# Cache Registration

Cache registration is the process that is typically necessary
for Apple devices to use the cache.

Unfortunately, the request that registers the cache seems to be "signed".

I did however figure out that the length of the signed payload is a Big Endian 32-bit integer before the payload. Still working out the signature format.

```text
Registration URL: https://lcdn-registration.apple.com/lcdn/register
```

The un-signed request content looks like:

```json
{
  "push-token": "fbFqxPukE8hfZD+Lbeo+E6390ih2lmY0I13apvLhZ6I=",
  "ranked-peers": true,
  "details": {
    "capabilities": {
      "ur": true,
      "sc": true,
      "pc": true,
      "im": true,
      "ns": true,
      "query-parameters": true
    },
    "cache-size": 230000000000,
    "ac-power": true,
    "is-portable": true,
    "local-network": [
      {
        "speed": 1300,
        "wired": false
      }
    ]
  },
  "local-ranges-only": true,
  "local-ranges": [
    {
      "first": "10.0.0.0",
      "last": "10.0.255.255"
    }
  ],
  "cache-software": [
    {
      "type": "cache",
      "name": "Caching Server",
      "version": "233"
    },
    {
      "build": "19A583",
      "type": "system",
      "name": "Mac OS X",
      "version": "10.15"
    }
  ],
  "guid": "A14862D9-9643-4F18-B0BA-990BC2CAC0C2",
  "local-addresses": [
    {
      "address": "10.0.0.20",
      "netmask": "255.255.0.0",
      "port": "51391"
    }
  ],
  "session-token": "1570938452471~46E0EE91164ABF1E4D42F7C3DC51B0747AD1BC3E7C9073CB6230D8F2191C40D9"
}
```