Add Networking trait to abstract net implementation from library

Cargo.toml

@@ -19,3 +19,4 @@ time = "0.2"
 # TODO: reduce feature set to just the ones needed
 tokio = { version = "1.20", features = ["full"] }
 hyper = { version = "0.14", features = ["full"] }
+async-trait = "0.1.68"

src/bin/lox_client.rs

@@ -2,6 +2,9 @@
 #[path = "../client_lib.rs"]
 mod client_lib;
 use client_lib::*;
+#[path = "../client_net.rs"]
+mod client_net;
+use client_net::HyperNet;
 
 use curve25519_dalek::scalar::Scalar;
 use getopts::Options;
@@ -53,10 +56,14 @@ async fn main() {
         return;
     }
 
-    let server_addr = if matches.opt_present("server") {
-        matches.opt_str("server").unwrap()
+    let net = if matches.opt_present("server") {
+        HyperNet {
+            hostname: matches.opt_str("server").unwrap(),
+        }
     } else {
-        "http://localhost:8001".to_string()
+        HyperNet {
+            hostname: "http://localhost:8001".to_string(),
+        }
     };
 
     // Get Lox Authority public keys
@@ -69,7 +76,7 @@ async fn main() {
         serde_json::from_reader(lox_auth_pubkeys_infile).unwrap()
     } else {
         // download from Lox Auth
-        let pubkeys = get_lox_auth_keys(&server_addr).await;
+        let pubkeys = get_lox_auth_keys(&net).await;
         // save to file for next time
         save_object(&pubkeys, &lox_auth_pubkeys_filename);
         pubkeys
@@ -83,9 +90,9 @@ async fn main() {
         || !Path::new(bridgeline_filename).exists()
     {
         // get new Lox Credential
-        let open_invite = get_open_invitation(&server_addr).await;
+        let open_invite = get_open_invitation(&net).await;
         let (cred, bl) =
-            get_lox_credential(&server_addr, &open_invite, get_lox_pub(&lox_auth_pubkeys)).await;
+            get_lox_credential(&net, &open_invite, get_lox_pub(&lox_auth_pubkeys)).await;
 
         // save to files for next time
         save_object(&cred, &lox_cred_filename);
@@ -104,9 +111,9 @@ async fn main() {
         // If trust level is 0, do trust promotion, otherwise level up.
         let cred = if old_level == 0 {
             let migration_cred =
-                trust_promotion(&server_addr, &lox_cred, get_lox_pub(&lox_auth_pubkeys)).await;
+                trust_promotion(&net, &lox_cred, get_lox_pub(&lox_auth_pubkeys)).await;
             let cred = trust_migration(
-                &server_addr,
+                &net,
                 &lox_cred,
                 &migration_cred,
                 get_lox_pub(&lox_auth_pubkeys),
@@ -115,9 +122,9 @@ async fn main() {
             .await;
             cred
         } else {
-            let encbuckets = get_reachability_credential(&server_addr).await;
+            let encbuckets = get_reachability_credential(&net).await;
             let cred = level_up(
-                &server_addr,
+                &net,
                 &lox_cred,
                 &encbuckets,
                 get_lox_pub(&lox_auth_pubkeys),

src/client_lib.rs

@@ -1,6 +1,4 @@
-mod client_net;
-use client_net::net_request;
-
+use async_trait::async_trait;
 use curve25519_dalek::scalar::Scalar;
 use lox::bridge_table::BridgeLine;
 use lox::bridge_table::ENC_BUCKET_BYTES;
@@ -14,6 +12,12 @@ use std::time::Duration;
 // used for testing function
 use std::io::Write;
 
+// provides a generic way to make network requests
+#[async_trait]
+pub trait Networking {
+    async fn request(&self, endpoint: String, body: Vec<u8>) -> Vec<u8>;
+}
+
 // From https://gitlab.torproject.org/onyinyang/lox-server/-/blob/main/src/main.rs
 // TODO: Move this to main Lox library?
 #[serde_as]
@@ -99,35 +103,35 @@ pub fn get_cred_trust_level(cred: &lox::cred::Lox) -> i8 {
 }
 
