From 6165fd50886164eb402e1b89d0a653ed219a4ace Mon Sep 17 00:00:00 2001
From: mprahl <mprahl@redhat.com>
Date: Sep 19 2017 20:48:28 +0000
Subject: Add an API that exposes information about the MBS server


---

diff --git a/README.rst b/README.rst
index f7cf55b..b51eb2a 100644
--- a/README.rst
+++ b/README.rst
@@ -493,6 +493,26 @@ parameters::
       }
     }
 
+
+Listing about
+-------------
+
+This API shows information about the MBS server::
+
+    GET /module-build-service/1/about/
+
+::
+
+    HTTP 200 OK
+
+::
+
+    {
+      "auth_method": "oidc",
+      "version": "1.3.26"
+    }
+
+
 HTTP Response Codes
 -------------------
 
diff --git a/module_build_service/__init__.py b/module_build_service/__init__.py
index 24fbbd7..66921b2 100644
--- a/module_build_service/__init__.py
+++ b/module_build_service/__init__.py
@@ -40,6 +40,7 @@ for a number of tasks:
   infrastructure services can pick up the work.
 """
 
+import pkg_resources
 from flask import Flask, has_app_context, url_for
 from flask_sqlalchemy import SQLAlchemy
 from logging import getLogger
@@ -53,6 +54,10 @@ from module_build_service.errors import (
 from module_build_service.config import init_config
 from module_build_service.proxy import ReverseProxy
 
+try:
+    version = pkg_resources.get_distribution('module-build-service').version
+except pkg_resources.DistributionNotFound:
+    version = 'unknown'
 
 app = Flask(__name__)
 app.wsgi_app = ReverseProxy(app.wsgi_app)
diff --git a/module_build_service/views.py b/module_build_service/views.py
index f557820..123d274 100644
--- a/module_build_service/views.py
+++ b/module_build_service/views.py
@@ -31,14 +31,13 @@ import module_build_service.auth
 from flask import request, jsonify
 from flask.views import MethodView
 
-from module_build_service import app, conf, log
-from module_build_service import models, db
+from module_build_service import app, conf, log, models, db, version
 from module_build_service.utils import (
     pagination_metadata, filter_module_builds, filter_component_builds,
     submit_module_build_from_scm, submit_module_build_from_yaml,
     get_scm_url_re)
 from module_build_service.errors import (
-    ValidationError, Forbidden, NotFound)
+    ValidationError, Forbidden, NotFound, ProgrammingError)
 
 api_v1 = {
     'module_builds': {
@@ -73,6 +72,12 @@ api_v1 = {
             'methods': ['GET'],
         }
     },
+    'about': {
+        'url': '/module-build-service/1/about/',
+        'options': {
+            'methods': ['GET']
+        }
+    }
 }
 
 
@@ -203,6 +208,20 @@ class ModuleBuildAPI(MethodView):
         return jsonify(module.json()), 200
 
 
+class AboutAPI(MethodView):
+    def get(self):
+        json = {'version': version}
+        config_items = ['auth_method']
+        for item in config_items:
+            config_item = getattr(conf, item)
+            # All config items have a default, so if doesn't exist it is a programming error
+            if not config_item:
+                raise ProgrammingError(
+                    'An invalid config item of "{0}" was specified'.format(item))
+            json[item] = config_item
+        return jsonify(json), 200
+
+
 class BaseHandler(object):
     def __init__(self, request):
         self.username, self.groups = module_build_service.auth.get_user(request)
@@ -291,6 +310,7 @@ def register_api_v1():
     """ Registers version 1 of MBS API. """
     module_view = ModuleBuildAPI.as_view('module_builds')
     component_view = ComponentBuildAPI.as_view('component_builds')
+    about_view = AboutAPI.as_view('about')
     for key, val in api_v1.items():
         if key.startswith('component_build'):
             app.add_url_rule(val['url'],
@@ -302,7 +322,13 @@ def register_api_v1():
                              endpoint=key,
                              view_func=module_view,
                              **val['options'])
+        elif key.startswith('about'):
+            app.add_url_rule(val['url'],
+                             endpoint=key,
+                             view_func=about_view,
+                             **val['options'])
         else:
             raise NotImplementedError("Unhandled api key.")
 
+
 register_api_v1()
diff --git a/tests/test_views/test_views.py b/tests/test_views/test_views.py
index 3e74ac6..cfb4207 100644
--- a/tests/test_views/test_views.py
+++ b/tests/test_views/test_views.py
@@ -37,7 +37,8 @@ import hashlib
 from tests import app, init_data
 from module_build_service.errors import UnprocessableEntity
 from module_build_service.models import ComponentBuild, ModuleBuild
-from module_build_service import conf, db
+from module_build_service import conf, db, version
+import module_build_service.config as mbs_config
 import module_build_service.scheduler.handlers.modules
 
 
@@ -928,3 +929,11 @@ class TestViews(unittest.TestCase):
         allow_custom_scmurls.return_value = True
         res2 = submit('git://some.custom.url.org/modules/testmodule.git?#68931c9')
         self.assertEquals(res2.status_code, 201)
+
+    def test_about(self):
+        with patch.object(mbs_config.Config, 'auth_method', new_callable=PropertyMock) as auth:
+            auth.return_value = 'kerberos'
+            rv = self.client.get('/module-build-service/1/about/')
+        data = json.loads(rv.data)
+        self.assertEqual(rv.status_code, 200)
+        self.assertEquals(data, {'auth_method': 'kerberos', 'version': version})