EIP-712 implementation (#9631)

* EIP-712 impl

* added more tests

* removed size parsing unwrap

* corrected TYPE_REGEX to disallow zero sized fixed length arrays, replaced LinkedHashSet with IndexSet, added API spec to docs, fixed Type::Byte encoding branch

* use Option<u64> instead of u64 for Type::Array::Length

* replace `.iter()` with  `.values()`

Co-Authored-By: seunlanlege <[email protected]>

* tabify eip712.rs

* use proper comments for docs

* Cargo.lock: revert unrelated changes

* tabify encode.rs

rpc/Cargo.toml

@@ -59,6 +59,7 @@ parity-updater = { path = "../updater" }
 parity-version = { path = "../util/version" }
 patricia-trie = "0.3.0"
 rlp = { version = "0.3.0", features = ["ethereum"] }
+eip712 = { path = "../util/EIP-712" }
 stats = { path = "../util/stats" }
 vm = { path = "../ethcore/vm" }
 

rpc/src/lib.rs

@@ -63,6 +63,7 @@ extern crate parity_runtime;
 extern crate parity_updater as updater;
 extern crate parity_version as version;
 extern crate patricia_trie as trie;
+extern crate eip712;
 extern crate rlp;
 extern crate stats;
 extern crate vm;

rpc/src/v1/helpers/errors.rs

@@ -286,6 +286,14 @@ pub fn signing(error: AccountError) -> Error {
 	}
 }
 
+pub fn invalid_call_data<T: fmt::Display>(error: T) -> Error {
+	Error {
+		code: ErrorCode::ServerError(codes::ENCODING_ERROR),
+		message: format!("{}", error),
+		data: None
+	}
+}
+
 pub fn password(error: AccountError) -> Error {
 	Error {
 		code: ErrorCode::ServerError(codes::PASSWORD_INVALID),

rpc/src/v1/impls/personal.rs

@@ -38,6 +38,7 @@ use v1::types::{
 	RichRawTransaction as RpcRichRawTransaction,
 };
 use v1::metadata::Metadata;
+use eip712::{EIP712, hash_structured_data};
 
 /// Account management (personal) rpc implementation.
 pub struct PersonalClient<D: Dispatcher> {
@@ -150,6 +151,29 @@ impl<D: Dispatcher + 'static> Personal for PersonalClient<D> {
 				 }))
 	}
 
+	fn sign_typed_data(&self, typed_data: EIP712, account: RpcH160, password: String) -> BoxFuture<RpcH520> {
+		let data = match hash_structured_data(typed_data) {
+			Ok(d) => d,
+			Err(err) => return Box::new(future::done(Err(errors::invalid_call_data(err.kind())))),
+		};
+		let dispatcher = self.dispatcher.clone();
+		let accounts = self.accounts.clone();
+
+		let payload = RpcConfirmationPayload::EthSignMessage((account.clone(), RpcBytes(data)).into());
+
+		Box::new(dispatch::from_rpc(payload, account.into(), &dispatcher)
+			.and_then(|payload| {
+				dispatch::execute(dispatcher, accounts, payload, dispatch::SignWith::Password(password.into()))
+			})
+			.map(|v| v.into_value())
+			.then(|res| match res {
+				Ok(RpcConfirmationResponse::Signature(signature)) => Ok(signature),
+				Err(e) => Err(e),
+				e => Err(errors::internal("Unexpected result", e)),
+			})
+		)
+	}
+
 	fn ec_recover(&self, data: RpcBytes, signature: RpcH520) -> BoxFuture<RpcH160> {
 		let signature: H520 = signature.into();
 		let signature = Signature::from_electrum(&signature);

rpc/src/v1/traits/personal.rs

@@ -16,7 +16,7 @@
 
 //! Personal rpc interface.
 use jsonrpc_core::{BoxFuture, Result};
-
+use eip712::EIP712;
 use v1::types::{Bytes, U128, H160, H256, H520, TransactionRequest, RichRawTransaction as RpcRichRawTransaction};
 
 build_rpc_trait! {
@@ -42,6 +42,11 @@ build_rpc_trait! {
 		#[rpc(name = "personal_sign")]
 		fn sign(&self, Bytes, H160, String) -> BoxFuture<H520>;
 
+		/// Produces an EIP-712 compliant signature with given account using the given password to unlock the
+		/// account during the request.
+		#[rpc(name = "personal_signTypedData")]
+		fn sign_typed_data(&self, EIP712, H160, String) -> BoxFuture<H520>;
+
 		/// Returns the account associated with the private key that was used to calculate the signature in
 		/// `personal_sign`.
 		#[rpc(name = "personal_ecRecover")]

util/EIP-712/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "eip712"
+version = "0.1.0"
+authors = ["Parity Technologies <[email protected]>"]
+
+[dependencies]
+serde_derive = "1.0"
+serde = "1.0"
+serde_json = "1.0"
+ethabi = "6.0"
+keccak-hash = "0.1"
+ethereum-types = "0.4"
+failure = "0.1"
+itertools = "0.7"
+failure_derive = "0.1"
+lazy_static = "1.1"
+toolshed = "0.4"
+regex = "1.0"
+validator = "0.8"
+validator_derive = "0.8"
+lunarity-lexer = "0.1"
+rustc-hex = "2.0"
+indexmap = "1.0.2"

