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DEV: implemented service class IpAddressAnonymizer and implemented th…
…e anonymization of ip addresses in active surveys if necessary
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| <?php | ||
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| namespace LimeSurvey\Models\Services; | ||
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| /** | ||
| * This class offers a function to anonymize ip addresses. | ||
| * | ||
| * Class IpAddressAnonymizer | ||
| * @package LimeSurvey\Models\Services | ||
| */ | ||
| class IpAddressAnonymizer | ||
| { | ||
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| /** @var string the original ip address*/ | ||
| private $ipAddress; | ||
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| /** | ||
| * IpAddressAnonymizer constructor. | ||
| * | ||
| * @param $ipAddress | ||
| */ | ||
| public function __construct($ipAddress) | ||
| { | ||
| $this->ipAddress = $ipAddress; | ||
| } | ||
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| /** | ||
| * Checks if ip is a valid ipv4 | ||
| * | ||
| * @return mixed | ||
| */ | ||
| public function isIpv4(){ | ||
| return filter_var($this->ipAddress,FILTER_VALIDATE_IP,FILTER_FLAG_IPV4); | ||
| } | ||
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| /** | ||
| * Checks if ip is a valid ipv6 | ||
| * | ||
| * @return mixed|boolean false if not valid, otherwise the filtered ip address | ||
| */ | ||
| public function isIpv6(){ | ||
| return filter_var($this->ipAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6); | ||
| } | ||
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| /** | ||
| * Checks if ip is a valid ipAddress | ||
| * | ||
| * @return bool | ||
| */ | ||
| public function isValidIp(){ | ||
| return $this->isIpv4() || $this->isIpv6(); | ||
| } | ||
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| /** | ||
| * Anonymizes ip address: | ||
| * | ||
| * For instance, the IPv4 address 192.168.178.123 is anonymized to 192.168.178.0. | ||
| * The IPv6 address 2a03:2880:2117:df07:face:b00c:5:1 is anonymized to 2a03:2880:2117:0:0:0:0:0 | ||
| * It also checks before anonymizes if it has already been anonymized and in that case give back | ||
| * the ip address without changing it. | ||
| * | ||
| * @return string|boolean if ip is not anonymized false will be returned (in case of not a valid ip or ip has already been | ||
| * anonymized), else the anonymize ip will be returned as a string | ||
| */ | ||
| public function anonymizeIpAddress(){ | ||
| $anonymizedIp = false; | ||
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| if($this->isIpv4()){ //check if it is valid ipv4 | ||
| $ipArray = explode('.', $this->ipAddress); | ||
| $last_digit = array_pop($ipArray); | ||
| if($last_digit!=0){ //check if it has already been anonymized | ||
| //set last number to 0 | ||
| $anonymizedIp = implode('.',$ipArray); //without last digit ?!? | ||
| $anonymizedIp .= '.0'; | ||
| } | ||
| } elseif ($this->isIpv6()) { //check if it is valid ipv6 | ||
| $ipArray = explode(':', $this->ipAddress); | ||
| //the last 5 blocks have to be set to 0 ... | ||
| for ($i = 0; $i < 5; $i++) { | ||
| array_pop($ipArray); | ||
| } | ||
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| $anonymizedIp = implode(':', $ipArray); | ||
| //append last 5 blocks with 0 | ||
| for ($i = 0; $i < 5; $i++) { | ||
| $anonymizedIp .= ':0'; | ||
| } | ||
| } | ||
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| return $anonymizedIp; | ||
| } | ||
| } |
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