Added OpenID example

examples/openidexample/openidexample.py

@@ -0,0 +1,165 @@
+# -*- coding: utf-8 -*-
+"""
+    OpenID Example
+    ~~~~~~~~~~~~~~
+
+    This simple application shows how OpenID can be used in an application.
+
+    Dependencies:
+
+    -   python-openid
+    -   SQLAlchemy
+
+    :copyright: (c) 2010 by Armin Ronacher.
+    :license: BSD, see LICENSE for more details.
+"""
+from flask import Flask, render_template, request, g, session, flash, \
+     redirect, url_for, abort
+from simpleopenid import SimpleOpenID
+
+from sqlalchemy import create_engine, Column, Integer, String
+from sqlalchemy.orm import scoped_session, sessionmaker
+from sqlalchemy.ext.declarative import declarative_base
+
+# configuration
+DATABASE_URI = 'sqlite:////tmp/openidexample.db'
+OPENID_FS_PATH = '/tmp/openidexample-store'
+SECRET_KEY = 'development key'
+DEBUG = True
+
+# setup flask
+app = Flask(__name__)
+app.debug = DEBUG
+app.secret_key = SECRET_KEY
+
+# setup simpleopenid
+oid = SimpleOpenID(OPENID_FS_PATH)
+
+# setup sqlalchemy
+engine = create_engine(DATABASE_URI)
+db_session = scoped_session(sessionmaker(autocommit=False,
+                                         autoflush=False,
+                                         bind=engine))
+Base = declarative_base()
+Base.query = db_session.query_property()
+
+def init_db():
+    Base.metadata.create_all(bind=engine)
+
+
+class User(Base):
+    __tablename__ = 'users'
+    id = Column(Integer, primary_key=True)
+    name = Column(String(60))
+    email = Column(String(200))
+    openid = Column(String(200))
+
+    def __init__(self, name, email, openid):
+        self.name = name
+        self.email = email
+        self.openid = openid
+
+
+@app.before_request
+def before_request():
+    g.user = None
+    if 'openid' in session:
+        g.user = User.query.filter_by(openid=session['openid']).first()
+
+
+@app.route('/')
+def index():
+    return render_template('index.html')
+
+
+@app.route('/login', methods=['GET', 'POST'])
+@oid.loginhandler
+def login():
+    """Does the login via OpenID.  Has to call into `oid.try_login`
+    to start the OpenID machinery.
+    """
+    # if we are already logged in, go back to were we came from
+    if g.user is not None:
+        return redirect(oid.get_next_url())
+    if request.method == 'POST':
+        openid = request.form.get('openid')
+        if openid:
+            return oid.try_login(openid)
+    return render_template('login.html', next_url=oid.get_next_url())
+
+
+@oid.after_login
+def create_or_login(identity_url):
+    """This is called when login with OpenID succeeded and it's not
+    necessary to figure out if this is the users's first login or not.
+    This function has to redirect otherwise the user will be presented
+    with a terrible URL which we certainly don't want.
+    """
+    session['openid'] = identity_url
+    user = User.query.filter_by(openid=identity_url).first()
+    if user is not None:
+        flash(u'Successfully signed in')
+        g.user = user
+        return redirect(oid.get_next_url())
+    return redirect(url_for('create_profile', next=oid.get_next_url()))
+
+
+@app.route('/create-profile', methods=['GET', 'POST'])
+def create_profile():
+    """If this is the user's first login, the create_or_login function
+    will redirect here so that the user can set up his profile.
+    """
+    if g.user is not None or 'openid' not in session:
+        return redirect(url_for('index'))
+    if request.method == 'POST':
+        name = request.form['name']
+        email = request.form['email']
+        if not name:
+            flash(u'Error: you have to provide a name')
+        elif '@' not in email:
+            flash(u'Error: you have to enter a valid email address')
+        else:
+            flash(u'Profile successfully created')
+            db_session.add(User(name, email, session['openid']))
+            db_session.commit()
+            return redirect(oid.get_next_url())
+    return render_template('create_profile.html', next_url=oid.get_next_url())
+
+
+@app.route('/profile', methods=['GET', 'POST'])
+def edit_profile():
+    """Updates a profile"""
+    if g.user is None:
+        abort(401)
+    form = dict(name=g.user.name, email=g.user.email)
+    if request.method == 'POST':
+        if 'delete' in request.form:
+            db_session.delete(g.user)
+            db_session.commit()
+            session['openid'] = None
+            flash(u'Profile deleted')
+            return redirect(url_for('index'))
+        form['name'] = request.form['name']
+        form['email'] = request.form['email']
+        if not form['name']:
+            flash(u'Error: you have to provide a name')
