1 | /**********************************************************************
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2 | *
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3 | * z3950proto.cpp --
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4 | * Copyright (C) 2000 The New Zealand Digital Library Project
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5 | *
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6 | * A component of the Greenstone digital library software
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7 | * from the New Zealand Digital Library Project at the
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8 | * University of Waikato, New Zealand.
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9 | *
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10 | * This program is free software; you can redistribute it and/or modify
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11 | * it under the terms of the GNU General Public License as published by
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12 | * the Free Software Foundation; either version 2 of the License, or
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13 | * (at your option) any later version.
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14 | *
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15 | * This program is distributed in the hope that it will be useful,
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | * GNU General Public License for more details.
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19 | *
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20 | * You should have received a copy of the GNU General Public License
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21 | * along with this program; if not, write to the Free Software
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22 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | *
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24 | *********************************************************************/
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25 |
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26 | #include "z3950proto.h"
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27 | #include "comtypes.h"
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28 | #include "browsefilter.h"
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29 | #include "queryfilter.h"
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30 | #include "filter.h"
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31 | // z39.50 yaz stuff
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32 | #include <stdio.h> // for (FILE *) type for yyin and fopen.
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33 | // config file parsing stuff
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34 | #include "z3950cfg.h" // for reading in config files -
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35 | // defines "struct z3950cfg *zserver_list" as the head of the list.
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36 | extern FILE *yyin;
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37 | extern "C" {
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38 | extern int zconfigparse();
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39 | }
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40 |
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41 |
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42 |
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43 |
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44 | z3950proto::z3950proto() {
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45 | zserver_count=0;
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46 | }
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47 |
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48 | z3950proto::~z3950proto() {
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49 | }
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50 |
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51 | void z3950proto::add_server (z3950_server& zserver) {
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52 |
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53 | // append the new server
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54 | zserver_count++;
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55 | zservers.push_back(&zserver);
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56 | }
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57 |
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58 | void z3950proto::read_config_file(const text_t &filename) {
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59 | struct z3950cfg *here;
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60 | struct z3950cfg *oldhere;
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61 | z3950_server *zserver;
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62 | ShortColInfo_t *tempinfo;
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63 |
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64 | // zconfigparse() is defined in zparse.tab.c,
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65 | // which is the bison output of zparse.y
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66 |
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67 | yyin=fopen(filename.getcstr(),"r");
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68 | if (yyin==NULL) {
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69 | cerr << "Could not open "<<filename.getcstr()<<" for reading.\n";
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70 | }
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71 | zconfigparse();
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72 | // we now have the config files in the ptr zserver_list
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73 | if (zserver_list==NULL)
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74 | return; // no valid servers found in the config file - note that
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75 | // the parser will have already spat out any errors.
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76 |
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77 | // now create z3950servers for each structure in server_list
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78 | here=zserver_list;
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79 | while (here!=NULL) {
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80 | zserver=new z3950_server;
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81 | tempinfo=new ShortColInfo_t;
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82 |
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83 | tempinfo->host.setcstr(here->hostname);
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84 | tempinfo->port=here->port;
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85 | tempinfo->name.setcstr(here->dbname);
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86 | zserver->setInfo(tempinfo);
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87 | zserver->setName(here->shortname);
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88 | // now collection metadata.
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89 | zserver->setMeta("collectionname",here->longname);
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90 | if (here->icon!=NULL)
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91 | zserver->setMeta("iconcollection",here->icon);
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92 | if (here->smallicon!=NULL)
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93 | zserver->setMeta("iconcollectionsmall",here->smallicon);
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94 |
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95 | /* filterclass *filter = new filterclass ();
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96 | zserver->add_filter (filter);
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97 | browsefilterclass *browsefilter = new browsefilterclass();
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98 | zserver->add_filter (browsefilter);
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99 | queryfilterclass *queryfilter = new queryfilterclass();
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100 | zserver->add_filter (queryfilter);
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101 | */
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102 |
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103 | // About list
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104 | if (here->about!=NULL) {
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105 | struct z3950aboutlist *about_here=here->about;
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106 | struct z3950aboutlist *oldabout;
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107 |
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108 | while (about_here!=NULL) {
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109 | // problem with default lang (null): can't add ("",..)
