372 lines
11 KiB
Rust
372 lines
11 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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//! URLHint Contract
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use std::sync::Arc;
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use rustc_hex::ToHex;
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use mime::{self, Mime};
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use mime_guess;
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use hash::keccak;
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use futures::{future, Future};
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use native_contracts::{Registry, Urlhint};
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use util::Address;
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use bytes::Bytes;
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/// Boxed future that can be shared between threads.
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/// TODO [ToDr] Use concrete types!
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pub type BoxFuture<A, B> = Box<Future<Item = A, Error = B> + Send>;
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const COMMIT_LEN: usize = 20;
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/// RAW Contract interface.
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/// Should execute transaction using current blockchain state.
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pub trait ContractClient: Send + Sync {
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/// Get registrar address
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fn registrar(&self) -> Result<Address, String>;
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/// Call Contract
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fn call(&self, address: Address, data: Bytes) -> BoxFuture<Bytes, String>;
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}
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/// Github-hosted dapp.
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#[derive(Debug, PartialEq)]
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pub struct GithubApp {
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/// Github Account
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pub account: String,
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/// Github Repository
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pub repo: String,
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/// Commit on Github
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pub commit: [u8; COMMIT_LEN],
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/// Dapp owner address
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pub owner: Address,
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}
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impl GithubApp {
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/// Returns URL of this Github-hosted dapp package.
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pub fn url(&self) -> String {
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// Since https fetcher doesn't support redirections we use direct link
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// format!("https://github.com/{}/{}/archive/{}.zip", self.account, self.repo, self.commit.to_hex())
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format!("https://codeload.github.com/{}/{}/zip/{}", self.account, self.repo, self.commit.to_hex())
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}
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fn commit(bytes: &[u8]) -> Option<[u8;COMMIT_LEN]> {
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if bytes.len() < COMMIT_LEN {
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return None;
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}
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let mut commit = [0; COMMIT_LEN];
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for i in 0..COMMIT_LEN {
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commit[i] = bytes[i];
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}
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Some(commit)
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}
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}
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/// Hash-Addressed Content
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#[derive(Debug, PartialEq)]
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pub struct Content {
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/// URL of the content
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pub url: String,
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/// MIME type of the content
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pub mime: Mime,
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/// Content owner address
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pub owner: Address,
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}
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/// Result of resolving id to URL
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#[derive(Debug, PartialEq)]
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pub enum URLHintResult {
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/// Dapp
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Dapp(GithubApp),
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/// Content
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Content(Content),
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}
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/// URLHint Contract interface
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pub trait URLHint: Send + Sync {
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/// Resolves given id to registrar entry.
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fn resolve(&self, id: Bytes) -> BoxFuture<Option<URLHintResult>, String>;
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}
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/// `URLHintContract` API
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#[derive(Clone)]
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pub struct URLHintContract {
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urlhint: Arc<Urlhint>,
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registrar: Registry,
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client: Arc<ContractClient>,
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}
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impl URLHintContract {
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/// Creates new `URLHintContract`
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pub fn new(client: Arc<ContractClient>) -> Self {
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URLHintContract {
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urlhint: Arc::new(Urlhint::new(Default::default())),
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registrar: Registry::new(Default::default()),
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client: client,
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}
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}
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}
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fn decode_urlhint_output(output: (String, ::bigint::hash::H160, Address)) -> Option<URLHintResult> {
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let (account_slash_repo, commit, owner) = output;
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if owner == Address::default() {
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return None;
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}
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let commit = GithubApp::commit(&commit);
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if commit == Some(Default::default()) {
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let mime = guess_mime_type(&account_slash_repo).unwrap_or(mime::APPLICATION_JSON);
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return Some(URLHintResult::Content(Content {
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url: account_slash_repo,
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mime: mime,
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owner: owner,
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}));
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}
