Help:Toolforge/My first Flask OAuth tool: Difference between revisions

The following content has been placed in a collapsed box for improved usability.

$ mkdir -p $HOME/www/python/src

$ webservice --backend=kubernetes python3.7 shell
If you don't see a command prompt, try pressing enter.
$ python3 -m venv $HOME/www/python/venv
$ source $HOME/www/python/venv/bin/activate
$ pip install --upgrade pip
Downloading/unpacking pip from [...]
[...]
Successfully installed pip
Cleaning up...

$ cat > $HOME/www/python/src/requirements.txt << EOF
flask
EOF
$ pip install -r $HOME/www/python/src/requirements.txt
Collecting flask (from -r www/python/src/requirements.txt (line 1))
[...]
Successfully installed [...]

$ exit

# -*- coding: utf-8 -*-
#
# This file is part of the Toolforge flask WSGI tutorial
#
# Copyright (C) 2017 Bryan Davis and contributors
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along
# with this program.  If not, see <http://www.gnu.org/licenses/>.

import flask

app = flask.Flask(__name__)

@app.route('/')
def index():
  return 'Hello World!'

$ webservice --backend=kubernetes python3.7 start
Starting webservice.

$HOME
 ├─ uwsgi.log
 └─ www
     └─ python
         ├─ src
         │   └─ app.py
         └─ venv

$ tail -n 50 $HOME/uwsgi.log
$ tail -n 50 $HOME/error.log

$ webservice --backend=kubernetes python3.7 shell
If you don't see a command prompt, try pressing enter.
$ source $HOME/www/python/venv/bin/activate
$ cat >> $HOME/www/python/src/requirements.txt << EOF
pyyaml
EOF
$ pip install -r $HOME/www/python/src/requirements.txt
Requirement already satisfied: flask [...]
Collecting pyyaml (from -r req.txt (line 2))
[...]
Successfully installed pyyaml
$ exit

# -*- coding: utf-8 -*-
#
# This file is part of the Toolforge Flask + OAuth WSGI tutorial
#
# Copyright (C) 2017 Bryan Davis and contributors
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along
# with this program.  If not, see <http://www.gnu.org/licenses/>.

import flask
import os
import yaml

app = flask.Flask(__name__)

# Load configuration from YAML file
__dir__ = os.path.dirname(__file__)
app.config.update(
    yaml.safe_load(open(os.path.join(__dir__, 'config.yaml'))))

@app.route('/')
def index():
    return app.config['GREETING']

$ touch $HOME/www/python/src/config.yaml
$ chmod u=rw,go= $HOME/www/python/src/config.yaml
$ cat > $HOME/www/python/src/config.yaml << EOF
GREETING: Goodnight moon!
EOF

$ webservice restart
Restarting webservice...

$ webservice --backend=kubernetes python3.7 shell
If you don't see a command prompt, try pressing enter.
$ source $HOME/www/python/venv/bin/activate
$ cat >> $HOME/www/python/src/requirements.txt << EOF
mwoauth
EOF
$ pip install -r $HOME/www/python/src/requirements.txt
Requirement already satisfied: flask [...]
Requirement already satisfied: pyyaml [...]
Collecting mwoauth (from -r req.txt (line 3))
[...]
Successfully installed [...]
$ exit

# -*- coding: utf-8 -*-
#
# This file is part of the Toolforge Flask + OAuth WSGI tutorial
#
# Copyright (C) 2017 Bryan Davis and contributors
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along
# with this program.  If not, see <http://www.gnu.org/licenses/>.

import flask
import mwoauth
import os
import yaml

app = flask.Flask(__name__)

# Load configuration from YAML file
__dir__ = os.path.dirname(__file__)
app.config.update(
    yaml.safe_load(open(os.path.join(__dir__, 'config.yaml'))))

@app.route('/')
def index():
    greeting = app.config['GREETING']
    username = flask.session.get('username', None)
    return flask.render_template(
        'index.html', username=username, greeting=greeting)

@app.route('/login')
def login():
    """Initiate an OAuth login.