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110 | if (about_here->lang==NULL)
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111 | zserver->addcfgAbout("en",about_here->text);
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112 | else
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113 | zserver->addcfgAbout(about_here->lang, about_here->text);
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114 | oldabout=about_here;
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115 | about_here=about_here->next;
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116 | free(oldabout->lang);
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117 | free(oldabout->text);
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118 | free(oldabout);
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119 | }
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120 | }
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121 |
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122 | oldhere=here;
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123 | here=here->next;
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124 | free(oldhere->shortname);
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125 | free(oldhere->hostname);
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126 | free(oldhere->dbname);
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127 | free(oldhere->longname);
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128 | free(oldhere->icon);
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129 | free(oldhere->smallicon);
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130 | free(oldhere);
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131 |
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132 | add_server(*zserver);
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133 | } // end of while loop.
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134 |
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135 | }
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136 |
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137 | void z3950proto::configure (const text_t &key,
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138 | const text_tarray &cfgline) {
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139 |
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140 | // this is called for each line in the gsdlsite.cfg file
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141 |
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142 | if (0)
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143 | cerr << "z3950proto::configure called:"
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144 | << "key is " << key.getcstr()
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145 | << "\n1st line is " << cfgline[0].getcstr() << endl;
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146 |
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147 | }
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148 |
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149 |
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150 | bool z3950proto::init (ostream &/*logout*/) {
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151 | // set up tcp connection to server here?
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152 | // we might also read in the config file here (instead of librarymain.cpp)
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153 |
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154 | //
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155 |
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156 | // logout goes to initout.txt
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157 | // logout <<"zdebug:init:Number of z3950 servers: "<< zserver_count << "\n";
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158 | //logout << "\t1st server name: " << zservers[0].getName().getcstr() << "\n";
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159 | return true;
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160 |
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161 | }
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162 |
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163 | /*text_t z3950proto::get_protocol_name () {
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164 | return "z3950proto";
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165 | }
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166 | */
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167 |
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168 | void z3950proto::get_collection_list (text_tarray &collist,
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169 | comerror_t &/*err*/,
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170 | ostream &/*logout*/) {
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171 | // logout here DOESN'T go to initout.txt
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172 | // logout << "zdebug: get_collection_list called:\n";
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173 |
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174 | /** *** for now, we are assuming that each SERVER is a GSDL collection,
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175 | as opposed to each DATABASE on the servers.
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176 | */
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177 | z3950_server_array::iterator here = zservers.begin();
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178 | z3950_server_array::iterator end = zservers.end();
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179 | while (here != end) {
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180 | collist.push_back((*here)->getName());
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181 | //const ShortColInfo_t *info=here->getInfo();
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182 | //collist.push_back(info->name);
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183 | here++;
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184 | }
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185 | }
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186 |
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187 | void z3950proto::has_collection (const text_t &collection, bool &hascollection,
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188 | comerror_t &/*err*/, ostream &/*logout*/) {
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189 | z3950_server_array::iterator here = zservers.begin();
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190 | z3950_server_array::iterator end = zservers.end();
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191 | while (here != end) {
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192 | if((*here)->getName()==collection) {
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193 | hascollection=true;
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194 | return;
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195 | }
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196 | here++;
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197 | }
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198 | hascollection=false;
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199 | }
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200 |
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201 | void z3950proto::ping (const text_t &/*collection*/, bool &wassuccess,
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202 | comerror_t &/*err*/, ostream &/*logout*/) {
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203 | // should we just ping the server, or actually create a connection
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204 | // to the z39.50 server process on the machine ?
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205 | wassuccess = true;
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206 | }
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207 |
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208 | void z3950proto::get_collectinfo (const text_t &collection,
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209 | ColInfoResponse_t &collectinfo,
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210 | comerror_t &err, ostream &logout) {
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211 |
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212 | // set err to protocolError if something goes wrong...
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213 |
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214 | z3950_server_array::iterator here = zservers.begin();
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215 | z3950_server_array::iterator end = zservers.end();
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216 | while (here != end) {
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217 | if((*here)->getName()==collection) {
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218 | break;
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219 | }
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220 | here++;
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221 | }
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222 |
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223 | if (here==end) {
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224 | err=protocolError;
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225 | logout << "z39.50: couldn't find collection"
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226 | << collection.getcstr()
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227 | << endl;
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228 | return;
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229 | }
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230 |
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231 | const ShortColInfo_t *colinfo=(*here)->getInfo();
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232 | collectinfo.shortInfo.name=colinfo->name;
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233 | collectinfo.shortInfo.host=colinfo->host;
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234 | collectinfo.shortInfo.port=colinfo->port;
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235 |
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236 | collectinfo.isPublic=true;
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237 | // don't use beta field
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238 | /*collectinfo.isBeta=false;*/
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239 | collectinfo.buildDate=1;
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240 | // leave ccsCols empty (no cross-coll. searching - for now)
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241 | /*collectinfo.ccsCols=(text_tarray);*/ //not like this!!!
