Anonymise logs

[lukeyouell]

Due to GDPR it would be really handy if we were able to anonymise the log prefixes.

This PR allows for log anonymisation to be enabled from the general config file.

[brandonkelly]

@lukeyouell you mainly just don't want the IP in there right?

[lukeyouell]

That's correct, but the simplest solution would be to remove the user & session ID's too.

I can alter the code to keep these if you'd prefer?

[brandonkelly]

Thinking we will just override getMessagePrefix() and strip out the IP. Doubt anyone is relying on that.

[lukeyouell]

We've used the IP address for debugging webhooks in the past so I do think there's a place for it in development environments.

[brandonkelly]

Took it in a slightly different direction, because I’d rather avoid creating a new config setting for this. So now craft\log\FileTarget has a new $includeUserIp property, which is false by default.

If you really need to show IP addresses for debugging purposes or whatever, you can enable it from config/app.php:

return [
    'components' => [
        'log' => function() {
            $config = craft\helpers\App::logConfig();
            if ($config) {
                $config['targets'][0]['includeUserIp'] = true;
                return Craft::createObject($config);
            }
            return null;
        },
    ],
];

[lukeyouell]

Sounds good to me! Cheers Brandon.