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92 lines
3.3 KiB
92 lines
3.3 KiB
# This is a simple python flask implementation of 'How To Implement A Basic ActivityPub Server'
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# https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
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# © 2018 homebrewserver.club contributors
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import flask, os
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from flask import request
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from flask import Response
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from time import strftime, gmtime
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import httpsig
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#Config
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DOMAIN = 'https://my-example.com'
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USERNAME = 'alice'
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def public_key():
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"""
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Use commandline openssl to generate a public and private key
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"""
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if not os.path.exists('public.pem'):
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os.system('openssl genrsa -out private.pem 2048')
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os.system('openssl rsa -in private.pem -outform PEM -pubout -out public.pem')
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else:
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public_key = open('public.pem').read()
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public_key = public_key.replace('\n','\\n') #public key shouldn't contain verbatim linebreaks in json
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return public_key
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public_key() #generate public_key on first launch
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def sign_header(private_key, key_id, host):
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date= strftime("%a, %d %b %Y %H:%M:%S GMT", gmtime())
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keypair= open(private_key,'rb').read()
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hs = httpsig.HeaderSigner(key_id, secret, algorithm="rsa-sha256", headers=['(request-target): post /inbox', 'host', 'date'])
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auth = hs.sign({"Date": date, "Host": host})
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# thanks to https://github.com/snarfed for the authorization -> signature headers hack
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# this is necessary because httpsig.HeaderSigner returns an Authorization header instead of Signature
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auth['Signature'] = auth.pop('authorization')
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assert auth['Signature'].startswith('Signature ')
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auth['Signature'] = auth['Signature'][len('Signature '):]
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#Flask
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app = flask.Flask(__name__)
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@app.route('/')
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def index():
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return 'It works! Now try to look for a user@my-example.com via the mastodon interface'
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@app.route('/.well-known/webfinger')
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def finger():
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"""
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Respond to webfinger queries (GET /.well-known/webfinger?resource=acct:alice@my-example.com) with a json object pointing to the actor
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see templates/webfinger.json
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"""
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if request.args.get('resource'):
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query = request.args.get('resource')
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actor = query.split(':')[1].split('@')[0] # from 'acct:alice@my-example.com' to 'alice'
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json = flask.render_template('webfinger.json', query=query, actor=actor, domain=DOMAIN) # render our ActivityPub answer
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return Response(response=json, status=200, mimetype="application/json") # return that answer as a json object
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@app.route('/users/<actor>')
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def profile(actor):
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"""
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Return an Actor object
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see templates/actor.json
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"""
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json = flask.render_template('actor.json', preferred_username=USERNAME, actor=actor, domain=DOMAIN, public_key=public_key()) # render our ActivityPub answer
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return Response(response=json, status=200, mimetype="application/json") # return that answer as a json object
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if __name__ == '__main__':
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app.debug =True
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app.run()
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