From 75050366da87747b7f7ec6a0c3213966c3bc8059 Mon Sep 17 00:00:00 2001
From: Evgeny Fadeev <evgeny.fadeev@gmail.com>
Date: Wed, 24 Apr 2013 03:58:34 -0400
Subject: improved handling of user signature extraction

---
 askbot/mail/__init__.py        | 20 +++++++++++---------
 askbot/mail/lamson_handlers.py | 22 ++++++++++------------
 2 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/askbot/mail/__init__.py b/askbot/mail/__init__.py
index 826e2b89..37d10f8b 100644
--- a/askbot/mail/__init__.py
+++ b/askbot/mail/__init__.py
@@ -298,6 +298,8 @@ def extract_user_signature(text, reply_code):
     """extracts email signature as text trailing
     the reply code"""
     stripped_text = strip_tags(text)
+
+    signature = ''
     if reply_code in stripped_text:
         #extract the signature
         tail = list()
@@ -314,13 +316,10 @@ def extract_user_signature(text, reply_code):
 
         signature = '\n'.join(tail)
 
-        #patch signature to a sentinel value if it is truly empty, because we
-        #cannot allow empty signature field, which indicates no
-        #signature at all and in that case we ask user to create one
-        if signature == '':
-            signature = 'empty signature'
-    else:
-        return None
+    #patch signature to a sentinel value if it is truly empty, because we
+    #cannot allow empty signature field, which indicates no
+    #signature at all and in that case we ask user to create one
+    return signature or 'empty signature'
 
 
 def process_parts(parts, reply_code=None):
@@ -388,12 +387,15 @@ def process_emailed_question(
 
             stripped_body_text = user.strip_email_signature(body_text)
 
-            signature_not_detected = (stripped_body_text == body_text)
+            #note that signature '' means it is unset and 'empty signature' is a sentinel
+            #because there is no other way to indicate unset signature without adding
+            #another field to the user model
+            signature_changed = (stripped_body_text == body_text and user.email_signature)
 
             need_new_signature = (
                 user.email_isvalid is False or
                 user.email_signature == '' or
-                signature_not_detected
+                signature_changed
             )
             
             #ask for signature response if user's email has not been
diff --git a/askbot/mail/lamson_handlers.py b/askbot/mail/lamson_handlers.py
index 5008918e..728203e6 100644
--- a/askbot/mail/lamson_handlers.py
+++ b/askbot/mail/lamson_handlers.py
@@ -278,21 +278,19 @@ def PROCESS(
 
     #2) process body text and email signature
     user = reply_address_object.user
-    if signature is not None:#if there, then it was stripped
-        if signature != user.email_signature:
-            user.email_signature = signature
-    else:#try to strip signature
-        stripped_body_text = user.strip_email_signature(body_text)
-        #todo: add test cases for emails without the signature
-        if stripped_body_text == body_text and user.email_signature:
-            #todo: send an email asking to update the signature
-            raise ValueError('email signature changed or unknown')
-        body_text = stripped_body_text
-
-    #3) validate email address and save user
+
+    if signature != user.email_signature:
+        user.email_signature = signature
+
+    #3) validate email address and save user along with maybe new signature
     user.email_isvalid = True
     user.save()#todo: actually, saving is not necessary, if nothing changed
 
+    #here we might be in danger of chomping off some of the 
+    #message is body text ends with a legitimate text coinciding with
+    #the user's email signature
+    body_text = user.strip_email_signature(body_text)
+
     #4) actually make an edit in the forum
     robj = reply_address_object
     add_post_actions = ('post_comment', 'post_answer', 'auto_answer_or_comment')
-- 
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