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btcpos.py
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btcpos.py
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import requests
import lcd
import qrencode
from Tkinter import *
import tkFont
from time import sleep
import threading
import datetime
class POS:
def __init__(self,username,password,storage_address,logfile = None):
self.createGUI()
self.lcd = lcd.HD44780()
self.username=username
self.passwd=password
self.out_address=storage_address
self.logfile = logfile
def initTransaction(self):
self.input=''
self.amt=''
self.backcounter=0
self.enter=False
self.qr_panel,self.address_panel,self.bitamount_panel,self.amount_panel,self.address_panel,self.end_panel=None,None,None,None,None,None
#returns new address or ""
def getNewAddress(self,label=None):
payload = {'password': self.passwd, 'label': label}
gen_address_url = 'https://blockchain.info/merchant/' + self.username + '/new_address'
address = ""
try:
r = requests.get(gen_address_url, params=payload, verify=True)
print r.text
address = eval(r.text,{},{})['address']
except:
pass
return address
#returns wallet balance or -1
def getWalletBalance(self):
payload = {'password': self.passwd}
get_balance_url = 'https://blockchain.info/merchant/' + self.username + '/balance'
balance = -1
try:
r = requests.get(get_balance_url, params=payload, verify=True)
print r.text
balance = eval(r.text,{},{})['balance']
except:
pass
return balance
#returns address balance or -1
def getAddressBalance(self,address,confirmations='0'):
get_balance_url = 'https://blockchain.info/q/addressbalance/' + address
balance = -1
try:
r = requests.get(get_balance_url, verify=True)
print r.text
balance = eval(r.text,{},{})
except:
pass
return balance
#returns True or False if payment goes through or not
def sendPaymentToAddress(self,from_address,to_address,bitamount,fee=0.0005):
bitamount=str(int((float(bitamount)-fee) * 100000000)) #take out miner fee and convert to satoshi
payload = {'password': self.passwd,'to' : to_address, 'from' :from_address,'amount':bitamount}
get_balance_url = 'https://blockchain.info/merchant/' + self.username + '/payment'
payment_message = False
try:
r = requests.get(get_balance_url, params=payload, verify=True)
print r.text
payment_message = eval(r.text,{},{})['message']
except:
pass
return payment_message
#archives address so as to not bog down blockchain
#returns address archived or False
def archiveAddress(self,address):
payload = {'password': self.passwd,'address': address}
get_balance_url = 'https://blockchain.info/merchant/' + self.username + '/archive_address'
archived = False
try:
r = requests.get(get_balance_url, params=payload, verify=True)
print r.text
archived = eval(r.text,{},{})['archived']
except:
pass
return archived
#returns current bitcoin value or -1
def toBTC(self,v,c='USD'):
payload = {'currency': c, 'value': v}
to_btc_url = 'https://blockchain.info/tobtc'
btotal=-1
try:
r = requests.get(to_btc_url, params=payload,verify=True)
if r.status_code == 200:
btotal=float(r.text)
except:
pass
return btotal
#returns last USD/BTC rate or -1
def getBTCRate(self):
ticker_url = 'https://blockchain.info/ticker'
rate = -1
try:
r = requests.get(ticker_url)
rate = eval(r.text,{},{})['USD']['last']
except:
pass
return rate
#returns payment total, evaluating if necessary
def getPaymentTotal(self):
while True:
self.getPayment(self.amt)
if self.amt:
try:
if eval(self.amt,{},{}) <= 0:
raise Exception('')
if self.amt==str(eval(self.amt,{},{})):
break
self.amt=str(eval(self.amt,{},{}))
except:
self.amt='0'
return self.amt
#gets a single payment line and puts it in self.amt
def getPayment(self,last_input=''):
self.input = last_input
if last_input == '' or last_input == '0':
self.amt='x'
old_amt=self.amt
self.lcd.setBottomLine('$'+last_input)
self.lcd.printLCD()
while not self.input == self.amt and old_amt == self.amt:
if not self.input == last_input:
last_input=self.input
self.lcd.setBottomLine('$'+last_input)
self.lcd.printBottomLine()
else:
sleep(0.05)
def waitForPaymentOrCancel(self,address,bitamount,confirmations=0):
confirmed=False
while not self.backcounter >= 3 and not confirmed:
if self.getAddressBalance(address,confirmations) >= bitamount:
confirmed = True
sleep(2)
return confirmed
#waits for enter to be pressed
def waitForEnter(self):
while not self.enter:
pass
sleep(0.05)
#returns payment-URI-encoded QR Code image(100x100px)
def getQRCode(self,address, amount, label=None, message=None):
amount = 'amount=' + str(amount) #+ 'X8'
label = '' if not label else '&label='+label
message = '' if not message else '&message='+message
qr_str = 'bitcoin:'+address+'?'+amount + label + message
print qr_str
im = qrencode.encode(qr_str,3)
return im[2].resize((300,300))
#picks up character input from gui -- in conjunction to the bind_all call
def key(self,event):
key = self.getKeycodeValue(event.keycode)
print 'keycode: '+str(event.keycode)
if not key == '':
if len(key) == 1:
if not key == '\b':
if not key == '\n':
self.input+=key
self.backcounter=0
self.enter=False
if key == '\b':
self.backcounter+=1
self.input=self.input[:-1]
if key == '\n':
self.backcounter=0
if not self.amt == self.input:
self.amt=self.input
self.input=''
self.enter=True
#returns predefined character or '' if incompatable
def getKeycodeValue(self,keycode):
if keycode == 79:
return '7'
elif keycode == 80:
return '8'
elif keycode == 81:
return '9'
elif keycode == 82:
return '-'
elif keycode == 83:
return '4'
elif keycode == 84:
return '5'
elif keycode == 85:
return '6'
elif keycode == 86:
return '+'
elif keycode == 87:
return '1'
elif keycode == 88:
return '2'
elif keycode == 89:
return '3'
elif keycode == 90:
return '0'
elif keycode == 91:
return '.'