util/EIP-712/src/eip712.rs

@@ -0,0 +1,177 @@
+// Copyright 2015-2018 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/>.
+
+//! EIP712 structs
+use serde_json::{Value};
+use std::collections::HashMap;
+use ethereum_types::{U256, H256, Address};
+use regex::Regex;
+use validator::Validate;
+use validator::ValidationErrors;
+
+pub(crate) type MessageTypes = HashMap<String, Vec<FieldType>>;
+
+lazy_static! {
+	// match solidity identifier with the addition of '[(\d)*]*'
+	static ref TYPE_REGEX: Regex = Regex::new(r"^[a-zA-Z_$][a-zA-Z_$0-9]*(\[([1-9]\d*)*\])*$").unwrap();
+	static ref IDENT_REGEX: Regex = Regex::new(r"^[a-zA-Z_$][a-zA-Z_$0-9]*$").unwrap();
+}
+
+#[serde(rename_all = "camelCase")]
+#[serde(deny_unknown_fields)]
+#[derive(Deserialize, Serialize, Validate, Debug, Clone)]
+pub(crate) struct EIP712Domain {
+	pub(crate) name: String,
+	pub(crate) version: String,
+	pub(crate) chain_id: U256,
+	pub(crate) verifying_contract: Address,
+	#[serde(skip_serializing_if="Option::is_none")]
+	pub(crate) salt: Option<H256>,
+}
+/// EIP-712 struct
+#[serde(rename_all = "camelCase")]
+#[serde(deny_unknown_fields)]
+#[derive(Deserialize, Debug, Clone)]
+pub struct EIP712 {
+	pub(crate) types: MessageTypes,
+	pub(crate) primary_type: String,
+	pub(crate) message: Value,
+	pub(crate) domain: EIP712Domain,
+}
+
+impl Validate for EIP712 {
+	fn validate(&self) -> Result<(), ValidationErrors> {
+		for field_types in self.types.values() {
+			for field_type in field_types {
+				field_type.validate()?;
+			}
+		}
+		Ok(())
+	}
+}
+
+#[derive(Serialize, Deserialize, Validate, Debug, Clone)]
+pub(crate) struct FieldType {
+	#[validate(regex = "IDENT_REGEX")]
+	pub name: String,
+	#[serde(rename = "type")]
+	#[validate(regex = "TYPE_REGEX")]
+	pub type_: String,
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use serde_json::from_str;
+
+	#[test]
+	fn test_regex() {
+		let test_cases = vec!["unint bytes32", "Seun\\[]", "byte[]uint", "byte[7[]uint][]", "Person[0]"];
+		for case in test_cases {
+			assert_eq!(TYPE_REGEX.is_match(case), false)
+		}
+
+		let test_cases = vec!["bytes32", "Foo[]", "bytes1", "bytes32[][]", "byte[9]", "contents"];
+		for case in test_cases {
+			assert_eq!(TYPE_REGEX.is_match(case), true)
+		}
+	}
+
+	#[test]
+	fn test_deserialization() {
+		let string = r#"{
+			"primaryType": "Mail",
+			"domain": {
+				"name": "Ether Mail",
+				"version": "1",
+				"chainId": "0x1",
+				"verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
+			},
+			"message": {
+				"from": {
+					"name": "Cow",
+					"wallet": "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"
+				},
+				"to": {
+					"name": "Bob",
+					"wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB"
+				},
+				"contents": "Hello, Bob!"
+			},
+			"types": {
+				"EIP712Domain": [
+					{ "name": "name", "type": "string" },
+					{ "name": "version", "type": "string" },
+					{ "name": "chainId", "type": "uint256" },
+					{ "name": "verifyingContract", "type": "address" }
+				],
+				"Person": [
+					{ "name": "name", "type": "string" },
+					{ "name": "wallet", "type": "address" }
+				],
+				"Mail": [
+					{ "name": "from", "type": "Person" },
+					{ "name": "to", "type": "Person" },
+					{ "name": "contents", "type": "string" }
+				]
+			}
+		}"#;
+		let _ = from_str::<EIP712>(string).unwrap();
+	}
+
+	#[test]
+	fn test_failing_deserialization() {
+		let string = r#"{
+			"primaryType": "Mail",
+			"domain": {
+				"name": "Ether Mail",
+				"version": "1",
+				"chainId": "0x1",
+				"verifyingContract": "0xCcCCccccCCCCcCCCCCCcCcCccCcCCCcCcccccccC"
+			},
+			"message": {
+				"from": {
+					"name": "Cow",
+					"wallet": "0xCD2a3d9F938E13CD947Ec05AbC7FE734Df8DD826"
+				},
+				"to": {
+					"name": "Bob",
+					"wallet": "0xbBbBBBBbbBBBbbbBbbBbbbbBBbBbbbbBbBbbBBbB"
+				},
+				"contents": "Hello, Bob!"
+			},
+			"types": {
+				"EIP712Domain": [
+					{ "name": "name", "type": "string" },
+					{ "name": "version", "type": "string" },
+					{ "name": "chainId", "type": "7uint256[x] Seun" },
+					{ "name": "verifyingContract", "type": "address" }
+				],
+				"Person": [
+					{ "name": "name", "type": "string" },
+					{ "name": "wallet amen", "type": "address" }
+				],
+				"Mail": [
+					{ "name": "from", "type": "Person" },
+					{ "name": "to", "type": "Person" },
+					{ "name": "contents", "type": "string" }
+				]
+			}
+		}"#;
+		let data = from_str::<EIP712>(string).unwrap();
+		assert_eq!(data.validate().is_err(), true);
+	}
+}