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annotate Page.inc @ 86:b9654b9c4a66

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Make headers a part of the content, rather than setting them directly.
author Tom Fredrik "BFG" Klaussen <bfg@blenning.no>
date Mon, 15 Oct 2012 18:32:56 +0200
parents 2a8e2f571b24
children 7a9c45b53866
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1 <?
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2 include_once 'ScriptIncludeCache.inc';
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3
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4 /// @cond
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5 $baseDir = dirname(__FILE__);
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6 $cache = ScriptIncludeCache::instance(__FILE__);
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7 $cache->includeOnce('Options.inc', dirname(__FILE__));
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8 /// @endcond
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9
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10 class PageContent
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11 {
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12 public $headers = array();
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13 public $content;
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14
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15 function __construct($content = "")
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16 {
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17 $this->content = $content;
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18 }
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19
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20 function addHeader($txt)
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21 {
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22 array_push($this->headers, $txt);
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23 }
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24
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25 function __toString()
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26 {
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27 return $this->content;
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28 }
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29 }
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30
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31 /**
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32 * Master class for generating a page
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33 */
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34 abstract class Page
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35 {
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36 private $cache;
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37
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38 /**
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39 * Constructs a page
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40 *
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41 * @param $cache optionally sets a cache
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42 */
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43 function __construct($cache = null)
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44 {
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45 $this->setCache($cache);
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46 }
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47
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48 /**
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49 * Set the cache
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50 *
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51 * @param $cache The cache object
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52 */
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53 protected function setCache($cache)
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54 {
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55 $this->cache = $cache;
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56 }
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57
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58 /**
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59 * Get the cache
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60 *
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61 * @return The cache object
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62 */
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63 protected function getCache()
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64 {
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65 return $this->cache;
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66 }
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67
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68 /**
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69 * Decide wether or not this page may be compressed.
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70 *
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71 * Normally this is a check for http headers, but some pages
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72 * eg. pictures may not want to be compressed, and may override this
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73 * function.
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74 *
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75 * @return bool if this page may be compressed
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76 */
78
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77 function mayCompress()
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78 {
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79 return (substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip'));
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80 }
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81
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82 /**
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83 * Decide wether or not this page may be validated.
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84 *
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85 * Normally this is a check for the option novalidate, but this may
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86 * be overridden
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87 *
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88 * @return bool if this page may be validated
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89 */
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90 function mayValidate()
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91 {
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92 return !$_GET['novalidate'];
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93 }
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94
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95
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96 /**
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97 * Turns on compression for this page
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98 *
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99 * @note This may not be reversed
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100 */
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101 function startCompression()
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102 {
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103 ob_start("ob_gzhandler");
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104 }
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105
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106 /**
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107 * Generates the actual content of the page
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108 *
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109 * @return the content buffer
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110 */
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111 abstract function generateContent();
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112
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113 /**
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114 * Finishes all necessary processing to determine the cacheset of this page.
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115 *
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116 * @return bool if this page may be cached
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117 */
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118 abstract function cacheCheck();
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119
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120 /**
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121 * Generates an appropriate response to the request.
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122 *
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123 * Eg. 302 NOT CHANGED, error message or the actual content
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124 */
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125 function genPage()
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126 {
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127 if ($this->cacheCheck()) {
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128 $this->cache->CheckHttpModified();
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129 }
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130 $res = $this->generateContent();
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131 if ($this->mayCompress()) {
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132 $this->startCompression();
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133 }
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134 $t = gettype($res);
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135 if ($t === "string") {
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136 $res = new Content($res);
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137 }
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138 elseif (get_class($res) !== "PageContent") {
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139 throw new InvalidArgumentException("generateContent returned an unexpected type");
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140 }
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141 return $res;
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142 }
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143
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144 function display()
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145 {
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146 $res = $this->genPage();
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147 foreach ($res->headers as $header) {
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148 header($header);
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149 }
78
7c68015b211a Common source for all page generators.
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150 print $res;
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151 }
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152
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153
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154 }
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155 ?>