Cannot parse key claim as jwk.Key about jwx HOT 4 CLOSED

I'm guessing your question is

• RegisterCustomField is what you think should work, but
• since it requires a concrete type, it doesn't work on the interface type jwk.Key
• So how should I go about parsing it?

This is sort of an escape hatch, but I think I would do (untested, but I think it should work):

package myapp

type EmbeddedKey struct {
  Key jwk.Key
}

func (k *EmbeddedKey) UnmarshalJSON(data []byte) error {
  parsed, err := jwk.ParseKey(data)
  if err != nil { return err }
  
  k.Key = parsed
  return nil
}

// elsewhere...
jwt.RegisterCustomField(`key`, EmbeddedKey{})

tok, err := jwt.Parse(...)
k, _ := tok.Get(`key`)
// use k.Key

(this is mainly a note for my future self): For when/if there's v3, I think it would be prudent to allow RegisterCustomField to accept a constructor/parser, if that's possible.

from jwx.

RegisterCustomField accepting a parser would be great and solve my issue!

Also thanks for coming up with this workaround. Using the wrapper type for unmarshalling works great!

from jwx.

This issue is stale because it has been open 14 days with no activity. Remove stale label or comment or this will be closed in 7 days.

from jwx.

This issue was closed because it has been stalled for 7 days with no activity. This does not mean your issue is rejected, but rather it is done to hide it from the view of the maintains for the time being. Feel free to reopen if you have new comments

from jwx.