# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1384194569 -3600
# Node ID 8d27c74f274e9a9cf9a252bb37a268c75835cdbc
# Parent  920b5fd270f9821d59422eaf78ba89118a6c9e7e
Attempt to decode key blocks and return a representation of key properties.

diff -r 920b5fd270f9 -r 8d27c74f274e MoinMessage.py
--- a/MoinMessage.py	Sun Nov 10 23:06:21 2013 +0100
+++ b/MoinMessage.py	Mon Nov 11 19:29:29 2013 +0100
@@ -358,6 +358,48 @@
         text = self.run(["--armor", "--export", keyid])
         return MIMEApplication(text, "pgp-keys", encode_noop)
 
+    def getKeysFromMessagePart(self, part):
+
+        """
+        Process an application/pgp-keys message 'part', returning a list of
+        key details.
+        """
+
+        return self.getKeysFromString(part.get_payload())
+
+    def getKeysFromString(self, s):
+
+        "Return a list of key details extracted from the given string 's'."
+
+        text = self.run(["--with-colons", "--with-fingerprint"], s)
+        keys = []
+
+        for line in text.split("\n"):
+            try:
+                recordtype, trust, keylength, algorithm, keyid, cdate, expdate, serial, ownertrust, _rest = line.split(":", 9)
+            except ValueError:
+                break
+
+            if recordtype == "pub":
+                userid, _rest = _rest.split(":", 1)
+                keys.append({
+                    "type" : recordtype, "trust" : trust, "keylength" : keylength,
+                    "algorithm" : algorithm, "keyid" : keyid, "cdate" : cdate,
+                    "expdate" : expdate, "userid" : userid, "ownertrust" : ownertrust,
+                    "fingerprint" : None, "subkeys" : []
+                    })
+            elif recordtype == "sub" and keys:
+                keys[-1]["subkeys"].append({
+                    "trust" : trust, "keylength" : keylength, "algorithm" : algorithm,
+                    "keyid" : keyid, "cdate" : cdate, "expdate" : expdate,
+                    "ownertrust" : ownertrust
+                    })
+            elif recordtype == "fpr" and keys:
+                fingerprint, _rest = _rest.split(":", 1)
+                keys[-1]["fingerprint"] = fingerprint
+
+        return keys
+
 # Message decoding functions.
 
 # Detect PGP/GPG-encoded payloads.