Rfactorization. Just a start...

1 files changed, 245 insertions, 0 deletions

diff --git a/web/views/api/common.py b/web/views/api/common.py
new file mode 100644
index 00000000..3476cad9
--- /dev/null
+++ b/web/views/api/common.py
@@ -0,0 +1,245 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -
+
+"""For a given resources, classes in the module intend to create the following
+routes :
+    GET resource/<id>
+        -> to retrieve one
+    POST resource
+        -> to create one
+    PUT resource/<id>
+        -> to update one
+    DELETE resource/<id>
+        -> to delete one
+
+    GET resources
+        -> to retrieve several
+    POST resources
+        -> to create several
+    PUT resources
+        -> to update several
+    DELETE resources
+        -> to delete several
+"""
+import ast
+import json
+import logging
+import dateutil.parser
+from functools import wraps
+from werkzeug.exceptions import Unauthorized, BadRequest
+from flask import request, g, session, Response
+from flask.ext.restful import Resource, reqparse
+
+from web.lib.utils import default_handler
+from web.models import User
+
+logger = logging.getLogger(__name__)
+
+
+def authenticate(func):
+    """
+    Decorator for the authentication to the web services.
+    """
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        logged_in = False
+        if not getattr(func, 'authenticated', True):
+            logged_in = True
+        # authentication based on the session (already logged on the site)
+        elif 'email' in session or g.user.is_authenticated:
+            logged_in = True
+        else:
+            # authentication via HTTP only
+            auth = request.authorization
+            if auth is not None:
+                user = User.query.filter(
+                        User.nickname == auth.username).first()
+                if user and user.check_password(auth.password) \
+                        and user.activation_key == "":
+                    g.user = user
+                    logged_in = True
+        if logged_in:
+            return func(*args, **kwargs)
+        raise Unauthorized({'WWWAuthenticate': 'Basic realm="Login Required"'})
+    return wrapper
+
+
+def to_response(func):
+    """Will cast results of func as a result, and try to extract
+    a status_code for the Response object"""
+    def wrapper(*args, **kwargs):
+        status_code = 200
+        result = func(*args, **kwargs)
+        if isinstance(result, Response):
+            return result
+        elif isinstance(result, tuple):
+            result, status_code = result
+        return Response(json.dumps(result, default=default_handler),
+                        status=status_code)
+    return wrapper
+
+
+class PyAggAbstractResource(Resource):
+    method_decorators = [authenticate, to_response]
+    attrs = {}
+    to_date = []  # list of fields to cast to datetime
+
+    def __init__(self, *args, **kwargs):
+        super(PyAggAbstractResource, self).__init__(*args, **kwargs)
+
+    @property
+    def controller(self):
+        return self.controller_cls(getattr(g.user, 'id', None))
+
+    @property
+    def wider_controller(self):
+        if g.user.is_admin():
+            return self.controller_cls()
+        return self.controller_cls(getattr(g.user, 'id', None))
+
+    def reqparse_args(self, req=None, strict=False, default=True, args=None):
+        """
+        strict: bool
+            if True will throw 400 error if args are defined and not in request
+        default: bool
+            if True, won't return defaults
+        args: dict
+            the args to parse, if None, self.attrs will be used
+        """
+        parser = reqparse.RequestParser()
+        for attr_name, attrs in (args or self.attrs).items():
+            if attrs.pop('force_default', False):
+                parser.add_argument(attr_name, location='json', **attrs)
+            elif not default and (not request.json
+                    or request.json and attr_name not in request.json):
+                continue
+            else:
+                parser.add_argument(attr_name, location='json', **attrs)
+        parsed = parser.parse_args(strict=strict) if req is None \
+                else parser.parse_args(req, strict=strict)
+        for field in self.to_date:
+            if parsed.get(field):
+                try:
+                    parsed[field] = dateutil.parser.parse(parsed[field])
+                except Exception:
+                    logger.exception('failed to parse %r', parsed[field])
