lemmy/server/src/apub/signatures.rs

// For this example, we'll use the Extensible trait, the Extension trait, the Actor trait, and
// the Person type
use activitystreams::{actor::Actor, ext::Extension};
use serde::{Deserialize, Serialize};

// The following is taken from here:
// https://docs.rs/activitystreams/0.5.0-alpha.17/activitystreams/ext/index.html

#[derive(Clone, Debug, Default, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct PublicKey {
  pub id: String,
  pub owner: String,
  pub public_key_pem: String,
}

#[derive(Clone, Debug, Default, Deserialize, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct PublicKeyExtension {
  pub public_key: PublicKey,
}

impl PublicKey {
  pub fn to_ext(&self) -> PublicKeyExtension {
    PublicKeyExtension {
      public_key: self.to_owned(),
    }
  }
}

impl<T> Extension<T> for PublicKeyExtension where T: Actor {}