 // Download Lox Auth pubkeys
-pub async fn get_lox_auth_keys(server_addr: &str) -> Vec<IssuerPubKey> {
-    let resp = net_request(server_addr.to_string() + "/pubkeys", [].to_vec()).await;
+pub async fn get_lox_auth_keys(net: &dyn Networking) -> Vec<IssuerPubKey> {
+    let resp = net.request("/pubkeys".to_string(), [].to_vec()).await;
     let lox_auth_pubkeys: Vec<IssuerPubKey> = serde_json::from_slice(&resp).unwrap();
     lox_auth_pubkeys
 }
 
 // Get encrypted bridge table
-pub async fn get_reachability_credential(server_addr: &str) -> Vec<[u8; ENC_BUCKET_BYTES]> {
-    let resp = net_request(server_addr.to_string() + "/reachability", [].to_vec()).await;
+pub async fn get_reachability_credential(net: &dyn Networking) -> Vec<[u8; ENC_BUCKET_BYTES]> {
+    let resp = net.request("/reachability".to_string(), [].to_vec()).await;
     let reachability_cred: EncBridgeTable = serde_json::from_slice(&resp).unwrap();
     reachability_cred.etable
 }
 
 // Get an open invitation
-pub async fn get_open_invitation(server_addr: &str) -> [u8; OPENINV_LENGTH] {
-    let resp = net_request(server_addr.to_string() + "/invite", [].to_vec()).await;
+pub async fn get_open_invitation(net: &dyn Networking) -> [u8; OPENINV_LENGTH] {
+    let resp = net.request("/invite".to_string(), [].to_vec()).await;
     let open_invite: [u8; OPENINV_LENGTH] = serde_json::from_slice::<Invite>(&resp).unwrap().invite;
     open_invite
 }
 
 // Get a Lox Credential from an open invitation
 pub async fn get_lox_credential(
-    server_addr: &str,
+    net: &dyn Networking,
     open_invite: &[u8; OPENINV_LENGTH],
     lox_pub: &IssuerPubKey,
 ) -> (lox::cred::Lox, BridgeLine) {
     let (req, state) = open_invite::request(&open_invite);
     let encoded_req: Vec<u8> = serde_json::to_vec(&req).unwrap();
-    let encoded_resp = net_request(server_addr.to_string() + "/openreq", encoded_req).await;
+    let encoded_resp = net.request("/openreq".to_string(), encoded_req).await;
     let decoded_resp: open_invite::Response = serde_json::from_slice(&encoded_resp).unwrap();
     let (cred, bridgeline) = open_invite::handle_response(state, decoded_resp, &lox_pub).unwrap();
     (cred, bridgeline)
@@ -135,7 +139,7 @@ pub async fn get_lox_credential(
 
 // Get a migration credential to migrate to higher trust
 pub async fn trust_promotion(
-    server_addr: &str,
+    net: &dyn Networking,
     lox_cred: &lox::cred::Lox,
     lox_pub: &IssuerPubKey,
 ) -> lox::cred::Migration {
@@ -147,7 +151,7 @@ pub async fn trust_promotion(
 //        trust_promotion::request(&lox_cred, &lox_pub, today(Duration::ZERO)).unwrap();
         trust_promotion::request(&lox_cred, &lox_pub, today(Duration::from_secs(time_offset.into()))).unwrap(); // FOR TESTING ONLY
     let encoded_req: Vec<u8> = serde_json::to_vec(&req).unwrap();
-    let encoded_resp = net_request(server_addr.to_string() + "/trustpromo", encoded_req).await;
+    let encoded_resp = net.request("/trustpromo".to_string(), encoded_req).await;
     let decoded_resp: trust_promotion::Response = serde_json::from_slice(&encoded_resp).unwrap();
     let migration_cred = trust_promotion::handle_response(state, decoded_resp).unwrap();
     migration_cred
@@ -155,7 +159,7 @@ pub async fn trust_promotion(
 