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let (account, repo) = {
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let mut it = account_slash_repo.split('/');
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match (it.next(), it.next()) {
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(Some(account), Some(repo)) => (account.into(), repo.into()),
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_ => return None,
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}
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};
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commit.map(|commit| URLHintResult::Dapp(GithubApp {
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account: account,
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repo: repo,
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commit: commit,
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owner: owner,
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}))
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}
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impl URLHint for URLHintContract {
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fn resolve(&self, id: Bytes) -> BoxFuture<Option<URLHintResult>, String> {
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use futures::future::Either;
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let do_call = |_, data| {
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let addr = match self.client.registrar() {
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Ok(addr) => addr,
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Err(e) => return Box::new(future::err(e))
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as BoxFuture<Vec<u8>, _>,
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};
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self.client.call(addr, data)
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};
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let urlhint = self.urlhint.clone();
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let client = self.client.clone();
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Box::new(self.registrar.get_address(do_call, keccak("githubhint"), "A".into())
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.map(|addr| if addr == Address::default() { None } else { Some(addr) })
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.and_then(move |address| {
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let mut fixed_id = [0; 32];
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let len = ::std::cmp::min(32, id.len());
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fixed_id[..len].copy_from_slice(&id[..len]);
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match address {
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None => Either::A(future::ok(None)),
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Some(address) => {
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let do_call = move |_, data| client.call(address, data);
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Either::B(urlhint.entries(do_call, ::bigint::hash::H256(fixed_id)).map(decode_urlhint_output))
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}
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}
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}))
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}
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}
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fn guess_mime_type(url: &str) -> Option<Mime> {
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const CONTENT_TYPE: &'static str = "content-type=";
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let mut it = url.split('#');
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// skip url
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let url = it.next();
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// get meta headers
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let metas = it.next();
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if let Some(metas) = metas {
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for meta in metas.split('&') {
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let meta = meta.to_lowercase();
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if meta.starts_with(CONTENT_TYPE) {
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return meta[CONTENT_TYPE.len()..].parse().ok();
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}
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}
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}
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url.and_then(|url| {
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url.split('.').last()
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}).and_then(|extension| {
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mime_guess::get_mime_type_opt(extension)
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})
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}
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#[cfg(test)]
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pub mod tests {
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use std::sync::Arc;
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use std::str::FromStr;
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use rustc_hex::FromHex;
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use futures::{Future, IntoFuture};
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use super::*;
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use super::guess_mime_type;
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use parking_lot::Mutex;
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use util::Address;
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use bytes::{Bytes, ToPretty};
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pub struct FakeRegistrar {
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pub calls: Arc<Mutex<Vec<(String, String)>>>,
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pub responses: Mutex<Vec<Result<Bytes, String>>>,
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}
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pub const REGISTRAR: &'static str = "8e4e9b13d4b45cb0befc93c3061b1408f67316b2";
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pub const URLHINT: &'static str = "deadbeefcafe0000000000000000000000000000";
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impl FakeRegistrar {
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pub fn new() -> Self {
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FakeRegistrar {
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calls: Arc::new(Mutex::new(Vec::new())),
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responses: Mutex::new(
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vec![
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Ok(format!("000000000000000000000000{}", URLHINT).from_hex().unwrap()),
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Ok(Vec::new())
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]
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),
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}
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}
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}
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impl ContractClient for FakeRegistrar {
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fn registrar(&self) -> Result<Address, String> {
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Ok(REGISTRAR.parse().unwrap())
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}
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fn call(&self, address: Address, data: Bytes) -> BoxFuture<Bytes, String> {
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self.calls.lock().push((address.to_hex(), data.to_hex()));
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let res = self.responses.lock().remove(0);
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Box::new(res.into_future())
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}
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}
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#[test]
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fn should_call_registrar_and_urlhint_contracts() {
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// given
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let registrar = FakeRegistrar::new();
