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use maidsafe_utilities::serialisation::serialise;
use rust_sodium::crypto::sign::{self, PublicKey, SecretKey, Signature};
use std::fmt::{self, Debug, Formatter};
use xor_name::XorName;
use data::DataIdentifier;
use error::RoutingError;
pub const MAX_STRUCTURED_DATA_SIZE_IN_BYTES: usize = 102400;
#[derive(Hash, Eq, PartialEq, PartialOrd, Ord, Clone, RustcDecodable, RustcEncodable)]
pub struct StructuredData {
type_tag: u64,
name: XorName,
data: Vec<u8>,
previous_owner_keys: Vec<PublicKey>,
version: u64,
current_owner_keys: Vec<PublicKey>,
previous_owner_signatures: Vec<Signature>,
}
impl StructuredData {
pub fn new(type_tag: u64,
name: XorName,
version: u64,
data: Vec<u8>,
current_owner_keys: Vec<PublicKey>,
previous_owner_keys: Vec<PublicKey>,
signing_key: Option<&SecretKey>)
-> Result<StructuredData, RoutingError> {
let mut structured_data = StructuredData {
type_tag: type_tag,
name: name,
data: data,
previous_owner_keys: previous_owner_keys,
version: version,
current_owner_keys: current_owner_keys,
previous_owner_signatures: vec![],
};
if let Some(key) = signing_key {
let _ = try!(structured_data.add_signature(key));
}
Ok(structured_data)
}
pub fn replace_with_other(&mut self, other: StructuredData) -> Result<(), RoutingError> {
try!(self.validate_self_against_successor(&other));
self.type_tag = other.type_tag;
self.name = other.name;
self.data = other.data;
self.previous_owner_keys = other.previous_owner_keys;
self.version = other.version;
self.current_owner_keys = other.current_owner_keys;
self.previous_owner_signatures = other.previous_owner_signatures;
Ok(())
}
pub fn name(&self) -> &XorName {
&self.name
}
pub fn identifier(&self) -> DataIdentifier {
DataIdentifier::Structured(self.name, self.type_tag)
}
pub fn validate_self_against_successor(&self,
other: &StructuredData)
-> Result<(), RoutingError> {
let owner_keys_to_match = if other.previous_owner_keys.is_empty() {
&other.current_owner_keys
} else {
&other.previous_owner_keys
};
if other.type_tag != self.type_tag || other.name != self.name ||
other.version != self.version + 1 ||
*owner_keys_to_match != self.current_owner_keys {
return Err(RoutingError::UnknownMessageType);
}
other.verify_previous_owner_signatures(owner_keys_to_match)
}
fn verify_previous_owner_signatures(&self,
owner_keys: &[PublicKey])
-> Result<(), RoutingError> {
for (i, sig) in self.previous_owner_signatures.iter().enumerate() {
for sig_check in &self.previous_owner_signatures[..i] {
if sig == sig_check {
return Err(RoutingError::DuplicateSignatures);
}
}
}
if self.previous_owner_signatures.len() < (owner_keys.len() + 1) / 2 {
return Err(RoutingError::NotEnoughSignatures);
}
let data = try!(self.data_to_sign());
let check_all_keys = |&sig| {
owner_keys.iter()
.any(|ref pub_key| sign::verify_detached(&sig, &data, pub_key))
};
if self.previous_owner_signatures
.iter()
.filter(|&sig| check_all_keys(sig))
.count() < (owner_keys.len() / 2 + owner_keys.len() % 2) {
return Err(RoutingError::NotEnoughSignatures);
}
Ok(())
}
fn data_to_sign(&self) -> Result<Vec<u8>, RoutingError> {
let sd = SerialisableStructuredData {
type_tag: self.type_tag.to_string().as_bytes().to_vec(),
name: self.name,
data: &self.data,
previous_owner_keys: &self.previous_owner_keys,
current_owner_keys: &self.current_owner_keys,
version: self.version.to_string().as_bytes().to_vec(),
};
serialise(&sd).map_err(From::from)
