started webfinger client

openid-connect-client/src/main/java/org/mitre/openid/connect/client/service/impl/WebfingerIssuerService.java

@@ -0,0 +1,112 @@
+/**
+ * 
+ */
+package org.mitre.openid.connect.client.service.impl;
+
+import java.util.concurrent.ExecutionException;
+
+import javax.servlet.http.HttpServletRequest;
+
+import org.apache.http.client.HttpClient;
+import org.apache.http.impl.client.DefaultHttpClient;
+import org.mitre.openid.connect.client.model.IssuerServiceResponse;
+import org.mitre.openid.connect.client.service.IssuerService;
+import org.mitre.openid.connect.config.ServerConfiguration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
+import org.springframework.web.client.RestTemplate;
+
+import com.google.common.base.Strings;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+
+/**
+ * Use Webfinger to discover the appropriate issuer for a user-given input string.
+ * @author jricher
+ *
+ */
+public class WebfingerIssuerService implements IssuerService {
+
+	private static Logger logger = LoggerFactory.getLogger(WebfingerIssuerService.class);
+	
+	// map of user input -> issuer, loaded dynamically from webfinger discover
+	private LoadingCache<String, String> issuers;
+
+	private String parameterName = "login";
+	
+	public WebfingerIssuerService() {
+		issuers = CacheBuilder.newBuilder().build(new WebfingerIssuerFetcher());
+	}
+	
+	/* (non-Javadoc)
+	 * @see org.mitre.openid.connect.client.service.IssuerService#getIssuer(javax.servlet.http.HttpServletRequest)
+	 */
+	@Override
+	public IssuerServiceResponse getIssuer(HttpServletRequest request) {
+		
+		String login = request.getParameter(parameterName);
+		if (!Strings.isNullOrEmpty(login)) {
+            try {
+            	String issuer = issuers.get(normalizeResource(login));
+            	return new IssuerServiceResponse(issuer, null, null);
+            } catch (ExecutionException e) {
+            	logger.warn("Issue fetching issuer for user input: " + login, e);
+	            return null;
+            }
+            
+		} else {
+			logger.warn("No user input given.");
+			return null;
+		}
+	}
+	
+	/**
+	 * Normalize the resource string as per OIDC Discovery.
+	 * @param resource
+	 * @return
+	 */
+	private String normalizeResource(String resource) {
+		// TODO
+		return null;
+	}
+
+	
+	/**
+	 * @return the parameterName
+	 */
+	public String getParameterName() {
+		return parameterName;
+	}
+
+	/**
+	 * @param parameterName the parameterName to set
+	 */
+	public void setParameterName(String parameterName) {
+		this.parameterName = parameterName;
+	}
+
+
+	/**
+     * @author jricher
+     *
+     */
+    private class WebfingerIssuerFetcher extends CacheLoader<String, String> {
+    	private HttpClient httpClient = new DefaultHttpClient();
+    	private HttpComponentsClientHttpRequestFactory httpFactory = new HttpComponentsClientHttpRequestFactory(httpClient);
+    	private RestTemplate restTemplate = new RestTemplate(httpFactory);
+		/* (non-Javadoc)
+		 * @see com.google.common.cache.CacheLoader#load(java.lang.Object)
+		 */
+        @Override
+        public String load(String key) throws Exception {
+	        // TODO Auto-generated method stub
+	        return null;
+        }
+
+    }
+
+	
+	
+}