added support RFC compliant and non-compliant g1/g2 swapped beacons (#1)

- added support RFC compliant and non-compliant g1/g2 swapped beacons
- replaced BLS12-381 lib with ZKcrypto's lib as it's lower level
- changed the interface almost completely, so users don't need to know
  whether they're using a chained or unchained network
- added many tests for verification
- removed overly strict check of prev_sig on unchained beacon

.gitignore

@@ -1,2 +1,3 @@
 /target
 /Cargo.lock
+drand-client-rs.iml

Cargo.toml

@@ -7,11 +7,9 @@ edition = "2021"
 
 [dependencies]
 hex = { version = "0.4.3", features = ["serde"] }
-url = "2.3.1"
-reqwest = { version = "0.11", features = ["blocking"] }
-json = "0.12.4"
-bls-signatures = "0.13.0"
+sha2 = "0.9"
+bls12_381 = { version = "0.8.0", features = ["experimental"] }
 thiserror = "1.0.38"
-sha256 = "1.1.1"
-serde = { version = "1.0.151", features = ["derive"] }
-serde_json = "1.0.91"
+serde = { version = "1.0.187", features = ["derive"] }
+serde_json = "1.0.105"
+reqwest = { version = "0.11.20", features = ["blocking", "json"] }

src/chain_info.rs

@@ -1,9 +1,10 @@
+use crate::verify::SchemeID;
 use serde::Deserialize;
 
 #[derive(Deserialize, Debug, PartialEq, Clone)]
 pub struct ChainInfo {
     #[serde(alias = "schemeID")]
-    pub scheme_id: String,
+    pub scheme_id: SchemeID,
     #[serde(with = "hex")]
     pub public_key: Vec<u8>,
     #[serde(with = "hex", alias = "hash")]

src/http.rs

@@ -1,33 +1,31 @@
+use crate::{Transport, TransportError};
 use reqwest::blocking::Client;
 use reqwest::StatusCode;
-use thiserror::Error;
-
-#[derive(Error, Debug)]
-pub enum HttpError {
-    #[error("not found")]
-    NotFound,
-    #[error("unexpected")]
-    Unexpected,
-}
 
 pub struct HttpTransport {
     pub client: Client,
 }
 
-impl HttpTransport {
-    pub fn fetch(&self, url: &str) -> Result<String, HttpError> {
+impl Transport for HttpTransport {
+    fn fetch(&self, url: &str) -> Result<String, TransportError> {
         let res = self
             .client
             .get(url)
             .send()
-            .map_err(|_| HttpError::Unexpected)?;
+            .map_err(|_| TransportError::Unexpected)?;
 
         match res.status() {
-            StatusCode::OK => res.text().map_err(|_| HttpError::Unexpected),
+            StatusCode::OK => res.text().map_err(|_| TransportError::Unexpected),
 
-            StatusCode::NOT_FOUND => Err(HttpError::NotFound),
+            StatusCode::NOT_FOUND => Err(TransportError::NotFound),
 
-            _ => Err(HttpError::Unexpected),
+            _ => Err(TransportError::Unexpected),
         }
     }
 }
+
+pub fn new_http_transport() -> HttpTransport {
+    HttpTransport {
+        client: Client::new(),
+    }
+}