}
pub fn add_signature(&mut self, secret_key: &SecretKey) -> Result<usize, RoutingError> {
let data = try!(self.data_to_sign());
let sig = sign::sign_detached(&data, secret_key);
self.previous_owner_signatures.push(sig);
let owner_keys = if self.previous_owner_keys.is_empty() {
&self.current_owner_keys
} else {
&self.previous_owner_keys
};
Ok(((owner_keys.len() / 2) + 1).saturating_sub(self.previous_owner_signatures.len()))
}
pub fn replace_signatures(&mut self, new_signatures: Vec<Signature>) {
self.previous_owner_signatures = new_signatures;
}
pub fn get_type_tag(&self) -> u64 {
self.type_tag
}
pub fn get_data(&self) -> &Vec<u8> {
&self.data
}
pub fn get_previous_owner_keys(&self) -> &Vec<PublicKey> {
&self.previous_owner_keys
}
pub fn get_version(&self) -> u64 {
self.version
}
pub fn get_owner_keys(&self) -> &Vec<PublicKey> {
&self.current_owner_keys
}
pub fn get_previous_owner_signatures(&self) -> &Vec<Signature> {
&self.previous_owner_signatures
}
pub fn payload_size(&self) -> usize {
self.data.len()
}
}
impl Debug for StructuredData {
fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
let previous_owner_keys: Vec<String> = self.previous_owner_keys
.iter()
.map(|pub_key| ::utils::format_binary_array(&pub_key.0))
.collect();
let current_owner_keys: Vec<String> = self.current_owner_keys
.iter()
.map(|pub_key| ::utils::format_binary_array(&pub_key.0))
.collect();
let previous_owner_signatures: Vec<String> = self.previous_owner_signatures
.iter()
.map(|signature| ::utils::format_binary_array(&signature.0[..]))
.collect();
write!(formatter,
"StructuredData {{ type_tag: {}, name: {}, data: {}, previous_owner_keys: {:?}, \
version: {}, current_owner_keys: {:?}, previous_owner_signatures: {:?} }}",
self.type_tag,
self.name(),
::utils::format_binary_array(&self.data[..]),
previous_owner_keys,
self.version,
current_owner_keys,
previous_owner_signatures)
}
}
#[derive(RustcEncodable)]
struct SerialisableStructuredData<'a> {
type_tag: Vec<u8>,
name: XorName,
data: &'a [u8],
previous_owner_keys: &'a [PublicKey],
current_owner_keys: &'a [PublicKey],
version: Vec<u8>,
}
#[cfg(test)]
mod test {
extern crate rand;
use rust_sodium::crypto::sign;
use xor_name::XorName;
#[test]
fn single_owner() {
let keys = sign::gen_keypair();
let owner_keys = vec![keys.0];
match super::StructuredData::new(0,
rand::random(),
0,
vec![],
owner_keys.clone(),
vec![],
Some(&keys.1)) {
Ok(structured_data) => {
assert_eq!(structured_data.verify_previous_owner_signatures(&owner_keys).ok(),
Some(()))
}
Err(error) => panic!("Error: {:?}", error),
}
}
#[test]
#[should_panic(expected = "assertion failed")]
fn single_owner_unsigned() {
let keys = sign::gen_keypair();
let owner_keys = vec![keys.0];
match super::StructuredData::new(0,
rand::random(),
0,
vec![],
owner_keys.clone(),
vec![],
None) {
Ok(structured_data) => {
assert_eq!(structured_data.verify_previous_owner_signatures(&owner_keys).ok(),
Some(()))
}
Err(error) => panic!("Error: {:?}", error),
}
}
#[test]
#[should_panic(expected = "assertion failed")]
fn single_owner_other_signing_key() {
let keys = sign::gen_keypair();
let owner_keys = vec![keys.0];
let other_keys = sign::gen_keypair();
match super::StructuredData::new(0,
rand::random(),
0,
vec![],
owner_keys.clone(),
vec![],
Some(&other_keys.1)) {
Ok(structured_data) => {
assert_eq!(structured_data.verify_previous_owner_signatures(&owner_keys).ok(),
Some(()))
}
