1 | <?php |
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2 | // +-----------------------------------------------------------------------+ |
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3 | // | Piwigo - a PHP based picture gallery | |
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4 | // +-----------------------------------------------------------------------+ |
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5 | // | Copyright(C) 2008-2009 Piwigo Team http://piwigo.org | |
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6 | // | Copyright(C) 2003-2008 PhpWebGallery Team http://phpwebgallery.net | |
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7 | // | Copyright(C) 2002-2003 Pierrick LE GALL http://le-gall.net/pierrick | |
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8 | // +-----------------------------------------------------------------------+ |
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9 | // | This program is free software; you can redistribute it and/or modify | |
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10 | // | it under the terms of the GNU General Public License as published by | |
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11 | // | the Free Software Foundation | |
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12 | // | | |
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13 | // | This program is distributed in the hope that it will be useful, but | |
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14 | // | WITHOUT ANY WARRANTY; without even the implied warranty of | |
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15 | // | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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16 | // | General Public License for more details. | |
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17 | // | | |
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18 | // | You should have received a copy of the GNU General Public License | |
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19 | // | along with this program; if not, write to the Free Software | |
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20 | // | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
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21 | // | USA. | |
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22 | // +-----------------------------------------------------------------------+ |
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23 | |
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24 | |
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25 | /** |
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26 | * returns search rules stored into a serialized array in "search" |
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27 | * table. Each search rules set is numericaly identified. |
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28 | * |
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29 | * @param int search_id |
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30 | * @return array |
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31 | */ |
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32 | function get_search_array($search_id) |
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33 | { |
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34 | if (!is_numeric($search_id)) |
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35 | { |
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36 | die('Search id must be an integer'); |
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37 | } |
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38 | |
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39 | $query = ' |
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40 | SELECT rules |
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41 | FROM '.SEARCH_TABLE.' |
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42 | WHERE id = '.$search_id.' |
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43 | ;'; |
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44 | list($serialized_rules) = pwg_db_fetch_row(pwg_query($query)); |
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45 | |
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46 | return unserialize($serialized_rules); |
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47 | } |
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48 | |
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49 | /** |
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50 | * returns the SQL clause from a search identifier |
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51 | * |
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52 | * Search rules are stored in search table as a serialized array. This array |
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53 | * need to be transformed into an SQL clause to be used in queries. |
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54 | * |
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55 | * @param array search |
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56 | * @return string |
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57 | */ |
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58 | function get_sql_search_clause($search) |
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59 | { |
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60 | // SQL where clauses are stored in $clauses array during query |
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61 | // construction |
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62 | $clauses = array(); |
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63 | |
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64 | foreach (array('file','name','comment','author') as $textfield) |
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65 | { |
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66 | if (isset($search['fields'][$textfield])) |
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67 | { |
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68 | $local_clauses = array(); |
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69 | foreach ($search['fields'][$textfield]['words'] as $word) |
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70 | { |
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71 | array_push($local_clauses, $textfield." LIKE '%".$word."%'"); |
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72 | } |
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73 | |
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74 | // adds brackets around where clauses |
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75 | $local_clauses = prepend_append_array_items($local_clauses, '(', ')'); |
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76 | |
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77 | array_push( |
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78 | $clauses, |
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79 | implode( |
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80 | ' '.$search['fields'][$textfield]['mode'].' ', |
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81 | $local_clauses |
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82 | ) |
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83 | ); |
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84 | } |
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85 | } |
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86 | |
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87 | if (isset($search['fields']['allwords'])) |
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88 | { |
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89 | $fields = array('file', 'name', 'comment', 'author'); |
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90 | // in the OR mode, request bust be : |
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91 | // ((field1 LIKE '%word1%' OR field2 LIKE '%word1%') |
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92 | // OR (field1 LIKE '%word2%' OR field2 LIKE '%word2%')) |
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93 | // |
