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<?php

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add_filter( 'wpcf7_spam', 'wpcf7_disallowed_list', 10, 2 );

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function wpcf7_disallowed_list( $spam, $submission ) {

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if ( $spam ) {

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return $spam;

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}

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$target = wpcf7_array_flatten( $submission->get_posted_data() );

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$target[] = $submission->get_meta( 'remote_ip' );

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$target[] = $submission->get_meta( 'user_agent' );

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$target = implode( "\n", $target );

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$word = wpcf7_check_disallowed_list( $target );

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$word = wpcf7_apply_filters_deprecated(

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'wpcf7_submission_is_blacklisted',

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array( $word, $submission ),

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'5.3',

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'wpcf7_submission_has_disallowed_words'

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);

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$word = apply_filters(

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'wpcf7_submission_has_disallowed_words',

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$word,

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$submission

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);

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if ( $word ) {

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if ( is_bool( $word ) ) {

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$reason = __( "Disallowed words are used.", 'contact-form-7' );

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} else {

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$reason = sprintf(

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__( "Disallowed words (%s) are used.", 'contact-form-7' ),

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implode( ', ', (array) $word )

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);

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}

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$submission->add_spam_log( array(

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'agent' => 'disallowed_list',

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'reason' => $reason,

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) );

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}

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$spam = (bool) $word;

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return $spam;

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}

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function wpcf7_check_disallowed_list( $target ) {

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$mod_keys = get_option( 'disallowed_keys' );

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if ( is_scalar( $mod_keys ) ) {

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$mod_keys = trim( $mod_keys );

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} else {

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$mod_keys = '';

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}

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if ( '' === $mod_keys ) {

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return false;

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}

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foreach ( explode( "\n", $mod_keys ) as $word ) {

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$word = trim( $word );

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$length = strlen( $word );

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if ( $length < 2 or 256 < $length ) {

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continue;

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}

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$pattern = sprintf( '#%s#i', preg_quote( $word, '#' ) );

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if ( preg_match( $pattern, $target ) ) {

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return $word;

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}

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}

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return false;

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}

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function wpcf7_blacklist_check( $target ) {

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wpcf7_deprecated_function(

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__FUNCTION__,

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'5.3',

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'wpcf7_check_disallowed_list'

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);

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return wpcf7_check_disallowed_list( $target );

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}

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