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use std::{any::type_name, collections::HashMap, ops::Deref};
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use anyhow::Error;
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use futures_util::Future;
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use jsonwebtoken::{decode, Algorithm, DecodingKey, TokenData, Validation};
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use serde::{de::DeserializeOwned, Deserialize, Serialize};
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use serde_json::Value;
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use crate::{authentication::UserTokenMetadata, connection::wrapper::ConnectionState};
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use super::{instance::Instance, user::User};
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#[derive(Debug, Hash, PartialEq, Eq, Serialize, Deserialize)]
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pub struct Authenticated<T: Serialize> {
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#[serde(flatten)]
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source: Vec<AuthenticationSource>,
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message_type: String,
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#[serde(flatten)]
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message: T,
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}
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pub trait AuthenticationSourceProvider: Sized {
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fn authenticate(self, payload: &Vec<u8>) -> AuthenticationSource;
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}
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pub trait AuthenticationSourceProviders: Sized {
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fn authenticate_all(self, payload: &Vec<u8>) -> Vec<AuthenticationSource>;
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}
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impl<A> AuthenticationSourceProviders for A
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where
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A: AuthenticationSourceProvider,
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{
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fn authenticate_all(self, payload: &Vec<u8>) -> Vec<AuthenticationSource> {
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vec![self.authenticate(payload)]
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}
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}
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impl<A, B> AuthenticationSourceProviders for (A, B)
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where
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A: AuthenticationSourceProvider,
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B: AuthenticationSourceProvider,
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{
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fn authenticate_all(self, payload: &Vec<u8>) -> Vec<AuthenticationSource> {
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let (first, second) = self;
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vec![first.authenticate(payload), second.authenticate(payload)]
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}
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}
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impl<T: Serialize> Authenticated<T> {
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pub fn new(message: T, auth_sources: impl AuthenticationSourceProvider) -> Self {
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let message_payload = serde_json::to_vec(&message).unwrap();
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let authentication = auth_sources.authenticate_all(&message_payload);
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Self {
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source: authentication,
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message_type: type_name::<T>().to_string(),
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message,
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}
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}
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pub fn new_empty(message: T) -> Self {
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Self {
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source: vec![],
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message_type: type_name::<T>().to_string(),
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message,
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}
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}
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pub fn append_authentication(&mut self, authentication: impl AuthenticationSourceProvider) {
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let message_payload = serde_json::to_vec(&self.message).unwrap();
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self.source
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.push(authentication.authenticate(&message_payload));
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}
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}
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mod verified {}
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#[derive(Clone, Debug)]
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pub struct UserAuthenticator {
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pub user: User,
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pub token: UserAuthenticationToken,
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}
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impl AuthenticationSourceProvider for UserAuthenticator {
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fn authenticate(self, _payload: &Vec<u8>) -> AuthenticationSource {
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AuthenticationSource::User {
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user: self.user,
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token: self.token,
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}
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}
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}
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#[derive(Clone)]
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pub struct InstanceAuthenticator<'a> {
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pub instance: Instance,
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pub private_key: &'a str,
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}
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impl AuthenticationSourceProvider for InstanceAuthenticator<'_> {
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fn authenticate(self, _payload: &Vec<u8>) -> AuthenticationSource {
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todo!()
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}
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}
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#[repr(transparent)]
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#[derive(Clone, Debug, Hash, PartialEq, Eq, Serialize, Deserialize)]
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pub struct UserAuthenticationToken(String);
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impl From<String> for UserAuthenticationToken {
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fn from(value: String) -> Self {
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Self(value)
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}
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}
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impl ToString for UserAuthenticationToken {
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fn to_string(&self) -> String {
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self.0.clone()
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}
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}
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impl AsRef<str> for UserAuthenticationToken {
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fn as_ref(&self) -> &str {
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&self.0
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}
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}
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#[derive(Clone, Debug, Hash, PartialEq, Eq, Serialize, Deserialize)]
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pub struct InstanceSignature(Vec<u8>);
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#[derive(Clone, Debug, Hash, PartialEq, Eq, Serialize, Deserialize)]
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pub enum AuthenticationSource {
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User {
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user: User,
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token: UserAuthenticationToken,
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},
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Instance {
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instance: Instance,
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signature: InstanceSignature,
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},
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}
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pub struct NetworkMessage(pub Vec<u8>);
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impl Deref for NetworkMessage {
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type Target = [u8];
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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pub struct AuthenticatedUser(pub User);
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#[derive(Debug, thiserror::Error)]
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pub enum UserAuthenticationError {
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#[error("user authentication missing")]
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Missing,
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#[error("user token was invalid")]
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InvalidToken,
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#[error("an error has occured")]
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Other(#[from] Error),
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}
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pub struct AuthenticatedInstance(Instance);
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impl AuthenticatedInstance {
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pub fn inner(&self) -> &Instance {
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&self.0
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}
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}
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#[async_trait::async_trait]
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pub trait FromMessage<S: Send + Sync>: Sized + Send + Sync {
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async fn from_message(message: &NetworkMessage, state: &S) -> Result<Self, Error>;
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}
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#[async_trait::async_trait]