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94 | // in the AND mode : |
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95 | // ((field1 LIKE '%word1%' OR field2 LIKE '%word1%') |
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96 | // AND (field1 LIKE '%word2%' OR field2 LIKE '%word2%')) |
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97 | $word_clauses = array(); |
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98 | foreach ($search['fields']['allwords']['words'] as $word) |
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99 | { |
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100 | $field_clauses = array(); |
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101 | foreach ($fields as $field) |
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102 | { |
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103 | array_push($field_clauses, $field." LIKE '%".$word."%'"); |
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104 | } |
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105 | // adds brackets around where clauses |
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106 | array_push( |
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107 | $word_clauses, |
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108 | implode( |
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109 | "\n OR ", |
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110 | $field_clauses |
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111 | ) |
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112 | ); |
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113 | } |
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114 | |
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115 | array_walk( |
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116 | $word_clauses, |
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117 | create_function('&$s','$s="(".$s.")";') |
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118 | ); |
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119 | |
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120 | array_push( |
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121 | $clauses, |
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122 | "\n ". |
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123 | implode( |
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124 | "\n ". |
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125 | $search['fields']['allwords']['mode']. |
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126 | "\n ", |
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127 | $word_clauses |
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128 | ) |
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129 | ); |
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130 | } |
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131 | |
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132 | foreach (array('date_available', 'date_creation') as $datefield) |
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133 | { |
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134 | if (isset($search['fields'][$datefield])) |
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135 | { |
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136 | array_push( |
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137 | $clauses, |
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138 | $datefield." = '".$search['fields'][$datefield]['date']."'" |
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139 | ); |
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140 | } |
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141 | |
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142 | foreach (array('after','before') as $suffix) |
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143 | { |
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144 | $key = $datefield.'-'.$suffix; |
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145 | |
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146 | if (isset($search['fields'][$key])) |
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147 | { |
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148 | array_push( |
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149 | $clauses, |
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150 | |
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151 | $datefield. |
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152 | ($suffix == 'after' ? ' >' : ' <'). |
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153 | ($search['fields'][$key]['inc'] ? '=' : ''). |
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154 | " '".$search['fields'][$key]['date']."'" |
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155 | |
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156 | ); |
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157 | } |
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158 | } |
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159 | } |
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160 | |
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161 | if (isset($search['fields']['cat'])) |
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162 | { |
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163 | if ($search['fields']['cat']['sub_inc']) |
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164 | { |
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165 | // searching all the categories id of sub-categories |
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166 | $cat_ids = get_subcat_ids($search['fields']['cat']['words']); |
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167 | } |
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168 | else |
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169 | { |
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170 | $cat_ids = $search['fields']['cat']['words']; |
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171 | } |
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172 | |
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173 | $local_clause = 'category_id IN ('.implode(',', $cat_ids).')'; |
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174 | array_push($clauses, $local_clause); |
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175 | } |
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176 | |
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177 | // adds brackets around where clauses |
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178 | $clauses = prepend_append_array_items($clauses, '(', ')'); |
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179 | |
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180 | $where_separator = |
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181 | implode( |
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182 | "\n ".$search['mode'].' ', |
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183 | $clauses |
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184 | ); |
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185 | |
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186 | $search_clause = $where_separator; |
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187 | |
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188 | return $search_clause; |
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189 | } |
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190 | |
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191 | /** |
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192 | * returns the list of items corresponding to the advanced search array |
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193 | * |
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194 | * @param array search |
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195 | * @return array |
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196 | */ |
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197 | function get_regular_search_results($search, $images_where) |
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198 | { |
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199 | global $conf; |
