Add basic API view for "about" page

i.e. this returns app version and some package versions

tailbone/api/__init__.py

@@ -31,6 +31,7 @@ from .master import APIMasterView, SortColumn
 
 
 def includeme(config):
+    config.include('tailbone.api.common')
     config.include('tailbone.api.auth')
     config.include('tailbone.api.customers')
     config.include('tailbone.api.upgrades')

tailbone/api/common.py

@@ -26,9 +26,12 @@ Tailbone Web API - "Common" Views
 
 from __future__ import unicode_literals, absolute_import
 
+import rattail
 from rattail.db import model
 from rattail.mail import send_email
+from rattail.util import OrderedDict
 
+import tailbone
 from tailbone import forms
 from tailbone.forms.common import Feedback
 from tailbone.api import APIView, api
@@ -36,6 +39,37 @@ from tailbone.db import Session
 
 
 class CommonView(APIView):
+    """
+    Misc. "common" views for the API.
+    """
+
+    @api
+    def about(self):
+        """
+        Generic view to show "about project" info page.
+        """
+        return {
+            'project_title': self.get_project_title(),
+            'project_version': self.get_project_version(),
+            'packages': self.get_packages(),
+        }
+
+    def get_project_title(self):
+        return self.rattail_config.app_title(default="Tailbone")
+
+    def get_project_version(self):
+        import tailbone
+        return tailbone.__version__
+
+    def get_packages(self):
+        """
+        Should return the full set of packages which should be displayed on the
+        'about' page.
+        """
+        return OrderedDict([
+            ('rattail', rattail.__version__),
+            ('Tailbone', tailbone.__version__),
+        ])
 
     @api
     def feedback(self):
@@ -65,10 +99,13 @@ class CommonView(APIView):
 
         return {'error': "Form did not validate!"}
 
-
     @classmethod
     def defaults(cls, config):
 
+        # about
+        config.add_route('api.about', '/about', request_method='GET')
+        config.add_view(cls, attr='about', route_name='api.about', renderer='json')
+
         # feedback
         config.add_route('api.feedback', '/feedback', request_method=('OPTIONS', 'POST'))
         config.add_view(cls, attr='feedback', route_name='api.feedback', renderer='json')