API Lifecycle Implementation, Part 2 (#217)

* additon of 'get_mnemonic' API function

* rustfmt

* added 'change_password' api function

* rustfmt

* add 'delete_wallet' function'

* rustfmt

api/src/owner.rs

@@ -1565,6 +1565,130 @@ where
 		let lc = w_lock.lc_provider()?;
 		lc.close_wallet(name)
 	}
+
+	/// Return the BIP39 mnemonic for the given wallet. This function will decrypt
+	/// the wallet's seed file with the given password, and thus does not need the
+	/// wallet to be open.
+	///
+	/// # Arguments
+	///
+	/// * `name`: Reserved for future use, use `None` for the time being.
+	/// * `password`: The password used to encrypt the seed file.
+	///
+	/// # Returns
+	/// * Ok(BIP-39 mneminc) if successful
+	/// * or [`libwallet::Error`](../grin_wallet_libwallet/struct.Error.html) if an error is encountered.
+	///
+	/// # Example
+	/// Set up as in [`new`](struct.Owner.html#method.new) method above.
+	/// ```
+	/// # grin_wallet_api::doctest_helper_setup_doc_env!(wallet, wallet_config);
+	///
+	/// use grin_core::global::ChainTypes;
+	///
+	///	// Set up as above
+	/// # let api_owner = Owner::new(wallet.clone());
+	///
+	///	let pw = ZeroingString::from("my_password");
+	/// let res = api_owner.get_mnemonic(None, pw);
+	///
+	/// if let Ok(mne) = res {
+	///		// ...
+	/// }
+	/// ```
+	pub fn get_mnemonic(
+		&self,
+		name: Option<&str>,
+		password: ZeroingString,
+	) -> Result<ZeroingString, Error> {
+		let mut w_lock = self.wallet_inst.lock();
+		let lc = w_lock.lc_provider()?;
+		lc.get_mnemonic(name, password)
+	}
+
+	/// Changes a wallet's password, meaning the old seed file is decrypted with the old password,
+	/// and a new seed file is created with the same mnemonic and encrypted with the new password.
+	///
+	/// This function temporarily backs up the old seed file until a test-decryption of the new
+	/// file is confirmed to contain the same seed as the original seed file, at which point the
+	/// backup is deleted. If this operation fails for an unknown reason, the backup file will still
+	/// exist in the wallet's data directory encrypted with the old password.
+	///
+	/// # Arguments
+	///
+	/// * `name`: Reserved for future use, use `None` for the time being.
+	/// * `old`: The password used to encrypt the existing seed file (i.e. old password)
+	/// * `new`: The password to be used to encrypt the new seed file
+	///
+	/// # Returns
+	/// * Ok(()) if successful
+	/// * or [`libwallet::Error`](../grin_wallet_libwallet/struct.Error.html) if an error is encountered.
+	///
+	/// # Example
+	/// Set up as in [`new`](struct.Owner.html#method.new) method above.
+	/// ```
+	/// # grin_wallet_api::doctest_helper_setup_doc_env!(wallet, wallet_config);
+	///
+	/// use grin_core::global::ChainTypes;
+	///
+	///	// Set up as above
+	/// # let api_owner = Owner::new(wallet.clone());
+	///
+	///	let old = ZeroingString::from("my_password");
+	///	let new = ZeroingString::from("new_password");
+	/// let res = api_owner.change_password(None, old, new);
+	///
+	/// if let Ok(mne) = res {
+	///		// ...
+	/// }
+	/// ```
+	pub fn change_password(
+		&self,
+		name: Option<&str>,
+		old: ZeroingString,
+		new: ZeroingString,
+	) -> Result<(), Error> {
+		let mut w_lock = self.wallet_inst.lock();
+		let lc = w_lock.lc_provider()?;
+		lc.change_password(name, old, new)
+	}
+
+	/// Deletes a wallet, removing the config file, seed file and all data files.
+	/// Obviously, use with extreme caution and plenty of user warning
+	///
+	/// Highly recommended that the wallet be explicitly closed first via the `close_wallet`
+	/// function.
+	///
+	/// # Arguments
+	///
+	/// * `name`: Reserved for future use, use `None` for the time being.
+	///
+	/// # Returns
+	/// * Ok if successful
+	/// * or [`libwallet::Error`](../grin_wallet_libwallet/struct.Error.html) if an error is encountered.
+	///
+	/// # Example
+	/// Set up as in [`new`](struct.Owner.html#method.new) method above.
+	/// ```
+	/// # grin_wallet_api::doctest_helper_setup_doc_env!(wallet, wallet_config);
+	///
+	/// use grin_core::global::ChainTypes;
+	///
+	///	// Set up as above
+	/// # let api_owner = Owner::new(wallet.clone());
+	///
+	/// let res = api_owner.delete_wallet(None);
+	///
+	/// if let Ok(_) = res {
+	///		// ...
+	/// }
+	/// ```
+
+	pub fn delete_wallet(&self, name: Option<&str>) -> Result<(), Error> {
+		let mut w_lock = self.wallet_inst.lock();
+		let lc = w_lock.lc_provider()?;
+		lc.delete_wallet(name)
+	}
 }
 