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let resolve_result = {
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use ethabi::{encode, Token};
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encode(&[Token::String(String::new()), Token::FixedBytes(vec![0; 20]), Token::Address([0; 20])])
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};
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registrar.responses.lock()[1] = Ok(resolve_result);
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let calls = registrar.calls.clone();
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let urlhint = URLHintContract::new(Arc::new(registrar));
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// when
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let res = urlhint.resolve("test".bytes().collect()).wait().unwrap();
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let calls = calls.lock();
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let call0 = calls.get(0).expect("Registrar resolve called");
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let call1 = calls.get(1).expect("URLHint Resolve called");
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// then
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assert!(res.is_none());
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assert_eq!(call0.0, REGISTRAR);
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assert_eq!(call0.1,
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"6795dbcd058740ee9a5a3fb9f1cfa10752baec87e09cc45cd7027fd54708271aca300c75000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000014100000000000000000000000000000000000000000000000000000000000000".to_owned()
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);
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assert_eq!(call1.0, URLHINT);
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assert_eq!(call1.1,
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"267b69227465737400000000000000000000000000000000000000000000000000000000".to_owned()
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);
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}
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#[test]
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fn should_decode_urlhint_output() {
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// given
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let mut registrar = FakeRegistrar::new();
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registrar.responses = Mutex::new(vec![
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Ok(format!("000000000000000000000000{}", URLHINT).from_hex().unwrap()),
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Ok("0000000000000000000000000000000000000000000000000000000000000060ec4c1fe06c808fe3739858c347109b1f5f1ed4b5000000000000000000000000000000000000000000000000deadcafebeefbeefcafedeaddeedfeedffffffff0000000000000000000000000000000000000000000000000000000000000011657468636f72652f64616f2e636c61696d000000000000000000000000000000".from_hex().unwrap()),
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]);
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let urlhint = URLHintContract::new(Arc::new(registrar));
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// when
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let res = urlhint.resolve("test".bytes().collect()).wait().unwrap();
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// then
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assert_eq!(res, Some(URLHintResult::Dapp(GithubApp {
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account: "ethcore".into(),
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repo: "dao.claim".into(),
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commit: GithubApp::commit(&"ec4c1fe06c808fe3739858c347109b1f5f1ed4b5".from_hex().unwrap()).unwrap(),
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owner: Address::from_str("deadcafebeefbeefcafedeaddeedfeedffffffff").unwrap(),
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})))
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}
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#[test]
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fn should_decode_urlhint_content_output() {
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// given
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let mut registrar = FakeRegistrar::new();
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registrar.responses = Mutex::new(vec![
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Ok(format!("000000000000000000000000{}", URLHINT).from_hex().unwrap()),
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Ok("00000000000000000000000000000000000000000000000000000000000000600000000000000000000000000000000000000000000000000000000000000000000000000000000000000000deadcafebeefbeefcafedeaddeedfeedffffffff000000000000000000000000000000000000000000000000000000000000003c68747470733a2f2f7061726974792e696f2f6173736574732f696d616765732f657468636f72652d626c61636b2d686f72697a6f6e74616c2e706e6700000000".from_hex().unwrap()),
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]);
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let urlhint = URLHintContract::new(Arc::new(registrar));
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// when
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let res = urlhint.resolve("test".bytes().collect()).wait().unwrap();
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// then
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assert_eq!(res, Some(URLHintResult::Content(Content {
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url: "https://parity.io/assets/images/ethcore-black-horizontal.png".into(),
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mime: mime::IMAGE_PNG,
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owner: Address::from_str("deadcafebeefbeefcafedeaddeedfeedffffffff").unwrap(),
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})))
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}
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#[test]
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fn should_return_valid_url() {
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// given
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let app = GithubApp {
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account: "test".into(),
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repo: "xyz".into(),
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commit: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
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owner: Address::default(),
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};
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// when
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let url = app.url();
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// then
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assert_eq!(url, "https://codeload.github.com/test/xyz/zip/000102030405060708090a0b0c0d0e0f10111213".to_owned());
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}
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#[test]
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fn should_guess_mime_type_from_url() {
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let url1 = "https://parity.io/parity";
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let url2 = "https://parity.io/parity#content-type=image/png";
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let url3 = "https://parity.io/parity#something&content-type=image/png";
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let url4 = "https://parity.io/parity.png#content-type=image/jpeg";
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let url5 = "https://parity.io/parity.png";
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assert_eq!(guess_mime_type(url1), None);
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assert_eq!(guess_mime_type(url2), Some(mime::IMAGE_PNG));
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assert_eq!(guess_mime_type(url3), Some(mime::IMAGE_PNG));
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assert_eq!(guess_mime_type(url4), Some(mime::IMAGE_JPEG));
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assert_eq!(guess_mime_type(url5), Some(mime::IMAGE_PNG));
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}
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}
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