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    531

    // 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/>.

    //! Account management.

    mod stores;

    use self::stores::{AddressBook, DappsSettingsStore, NewDappsPolicy};

    use std::fmt;
    use std::collections::HashMap;
    use std::time::{Instant, Duration};
    use util::RwLock;
    use ethstore::{SimpleSecretStore, SecretStore, Error as SSError, EthStore, EthMultiStore,
    	random_string, SecretVaultRef, StoreAccountRef};
    use ethstore::dir::MemoryDirectory;
    use ethstore::ethkey::{Address, Message, Public, Secret, Random, Generator};
    use ethjson::misc::AccountMeta;
    pub use ethstore::ethkey::Signature;

    /// Type of unlock.
    #[derive(Clone)]
    enum Unlock {
    	/// If account is unlocked temporarily, it should be locked after first usage.
    	Temp,
    	/// Account unlocked permantently can always sign message.
    	/// Use with caution.
    	Perm,
    	/// Account unlocked with a timeout
    	Timed(Instant),
    }

    /// Data associated with account.
    #[derive(Clone)]
    struct AccountData {
    	unlock: Unlock,
    	password: String,
    }

    /// Signing error
    #[derive(Debug)]
    pub enum SignError {
    	/// Account is not unlocked
    	NotUnlocked,
    	/// Low-level error from store
    	SStore(SSError)
    }

    impl fmt::Display for SignError {
    	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
    		match *self {
    			SignError::NotUnlocked => write!(f, "Account is locked"),
    			SignError::SStore(ref e) => write!(f, "{}", e),
    		}
    	}
    }

    impl From<SSError> for SignError {
    	fn from(e: SSError) -> Self {
    		SignError::SStore(e)
    	}
    }

    /// `AccountProvider` errors.
    pub type Error = SSError;

    /// Dapp identifier
    #[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")
    }

    type AccountToken = String;

    /// Account management.
    /// Responsible for unlocking accounts.
    pub struct AccountProvider {
    	unlocked: RwLock<HashMap<StoreAccountRef, AccountData>>,
    	address_book: RwLock<AddressBook>,
    	dapps_settings: RwLock<DappsSettingsStore>,
    	/// Accounts on disk
    	sstore: Box<SecretStore>,
    	/// Accounts unlocked with rolling tokens
    	transient_sstore: EthMultiStore,
    }

    impl AccountProvider {
    	/// Creates new account provider.
    	pub fn new(sstore: Box<SecretStore>) -> Self {
    		AccountProvider {
    			unlocked: RwLock::new(HashMap::new()),
    			address_book: RwLock::new(AddressBook::new(sstore.local_path().into())),
    			dapps_settings: RwLock::new(DappsSettingsStore::new(sstore.local_path().into())),
    			sstore: sstore,
    			transient_sstore: transient_sstore(),
    		}
    	}

    	/// Creates not disk backed provider.
    	pub fn transient_provider() -> Self {
    		AccountProvider {
    			unlocked: RwLock::new(HashMap::new()),
    			address_book: RwLock::new(AddressBook::transient()),
    			dapps_settings: RwLock::new(DappsSettingsStore::transient()),
    			sstore: Box::new(EthStore::open(Box::new(MemoryDirectory::default())).expect("MemoryDirectory load always succeeds; qed")),
    			transient_sstore: transient_sstore(),
    		}
    	}

    	/// Creates new random account.
    	pub fn new_account(&self, password: &str) -> Result<Address, Error> {
    		self.new_account_and_public(password).map(|d| d.0)
    	}

    	/// Creates new random account and returns address and public key
    	pub fn new_account_and_public(&self, password: &str) -> Result<(Address, Public), Error> {
    		let acc = Random.generate().expect("secp context has generation capabilities; qed");
    		let public = acc.public().clone();
    		let secret = acc.secret().clone();
    		let account = self.sstore.insert_account(SecretVaultRef::Root, secret, password)?;
    		Ok((account.address, public))
    	}

    	/// Inserts new account into underlying store.
    	/// Does not unlock account!
    	pub fn insert_account(&self, secret: Secret, password: &str) -> Result<Address, Error> {
    		let account = self.sstore.insert_account(SecretVaultRef::Root, secret, password)?;
    		Ok(account.address)
    	}