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242 | // This info is available from the config file -- johnmcp
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243 | /*******collectinfo.languages.push_back("en");
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244 | collectinfo.languages.push_back("fr");********/
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245 | collectinfo.numDocs=0;
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246 | collectinfo.numWords=0;
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247 | collectinfo.numBytes=0;
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248 | // copy the text maps over.
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249 | // collectinfo.collectionmeta; // text_tmap
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250 | collectinfo.collectionmeta=*((*here)->getMeta());
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251 | collectinfo.format=*((*here)->getFormat()); //text_tmap
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252 | /* collectinfo.building; //text_tmap */
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253 |
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254 | ////collectinfo.receptionist="z3950";
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255 | /* for now... this is a url, relative to .../cgi-bin.
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256 | NOTE: if this is empty, it defaults to _gwcgi_?a=p&p=about&c=<colname>
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257 | */
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258 | }
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259 |
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260 | void z3950proto::get_filterinfo (const text_t &/*collection*/,
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261 | InfoFiltersResponse_t &response,
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262 | comerror_t &/*err*/, ostream &/*logout*/) {
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263 | // we'll fake it here, and say we have set up some filters
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264 | response.filterNames.insert("BrowseFilter");
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265 | response.filterNames.insert("QueryFilter");
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266 | response.filterNames.insert("NullFilter");
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267 |
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268 | }
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269 |
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270 | void z3950proto::get_filteroptions (const text_t &/*collection*/,
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271 | const InfoFilterOptionsRequest_t &/*req*/,
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272 | InfoFilterOptionsResponse_t &response,
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273 | comerror_t &err, ostream &/*logout*/) {
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274 | // for now, assume all servers have the same characteristics
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275 | /* if (request.filterName=="QueryFilter") { }
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276 | else if (request.filterName=="BrowseFilter") { }
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277 | else if (request.filterName=="NullFilter") { } */
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278 | response.filterOptions["Index"].type=FilterOption_t::stringt;
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279 | response.filterOptions["Index"].repeatable=FilterOption_t::onePerQuery;
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280 | response.filterOptions["Index"].defaultValue="any";
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281 | response.filterOptions["Index"].validValues.push_back(".any");
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282 | response.filterOptions["Index"].validValues.push_back(".title");
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283 | response.filterOptions["Index"].validValues.push_back(".author");
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284 | // and maybe ["Language"] option as well?
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285 | err=noError;
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286 | }
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287 |
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288 | void z3950proto::filter (const text_t &collection,
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289 | FilterRequest_t &request,
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290 | FilterResponse_t &response,
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291 | comerror_t &err, ostream &logout) {
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292 | // this function is called when:
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293 | // * creating the title page,(looking for iconcoll* & collectname metadata)
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294 | // * creating the about page (looking for "Title" metadata)
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295 | // * doing the query - (note that a request for metadata comes first, then
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296 | // filterOptions = FRmetadata | FROID | FRtermFreq (64+4+1)
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297 |
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298 | // metadata-only requests have filterName="NullFilter", else "QueryFilter".
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299 | // For the title page, we should not create a connection to the target
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300 | // (target means the actual z39.50 server, origin means us), but
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301 | // for the about page and query pages, we need to get information from the
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302 | // origin. (eg for the about page, we will print out some info such as ID,
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303 | // name and version.
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304 |
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305 | // cerr now goes to errout.txt in etc directory
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306 | err=noError;
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307 |
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308 | // get relevant "collection"
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309 | z3950_server_array::iterator zserver = zservers.begin();
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310 | z3950_server_array::iterator zend = zservers.end();
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311 | while (zserver != zend) {
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312 | if((*zserver)->getName()==collection) {
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313 | break;
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314 | }
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315 | zserver++;
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316 | }
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317 | // now have collection in zserver.