 // Promote from untrusted (trust level 0) to trusted (trust level 1)
 pub async fn trust_migration(
-    server_addr: &str,
+    net: &dyn Networking,
     lox_cred: &lox::cred::Lox,
     migration_cred: &lox::cred::Migration,
     lox_pub: &IssuerPubKey,
@@ -164,7 +168,7 @@ pub async fn trust_migration(
     let (req, state) =
         migration::request(lox_cred, migration_cred, lox_pub, migration_pub).unwrap();
     let encoded_req: Vec<u8> = serde_json::to_vec(&req).unwrap();
-    let encoded_resp = net_request(server_addr.to_string() + "/trustmig", encoded_req).await;
+    let encoded_resp = net.request("/trustmig".to_string(), encoded_req).await;
     let decoded_resp: migration::Response = serde_json::from_slice(&encoded_resp).unwrap();
     let cred = migration::handle_response(state, decoded_resp, lox_pub).unwrap();
     cred
@@ -172,7 +176,7 @@ pub async fn trust_migration(
 
 // Increase trust from at least level 1 to higher levels
 pub async fn level_up(
-    server_addr: &str,
+    net: &dyn Networking,
     lox_cred: &lox::cred::Lox,
     encbuckets: &Vec<[u8; ENC_BUCKET_BYTES]>,
     lox_pub: &IssuerPubKey,
@@ -202,7 +206,7 @@ pub async fn level_up(
     )
     .unwrap();
     let encoded_req: Vec<u8> = serde_json::to_vec(&req).unwrap();
-    let encoded_resp = net_request(server_addr.to_string() + "/levelup", encoded_req).await;
+    let encoded_resp = net.request("/levelup".to_string(), encoded_req).await;
     let decoded_resp: level_up::Response = serde_json::from_slice(&encoded_resp).unwrap();
     let cred = level_up::handle_response(state, decoded_resp, lox_pub).unwrap();
     cred
@@ -210,7 +214,7 @@ pub async fn level_up(
 
 // Request an Invitation credential to give to a friend
 pub async fn issue_invite(
-    server_addr: &str,
+    net: &dyn Networking,
     lox_cred: &lox::cred::Lox,
     encbuckets: &Vec<[u8; ENC_BUCKET_BYTES]>,
     lox_pub: &IssuerPubKey,
@@ -234,7 +238,7 @@ pub async fn issue_invite(
     )
     .unwrap();
     let encoded_req: Vec<u8> = serde_json::to_vec(&req).unwrap();
-    let encoded_resp = net_request(server_addr.to_string() + "/issueinvite", encoded_req).await;
+    let encoded_resp = net.request("/issueinvite".to_string(), encoded_req).await;
     let decoded_resp: issue_invite::Response = serde_json::from_slice(&encoded_resp).unwrap();
     let (cred, invite) =
         issue_invite::handle_response(state, decoded_resp, lox_pub, invitation_pub).unwrap();
@@ -243,7 +247,7 @@ pub async fn issue_invite(
 
 // Redeem an Invitation credential to start at trust level 1
 pub async fn redeem_invite(
-    server_addr: &str,
+    net: &dyn Networking,
     invite: &lox::cred::Invitation,
     lox_pub: &IssuerPubKey,
     invitation_pub: &IssuerPubKey,
@@ -251,7 +255,7 @@ pub async fn redeem_invite(
     let (req, state) =
         redeem_invite::request(invite, invitation_pub, today(Duration::ZERO)).unwrap();
     let encoded_req: Vec<u8> = serde_json::to_vec(&req).unwrap();
-    let encoded_resp = net_request(server_addr.to_string() + "/redeem", encoded_req).await;
+    let encoded_resp = net.request("/redeem".to_string(), encoded_req).await;
     let decoded_resp: redeem_invite::Response = serde_json::from_slice(&encoded_resp).unwrap();
     let cred = redeem_invite::handle_response(state, decoded_resp, lox_pub).unwrap();
     cred
@@ -259,13 +263,13 @@ pub async fn redeem_invite(
 