    	/// Import a new presale wallet.
    	pub fn import_presale(&self, presale_json: &[u8], password: &str) -> Result<Address, Error> {
    		let account = self.sstore.import_presale(SecretVaultRef::Root, presale_json, password)?;
    		Ok(Address::from(account.address).into())
    	}

    	/// Import a new presale wallet.
    	pub fn import_wallet(&self, json: &[u8], password: &str) -> Result<Address, Error> {
    		let account = self.sstore.import_wallet(SecretVaultRef::Root, json, password)?;
    		Ok(Address::from(account.address).into())
    	}

    	/// Checks whether an account with a given address is present.
    	pub fn has_account(&self, address: Address) -> Result<bool, Error> {
    		Ok(self.accounts()?.iter().any(|&a| a == address))
    	}

    	/// Returns addresses of all accounts.
    	pub fn accounts(&self) -> Result<Vec<Address>, Error> {
    		let accounts = self.sstore.accounts()?;
    		Ok(accounts.into_iter().map(|a| a.address).collect())
    	}

    	/// Sets a whitelist of accounts exposed for unknown dapps.
    	/// `None` means that all accounts will be visible.
    	pub fn set_new_dapps_whitelist(&self, accounts: Option<Vec<Address>>) -> Result<(), Error> {
    		self.dapps_settings.write().set_policy(match accounts {
    			None => NewDappsPolicy::AllAccounts,
    			Some(accounts) => NewDappsPolicy::Whitelist(accounts),
    		});
    		Ok(())
    	}

    	/// Gets a whitelist of accounts exposed for unknown dapps.
    	/// `None` means that all accounts will be visible.
    	pub fn new_dapps_whitelist(&self) -> Result<Option<Vec<Address>>, Error> {
    		Ok(match self.dapps_settings.read().policy() {
    			NewDappsPolicy::AllAccounts => None,
    			NewDappsPolicy::Whitelist(accounts) => Some(accounts),
    		})
    	}

    	/// Gets a list of dapps recently requesting accounts.
    	pub fn recent_dapps(&self) -> Result<HashMap<DappId, u64>, Error> {
    		Ok(self.dapps_settings.read().recent_dapps())
    	}

    	/// Marks dapp as recently used.
    	pub fn note_dapp_used(&self, dapp: DappId) -> Result<(), Error> {
    		let mut dapps = self.dapps_settings.write();
    		dapps.mark_dapp_used(dapp.clone());
    		Ok(())
    	}

    	/// Gets addresses visile for dapp.
    	pub fn dapps_addresses(&self, dapp: DappId) -> Result<Vec<Address>, Error> {
    		let dapps = self.dapps_settings.read();

    		let accounts = dapps.settings().get(&dapp).map(|settings| settings.accounts.clone());
    		match accounts {
    			Some(accounts) => Ok(accounts),
    			None => match dapps.policy() {
    				NewDappsPolicy::AllAccounts => self.accounts(),
    				NewDappsPolicy::Whitelist(accounts) => Ok(accounts),
    			}
    		}
    	}

    	/// Returns default account for particular dapp falling back to other allowed accounts if necessary.
    	pub fn default_address(&self, dapp: DappId) -> Result<Address, Error> {
    		self.dapps_addresses(dapp)?
    			.get(0)
    			.cloned()
    			.ok_or(SSError::InvalidAccount)
    	}

    	/// Sets addresses visile for dapp.
    	pub fn set_dapps_addresses(&self, dapp: DappId, addresses: Vec<Address>) -> Result<(), Error> {
    		self.dapps_settings.write().set_accounts(dapp, addresses);
    		Ok(())
    	}

    	/// Returns each address along with metadata.
    	pub fn addresses_info(&self) -> Result<HashMap<Address, AccountMeta>, Error> {
    		Ok(self.address_book.read().get())
    	}

    	/// Returns each address along with metadata.
    	pub fn set_address_name(&self, account: Address, name: String) -> Result<(), Error> {
    		Ok(self.address_book.write().set_name(account, name))
    	}

    	/// Returns each address along with metadata.
    	pub fn set_address_meta(&self, account: Address, meta: String) -> Result<(), Error> {
    		Ok(self.address_book.write().set_meta(account, meta))
    	}

