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use serde::{Serialize, Deserialize};
use crate::{AuthLink, AuthChain};
use crate::account::{Account, Expiration, Signer, EphemeralPayload, PersonalSignature};
/// An `Identity` is an abstraction where an Account that you don't control delegates the
/// ability to sign messages to a new address (encapsulated in the `Identity`) for a limited
/// amount of time using a signature.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct Identity {
ephemeral_identity: Account,
expiration: Expiration,
auth_chain: Vec<AuthLink>,
}
/// Implements `Signer` trait for `Identity`
impl Signer for Identity {
/// Returns the address of the ephemeral identity
fn address(&self) -> crate::Address {
self.ephemeral_identity.address()
}
/// Signs the given message with the ephemeral identity
fn sign<M: AsRef<[u8]>>(&self, message: M) -> crate::account::PersonalSignature {
self.ephemeral_identity.sign(message)
}
}
impl Identity {
/// Creates a new Identity from the given JSON
///
/// ```rust
/// use dcl_crypto::Identity;
///
/// let identity = Identity::from_json(r#"{
/// "ephemeralIdentity": {
/// "address": "0x84452bbFA4ca14B7828e2F3BBd106A2bD495CD34",
/// "publicKey": "0x0420c548d960b06dac035d1daf826472eded46b8b9d123294f1199c56fa235c89f2515158b1e3be0874bfb15b42d1551db8c276787a654d0b8d7b4d4356e70fe42",
/// "privateKey": "0xbc453a92d9baeb3d10294cbc1d48ef6738f718fd31b4eb8085efe7b311299399"
/// },
/// "expiration": "3021-10-16T22:32:29.626Z",
/// "authChain": [
/// {
/// "type": "SIGNER",
/// "payload": "0x7949f9f239d1a0816ce5eb364a1f588ae9cc1bf5",
/// "signature": ""
/// },
/// {
/// "type": "ECDSA_EPHEMERAL",
/// "payload": "Decentraland Login\nEphemeral address: 0x84452bbFA4ca14B7828e2F3BBd106A2bD495CD34\nExpiration: 3021-10-16T22:32:29.626Z",
/// "signature": "0x39dd4ddf131ad2435d56c81c994c4417daef5cf5998258027ef8a1401470876a1365a6b79810dc0c4a2e9352befb63a9e4701d67b38007d83ffc4cd2b7a38ad51b"
/// }
/// ]
/// }"#);
///
/// assert!(identity.is_ok());
/// ```
pub fn from_json<J: AsRef<str>>(json: J) -> Result<Self, serde_json::Error> {
serde_json::from_str::<Identity>(json.as_ref())
}
/// Creates a new Identity from the given Signer
///
/// ```rust
/// use dcl_crypto::{Identity, Account, Signer, Expiration};
///
/// let signer = Account::random();
/// let identity = Identity::from_signer(&signer, Expiration::try_from("3021-10-16T22:32:29.626Z").unwrap());
/// let chain = identity.sign_payload("Hello World");
///
/// assert_eq!(chain.owner(), Some(&signer.address()));
/// assert_eq!(chain.len(), 3);
/// ```
pub fn from_signer<S: Signer, E: Into<Expiration>>(signer: &S, exp: E) -> Self {
let ephemeral_identity = Account::random();
let expiration = exp.into();
let payload = EphemeralPayload::new(ephemeral_identity.address(), expiration);
let signature = signer.sign(payload.to_string());
Self {
ephemeral_identity,
expiration,
auth_chain: vec![
AuthLink::signer(signer.address()),
AuthLink::EcdsaPersonalEphemeral{ payload, signature }
],
}
}
/// Creates a new Identity extended from a given Identity
///
/// ```rust
/// use dcl_crypto::{Identity, Account, Signer, Expiration};
///
/// let signer = Account::random();
/// let identity1 = Identity::from_signer(&signer, Expiration::try_from("3021-10-16T22:32:29.626Z").unwrap());
/// let identity2 = Identity::from_identity(&identity1, Expiration::try_from("3021-10-16T22:32:29.626Z").unwrap());
/// let chain = identity2.sign_payload("Hello World");
///
/// assert_eq!(chain.owner(), Some(&signer.address()));
/// assert_eq!(chain.len(), 4);
/// ```
pub fn from_identity<E: Into<Expiration>>(identity: &Identity, exp: E) -> Self {
let ephemeral_identity = Account::random();
let mut expiration = exp.into();
if identity.expiration < expiration {
expiration = identity.expiration;
}
let payload = EphemeralPayload::new(ephemeral_identity.address(), expiration);
let signature = identity.sign(payload.to_string());
let mut auth_chain: Vec<AuthLink> = identity.auth_chain.clone();
auth_chain.push(AuthLink::EcdsaPersonalEphemeral{ payload, signature });
Self {
ephemeral_identity,
expiration,
auth_chain
}
}
/// Creates a PersonalSignature for the given payload
///
/// ```rust
/// use dcl_crypto::Identity;
///