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318 |
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319 | ColInfoResponse_t info;
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320 | ResultDocInfo_t *docInfo;
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321 |
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322 | // leave response.termInfo empty
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323 | // response.termInfo.push_back(""); ??????? (should be empty if not req.)
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324 |
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325 | // See if this is for a query action
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326 | if (request.filterName=="QueryFilter") {
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327 | /* Sample OptionValue pairs
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328 | `StartResults'=`1'
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329 | `EndResults'=`20'
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330 | `Term'=`firstword secondword' (term is just whatever the user typed in)
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331 | `QueryType'=`ranked' => 'OR' (cgiarg t=1)
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332 | `QueryType' = `boolean' => 'AND' (cgiarg t=0)
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333 | `Casefold'=`true'
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334 | `Stem'=`false'
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335 | `Maxdocs'=`50'
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336 | */
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337 | // go through options
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338 | text_t opt_term; // the term(s) that the user entered
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339 | text_t opt_fields; // which fields to search on
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340 | int opt_start=1, opt_end=20; // default values
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341 | int nummatches=0, maxdocs=50; // default values
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342 | OptionValue_tarray::iterator ov_here=request.filterOptions.begin();
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343 | OptionValue_tarray::iterator ov_end=request.filterOptions.end();
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344 | while (ov_here != ov_end) {
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345 | // cout << "OV pair: `" << ov_here->name.getcstr() << "'=`"
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346 | // << ov_here->value.getcstr() << "'\n";
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347 | if (ov_here->name=="Term")
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348 | {
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349 | opt_term=ov_here->value;
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350 | } else if (ov_here->name=="Index")
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351 | {
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352 | opt_fields=ov_here->value;
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353 | } else if (ov_here->name=="StartResults")
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354 | {
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355 | opt_start=ov_here->value.getint();
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356 | } else if (ov_here->name=="EndResults")
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357 | {
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358 | opt_end=ov_here->value.getint();
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359 | } else if (ov_here->name=="Maxdocs")
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360 | {
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361 | maxdocs=ov_here->value.getint();
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362 | }
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363 | ov_here++;
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364 | }
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365 | err=noError;
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366 | text_tarray *titles=(*zserver)->getrecordTitles(opt_term,
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367 | opt_fields,
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368 | opt_start, // first to get
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369 | opt_end-opt_start, //count
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370 | &nummatches,err);
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371 | if (err!=noError) {
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372 | // can we return an err msg in a response, or just use
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373 | // the more drastic Greenstone error mechanism?
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374 | docInfo=new ResultDocInfo_t;
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375 | response.docInfo.push_back(*docInfo);
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376 | docInfo->metadata["Title"].values.push_back("Error - query err?");
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377 | logout << "\nz3950 filter query: error connecting to server\n";
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378 | // for now, DON'T use GSDL protocol err.
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379 | err=noError;
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380 | return;
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381 | }
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382 | // check if (titles==NULL) - only happens on error?
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383 | if (nummatches>0) {
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384 | text_tarray::iterator titles_here=titles->begin();
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385 | text_tarray::iterator titles_end=titles->end();
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386 | int counter=1;
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387 | while (titles_here!=titles_end) {
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388 | docInfo=new ResultDocInfo_t;
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389 | docInfo->metadata["Title"].values.push_back(*titles_here);
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390 | docInfo->result_num=counter;
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391 | // we need to give some OID, so we'll just use counter for now...
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392 | // make it the number into the whole possible retrieved set.
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393 | docInfo->OID=counter+opt_start-1;
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394 | response.docInfo.push_back(*docInfo);
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395 | counter++;
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396 | titles_here++;
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397 | }
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398 | }
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399 |
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400 | if (request.filterResultOptions & FRtermFreq) {
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401 | if (nummatches>maxdocs) {
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402 | response.numDocs=maxdocs; // eg "more than 50" (if Maxdocs==50)
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403 | response.isApprox=MoreThan;
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404 | } else {
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405 | response.numDocs=nummatches; // eg "36 documents"
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406 | response.isApprox=Exact; // Exact | Approximate | MoreThan
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407 | }
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408 | } // end of if (... & FRtermFreq)
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409 |
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410 | } // end of if (... & FROID)
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411 | else {
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412 | // this wasn't a query action
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413 |
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414 | if (request.filterOptions.size()>0 &&
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415 | request.filterOptions[0].name=="ParentNode") {
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416 | // don't want to return anything
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417 | return;
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418 | /* } else if (request.docSet.size() &&
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419 | request.docSet[0]!="collection") {
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420 | // documentaction
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421 | // if docSet is not empty, it is either "collection", or an array
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422 | // of OIDs
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423 | docInfo=new ResultDocInfo_t;
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424 | response.docInfo.push_back(*docInfo);
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425 | */
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426 | } else {
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427 | // in case we need to return only metadata
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428 | docInfo=new ResultDocInfo_t;
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429 | response.docInfo.push_back(*docInfo);
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430 | }
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431 | }
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432 |
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433 | // Fill in metadata for each response.docInfo (if wanted)
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434 | if (request.filterResultOptions & FRmetadata) {
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435 | get_collectinfo (collection, info, err, logout);
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436 | // should check err returned here....