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impl FromMessage<ConnectionState> for AuthenticatedUser {
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async fn from_message(
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network_message: &NetworkMessage,
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state: &ConnectionState,
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) -> Result<Self, Error> {
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let message: Authenticated<HashMap<String, Value>> =
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serde_json::from_slice(&network_message).map_err(|e| Error::from(e))?;
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let (auth_user, auth_token) = message
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.source
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.iter()
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.filter_map(|auth| {
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if let AuthenticationSource::User { user, token } = auth {
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Some((user, token))
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} else {
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None
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}
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})
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.next()
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.ok_or_else(|| UserAuthenticationError::Missing)?;
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let authenticated_instance =
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AuthenticatedInstance::from_message(network_message, state).await?;
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let public_key_raw = public_key(&auth_user.instance).await?;
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let verification_key = DecodingKey::from_rsa_pem(public_key_raw.as_bytes()).unwrap();
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let data: TokenData<UserTokenMetadata> = decode(
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auth_token.as_ref(),
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&verification_key,
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&Validation::new(Algorithm::RS256),
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)
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.unwrap();
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if data.claims.user != *auth_user
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|| data.claims.generated_for != *authenticated_instance.inner()
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{
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Err(Error::from(UserAuthenticationError::InvalidToken))
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} else {
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Ok(AuthenticatedUser(data.claims.user))
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}
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}
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}
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#[async_trait::async_trait]
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impl FromMessage<ConnectionState> for AuthenticatedInstance {
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async fn from_message(
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_message: &NetworkMessage,
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_state: &ConnectionState,
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) -> Result<Self, Error> {
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todo!()
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}
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}
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#[async_trait::async_trait]
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impl<S, T> FromMessage<S> for Option<T>
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where
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T: FromMessage<S>,
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S: Send + Sync + 'static,
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{
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async fn from_message(message: &NetworkMessage, state: &S) -> Result<Self, Error> {
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Ok(T::from_message(message, state).await.ok())
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}
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}
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#[async_trait::async_trait]
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pub trait MessageHandler<T, S, R> {
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async fn handle_message(self, message: &NetworkMessage, state: &S) -> Result<R, Error>;
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}
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#[async_trait::async_trait]
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impl<F, R, S, T1, T, E> MessageHandler<(T1,), S, R> for T
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where
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T: FnOnce(T1) -> F + Clone + Send + 'static,
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F: Future<Output = Result<R, E>> + Send,
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T1: FromMessage<S> + Send,
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S: Send + Sync,
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E: std::error::Error + Send + Sync + 'static,
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{
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async fn handle_message(self, message: &NetworkMessage, state: &S) -> Result<R, Error> {
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let value = T1::from_message(message, state).await?;
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self(value).await.map_err(|e| Error::from(e))
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}
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}
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#[async_trait::async_trait]
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impl<F, R, S, T1, T2, T, E> MessageHandler<(T1, T2), S, R> for T
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where
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T: FnOnce(T1, T2) -> F + Clone + Send + 'static,
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F: Future<Output = Result<R, E>> + Send,
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T1: FromMessage<S> + Send,
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T2: FromMessage<S> + Send,
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S: Send + Sync,
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E: std::error::Error + Send + Sync + 'static,
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{
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async fn handle_message(self, message: &NetworkMessage, state: &S) -> Result<R, Error> {
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let value = T1::from_message(message, state).await?;
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let value_2 = T2::from_message(message, state).await?;
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self(value, value_2).await.map_err(|e| Error::from(e))
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}
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}
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#[async_trait::async_trait]
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impl<F, R, S, T1, T2, T3, T, E> MessageHandler<(T1, T2, T3), S, R> for T
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where
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T: FnOnce(T1, T2, T3) -> F + Clone + Send + 'static,
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F: Future<Output = Result<R, E>> + Send,
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T1: FromMessage<S> + Send,
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T2: FromMessage<S> + Send,
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T3: FromMessage<S> + Send,
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S: Send + Sync,
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E: std::error::Error + Send + Sync + 'static,
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{
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async fn handle_message(self, message: &NetworkMessage, state: &S) -> Result<R, Error> {
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let value = T1::from_message(message, state).await?;
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let value_2 = T2::from_message(message, state).await?;
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let value_3 = T3::from_message(message, state).await?;
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self(value, value_2, value_3)
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.await
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.map_err(|e| Error::from(e))
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}
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}
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pub struct State<T>(pub T);
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#[async_trait::async_trait]
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impl<T> FromMessage<T> for State<T>
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where
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T: Clone + Send + Sync,
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{
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async fn from_message(_: &NetworkMessage, state: &T) -> Result<Self, Error> {
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Ok(Self(state.clone()))
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}
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}
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#[async_trait::async_trait]
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impl<T, S> FromMessage<S> for Message<T>
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where
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T: DeserializeOwned + Send + Sync + Serialize,
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S: Clone + Send + Sync,
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{
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async fn from_message(message: &NetworkMessage, _: &S) -> Result<Self, Error> {
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Ok(Message(serde_json::from_slice(&message)?))
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}
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}
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pub struct Message<T: Serialize + DeserializeOwned>(pub T);
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async fn public_key(instance: &Instance) -> Result<String, Error> {
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let key = reqwest::get(format!("https://{}/.giterated/pubkey.pem", instance.url))
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.await?
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.text()
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.await?;
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Ok(key)
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}
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|