Parser/evaluator for the Sieve filtering language (RFC 5228)
Python implementation of the Sieve email filtering language (RFC 5228).
Supports all of the base Sieve spec from RFC 5228, except for features still listed under TODO below
import email import sifter.parser rules = sifter.parser.parse_file(open('my_rules.sieve')) msg = email.message_from_file(open('an_email_to_me.eml')) msg_actions = rules.evaluate(msg)
In the above example, msg_actions is a list of actions to apply to the email message. Each action is a tuple consisting of the action name and action-specific arguments. It is up to the caller to manipulate the message and message store based on the actions returned.
No thought has been given yet to hardening against malicious user input. The current implementation is aimed at users that are running their own sieve scripts.
The current implementation is not optimized for performance, though hopefully it’s not too slow for normal inputs.
In rough order of importance:
An example adaptor that provides Unix LDA behavior using sieve for filtering
Base spec features not yet implemented:
encoded characters (section 126.96.36.199)
multi-line strings (section 2.4.2)
bracketed comments (section 2.3)
message uniqueness (section 2.10.3)
envelope test (section 5.4)
handle message loops (section 10)
limit abuse of redirect action (section 10)
address test should limit allowed headers to those that contain addresses (section 5.1)
Make sure character sets are actually handled according to the spec
Make string parsing comply with the grammar in section 8.1 and the features described in section 2.4.2
Check that python’s email.message implements header comparisons the same way as the sieve spec
Make sure regular expressions are actually handled according to the extension spec
Add support for various extensions:
variables (RFC 5229)
externally stored lists (draft-melnikov-sieve-external-lists)
body (RFC 5173)
relational (RFC 5231)
subaddress (RFC 5233)
copy (RFC 3894)
environment (RFC 5183)
date and index (RFC 5260)
editheader (RFC 5293)
ihave (RFC 5463)
mailbox metadata (RFC 5490)
notifications (RFC 5435), mailto notifications (RFC 5436), xmpp notifications (RFC 5437)
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