Persistent tracking of dapps (#4302)

* Tests for RPC

* Extracting dapp_id from Origin and x-parity-origin

* Separate type for DappId

* Persistent tracking of recent dapps

* Fixing tests

* Exposing dapp timestamps

* Fixing import to work on stable

* Fixing test again

dapps/src/rpc.rs

@@ -57,12 +57,19 @@ impl Endpoint for RpcEndpoint {
 struct MetadataExtractor;
 impl HttpMetaExtractor<Metadata> for MetadataExtractor {
 	fn read_metadata(&self, request: &hyper::server::Request<hyper::net::HttpStream>) -> Metadata {
-		let dapp_id = request.headers().get::<hyper::header::Referer>()
-			.and_then(|referer| hyper::Url::parse(referer).ok())
-			.and_then(|url| {
-				url.path_segments()
-					.and_then(|mut split| split.next())
-					.map(|app_id| app_id.to_owned())
+		let dapp_id = request.headers().get::<hyper::header::Origin>()
+			.map(|origin| format!("{}://{}", origin.scheme, origin.host))
+			.or_else(|| {
+				// fallback to custom header, but only if origin is null
+				request.headers().get_raw("origin")
+					.and_then(|raw| raw.one())
+					.and_then(|raw| if raw == "null".as_bytes() {
+						request.headers().get_raw("x-parity-origin")
+							.and_then(|raw| raw.one())
+							.map(|raw| String::from_utf8_lossy(raw).into_owned())
+					} else {
+						None
+					})
 			});
 		Metadata {
 			dapp_id: dapp_id,

dapps/src/tests/helpers/mod.rs

@@ -19,6 +19,7 @@ use std::str;
 use std::ops::Deref;
 use std::sync::Arc;
 use env_logger::LogBuilder;
+use ethcore_rpc::Metadata;
 use jsonrpc_core::MetaIoHandler;
 use jsonrpc_core::reactor::RpcEventLoop;
 
@@ -58,7 +59,7 @@ impl Deref for ServerLoop {
 	}
 }
 
-pub fn init_server<F, B>(process: F, remote: Remote) -> (ServerLoop, Arc<FakeRegistrar>) where
+pub fn init_server<F, B>(process: F, io: MetaIoHandler<Metadata>, remote: Remote) -> (ServerLoop, Arc<FakeRegistrar>) where
 	F: FnOnce(ServerBuilder) -> ServerBuilder<B>,
 	B: Fetch,
 {
@@ -70,7 +71,7 @@ pub fn init_server<F, B>(process: F, remote: Remote) -> (ServerLoop, Arc<FakeReg
 	// TODO [ToDr] When https://github.com/ethcore/jsonrpc/issues/26 is resolved
 	// this additional EventLoop wouldn't be needed, we should be able to re-use remote.
 	let event_loop = RpcEventLoop::spawn();
-	let handler = event_loop.handler(Arc::new(MetaIoHandler::default()));
+	let handler = event_loop.handler(Arc::new(io));
 	let server = process(ServerBuilder::new(
 		&dapps_path, registrar.clone(), remote,
 	))
@@ -100,12 +101,16 @@ pub fn serve_with_auth(user: &str, pass: &str) -> ServerLoop {
 	}
 }
 
+pub fn serve_with_rpc(io: MetaIoHandler<Metadata>) -> ServerLoop {
+	init_server(|builder| builder.allowed_hosts(None), io, Remote::new_sync()).0
+}
+
 pub fn serve_hosts(hosts: Option<Vec<String>>) -> ServerLoop {
-	init_server(|builder| builder.allowed_hosts(hosts), Remote::new_sync()).0
+	init_server(|builder| builder.allowed_hosts(hosts), Default::default(), Remote::new_sync()).0
 }
 
 pub fn serve_with_registrar() -> (ServerLoop, Arc<FakeRegistrar>) {
-	init_server(|builder| builder.allowed_hosts(None), Remote::new_sync())
+	init_server(|builder| builder.allowed_hosts(None), Default::default(), Remote::new_sync())
 }
 
