Signer RPC method to check if signer is enabled (#1238)

* API to check if signer is enabled

* Fixing compilation warnings

parity/rpc_apis.rs

@@ -147,7 +147,7 @@ pub fn setup_rpc<T: Extendable>(server: T, deps: Arc<Dependencies>, apis: ApiSet
 				}
 			},
 			Api::Personal => {
-				server.add_delegate(PersonalClient::new(&deps.secret_store, &deps.client, &deps.miner).to_delegate());
+				server.add_delegate(PersonalClient::new(&deps.secret_store, &deps.client, &deps.miner, deps.signer_enabled).to_delegate());
 				if deps.signer_enabled {
 					server.add_delegate(SignerClient::new(&deps.secret_store, &deps.client, &deps.miner, &deps.signer_queue).to_delegate());
 				}

rpc/src/v1/impls/personal.rs

@@ -31,22 +31,29 @@ pub struct PersonalClient<A, C, M>
 	accounts: Weak<A>,
 	client: Weak<C>,
 	miner: Weak<M>,
+	signer_enabled: bool,
 }
 
 impl<A, C, M> PersonalClient<A, C, M>
 	where A: AccountProvider, C: MiningBlockChainClient, M: MinerService {
 	/// Creates new PersonalClient
-	pub fn new(store: &Arc<A>, client: &Arc<C>, miner: &Arc<M>) -> Self {
+	pub fn new(store: &Arc<A>, client: &Arc<C>, miner: &Arc<M>, signer_enabled: bool) -> Self {
 		PersonalClient {
 			accounts: Arc::downgrade(store),
 			client: Arc::downgrade(client),
 			miner: Arc::downgrade(miner),
+			signer_enabled: signer_enabled,
 		}
 	}
 }
 
 impl<A: 'static, C: 'static, M: 'static> Personal for PersonalClient<A, C, M>
 	where A: AccountProvider, C: MiningBlockChainClient, M: MinerService {
+
+	fn signer_enabled(&self, _: Params) -> Result<Value, Error> {
+		to_value(&self.signer_enabled)
+	}
+
 	fn accounts(&self, _: Params) -> Result<Value, Error> {
 		let store = take_weak!(self.accounts);
 		match store.accounts() {

rpc/src/v1/impls/traces.rs

@@ -19,7 +19,7 @@
 use std::sync::{Weak, Arc};
 use jsonrpc_core::*;
 use std::collections::BTreeMap;
-use util::{H256, U256, Uint};
+use util::H256;
 use ethcore::client::{BlockChainClient, CallAnalytics, TransactionID, TraceId};
 use ethcore::miner::MinerService;
 use ethcore::transaction::{Transaction as EthTransaction, SignedTransaction, Action};

rpc/src/v1/tests/mocked/personal.rs

@@ -53,7 +53,7 @@ fn setup() -> PersonalTester {
 	let accounts = accounts_provider();
 	let client = blockchain_client();
 	let miner = miner_service();
-	let personal = PersonalClient::new(&accounts, &client, &miner);
+	let personal = PersonalClient::new(&accounts, &client, &miner, false);
 
 	let io = IoHandler::new();
 	io.add_delegate(personal.to_delegate());
@@ -68,6 +68,20 @@ fn setup() -> PersonalTester {
 	tester
 }
 
+#[test]
+fn should_return_false_if_signer_is_disabled() {
+	// given
+	let tester = setup();
+
+	// when
+	let request = r#"{"jsonrpc": "2.0", "method": "personal_signerEnabled", "params": [], "id": 1}"#;
+	let response = r#"{"jsonrpc":"2.0","result":false,"id":1}"#;
+
+
+	// then
+	assert_eq!(tester.io.handle_request(request), Some(response.to_owned()));
+}
+
 #[test]
 fn accounts() {
 	let tester = setup();

rpc/src/v1/traits/personal.rs

@@ -33,9 +33,13 @@ pub trait Personal: Sized + Send + Sync + 'static {
 	/// Sends transaction and signs it in single call. The account is not unlocked in such case.
 	fn sign_and_send_transaction(&self, _: Params) -> Result<Value, Error>;
 
+	/// Returns `true` if Trusted Signer is enabled, `false` otherwise.
+	fn signer_enabled(&self, _: Params) -> Result<Value, Error>;
+
 	/// Should be used to convert object to io delegate.
 	fn to_delegate(self) -> IoDelegate<Self> {
 		let mut delegate = IoDelegate::new(Arc::new(self));
+		delegate.add_method("personal_signerEnabled", Personal::signer_enabled);
 		delegate.add_method("personal_listAccounts", Personal::accounts);
 		delegate.add_method("personal_newAccount", Personal::new_account);
 		delegate.add_method("personal_unlockAccount", Personal::unlock_account);