    	/// Removes and address from the addressbook
    	pub fn remove_address(&self, addr: Address) -> Result<(), Error> {
    		Ok(self.address_book.write().remove(addr))
    	}

    	/// Returns each account along with name and meta.
    	pub fn accounts_info(&self) -> Result<HashMap<Address, AccountMeta>, Error> {
    		let r: HashMap<Address, AccountMeta> = self.sstore.accounts()?
    			.into_iter()
    			.map(|a| (a.address.clone(), self.account_meta(a.address).ok().unwrap_or_default()))
    			.collect();
    		Ok(r)
    	}

    	/// Returns each account along with name and meta.
    	pub fn account_meta(&self, address: Address) -> Result<AccountMeta, Error> {
    		let account = StoreAccountRef::root(address);
    		Ok(AccountMeta {
    			name: self.sstore.name(&account)?,
    			meta: self.sstore.meta(&account)?,
    			uuid: self.sstore.uuid(&account).ok().map(Into::into),	// allowed to not have a Uuid
    		})
    	}

    	/// Returns each account along with name and meta.
    	pub fn set_account_name(&self, address: Address, name: String) -> Result<(), Error> {
    		self.sstore.set_name(&StoreAccountRef::root(address), name)?;
    		Ok(())
    	}

    	/// Returns each account along with name and meta.
    	pub fn set_account_meta(&self, address: Address, meta: String) -> Result<(), Error> {
    		self.sstore.set_meta(&StoreAccountRef::root(address), meta)?;
    		Ok(())
    	}

    	/// Returns `true` if the password for `account` is `password`. `false` if not.
    	pub fn test_password(&self, address: &Address, password: &str) -> Result<bool, Error> {
    		self.sstore.test_password(&StoreAccountRef::root(address.clone()), password)
    			.map_err(Into::into)
    	}

    	/// Permanently removes an account.
    	pub fn kill_account(&self, address: &Address, password: &str) -> Result<(), Error> {
    		self.sstore.remove_account(&StoreAccountRef::root(address.clone()), &password)?;
    		Ok(())
    	}

    	/// Changes the password of `account` from `password` to `new_password`. Fails if incorrect `password` given.
    	pub fn change_password(&self, account: &Address, password: String, new_password: String) -> Result<(), Error> {
    		self.sstore.change_password(&StoreAccountRef::root(account.clone()), &password, &new_password)
    	}

    	/// Helper method used for unlocking accounts.
    	fn unlock_account(&self, address: Address, password: String, unlock: Unlock) -> Result<(), Error> {
    		// verify password by signing dump message
    		// result may be discarded
    		let account = StoreAccountRef::root(address);
    		let _ = self.sstore.sign(&account, &password, &Default::default())?;

    		// check if account is already unlocked pernamently, if it is, do nothing
    		let mut unlocked = self.unlocked.write();
    		if let Some(data) = unlocked.get(&account) {
    			if let Unlock::Perm = data.unlock {
    				return Ok(())
    			}
    		}

    		let data = AccountData {
    			unlock: unlock,
    			password: password,
    		};

    		unlocked.insert(account, data);
    		Ok(())
    	}

    	fn password(&self, account: &StoreAccountRef) -> Result<String, SignError> {
    		let mut unlocked = self.unlocked.write();
    		let data = unlocked.get(account).ok_or(SignError::NotUnlocked)?.clone();
    		if let Unlock::Temp = data.unlock {
    			unlocked.remove(account).expect("data exists: so key must exist: qed");
    		}
    		if let Unlock::Timed(ref end) = data.unlock {
    			if Instant::now() > *end {
    				unlocked.remove(account).expect("data exists: so key must exist: qed");
    				return Err(SignError::NotUnlocked);
    			}
    		}
    		Ok(data.password.clone())
    	}

    	/// Unlocks account permanently.
    	pub fn unlock_account_permanently(&self, account: Address, password: String) -> Result<(), Error> {
    		self.unlock_account(account, password, Unlock::Perm)
    	}

    	/// Unlocks account temporarily (for one signing).
    	pub fn unlock_account_temporarily(&self, account: Address, password: String) -> Result<(), Error> {
    		self.unlock_account(account, password, Unlock::Temp)
    	}

