Added flask code example

test.py

@@ -0,0 +1,107 @@
+import json
+from flask import Flask, Response, redirect, url_for, request, session, abort, render_template
+from flask_login import LoginManager, UserMixin, login_required, login_user, logout_user
+app = Flask(__name__)
+
+# config
+app.config.update(
+    DEBUG = True,
+    SECRET_KEY = 'secret_xxx'
+)
+
+class User(UserMixin):
+
+    def __init__(self, id):
+        self.id = id
+        with open('users.json') as jsonfile:
+            data = json.load(jsonfile)
+            self.name = data[str(id)]['name']
+            self.password = data[str(id)]['password']
+        
+    def __repr__(self):
+        return "%d/%s/%s" % (self.id, self.name, self.password)
+
+leaderboard = []
+
+davide = {}
+davide['name'] = 'Davide'
+davide['score'] = 20
+leaderboard.append(davide)
+
+pawel = {}
+pawel['name'] = 'Pawel'
+pawel['score'] = 10
+leaderboard.append(pawel)
+
+mark = {}
+mark['name'] = 'Mark'
+mark['score'] = 1
+leaderboard.append(mark)
+
+sven = {}
+sven['name'] = 'Sven'
+sven['score'] = -5
+leaderboard.append(sven)
+
+wille = {}
+wille['name'] = 'Wille'
+wille['score'] = -15
+leaderboard.append(wille)
+
+cook = davide
+eaters = ["Pawel", "Mark", "Sven"]
+
+# flask-login
+login_manager = LoginManager()
+login_manager.init_app(app)
+login_manager.login_view = "login"
+
+@app.route("/")
+@login_required
+def index():
+    return render_template('index.html', leaderboard=leaderboard, cook=cook, eaters=eaters)
+
+# somewhere to login
+@app.route("/login", methods=["GET", "POST"])
+def login():
+    if request.method == 'POST':
+        username = request.form['username']
+        password = request.form['password'] 
+        jsonfile = open('users.json')
+        data = json.load(jsonfile)
+        for i in range(1, 1 + int(data['nofusers'])):
+            if data[str(i)]['name'] == username and data[str(i)]['password'] == password:
+                id = i
+                jsonfile.close()
+                user = User(id)
+                login_user(user)
+                return redirect(request.args.get("next"))
+        jsonfile.close()
+        return abort(401)
+    else:
+        return Response('''
+        <form action="" method="post">
+            <p><input type=text name=username>
+            <p><input type=password name=password>
+            <p><input type=submit value=Login>
+        </form>
+        ''')
+
+# somewhere to logout
+@app.route("/logout")
+@login_required
+def logout():
+    logout_user()
+    return Response('<p>Logged out</p>')
+
+
+# handle login failed
+@app.errorhandler(401)
+def page_not_found(e):
+    return Response('<p>Login failed</p>')
+    
+    
+# callback to reload the user object        
+@login_manager.user_loader
+def load_user(userid):
+    return User(userid)

users.json

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+{"nofusers":"6", "1":{"name":"Davide", "password":"davide"}, "2":{"name":"Marek", "password":"marek"}, "3":{"name":"Sven", "password":"sven"}, "4":{"name":"Wille", "password":"wille"}, "5":{"name":"David", "password":"david"}, "6":{"name":"Ahmed", "password":"ahmed"}}