Support scriptText api to execute groovy scripts on the server

Jenkins features a nice script console[1] which allows users
to remotely run arbitrary groovy scripts on the Jenkins master.

Examples:

$ curl -d 'script=println("hello world")' -X POST
  http://localhost:8080/scriptText
hello world

$ curl -d 'script=println(Jenkins.instance.pluginManager.plugins)' -X POST
  http://localhost:8080/scriptText
[Plugin:windows-slaves, Plugin:ssh-slaves, Plugin:translation, Plugin:cvs,
Plugin:nodelabelparameter, Plugin:external-monitor-job, Plugin:subversion,
Plugin:ssh-credentials, Plugin:token-macro, Plugin:ant, Plugin:ldap,
Plugin:credentials, Plugin:matrix-auth, Plugin:matrix-project, Plugin:mailer,
Plugin:jquery, Plugin:maven-plugin, Plugin:pam-auth]

[1] https://wiki.jenkins-ci.org/display/JENKINS/Jenkins+Script+Console

Change-Id: Ia4fbfca970165d890d7e076f47ddcde7633afa9b

jenkins/__init__.py

@@ -94,6 +94,7 @@ VIEW_NAME = 'view/%(name)s/api/json?tree=name'
 CREATE_VIEW = 'createView?name=%(name)s'
 CONFIG_VIEW = 'view/%(name)s/config.xml'
 DELETE_VIEW = 'view/%(name)s/doDelete'
+SCRIPT_TEXT = 'scriptText'
 
 # for testing only
 EMPTY_CONFIG_XML = '''<?xml version='1.0' encoding='UTF-8'?>
@@ -679,6 +680,24 @@ class Jenkins(object):
         return self.jenkins_open(Request(
             self.build_job_url(name, parameters, token), b''))
 
+    def run_script(self, script):
+        '''Execute a groovy script on the jenkins master.
+
+        :param script: The groovy script, ``string``
+        :returns: The result of the script run.
+
+        Example::
+            >>> j = Jenkins()
+            >>> info = j.run_script("println(Jenkins.instance.pluginManager.plugins)")
+            >>> print(info)
+            u'[Plugin:windows-slaves, Plugin:ssh-slaves, Plugin:translation,
+            Plugin:cvs, Plugin:nodelabelparameter, Plugin:external-monitor-job,
+            Plugin:mailer, Plugin:jquery, Plugin:antisamy-markup-formatter,
+            Plugin:maven-plugin, Plugin:pam-auth]'
+        '''
+        return self.jenkins_open(Request(self.server + SCRIPT_TEXT,
+                                         "script=".encode('utf-8') + script.encode('utf-8')))
+
     def stop_build(self, name, number):
         '''Stop a running Jenkins build.
 

tests/test_jenkins.py

@@ -450,6 +450,17 @@ class JenkinsTest(unittest.TestCase):
         self.assertEqual(build_info, {'foo': 'bar'})
         self._check_requests(jenkins_mock.call_args_list)
 
+    @patch.object(jenkins.Jenkins, 'jenkins_open')
+    def test_run_script(self, jenkins_mock):
+        j = jenkins.Jenkins('http://example.com/', 'test', 'test')
+
+        j.run_script(u'println(\"Hello World!\")')
+
+        self.assertEqual(
+            jenkins_mock.call_args[0][0].get_full_url(),
+            u'http://example.com/scriptText')
+        self._check_requests(jenkins_mock.call_args_list)
+
     @patch.object(jenkins.Jenkins, 'jenkins_open')
     def test_stop_build(self, jenkins_mock):
         j = jenkins.Jenkins('http://example.com/', 'test', 'test')