 pub fn serve_with_registrar_and_sync() -> (ServerLoop, Arc<FakeRegistrar>) {
@@ -113,7 +118,7 @@ pub fn serve_with_registrar_and_sync() -> (ServerLoop, Arc<FakeRegistrar>) {
 		builder
 			.sync_status(Arc::new(|| true))
 			.allowed_hosts(None)
-	}, Remote::new_sync())
+	}, Default::default(), Remote::new_sync())
 }
 
 pub fn serve_with_registrar_and_fetch() -> (ServerLoop, FakeFetch, Arc<FakeRegistrar>) {
@@ -125,7 +130,7 @@ pub fn serve_with_registrar_and_fetch_and_threads(multi_threaded: bool) -> (Serv
 	let f = fetch.clone();
 	let (server, reg) = init_server(move |builder| {
 		builder.allowed_hosts(None).fetch(f.clone())
-	}, if multi_threaded { Remote::new_thread_per_future() } else { Remote::new_sync() });
+	}, Default::default(), if multi_threaded { Remote::new_thread_per_future() } else { Remote::new_sync() });
 
 	(server, fetch, reg)
 }
@@ -138,13 +143,13 @@ pub fn serve_with_fetch(web_token: &'static str) -> (ServerLoop, FakeFetch) {
 			.allowed_hosts(None)
 			.fetch(f.clone())
 			.web_proxy_tokens(Arc::new(move |token| &token == web_token))
-	}, Remote::new_sync());
+	}, Default::default(), Remote::new_sync());
 
 	(server, fetch)
 }
 
 pub fn serve() -> ServerLoop {
-	init_server(|builder| builder.allowed_hosts(None), Remote::new_sync()).0
+	init_server(|builder| builder.allowed_hosts(None), Default::default(), Remote::new_sync()).0
 }
 
 pub fn request(server: ServerLoop, request: &str) -> http_client::Response {

dapps/src/tests/mod.rs

@@ -22,5 +22,6 @@ mod api;
 mod authorization;
 mod fetch;
 mod redirection;
+mod rpc;
 mod validation;
 

