Suppose I have QGIS server up and running with some vector data. Now a user accesses this data from a webpage. Would it be possible in some ways for the user to send a request to the QGIS Server and make it do some Vector Geo-processing at the server side and return the results? (For example user sends a select query on a point layer. The Server will calculate the Convex Hull and return the WKT.)
As per the QGIS website,
QGIS Server provides a web map service (WMS) using the same libraries as the Quantum GIS (QGIS) desktop application.
If it is not possible at present, would it be possible to create something like a REST service(i got the term from ArcGIS REST API) which can hold communication between user and QGIS server? What are the difficulties in implementing them?