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| 1 | <?php |
| 2 | /** |
| 3 | * CloudflareOptimizationHeaderFragment |
| 4 | * |
| 5 | * Emits .htaccess rules that set a durable cookie encoding the tuple of |
| 6 | * enabled Cloudflare optimizations (e.g., Mirage/Polish/Fonts). The cookie |
| 7 | * is set only when absent or mismatched, and is skipped for admin/API routes. |
| 8 | * |
| 9 | * @package NewfoldLabs\WP\Module\Performance\Cloudflare\Fragments |
| 10 | * @since 1.0.0 |
| 11 | */ |
| 12 | |
| 13 | namespace NewfoldLabs\WP\Module\Performance\Cloudflare\Fragments; |
| 14 | |
| 15 | use NewfoldLabs\WP\Module\Htaccess\Fragment; |
| 16 | use NewfoldLabs\WP\Module\Htaccess\Context; |
| 17 | |
| 18 | /** |
| 19 | * Fragment: Cloudflare Optimization Header |
| 20 | * |
| 21 | * Sets a cookie `nfd-enable-cf-opt=<hash>` (Max-Age=86400, HttpOnly) to signal |
| 22 | * which Cloudflare optimizations are currently active on the site, enabling |
| 23 | * downstream consumers (e.g., theme/plugin logic, CDN edge logic) to key on it. |
| 24 | * |
| 25 | * @since 1.0.0 |
| 26 | */ |
| 27 | final class CloudflareOptimizationHeaderFragment implements Fragment { |
| 28 | |
| 29 | /** |
| 30 | * Globally-unique fragment identifier used by the registry. |
| 31 | * |
| 32 | * @var string |
| 33 | */ |
| 34 | private $id; |
| 35 | |
| 36 | /** |
| 37 | * Human-friendly marker text printed in BEGIN/END comments. |
| 38 | * |
| 39 | * @var string |
| 40 | */ |
| 41 | private $marker_label; |
| 42 | |
| 43 | /** |
| 44 | * Deterministic cookie value encoding which CF features are enabled. |
| 45 | * |
| 46 | * @var string |
| 47 | */ |
| 48 | private $header_value; |
| 49 | |
| 50 | /** |
| 51 | * Constructor. |
| 52 | * |
| 53 | * @since 1.0.0 |
| 54 | * |
| 55 | * @param string $id Unique fragment ID. |
| 56 | * @param string $marker_label Marker label for readability in the file. |
| 57 | * @param string $header_value Deterministic cookie value reflecting CF features. |
| 58 | */ |
| 59 | public function __construct( $id, $marker_label, $header_value ) { |
| 60 | $this->id = (string) $id; |
| 61 | $this->marker_label = (string) $marker_label; |
| 62 | $this->header_value = (string) $header_value; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Get the unique fragment ID. |
| 67 | * |
| 68 | * @since 1.0.0 |
| 69 | * |
| 70 | * @return string Fragment identifier. |
| 71 | */ |
| 72 | public function id() { |
| 73 | return $this->id; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Execute after core WordPress rules to avoid conflicts. |
| 78 | * |
| 79 | * @since 1.0.0 |
| 80 | * |
| 81 | * @return int Priority constant. |
| 82 | */ |
| 83 | public function priority() { |
| 84 | return self::PRIORITY_POST_WP; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Only one instance of this fragment should render. |
| 89 | * |
| 90 | * @since 1.0.0 |
| 91 | * |
| 92 | * @return bool True if exclusive. |
| 93 | */ |
| 94 | public function exclusive() { |
| 95 | return true; |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Upper-layer logic controls registration; once instantiated, always enabled. |
| 100 | * |
| 101 | * @since 1.0.0 |
| 102 | * |
| 103 | * @param Context $context Context snapshot (unused). |
| 104 | * @return bool True when enabled. |
| 105 | */ |
| 106 | public function is_enabled( $context ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable |
| 107 | return true; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Render the .htaccess rules that set the Cloudflare optimization cookie. |
| 112 | * |
| 113 | * Skips admin/login/API endpoints; sets an env var when the cookie is absent |
| 114 | * or different; then sends `Set-Cookie` via mod_headers conditional on env. |
| 115 | * |
| 116 | * @since 1.0.0 |
| 117 | * |
| 118 | * @param Context $context Context snapshot (unused). |
| 119 | * @return string Rendered fragment including BEGIN/END comments. |
| 120 | */ |
| 121 | public function render( $context ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable |
| 122 | $value = $this->header_value; |
| 123 | $cookie = 'nfd-enable-cf-opt=' . $value; |
| 124 | |
| 125 | $lines = array(); |
| 126 | $lines[] = '# BEGIN ' . $this->marker_label; |
| 127 | |
| 128 | // Gate with mod_rewrite to set an env var only when the cookie is missing/mismatched. |
| 129 | $lines[] = '<IfModule mod_rewrite.c>'; |
| 130 | $lines[] = "\tRewriteEngine On"; |
| 131 | $lines[] = "\t# Skip setting for admin/API routes"; |
| 132 | $lines[] = "\tRewriteCond %{REQUEST_URI} !/wp-admin/ [NC]"; |
| 133 | $lines[] = "\tRewriteCond %{REQUEST_URI} !/wp-login\\.php [NC]"; |
| 134 | $lines[] = "\tRewriteCond %{REQUEST_URI} !/wp-json/ [NC]"; |
| 135 | $lines[] = "\tRewriteCond %{REQUEST_URI} !/xmlrpc\\.php [NC]"; |
| 136 | $lines[] = "\tRewriteCond %{REQUEST_URI} !/admin-ajax\\.php [NC]"; |
| 137 | $lines[] = "\t# Skip if the exact cookie and value are already present"; |
| 138 | $lines[] = "\tRewriteCond %{HTTP_COOKIE} !(^|;\\s*)" . preg_quote( $cookie, '/' ) . ' [NC]'; |
| 139 | $lines[] = "\t# Set env var if we passed all conditions"; |
| 140 | $lines[] = "\tRewriteRule .* - [E=CF_OPT:1]"; |
| 141 | $lines[] = '</IfModule>'; |
| 142 | |
| 143 | // Set the cookie only when env var was set above. |
| 144 | $lines[] = '<IfModule mod_headers.c>'; |
| 145 | $lines[] = "\t# Set cookie only if env var is present (i.e., exact cookie not found)"; |
| 146 | $lines[] = "\tHeader set Set-Cookie \"" . $cookie . '; path=/; Max-Age=86400; HttpOnly" env=CF_OPT'; |
| 147 | $lines[] = '</IfModule>'; |
| 148 | |
| 149 | $lines[] = '# END ' . $this->marker_label; |
| 150 | |
| 151 | return implode( "\n", $lines ); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Optional regex patches (none for this fragment). |
| 156 | * |
| 157 | * @param Context $context Context snapshot (unused). |
| 158 | * @return array |
| 159 | */ |
| 160 | public function patches( $context ) { |
| 161 | return array(); |
| 162 | } |
| 163 | } |