A RESTful interface is coming

Again and again, dbmail administrators ask us about the best way for their application to talk to dbmail. And our answer has always been the same: talk IMAP.

However, IMAP is a notorious protocol for many. Not because it is inherently evil, but because creating a parser for imap formatted data is not a trivial thing. It's simply a lot of work, and easy to get wrong. It's also top-heavy; a lot of the capabilities in IMAP are simply not needed at all by your typical webapp developer.

So the question was: how can we design a solution that will allow an application developer to quickly integrate with dbmail, using standard tools and languages.

Being forward compatible could be considered a secondary, but no less important requirement. The chosen approach - short of IMAP - often comes as custom build queries talking directly with the database backend. Few if any who walked this path, spent any effort on supporting database servers other than the one they use. This does not make for long-term viability, and does not support the community at large. Also, dbmail's schema has and will - quite possibly - change. Retrieving a message from the database was simple, but is no longer. Finally, not being able to leverage the scalability features included in the recent releases means you have to worry about a denial of service on your database server when the number of visitors of your webapp increases.

So enters a solution: dbmail-httpd. A simple event-driven daemon that will expose the object model of dbmail through a RESTful interface. A php5 userland module will also be provided both to test the interface and to demonstrate the power of this approach. Where possible, requested data will be returned as JSON. This makes parsing completely trivial of course.

It is our hope and expectation that this will drive development for a new class of webmail interfaces built on top of dbmail, but also enable construction of a new - and native - administration interface that will not require additional hosting sit-ups.

so stay tuned for more.

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