dapps/src/tests/rpc.rs

@@ -0,0 +1,119 @@
+// Copyright 2015-2017 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+use futures::{future, Future};
+use ethcore_rpc::{Metadata, Origin};
+use jsonrpc_core::{MetaIoHandler, Value};
+
+use tests::helpers::{serve_with_rpc, request};
+
+#[test]
+fn should_serve_rpc() {
+	// given
+	let mut io = MetaIoHandler::new();
+	io.add_method("rpc_test", |_| {
+		Ok(Value::String("Hello World!".into()))
+	});
+	let server = serve_with_rpc(io);
+
+	// when
+	let req = r#"{"jsonrpc":"2.0","id":1,"method":"rpc_test","params":[]}"#;
+	let response = request(server, &format!(
+		"\
+			POST /rpc/ HTTP/1.1\r\n\
+			Host: 127.0.0.1:8080\r\n\
+			Connection: close\r\n\
+			Content-Type: application/json\r\n\
+			Content-Length: {}\r\n\
+			\r\n\
+			{}\r\n\
+		",
+		req.as_bytes().len(),
+		req,
+	));
+
+	// then
+	response.assert_status("HTTP/1.1 200 OK");
+	assert_eq!(response.body, "31\n{\"jsonrpc\":\"2.0\",\"result\":\"Hello World!\",\"id\":1}\n\n0\n\n".to_owned());
+}
+
+#[test]
+fn should_extract_metadata() {
+	// given
+	let mut io = MetaIoHandler::new();
+	io.add_method_with_meta("rpc_test", |_params, meta: Metadata| {
+		assert_eq!(meta.dapp_id, Some("https://parity.io/".to_owned()));
+		assert_eq!(meta.origin, Origin::Dapps);
+		future::ok(Value::String("Hello World!".into())).boxed()
+	});
+	let server = serve_with_rpc(io);
+
+	// when
+	let req = r#"{"jsonrpc":"2.0","id":1,"method":"rpc_test","params":[]}"#;
+	let response = request(server, &format!(
+		"\
+			POST /rpc/ HTTP/1.1\r\n\
+			Host: 127.0.0.1:8080\r\n\
+			Connection: close\r\n\
+			Origin: https://parity.io/\r\n\
+			X-Parity-Origin: https://this.should.be.ignored\r\n\
+			Content-Type: application/json\r\n\
+			Content-Length: {}\r\n\
+			\r\n\
+			{}\r\n\
+		",
+		req.as_bytes().len(),
+		req,
+	));
+
+	// then
+	response.assert_status("HTTP/1.1 200 OK");
+	assert_eq!(response.body, "31\n{\"jsonrpc\":\"2.0\",\"result\":\"Hello World!\",\"id\":1}\n\n0\n\n".to_owned());
+}
+
+#[test]
+fn should_extract_metadata_from_custom_header() {
+	// given
+	let mut io = MetaIoHandler::new();
+	io.add_method_with_meta("rpc_test", |_params, meta: Metadata| {
+		assert_eq!(meta.dapp_id, Some("https://parity.io/".to_owned()));
+		assert_eq!(meta.origin, Origin::Dapps);
+		future::ok(Value::String("Hello World!".into())).boxed()
+	});
+	let server = serve_with_rpc(io);
+
+	// when
+	let req = r#"{"jsonrpc":"2.0","id":1,"method":"rpc_test","params":[]}"#;
+	let response = request(server, &format!(
+		"\
+			POST /rpc/ HTTP/1.1\r\n\
+			Host: 127.0.0.1:8080\r\n\
+			Connection: close\r\n\
+			Origin: null\r\n\
+			X-Parity-Origin: https://parity.io/\r\n\
+			Content-Type: application/json\r\n\
+			Content-Length: {}\r\n\
+			\r\n\
+			{}\r\n\
+		",
+		req.as_bytes().len(),
+		req,
+	));
+
+	// then
+	response.assert_status("HTTP/1.1 200 OK");
+	assert_eq!(response.body, "31\n{\"jsonrpc\":\"2.0\",\"result\":\"Hello World!\",\"id\":1}\n\n0\n\n".to_owned());
+}

ethcore/src/account_provider/mod.rs

@@ -74,7 +74,18 @@ impl From<SSError> for Error {
 }
 
 /// Dapp identifier
-pub type DappId = String;
+#[derive(Default, Debug, Clone, Eq, PartialEq, Hash, Ord, PartialOrd)]
+pub struct DappId(String);
+
+impl From<DappId> for String {
+	fn from(id: DappId) -> String { id.0 }
+}
+impl From<String> for DappId {
+	fn from(id: String) -> DappId { DappId(id) }
+}
+impl<'a> From<&'a str> for DappId {
+	fn from(id: &'a str) -> DappId { DappId(id.to_owned()) }
+}
 
 fn transient_sstore() -> EthMultiStore {
 	EthMultiStore::open(Box::new(MemoryDirectory::default())).expect("MemoryDirectory load always succeeds; qed")
@@ -181,7 +192,7 @@ impl AccountProvider {
 	}
 
 	/// Gets a list of dapps recently requesting accounts.
-	pub fn recent_dapps(&self) -> Result<Vec<DappId>, Error> {
+	pub fn recent_dapps(&self) -> Result<HashMap<DappId, u64>, Error> {
 		Ok(self.dapps_settings.read().recent_dapps())
 	}
 
@@ -405,7 +416,7 @@ impl AccountProvider {
 
 #[cfg(test)]
 mod tests {
-	use super::{AccountProvider, Unlock};
+	use super::{AccountProvider, Unlock, DappId};
 	use std::time::Instant;
 	use ethstore::ethkey::{Generator, Random};
 