Err(error) => panic!("Error: {:?}", error),
}
}
#[test]
#[should_panic(expected = "assertion failed")]
fn single_owner_other_signature() {
let keys = sign::gen_keypair();
let owner_keys = vec![keys.0];
let other_keys = sign::gen_keypair();
match super::StructuredData::new(0,
rand::random(),
0,
vec![],
owner_keys.clone(),
vec![],
None) {
Ok(mut structured_data) => {
assert_eq!(structured_data.add_signature(&other_keys.1).ok(), Some(0));
assert_eq!(structured_data.verify_previous_owner_signatures(&owner_keys).ok(),
Some(()))
}
Err(error) => panic!("Error: {:?}", error),
}
}
#[test]
fn three_owners() {
let keys1 = sign::gen_keypair();
let keys2 = sign::gen_keypair();
let keys3 = sign::gen_keypair();
let owner_keys = vec![keys1.0, keys2.0, keys3.0];
match super::StructuredData::new(0,
rand::random(),
0,
vec![],
owner_keys.clone(),
vec![],
None) {
Ok(mut structured_data) => {
assert_eq!(unwrap!(structured_data.add_signature(&keys1.1)), 1);
assert!(structured_data.verify_previous_owner_signatures(&owner_keys).is_err());
assert_eq!(unwrap!(structured_data.add_signature(&keys2.1)), 0);
assert!(structured_data.verify_previous_owner_signatures(&owner_keys).is_ok());
assert_eq!(unwrap!(structured_data.add_signature(&keys3.1)), 0);
assert!(structured_data.verify_previous_owner_signatures(&owner_keys).is_ok());
}
Err(error) => panic!("Error: {:?}", error),
}
}
#[test]
fn four_owners() {
let keys1 = sign::gen_keypair();
let keys2 = sign::gen_keypair();
let keys3 = sign::gen_keypair();
let keys4 = sign::gen_keypair();
let owner_keys = vec![keys1.0, keys2.0, keys3.0, keys4.0];
match super::StructuredData::new(0,
rand::random(),
0,
vec![],
owner_keys.clone(),
vec![],
Some(&keys1.1)) {
Ok(mut structured_data) => {
assert_eq!(unwrap!(structured_data.add_signature(&keys2.1)), 1);
assert!(structured_data.verify_previous_owner_signatures(&owner_keys).is_ok());
assert_eq!(unwrap!(structured_data.add_signature(&keys3.1)), 0);
assert!(structured_data.verify_previous_owner_signatures(&owner_keys).is_ok());
assert_eq!(unwrap!(structured_data.add_signature(&keys4.1)), 0);
assert!(structured_data.verify_previous_owner_signatures(&owner_keys).is_ok());
}
Err(error) => panic!("Error: {:?}", error),
}
}
#[test]
fn transfer_owners() {
let keys1 = sign::gen_keypair();
let keys2 = sign::gen_keypair();
let keys3 = sign::gen_keypair();
let new_owner = sign::gen_keypair();
let identifier: XorName = rand::random();
match super::StructuredData::new(0,
identifier,
0,
vec![],
vec![keys1.0, keys2.0, keys3.0],
vec![],
Some(&keys1.1)) {
Ok(mut orig_structured_data) => {
assert_eq!(orig_structured_data.add_signature(&keys2.1).ok(), Some(0));
match super::StructuredData::new(0,
identifier,
1,
vec![],
vec![new_owner.0],
vec![keys1.0, keys2.0, keys3.0],
Some(&keys1.1)) {
Ok(mut new_structured_data) => {
assert_eq!(new_structured_data.add_signature(&keys2.1).ok(), Some(0));
match orig_structured_data.replace_with_other(new_structured_data) {
Ok(()) => (),
Err(e) => panic!("Error {:?}", e),
}
match super::StructuredData::new(0,
identifier,
2,
vec![],
vec![keys1.0],
vec![new_owner.0],
Some(&new_owner.1)) {
Ok(another_new_structured_data) => {
match orig_structured_data.replace_with_other(
another_new_structured_data) {
Ok(()) => (),
Err(e) => panic!("Error {:?}", e),
}
}
Err(error) => panic!("Error: {:?}", error),
}
}
Err(error) => panic!("Error: {:?}", error),
}
}
Err(error) => panic!("Error: {:?}", error),
}
}
}