added a function to transfare money between two user

Website/__init__.py

@@ -283,6 +283,31 @@ def create_app(test_config=None):
             socketio.emit("error", "418", to=session[id])
         leave_room(session[id])
 
+    @app.route("/transfare")
+    def transfare():
+        db = get_db()
+        c = db.cursor()
+        c.execute("SELECT * FROM users")
+        user_list = c.fetchall()
+        return render_template("transfare.html", user_list=user_list)
+
+    @app.route("/api/transfare", methods=['POST'])
+    def api_transfare():
+        db = get_db()
+        c = db.cursor()
+        transfare_from = request.form["transfarefrom"]
+        transfare_to = request.form["transfareto"]
+        change = int(request.form["change"]) * 100
+        c.execute("SELECT * FROM users WHERE id=?", [transfare_from])
+        if c.fetchall()  == []:
+            return render_template("error.html", error_code="043")
+        c.execute("SELECT * FROM users WHERE id=?", [transfare_to])
+        if c.fetchall()  == []:
+            return render_template("error.html", error_code="043")
+        db_handler.change_balance(transfare_from, -change)
+        db_handler.change_balance(transfare_to, change)
+        return render_template("redirect.html")
+
     @app.route("/api/balance", methods=['POST', 'GET']) 
     def api_change():
         if request.method == 'POST':

Website/templates/base.html

@@ -17,6 +17,7 @@
         | <a href="/list">user and tag list</a>
         | <a href="/documentation">Documentation</a>
 	| <a href="/transactionlist">transactionlist</a>
+	| <a href="/transfare">transfare</a>
     </p>
 </nav>
 <hr>

Website/templates/transfare.html

@@ -0,0 +1,33 @@
+{% extends "base.html" %}
+
+{% block title %}
+    transfare
+{% endblock %}
+{% block content %}
+<form action="/api/transfare" method="post">
+	<p>
+		<select name="transfarefrom">
+			<option value="">Select the user to transfare from</option>
+	 		{% for user in user_list %}
+	 			<option value={{user[0]}}>{{user[1]}}</option>
+	 		{% endfor %}
+		</select>
+	</p>
+	<p>
+		<select name="transfareto">
+			<option value="">Select the user to transfare to</option>
+	 		{% for user in user_list %}
+	 			<option value={{user[0]}}>{{user[1]}}</option>
+	 		{% endfor %}
+		</select>
+	</p>
+	<p>
+    		<input name="change" type="number" lang="nb" step="0.01" max=1000 min=-1000 placeholder="money to transfare">
+	</p>
+	<p>
+		<button type="submit">transfare money</button>
+
+	</p>
+</form>
+{% endblock %}
+