Pigeonhole Sieve Extdata Plugin¶

The extdata plugin adds the vnd.dovecot.extdata extension to the Sieve language. It allows a Sieve script to lookup information from a datasource external to the script. This makes use of Dovecot’s dict mechanism in a read-only manner, meaning that scripts cannot update dict data sources.

Getting the sources¶

Currently, the sources of the extdata plugin are not released, but you can get them from the their Git repository.

For Pigeonhole v0.4:

git clone -b core-0.4 https://github.com/stephanbosch/sieve-extdata-plugin.git

For Pigeonhole v0.5:

git clone -b core-0.5 https://github.com/stephanbosch/sieve-extdata-plugin.git

Compiling¶

If you downloaded the sources of this plugin using Git, you will need to execute ./autogen.sh first to build the automake structure in your source tree. This process requires autotools and libtool to be installed.

If you installed Dovecot from sources, the plugin’s configure script should be able to find the installed dovecot-config automatically, along with the Pigeonhole development headers:

./configure
make
sudo make install

If this doesn’t work, you can use --with-dovecot=<path> configure option, where the path points to a directory containing dovecot-config file. This can point to an installed file:

./configure --with-dovecot=/usr/local/lib/dovecot
make
sudo make install

The above example should also find the necessary Pigeonhole development headers implicitly. You can also compile by pointing to compiled Dovecot and Pigeonhole source trees:

./configure --with-dovecot=../dovecot-2.3.2/ --with-pigeonhole=../dovecot-2.3-pigeonhole-0.5.2
make
sudo make install

Configuration¶

This package builds and installs the sieve_extdata plugin for Pigeonhole Sieve. The plugin is activated by adding it to the sieve_plugins setting

sieve_plugins = sieve_extdata

The following configuration settings are used:

Settings¶

sieve_extdata_dict_uri¶

Default: <empty>
Values: String

Specifies the URI of the dict that is used for extdata lookups.

Example:

plugin {
  sieve = ~/.dovecot.sieve
  sieve_plugins = sieve_extdata

  sieve_extdata_dict_uri = file:/etc/dovecot/pigeonhole-sieve.dict
}

Usage¶

Sieve scripts can use the new vnd.dovecot.extdata extension as follows:

require ["variables", "vacation", "vnd.dovecot.extdata"];

vacation :days 30 :subject "${extdata.vacation_subject}" "${extdata.vacation_message}";
keep;

where “priv/vacation_subject” & “priv/vacation_message” would be looked up in the Dovecot dict. See below for some example dicts:

Dict with flat file backend¶

To use a flat file backend for the above example, create a dict file with the following format (for example /etc/dovecot/sieve-extdata-lookup.dict):

priv/vacation_message
Sorry I am out of the office

Dict with a SQL backend¶

To use a SQL backend for the above example, first set up a dict proxy. In /etc/dovecot.conf:

dict {
    sieve = mysql:/etc/dovecot/pigeonhole-sieve.dict
}

And in /etc/dovecot/pigeonhole-sieve.dict:

connect = host=localhost dbname=dovecot user=dovecot password=password

map {
  pattern = priv/vacation_message   # The dict value to lookup
  table = virtual_users             # The SQL table to perform the lookup in
  username_field = email            # The username field to search on in the table
  value_field = vacation_msg        # The database value to return
}

Finally configure extdata to use the proxy:

sieve_extdata_dict_uri = proxy::sieve

Read the (preliminary) specification for more information.