1 | <?php |
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2 | |||
3 | namespace DorsetDigital\CDNRewrite; |
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4 | |||
5 | use SilverStripe\Admin\AdminRootController; |
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6 | use SilverStripe\Control\Director; |
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7 | use SilverStripe\Control\HTTPRequest; |
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8 | use SilverStripe\Control\Middleware\HTTPMiddleware; |
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9 | use SilverStripe\Core\Config\Configurable; |
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10 | use SilverStripe\Core\Injector\Injectable; |
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11 | use SilverStripe\View\HTML; |
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12 | |||
13 | class CDNMiddleware implements HTTPMiddleware |
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14 | { |
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15 | |||
16 | use Injectable; |
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17 | use Configurable; |
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18 | |||
19 | /** |
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20 | * @config |
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21 | * |
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22 | * Enable rewriting |
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23 | * @var bool |
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24 | */ |
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25 | private static $cdn_rewrite = false; |
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26 | |||
27 | /** |
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28 | * @config |
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29 | * |
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30 | * The cdn domain incl. protocol |
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31 | * @var string |
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32 | */ |
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33 | private static $cdn_domain = ''; |
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34 | |||
35 | /** |
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36 | * @config |
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37 | * |
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38 | * Enable rewrite in dev mode |
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39 | * @var bool |
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40 | */ |
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41 | private static $enable_in_dev = false; |
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42 | |||
43 | /** |
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44 | * @config |
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45 | * |
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46 | * Add debug headers for each operation |
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47 | * @var bool |
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48 | */ |
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49 | private static $add_debug_headers = false; |
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50 | |||
51 | /** |
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52 | * @config |
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53 | * |
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54 | * Subdirectory name for the site |
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55 | * @var string |
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56 | */ |
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57 | private static $subdirectory = ''; |
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58 | |||
59 | /** |
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60 | * @config |
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61 | * |
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62 | * Add dns-prefetch links to the html head |
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63 | * @var boolean |
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64 | */ |
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65 | private static $add_prefetch = false; |
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66 | |||
67 | /** |
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68 | * @config |
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69 | * |
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70 | * Array of prefixes we wish to rewrite |
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71 | * @var array |
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72 | */ |
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73 | private static $rewrites = []; |
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74 | |||
75 | /** |
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76 | * Process the request |
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77 | * @param HTTPRequest $request |
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78 | * @param $delegate |
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79 | * @return |
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80 | */ |
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81 | public function process(HTTPRequest $request, callable $delegate) |
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82 | { |
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83 | $response = $delegate($request); |
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84 | |||
85 | if (($this->canRun() === true) && ($response !== null)) { |
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86 | $response->addHeader('X-CDN-Rewrites', 'Enabled'); |
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87 | |||
88 | if ($this->getIsAdmin($request) === false) { |
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89 | $body = $response->getBody(); |
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90 | $this->rewriteTags($body, $response); |
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91 | $this->addPrefetch($body, $response); |
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92 | $response->setBody($body); |
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93 | } |
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94 | |||
95 | if ($this->config()->get('add_debug_headers') == true) { |
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96 | $response->addHeader('X-CDN-Domain', $this->config()->get('cdn_domain')); |
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97 | $response->addHeader('X-CDN-Dir', $this->getSubdirectory()); |
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98 | } |
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99 | |||
100 | if ($this->config()->get('cdn_rewrite') === true) { |
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101 | $response->addHeader('X-CDN-Module', 'Active'); |
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102 | } |
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103 | } |
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104 | |||
105 | return $response; |
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106 | } |
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107 | |||
108 | /** |
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109 | * Check if we're OK to execute |
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110 | * @return bool |
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111 | */ |
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112 | private function canRun() |
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113 | { |
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114 | $confEnabled = $this->config()->get('cdn_rewrite'); |
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115 | $devEnabled = ((!Director::isDev()) || ($this->config()->get('enable_in_dev'))); |
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116 | return ($confEnabled && $devEnabled); |
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117 | } |
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118 | |||
119 | |||
120 | /** |
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121 | * Rewrite all the tags we need |
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122 | * @param $body |
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123 | * @param $response |
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124 | */ |
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125 | private function rewriteTags(&$body, &$response) |
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126 | { |
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127 | $cdn = $this->config()->get('cdn_domain'); |
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128 | $subDir = $this->getSubdirectory(); |
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129 | $prefixes = $this->config()->get('rewrites'); |
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130 | |||
131 | foreach ($prefixes as $prefix) { |
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132 | $cleanPrefix = trim($prefix, '/'); |
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133 | |||
134 | $search = [ |
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135 | 'src="' . $subDir . $cleanPrefix . '/', |
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136 | 'src="/' . $subDir . $cleanPrefix . '/', |
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137 | 'src=\"/' . $subDir . $cleanPrefix . '/', |
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138 | 'href="/' . $subDir . $cleanPrefix . '/', |
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139 | Director::absoluteBaseURL() . $cleanPrefix . '/' |
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140 | ]; |
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141 | |||
142 | $replace = [ |
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143 | 'src="' . $cdn . '/' . $subDir . $cleanPrefix . '/', |
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144 | 'src="' . $cdn . '/' . $subDir . $cleanPrefix . '/', |
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145 | 'src=\"' . $cdn . '/' . $subDir . $cleanPrefix . '/', |
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146 | 'href="' . $cdn . '/' . $subDir . $cleanPrefix . '/', |
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147 | $cdn . '/' . $subDir . $cleanPrefix . '/' |
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148 | ]; |
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149 | |||
150 | $body = str_replace($search, $replace, $body); |
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151 | } |
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152 | } |
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153 | |||
154 | |||
155 | private function addPrefetch(&$body, &$response) |
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156 | { |
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157 | if ($this->config()->get('add_prefetch') === true) { |
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158 | $prefetchTag = $this->getPrefetchTag(); |
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159 | $body = str_replace('<head>', "<head>" . $prefetchTag, $body); |
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160 | if ($this->config()->get('add_debug_headers') == true) { |
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161 | $response->addHeader('X-CDN-Prefetch', 'Enabled'); |
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162 | } |
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163 | } |
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164 | } |
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165 | |||
166 | private function getSubdirectory() |
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167 | { |
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168 | $subDir = trim($this->config()->get('subdirectory'), '/'); |
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169 | if ($subDir != "") { |
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170 | $subDir = $subDir . '/'; |
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171 | } |
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172 | return $subDir; |
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173 | } |
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174 | |||
175 | private function getPrefetchTag() |
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176 | { |
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177 | $atts = [ |
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178 | 'rel' => 'dns-prefetch', |
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179 | 'href' => $this->config()->get('cdn_domain') |
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180 | ]; |
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181 | $pfTag = "\n" . HTML::createTag('link', $atts); |
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182 | |||
183 | return $pfTag; |
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184 | } |
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185 | |||
186 | /** |
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187 | * Determine whether the website is being viewed from an admin protected area or not |
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188 | * (shamelessly based on https://github.com/silverstripe/silverstripe-subsites) |
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189 | * |
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190 | * @param HTTPRequest $request |
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191 | * @return bool |
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192 | */ |
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193 | private function getIsAdmin(HTTPRequest $request) |
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194 | { |
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195 | $adminPath = AdminRootController::admin_url(); |
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196 | $currentPath = rtrim($request->getURL(), '/') . '/'; |
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197 | if (substr($currentPath, 0, strlen($adminPath)) === $adminPath) { |
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198 | return true; |
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199 | } |
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200 | return false; |
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201 | } |
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202 | } |
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203 |
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