1 files changed, 117 insertions, 0 deletions
diff --git a/id.server/src/at/gv/egovernment/moa/id/auth/servlet/AuthServlet.java b/id.server/src/at/gv/egovernment/moa/id/auth/servlet/AuthServlet.java
new file mode 100644
index 000000000..3a1cab4be
--- /dev/null
+++ b/id.server/src/at/gv/egovernment/moa/id/auth/servlet/AuthServlet.java
@@ -0,0 +1,117 @@
+package at.gv.egovernment.moa.id.auth.servlet;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
+
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import at.gv.egovernment.moa.id.auth.MOAIDAuthConstants;
+import at.gv.egovernment.moa.id.auth.WrongParametersException;
+import at.gv.egovernment.moa.logging.Logger;
+import at.gv.egovernment.moa.util.URLDecoder;
+
+/**
+ * Base class for MOA-ID Auth Servlets, providing standard error handling
+ * and constant names.
+ * 
+ * @author Paul Ivancsics
+ * @version $Id$
+ */
+public class AuthServlet extends HttpServlet implements MOAIDAuthConstants {
+
+
+  /**
+   * Handles an error. <br>
+   * <ul>
+   * <li>Logs the error</li>
+   * <li>Places error message and exception thrown into the request 
+   * 		 as request attributes (to be used by <code>"/errorpage.jsp"</code>)</li>
+   * <li>Sets HTTP status 500 (internal server error)</li>
+   * </ul>
+   * 
+   * @param errorMessage error message
+   * @param exceptionThrown exception thrown
+   * @param req servlet request
+   * @param resp servlet response
+   */
+	protected void handleError(
+		String errorMessage, Throwable exceptionThrown, HttpServletRequest req, HttpServletResponse resp) {
+
+		if (exceptionThrown != null)
+			Logger.error(errorMessage, exceptionThrown);
+		else
+			Logger.error(errorMessage);
+		req.setAttribute("ErrorMessage", errorMessage);
+		req.setAttribute("ExceptionThrown", exceptionThrown);
+		resp.setStatus(500);
+	}
+  /**
+   * Handles a <code>WrongParametersException</code>.
+   * @param req servlet request
+   * @param resp servlet response
+   */
+  protected void handleWrongParameters(WrongParametersException ex, HttpServletRequest req, HttpServletResponse resp) {
+    Logger.error(ex.toString());
+    req.setAttribute("WrongParameters", "true");
+    resp.setStatus(500);
+  }
+  
+  /**
+   * Logs all servlet parameters for debugging purposes.
+   */
+  protected void logParameters(HttpServletRequest req) {
+    for (Enumeration enum = req.getParameterNames(); enum.hasMoreElements(); ) {
+      String parname = (String)enum.nextElement();
+      Logger.debug("Parameter " + parname + req.getParameter(parname));    
+    }
+  }
+  /**
+     * Parses the request input stream for parameters,
+     * assuming parameters are encoded UTF-8.
+     * @param req servlet request
+     * @return mapping parameter name -> value
+     */
+  protected Map getParameters(HttpServletRequest req) throws IOException {
+    Map parameters = new HashMap();
+    InputStream in = req.getInputStream();
+    String paramName;
+    String paramValueURLEncoded;
+    do {
+      paramName = new String(readBytesUpTo(in, '='));
+      if (paramName.length() > 0) {
+        paramValueURLEncoded = readBytesUpTo(in, '&');
+        String paramValue = URLDecoder.decode(paramValueURLEncoded, "UTF-8");
+        parameters.put(paramName, paramValue);
+      }
+    }
+    while (paramName.length() > 0);
+    in.close();
+    
+    return parameters;
+  }
+  /**
+     * Reads bytes up to a delimiter, consuming the delimiter.
+     * @param in input stream
+     * @param delimiter delimiter character
+     * @return String constructed from the read bytes
+     * @throws IOException
+     */
+  protected String readBytesUpTo(InputStream in, char delimiter) throws IOException {
+    ByteArrayOutputStream bout = new ByteArrayOutputStream();
+    boolean done = false;
+    int b;
+    while (! done && (b = in.read()) >= 0) {
+      if (b == delimiter)
+        done = true;
+      else
+        bout.write(b);
+    }
+    return bout.toString();
+  }
+}