Accept String IP for convenience

acme4j-client/src/main/java/org/shredzone/acme4j/Identifier.java

@@ -112,6 +112,22 @@ public class Identifier implements Serializable {
         return new Identifier(TYPE_IP, ip.getHostAddress());
     }
 
+    /**
+     * Creates a new IP identifier for the given {@link InetAddress}.
+     *
+     * @param ip
+     *            IP address as {@link String}
+     * @return New {@link Identifier}
+     * @since 2.7
+     */
+    public static Identifier ip(String ip) {
+        try {
+            return ip(InetAddress.getByName(ip));
+        } catch (UnknownHostException ex) {
+            throw new IllegalArgumentException("Bad IP: " + ip, ex);
+        }
+    }
+
     /**
      * Returns the identifier type.
      */

acme4j-client/src/test/java/org/shredzone/acme4j/IdentifierTest.java

@@ -88,6 +88,11 @@ public class IdentifierTest {
         assertThat(id2.getType(), is(Identifier.TYPE_IP));
         assertThat(id2.getValue(), is("2001:db8:85a3:0:0:8a2e:370:7334"));
         assertThat(id2.getIP().getHostAddress(), is("2001:db8:85a3:0:0:8a2e:370:7334"));
+
+        Identifier id3 = Identifier.ip("192.168.2.99");
+        assertThat(id3.getType(), is(Identifier.TYPE_IP));
+        assertThat(id3.getValue(), is("192.168.2.99"));
+        assertThat(id3.getIP().getHostAddress(), is("192.168.2.99"));
     }
 
     @Test(expected = AcmeProtocolException.class)

src/site/markdown/usage/order.md

@@ -178,17 +178,19 @@ _acme4j_ supports the [ACME IP](https://tools.ietf.org/html/draft-ietf-acme-ip)
 ```java
 Order order = account.newOrder()
         .identifier(Identifier.ip(InetAddress.getByName("192.168.1.2")))
+        .identifier(Identifier.ip("192.168.2.3"))   // for your convenience
         .identifier(Identifier.dns("example.org"))
         .create();
 ```
 
 The example also shows how to add domain names as DNS `Identifier` objects. Adding domain names via `domain()` is just a shortcut notation for it.
 
-The `CSRBuilder` also accepts IP addresses for generating the CSR:
+The `CSRBuilder` also accepts IP addresses and `Identifier` for generating the CSR:
 
 ```java
 CSRBuilder csrb = new CSRBuilder();
 csrb.addIP(InetAddress.getByName("192.168.1.2"));
+csrb.addIdentifier(Identifier.ip("192.168.2.3"));
 csrb.sign(domainKeyPair);
 byte[] csr = csrb.getEncoded();
 ```