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main.py
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main.py
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#!/usr/bin/env python
import webapp2, jinja2, os, hashlib, logging, urllib
import json as json
import datetime
from google.appengine.api import urlfetch
from model import Document, DocumentProof, LatestBlockchainDocuments
from coinbase import CoinbaseAccount
from secrets import CALLBACK_SECRET, COINBASE_API_KEY, \
SECRET_ADMIN_PATH
from blockchain import get_txs_for_addr, publish_data, do_check_document,\
publish_data_old
BTC_TO_SATOSHI = 100000000
BLOCKCHAIN_FEE = int(0.0001 * BTC_TO_SATOSHI)
DONATION_ADDRESS = "17Ab2P14CJ7FMJF6ARVQ7oVrA3iA5RFP6G"
POE_PAYMENTS_ADDRESS = "11xP3sjdQy4QgP47RNHLH6DnKXWWVfb6B"
SATOSHI = 1
MIN_SATOSHIS_PAYMENT = int(0.005 * BTC_TO_SATOSHI)
JINJA_ENVIRONMENT = jinja2.Environment(
loader=jinja2.FileSystemLoader(os.path.dirname(__file__)),
extensions=['jinja2.ext.autoescape'])
def hash_digest(x):
hasher = hashlib.new('SHA256')
hasher.update(x)
return hasher.hexdigest()
def export_timestamp(timestamp):
if not timestamp:
return None
return timestamp.strftime("%Y-%m-%d %H:%M:%S")
class StaticHandler(webapp2.RequestHandler):
def render_template(self, name):
if name == "":
name = "index"
values = {
"name": name
}
self.response.write(JINJA_ENVIRONMENT.get_template("templates/" + name + '.html').render(values))
def get(self, _):
name = self.request.path.split("/")[1]
try:
self.render_template(name)
except IOError, e:
self.render_template("error")
class JsonAPIHandler(webapp2.RequestHandler):
def post(self):
self.get()
def get(self):
resp = self.handle()
self.response.headers['Content-Type'] = "application/json"
dthandler = lambda obj: export_timestamp(obj) if isinstance(obj, datetime.datetime) else None
self.response.write(json.dumps(resp, default=dthandler))
class DigestStoreHandler(JsonAPIHandler):
def store_digest(self, digest):
docproof = Document.get_doc(digest)
if docproof:
return {"success" : False, "reason": "existing", "digest": digest, "args": [export_timestamp(docproof.timestamp)]}
d = Document.new(digest)
return {"success": True, "digest": d.digest}
class DocumentUploadHandler(DigestStoreHandler):
def handle(self):
d = self.request.get("d") # full document
if not d:
return {"success" : False, "reason" : "format"}
digest = hash_digest(d)
return self.store_digest(digest)
class DocumentRegisterHandler(DigestStoreHandler):
def handle(self):
digest = self.request.get("d") # expects client-side hashing
if not digest or len(digest) != 64:
return {"success" : False, "reason" : "format"}
return self.store_digest(digest)
class BootstrapHandler(JsonAPIHandler):
def handle(self):
n = 0
for old in DocumentProof.all():
doc = Document.get_doc(old.digest)
if not doc:
doc = Document.new(old.digest)
doc.pending = old.tx == None
doc.tx = old.tx
doc.timestamp = old.timestamp
doc.blockstamp = old.blockstamp
n += 1
if n == 10:
break
return {"success" : True, "processed": n}
class LatestDocumentsHandler(JsonAPIHandler):
def handle(self):
confirmed = self.request.get("confirmed")
confirmed = confirmed and confirmed == "true"
return [doc.to_dict() for doc in Document.get_latest(confirmed)]
class DocumentGetHandler(JsonAPIHandler):
def handle(self):
digest = self.request.get("d")
doc = Document.get_doc(digest)
if not doc:
return {"success" : False}
return {"success": True, "doc": doc.to_dict()}
class BasePaymentCallback(JsonAPIHandler):
def process_payment(self, satoshis, digest):
secret = self.request.get("secret")
if len(digest) != 64 or secret != CALLBACK_SECRET or satoshis < MIN_SATOSHIS_PAYMENT:
return {"success" : False, "reason" : "format or payment below " + str(MIN_SATOSHIS_PAYMENT)}
doc = Document.get_doc(digest)
if not doc:
