Option to save QR codes as PNG (#2)

* Generate QR code images

Now generates QR images instead of attempting to display the QR code in the console. Places them in a subdirectory of the current directory, entitled "qr"

* Update README.md

* Changes based on suggestions from scito

https://github.com/scito/extract_otp_secret_keys/pull/2#pullrequestreview-555264890

* Update extract_otp_secret_keys.py

Minor formatting changes and clarifications to help text

* Update extract_otp_secret_keys.py

Remove --qr argument, instead opting to respond to --printqr or --saveqr

README.md

@@ -21,7 +21,7 @@ The protobuf package of Google for proto3 is required for running this script.
 
 For printing QR codes, the qrcode module is required
 
-    pip install qrcode
+    pip install qrcode[pil]
 
 ## Technical background
 

extract_otp_secret_keys.py

@@ -46,17 +46,22 @@ import base64
 import fileinput
 import sys
 from urllib.parse import parse_qs, urlencode, urlparse, quote
-
+from os import path, mkdir
+from re import sub, compile as rcompile
 import generated_python.google_auth_pb2
 
 arg_parser = argparse.ArgumentParser()
 arg_parser.add_argument('--verbose', '-v', help='verbose output', action='store_true')
-arg_parser.add_argument('--qr', '-q', help='print QR codes (otpauth://...)', action='store_true')
+arg_parser.add_argument('--saveqr', '-s', help='save QR code(s) as images to the "qr" subfolder', action='store_true')
+arg_parser.add_argument('--printqr', '-p', help='print QR code(s) as text to the terminal', action='store_true')
 arg_parser.add_argument('infile', help='file or - for stdin (default: -) with "otpauth-migration://..." URLs separated by newlines, lines starting with # are ignored')
 args = arg_parser.parse_args()
 
 verbose = args.verbose
-if args.qr:
+saveqr = args.saveqr
+printqr = args.printqr
+
+if saveqr or printqr:
     from qrcode import QRCode
 
 # https://stackoverflow.com/questions/40226049/find-enums-listed-in-python-descriptor-for-protobuf
@@ -68,6 +73,13 @@ def convert_secret_from_bytes_to_base32_str(bytes):
     return str(base64.b32encode(otp.secret), 'utf-8').replace('=', '')
 
 
+def save_qr(data, name):
+    qr = QRCode()
+    qr.add_data(data)
+    img = qr.make_image(fill_color="black", back_color="white")
+    if verbose: print("Saving to {}".format(name))
+    img.save(name)
+
 def print_qr(data):
     qr = QRCode()
     qr.add_data(data)
@@ -85,7 +97,9 @@ for line in (line.strip() for line in fileinput.input(args.infile)):
     if verbose: print(payload)
 
     # pylint: disable=no-member
+    i = 0
     for otp in payload.otp_parameters:
+        i += 1
         print('\nName:   {}'.format(otp.name))
         secret = convert_secret_from_bytes_to_base32_str(otp.secret)
         print('Secret: {}'.format(secret))
@@ -95,6 +109,14 @@ for line in (line.strip() for line in fileinput.input(args.infile)):
         if otp.type == 1: url_params['counter'] = otp.counter
         if otp.issuer: url_params['issuer'] = otp.issuer
         otp_url = 'otpauth://{}/{}?'.format('totp' if otp.type == 2 else 'hotp', quote(otp.name)) + urlencode(url_params)
-        if args.qr:
+        if saveqr:
+            if verbose: print(otp_url)
+            if not(path.exists("qr")): mkdir("qr")
+            pattern = rcompile('[\W_]+')
+            file_otp_name = pattern.sub('', otp.name)
+            file_otp_issuer = pattern.sub('', otp.issuer)
+            if not(file_otp_issuer): print_qr(otp_url, "qr/{}-{}.png".format(i, file_otp_name))
+            if file_otp_issuer: save_qr(otp_url, "qr/{}-{}-{}.png".format(i,file_otp_name, file_otp_issuer))
+        if printqr:
             if verbose: print(otp_url)
             print_qr(otp_url)