainfo.savedarginfo = cgiarginfo::must;
  if (!argsinfo.addarginfo (&logout, ainfo)) return false;

  // w=western
  ainfo.shortname = "w";
  ainfo.longname = "encoding";
  ainfo.multiplechar = true;
  ainfo.defaultstatus = cgiarginfo::weak;
  ainfo.argdefault = "w";
  ainfo.savedarginfo = cgiarginfo::must;
  if (!argsinfo.addarginfo (&logout, ainfo)) return false;
  
  ainfo.shortname = "nw";
  ainfo.longname = "new encoding";
  ainfo.multiplechar = true;
  ainfo.defaultstatus = cgiarginfo::none;
  ainfo.argdefault = "";
  ainfo.savedarginfo = cgiarginfo::mustnot;
  if (!argsinfo.addarginfo (&logout, ainfo)) return false;
  
  ainfo.shortname = "c";
  ainfo.longname = "collection";
  ainfo.multiplechar = true;
  if (configinfo.collection.empty()) {
    ainfo.defaultstatus = cgiarginfo::none;
    ainfo.argdefault = "";
    ainfo.savedarginfo = cgiarginfo::must;
  } else {
    ainfo.defaultstatus = cgiarginfo::good;
    ainfo.argdefault = configinfo.collection;
    ainfo.savedarginfo = cgiarginfo::can;
  }
  if (!argsinfo.addarginfo (&logout, ainfo)) return false;
  
  // 0=text+graphics, 1=text
  ainfo.shortname = "v";
  ainfo.longname = "version";
  ainfo.multiplechar = false;
  ainfo.defaultstatus = cgiarginfo::weak;
  ainfo.argdefault = "0";
  ainfo.savedarginfo = cgiarginfo::can;
  if (!argsinfo.addarginfo (&logout, ainfo)) return false;
  
  // 0=normal, 1=big
  ainfo.shortname = "f";
  ainfo.longname = "query box size";
  ainfo.multiplechar = false;
  ainfo.defaultstatus = cgiarginfo::weak;
  ainfo.argdefault = "0";
  ainfo.savedarginfo = cgiarginfo::can;
  if (!argsinfo.addarginfo (&logout, ainfo)) return false;
  
  // the interface language name should use the ISO 639
  // standard
  ainfo.shortname = "l";
  ainfo.longname = "interface language";
  ainfo.multiplechar = true;
  ainfo.defaultstatus = cgiarginfo::weak;
  ainfo.argdefault = "en";
  ainfo.savedarginfo = cgiarginfo::must;
  if (!argsinfo.addarginfo (&logout, ainfo)) return false;

  return true;
}
 
 
// check_mainargs will check all the main arguments. If a major
// error is found it will return false and no cgi page should
// be created using the arguments.
bool receptionist::check_mainargs (cgiargsclass &args, ostream &/*logout*/) {
  // if this receptionist is running in collection dependant mode
  // then it should always set the collection argument to the
  // collection
  if (!configinfo.collection.empty()) args["c"] = configinfo.collection;

  // argument "v" can only be 0 or 1. Use the default value
  // if it is out of range
  int arg_v = args.getintarg ("v");
  if (arg_v != 0 && arg_v != 1) {
    cgiarginfo *vinfo = argsinfo.getarginfo ("v");
    if (vinfo != NULL) args["v"] = vinfo->argdefault;
  }

  // argument "f" can only be 0 or 1. Use the default value
  // if it is out of range
  int arg_f = args.getintarg ("f");
  if (arg_f != 0 && arg_f != 1) {
    cgiarginfo *finfo = argsinfo.getarginfo ("f");
    if (finfo != NULL) args["f"] = finfo->argdefault;
  }

  return true;
}

// prepare_page sets up page parameters, sets display macros
// and opens the page ready for output 
void receptionist::prepare_page (action *a, cgiargsclass &args, recptproto */*collectproto*/, 
                 displayclass &disp, ostream &logout) {
  
  // set up page parameters
  text_t pageparams;

  bool first = true;
  if (!args["c"].empty()) {
    pageparams +=  "collection=" + args["c"]; first = false;}
  if (args.getintarg("u") == 1)
    if (first) {pageparams += "style=htmlonly"; first = false;}
    else pageparams += ",style=htmlonly";
  if (args.getintarg("v") == 1)
    if (first) {pageparams += "version=text"; first = false;}
    else pageparams += ",version=text";
  if (args.getintarg("f") == 1) 
    if (first) {pageparams += ",queryversion=big"; first = false;}
    else pageparams += ",queryversion=big";
  if (args["l"] != "en") 
    if (first) pageparams += ",language=" + args["l"];
    else pageparams += ",language=" + args["l"];
  
  // open the page
  disp.openpage(pageparams, MACROPRECEDENCE);


  // define general macros
  define_general_macros (disp, args, logout);

  
  // define external macros for each action
  actionptrmap::iterator actionhere = actions.begin ();
  actionptrmap::iterator actionend = actions.end ();

  while (actionhere != actionend) {
    assert ((*actionhere).second.a != NULL);
    if ((*actionhere).second.a != NULL) 
      (*actionhere).second.a->define_external_macros (disp, args, logout);
    actionhere++;
  }


  // define internal macros for the current action
  a->define_internal_macros (disp, args, logout);
}

void receptionist::define_general_macros (displayclass &disp, cgiargsclass &args, 
                      ostream &/*logout*/) {

  disp.setmacro ("gwcgi", "Global", configinfo.gwcgi);
  disp.setmacro ("httpimg", "Global", configinfo.httpimg);
  disp.setmacro("compressedoptions", "Global", get_compressed_arg(args));

  // set _cgiargX_ macros for each cgi argument
  cgiargsclass::const_iterator argshere = args.begin();
  cgiargsclass::const_iterator argsend = args.end();
  while (argshere != argsend) {
    disp.setmacro ("cgiarg" + (*argshere).first, "Global", (*argshere).second);
    argshere ++;
  }
}