|
---|
437 |
|
---|
438 | // get the Query out of the filterOptions.
|
---|
439 | text_t query="";
|
---|
440 | text_t field="";
|
---|
441 | OptionValue_tarray::iterator opt_here=request.filterOptions.begin();
|
---|
442 | OptionValue_tarray::iterator opt_end=request.filterOptions.end();
|
---|
443 | while (opt_here!=opt_end) {
|
---|
444 | if (opt_here->name=="Query") {
|
---|
445 | query=opt_here->value;
|
---|
446 | if (field!="") break; // break from loop if we've got both
|
---|
447 | } else if (opt_here->name=="Index") {
|
---|
448 | field=opt_here->value;
|
---|
449 | if (query!="") break; // break from loop if we've got both
|
---|
450 | }
|
---|
451 | opt_here++;
|
---|
452 | }
|
---|
453 |
|
---|
454 | if (!request.fields.empty()) {
|
---|
455 | // loop on each document being returned
|
---|
456 | ResultDocInfo_tarray::iterator docs_here=response.docInfo.begin();
|
---|
457 | ResultDocInfo_tarray::iterator docs_end=response.docInfo.end();
|
---|
458 | while (docs_here!=docs_end) {
|
---|
459 |
|
---|
460 | // loop on all the metadata fields in request.fields (type text_tset)
|
---|
461 | text_tset::iterator fields_here=request.fields.begin();
|
---|
462 | text_tset::iterator fields_end=request.fields.end();
|
---|
463 | text_tmap::iterator it;
|
---|
464 | while (fields_here!=fields_end) {
|
---|
465 | it=info.collectionmeta.find(*fields_here);
|
---|
466 | ////////// cerr << "filter: getting " << (*fields_here).getcstr();
|
---|
467 | if (it!=info.collectionmeta.end())
|
---|
468 | docs_here->metadata[*fields_here].values.push_back((*it).second);
|
---|
469 | else if (*fields_here=="Title" && !request.docSet.empty()) {
|
---|
470 | // We only do this for a document action.
|
---|
471 | // (This comes through as a NullQuery).
|
---|
472 | // hopefully docSet is only not empty for documentaction...
|
---|
473 | text_t doctitle;
|
---|
474 | int i;
|
---|
475 | // check that docSet isn't empty first!!!!!!
|
---|
476 | i=request.docSet[0].getint();
|
---|
477 | text_t doctext="unneeded";
|
---|
478 | (*zserver)->getfullrecord(query, field, i, doctitle, doctext, err);
|
---|
479 | // check err value!
|
---|
480 | docs_here->metadata["Title"].values.push_back(doctitle);
|
---|
481 | } else {
|
---|
482 | docs_here->metadata[*fields_here].values.push_back("");
|
---|
483 | /////// cerr << " (not found)";
|
---|
484 | }
|
---|
485 | ////////cerr << "\n";
|
---|
486 | fields_here++;
|
---|
487 | } // end of inner while loop
|
---|
488 | docs_here++;
|
---|
489 | } // end of outer while loop
|
---|
490 | } // end of if (!request.fields.empty())
|
---|
491 |
|
---|
492 | else { // request.fields empty: return all metadata for about page or query
|
---|
493 | // we'll only put it in the first docInfo.
|
---|
494 | text_tmap::iterator colmeta_here=info.collectionmeta.begin();
|
---|
495 | text_tmap::iterator colmeta_end=info.collectionmeta.end();
|
---|
496 | while (colmeta_here!=colmeta_end) {
|
---|
497 | response.docInfo[0].metadata[(*colmeta_here).first].
