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docs and examples: python howto

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* Updated the decryption example code in the HOWTO and the
  corresponding decrypt-file.py script to gracefully handle a
  decryption failure.  This error will always be triggered when GPGME
  is used to try to decrypt an old, MDC-less encrypted message or
  file.
This commit is contained in:
Ben McGinnes 2018-05-23 14:43:06 +10:00
parent 28e3778ce2
commit 3a9e6a8e08
2 changed files with 21 additions and 7 deletions
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9
lang/python/docs/GPGMEpythonHOWTOen.org
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@ -14,7 +14,7 @@
:CUSTOM_ID: intro :CUSTOM_ID: intro
:END: :END:
| Version: | 0.1.0 | | Version: | 0.1.1 |
| Author: | Ben McGinnes <ben@gnupg.org> | | Author: | Ben McGinnes <ben@gnupg.org> |
| Author GPG Key: | DB4724E6FA4286C92B4E55C4321E4E2373590E5D | | Author GPG Key: | DB4724E6FA4286C92B4E55C4321E4E2373590E5D |
| Language: | Australian English, British English | | Language: | Australian English, British English |
@ -673,10 +673,17 @@
newfile = input("Enter path and filename of file to save decrypted data to: ") newfile = input("Enter path and filename of file to save decrypted data to: ")
with open(ciphertext, "rb") as cfile: with open(ciphertext, "rb") as cfile:
try:
plaintext, result, verify_result = gpg.Context().decrypt(cfile) plaintext, result, verify_result = gpg.Context().decrypt(cfile)
except gpg.errors.GPGMEError as e:
plaintext = None
print(e)
if plaintext is not None:
with open(newfile, "wb") as nfile: with open(newfile, "wb") as nfile:
nfile.write(plaintext) nfile.write(plaintext)
else:
pass
#+end_src #+end_src
The data available in =plaintext= in this example is the decrypted The data available in =plaintext= in this example is the decrypted

7
lang/python/examples/howto/decrypt-file.py
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@ -38,7 +38,14 @@ else:
newfile = input("Enter path and filename of file to save decrypted data to: ") newfile = input("Enter path and filename of file to save decrypted data to: ")
with open(ciphertext, "rb") as cfile: with open(ciphertext, "rb") as cfile:
try:
plaintext, result, verify_result = gpg.Context().decrypt(cfile) plaintext, result, verify_result = gpg.Context().decrypt(cfile)
except gpg.errors.GPGMEError as e:
plaintext = None
print(e)
if plaintext is not None:
with open(newfile, "wb") as nfile: with open(newfile, "wb") as nfile:
nfile.write(plaintext) nfile.write(plaintext)
else:
pass