@@ -466,7 +477,7 @@ mod tests {
 	fn should_set_dapps_addresses() {
 		// given
 		let ap = AccountProvider::transient_provider();
-		let app = "app1".to_owned();
+		let app = DappId("app1".into());
 		// set `AllAccounts` policy
 		ap.set_new_dapps_whitelist(None).unwrap();
 

ethcore/src/account_provider/stores.rs

@@ -17,11 +17,17 @@
 //! Address Book and Dapps Settings Store
 
 use std::{fs, fmt, hash, ops};
-use std::collections::{HashMap, VecDeque};
+use std::sync::atomic::{self, AtomicUsize};
+use std::collections::HashMap;
 use std::path::PathBuf;
 
 use ethstore::ethkey::Address;
-use ethjson::misc::{AccountMeta, DappsSettings as JsonSettings, NewDappsPolicy as JsonNewDappsPolicy};
+use ethjson::misc::{
+	AccountMeta,
+	DappsSettings as JsonSettings,
+	DappsHistory as JsonDappsHistory,
+	NewDappsPolicy as JsonNewDappsPolicy,
+};
 use account_provider::DappId;
 
 /// Disk-backed map from Address to String. Uses JSON.
@@ -35,7 +41,7 @@ impl AddressBook {
 		let mut r = AddressBook {
 			cache: DiskMap::new(path, "address_book.json".into())
 		};
-		r.cache.revert(AccountMeta::read_address_map);
+		r.cache.revert(AccountMeta::read);
 		r
 	}
 
@@ -52,7 +58,7 @@ impl AddressBook {
 	}
 
 	fn save(&self) {
-		self.cache.save(AccountMeta::write_address_map)
+		self.cache.save(AccountMeta::write)
 	}
 
 	/// Sets new name for given address.
@@ -134,7 +140,51 @@ impl From<NewDappsPolicy> for JsonNewDappsPolicy {
 	}
 }
 
-const MAX_RECENT_DAPPS: usize = 10;
+/// Transient dapps data
+#[derive(Default, Debug, Clone, Eq, PartialEq)]
+pub struct TransientDappsData {
+	/// Timestamp of last access
+	pub last_accessed: u64,
+}
+
+impl From<JsonDappsHistory> for TransientDappsData {
+	fn from(s: JsonDappsHistory) -> Self {
+		TransientDappsData {
+			last_accessed: s.last_accessed,
+		}
+	}
+}
+
+impl From<TransientDappsData> for JsonDappsHistory {
+	fn from(s: TransientDappsData) -> Self {
+		JsonDappsHistory {
+			last_accessed: s.last_accessed,
+		}
+	}
+}
+
+enum TimeProvider {
+	Clock,
+	Incremenetal(AtomicUsize)
+}
+
+impl TimeProvider {
+	fn get(&self) -> u64 {
+		match *self {
+			TimeProvider::Clock => {
+				::std::time::UNIX_EPOCH.elapsed()
+					.expect("Correct time is required to be set")
+					.as_secs()
+
+			},
+			TimeProvider::Incremenetal(ref time) => {
+				time.fetch_add(1, atomic::Ordering::SeqCst) as u64
+			},
+		}
+	}
+}
+
+const MAX_RECENT_DAPPS: usize = 50;
 
 /// Disk-backed map from DappId to Settings. Uses JSON.
 pub struct DappsSettingsStore {
@@ -142,8 +192,10 @@ pub struct DappsSettingsStore {
 	settings: DiskMap<DappId, DappsSettings>,
 	/// New Dapps Policy
 	policy: DiskMap<String, NewDappsPolicy>,
-	/// Recently Accessed Dapps (transient)
-	recent: VecDeque<DappId>,
+	/// Transient Data of recently Accessed Dapps
+	history: DiskMap<DappId, TransientDappsData>,
+	/// Time
+	time: TimeProvider,
 }
 
 impl DappsSettingsStore {
@@ -152,10 +204,12 @@ impl DappsSettingsStore {
 		let mut r = DappsSettingsStore {
 			settings: DiskMap::new(path.clone(), "dapps_accounts.json".into()),
 			policy: DiskMap::new(path.clone(), "dapps_policy.json".into()),
-			recent: VecDeque::with_capacity(MAX_RECENT_DAPPS),
+			history: DiskMap::new(path.clone(), "dapps_history.json".into()),
+			time: TimeProvider::Clock,
 		};
-		r.settings.revert(JsonSettings::read_dapps_settings);
-		r.policy.revert(JsonNewDappsPolicy::read_new_dapps_policy);
+		r.settings.revert(JsonSettings::read);
+		r.policy.revert(JsonNewDappsPolicy::read);
+		r.history.revert(JsonDappsHistory::read);
 		r
 	}
 