    Call the MediaWiki server to get request secrets and then redirect the
    user to the MediaWiki server to sign the request.
    """
    consumer_token = mwoauth.ConsumerToken(
        app.config['CONSUMER_KEY'], app.config['CONSUMER_SECRET'])
    try:
        redirect, request_token = mwoauth.initiate(
            app.config['OAUTH_MWURI'], consumer_token)
    except Exception:
        app.logger.exception('mwoauth.initiate failed')
        return flask.redirect(flask.url_for('index'))
    else:
        flask.session['request_token'] = dict(zip(
            request_token._fields, request_token))
        return flask.redirect(redirect)

@app.route('/oauth-callback')
def oauth_callback():
    """OAuth handshake callback."""
    if 'request_token' not in flask.session:
        flask.flash(u'OAuth callback failed. Are cookies disabled?')
        return flask.redirect(flask.url_for('index'))

    consumer_token = mwoauth.ConsumerToken(
        app.config['CONSUMER_KEY'], app.config['CONSUMER_SECRET'])

    try:
        access_token = mwoauth.complete(
            app.config['OAUTH_MWURI'],
            consumer_token,
            mwoauth.RequestToken(**flask.session['request_token']),
            flask.request.query_string)

        identity = mwoauth.identify(
            app.config['OAUTH_MWURI'], consumer_token, access_token)    
    except Exception:
        app.logger.exception('OAuth authentication failed')

    else:
        flask.session['access_token'] = dict(zip(
            access_token._fields, access_token))
        flask.session['username'] = identity['username']

    return flask.redirect(flask.url_for('index'))

@app.route('/logout')
def logout():
    """Log the user out by clearing their session."""
    flask.session.clear()
    return flask.redirect(flask.url_for('index'))

$ mkdir $HOME/www/python/src/templates
$ edit $HOME/www/python/src/templates/index.html

<!DOCTYPE HTML>
<html>
    <head>
        <title>My first Flask OAuth tool</title>
    </head>
    <body>
        {% if username %}
        <p>Hello {{ username }}!</p>
        <p><a href="{{ url_for('logout') }}">logout</a></p>
        {% else %}
        <p>{{ greeting }}</p>
        <p><a href="{{ url_for('login') }}">login</a></p>
        {% endif %}
    </body>
</html>

$ cat >> $HOME/www/python/src/config.yaml << EOF
SECRET_KEY: $(python -c "import os; print repr(os.urandom(24))")
OAUTH_MWURI: https://meta.wikimedia.org/w/index.php
CONSUMER_KEY: the 'consumer token' value from your OAuth consumer registration
CONSUMER_SECRET: the 'secret token' value from your OAuth consumer registration
EOF

$ webservice restart
Restarting webservice...

Help:Toolforge/My first Flask OAuth tool: Difference between revisions

Revision as of 10:38, 10 December 2021

Contents

Overview

Getting started

Prerequisites

Skills

Accounts

Step-by-step guide

Step 1: Create a new tool account

Step 2: Create a basic Flask WSGI webservice

How to create a basic Flask WSGI webservice

Notes

Troubleshooting

Step 3: Add a configuration file

How to add a configuration file

Troubleshooting

Step 4: Add support for OAuth authentication

How to add mwoauth to the virtual environment

Additional troubleshooting

bash: webservice: command not found

Error: An error occurred in the OAuth protocol: Invalid signature

Get more debugging output from Flask

toolsws.tool.InvalidToolException: Tool username should begin with tools.

Next Steps

Communication and support

See also

Navigation menu

Help:Toolforge/My first Flask OAuth tool: Difference between revisions

Revision as of 10:38, 10 December 2021

Overview

Getting started

Prerequisites

Skills

Accounts

Step-by-step guide

Step 1: Create a new tool account

Step 2: Create a basic Flask WSGI webservice

How to create a basic Flask WSGI webservice

Notes

Troubleshooting

Step 3: Add a configuration file

How to add a configuration file

Troubleshooting

Step 4: Add support for OAuth authentication

How to add mwoauth to the virtual environment

Additional troubleshooting

bash: webservice: command not found

Error: An error occurred in the OAuth protocol: Invalid signature

Get more debugging output from Flask

toolsws.tool.InvalidToolException: Tool username should begin with tools.

Next Steps

Communication and support

See also

Navigation menu

Search