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200 | $forbidden = get_sql_condition_FandF( |
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201 | array |
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202 | ( |
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203 | 'forbidden_categories' => 'category_id', |
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204 | 'visible_categories' => 'category_id', |
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205 | 'visible_images' => 'id' |
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206 | ), |
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207 | "\n AND" |
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208 | ); |
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209 | |
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210 | $items = array(); |
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211 | $tag_items = array(); |
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212 | |
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213 | if (isset($search['fields']['tags'])) |
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214 | { |
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215 | $tag_items = get_image_ids_for_tags( |
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216 | $search['fields']['tags']['words'], |
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217 | $search['fields']['tags']['mode'] |
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218 | ); |
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219 | } |
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220 | |
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221 | $search_clause = get_sql_search_clause($search); |
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222 | |
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223 | if (!empty($search_clause)) |
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224 | { |
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225 | $query = ' |
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226 | SELECT DISTINCT(id) |
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227 | FROM '.IMAGES_TABLE.' i |
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228 | INNER JOIN '.IMAGE_CATEGORY_TABLE.' AS ic ON id = ic.image_id |
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229 | WHERE '.$search_clause; |
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230 | if (!empty($images_where)) |
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231 | { |
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232 | $query .= "\n AND ".$images_where; |
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233 | } |
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234 | if (empty($tag_items) or $search['mode']=='AND') |
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235 | { // directly use forbidden and order by |
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236 | $query .= $forbidden.' |
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237 | '.$conf['order_by']; |
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238 | } |
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239 | $items = array_from_query($query, 'id'); |
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240 | } |
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241 | |
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242 | if ( !empty($tag_items) ) |
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243 | { |
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244 | $need_permission_check = false; |
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245 | switch ($search['mode']) |
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246 | { |
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247 | case 'AND': |
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248 | if (empty($search_clause)) |
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249 | { |
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250 | $need_permission_check = true; |
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251 | $items = $tag_items; |
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252 | } |
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253 | else |
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254 | { |
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255 | $items = array_intersect($items, $tag_items); |
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256 | } |
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257 | break; |
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258 | case 'OR': |
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259 | $before_count = count($items); |
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260 | $items = array_unique( |
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261 | array_merge( |
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262 | $items, |
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263 | $tag_items |
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264 | ) |
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265 | ); |
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266 | if ( $before_count < count($items) ) |
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267 | { |
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268 | $need_permission_check = true; |
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269 | } |
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270 | break; |
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271 | } |
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272 | if ($need_permission_check and count($items) ) |
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273 | { |
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274 | $query = ' |
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275 | SELECT DISTINCT(id) |
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276 | FROM '.IMAGES_TABLE.' i |
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277 | INNER JOIN '.IMAGE_CATEGORY_TABLE.' AS ic ON id = ic.image_id |
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278 | WHERE id IN ('.implode(',', $items).') '.$forbidden; |
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279 | if (!empty($images_where)) |
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280 | { |
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281 | $query .= "\n AND ".$images_where; |
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282 | } |
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283 | $query .= ' |
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284 | '.$conf['order_by']; |
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285 | $items = array_from_query($query, 'id'); |
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286 | } |
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287 | } |
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288 | |
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289 | return $items; |
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290 | } |
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291 | |
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292 | /** |
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293 | * returns the LIKE sql clause corresponding to the quick search query $q |
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294 | * and the field $field. example q='john bill', field='file' will return |
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295 | * file LIKE '%john%' OR file LIKE '%bill%'. Special characters for MySql full |
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296 | * text search (+,<,>,~) are omitted. The query can contain a phrase: |
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297 | * 'Pierre "New York"' will return LIKE '%Pierre%' OR LIKE '%New York%'. |
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298 | * @param string q |
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299 | * @param string field |
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300 | * @return string |
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301 | */ |