@@ -164,7 +218,8 @@ impl DappsSettingsStore {
 		DappsSettingsStore {
 			settings: DiskMap::transient(),
 			policy: DiskMap::transient(),
-			recent: VecDeque::with_capacity(MAX_RECENT_DAPPS),
+			history: DiskMap::transient(),
+			time: TimeProvider::Incremenetal(AtomicUsize::new(1)),
 		}
 	}
 
@@ -178,24 +233,36 @@ impl DappsSettingsStore {
 		self.policy.get("default").cloned().unwrap_or(NewDappsPolicy::AllAccounts)
 	}
 
-	/// Returns recent dapps (in order of last request)
-	pub fn recent_dapps(&self) -> Vec<DappId> {
-		self.recent.iter().cloned().collect()
+	/// Returns recent dapps with last accessed timestamp
+	pub fn recent_dapps(&self) -> HashMap<DappId, u64> {
+		self.history.iter().map(|(k, v)| (k.clone(), v.last_accessed)).collect()
 	}
 
 	/// Marks recent dapp as used
 	pub fn mark_dapp_used(&mut self, dapp: DappId) {
-		self.recent.retain(|id| id != &dapp);
-		self.recent.push_front(dapp);
-		while self.recent.len() > MAX_RECENT_DAPPS {
-			self.recent.pop_back();
+		{
+			let mut entry = self.history.entry(dapp).or_insert_with(|| Default::default());
+			entry.last_accessed = self.time.get();
 		}
+		// Clear extraneous entries
+		while self.history.len() > MAX_RECENT_DAPPS {
+			let min = self.history.iter()
+				.min_by_key(|&(_, ref v)| v.last_accessed)
+				.map(|(ref k, _)| k.clone())
+				.cloned();
+
+			match min {
+				Some(k) => self.history.remove(&k),
+				None => break,
+			};
+		}
+		self.history.save(JsonDappsHistory::write);
 	}
 
 	/// Sets current new dapps policy
 	pub fn set_policy(&mut self, policy: NewDappsPolicy) {
 		self.policy.insert("default".into(), policy);
-		self.policy.save(JsonNewDappsPolicy::write_new_dapps_policy);
+		self.policy.save(JsonNewDappsPolicy::write);
 	}
 
 	/// Sets accounts for specific dapp.
@@ -204,7 +271,7 @@ impl DappsSettingsStore {
 			let mut settings = self.settings.entry(id).or_insert_with(DappsSettings::default);
 			settings.accounts = accounts;
 		}
-		self.settings.save(JsonSettings::write_dapps_settings);
+		self.settings.save(JsonSettings::write);
 	}
 }
 
@@ -280,6 +347,7 @@ impl<K: hash::Hash + Eq, V> DiskMap<K, V> {
 #[cfg(test)]
 mod tests {
 	use super::{AddressBook, DappsSettingsStore, DappsSettings, NewDappsPolicy};
+	use account_provider::DappId;
 	use std::collections::HashMap;
 	use ethjson::misc::AccountMeta;
 	use devtools::RandomTempPath;
@@ -333,18 +401,22 @@ mod tests {
 	}
 
 	#[test]
-	fn should_maintain_a_list_of_recent_dapps() {
+	fn should_maintain_a_map_of_recent_dapps() {
 		let mut store = DappsSettingsStore::transient();
 		assert!(store.recent_dapps().is_empty(), "Initially recent dapps should be empty.");
 