    	/// Unlocks account temporarily with a timeout.
    	pub fn unlock_account_timed(&self, account: Address, password: String, duration_ms: u32) -> Result<(), Error> {
    		self.unlock_account(account, password, Unlock::Timed(Instant::now() + Duration::from_millis(duration_ms as u64)))
    	}

    	/// Checks if given account is unlocked
    	pub fn is_unlocked(&self, address: Address) -> bool {
    		let unlocked = self.unlocked.read();
    		let account = StoreAccountRef::root(address);
    		unlocked.get(&account).is_some()
    	}

    	/// Signs the message. If password is not provided the account must be unlocked.
    	pub fn sign(&self, address: Address, password: Option<String>, message: Message) -> Result<Signature, SignError> {
    		let account = StoreAccountRef::root(address);
    		let password = password.map(Ok).unwrap_or_else(|| self.password(&account))?;
    		Ok(self.sstore.sign(&account, &password, &message)?)
    	}

    	/// Signs given message with supplied token. Returns a token to use in next signing within this session.
    	pub fn sign_with_token(&self, address: Address, token: AccountToken, message: Message) -> Result<(Signature, AccountToken), SignError> {
    		let account = StoreAccountRef::root(address);
    		let is_std_password = self.sstore.test_password(&account, &token)?;

    		let new_token = random_string(16);
    		let signature = if is_std_password {
    			// Insert to transient store
    			self.sstore.copy_account(&self.transient_sstore, SecretVaultRef::Root, &account, &token, &new_token)?;
    			// sign
    			self.sstore.sign(&account, &token, &message)?
    		} else {
    			// check transient store
    			self.transient_sstore.change_password(&account, &token, &new_token)?;
    			// and sign
    			self.transient_sstore.sign(&account, &new_token, &message)?
    		};

    		Ok((signature, new_token))
    	}

    	/// Decrypts a message with given token. Returns a token to use in next operation for this account.
    	pub fn decrypt_with_token(&self, address: Address, token: AccountToken, shared_mac: &[u8], message: &[u8])
    		-> Result<(Vec<u8>, AccountToken), SignError>
    	{
    		let account = StoreAccountRef::root(address);
    		let is_std_password = self.sstore.test_password(&account, &token)?;

    		let new_token = random_string(16);
    		let message = if is_std_password {
    			// Insert to transient store
    			self.sstore.copy_account(&self.transient_sstore, SecretVaultRef::Root, &account, &token, &new_token)?;
    			// decrypt
    			self.sstore.decrypt(&account, &token, shared_mac, message)?
    		} else {
    			// check transient store
    			self.transient_sstore.change_password(&account, &token, &new_token)?;
    			// and decrypt
    			self.transient_sstore.decrypt(&account, &token, shared_mac, message)?
    		};

    		Ok((message, new_token))
    	}

    	/// Decrypts a message. If password is not provided the account must be unlocked.
    	pub fn decrypt(&self, address: Address, password: Option<String>, shared_mac: &[u8], message: &[u8]) -> Result<Vec<u8>, SignError> {
    		let account = StoreAccountRef::root(address);
    		let password = password.map(Ok).unwrap_or_else(|| self.password(&account))?;
    		Ok(self.sstore.decrypt(&account, &password, shared_mac, message)?)
    	}

    	/// Returns the underlying `SecretStore` reference if one exists.
    	pub fn list_geth_accounts(&self, testnet: bool) -> Vec<Address> {
    		self.sstore.list_geth_accounts(testnet).into_iter().map(|a| Address::from(a).into()).collect()
    	}

    	/// Returns the underlying `SecretStore` reference if one exists.
    	pub fn import_geth_accounts(&self, desired: Vec<Address>, testnet: bool) -> Result<Vec<Address>, Error> {
    		self.sstore.import_geth_accounts(SecretVaultRef::Root, desired, testnet)
    			.map(|a| a.into_iter().map(|a| a.address).collect())
    			.map_err(Into::into)
    	}
    }

    #[cfg(test)]
    mod tests {
    	use super::{AccountProvider, Unlock, DappId};
    	use std::time::Instant;
    	use ethstore::ethkey::{Generator, Random};
    	use ethstore::StoreAccountRef;

