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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1133 | // If the caller expects signature verification to occur, check to see if this URL supports it. |
| 1134 | if ( $signature_verification ) { |
| 1135 | /** |
| 1136 | * Filters the list of hosts which should have Signature Verification attempted on. |
| 1137 | * |
| 1138 | * @since 5.2.0 |
| 1139 | * |
| 1140 | * @param string[] $hostnames List of hostnames. |
| 1141 | */ |
| 1142 | $signed_hostnames = apply_filters( 'wp_signature_hosts', array( 'wordpress.org', 'downloads.wordpress.org', 's.w.org' ) ); |
| 1143 | $signature_verification = in_array( parse_url( $url, PHP_URL_HOST ), $signed_hostnames, true ); |
| 1144 | } |
| 1145 | |
| 1146 | // Perform signature valiation if supported. |
| 1147 | if ( $signature_verification ) { |
| 1148 | $signature = wp_remote_retrieve_header( $response, 'x-content-signature' ); |
| 1149 | if ( ! $signature ) { |
| 1150 | // Retrieve signatures from a file if the header wasn't included. |
| 1151 | // WordPress.org stores signatures at $package_url.sig. |