Add a special exception type for 'unauthorized' errors

acme4j-client/src/main/java/org/shredzone/acme4j/exception/AcmeUnauthorizedException.java

@@ -0,0 +1,37 @@
+/*
+ * acme4j - Java ACME client
+ *
+ * Copyright (C) 2015 Richard "Shred" Körber
+ *   http://acme4j.shredzone.org
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ */
+package org.shredzone.acme4j.exception;
+
+/**
+ * An exception that is thrown when the client is not authorized. The details will give
+ * an explanation for the reasons (e.g. "client not on a whitelist").
+ *
+ * @author Richard "Shred" Körber
+ */
+public class AcmeUnauthorizedException extends AcmeServerException {
+    private static final long serialVersionUID = 9064697508262919366L;
+
+    /**
+     * Creates a new {@link AcmeUnauthorizedException}.
+     *
+     * @param type
+     *            System readable error type (here {@code "urn:acme:error:unauthorized"})
+     * @param detail
+     *            Human readable error message
+     */
+    public AcmeUnauthorizedException(String type, String detail) {
+        super(type, detail);
+    }
+
+}

acme4j-client/src/main/java/org/shredzone/acme4j/impl/DefaultConnection.java

@@ -44,6 +44,7 @@ import org.shredzone.acme4j.connector.Resource;
 import org.shredzone.acme4j.connector.Session;
 import org.shredzone.acme4j.exception.AcmeException;
 import org.shredzone.acme4j.exception.AcmeServerException;
+import org.shredzone.acme4j.exception.AcmeUnauthorizedException;
 import org.shredzone.acme4j.util.ClaimBuilder;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -284,7 +285,14 @@ public class DefaultConnection implements Connection {
             Map<String, Object> map = readJsonResponse();
             String type = (String) map.get("type");
             String detail = (String) map.get("detail");
-            throw new AcmeServerException(type, detail);
+
+            switch (type) {
+                case "urn:acme:error:unauthorized":
+                    throw new AcmeUnauthorizedException(type, detail);
+
+                default:
+                    throw new AcmeServerException(type, detail);
+            }
         } else {
             try {
                 throw new AcmeException("HTTP " + conn.getResponseCode() + ": "