added 'debug' method to service builder

src/main/java/org/scribe/oauth/OAuth10aServiceImpl.java

@@ -4,6 +4,7 @@ import java.util.*;
 
 import org.scribe.builder.api.*;
 import org.scribe.model.*;
+import org.scribe.utils.*;
 
 /**
  * OAuth 1.0a implementation of {@link OAuthService}
@@ -34,12 +35,21 @@ public class OAuth10aServiceImpl implements OAuthService
    */
   public Token getRequestToken()
   {
+    config.log("obtaining request token from " + api.getRequestTokenEndpoint());
     OAuthRequest request = new OAuthRequest(api.getRequestTokenVerb(), api.getRequestTokenEndpoint());
+
+    config.log("setting oauth_callback to " + config.getCallback());
     request.addOAuthParameter(OAuthConstants.CALLBACK, config.getCallback());
     addOAuthParams(request, OAuthConstants.EMPTY_TOKEN);
-    addSignature(request);
+    appendSignature(request);
+
+    config.log("sending request...");
     Response response = request.send();
-    return api.getRequestTokenExtractor().extract(response.getBody());
+    String body = response.getBody();
+
+    config.log("response status code: " + response.getCode());
+    config.log("response body: " + body);
+    return api.getRequestTokenExtractor().extract(body);
   }
 
   private void addOAuthParams(OAuthRequest request, Token token)
@@ -51,6 +61,8 @@ public class OAuth10aServiceImpl implements OAuthService
     request.addOAuthParameter(OAuthConstants.VERSION, getVersion());
     if(config.hasScope()) request.addOAuthParameter(OAuthConstants.SCOPE, config.getScope());
     request.addOAuthParameter(OAuthConstants.SIGNATURE, getSignature(request, token));
+
+    config.log("appended additional OAuth parameters: " + MapUtils.toString(request.getOauthParameters()));
   }
 
   /**
@@ -58,11 +70,14 @@ public class OAuth10aServiceImpl implements OAuthService
    */
   public Token getAccessToken(Token requestToken, Verifier verifier)
   {
+    config.log("obtaining access token from " + api.getAccessTokenEndpoint());
     OAuthRequest request = new OAuthRequest(api.getAccessTokenVerb(), api.getAccessTokenEndpoint());
     request.addOAuthParameter(OAuthConstants.TOKEN, requestToken.getToken());
     request.addOAuthParameter(OAuthConstants.VERIFIER, verifier.getValue());
+
+    config.log("setting token to: " + requestToken + " and verifier to: " + verifier);
     addOAuthParams(request, requestToken);
-    addSignature(request);
+    appendSignature(request);
     Response response = request.send();
     return api.getAccessTokenExtractor().extract(response.getBody());
   }
@@ -72,9 +87,12 @@ public class OAuth10aServiceImpl implements OAuthService
    */
   public void signRequest(Token token, OAuthRequest request)
   {
+    config.log("signing request: " + request.getCompleteUrl());
     request.addOAuthParameter(OAuthConstants.TOKEN, token.getToken());
+
+    config.log("setting token to: " + token);
     addOAuthParams(request, token);
-    addSignature(request);
+    appendSignature(request);
   }
 
   /**
@@ -95,19 +113,28 @@ public class OAuth10aServiceImpl implements OAuthService
   
   private String getSignature(OAuthRequest request, Token token)
   {
+    config.log("generating signature...");
     String baseString = api.getBaseStringExtractor().extract(request);
-    return api.getSignatureService().getSignature(baseString, config.getApiSecret(), token.getSecret());
+    String signature = api.getSignatureService().getSignature(baseString, config.getApiSecret(), token.getSecret());
+
+    config.log("base string is: " + baseString);
+    config.log("signature is: " + signature);
+    return signature;
   }
 
-  private void addSignature(OAuthRequest request)
+  private void appendSignature(OAuthRequest request)
   {
     switch (config.getSignatureType())
     {
       case Header:
+        config.log("using Http Header signature");
+
         String oauthHeader = api.getHeaderExtractor().extract(request);
         request.addHeader(OAuthConstants.HEADER, oauthHeader);
         break;
       case QueryString:
+        config.log("using Querystring signature");
+
         for (Map.Entry<String, String> entry : request.getOauthParameters().entrySet())
         {
           request.addQuerystringParameter(entry.getKey(), entry.getValue());