 #[doc(hidden)]

api/src/owner_rpc_s.rs

@@ -1587,6 +1587,102 @@ pub trait OwnerRpcS {
 	*/
 
 	fn close_wallet(&self, name: Option<String>) -> Result<(), ErrorKind>;
+
+	/**
+	Networked version of [Owner::get_mnemonic](struct.Owner.html#method.get_mnemonic).
+	```
+	# grin_wallet_api::doctest_helper_json_rpc_owner_assert_response!(
+	# r#"
+	{
+		"jsonrpc": "2.0",
+		"method": "get_mnemonic",
+		"params": {
+			"name": null,
+			"password": ""
+		},
+		"id": 1
+	}
+	# "#
+	# ,
+	# r#"
+	{
+		"id": 1,
+		"jsonrpc": "2.0",
+		"result": {
+			"Ok": "fat twenty mean degree forget shell check candy immense awful flame next during february bulb bike sun wink theory day kiwi embrace peace lunch"
+		}
+	}
+	# "#
+	# , true, 0, false, false, false);
+	```
+	*/
+
+	fn get_mnemonic(&self, name: Option<String>, password: String) -> Result<String, ErrorKind>;
+
+	/**
+	Networked version of [Owner::change_password](struct.Owner.html#method.change_password).
+	```
+	# grin_wallet_api::doctest_helper_json_rpc_owner_assert_response!(
+	# r#"
+	{
+		"jsonrpc": "2.0",
+		"method": "change_password",
+		"params": {
+			"name": null,
+			"old": "",
+			"new": "new_password"
+		},
+		"id": 1
+	}
+	# "#
+	# ,
+	# r#"
+	{
+		"id": 1,
+		"jsonrpc": "2.0",
+		"result": {
+			"Ok": null
+		}
+	}
+	# "#
+	# , true, 0, false, false, false);
+	```
+	*/
+	fn change_password(
+		&self,
+		name: Option<String>,
+		old: String,
+		new: String,
+	) -> Result<(), ErrorKind>;
+
+	/**
+	Networked version of [Owner::delete_wallet](struct.Owner.html#method.delete_wallet).
+	```
+	# grin_wallet_api::doctest_helper_json_rpc_owner_assert_response!(
+	# r#"
+	{
+		"jsonrpc": "2.0",
+		"method": "delete_wallet",
+		"params": {
+			"name": null
+		},
+		"id": 1
+	}
+	# "#
+	# ,
+	# r#"
+	{
+		"id": 1,
+		"jsonrpc": "2.0",
+		"result": {
+			"Ok": null
+		}
+	}
+	# "#
+	# , true, 0, false, false, false);
+	```
+	*/
+	fn delete_wallet(&self, name: Option<String>) -> Result<(), ErrorKind>;
 }
 
 impl<'a, L, C, K> OwnerRpcS for Owner<'a, L, C, K>
@@ -1843,4 +1939,27 @@ where
 		let n = name.as_ref().map(|s| s.as_str());
 		Owner::close_wallet(self, n).map_err(|e| e.kind())
 	}
+
+	fn get_mnemonic(&self, name: Option<String>, password: String) -> Result<String, ErrorKind> {
+		let n = name.as_ref().map(|s| s.as_str());
+		let res =
+			Owner::get_mnemonic(self, n, ZeroingString::from(password)).map_err(|e| e.kind())?;
+		Ok(format!("{}", &*res))
+	}
+
+	fn change_password(
+		&self,
+		name: Option<String>,
+		old: String,
+		new: String,
+	) -> Result<(), ErrorKind> {
+		let n = name.as_ref().map(|s| s.as_str());
+		Owner::change_password(self, n, ZeroingString::from(old), ZeroingString::from(new))
+			.map_err(|e| e.kind())
+	}
+
+	fn delete_wallet(&self, name: Option<String>) -> Result<(), ErrorKind> {
+		let n = name.as_ref().map(|s| s.as_str());
+		Owner::delete_wallet(self, n).map_err(|e| e.kind())
+	}
 }

impls/src/lifecycle/default.rs

@@ -202,8 +202,9 @@ where
 				}
 				Ok(d) => d,
 			};
-		let wallet_seed = WalletSeed::from_file(&data_dir_name, password)
-			.context(ErrorKind::Lifecycle("Error opening wallet".into()))?;
+		let wallet_seed = WalletSeed::from_file(&data_dir_name, password).context(
+			ErrorKind::Lifecycle("Error opening wallet (is password correct?)".into()),
+		)?;
 		let keychain = wallet_seed
 			.derive_keychain(global::is_floonet())
 			.context(ErrorKind::Lifecycle("Error deriving keychain".into()))?;
@@ -270,12 +271,69 @@ where
 		Ok(())
 	}
 