-		store.mark_dapp_used("dapp1".into());
-		assert_eq!(store.recent_dapps(), vec!["dapp1".to_owned()]);
+		let dapp1: DappId = "dapp1".into();
+		let dapp2: DappId = "dapp2".into();
+		store.mark_dapp_used(dapp1.clone());
+		let recent = store.recent_dapps();
+		assert_eq!(recent.len(), 1);
+		assert_eq!(recent.get(&dapp1), Some(&1));
 
-		store.mark_dapp_used("dapp2".into());
-		assert_eq!(store.recent_dapps(), vec!["dapp2".to_owned(), "dapp1".to_owned()]);
-
-		store.mark_dapp_used("dapp1".into());
-		assert_eq!(store.recent_dapps(), vec!["dapp1".to_owned(), "dapp2".to_owned()]);
+		store.mark_dapp_used(dapp2.clone());
+		let recent = store.recent_dapps();
+		assert_eq!(recent.len(), 2);
+		assert_eq!(recent.get(&dapp1), Some(&1));
+		assert_eq!(recent.get(&dapp2), Some(&2));
 	}
 
 	#[test]
@@ -353,7 +425,7 @@ mod tests {
 		let temp = RandomTempPath::create_dir();
 		let path = temp.as_str().to_owned();
 		let mut store = DappsSettingsStore::new(path.clone());
-		
+
 		// Test default policy
 		assert_eq!(store.policy(), NewDappsPolicy::AllAccounts);
 

ethstore/src/dir/disk.rs

@@ -22,7 +22,13 @@ use {json, SafeAccount, Error};
 use json::Uuid;
 use super::KeyDirectory;
 
-const IGNORED_FILES: &'static [&'static str] = &["thumbs.db", "address_book.json", "dapps_policy.json"];
+const IGNORED_FILES: &'static [&'static str] = &[
+	"thumbs.db",
+	"address_book.json",
+	"dapps_policy.json",
+	"dapps_accounts.json",
+	"dapps_history.json",
+];
 
 #[cfg(not(windows))]
 fn restrict_permissions_to_owner(file_path: &Path) -> Result<(), i32>  {

json/src/hash.rs

@@ -29,9 +29,9 @@ macro_rules! impl_hash {
 		#[derive(Default, Debug, PartialEq, Eq, Hash, PartialOrd, Ord, Clone)]
 		pub struct $name(pub $inner);
 
-		impl Into<$inner> for $name {
-			fn into(self) -> $inner {
-				self.0
+		impl From<$name> for $inner {
+			fn from(other: $name) -> $inner {
+				other.0
 			}
 		}
 

json/src/misc/account_meta.rs

@@ -16,14 +16,10 @@
 
 //! Misc deserialization.
 
-use std::io::{Read, Write};
-use std::collections::HashMap;
-use serde_json;
-use util;
 use hash;
 
 /// Collected account metadata
-#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+#[derive(Default, Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct AccountMeta {
 	/// The name of the account.
 	pub name: String,
@@ -33,26 +29,4 @@ pub struct AccountMeta {
 	pub uuid: Option<String>,
 }
 
-impl Default for AccountMeta {
-	fn default() -> Self {
-		AccountMeta {
-			name: String::new(),
-			meta: "{}".to_owned(),
-			uuid: None,
-		}
-	}
-}
-
-impl AccountMeta {
-	/// Read a hash map of Address -> AccountMeta.
-	pub fn read_address_map<R>(reader: R) -> Result<HashMap<util::Address, AccountMeta>, serde_json::Error> where R: Read {
-		serde_json::from_reader(reader).map(|ok: HashMap<hash::Address, AccountMeta>|
-			ok.into_iter().map(|(a, m)| (a.into(), m)).collect()
-		)
-	}
-
-	/// Write a hash map of Address -> AccountMeta.
-	pub fn write_address_map<W>(m: &HashMap<util::Address, AccountMeta>, writer: &mut W) -> Result<(), serde_json::Error> where W: Write {
-		serde_json::to_writer(writer, &m.iter().map(|(a, m)| (a.clone().into(), m)).collect::<HashMap<hash::Address, _>>())
-	}
-}
+impl_serialization!(hash::Address => AccountMeta);

json/src/misc/dapps_settings.rs

@@ -16,13 +16,8 @@
 
 //! Dapps settings de/serialization.
 
