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# This file is part of GNU TALER.
# Copyright (C) 2014-2017 INRIA
#
# TALER is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free Software
# Foundation; either version 2.1, or (at your option) any later version.
#
# TALER 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License along with
# GNU TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
#
# @author Florian Dold
# @author Marcello Stanisci
"""
Implement URL handlers and payment logic for the blog merchant.
"""
import flask
from urllib.parse import urljoin, urlencode, quote, parse_qsl
import requests
import logging
import os
import base64
import random
import time
import json
import datetime
from pprint import pprint
from talerfrontends.talerconfig import TalerConfig
from talerfrontends.helpers import (make_url,
expect_parameter, join_urlparts, get_query_string,
backend_error)
from talerfrontends.blog.content import (articles,
get_article_file, get_image_file)
logger = logging.getLogger(__name__)
base_dir = os.path.dirname(os.path.abspath(__file__))
app = flask.Flask(__name__, template_folder=base_dir)
app.debug = True
app.secret_key = base64.b64encode(os.urandom(64)).decode('utf-8')
tc = TalerConfig.from_env()
BACKEND_URL = tc["frontends"]["backend"].value_string(required=True)
CURRENCY = tc["taler"]["currency"].value_string(required=True)
INSTANCE = tc["blog"]["instance"].value_string(required=True)
ARTICLE_AMOUNT = dict(value=1, fraction=0, currency=CURRENCY)
app.config.from_object(__name__)
@app.context_processor
def utility_processor():
def url(my_url):
return join_urlparts(flask.request.script_root, my_url)
def env(name, default=None):
return os.environ.get(name, default)
return dict(url=url, env=env)
@app.route("/")
def index():
return flask.render_template("templates/index.html",
merchant_currency=CURRENCY,
articles=articles.values())
@app.route("/javascript")
def javascript_licensing():
return flask.render_template("templates/javascript.html")
# Triggers the refund by serving /refund/test?order_id=XY.
# Will be triggered by a "refund button".
@app.route("/refund", methods=["GET", "POST"])
def refund():
if flask.request.method == "POST":
payed_articles = flask.session["payed_articles"] = flask.session.get("payed_articles", {})
article_name = flask.request.form.get("article_name")
if not article_name:
return flask.jsonify(dict(error="No article_name found in form")), 400
logger.info("Looking for %s to refund" % article_name)
order_id = payed_articles.get(article_name)
if not order_id:
return flask.jsonify(dict(error="Aborting refund: article not payed")), 401
r = requests.post(urljoin(BACKEND_URL, "refund"),
json=dict(order_id=order_id,
refund=dict(value=1, fraction=0, currency=CURRENCY),
reason="Demo reimbursement",
instance=INSTANCE))
if 200 != r.status_code:
return backend_error(r)
payed_articles[article_name] = "__refunded"
response = flask.make_response()
response.headers["X-Taler-Refund-Url"] = make_url("/refund", ("order_id", order_id))
return response, 402
else:
order_id = expect_parameter("order_id", False)
if not order_id:
logger.error("Missing parameter 'order_id'")
return flask.jsonify(dict(error="Missing parameter 'order_id'")), 400
r = requests.get(urljoin(BACKEND_URL, "refund"), params=dict(order_id=order_id,
instance=INSTANCE))
if 200 != r.status_code:
return backend_error(r)
return flask.jsonify(r.json()), r.status_code
@app.route("/generate-contract", methods=["GET"])
def generate_contract():
article_name = expect_parameter("article_name")
pretty_name = article_name.replace("_", " ")
order = dict(
summary=pretty_name,
nonce=flask.request.args.get("nonce"),
amount=ARTICLE_AMOUNT,
max_fee=dict(value=1, fraction=0, currency=CURRENCY),
products=[
dict(
description="Essay: " + pretty_name,
quantity=1,
product_id=0,
price=ARTICLE_AMOUNT,
),
