python: Clean up and modernize examples.

* lang/python/examples/Examples.rst: Delete file.
* lang/python/examples/t-edit.py: Likewise.  This is actually a test
case and has been moved to 'tests'.
* lang/python/examples/assuan.py: New file.
* lang/python/examples/decryption-filter.py: Likewise.
* lang/python/examples/delkey.py: Modernize.
* lang/python/examples/encrypt-to-all.py: Likewise.
* lang/python/examples/exportimport.py: Likewise.
* lang/python/examples/genkey.py: Likewise.
* lang/python/examples/inter-edit.py: Likewise.
* lang/python/examples/sign.py: Likewise.
* lang/python/examples/signverify.py: Likewise.
* lang/python/examples/simple.py: Likewise.
* lang/python/examples/testCMSgetkey.py: Likewise.
* lang/python/examples/verifydetails.py: Likewise.

Signed-off-by: Justus Winter <[email protected]>

1 files changed, 35 insertions, 51 deletions

diff --git a/lang/python/examples/encrypt-to-all.py b/lang/python/examples/encrypt-to-all.py
index 5e126760..4586f938 100755
--- a/lang/python/examples/encrypt-to-all.py
+++ b/lang/python/examples/encrypt-to-all.py
@@ -1,21 +1,21 @@
 #!/usr/bin/env python3
+#
+# Copyright (C) 2016 g10 Code GmbH
 # Copyright (C) 2008 Igor Belyi <[email protected]>
 # Copyright (C) 2002 John Goerzen <[email protected]>
 #
-#    This program is free software; you can redistribute it and/or
-#    modify it under the terms of the GNU General Public License as
-#    published by the Free Software Foundation; either version 2 of
-#    the License, or (at your option) any later version.
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
 #
-#    This program 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 General Public License for more details.
+# This program 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
+# General Public License for more details.
 #
-#    You should have received a copy of the GNU General Public License
-#    along with this program; if not, write to the Free Software
-#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-#    02111-1307 USA
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, see <http://www.gnu.org/licenses/>.
 
 """
 This program will try to encrypt a simple message to each key on your
@@ -24,44 +24,28 @@ be skipped and it will re-try the encryption."""
 
 import sys
 import os
-from pyme import core
-from pyme.core import Data, Context
-
-core.check_version(None)
-
-plain = Data('This is my message.')
-
-c = Context()
-c.set_armor(1)
+import pyme
 
-def sendto(keylist):
-    cipher = Data()
-    c.op_encrypt(keylist, 1, plain, cipher)
-    cipher.seek(0, os.SEEK_SET)
-    return cipher.read()
-
-names = []
-for key in c.op_keylist_all(None, 0):
-    try:
-        print(" *** Found key for %s" % key.uids[0].uid)
+with pyme.Context(armor=True) as c:
+    recipients = list()
+    for key in c.keylist():
         valid = 0
-        for subkey in key.subkeys:
-            keyid = subkey.keyid
-            if keyid is None:
-                break
-            can_encrypt = subkey.can_encrypt
-            valid += can_encrypt
-            print("     Subkey %s: encryption %s" %
-                  (keyid, can_encrypt and "enabled" or "disabled"))
-    except UnicodeEncodeError as e:
-        print(e)
-
-    if valid:
-        names.append(key)
-    else:
-        print("     This key cannot be used for encryption; skipping.")
-
-passno = 0
-
-print("Encrypting to %d recipients" % len(names))
-sys.stdout.buffer.write(sendto(names))
+        if any(sk.can_encrypt for sk in key.subkeys):
+            recipients.append(key)
+            print("Adding recipient {0}.".format(key.uids[0].uid))
+
+    ciphertext = None
+    while not ciphertext:
+        print("Encrypting to %d recipients" % len(recipients))
+        try:
+            ciphertext, _, _ = c.encrypt(b'This is my message.',
+                                         recipients=recipients)
+        except pyme.errors.InvalidRecipients as e:
+            print("Encryption failed for these keys:\n{0!s}".format(e))
+
+            # filter out the bad keys
+            bad_keys = {bad.fpr for bad in e.recipients}
+            recipients = [r for r in recipients
+                          if not r.subkeys[0].fpr in bad_keys]
+
+    sys.stdout.buffer.write(ciphertext)