/// let identity = Identity::from_json(r#"{
/// "ephemeralIdentity": {
/// "address": "0x84452bbFA4ca14B7828e2F3BBd106A2bD495CD34",
/// "publicKey": "0x0420c548d960b06dac035d1daf826472eded46b8b9d123294f1199c56fa235c89f2515158b1e3be0874bfb15b42d1551db8c276787a654d0b8d7b4d4356e70fe42",
/// "privateKey": "0xbc453a92d9baeb3d10294cbc1d48ef6738f718fd31b4eb8085efe7b311299399"
/// },
/// "expiration": "3021-10-16T22:32:29.626Z",
/// "authChain": [
/// {
/// "type": "SIGNER",
/// "payload": "0x7949f9f239d1a0816ce5eb364a1f588ae9cc1bf5",
/// "signature": ""
/// },
/// {
/// "type": "ECDSA_EPHEMERAL",
/// "payload": "Decentraland Login\nEphemeral address: 0x84452bbFA4ca14B7828e2F3BBd106A2bD495CD34\nExpiration: 3021-10-16T22:32:29.626Z",
/// "signature": "0x39dd4ddf131ad2435d56c81c994c4417daef5cf5998258027ef8a1401470876a1365a6b79810dc0c4a2e9352befb63a9e4701d67b38007d83ffc4cd2b7a38ad51b"
/// }
/// ]
/// }"#).unwrap();
///
/// assert_eq!(
/// identity.create_signature("Hello World!").to_string(),
/// "0x33e6b0f71b69d9dca7e25fa279cd70e2e9a44d0c11ab973a936a5b67ba3dbb6554ec2ea5cb4112b2f051dd95b47874c40b8bb7443a0bc4f16c67e2017e0dcb0c1c"
/// );
/// ```
pub fn create_signature<M: AsRef<str>>(&self, payload: M) -> PersonalSignature {
self.ephemeral_identity.sign(payload.as_ref())
}
/// Creates an AuthChain signing the the given payload
///
/// ```rust
/// use dcl_crypto::{Identity, Authenticator, Signer, Account, Expiration};
///
/// # tokio_test::block_on(async {
/// let signer = Account::random();
/// let identity = Identity::from_signer(&signer, Expiration::try_from("3021-10-16T22:32:29.626Z").unwrap());
/// let chain = identity.sign_payload("Hello World!");
/// let address = Authenticator::new().verify_signature(&chain, "Hello World!").await.unwrap();
/// assert_eq!(address, &signer.address());
/// })
/// ```
///
/// ```rust
/// use dcl_crypto::{Identity, Authenticator, Signer, AuthChain};
///
/// let identity = Identity::from_json(r#"{
/// "ephemeralIdentity": {
/// "address": "0x84452bbFA4ca14B7828e2F3BBd106A2bD495CD34",
/// "publicKey": "0x0420c548d960b06dac035d1daf826472eded46b8b9d123294f1199c56fa235c89f2515158b1e3be0874bfb15b42d1551db8c276787a654d0b8d7b4d4356e70fe42",
/// "privateKey": "0xbc453a92d9baeb3d10294cbc1d48ef6738f718fd31b4eb8085efe7b311299399"
/// },
/// "expiration": "3021-10-16T22:32:29.626Z",
/// "authChain": [
/// {
/// "type": "SIGNER",
/// "payload": "0x7949f9f239d1a0816ce5eb364a1f588ae9cc1bf5",
/// "signature": ""
/// },
/// {
/// "type": "ECDSA_EPHEMERAL",
/// "payload": "Decentraland Login\nEphemeral address: 0x84452bbFA4ca14B7828e2F3BBd106A2bD495CD34\nExpiration: 3021-10-16T22:32:29.626Z",
/// "signature": "0x39dd4ddf131ad2435d56c81c994c4417daef5cf5998258027ef8a1401470876a1365a6b79810dc0c4a2e9352befb63a9e4701d67b38007d83ffc4cd2b7a38ad51b"
/// }
/// ]
/// }"#).unwrap();
///
///
/// # tokio_test::block_on(async {
/// let chain = identity.sign_payload("Hello World!");
/// let address = Authenticator::new().verify_signature(&chain, "Hello World!").await.unwrap();
/// assert_eq!(identity.address().to_string(), "0x84452bbfa4ca14b7828e2f3bbd106a2bd495cd34");
/// assert_eq!(address.to_string(), "0x7949f9f239d1a0816ce5eb364a1f588ae9cc1bf5");
/// assert_eq!(
/// chain,
/// AuthChain::from_json(r#"[
/// {
/// "type": "SIGNER",
/// "payload": "0x7949f9f239d1a0816ce5eb364a1f588ae9cc1bf5",
/// "signature": ""
/// },
/// {
/// "type": "ECDSA_EPHEMERAL",
/// "payload": "Decentraland Login\nEphemeral address: 0x84452bbFA4ca14B7828e2F3BBd106A2bD495CD34\nExpiration: 3021-10-16T22:32:29.626Z",
/// "signature": "0x39dd4ddf131ad2435d56c81c994c4417daef5cf5998258027ef8a1401470876a1365a6b79810dc0c4a2e9352befb63a9e4701d67b38007d83ffc4cd2b7a38ad51b"
/// },
/// {
/// "type": "ECDSA_SIGNED_ENTITY",
/// "payload": "Hello World!",
/// "signature": "0x33e6b0f71b69d9dca7e25fa279cd70e2e9a44d0c11ab973a936a5b67ba3dbb6554ec2ea5cb4112b2f051dd95b47874c40b8bb7443a0bc4f16c67e2017e0dcb0c1c"
/// }
/// ]"#).unwrap()
/// );
/// })
/// ```
pub fn sign_payload<M: AsRef<str>>(&self, payload: M) -> AuthChain {
let entity = AuthLink::EcdsaPersonalSignedEntity {
payload: payload.as_ref().to_string(),
signature: self.create_signature(payload.as_ref())
};
let mut links = self.auth_chain.clone();
links.push(entity);
AuthChain::from(links)
}
}