],
fulfillment_url=make_url("/essay/" + quote(article_name)),
pay_url=make_url("/pay"),
merchant=dict(
instance=INSTANCE,
address="nowhere",
name="Kudos Inc.",
jurisdiction="none",
),
extra=dict(article_name=article_name),
)
r = requests.post(urljoin(BACKEND_URL, "proposal"), json=dict(order=order))
if r.status_code != 200:
return backend_error(r)
proposal_resp = r.json()
return flask.jsonify(**proposal_resp)
@app.route("/cc-payment/<name>")
def cc_payment(name):
return flask.render_template("templates/cc-payment.html",
article_name=name)
@app.route("/essay/<name>")
@app.route("/essay/<name>/data/<data>")
def article(name, data=None):
logger.info("processing %s" % name)
payed_articles = flask.session.get("payed_articles", {})
if payed_articles.get(name, "") == "__refunded":
return flask.render_template("templates/article_refunded.html", article_name=name)
if name in payed_articles:
article = articles[name]
if article is None:
flask.abort(500)
if data is not None:
if data in article.extra_files:
return flask.send_file(get_image_file(data))
else:
return "permission denied", 400
return flask.render_template("templates/article_frame.html",
article_file=get_article_file(article),
article_name=name)
contract_url = make_url("/generate-contract", ("article_name",name))
response = flask.make_response(flask.render_template("templates/fallback.html"), 402)
response.headers["X-Taler-Contract-Url"] = contract_url
response.headers["X-Taler-Contract-Query"] = "fulfillment_url"
# Useless (?) header, as X-Taler-Contract-Url takes always (?) precedence
# over X-Offer-Url. This one might only be useful if the contract retrieval
# goes wrong.
response.headers["X-Taler-Offer-Url"] = make_url("/essay/" + quote(name))
return response
@app.route("/pay", methods=["POST"])
def pay():
deposit_permission = flask.request.get_json()
if deposit_permission is None:
e = flask.jsonify(error="no json in body"),
return e, 400
r = requests.post(urljoin(BACKEND_URL, "pay"), json=deposit_permission)
if 200 != r.status_code:
return backend_error(r)
proposal_data = r.json()["contract_terms"]
article_name = proposal_data["extra"]["article_name"]
payed_articles = flask.session["payed_articles"] = flask.session.get("payed_articles", {})
if len(r.json()["refund_permissions"]) != 0:
# we had some refunds on the article purchase already!
logger.info("Article %s was refunded, before /pay" % article_name)
payed_articles[article_name] = "__refunded"
return flask.jsonify(r.json()), 200
if not deposit_permission["order_id"]:
logger.error("order_id missing from deposit_permission!")
return flask.jsonify(dict(error="internal error: ask for refund!")), 500
if article_name not in payed_articles:
logger.info("Article %s goes in state" % article_name)
payed_articles[article_name] = deposit_permission["order_id"]
return flask.jsonify(r.json()), 200
@app.route("/history")
def history():
qs = get_query_string().decode("utf-8")
url = urljoin(BACKEND_URL, "history")
r = requests.get(url, params=dict(parse_qsl(qs)))
if 200 != r.status_code:
return backend_error(r)
return flask.jsonify(r.json()), r.status_code
@app.route("/backoffice")
def track():
response = flask.make_response(flask.render_template("templates/backoffice.html"))
return response
@app.route("/track/transfer")
def track_transfer():
qs = get_query_string().decode("utf-8")
url = urljoin(BACKEND_URL, "track/transfer")
r = requests.get(url, params=dict(parse_qsl(qs)))
if 200 != r.status_code:
return backend_error(r)
return flask.jsonify(r.json()), r.status_code
@app.route("/track/order")
def track_order():
qs = get_query_string().decode("utf-8")
url = urljoin(BACKEND_URL, "track/transaction")
r = requests.get(url, params=dict(parse_qsl(qs)))
if 200 != r.status_code:
return backend_error(r)
return flask.jsonify(r.json()), r.status_code
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