Validate dapps accounts with address book (#4407)

* Parametrize address book

* Improving types in account_provider

* Filtering dapps_accounts

* Fixing RPC tests

ethstore/src/ethstore.rs

@@ -16,6 +16,7 @@
 
 use std::collections::{BTreeMap, HashMap};
 use std::mem;
+use std::path::PathBuf;
 use parking_lot::{Mutex, RwLock};
 
 use crypto::KEY_ITERATIONS;
@@ -164,8 +165,8 @@ impl SecretStore for EthStore {
 		self.store.update(account_ref, old, safe_account)
 	}
 
-	fn local_path(&self) -> String {
-		self.store.dir.path().map(|p| p.to_string_lossy().into_owned()).unwrap_or_else(|| String::new())
+	fn local_path(&self) -> PathBuf {
+		self.store.dir.path().cloned().unwrap_or_else(PathBuf::new)
 	}
 
 	fn list_geth_accounts(&self, testnet: bool) -> Vec<Address> {

ethstore/src/secret_store.rs

@@ -15,6 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use std::hash::{Hash, Hasher};
+use std::path::PathBuf;
 use ethkey::{Address, Message, Signature, Secret, Public};
 use Error;
 use json::Uuid;
@@ -73,7 +74,7 @@ pub trait SecretStore: SimpleSecretStore {
 	fn set_name(&self, account: &StoreAccountRef, name: String) -> Result<(), Error>;
 	fn set_meta(&self, account: &StoreAccountRef, meta: String) -> Result<(), Error>;
 
-	fn local_path(&self) -> String;
+	fn local_path(&self) -> PathBuf;
 	fn list_geth_accounts(&self, testnet: bool) -> Vec<Address>;
 	fn import_geth_accounts(&self, vault: SecretVaultRef, desired: Vec<Address>, testnet: bool) -> Result<Vec<StoreAccountRef>, Error>;
 }