Introduce a custom server evaluation strategy

This custom server evaluation strategy allows to configure the links by providing a set of macro/templates.
It avoids to create one strategy class file for each needs, as template/macros can be used independently.

Change-Id: I3d941e0e786bdbfec037ba59e3f790f890bf9eb0
Signed-off-by: Florent BENOIT <fbenoit@codenvy.com>

assembly/assembly-wsmaster-war/src/main/webapp/WEB-INF/classes/codenvy/che.properties

@@ -211,11 +211,28 @@ che.docker.ip.external=NULL
 #   - 'default':      internal address is address of docker host and ephemeral port are used
 #   - 'docker-local': internal address is address of container within docker network, and exposed ports
 #                     are used.
+#   - 'custom': The evaluation strategy may be customized through a template property.
 # The 'docker-local' strategy may be useful if a firewall prevents communication between che-server and
 # workspace containers, but will prevent communication when che-server and workspace containers are not
 # on the same Docker network.
 che.docker.server_evaluation_strategy=default
 
+
+# Here are macros available for the custom server evaluation strategy
+# serverName: name of the server exposing the port (like tomcat8, ws-agent, etc)
+# machineName: name of the machine of the workspace. (like devMachine)
+# workspaceId: id of the workspace
+# internalIp: IP of the internal address of che (che.docker.ip property)
+# externalIP: IP of the external address of che
+# externalAddresss : external address of che (che.docker.ip.external or if null che.docker.ip)
+# chePort : Che listening port number of workspace master
+# wildcardNipDomain : get external address transformed into a nip.io DNS sub-domain
+# wildcardXipDomain : get external address transformed into a xip.io DNS sub-domain
+che.docker.custom.external.template=<serverName>.<machineName>.<workspaceId>.<wildcardNipDomain>:<chePort>
+
+# Protocol to use for http access (for example it can be set to https)
+che.docker.custom.external.protocol=http
+
 # Provides a Docker network where Che server is running.
 # Workspace containers created by Che will be added to this Docker network.
 # Communications between the Che server and container occur over this network.

plugins/plugin-docker/che-plugin-docker-machine/pom.xml

@@ -53,6 +53,10 @@
             <groupId>javax.ws.rs</groupId>
             <artifactId>javax.ws.rs-api</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.antlr</groupId>
+            <artifactId>ST4</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.eclipse.che.core</groupId>
             <artifactId>che-core-api-core</artifactId>