change to Flask-RESTful, implement basic Question/Category/Categories classes, functionality outlined

server/api.py

@@ -1,4 +1,14 @@
-from flask import current_app, jsonify, request
+"""
+api.py
+
+Organizes all API routes for acquiring, checking, removing questions, as well as other important and miscellaneous
+API interactions, static or dynamic.
+"""
+import copy
+import random
+
+from flask import jsonify
+from flask_restful import Resource, reqparse, abort
 
 from server import questions
 from server.helpers import generate_id
@@ -7,25 +17,78 @@ from server.helpers import generate_id
 # Keys represent random question IDs. Values are Question objects.
 active_questions = {}
 
+# Question categories, key name, value function for acquiring a random question generator.
 categories = {
     'arithmetic': questions.get_arithmetic
 }
 
-
-@current_app.route('/api/<category>/new')
-def new_question(category: str):
-    q_id = None
-    while q_id in active_questions.keys() or q_id is None:
-        q_id = generate_id(5)
-
-    active_questions[q_id] = categories[category]()()
-
-    return jsonify(active_questions[q_id])
+parser = reqparse.RequestParser()
+parser.add_argument(
+    'category',
+    required=False, type=str, choices=tuple(categories.keys()), help='Invalid Category: {error_msg}'
+)
 
 
-@current_app.route('/api/<category>/check')
-def check_question(category: str):
-    if 'id' not in request.args.keys():
-        return jsonify({'error': ''}), 400
+class Question(Resource):
+    """
+    Questions are small objects represented generated questions for users with a prompt and a answer.
+    They are identified by a String ID.
+    """
+
+    def get(self, question_id):
+        """Retrieve information about a given question, including the answer for it."""
+        pass
+
+    def put(self, question_id = None):
+        """
+        Request a new question.
+
+        A category can be specified in the query arguments in order to filter the question type.
+        Furthermore, a question type can be also specified .
+        The Question object is returned, although the answer is omitted.
+        """
+        args = parser.parse_args()
+        q_id = None
+        while q_id in active_questions.keys() or q_id is None:
+            q_id = generate_id(5)
+
+        # Get category arg or choose one if not specified.
+        if args.get('category') is not None:
+            category = args.get('category')
+            if category not in categories.keys():
+                abort(404, message=f'Category {category} is not valid.')
+        else:
+            category = random.choice(list(categories.keys()))
+
+        # Acquire a question generator and generate a function, then store the result.
+        active_questions[q_id] = categories[category]()()
+
+        # Make a shallow copy, hide 'answer' key.
+        question = copy.copy(active_questions[q_id])
+        del question['answer']
+
+        return question, 200
+
+
+class Category(Resource):
+    """
+    A category is a static designation for a problem to be classified as.
+    Any question will only have one category it belongs to.
+    """
+
+    def get(self, category_id):
+        """Get all information about a category"""
+        pass
+
+
+class Categories(Resource):
+    """
+    Categories are static identifiers for the different types of questions available to users.
+    They are identified with pre-chosen identifiers.
+    """
+
+    def get(self):
+        """Get a list of all categories."""
+        return list(categories.keys()), 200
+
 
-    return jsonify({'answer': active_questions.get(request.args[id])})

server/create_app.py

@@ -1,24 +1,33 @@
 from flask import Flask, render_template
+from flask_restful import Api
 
 from server.config import configs
 
-def create_app(env = None):
+
+def create_app(env=None):
     app = Flask(
         __name__,
         static_folder="./../dist/static",
         template_folder="./../dist"
     )
 
+    # Instantiate Flask-Restful API and register appropriate routes
+    from server.api import Question, Category, Categories
+    api = Api(app, prefix='/api/')
+    api.add_resource(Question, '/question/', '/question/<string:question_id>')
+    api.add_resource(Category, '/category/<string:category_id>')
+    api.add_resource(Categories, '/categories/')
+
     if not env:
         env = app.config['ENV']
     app.config.from_object(configs[env])
 
-    @app.shell_context_processor
-    def shell_context():
-        pass
+    # @app.shell_context_processor
+    # def shell_context():
+    #     pass
 
     with app.app_context():
-        #noinspection PyUnresolvedReferences
+        # noinspection PyUnresolvedReferences
         from server import api
 
     @app.route('/', defaults={'path': ''})