Merge pull request scribejava#290 from eranation/master

Oauth2 client for ConstantContact - fixed

src/main/java/org/scribe/builder/api/ConstantContactApi2.java

@@ -0,0 +1,56 @@
+package org.scribe.builder.api;
+
+import java.util.regex.*;
+import org.scribe.exceptions.*;
+import org.scribe.extractors.*;
+import org.scribe.model.*;
+import org.scribe.utils.*;
+
+public class ConstantContactApi2 extends DefaultApi20
+{
+  private static final String AUTHORIZE_URL = "https://oauth2.constantcontact.com/oauth2/oauth/siteowner/authorize?client_id=%s&response_type=code&redirect_uri=%s";
+
+  @Override
+  public String getAccessTokenEndpoint()
+  {
+    return "https://oauth2.constantcontact.com/oauth2/oauth/token?grant_type=authorization_code";
+  }
+
+  @Override
+  public String getAuthorizationUrl(OAuthConfig config)
+  {
+    return String.format(AUTHORIZE_URL, config.getApiKey(), OAuthEncoder.encode(config.getCallback()));
+  }
+
+  @Override
+  public Verb getAccessTokenVerb()
+  {
+    return Verb.POST;
+  }
+
+  @Override
+  public AccessTokenExtractor getAccessTokenExtractor()
+  {
+    return new AccessTokenExtractor()
+    {
+
+      @Override
+      public Token extract(String response)
+      {
+        Preconditions.checkEmptyString(response, "Response body is incorrect. Can't extract a token from an empty string");
+
+        String regex = "\"access_token\"\\s*:\\s*\"([^&\"]+)\"";
+        Matcher matcher = Pattern.compile(regex).matcher(response);
+        if (matcher.find())
+        {
+          String token = OAuthEncoder.decode(matcher.group(1));
+          return new Token(token, "", response);
+        } 
+        else
+        {
+          throw new OAuthException("Response body is incorrect. Can't extract a token from this: '" + response + "'", null);
+        }
+      }
+    };
+  }
+}