-use std::io;
-use std::collections::HashMap;
-use serde_json;
 use hash;
 
-type DappId = String;
-
 /// Settings for specific dapp.
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct DappsSettings {
@@ -30,26 +25,17 @@ pub struct DappsSettings {
 	pub accounts: Vec<hash::Address>,
 }
 
-impl DappsSettings {
-	/// Read a hash map of DappId -> DappsSettings
-	pub fn read_dapps_settings<R, S>(reader: R) -> Result<HashMap<DappId, S>, serde_json::Error> where
-		R: io::Read,
-		S: From<DappsSettings> + Clone,
-	{
-		serde_json::from_reader(reader).map(|ok: HashMap<DappId, DappsSettings>|
-			ok.into_iter().map(|(a, m)| (a.into(), m.into())).collect()
-		)
-	}
+impl_serialization!(String => DappsSettings);
 
-	/// Write a hash map of DappId -> DappsSettings
-	pub fn write_dapps_settings<W, S>(m: &HashMap<DappId, S>, writer: &mut W) -> Result<(), serde_json::Error> where
-		W: io::Write,
-		S: Into<DappsSettings> + Clone,
-	{
-		serde_json::to_writer(writer, &m.iter().map(|(a, m)| (a.clone().into(), m.clone().into())).collect::<HashMap<DappId, DappsSettings>>())
-	}
+/// History for specific dapp.
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub struct DappsHistory {
+	/// Last accessed timestamp
+	pub last_accessed: u64,
 }
 
+impl_serialization!(String => DappsHistory);
+
 /// Accounts policy for new dapps.
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub enum NewDappsPolicy {
@@ -59,22 +45,4 @@ pub enum NewDappsPolicy {
 	Whitelist(Vec<hash::Address>),
 }
 
-impl NewDappsPolicy {
-	/// Read a hash map of `String -> NewDappsPolicy`
-	pub fn read_new_dapps_policy<R, S>(reader: R) -> Result<HashMap<String, S>, serde_json::Error> where
-		R: io::Read,
-		S: From<NewDappsPolicy> + Clone,
-	{
-		serde_json::from_reader(reader).map(|ok: HashMap<String, NewDappsPolicy>|
-			ok.into_iter().map(|(a, m)| (a.into(), m.into())).collect()
-		)
-	}
-
-	/// Write a hash map of `String -> NewDappsPolicy`
-	pub fn write_new_dapps_policy<W, S>(m: &HashMap<String, S>, writer: &mut W) -> Result<(), serde_json::Error> where
-		W: io::Write,
-		S: Into<NewDappsPolicy> + Clone,
-	{
-		serde_json::to_writer(writer, &m.iter().map(|(a, m)| (a.clone().into(), m.clone().into())).collect::<HashMap<String, NewDappsPolicy>>())
-	}
-}
+impl_serialization!(String => NewDappsPolicy);

json/src/misc/mod.rs

@@ -16,8 +16,39 @@
 
 //! Misc deserialization.
 
+macro_rules! impl_serialization {
+	($key: ty => $name: ty) => {
+		impl $name {
+			/// Read a hash map of DappId -> $name
+			pub fn read<R, S, D>(reader: R) -> Result<::std::collections::HashMap<D, S>, ::serde_json::Error> where
+				R: ::std::io::Read,
+				D: From<$key> + ::std::hash::Hash + Eq,
+				S: From<$name> + Clone,
+			{
+				::serde_json::from_reader(reader).map(|ok: ::std::collections::HashMap<$key, $name>|
+					ok.into_iter().map(|(a, m)| (a.into(), m.into())).collect()
+				)
+			}
+
+			/// Write a hash map of DappId -> $name
+			pub fn write<W, S, D>(m: &::std::collections::HashMap<D, S>, writer: &mut W) -> Result<(), ::serde_json::Error> where
+				W: ::std::io::Write,
+				D: Into<$key> + ::std::hash::Hash + Eq + Clone,
+				S: Into<$name> + Clone,
+			{
+				::serde_json::to_writer(
+					writer,
+					&m.iter()
+						.map(|(a, m)| (a.clone().into(), m.clone().into()))
+						.collect::<::std::collections::HashMap<$key, $name>>()
+				)
+			}
+		}
+	}
+}
+
 mod account_meta;
 mod dapps_settings;
 
