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polycules.py
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polycules.py
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import base64
import os
import sqlite3
from contextlib import closing
from flask import (
Flask,
g,
redirect,
render_template,
request,
session,
)
from model import Polycule
# Config
DATABASE = 'dev.db'
DEBUG = True
SECRET_KEY = 'development key'
# App initialization
app = Flask(__name__)
app.config.from_object(__name__)
# Database initialization
def connect_db():
return sqlite3.connect(app.config['DATABASE'])
def migrate():
migrations_dir = os.path.join(
os.path.dirname(os.path.abspath(__file__)),
'migrations')
with closing(connect_db()) as db:
for filename in os.listdir(migrations_dir):
with open(os.path.join(migrations_dir, filename), 'rb') as f:
db.cursor().execute(f.read())
def generate_csrf_token():
if '_csrf_token' not in session:
session['_csrf_token'] = base64.b64encode(os.urandom(12))
return session['_csrf_token']
app.jinja_env.globals['csrf_token'] = generate_csrf_token
@app.before_request
def before_request():
if request.method == 'POST':
token = session.pop('_csrf_token', None)
if not token or token != request.form.get('_csrf_token'):
return render_template('error.jinja2', error='Token expired :(')
g.db = connect_db()
@app.teardown_request
def teardown_request(exception):
db = getattr(g, 'db', None)
if db is not None:
db.close()
# Views
@app.route('/')
def front():
""" Render the front page. """
return render_template('front.jinja2')
@app.route('/<int:polycule_id>', methods=['GET', 'POST'])
def view_polycule(polycule_id):
""" View a polycule. """
try:
polycule = Polycule.get(g.db, polycule_id,
request.form.get('view_pass', b''))
except Polycule.PermissionDenied:
return render_template('view_auth.jinja2')
if polycule is None:
return render_template('error.jinja2', error='Polycule not found :(')
return render_template('view_polycule.jinja2', polycule=polycule)
@app.route('/embed/<int:polycule_id>')
def embed_polycule(polycule_id):
""" View just a polycule for embedding in an iframe. """
polycule = Polycule.get(g.db, polycule_id, request.form.get('view_pass'))
if polycule is None:
return render_template('error.jinja2', error='Polycule not found :(')
return render_template('embed_polycule.jinja2', graph=polycule.graph)
@app.route('/inherit/<int:polycule_id>', methods=['GET', 'POST'])
def inherit_polycule(polycule_id):
"""
Take a given polycule and enter create mode, with that polycule's contents
already in place
"""
try:
polycule = Polycule.get(g.db, polycule_id,
request.form.get('view_pass', b''))
except Polycule.PermissionDenied:
return render_template('view_auth.jinja2')
if polycule is None:
return render_template('error.jinja2', error='Polycule not found :(')
return render_template('create_polycule.jinja2', inherited=polycule.graph)
@app.route('/create')
def create_polycule():
""" Create a new, blank polycule. """
graph = """{
"lastId": 0,
"nodes": [],
"links": []
}"""
return render_template('create_polycule.jinja2', inherited=graph)
@app.route('/save', methods=['POST'])
def save_polycule():
""" Save a created polycule. """
# TODO check json encoding, check size
try:
polycule = Polycule.create(
g.db,
request.form['graph'],
request.form.get('view_pass', b''),
request.form.get('delete_pass', b''))
except Polycule.IdenticalGraph:
return render_template('error.jinja2', error='An identical polycule '
'to the one you submitted already exists!')
return redirect('/{}'.format(polycule.id))
@app.route('/delete/<int:polycule_id>', methods=['POST'])
def delete_polycule(polycule_id):
polycule = Polycule.get(g.db, polycule_id, None, force=True)
if polycule is None:
return render_template('error.jinja2', error='Polycule not found :(')
try:
polycule.delete(request.form.get('delete_pass', b''))
except Polycule.PermissionDenied:
return render_template('view_auth.jinja2', polycule_id=polycule_id)
return redirect('/')
if __name__ == '__main__':
app.run()