-	fn change_password(&self, _old: String, _new: String) -> Result<(), Error> {
-		unimplemented!()
+	fn change_password(
+		&self,
+		_name: Option<&str>,
+		old: ZeroingString,
+		new: ZeroingString,
+	) -> Result<(), Error> {
+		let mut data_dir_name = PathBuf::from(self.data_dir.clone());
+		data_dir_name.push(GRIN_WALLET_DIR);
+		let data_dir_name = data_dir_name.to_str().unwrap();
+		// get seed for later check
+
+		let orig_wallet_seed = WalletSeed::from_file(&data_dir_name, old).context(
+			ErrorKind::Lifecycle("Error opening wallet seed file".into()),
+		)?;
+		let orig_mnemonic = orig_wallet_seed
+			.to_mnemonic()
+			.context(ErrorKind::Lifecycle("Error recovering mnemonic".into()))?;
+
+		// Back up existing seed, and keep track of filename as we're deleting it
+		// once the password change is confirmed
+		let backup_name = WalletSeed::backup_seed(data_dir_name).context(ErrorKind::Lifecycle(
+			"Error temporarily backing up existing seed".into(),
+		))?;
+
+		// Delete seed file
+		WalletSeed::delete_seed_file(data_dir_name).context(ErrorKind::Lifecycle(
+			"Unable to delete seed file for password change".into(),
+		))?;
+
+		// Init a new file
+		let _ = WalletSeed::init_file(
+			data_dir_name,
+			0,
+			Some(ZeroingString::from(orig_mnemonic)),
+			new.clone(),
+		);
+		info!("Wallet seed file created");
+
+		let new_wallet_seed = WalletSeed::from_file(&data_dir_name, new).context(
+			ErrorKind::Lifecycle("Error opening wallet seed file".into()),
+		)?;
+
+		if orig_wallet_seed != new_wallet_seed {
+			let msg = format!(
+				"New and Old wallet seeds are not equal on password change, not removing backups."
+			);
+			return Err(ErrorKind::Lifecycle(msg).into());
+		}
+		// Removin
+		info!("Password change confirmed, removing old seed file.");
+		fs::remove_file(backup_name).context(ErrorKind::IO)?;
+
+		Ok(())
 	}
 
-	fn delete_wallet(&self, _name: Option<String>, _password: String) -> Result<(), Error> {
-		unimplemented!()
+	fn delete_wallet(&self, _name: Option<&str>) -> Result<(), Error> {
+		let data_dir_name = PathBuf::from(self.data_dir.clone());
+		warn!(
+			"Removing all wallet data from: {}",
+			data_dir_name.to_str().unwrap()
+		);
+		fs::remove_dir_all(data_dir_name).context(ErrorKind::IO)?;
+		Ok(())
 	}
 
 	fn wallet_inst(&mut self) -> Result<&mut Box<dyn WalletBackend<'a, C, K> + 'a>, Error> {

impls/src/lifecycle/seed.rs

@@ -94,7 +94,7 @@ impl WalletSeed {
 		}
 	}
 
-	pub fn backup_seed(data_file_dir: &str) -> Result<(), Error> {
+	pub fn backup_seed(data_file_dir: &str) -> Result<String, Error> {
 		let seed_file_name = &format!("{}{}{}", data_file_dir, MAIN_SEPARATOR, SEED_FILE,);
 
 		let mut path = Path::new(seed_file_name).to_path_buf();
@@ -114,7 +114,7 @@ impl WalletSeed {
 			))?;
 		}
 		warn!("{} backed up as {}", seed_file_name, backup_seed_file_name);
-		Ok(())
+		Ok(backup_seed_file_name)
 	}
 
 	pub fn recover_from_phrase(
@@ -180,7 +180,6 @@ impl WalletSeed {
 		data_file_dir: &str,
 		password: util::ZeroingString,
 	) -> Result<WalletSeed, Error> {
-		// TODO: Is this desirable any more?
 		// create directory if it doesn't exist
 		fs::create_dir_all(data_file_dir).context(ErrorKind::IO)?;
 
@@ -205,6 +204,15 @@ impl WalletSeed {
 			Err(ErrorKind::WalletSeedDoesntExist)?
 		}
 	}
+
+	pub fn delete_seed_file(data_file_dir: &str) -> Result<(), Error> {
+		let seed_file_path = &format!("{}{}{}", data_file_dir, MAIN_SEPARATOR, SEED_FILE,);
+		if Path::new(seed_file_path).exists() {
+			debug!("Deleting wallet seed file at: {}", seed_file_path);
+			fs::remove_file(seed_file_path).context(ErrorKind::IO)?;
+		}
+		Ok(())
+	}
 }
 
 /// Encrypted wallet seed, for storing on disk and decrypting