-pub use self::dapps_settings::{DappsSettings, NewDappsPolicy};
+pub use self::dapps_settings::{DappsSettings, DappsHistory, NewDappsPolicy};
 pub use self::account_meta::AccountMeta;

rpc/src/v1/impls/parity_accounts.rs

@@ -196,12 +196,12 @@ impl<C: 'static> ParityAccounts for ParityAccountsClient<C> where C: MiningBlock
 			.map(|accounts| accounts.map(into_vec))
 	}
 
-	fn recent_dapps(&self) -> Result<Vec<DappId>, Error> {
+	fn recent_dapps(&self) -> Result<BTreeMap<DappId, u64>, Error> {
 		let store = take_weak!(self.accounts);
 
 		store.recent_dapps()
 			.map_err(|e| errors::account("Couldn't get recent dapps.", e))
-			.map(into_vec)
+			.map(|map| map.into_iter().map(|(k, v)| (k.into(), v)).collect())
 	}
 
 	fn import_geth_accounts(&self, addresses: Vec<RpcH160>) -> Result<Vec<RpcH160>, Error> {

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

@@ -173,7 +173,7 @@ fn rpc_parity_recent_dapps() {
 
 	// then
 	let request = r#"{"jsonrpc": "2.0", "method": "parity_listRecentDapps","params":[], "id": 1}"#;
-	let response = r#"{"jsonrpc":"2.0","result":["dapp1"],"id":1}"#;
+	let response = r#"{"jsonrpc":"2.0","result":{"dapp1":1},"id":1}"#;
 	assert_eq!(tester.io.handle_request_sync(request), Some(response.to_owned()));
 }
 

rpc/src/v1/traits/parity_accounts.rs

@@ -92,9 +92,10 @@ build_rpc_trait! {
 		#[rpc(name = "parity_getNewDappsWhitelist")]
 		fn new_dapps_whitelist(&self) -> Result<Option<Vec<H160>>, Error>;
 
-		/// Sets accounts exposed for particular dapp.
+		/// Returns identified dapps that recently used RPC
+		/// Includes last usage timestamp.
 		#[rpc(name = "parity_listRecentDapps")]
-		fn recent_dapps(&self) -> Result<Vec<DappId>, Error>;
+		fn recent_dapps(&self) -> Result<BTreeMap<DappId, u64>, Error>;
 
 		/// Imports a number of Geth accounts, with the list provided as the argument.
 		#[rpc(name = "parity_importGethAccounts")]

rpc/src/v1/types/dapp_id.rs

@@ -16,8 +16,10 @@
 
 //! Dapp Id type
 
+use ethcore::account_provider::DappId as EthDappId;
+
 /// Dapplication Internal Id
-#[derive(Debug, Default, Clone, Eq, PartialEq, Hash, Serialize, Deserialize)]
+#[derive(Debug, Default, Clone, Eq, PartialEq, Hash, Ord, PartialOrd, Serialize, Deserialize)]
 pub struct DappId(pub String);
 
 impl Into<String> for DappId {
@@ -32,6 +34,18 @@ impl From<String> for DappId {
 	}
 }
 
+impl From<EthDappId> for DappId {
+	fn from(id: EthDappId) -> Self {
+		DappId(id.into())
+	}
+}
+
+impl Into<EthDappId> for DappId {
+	fn into(self) -> EthDappId {
+		Into::<String>::into(self).into()
+	}
+}
+
 #[cfg(test)]
 mod tests {