Add rustls support behind a non-default feature.

.travis.yml

@@ -36,7 +36,7 @@ script:
   - cargo fmt -- --check
 
   # Check "no default features"
-  - cargo build --verbose --workspace --exclude binary_size --no-default-features
+  - cargo build --verbose --workspace --exclude binary_size --no-default-features --features default-tls
 
   # Check "full/blocking"
   - cargo build --verbose --workspace --exclude binary_size
@@ -45,3 +45,7 @@ script:
   # Check "full/async
   - cargo build --verbose --features async --workspace --exclude binary_size
   - cargo test --verbose --features async --example async_create_charge
+
+  # Check "rustls-tls"
+  - cargo build --verbose --no-default-features --features "full webhook-events blocking rustls-tls" --workspace --exclude binary_size
+  - cargo test --verbose --no-default-features --features "full webhook-events blocking rustls-tls" --workspace --exclude binary_size

Cargo.toml

@@ -26,7 +26,7 @@ travis-ci = {repository = "wyyerd/stripe-rs"}
 name = "stripe"
 
 [features]
-default = ["full", "webhook-events", "blocking"]
+default = ["full", "webhook-events", "blocking", "default-tls"]
 full = [
 #    "core",
 #    "payment-methods",
@@ -63,12 +63,16 @@ webhooks = ["webhook-endpoints", "webhook-events"]
 blocking = ["tokio/rt-core"]
 async = []
 
+default-tls = ["hyper-tls"]
+rustls-tls = ["hyper-rustls"]
+
 [dependencies]
 chrono = { version = "0.4", features = ["serde"] }
 futures-util = { version = "0.3.1", default-features = false }
 http = "0.2.0"
 hyper = { version = "0.13", default-features = false, features = ["tcp"] }
-hyper-tls = "0.4.0"
+hyper-tls = { version = "0.4", optional = true }
+hyper-rustls = { version = "0.19", optional = true }
 serde = "1.0.79" # N.B. we use `serde(other)` which was introduced in `1.0.79`
 serde_derive = "1.0.79"
 serde_json = "1.0"

src/client/async.rs

@@ -8,8 +8,16 @@ use serde::de::DeserializeOwned;
 use std::future::Future;
 use std::pin::Pin;
 
-type HttpClient =
-    hyper::Client<hyper_tls::HttpsConnector<hyper::client::HttpConnector>, hyper::Body>;
+#[cfg(feature = "rustls-tls")]
+use hyper_rustls::HttpsConnector;
+#[cfg(feature = "default-tls")]
+use hyper_tls::HttpsConnector;
+#[cfg(all(feature = "default-tls", feature = "rustls-tls"))]
+compile_error!("You must enable only one TLS implementation");
+#[cfg(not(any(feature = "default-tls", feature = "rustls-tls")))]
+compile_error!("You must enable at least one TLS implementation");
+
+type HttpClient = hyper::Client<HttpsConnector<hyper::client::HttpConnector>, hyper::Body>;
 
 pub type Response<T> = Pin<Box<dyn Future<Output = Result<T, Error>> + Send>>;
 
@@ -44,7 +52,7 @@ impl Client {
     pub fn from_url(scheme_host: impl Into<String>, secret_key: impl Into<String>) -> Client {
         let url = scheme_host.into();
         let host = if url.ends_with('/') { format!("{}v1", url) } else { format!("{}/v1", url) };
-        let https = hyper_tls::HttpsConnector::new();
+        let https = HttpsConnector::new();
         let client = hyper::Client::builder().build(https);
         let mut headers = Headers::default();
         // TODO: Automatically determine the latest supported api version in codegen?