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302 | function get_qsearch_like_clause($q, $field, $before='%', $after='%') |
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303 | { |
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304 | $q = stripslashes($q); |
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305 | $tokens = array(); |
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306 | $token_modifiers = array(); |
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307 | $crt_token = ""; |
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308 | $crt_token_modifier = ""; |
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309 | $state = 0; |
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310 | |
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311 | for ($i=0; $i<strlen($q); $i++) |
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312 | { |
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313 | $ch = $q[$i]; |
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314 | switch ($state) |
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315 | { |
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316 | case 0: |
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317 | if ($ch=='"') |
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318 | { |
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319 | if (strlen($crt_token)) |
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320 | { |
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321 | $tokens[] = $crt_token; |
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322 | $token_modifiers[] = $crt_token_modifier; |
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323 | $crt_token = ""; |
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324 | $crt_token_modifier = ""; |
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325 | } |
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326 | $state=1; |
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327 | } |
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328 | elseif ( $ch=='*' ) |
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329 | { // wild card |
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330 | $crt_token .= '%'; |
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331 | } |
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332 | elseif ( strcspn($ch, '+-><~')==0 ) |
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333 | { //special full text modifier |
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334 | if (strlen($crt_token)) |
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335 | { |
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336 | $tokens[] = $crt_token; |
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337 | $token_modifiers[] = $crt_token_modifier; |
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338 | $crt_token = ""; |
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339 | $crt_token_modifier = ""; |
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340 | } |
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341 | $crt_token_modifier .= $ch; |
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342 | } |
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343 | elseif (preg_match('/[\s,.;!\?]+/', $ch)) |
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344 | { // white space |
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345 | if (strlen($crt_token)) |
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346 | { |
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347 | $tokens[] = $crt_token; |
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348 | $token_modifiers[] = $crt_token_modifier; |
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349 | $crt_token = ""; |
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350 | $crt_token_modifier = ""; |
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351 | } |
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352 | } |
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353 | else |
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354 | { |
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355 | if ( strcspn($ch, '%_')==0) |
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356 | {// escape LIKE specials %_ |
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357 | $ch = '\\'.$ch; |
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358 | } |
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359 | $crt_token .= $ch; |
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360 | } |
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361 | break; |
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362 | case 1: // qualified with quotes |
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363 | switch ($ch) |
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364 | { |
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365 | case '"': |
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366 | $tokens[] = $crt_token; |
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367 | $token_modifiers[] = $crt_token_modifier; |
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368 | $crt_token = ""; |
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369 | $crt_token_modifier = ""; |
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370 | $state=0; |
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371 | break; |
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372 | default: |
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373 | if ( strcspn($ch, '%_')==0) |
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374 | {// escape LIKE specials %_ |
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375 | $ch = '\\'.$ch; |
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376 | } |
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377 | $crt_token .= $ch; |
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378 | } |
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379 | break; |
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380 | } |
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381 | } |
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382 | if (strlen($crt_token)) |
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383 | { |
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384 | $tokens[] = $crt_token; |
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385 | $token_modifiers[] = $crt_token_modifier; |
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386 | } |
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387 | |
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388 | $clauses = array(); |
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389 | for ($i=0; $i<count($tokens); $i++) |
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390 | { |
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391 | $tokens[$i] = trim($tokens[$i], '%'); |
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392 | if (strstr($token_modifiers[$i], '-')!==false) |
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393 | continue; |
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394 | if ( strlen($tokens[$i])==0) |
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395 | continue; |
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396 | $clauses[] = $field.' LIKE "'.$before.addslashes($tokens[$i]).$after.'"'; |
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397 | } |
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398 | |
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399 | return count($clauses) ? '('.implode(' OR ', $clauses).')' : null; |
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400 | } |
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401 | |
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402 | |
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403 | /** |
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404 | * returns the search results corresponding to a quick/query search. |
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405 | * A quick/query search returns many items (search is not strict), but results |
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406 | * are sorted by relevance unless $super_order_by is true. Returns: |
