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# Cloudflare PHP IP Rewriting
This module makes it easy for developers to add rewrite Cloudflare IP Addresses for actual end-user IP Addresses at the application layer. It is recommended to either install mod_cloudflare for Apache or use nginx rewrite rules (<https://support.cloudflare.com/hc/en-us/articles/200170706-Does-CloudFlare-have-an-IP-module-for-Nginx->) if possible.
For those cases, where the IP can not be guaranteed to be rewritten by one of these alternate means, this module can be used to rewrite the IP address.
### How it works
```php
$ipRewrite = new CloudFlare\IpRewrite();
$is_cf = $ipRewrite->isCloudFlare();
$rewritten_ip = $ipRewrite->getRewrittenIP();
$original_ip = $ipRewrite->getOriginalIP();
```
The class exposes three methods for interaction and a constructor.
Initializing `IpRewrite()` object will try to rewrite the IP. If the IP is rewritten, `$_SERVER["REMOTE_ADDR"]` will be updated to reflect the end-user's IP address.
`isCloudFlare();` returns `true` if the `CF_CONNECTING_IP` header is present in the request and the request originates from a Cloudflare IP.
`getRewrittenIP()` Returns the rewritten ip address if a rewrite occurs, otherwise it will return `null`.
`getOriginalIP()` returns the saved original ip address from `$_SERVER["REMOTE_ADDR"]`.
### Best Pratice
```php
// Initialize object to rewrite the headers
try {
$ipRewrite = new CloudFlare\IpRewrite();
} catch (RuntimeException $e) {
// PHP configurations does not support IPv6
}
// Check if the request is from Cloudflare
$is_cf = $ipRewrite->isCloudFlare();
if ($is_cf) {
// Get original or rewritten ip
// Order does not matter
...
$rewritten_ip = $ipRewrite->getRewrittenIP();
...
$original_ip = $ipRewrite->getOriginalIP();
...
}
```
#### Caution
Rewrite action is triggered only once in constructor. If `getRewrittenIP()` or `getOriginalIP()` is called multiple times it'll return the first result regardless if a change happened after the first call. Since rewrite action was not triggered.
To get the newest changes a new `IpRewrite` object should be used.
### Testing this module
This module comes with a set of tests that can be run using phpunit. To run the tests, run `composer install` on the package and then one of the following commands:
#### Basic Tests
composer test
#### With code coverage report in `coverage` folder
vendor/bin/phpunit -c phpunit.xml.dist --coverage-html coverage