    	#[test]
    	fn unlock_account_temp() {
    		let kp = Random.generate().unwrap();
    		let ap = AccountProvider::transient_provider();
    		assert!(ap.insert_account(kp.secret().clone(), "test").is_ok());
    		assert!(ap.unlock_account_temporarily(kp.address(), "test1".into()).is_err());
    		assert!(ap.unlock_account_temporarily(kp.address(), "test".into()).is_ok());
    		assert!(ap.sign(kp.address(), None, Default::default()).is_ok());
    		assert!(ap.sign(kp.address(), None, Default::default()).is_err());
    	}

    	#[test]
    	fn unlock_account_perm() {
    		let kp = Random.generate().unwrap();
    		let ap = AccountProvider::transient_provider();
    		assert!(ap.insert_account(kp.secret().clone(), "test").is_ok());
    		assert!(ap.unlock_account_permanently(kp.address(), "test1".into()).is_err());
    		assert!(ap.unlock_account_permanently(kp.address(), "test".into()).is_ok());
    		assert!(ap.sign(kp.address(), None, Default::default()).is_ok());
    		assert!(ap.sign(kp.address(), None, Default::default()).is_ok());
    		assert!(ap.unlock_account_temporarily(kp.address(), "test".into()).is_ok());
    		assert!(ap.sign(kp.address(), None, Default::default()).is_ok());
    		assert!(ap.sign(kp.address(), None, Default::default()).is_ok());
    	}

    	#[test]
    	fn unlock_account_timer() {
    		let kp = Random.generate().unwrap();
    		let ap = AccountProvider::transient_provider();
    		assert!(ap.insert_account(kp.secret().clone(), "test").is_ok());
    		assert!(ap.unlock_account_timed(kp.address(), "test1".into(), 60000).is_err());
    		assert!(ap.unlock_account_timed(kp.address(), "test".into(), 60000).is_ok());
    		assert!(ap.sign(kp.address(), None, Default::default()).is_ok());
    		ap.unlocked.write().get_mut(&StoreAccountRef::root(kp.address())).unwrap().unlock = Unlock::Timed(Instant::now());
    		assert!(ap.sign(kp.address(), None, Default::default()).is_err());
    	}

    	#[test]
    	fn should_sign_and_return_token() {
    		// given
    		let kp = Random.generate().unwrap();
    		let ap = AccountProvider::transient_provider();
    		assert!(ap.insert_account(kp.secret().clone(), "test").is_ok());

    		// when
    		let (_signature, token) = ap.sign_with_token(kp.address(), "test".into(), Default::default()).unwrap();

    		// then
    		ap.sign_with_token(kp.address(), token.clone(), Default::default())
    			.expect("First usage of token should be correct.");
    		assert!(ap.sign_with_token(kp.address(), token, Default::default()).is_err(), "Second usage of the same token should fail.");
    	}

    	#[test]
    	fn should_set_dapps_addresses() {
    		// given
    		let ap = AccountProvider::transient_provider();
    		let app = DappId("app1".into());
    		// set `AllAccounts` policy
    		ap.set_new_dapps_whitelist(None).unwrap();

    		// when
    		ap.set_dapps_addresses(app.clone(), vec![1.into(), 2.into()]).unwrap();

    		// then
    		assert_eq!(ap.dapps_addresses(app.clone()).unwrap(), vec![1.into(), 2.into()]);
    	}

    	#[test]
    	fn should_set_dapps_policy() {
    		// given
    		let ap = AccountProvider::transient_provider();
    		let address = ap.new_account("test").unwrap();

    		// When returning nothing
    		ap.set_new_dapps_whitelist(Some(vec![])).unwrap();
    		assert_eq!(ap.dapps_addresses("app1".into()).unwrap(), vec![]);

    		// change to all
    		ap.set_new_dapps_whitelist(None).unwrap();
    		assert_eq!(ap.dapps_addresses("app1".into()).unwrap(), vec![address]);

    		// change to a whitelist
    		ap.set_new_dapps_whitelist(Some(vec![1.into()])).unwrap();
    		assert_eq!(ap.dapps_addresses("app1".into()).unwrap(), vec![1.into()]);
    	}
    }

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