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407 | * array ( |
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408 | * 'items' => array(85,68,79...) |
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409 | * 'qs' => array( |
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410 | * 'matching_tags' => array of matching tags |
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411 | * 'matching_cats' => array of matching categories |
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412 | * 'matching_cats_no_images' =>array(99) - matching categories without images |
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413 | * )) |
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414 | * |
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415 | * @param string q |
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416 | * @param bool super_order_by |
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417 | * @param string images_where optional aditional restriction on images table |
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418 | * @return array |
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419 | */ |
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420 | function get_quick_search_results($q, $super_order_by, $images_where='') |
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421 | { |
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422 | $search_results = |
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423 | array( |
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424 | 'items' => array(), |
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425 | 'qs' => array('q'=>stripslashes($q)), |
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426 | ); |
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427 | $q = trim($q); |
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428 | if (empty($q)) |
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429 | { |
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430 | return $search_results; |
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431 | } |
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432 | $q_like_field = '@@__db_field__@@'; //something never in a search |
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433 | $q_like_clause = get_qsearch_like_clause($q, $q_like_field ); |
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434 | |
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435 | |
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436 | // Step 1 - first we find matches in #images table =========================== |
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437 | $where_clauses='MATCH(i.name, i.comment) AGAINST( "'.$q.'" IN BOOLEAN MODE)'; |
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438 | if (!empty($q_like_clause)) |
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439 | { |
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440 | $where_clauses .= ' |
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441 | OR '. str_replace($q_like_field, 'CONVERT(file, CHAR)', $q_like_clause); |
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442 | $where_clauses = '('.$where_clauses.')'; |
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443 | } |
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444 | $where_clauses = array($where_clauses); |
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445 | if (!empty($images_where)) |
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446 | { |
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447 | $where_clauses[]='('.$images_where.')'; |
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448 | } |
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449 | $where_clauses[] .= get_sql_condition_FandF |
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450 | ( |
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451 | array( 'visible_images' => 'i.id' ), null, true |
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452 | ); |
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453 | $query = ' |
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454 | SELECT i.id, |
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455 | MATCH(i.name, i.comment) AGAINST( "'.$q.'" IN BOOLEAN MODE) AS weight |
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456 | FROM '.IMAGES_TABLE.' i |
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457 | WHERE '.implode("\n AND ", $where_clauses); |
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458 | |
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459 | $by_weights=array(); |
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460 | $result = pwg_query($query); |
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461 | while ($row = pwg_db_fetch_assoc($result)) |
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462 | { // weight is important when sorting images by relevance |
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463 | if ($row['weight']) |
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464 | { |
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465 | $by_weights[(int)$row['id']] = 2*$row['weight']; |
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466 | } |
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467 | else |
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468 | {//full text does not match but file name match |
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469 | $by_weights[(int)$row['id']] = 2; |
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470 | } |
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471 | } |
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472 | |
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473 | |
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474 | // Step 2 - search tags corresponding to the query $q ======================== |
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475 | if (!empty($q_like_clause)) |
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476 | { // search name and url name (without accents) |
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477 | $query = ' |
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478 | SELECT id, name, url_name |
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479 | FROM '.TAGS_TABLE.' |
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480 | WHERE ('.str_replace($q_like_field, 'CONVERT(name, CHAR)', $q_like_clause).' |
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481 | OR '.str_replace($q_like_field, 'url_name', $q_like_clause).')'; |
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482 | $tags = hash_from_query($query, 'id'); |
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483 | if ( !empty($tags) ) |
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484 | { // we got some tags; get the images |
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485 | $search_results['qs']['matching_tags']=$tags; |
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486 | $query = ' |
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487 | SELECT image_id, COUNT(tag_id) AS weight |
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488 | FROM '.IMAGE_TAG_TABLE.' |
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489 | WHERE tag_id IN ('.implode(',',array_keys($tags)).') |
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490 | GROUP BY image_id'; |
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491 | $result = pwg_query($query); |
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492 | while ($row = pwg_db_fetch_assoc($result)) |
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493 | { // weight is important when sorting images by relevance |
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494 | $image_id=(int)$row['image_id']; |
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495 | @$by_weights[$image_id] += $row['weight']; |
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496 | } |
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497 | } |
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498 | } |
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499 | |
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500 | |