return {"success" : False, "reason" : "Couldn't find document"}
doc.pending = False
doc.put()
return {"success" : True}
class PaymentCallback(BasePaymentCallback):
def handle(self):
j = json.loads(self.request.body)
order = j["order"]
digest = order["custom"]
satoshis = order["total_btc"]["cents"]
return self.process_payment(satoshis, digest)
class ApiPaymentCallback(BasePaymentCallback):
def handle(self):
j = json.loads(self.request.body)
satoshis = int(j["amount"] * BTC_TO_SATOSHI)
digest = self.request.get("d")
return self.process_payment(satoshis, digest)
class DocumentCheckHandler(JsonAPIHandler):
def handle(self):
digest = self.request.get("d")
doc = Document.get_doc(digest)
if not doc or doc.tx:
return {"success" : False, "error": "format"}
ladd, radd = doc.get_address_repr()
ltxs = get_txs_for_addr(ladd)
rtxs = get_txs_for_addr(radd)
if not ltxs or not rtxs:
return {"success" : False, "error": "no transactions"}
intersection = [tx for tx in ltxs if tx in rtxs]
if len(intersection) == 0:
return {"success" : False, "error": "no intersecting"}
tx_hash, tx_timestamp = intersection[0]
doc.confirmed(tx_hash, tx_timestamp)
LatestBlockchainDocuments.get_inst().add_document(doc)
return {"success" : True, "tx" : doc.tx}
class PendingHandler(webapp2.RequestHandler):
def get(self):
pending = Document.get_pending()
url = SECRET_ADMIN_PATH + '/autopay'
for d in pending:
self.response.write('<a href="%s?d=%s">%s</a><br /><br />' % (url, d.digest, d.digest))
class AutopayHandler(JsonAPIHandler):
def handle(self):
digest = self.request.get("d")
doc = Document.get_doc(digest)
if not doc or not doc.tx:
return {"success" : False, "error": "format"}
# TODO: add check to prevent double timestamping
tx, message = publish_data_old(doc)
do_check_document(digest)
return {"success" : True, "tx" : tx, "message" : message}
class ExternalRegisterHandler(DigestStoreHandler):
def get_pay_address(self, d):
account = CoinbaseAccount(api_key=COINBASE_API_KEY)
callback_url = "http://www.proofofexistence.com/api/api_callback?secret=%s&d=%s" % (CALLBACK_SECRET, d)
return account.generate_receive_address(callback_url).get("address")
def handle(self):
digest = self.request.get("d") # expects client-side hashing
if not digest or len(digest) != 64:
return {"success" : False, "reason" : "format"}
try:
digest.decode("hex")
except TypeError:
return {"success" : False, "reason" : "format"}
ret = self.store_digest(digest)
if not ret["success"]:
del ret["args"]
return ret
pay_address = self.get_pay_address(digest)
if not pay_address:
return {"success" : False, "reason" : "cant generate pay address"}
ret["pay_address"] = pay_address
ret["price"] = MIN_SATOSHIS_PAYMENT
return ret
class ExternalStatusHandler(JsonAPIHandler):
def handle(self):
digest = self.request.get("d")
doc = Document.get_doc(digest)
if not digest:
return {"success": False, "reason": "format"}
if not doc:
return {"success": False, "reason": "nonexistent"}
if doc.tx:
return {"success": True, "status": "confirmed"}
if doc.ladd and doc.radd:
return {"success": True, "status": "pending"}
return {"success": True, "status": "registered"}
app = webapp2.WSGIApplication([
# static files
('/((?!api).)*', StaticHandler),
# internal API
('/api/document/register', DocumentRegisterHandler),
('/api/document/upload', DocumentUploadHandler),
('/api/document/latest', LatestDocumentsHandler),
('/api/document/get', DocumentGetHandler),
('/api/document/check', DocumentCheckHandler),
# manual admin
(SECRET_ADMIN_PATH + '/pending', PendingHandler),
(SECRET_ADMIN_PATH + '/autopay', AutopayHandler),
('/api/bootstrap', BootstrapHandler),
# callbacks
('/api/callback', PaymentCallback),
('/api/api_callback', ApiPaymentCallback),
# public API
('/api/v1/register', ExternalRegisterHandler),
('/api/v1/status', ExternalStatusHandler)
], debug=False)