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<?php |
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namespace MySociety\TheyWorkForYou\Utility; |
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/** |
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* Postcode Utilities |
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* |
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* Utility functions related to postcodes |
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*/ |
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class Postcode |
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{ |
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/** |
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* Postcode To Constituency |
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*/ |
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public static function postcodeToConstituency($postcode) { |
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return self::postcodeToConstituenciesInternal($postcode, true); |
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} |
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/** |
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* Postcode To Constituencies |
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*/ |
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public static function postcodeToConstituencies($postcode) { |
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return self::postcodeToConstituenciesInternal($postcode, false); |
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} |
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/** |
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* Postcode To Constituencies (Internal) |
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* |
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* @param boolean $mp_only |
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*/ |
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private static function postcodeToConstituenciesInternal($postcode, $mp_only) { |
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global $last_postcode, $last_postcode_value; |
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$postcode = preg_replace('#[^a-z0-9]#i', '', $postcode); |
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$postcode = self::canonicalisePostcode($postcode); |
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if ($last_postcode == $postcode) { |
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$return_value = $mp_only ? $last_postcode_value['WMC'] : $last_postcode_value; |
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twfy_debug ("TIME", "Postcode $postcode looked up last time, is " . ( is_array($return_value) ? implode(', ', $return_value) : $return_value )); |
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return $return_value; |
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} |
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if (!validate_postcode($postcode)) { |
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return ''; |
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} |
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$ret = self::postcodeFetchFromDb($postcode); |
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if (!$ret) { |
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$ret = self::postcodeFetchFromMapit($postcode); |
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} |
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if (is_string($ret)) return $ret; |
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$last_postcode = $postcode; |
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$last_postcode_value = $ret; |
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return $mp_only ? $ret['WMC'] : $ret; |
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} |
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/** |
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* Fetch Postcode Information from DB |
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* |
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* @param string $postcode |
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*/ |
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private static function postcodeFetchFromDb($postcode) { |
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$db = new \ParlDB; |
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$q = $db->query('select name from postcode_lookup where postcode = :postcode', array( |
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':postcode' => $postcode |
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))->first(); |
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if ($q) { |
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$name = $q['name']; |
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$country = ''; |
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$parts = explode(';', $name); |
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if (count($parts) > 1) { |
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$country = $parts[0]; |
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$name = $parts[1]; |
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} |
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$name = explode('|', $name); |
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if ($country == 'W') { |
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return array('WMC' => $name[0], 'WAC' => $name[1], 'WAE' => $name[2]); |
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} elseif ($country == 'S' || count($name)==3) { |
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return array('WMC' => $name[0], 'SPC' => $name[1], 'SPE' => $name[2]); |
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} elseif ($country == 'N' || count($name)==2) { |
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return array('WMC' => $name[0], 'NIE' => $name[1]); |
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} else { |
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return array('WMC' => $name[0]); |
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} |
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} |
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} |
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/** |
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* Fetch Postcode Information from MapIt |
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* |
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* @param string $postcode |
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*/ |
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private static function postcodeFetchFromMapit($postcode) { |
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if (!defined('OPTION_MAPIT_URL') || !OPTION_MAPIT_URL) { |
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return ''; |
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} |
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$filename = 'postcode/' . rawurlencode($postcode); |
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$ch = curl_init(OPTION_MAPIT_URL . $filename); |
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); |
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curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20); |
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curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); |
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curl_setopt($ch, CURLOPT_TIMEOUT, 10); |
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$file = curl_exec($ch); |
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if (curl_errno($ch)) { |
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$errno = curl_errno($ch); |
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trigger_error("Postcode database: " . $errno . ' ' . curl_error($ch), E_USER_WARNING); |
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return 'CONNECTION_TIMED_OUT'; |
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} |
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curl_close($ch); |
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$r = json_decode($file, true); |
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if (!$r) { |
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trigger_error("Postcode database is not working. Content:\n".$file.", request: ". $filename, E_USER_WARNING); |
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return ''; |
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} |
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if (isset($r['error']) || !isset($r['areas'])) { |
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return ''; |
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} |
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$areas = array(); |
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foreach ($r['areas'] as $row) { |
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if (in_array($row['type'], array('WMC', 'SPC', 'SPE', 'NIE', 'WAC', 'WAE'))) |
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$areas[$row['type']] = $row['name']; |
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} |
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if (!isset($areas['WMC'])) { |
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return ''; |
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} |
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# Normalise name - assume SP and NI are already so... |
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$normalised = Constituencies::normaliseConstituencyName(strtolower($areas['WMC'])); |
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if ($normalised) { |
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$areas['WMC'] = $normalised; |
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if (isset($areas['SPC'])) { |
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$serialized = "S;$areas[WMC]|$areas[SPC]|$areas[SPE]"; |
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} elseif (isset($areas['NIE'])) { |
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$serialized = "N;$areas[WMC]|$areas[NIE]"; |
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} elseif (isset($areas['WAC'])) { |
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$serialized = "W;$areas[WMC]|$areas[WAC]|$areas[WAE]"; |
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} else { |
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$serialized = "E;$areas[WMC]"; |
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} |
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$db = new \ParlDB; |
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$db->query('replace into postcode_lookup values(:postcode, :serialized)', |
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array( |
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':postcode' => $postcode, |
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':serialized' => $serialized |
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)); |
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} else { |
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return ''; |
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} |
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return $areas; |
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} |
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/** |
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* Canonicalise Postcode |
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* |
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* Take a postcode and turn it into a tidied, uppercased canonical version. |
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*/ |
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public static function canonicalisePostcode($pc) { |
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$pc = str_replace(' ', '', $pc); |
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$pc = trim($pc); |
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$pc = strtoupper($pc); |
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$pc = preg_replace('#(\d[A-Z]{2})#', ' $1', $pc); |
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return $pc; |
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} |
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} |
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mysociety /
theyworkforyou
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