elif keycode == 106:
return '/'
elif keycode == 63:
return '*'
elif keycode == 104:
return '\n'
elif keycode == 22:
return '\b'
else:
return ''
#creates gui
def createGUI(self):
self.gui = Tk()
w = self.gui.winfo_screenwidth()
h = self.gui.winfo_screenheight()
geom = str(w)+'x'+str(h)+'+0+0'
self.gui.geometry(geom)
self.gui.bind_all('<Key>',self.key)
self.gui.configure(background='black')
#sets gui to bitcoin accepted here image
def setWaitingGUI(self):
self.gui.configure(background='black')
photo = PhotoImage(file='bitcoin_accepted.gif')
self.wait_panel = Label(self.gui,image = photo,borderwidth=0)
self.wait_panel.image = photo
self.wait_panel.pack()
#sets gui to payment screen
def setPaymentGUI(self,img,address,bitamount,amount=None):
self.gui.configure(background='white')
img.save('qr.gif')
photo = PhotoImage(file='qr.gif')
self.qr_panel = Label(self.gui,image = photo)
self.qr_panel.image = photo
f=tkFont.Font(family="Helvetica",size=16)
self.address_panel = Label(self.gui, text = address,font=f)
self.address_panel.configure(background='white')
f=tkFont.Font(family="Helvetica",size=20,weight=tkFont.BOLD)
self.bitamount_panel = Label(self.gui, text= u'\u0E3F'+str(bitamount), font=f)
self.bitamount_panel.configure(background='white')
if amount != None:
self.amount_panel = Label(self.gui, text = '$'+str(amount), font=f)
self.amount_panel.configure(background='white')
self.qr_panel.grid(column=0,row=0,columnspan=3,rowspan=3,padx=30,pady=30)
self.address_panel.grid(column=0,row=3,padx=10)
self.bitamount_panel.grid(column=3,row=2,padx=3)
if amount != None:
self.amount_panel.grid(column=3,row=1,padx=3)
#clears gui
def clearGUI(self):
if self.qr_panel:
self.qr_panel.grid_forget()
if self.address_panel:
self.address_panel.grid_forget()
if self.bitamount_panel:
self.bitamount_panel.grid_forget()
if self.amount_panel:
self.amount_panel.grid_forget()
if self.address_panel:
self.address_panel.grid_forget()
if self.end_panel:
self.end_panel.pack_forget()
if self.wait_panel:
self.wait_panel.pack_forget()
#sets gui to confirmation screen
def setConfirmationGUI(self,bitamount=None):
str='Payment Confirmed'
if bitamount:
str+='\nAmount: '+bitamount
f=tkFont.Font(family="Helvetica",size=28,weight=tkFont.BOLD)
self.end_panel=Label(self.gui,text=str,font=f)
self.end_panel.configure(background='white')
self.end_panel.pack(pady=160)
#sets gui to canceled screen
def setCanceledGUI(self,bitamount=None):
str='Payment Canceled'
f=tkFont.Font(family="Helvetica",size=28,weight=tkFont.BOLD)
self.end_panel=Label(self.gui,text=str,font=f)
self.end_panel.configure(background='white')
self.end_panel.pack(pady=160)
#executes the steps of a single transaction
def newTransaction(self):
try:
self.setWaitingGUI()
self.initTransaction()
self.lcd.setTopLine('Payment Amount')
self.lcd.printLCD()
amount=self.getPaymentTotal()
self.lcd.setTopLine('Payment Entered')
self.lcd.printLCD()
retries=3
for x in range(retries):
address=self.getNewAddress()
if address:
break
for x in range(retries):
bitamount=self.toBTC(amount)
if not bitamount == -1:
break
if not address or not bitamount:
raise Exception('trouble accessing Blockchain')
#catch both too big (blockchain returns -1) and too small amounts
if bitamount < 0.0001:
self.logEntry('BAD',amount,address,bitamount)
self.lcd.setTopLine('Bad Amount')
self.lcd.printLCD()
self.enter=False
self.waitForEnter()
self.clearGUI()
return
image=self.getQRCode(address,bitamount)
self.clearGUI()
self.setPaymentGUI(image,address,bitamount,amount)
self.lcd.setTopLine('QR Code Ready')
self.lcd.printLCD()
confirmed=self.waitForPaymentOrCancel(address,bitamount)
self.clearGUI()
if confirmed:
self.lcd.setTopLine('Payment Approved')
self.lcd.printLCD()
self.setConfirmationGUI()
if self.out_address:
self.sendPaymentToAddress(address,self.out_address,bitamount)
self.logEntry('OK',amount,address,bitamount)
else:
self.logEntry('CANC',amount,address,bitamount)
self.lcd.setTopLine('Payment Canceled')
self.lcd.printLCD()
self.setCanceledGUI()
self.archiveAddress(address)
self.enter=False
self.waitForEnter()
self.clearGUI()
except Exception, err:
print err, sys.exc_info()[0]
self.lcd.setTopLine('Network Error')
self.enter=False
self.waitForEnter()
self.clearGUI()
def logEntry(self,code,amount,address,bitamount):
if self.logfile:
try:
log = open(self.logfile,'a')
log.write(",".join((datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"),code,amount,address,str(bitamount))) + "\n")
log.close()
except Exception, err:
print err
#main loop for transactions
def transactionLoop(self):
while True:
self.newTransaction()