1 files changed, 107 insertions, 0 deletions
diff --git a/lib/SignedFile.py b/lib/SignedFile.py
new file mode 100755
index 0000000..648186e
--- /dev/null
+++ b/lib/SignedFile.py
@@ -0,0 +1,107 @@
+# SignedFile -*- mode: python; coding: utf-8 -*-
+
+# SignedFile offers a subset of file object operations, and is
+# designed to transparently handle files with PGP signatures.
+
+# Copyright © 2002 Colin Walters <walters@gnu.org>
+#
+# This file 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.
+#
+# 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.
+
+import re,string
+
+class SignedFile:
+    _stream = None
+    _eof = 0
+    _signed = 0
+    _signature = None
+    _signatureversion = None
+    _initline = None
+    def __init__(self, stream):
+        self._stream = stream
+        line = stream.readline()
+        if (line == "-----BEGIN PGP SIGNED MESSAGE-----\n"):
+            self._signed = 1
+            while (1):
+                line = stream.readline()
+                if (len(line) == 0 or line == '\n'):
+                    break
+        else:
+            self._initline = line
+
+    def readline(self):
+        if self._eof:
+            return ''
+        if self._initline:
+            line = self._initline
+            self._initline = None
+        else:
+            line = self._stream.readline()
+        if not self._signed:
+            return line
+        elif line == "-----BEGIN PGP SIGNATURE-----\n":
+            self._eof = 1
+            self._signature = []
+            self._signatureversion = self._stream.readline()
+            self._stream.readline()  # skip blank line
+            while 1:
+                line = self._stream.readline()
+                if len(line) == 0 or line == "-----END PGP SIGNATURE-----\n":
+                    break
+                self._signature.append(line)
+            self._signature = string.join
+            return ''
+        return line
+            
+    def readlines(self):
+        ret = []
+        while 1:
+            line = self.readline()
+            if (line != ''):
+                ret.append(line)
+            else:
+                break
+        return ret
+
+    def close(self):
+        self._stream.close()
+
+    def getSigned(self):
+        return self._signed
+
+    def getSignature(self):
+        return self._signature
+
+    def getSignatureVersion(self):
+        return self._signatureversion
+            
+if __name__=="__main__":
+    import sys
+    if len(sys.argv) == 0:
+        print "Need one file as an argument"
+        sys.exit(1)
+    filename = sys.argv[1]
+    f=SignedFile(open(filename))
+    if f.getSigned():
+        print "**** SIGNED ****"
+    else:
+        print "**** NOT SIGNED ****"
+    lines=f.readlines()
+    print lines
+    if not f.getSigned():
+        assert(len(lines) == len(actuallines))
+    else:
+        print "Signature: %s" % (f.getSignature())
+
+# vim:ts=4:sw=4:et: