fix(deps): Use small base64 crate instead of rustc-serialize

Cargo.toml

@@ -11,12 +11,12 @@ license = "MIT OR Apache-2.0"
 build = "src/build.rs"
 
 [dependencies]
+base64 = "0.2"
 chrono = ">= 0.2"
 hyper = "^ 0.9.0"
 itertools = ">= 0.4"
 log = ">= 0.3"
 openssl = "0.7"
-rustc-serialize = "0.3"
 serde = "0.8"
 serde_json = "0.8"
 serde_macros = { version = "0.8", optional = true }

src/lib.rs.in

@@ -1,7 +1,7 @@
 extern crate serde;
 extern crate serde_json;
-extern crate rustc_serialize;
 
+extern crate base64;
 extern crate chrono;
 extern crate openssl;
 extern crate hyper;

src/service_account.rs

@@ -24,10 +24,10 @@ use storage::{hash_scopes, MemoryStorage, TokenStorage};
 use hyper::header;
 use url::form_urlencoded;
 
+use base64;
 use chrono;
 use hyper;
 use openssl;
-use rustc_serialize;
 use serde_json;
 
 const GRANT_TYPE: &'static str = "urn:ietf:params:oauth:grant-type:jwt-bearer";
@@ -36,9 +36,7 @@ const GOOGLE_RS256_HEAD: &'static str = "{\"alg\":\"RS256\",\"typ\":\"JWT\"}";
 
 // Encodes s as Base64
 fn encode_base64<T: AsRef<[u8]>>(s: T) -> String {
-    use rustc_serialize::base64::ToBase64;
-
-    s.as_ref().to_base64(rustc_serialize::base64::URL_SAFE)
+    base64::encode(s.as_ref())
 }
 
 // Calculates the SHA256 hash.