Adding user agent string/

Author: dgollahon

src/main/java/com/blockscore/common/Constants.java

@@ -9,7 +9,8 @@ public final class Constants {
   public static final String AUTHORIZATION_HEADER = "Authorization";
   public static final String ACCEPT_HEADER = "Accept";
   public static final String BLOCKSCORE_DOMAIN = "https://api.blockscore.com";
-  
+  public static final String USER_AGENT = "blockscore-java/4.0.0 (https://github.com/BlockScore/blockscore-java)";
+
   private static final String VERSION_CODE = "4";
   private static final String ACCEPT_CONTENTS = "application/vnd.blockscore+json;version=%s";
 

src/main/java/com/blockscore/net/BlockscoreApiClient.java

@@ -16,7 +16,8 @@
 import retrofit.converter.JacksonConverter;
 
 import java.io.UnsupportedEncodingException;
-import java.util.Base64;
+
+import javax.xml.bind.DatatypeConverter;
 
 /**
  * The Blockscore Java API client.
@@ -152,7 +153,7 @@ public PaginatedResult<Candidate> listCandidates() {
   @NotNull
   private String getEncodedAuthorization() {
     try {
-      return "Basic " + Base64.getEncoder().encodeToString(apiKey.getBytes("utf-8"));
+      return "Basic " + DatatypeConverter.printBase64Binary(apiKey.getBytes("UTF-8"));
     } catch (UnsupportedEncodingException e) {
       throw new RuntimeException(e);
     }

src/main/java/com/blockscore/net/BlockscoreHttpClient.java

@@ -1,5 +1,8 @@
 package com.blockscore.net;
 
+import com.blockscore.common.Constants;
+import com.blockscore.net.UserAgentInterceptor;
+
 import com.squareup.okhttp.OkHttpClient;
 import com.squareup.okhttp.OkUrlFactory;
 import retrofit.client.Request;
@@ -28,6 +31,7 @@ private OkHttpClient generateDefaultHttpClient() {
     OkHttpClient client = new OkHttpClient();
     client.setConnectTimeout(CONNECT_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS);
     client.setReadTimeout(READ_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS);
+    client.networkInterceptors().add(new UserAgentInterceptor(Constants.USER_AGENT));
     return client;
   }
 

src/main/java/com/blockscore/net/UserAgentInterceptor.java

@@ -0,0 +1,28 @@
+package com.blockscore.net;
+
+import com.squareup.okhttp.Interceptor;
+import com.squareup.okhttp.Interceptor.Chain;
+import com.squareup.okhttp.Response;
+import com.squareup.okhttp.Request;
+
+import java.io.IOException;
+
+class UserAgentInterceptor implements Interceptor {
+
+  private final String userAgent;
+
+  public UserAgentInterceptor(String userAgent) {
+    this.userAgent = userAgent;
+  }
+
+  @Override
+  public Response intercept(Chain chain) throws IOException {
+    Request originalRequest = chain.request();
+    Request requestWithUserAgent =
+                originalRequest.newBuilder()
+                               .removeHeader("User-Agent")
+                               .addHeader("User-Agent", userAgent)
+                               .build();
+    return chain.proceed(requestWithUserAgent);
+  }
+}