+        return parsed
+
+
+class PyAggResourceNew(PyAggAbstractResource):
+
+    def post(self):
+        """Create a single new object"""
+        return self.controller.create(**self.reqparse_args()), 201
+
+
+class PyAggResourceExisting(PyAggAbstractResource):
+
+    def get(self, obj_id=None):
+        """Retreive a single object"""
+        return self.controller.get(id=obj_id)
+
+    def put(self, obj_id=None):
+        """update an object, new attrs should be passed in the payload"""
+        args = self.reqparse_args(default=False)
+        new_values = {key: args[key] for key in
+                      set(args).intersection(self.attrs)}
+        if 'user_id' in new_values and g.user.is_admin():
+            controller = self.wider_controller
+        else:
+            controller = self.controller
+        return controller.update({'id': obj_id}, new_values), 200
+
+    def delete(self, obj_id=None):
+        """delete a object"""
+        self.controller.delete(obj_id)
+        return None, 204
+
+
+class PyAggResourceMulti(PyAggAbstractResource):
+
+    def get(self):
+        """retrieve several objects. filters can be set in the payload on the
+        different fields of the object, and a limit can be set in there as well
+        """
+        try:
+            limit = request.json.pop('limit', 10)
+            order_by = request.json.pop('order_by', None)
+            query = self.controller.read(**request.json)
+        except:
+            args = {}
+            for k, v in request.args.items():
+                if k in self.attrs.keys():
+                    if self.attrs[k]['type'] in [bool, int]:
+                        args[k] = ast.literal_eval(v)
+                    else:
+                        args[k] = v
+            limit = request.args.get('limit', 10)
+            order_by = request.args.get('order_by', None)
+            query = self.controller.read(**args)
+        if order_by:
+            query = query.order_by(order_by)
+        if limit:
+            query = query.limit(limit)
+        return [res for res in query]
+
+    def post(self):
+        """creating several objects. payload should be a list of dict.
+        """
+        if 'application/json' not in request.headers.get('Content-Type'):
+            raise BadRequest("Content-Type must be application/json")
+        status = 201
+        results = []
+        for attrs in request.json:
+            try:
+                results.append(self.controller.create(**attrs).id)
+            except Exception as error:
+                status = 206
+                results.append(str(error))
+        # if no operation succeded, it's not partial anymore, returning err 500
+        if status == 206 and results.count('ok') == 0:
+            status = 500
+        return results, status
+
+    def put(self):
+        """creating several objects. payload should be:
+        >>> payload
+        [[obj_id1, {attr1: val1, attr2: val2}]
+         [obj_id2, {attr1: val1, attr2: val2}]]
+        """
+        if 'application/json' not in request.headers.get('Content-Type'):
+            raise BadRequest("Content-Type must be application/json")
+        status = 200
+        results = []
+        for obj_id, attrs in request.json:
+            try:
+                new_values = {key: attrs[key] for key in
+                              set(attrs).intersection(self.attrs)}
+                self.controller.update({'id': obj_id}, new_values)
+                results.append('ok')
+            except Exception as error:
+                status = 206
+                results.append(str(error))
+        # if no operation succeded, it's not partial anymore, returning err 500
+        if status == 206 and results.count('ok') == 0:
+            status = 500
+        return results, status
+
+    def delete(self):
+        """will delete several objects,
+        a list of their ids should be in the payload"""
+        if 'application/json' not in request.headers.get('Content-Type'):
+            raise BadRequest("Content-Type must be application/json")
+        status = 204
+        results = []
+        for obj_id in request.json:
+            try:
+                self.controller.delete(obj_id)
+                results.append('ok')
+            except Exception as error:
+                status = 206
+                results.append(error)
+        # if no operation succeded, it's not partial anymore, returning err 500
+        if status == 206 and results.count('ok') == 0:
+            status = 500
+        return results, status