+        elif '@' not in form['email']:
+            flash(u'Error: you have to enter a valid email address')
+        else:
+            flash(u'Profile successfully created')
+            g.user.name = form['name']
+            g.user.email = form['email']
+            db_session.commit()
+            return redirect(url_for('edit_profile'))
+    return render_template('edit_profile.html', form=form)
+
+
+@app.route('/logout')
+def logout():
+    session.pop('openid', None)
+    flash(u'You were signed out')
+    return redirect(oid.get_next_url())
+
+
+if __name__ == '__main__':
+    app.run()

examples/openidexample/simpleopenid.py

@@ -0,0 +1,108 @@
+# -*- coding: utf-8 -*-
+"""
+    simpleopenid
+    ~~~~~~~~~~~~
+
+    Tiny wrapper around python-openid to make working with the basic
+    API in a flask application easier.  Adapt this code for your own
+    project if necessary.
+
+    :copyright: (c) 2010 by Armin Ronacher.
+    :license: BSD, see LICENSE for more details.
+"""
+from functools import wraps
+
+from flask import request, session, flash, redirect
+from werkzeug import url_quote
+
+from openid.association import Association
+from openid.store.interface import OpenIDStore
+from openid.store.filestore import FileOpenIDStore
+from openid.consumer.consumer import Consumer, SUCCESS, CANCEL
+from openid.consumer import discover
+from openid.store import nonce
+
+# python-openid is a really stupid library in that regard, we have
+# to disable logging by monkey patching
+from openid import oidutil
+oidutil.log = lambda *a, **kw: None
+
+
+class SimpleOpenID(object):
+    """Simple helper class for OpenID auth."""
+
+    def __init__(self, store_path):
+        self.store_path = store_path
+        self.after_login_func = None
+
+    def create_store(self):
+        """Creates the filesystem store"""
+        return FileOpenIDStore(self.store_path)
+
+    def signal_error(self, msg):
+        """Signals an error.  It does this by flashing a message"""
+        flash(u'Error: ' + msg)
+
+    def get_next_url(self):
+        """Return the URL where we want to redirect to."""
+        return request.values.get('next') or \
+               request.referrer or \
+               request.url_root
+
+    def get_current_url(self):
+        """the current URL + next"""
+        return request.base_url + '?next=' + url_quote(self.get_next_url())
+
+    def get_success_url(self):
+        """Return the success URL"""
+        return self.get_current_url() + '&openid_complete=yes'
+
+    def errorhandler(f):
+        """Called if an error occours with the message.  By default
+        ``'Error: message'`` is flashed.
+        """
+        self.signal_error = f
+        return f
+
+    def after_login(self, f):
+        """This function will be called after login.  It must redirect to
+        a different place and remember the user somewhere.  The session
+        is not modified by SimpleOpenID.
+        """
+        self.after_login_func = f
+        return f
+
+    def loginhandler(self, f):
+        """Marks a function as login handler.  This decorator injects some
+        more OpenID required logic.
+        """
+        self.login_endpoint = f.__name__
+        @wraps(f)
+        def decorated(*args, **kwargs):
+            if request.args.get('openid_complete') != u'yes':
+                return f(*args, **kwargs)
+            consumer = Consumer(session, self.create_store())
+            openid_response = consumer.complete(request.args.to_dict(),
+                                                self.get_current_url())
+            if openid_response.status == SUCCESS:
+                return self.after_login_func(openid_response.identity_url)
+            elif openid_response.status == CANCEL:
+                self.signal_error(u'The request was cancelled')
+                return redirect(self.get_current_url())
+            self.signal_error(u'OpenID authentication error')
+            return redirect(self.get_current_url())
+        return decorated
+
+    def try_login(self, identity_url):
+        """This tries to login with the given identity URL.  This function
+        must be called from the login_handler.
+        """
+        try:
+            consumer = Consumer(session, self.create_store())
+            auth_request = consumer.begin(identity_url)
+        except discover.DiscoveryFailure:
+            self.signal_error(u'The OpenID was invalid')
+            return redirect(self.get_current_url())
+        trust_root = request.host_url
+        return redirect(auth_request.redirectURL(request.host_url,
+                                                 self.get_success_url()))