 // Check for a migration credential to move to a new bucket
 pub async fn check_blockage(
-    server_addr: &str,
+    net: &dyn Networking,
     lox_cred: &lox::cred::Lox,
     lox_pub: &IssuerPubKey,
 ) -> lox::cred::Migration {
     let (req, state) = check_blockage::request(lox_cred, lox_pub).unwrap();
     let encoded_req: Vec<u8> = serde_json::to_vec(&req).unwrap();
-    let encoded_resp = net_request(server_addr.to_string() + "/checkblockage", encoded_req).await;
+    let encoded_resp = net.request("/checkblockage".to_string(), encoded_req).await;
     let decoded_resp: check_blockage::Response = serde_json::from_slice(&encoded_resp).unwrap();
     let migcred = check_blockage::handle_response(state, decoded_resp).unwrap();
     migcred
@@ -273,7 +277,7 @@ pub async fn check_blockage(
 
 // Migrate to a new bucket (must be level >= 3)
 pub async fn blockage_migration(
-    server_addr: &str,
+    net: &dyn Networking,
     lox_cred: &lox::cred::Lox,
     migcred: &lox::cred::Migration,
     lox_pub: &IssuerPubKey,
@@ -282,8 +286,9 @@ pub async fn blockage_migration(
     let (req, state) =
         blockage_migration::request(lox_cred, migcred, lox_pub, migration_pub).unwrap();
     let encoded_req: Vec<u8> = serde_json::to_vec(&req).unwrap();
-    let encoded_resp =
-        net_request(server_addr.to_string() + "/blockagemigration", encoded_req).await;
+    let encoded_resp = net
+        .request("/blockagemigration".to_string(), encoded_req)
+        .await;
     let decoded_resp: blockage_migration::Response = serde_json::from_slice(&encoded_resp).unwrap();
     let cred = blockage_migration::handle_response(state, decoded_resp, lox_pub).unwrap();
     cred

src/client_net.rs

@@ -1,25 +1,36 @@
 // This file provides networking using hyper (which
 // https://gitlab.torproject.org/onyinyang/lox-server uses).
 
+use crate::client_lib::Networking;
+use async_trait::async_trait;
 use hyper::{Body, Client, Method, Request};
 
-pub async fn net_request(url: String, body: Vec<u8>) -> Vec<u8> {
-    let client = Client::new();
+pub struct HyperNet {
+    pub hostname: String,
+}
+
+#[async_trait]
+impl Networking for HyperNet {
+    async fn request(&self, endpoint: String, body: Vec<u8>) -> Vec<u8> {
+        let client = Client::new();
+
+        let url = self.hostname.to_string() + &endpoint;
 
-    let uri: hyper::Uri = url.parse().expect("Failed to parse URL");
+        let uri: hyper::Uri = url.parse().expect("Failed to parse URL");
 
-    // always POST even if body is empty
-    let req = Request::builder()
-        .method(Method::POST)
-        .uri(uri)
-        .body(Body::from(body))
-        .expect("Failed to create POST request");
-    let resp = client.request(req).await.expect("Failed to POST");
+        // always POST even if body is empty
+        let req = Request::builder()
+            .method(Method::POST)
+            .uri(uri)
+            .body(Body::from(body))
+            .expect("Failed to create POST request");
+        let resp = client.request(req).await.expect("Failed to POST");
 
-    println!("Response: {}", resp.status());
+        println!("Response: {}", resp.status());
 
-    let buf = hyper::body::to_bytes(resp)
-        .await
-        .expect("Failed to concat bytes");
-    buf.to_vec()
+        let buf = hyper::body::to_bytes(resp)
+            .await
+            .expect("Failed to concat bytes");
+        buf.to_vec()
+    }
 }