|
---|
498 | values.push_back((*colmeta_here).second);
|
---|
499 | /////cerr << "\t" << (*colmeta_here).first.getcstr() << "\n";
|
---|
500 | colmeta_here++;
|
---|
501 | }
|
---|
502 |
|
---|
503 | // check if "collectionextra" metadata is set. If it isn't, we should
|
---|
504 | // create connection to target to get it.
|
---|
505 | if (info.collectionmeta.find("collectionextra")==colmeta_end) {
|
---|
506 | // it hasn't been set yet...
|
---|
507 | text_t abouttext="<B>Server Online</B><br>\n";
|
---|
508 | abouttext+=(*zserver)->getzAbout();
|
---|
509 | // add in the "About" text we read in from config file.
|
---|
510 | // how do we incorporate multi-lingual metadata?
|
---|
511 | abouttext+="<P>\n";
|
---|
512 | text_t tmpabout;
|
---|
513 |
|
---|
514 | if ((*zserver)->getcfgAbout("en", tmpabout)==true)
|
---|
515 | abouttext+=tmpabout;
|
---|
516 |
|
---|
517 | (*zserver)->setMeta("collectionextra",abouttext);
|
---|
518 | response.docInfo[0].metadata["collectionextra"].values.push_back(abouttext);
|
---|
519 | }
|
---|
520 | } // end of else
|
---|
521 |
|
---|
522 | // do indices' names, regardless of whether asked for or not...
|
---|
523 | if (!response.docInfo.empty()) {
|
---|
524 | response.docInfo[0].metadata[".author"].values.push_back("author fields");
|
---|
525 | response.docInfo[0].metadata[".title"].values.push_back("title fields");
|
---|
526 | response.docInfo[0].metadata[".any"].values.push_back("any fields");
|
---|
527 | }
|
---|
528 | } //end of if (... & FRmetadata) ...
|
---|
529 | }
|
---|
530 |
|
---|
531 |
|
---|
532 |
|
---|
533 | void z3950proto::get_document (const text_t &collection,
|
---|
534 | const DocumentRequest_t &request,
|
---|
535 | DocumentResponse_t &response,
|
---|
536 | comerror_t &err, ostream &logout) {
|
---|
537 |
|
---|
538 | err=noError;
|
---|
539 |
|
---|
540 | // get relevant "collection"
|
---|
541 | z3950_server_array::iterator zserver = zservers.begin();
|
---|
542 | z3950_server_array::iterator zend = zservers.end();
|
---|
543 | while (zserver != zend) {
|
---|
544 | if((*zserver)->getName()==collection) {
|
---|
545 | break;
|
---|
546 | }
|
---|
547 | zserver++;
|
---|
548 | }
|
---|
549 | // now have collection in zserver.
|
---|
550 |
|
---|
551 | /* cout << "get document:\n\tOID: " << request.OID.getcstr()
|
---|
552 | << "\n\tdocType: " << request.docType.getcstr()
|
---|
553 | << "\n\tdocFormat: " << request.docFormat.getcstr() <<"\n";
|
---|
554 | */
|
---|
555 |
|
---|
556 | /* docresponse consists of
|
---|
557 | text_t response.doc */
|
---|
558 | text_t title="unneeded";
|
---|
559 | text_t doctext;
|
---|
560 | text_t query; // this should not be needed, as we have already connected to
|
---|
561 | // get the title....
|
---|
562 | text_t field; // ditto...
|
---|
563 | (*zserver)->getfullrecord(query,field,request.OID.getint(),
|
---|
564 | title,doctext,err);
|
---|
565 | // check return value of above? (false=>not connected)
|
---|
566 | if (err==noError)
|
---|
567 | response.doc=doctext;
|
---|
568 | else {
|
---|
569 | // could print out different messages based on error type....
|
---|
570 | response.doc="<h2>Error</h2>There was an error while connecting to the ";
|
---|
571 | response.doc+="z39.50 server (ie target). Most likely this was a \n";
|
---|
572 | response.doc+="\"Connection Refused\" error.\n";
|
---|
573 |
|
---|
574 | }
|
---|
575 | if (0) {
|
---|
576 | err=protocolError;
|
---|
577 | logout << "Some error\n";
|
---|
578 | }
|
---|
579 | }
|
---|