examples/openidexample/static/style.css

@@ -0,0 +1,39 @@
+body {
+    font-family: 'Georgia', serif;
+    font-size: 16px;
+    margin: 30px;
+    padding: 0;
+}
+
+a {
+    color: #335E79;
+}
+
+p.message {
+    color: #335E79;
+    padding: 10px;
+    background: #CADEEB;
+}
+
+input {
+    font-family: 'Georgia', serif;
+    font-size: 16px;
+    border: 1px solid black;
+    color: #335E79;
+    padding: 2px;
+}
+
+input[type="submit"] {
+    background: #CADEEB;
+    color: #335E79;
+    border-color: #335E79;
+}
+
+input[name="openid"] {
+    background: url(openid.png) 4px no-repeat;
+    padding-left: 24px;
+}
+
+h1, h2 {
+    font-weight: normal;
+}

examples/openidexample/templates/create_profile.html

@@ -0,0 +1,22 @@
+{% extends "layout.html" %}
+{% block title %}Create Profile{% endblock %}
+{% block body %}
+  <h2>Create Profile</h2>
+  <p>
+    Hey!  This is the first time you signed in on this website.  In
+    order to proceed we need a couple of more information from you:
+  <form action="" method=post>
+    <dl>
+      <dt>Name:
+      <dd><input type=text name=name size=30 value="{{ request.form.name }}">
+      <dt>E-Mail
+      <dd><input type=text name=email size=30 value="{{ request.form.email }}">
+    </dl>
+    <p>
+      <input type=submit value="Create profile">
+      <input type=hidden name=next value="{{ next_url }}">
+  </form>
+  <p>
+    If you don't want to proceed, you can <a href="{{ url_for('logout')
+    }}">sign out</a> again.
+{% endblock %}

examples/openidexample/templates/edit_profile.html

@@ -0,0 +1,16 @@
+{% extends "layout.html" %}
+{% block title %}Edit Profile{% endblock %}
+{% block body %}
+  <h2>Edit Profile</h2>
+  <form action="" method=post>
+    <dl>
+      <dt>Name:
+      <dd><input type=text name=name size=30 value="{{ form.name }}">
+      <dt>E-Mail
+      <dd><input type=text name=email size=30 value="{{ form.email }}">
+    </dl>
+    <p>
+      <input type=submit value="Update profile">
+      <input type=submit name=delete value="Delete">
+  </form>
+{% endblock %}

examples/openidexample/templates/index.html

@@ -0,0 +1,10 @@
+{% extends "layout.html" %}
+{% block body %}
+  <h2>Overview</h2>
+  {% if g.user %}
+  <p>
+    Hello {{ g.user.name }}!
+  {% endif %}
+  <p>
+    This is just an example page so that something is here.
+{% endblock %}

examples/openidexample/templates/layout.html

@@ -0,0 +1,18 @@
+<!doctype html>
+<title>{% block title %}Welcome{% endblock %} | Flask OpenID Example</title>
+<link rel=stylesheet type=text/css href="{{ url_for('static',
+  filename='style.css') }}">
+<h1>Flask OpenID Example</h1>
+<ul class=navigation>
+  <li><a href="{{ url_for('index') }}">overview</a>
+  {% if g.user %}
+  <li><a href="{{ url_for('edit_profile') }}">profile</a>
+  <li><a href="{{ url_for('logout') }}">sign out [{{ g.user.name }}]</a>
+  {% else %}
+  <li><a href="{{ url_for('login') }}">sign in</a>
+  {% endif %}
+</ul>
+{% for message in get_flashed_messages() %}
+  <p class=message>{{ message }}
+{% endfor %}
+{% block body %}{% endblock %}

examples/openidexample/templates/login.html

@@ -0,0 +1,12 @@
+{% extends "layout.html" %}
+{% block title %}Sign in{% endblock %}
+{% block body %}
+  <h2>Sign in</h2>
+  <form action="" method=post>
+    <p>
+      OpenID:
+      <input type=text name=openid size=30>
+      <input type=submit value="Sign in">
+      <input type=hidden name=next value="{{ next_url }}">
+  </form>
+{% endblock %}