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501 | // Step 3 - search categories corresponding to the query $q ================== |
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502 | global $user; |
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503 | $query = ' |
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504 | SELECT id, name, permalink, nb_images |
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505 | FROM '.CATEGORIES_TABLE.' |
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506 | INNER JOIN '.USER_CACHE_CATEGORIES_TABLE.' ON id=cat_id |
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507 | WHERE user_id='.$user['id'].' |
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508 | AND MATCH(name, comment) AGAINST( "'.$q.'" IN BOOLEAN MODE)'. |
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509 | get_sql_condition_FandF ( |
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510 | array( 'visible_categories' => 'cat_id' ), "\n AND" |
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511 | ); |
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512 | $result = pwg_query($query); |
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513 | while ($row = pwg_db_fetch_assoc($result)) |
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514 | { // weight is important when sorting images by relevance |
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515 | if ($row['nb_images']==0) |
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516 | { |
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517 | $search_results['qs']['matching_cats_no_images'][] = $row; |
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518 | } |
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519 | else |
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520 | { |
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521 | $search_results['qs']['matching_cats'][$row['id']] = $row; |
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522 | } |
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523 | } |
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524 | |
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525 | if ( empty($by_weights) and empty($search_results['qs']['matching_cats']) ) |
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526 | { |
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527 | return $search_results; |
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528 | } |
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529 | |
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530 | // Step 4 - now we have $by_weights ( array image id => weight ) that need |
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531 | // permission checks and/or matching categories to get images from |
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532 | $where_clauses = array(); |
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533 | if ( !empty($by_weights) ) |
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534 | { |
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535 | $where_clauses[]='i.id IN (' |
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536 | . implode(',', array_keys($by_weights)) . ')'; |
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537 | } |
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538 | if ( !empty($search_results['qs']['matching_cats']) ) |
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539 | { |
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540 | $where_clauses[]='category_id IN ('. |
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541 | implode(',',array_keys($search_results['qs']['matching_cats'])).')'; |
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542 | } |
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543 | $where_clauses = array( '('.implode("\n OR ",$where_clauses).')' ); |
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544 | if (!empty($images_where)) |
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545 | { |
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546 | $where_clauses[]='('.$images_where.')'; |
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547 | } |
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548 | $where_clauses[] = get_sql_condition_FandF( |
---|
549 | array |
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550 | ( |
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551 | 'forbidden_categories' => 'category_id', |
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552 | 'visible_categories' => 'category_id', |
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553 | 'visible_images' => 'i.id' |
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554 | ), |
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555 | null,true |
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556 | ); |
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557 | |
---|
558 | global $conf; |
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559 | $query = ' |
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560 | SELECT DISTINCT(id) |
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561 | FROM '.IMAGES_TABLE.' i |
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562 | INNER JOIN '.IMAGE_CATEGORY_TABLE.' AS ic ON id = ic.image_id |
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563 | WHERE '.implode("\n AND ", $where_clauses)."\n". |
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564 | $conf['order_by']; |
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565 | |
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566 | $allowed_images = array_from_query( $query, 'id'); |
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567 | |
---|
568 | if ( $super_order_by or empty($by_weights) ) |
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569 | { |
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570 | $search_results['items'] = $allowed_images; |
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571 | return $search_results; |
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572 | } |
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573 | |
---|
574 | $allowed_images = array_flip( $allowed_images ); |
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575 | $divisor = 5.0 * count($allowed_images); |
---|
576 | foreach ($allowed_images as $id=>$rank ) |
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577 | { |
---|
578 | $weight = isset($by_weights[$id]) ? $by_weights[$id] : 1; |
---|
579 | $weight -= $rank/$divisor; |
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580 | $allowed_images[$id] = $weight; |
---|
581 | } |
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582 | arsort($allowed_images, SORT_NUMERIC); |
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583 | $search_results['items'] = array_keys($allowed_images); |
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584 | return $search_results; |
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585 | } |
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586 | |
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587 | /** |
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588 | * returns an array of 'items' corresponding to the search id |
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589 | * |
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590 | * @param int search id |
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591 | * @param string images_where optional aditional restriction on images table |
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592 | * @return array |
---|
593 | */ |
---|
594 | function get_search_results($search_id, $super_order_by, $images_where='') |
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595 | { |
---|
596 | $search = get_search_array($search_id); |
---|
597 | if ( !isset($search['q']) ) |
---|
598 | { |
---|
599 | $result['items'] = get_regular_search_results($search, $images_where); |
---|
600 | return $result; |
---|
601 | } |
---|
602 | else |
---|
603 | { |
---|
604 | return get_quick_search_results($search['q'], $super_order_by, $images_where); |
---|
605 | } |
---|
606 | } |
---|
607 | ?> |
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