Add explicit charset to occurrences of getBytes()

lib/src/main/java/io/ably/lib/http/Http.java

@@ -10,6 +10,7 @@
 import java.net.MalformedURLException;
 import java.net.Proxy;
 import java.net.URL;
+import java.nio.charset.StandardCharsets;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
@@ -121,7 +122,7 @@ public static class JSONRequestBody implements RequestBody {
 		public JSONRequestBody(Object ob) { this(Serialisation.gson.toJson(ob)); }
 
 		@Override
-		public byte[] getEncoded() { return (bytes != null) ? bytes : (bytes = jsonText.getBytes()); }
+		public byte[] getEncoded() { return (bytes != null) ? bytes : (bytes = jsonText.getBytes(StandardCharsets.UTF_8)); }
 		@Override
 		public String getContentType() { return JSON; }
 

lib/src/main/java/io/ably/lib/rest/Auth.java

@@ -1,5 +1,6 @@
 package io.ably.lib.rest;
 
+import java.nio.charset.StandardCharsets;
 import java.security.GeneralSecurityException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -740,8 +741,8 @@ public void onAuthError(ErrorInfo err) {
 	private static final String hmac(String text, String key) {
 		try {
 			Mac mac = Mac.getInstance("HmacSHA256");
-			mac.init(new SecretKeySpec(key.getBytes(), "HmacSHA256"));
-			return new String(Base64Coder.encode(mac.doFinal(text.getBytes())));
+			mac.init(new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "HmacSHA256"));
+			return new String(Base64Coder.encode(mac.doFinal(text.getBytes(StandardCharsets.UTF_8))));
 		} catch (GeneralSecurityException e) { Log.e("Auth.hmac", "Unexpected exception", e); return null; }
 	}
 

lib/src/main/java/io/ably/lib/types/ProtocolSerializer.java

@@ -2,6 +2,7 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 
 import org.msgpack.core.MessagePacker;
 import org.msgpack.core.MessageUnpacker;
@@ -51,6 +52,6 @@ public static ProtocolMessage fromJSON(String packed) throws AblyException {
 	 ****************************************/
 
 	public static byte[] writeJSON(ProtocolMessage message) throws AblyException {
-		return Serialisation.gson.toJson(message).getBytes();
+		return Serialisation.gson.toJson(message).getBytes(StandardCharsets.UTF_8);
 	}
 }

lib/src/main/java/io/ably/lib/util/Base64Coder.java

@@ -1,5 +1,7 @@
 package io.ably.lib.util;
 
+import java.nio.charset.StandardCharsets;
+
 //Copyright 2003-2010 Christian d'Heureuse, Inventec Informatik AG, Zurich, Switzerland
 //www.source-code.biz, www.inventec.ch/chdh
 //
@@ -52,7 +54,7 @@ public class Base64Coder {
 * @return   A String containing the Base64 encoded data.
 */
 public static String encodeString (String s) {
-return new String(encode(s.getBytes())); }
+return new String(encode(s.getBytes(StandardCharsets.UTF_8))); }
 
 /**
 * Encodes a byte array into Base 64 format and breaks the output into lines of 76 characters.