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from datetime import datetime
from itsdangerous import Signer
from flask import (Flask, request, url_for, redirect, g,
render_template, session, abort)
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config.from_pyfile('config.cfg')
db = SQLAlchemy(app)
def url_for_other_page(page):
args = request.view_args.copy()
args['page'] = page
return url_for(request.endpoint, **args)
app.jinja_env.globals['url_for_other_page'] = url_for_other_page
@app.before_request
def check_user_status():
g.user = None
if 'user_id' in session:
g.user = User.query.get(session['user_id'])
class Paste(db.Model):
id = db.Column(db.Integer, primary_key=True)
code = db.Column(db.Text)
pub_date = db.Column(db.DateTime)
user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
is_private = db.Column(db.Boolean)
parent_id = db.Column(db.Integer, db.ForeignKey('paste.id'))
parent = db.relationship('Paste', lazy=True, backref='children',
uselist=False, remote_side=[id])
def __init__(self, user, code, parent=None, is_private=False):
self.user = user
self.code = code
self.is_private = is_private
self.pub_date = datetime.utcnow()
self.parent = parent
class User(db.Model):
id = db.Column(db.Integer, primary_key=True)
display_name = db.Column(db.String(120))
fb_id = db.Column(db.String(30), unique=True)
pastes = db.relationship(Paste, lazy='dynamic', backref='user')
@app.route('/', methods=['GET', 'POST'])
def new_paste():
parent = None
reply_to = request.args.get('reply_to', type=int)
if reply_to is not None:
parent = Paste.query.get(reply_to)
if request.method == 'POST' and request.form['code']:
is_private = bool(request.form.get('is_private'))
paste = Paste(g.user, request.form['code'], parent=parent,
is_private=is_private)
db.session.add(paste)
db.session.commit()
sign = Signer(app.secret_key, salt='jackson').sign(str(paste.id)) \
if is_private else None
return redirect(url_for('show_paste', paste_id=paste.id, s=sign))
return render_template('new_paste.html', parent=parent)
@app.route('/<int:paste_id>/')
@app.route('/<int:paste_id>')
def show_paste(paste_id):
paste = Paste.query.options(db.eagerload('children')).get_or_404(paste_id)
if paste.is_private:
try:
sign = request.args.get('s', '')
assert str(paste.id) == \
Signer(app.secret_key, salt='jackson').unsign(sign)
except:
abort(403)
return render_template('show_paste.html', paste=paste)
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