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# coding=utf-8
import os
import random
import string
from _weakref import ref
from flask import Blueprint, jsonify, render_template
from flask.views import MethodView
from rethinkdb.ast import Table
from pysite.constants import ErrorCodes
from pysite.database import RethinkDB
class BaseView(MethodView):
"""
Base view class with functions and attributes that should be common to all view classes.
This class should be subclassed, and is not intended to be used directly.
"""
name = None # type: str
def render(self, *template_names, **context):
context["current_page"] = self.name
context["view"] = self
return render_template(template_names, **context)
class RouteView(BaseView):
"""
Standard route-based page view. For a standard page, this is what you want.
This class is intended to be subclassed - use it as a base class for your own views, and set the class-level
attributes as appropriate. For example:
>>> class MyView(RouteView):
... name = "my_view" # Flask internal name for this route
... path = "/my_view" # Actual URL path to reach this route
...
... def get(self): # Name your function after the relevant HTTP method
... return self.render("index.html")
For more complicated routing, see http://exploreflask.com/en/latest/views.html#built-in-converters
"""
path = None # type: str
@classmethod
def setup(cls: "RouteView", manager: "pysite.route_manager.RouteManager", blueprint: Blueprint):
"""
Set up the view by adding it to the blueprint passed in - this will also deal with multiple inheritance by
calling `super().setup()` as appropriate.
This is for a standard route view. Nothing special here.
:param manager: Instance of the current RouteManager
:param blueprint: Current Flask blueprint to register this route to
"""
if hasattr(super(), "setup"):
super().setup(manager, blueprint)
if not cls.path or not cls.name:
raise RuntimeError("Route views must have both `path` and `name` defined")
blueprint.add_url_rule(cls.path, view_func=cls.as_view(cls.name))
class APIView(RouteView):
"""
API route view, with extra methods to help you add routes to the JSON API with ease.
This class is intended to be subclassed - use it as a base class for your own views, and set the class-level
attributes as appropriate. For example:
>>> class MyView(APIView):
... name = "my_view" # Flask internal name for this route
... path = "/my_view" # Actual URL path to reach this route
...
... def get(self): # Name your function after the relevant HTTP method
... return self.error(ErrorCodes.unknown_route)
"""
def validate_key(self, api_key: str):
""" Placeholder! """
return api_key == os.environ.get("API_KEY")
def generate_api_key(self):
""" Generate a random string of n characters. """
pool = random.choices(string.ascii_letters + string.digits, k=32)
return "".join(pool)
def error(self, error_code: ErrorCodes):
data = {
"error_code": error_code.value,
"error_message": "Unknown error"
}
http_code = 200
if error_code is ErrorCodes.unknown_route:
data["error_message"] = "Unknown API route"
http_code = 404
elif error_code is ErrorCodes.unauthorized:
data["error_message"] = "Unauthorized"
http_code = 401
elif error_code is ErrorCodes.invalid_api_key:
data["error_message"] = "Invalid API-key"
http_code = 401
elif error_code is ErrorCodes.bad_data_format:
data["error_message"] = "Input data in incorrect format"
http_code = 400
elif error_code is ErrorCodes.incorrect_parameters:
data["error_message"] = "Incorrect parameters provided"
http_code = 400
response = jsonify(data)
response.status_code = http_code
return response
class DBViewMixin:
"""
Mixin for views that make use of RethinkDB. It can automatically create a table with the specified primary
key using the attributes set at class-level.
This class is intended to be mixed in alongside one of the other view classes. For example:
>>> class MyView(APIView, DBViewMixin):
... name = "my_view" # Flask internal name for this route
... path = "/my_view" # Actual URL path to reach this route
... table_name = "my_table" # Name of the table to create
... table_primary_key = "username" # Primary key to set for this table
You may omit `table_primary_key` and it will be defaulted to RethinkDB's default column - "id".
"""
table_name = "" # type: str
table_primary_key = "id" # type: str
@classmethod
def setup(cls: "DBViewMixin", manager: "pysite.route_manager.RouteManager", blueprint: Blueprint):
"""
Set up the view by creating the table specified by the class attributes - this will also deal with multiple
inheritance by calling `super().setup()` as appropriate.
:param manager: Instance of the current RouteManager (used to get a handle for the database object)
:param blueprint: Current Flask blueprint
"""
if hasattr(super(), "setup"):
super().setup(manager, blueprint)
if not cls.table_name:
raise RuntimeError("Routes using DBViewMixin must define `table_name`")
cls._db = ref(manager.db)
manager.db.create_table(cls.table_name, primary_key=cls.table_primary_key)
@property
def table(self) -> Table:
return self.db.query(self.table_name)
@property
def db(self) -> RethinkDB:
return self._db()
class ErrorView(BaseView):
"""
Error view, shown for a specific HTTP status code, as defined in the class attributes.
This class is intended to be subclassed - use it as a base class for your own views, and set the class-level
attributes as appropriate. For example:
>>> class MyView(ErrorView):
... name = "my_view" # Flask internal name for this route
... path = "/my_view" # Actual URL path to reach this route
... error_code = 404
...
... def get(self): # Name your function after the relevant HTTP method
... return "Replace me with a template, 404 not found", 404
"""
error_code = None # type: int
@classmethod
def setup(cls: "ErrorView", manager: "pysite.route_manager.RouteManager", blueprint: Blueprint):
"""
Set up the view by registering it as the error handler for the HTTP status code specified in the class
attributes - this will also deal with multiple inheritance by calling `super().setup()` as appropriate.
:param manager: Instance of the current RouteManager
:param blueprint: Current Flask blueprint to register the error handler for
"""
if hasattr(super(), "setup"):
super().setup(manager, blueprint)
if not cls.name or not cls.error_code:
raise RuntimeError("Error views must have both `name` and `error_code` defined")
blueprint.errorhandler(cls.error_code)(cls.as_view(cls.name))
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