text: # all imports
  import sqlite3
  import os
  from flask import Flask , request , session , g , redirect , url_for , \
  		abort , render_template , flash
  from contextlib import closing
  
  # Database configuration
  
  DATABASE = os.environ['OPENSHIFT_DATA_DIR'] + 'flaskr.db'
  DEBUG = True
  SECRET_KEY = 'development key'
  USERNAME = 'admin'
  PASSWORD = 'admin'
  
  # create our little application :)
  
  app = Flask(__name__)
  app.config.from_object(__name__)
  app.config.from_envvar('FLASKR_SETTINGS', silent=True)
  
  def connect_db():
  	return sqlite3.connect(app.config['DATABASE'])
  
  def init_db():
  	with closing(connect_db()) as db:
  		with app.open_resource('schema.sql' , mode='r') as f:
  			db.cursor().executescript(f.read())
  		db.commit()
  
  @app.before_request
  def before_request():
  	g.db = connect_db()
  
  @app.teardown_request
  def teardown_request(exception):
  	db = getattr(g, 'db',None)
  	if db is not None:
  		db.close()
  
  @app.route('/')
  def show_entries():
  	cur = g.db.execute('select title , text from entries order by id desc')
  	entries = [dict(title=row[0] , text=row[1]) for row in cur.fetchall()]
  	return render_template('show_entries.html' , entries = entries)
  
  @app.route('/add',methods=['POST'])
  def add_entry():
  	if not session.get('logged_in'):
  		abort(401)
  	g.db.execute('insert into entries (title , text) values (? , ?)',
  			[request.form['title'], request.form['text']])
  	g.db.commit()
  	flash('New entry was successfully posted')
  	return redirect(url_for('show_entries'))
  
  @app.route('/login' , methods=['GET' , 'POST'])
  def login():
  	error = None
  	if request.method == 'POST':
  		if request.form['username'] != app.config['USERNAME']:
  			error = 'Invalid username'
  		elif request.form['password'] != app.config['PASSWORD']:
  			error = 'Invalid password'
  		else :
  			session['logged_in'] = True
  			flash('You are logged in')
  			return redirect(url_for('show_entries'))
  	return render_template('login.html' , error = error)
  
  @app.route('/logout')
  def logout():
  	session.pop('logged_in' , None)
  	flash('You were logged out')
  	return redirect(url_for('show_entries'))
  
  
  
  if __name__ == '__main__':
  	# init_db()
  	app.run()
  