1 | /**********************************************************************
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2 | *
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3 | * receptionist.h -- a web interface for the gsdl
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4 | * Copyright (C) 1999 The New Zealand Digital Library Project
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5 | *
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6 | * PUT COPYRIGHT NOTICE HERE
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7 | *
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8 | * $Id: receptionist.h 189 1999-03-05 03:53:56Z sjboddie $
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9 | *
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10 | *********************************************************************/
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11 |
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12 |
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13 | #ifndef RECEPTIONIST_H
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14 | #define RECEPTIONIST_H
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15 |
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16 | #include "gsdlconf.h"
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17 | #include "text_t.h"
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18 | #include "cgiargs.h"
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19 | #include "display.h"
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20 | #include "action.h"
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21 | #include "recptproto.h"
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22 | #include "converter.h"
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23 |
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24 | #ifndef MACROPRECEDENCE
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25 | #define MACROPRECEDENCE "style,collection,queryversion,version,language"
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26 | #endif
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27 |
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28 |
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29 | struct recptconf {
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30 | text_t gsdlhome;
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31 | text_t collection; // will equal "" in 'general' mode
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32 | text_t collectdir; // will equal gsdlhome in 'general' mode
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33 | text_t httpimg;
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34 | text_t gwcgi;
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35 | text_tarray macrofiles;
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36 | text_t saveconf;
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37 | };
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38 |
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39 |
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40 | class receptionist {
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41 | protected:
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42 | recptconf configinfo;
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43 |
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44 | cgiargsinfoclass argsinfo;
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45 | actionmapclass actions;
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46 | recptprotolistclass protocols;
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47 | displayclass disp;
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48 | convertinfoclass converters;
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49 | // prepare_page sets up page parameters, sets display macros
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50 | // and opens the page ready for output
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51 | void prepare_page (action *a, cgiargsclass &args, recptproto *collectproto,
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52 | ostream &logout);
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53 | void define_general_macros (cgiargsclass &args, ostream &logout);
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54 |
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55 | public:
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56 | receptionist () {}
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57 | virtual ~receptionist() {}
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58 |
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59 | // add_action makes another action available to the receptionist
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60 | // the action remains the property of the calling code and that
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61 | // code should destroy the action after the recptionist has been
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62 | // destroyed.
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63 | void add_action (action *theaction) {actions.addaction(theaction);}
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64 | actionmapclass *get_actionmap_ptr () {return &actions;}
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65 |
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66 | // add_protocol makes another protocol available to the receptionist
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67 | // without any protocols, no collections will be available. The
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68 | // protocols remain the property of the calling code.
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69 | void add_protocol (recptproto *theprotocol) {protocols.addrecptproto(theprotocol);}
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70 | recptprotolistclass *get_recptprotolist_ptr () {return &protocols;}
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71 |
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72 | // add_converter makes another converter available to the receptionist.
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73 | // Converters are needed to display pages using different encodings.
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74 | // The converters remain the property of the calling code.
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75 | void add_converter (const text_t &name, inconvertclass *inconverter,
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76 | rzwsoutconvertclass *outconverter)
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77 | {converters.add_converter(name, inconverter, outconverter);}
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78 | convertinfoclass *get_convertinfo_ptr () {return &converters;}
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79 |
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80 |
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81 | // configure should be called for each line in the
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82 | // configuration files to configure the receptionist and everything
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83 | // it contains. The configuration should take place after everything
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84 | // has been added but before the initialisation.
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85 | void configure (const text_t &key, const text_tarray &cfgline);
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86 | void configure (const text_t &key, const text_t &value);
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87 | const recptconf &get_configinfo () {return configinfo;}
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88 | cgiargsinfoclass *get_cgiargsinfo_ptr () {return &argsinfo;}
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89 |
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90 |
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91 | // init should be called after all the actions, protocols, and
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92 | // converters have been added to the receptionist and after everything
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93 | // has been configured but before any pages are created.
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94 | // It returns true on success and false on failure. If false is
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95 | // returned getpage should not be called (without producing
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96 | // meaningless output), instead an error page should be
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97 | // produced by the calling code.
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98 | bool init (ostream &logout);
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99 |
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100 | // There are two ways to produce a page. You can either call parse_cgi_args,
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101 | // get_cgihead_info, and produce_content or you can just call parse_cgi_args and
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102 | // produce_cgi_page (which will be satisfactory in most cases). You might want to call
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103 | // parse_cgi_args, get_cgihead_info, and produce_content when you want to
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104 | // interface directly with a web server for which the standard header is inappropriate.
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105 |
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106 | // parse_cgi_args parses cgi arguments into an argument class.
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107 | // This function should be called for each page request. It returns false
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108 | // if there was a major problem with the cgi arguments.
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109 | bool parse_cgi_args (const text_t &argstr, cgiargsclass &args, ostream &logout);
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110 |
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111 | // produce_cgi_page will call get_cgihead_info and
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112 | // produce_content in the appropriate way to output a cgi header and
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113 | // the page content (if needed). If a page could not be created it
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114 | // will return false
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115 | bool produce_cgi_page (cgiargsclass &args, ostream &contentout,
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116 | ostream &logout);
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117 |
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118 | // get_cgihead_info determines the cgi header information for
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119 | // a set of cgi arguments. If response contains location then
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120 | // response_data contains the redirect address. If reponse
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121 | // contains content then reponse_data contains the content-type.
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122 | // Note that images can now be produced by the receptionist.
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123 | void get_cgihead_info (cgiargsclass &args, response_t &response,
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124 | text_t &response_data, ostream &logout);
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125 |
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126 | // produce the page content
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127 | bool produce_content (cgiargsclass &args, ostream &contentout,
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128 | ostream &logout);
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129 |
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130 | // returns the compressed argument ("e") corresponding to the argument
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131 | // list. This can be used to save preferences between sessions.
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132 | text_t get_compressed_arg (const cgiargsclass &args);
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133 |
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134 | protected:
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135 | // will read in all the macro files. If one is not found an
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136 | // error message will be written to logout and the method will
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137 | // return false.
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138 | bool read_macrofiles (ostream &logout);
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139 |
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140 | // Will define the main general arguments used by the receptionist.
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141 | // If an error occurs a message will be written to logout and the
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142 | // method will return false.
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143 | virtual bool define_mainargs (ostream &logout);
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144 |
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145 | // check_mainargs will check all the main arguments. If a major
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146 | // error is found it will return false and no cgi page should
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147 | // be created using the arguments.
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148 | virtual bool check_mainargs (cgiargsclass &args, ostream &logout);
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149 | };
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150 |
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151 |
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152 | #endif
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