Cloudflare DNS as DynDNS Provider

[EV21]

It seems pretty easy

We need

• Zone-ID or the Zone-Domain
  You can find it somewhere at Dashboard > Website > example.com
  In theory we can automatically get that with
  curl -X GET "https://api.cloudflare.com/client/v4/zones?name=example.com
  but that does not work with a subdomain
  curl -X GET "https://api.cloudflare.com/client/v4/zones?name=dyndns.example.com ⚡
  Cloudflare does not allow to have Subdomain-Zones so we also need the Zone-ID or Zone-Domain (simpler) as an additional parameter if there is no easy way of doing a workaround like we have it with the DomRobot API from INWX.
• API-Token
  Permissions: Zone.DNS edit
  Zone Resources: at least the specific zone for example.com
• Domain
  This is only needed if it is a subdomain like dyndns.example.com and it is not identical to the Zone-Domain

With this information we can automatically get the Domain-Record-ID from the API and finally update the record

requests:

• GET "https://api.cloudflare.com/client/v4/zones?name=example.com"
• GET "https://api.cloudflare.com/client/v4/zones/<zone-id>/dns_records?name=dyndns.example.com"
• PUT "https://api.cloudflare.com/client/v4/zones/<zone-id>/dns_records/<domain-record-id>"
  with data: {"type":"A","name":"dyndns.example.com","content":"127.0.0.1","ttl":60}
  in case someone wants to use the cloudflare network we also need to set "proxied":true (default is false)

This feature may require some renaming (refactoring) for the INWX Domrobot part to keep the code clean and manageable.