1 | <?php |
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2 | /** |
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3 | * DOMPDF - PHP5 HTML to PDF renderer |
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4 | * |
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5 | * File: $RCSfile: image_cache.cls.php,v $ |
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6 | * Created on: 2004-08-08 |
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7 | * |
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8 | * Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca> |
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9 | * |
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10 | * This library is free software; you can redistribute it and/or |
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11 | * modify it under the terms of the GNU Lesser General Public |
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12 | * License as published by the Free Software Foundation; either |
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13 | * version 2.1 of the License, or (at your option) any later version. |
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14 | * |
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15 | * This library 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 GNU |
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18 | * Lesser 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 Lesser General Public License |
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21 | * along with this library in the file LICENSE.LGPL; if not, write to the |
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22 | * Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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23 | * 02111-1307 USA |
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24 | * |
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25 | * Alternatively, you may distribute this software under the terms of the |
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26 | * PHP License, version 3.0 or later. A copy of this license should have |
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27 | * been distributed with this file in the file LICENSE.PHP . If this is not |
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28 | * the case, you can obtain a copy at http://www.php.net/license/3_0.txt. |
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29 | * |
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30 | * The latest version of DOMPDF might be available at: |
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31 | * http://www.digitaljunkies.ca/dompdf |
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32 | * |
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33 | * @link http://www.digitaljunkies.ca/dompdf |
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34 | * @copyright 2004 Benj Carson |
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35 | * @author Benj Carson <benjcarson@digitaljunkies.ca> |
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36 | * @package dompdf |
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37 | * @version 0.5.1 |
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38 | */ |
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39 | |
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40 | /* $Id */ |
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41 | |
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42 | /** |
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43 | * Static class that resolves image urls and downloads and caches |
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44 | * remote images if required. |
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45 | * |
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46 | * @access private |
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47 | * @package dompdf |
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48 | */ |
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49 | class Image_Cache { |
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50 | |
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51 | /** |
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52 | * Array of downloaded images. Cached so that identical images are |
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53 | * not needlessly downloaded. |
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54 | * |
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55 | * @var array |
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56 | */ |
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57 | static protected $_cache = array(); |
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58 | |
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59 | |
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60 | /** |
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61 | * Resolve and fetch an image for use. |
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62 | * |
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63 | * @param string $url The url of the image |
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64 | * @param string $proto Default protocol if none specified in $url |
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65 | * @param string $host Default host if none specified in $url |
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66 | * @param string $base_path Default path if none specified in $url |
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67 | * @return array An array with two elements: The local path to the image and the image extension |
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68 | */ |
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69 | static function resolve_url($url, $proto, $host, $base_path) { |
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70 | global $_dompdf_warnings; |
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71 | |
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72 | |
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73 | $resolved_url = null; |
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74 | |
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75 | // Remove dynamic part of url to determine the file extension |
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76 | $tmp = preg_replace('/\?.*/','',$url); |
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77 | |
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78 | // We need to preserve the file extenstion |
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79 | $i = mb_strrpos($tmp, "."); |
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80 | if ( $i === false ) |
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81 | throw new DOMPDF_Exception("Unknown image type: $url."); |
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82 | |
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83 | $ext = mb_strtolower(mb_substr($tmp, $i+1)); |
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84 | |
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85 | $parsed_url = explode_url($url); |
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86 | |
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87 | $remote = ($proto != "" && $proto != "file://"); |
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88 | $remote = $remote || ($parsed_url['protocol'] != ""); |
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89 | |
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90 | if ( !DOMPDF_ENABLE_REMOTE && $remote ) { |
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91 | $resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png"; |
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92 | $ext = "png"; |
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93 | |
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94 | } else if ( DOMPDF_ENABLE_REMOTE && $remote ) { |
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95 | // Download remote files to a temporary directory |
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96 | $url = build_url($proto, $host, $base_path, $url); |
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97 | |
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98 | if ( isset(self::$_cache[$url]) ) { |
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99 | list($resolved_url,$ext) = self::$_cache[$url]; |
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100 | //echo "Using cached image $url (" . $resolved_url . ")\n"; |
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101 | |
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102 | } else { |
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103 | |
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104 | //echo "Downloading file $url to temporary location: "; |
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105 | $resolved_url = tempnam(DOMPDF_TEMP_DIR, "dompdf_img_"); |
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106 | //echo $resolved_url . "\n"; |
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107 | |
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108 | $old_err = set_error_handler("record_warnings"); |
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109 | $image = file_get_contents($url); |
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110 | restore_error_handler(); |
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111 | |
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112 | if ( strlen($image) == 0 ) { |
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113 | $image = file_get_contents(DOMPDF_LIB_DIR . "/res/broken_image.png"); |
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114 | $ext = "png"; |
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115 | } |
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116 | |
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117 | file_put_contents($resolved_url, $image); |
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118 | |
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119 | self::$_cache[$url] = array($resolved_url,$ext); |
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120 | |
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121 | } |
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122 | |
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123 | } else { |
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124 | |
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125 | $resolved_url = build_url($proto, $host, $base_path, $url); |
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126 | |
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127 | //echo $resolved_url . "\n"; |
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128 | |
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129 | } |
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130 | |
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131 | if ( !is_readable($resolved_url) || !filesize($resolved_url) ) { |
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132 | $_dompdf_warnings[] = "File " .$resolved_url . " is not readable or is an empty file.\n"; |
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133 | $resolved_url = DOMPDF_LIB_DIR . "/res/broken_image.png"; |
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134 | $ext = "png"; |
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135 | } |
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136 | |
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137 | // Assume for now that all dynamic images are pngs |
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138 | if ( $ext == "php" ) |
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139 | $ext = "png"; |
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140 | |
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141 | return array($resolved_url, $ext); |
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142 | |
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143 | } |
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144 | |
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145 | /** |
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146 | * Unlink all cached images (i.e. temporary images either downloaded |
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147 | * or converted) |
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148 | */ |
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149 | static function clear() { |
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150 | if ( count(self::$_cache) ) { |
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151 | foreach (self::$_cache as $entry) { |
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152 | list($file, $ext) = $entry; |
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153 | unlink($file); |
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154 | } |
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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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