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<?php

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namespace WordfenceLS;

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class Utility_MultisiteConfigurationExtractor {

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private $prefix, $suffix;

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private $suffixOffset;

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public function __construct($prefix, $suffix) {

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$this->prefix = new Utility_MeasuredString($prefix);

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$this->suffix = new Utility_MeasuredString($suffix);

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$this->suffixOffset = -$this->suffix->length;

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}

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/**

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* Parses a `get_user_meta` result array into a more usable format. The input array will be something similar to

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* [

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* 'wp_capabilities' => '...',

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* 'wp_3_capabilities' => '...',

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* 'wp_4_capabilities' => '...',

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* 'wp_10_capabilities' => '...',

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* ]

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* This will return

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* [

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* 1 => '...',

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* 3 => '...',

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* 4 => '...',

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* 10 => '...',

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* ]

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* @param array $values

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* @return array

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private function parseBlogIds($values) {

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$parsed = array();

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foreach ($values as $key => $value) {

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if (substr($key, $this->suffixOffset) === $this->suffix->string && strpos($key, (string) $this->prefix) === 0) {

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$blogId = substr($key, $this->prefix->length, strlen($key) - $this->prefix->length + $this->suffixOffset);

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if (empty($blogId)) {

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$parsed[1] = $value;

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}

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else if (substr($blogId, -1) === '_') {

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$parsed[(int) $blogId] = $value;

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}

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}

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}

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return $parsed;

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}

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/**

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* Filters $values, which is the resulting array from `$this->parseBlogIds` so it contains only the values for the

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* sites in $sites.

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* @param array $values

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* @param array $sites

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* @return array

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private function filterValues($values, $sites) {

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$filtered = array();

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foreach ($sites as $site) {

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$blogId = (int) $site->blog_id;

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$filtered[$blogId] = $values[$blogId];

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}

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return $filtered;

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}

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/**

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* Processes a `get_user_meta` result array to re-key it so the keys are the numerical ID of all multisite blog IDs

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* in `$values` that are still in an active state.

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* @param array $values

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* @return array

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public function extract($values) {

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$parsed = $this->parseBlogIds($values);

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if (empty($parsed))

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return $parsed;

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$sites = Utility_Multisite::retrieve_active_sites(array_keys($parsed));

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return $this->filterValues($parsed, $sites);

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}

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}

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