Andrea,
This looks like precisely what I was looking for but having trouble finding. Thanks a ton for assisting me in pinpointing how I needed to interface with the system.
Thanks again,
David Marks
From: Andrea Aime <andrea.aime@anonymised.com<mailto:andrea.aime@anonymised.com>>
Date: Monday, December 8, 2014 at 9:21 AM
To: David Marks <david.marks@anonymised.com<mailto:david.marks@anonymised.com>>
Cc: Geoserver-devel <geoserver-devel@lists.sourceforge.net<mailto:geoserver-devel@lists.sourceforge.net>>
Subject: Re: [Geoserver-devel] WMS Request Intercept Extension
On Mon, Dec 8, 2014 at 2:12 PM, Marks, David <David.Marks@anonymised.com<mailto:David.Marks@anonymised.com>> wrote:
Good morning GeoServer-devel,
For a project I am currently working on I need to intercept incoming WMS getCapabilities/getMap requests and their outbound responses in order to perform some arbitrary pre- and post-processing. Is inserting my control flow into the WMS request/response capable via GeoServer extensions and, if so, could anyone provide some help in identifying the programmatic hooks I should be grabbing onto in order to get that level of control? If not, could I use a side-servlet to capture incoming responses and pass them to GeoServer programmatically? Again, if yes, identification of what classes/methods provide said access would aid me greatly.
The generic OGC service lifecycle callback is called DispatcherCallback:
https://github.com/geoserver/geoserver/blob/793476e348e906a2ee9db8fa8f73a4fb464f3288/src/ows/src/main/java/org/geoserver/ows/DispatcherCallback.java
There are several instances of these in GeoServer, for example to monitor and log requests:
https://github.com/geoserver/geoserver/blob/793476e348e906a2ee9db8fa8f73a4fb464f3288/src/extension/monitor/core/src/main/java/org/geoserver/monitor/ows/MonitorCallback.java
to check security:
https://github.com/geoserver/geoserver/blob/793476e348e906a2ee9db8fa8f73a4fb464f3288/src/main/src/main/java/org/geoserver/security/OperationSecurityCallback.java
or to manipulate requests:
https://github.com/geoserver/geoserver/blob/793476e348e906a2ee9db8fa8f73a4fb464f3288/src/community/wms-eo/src/main/java/org/geoserver/wms/eo/EOGetFeatureInfoChecker.java
All of them are registered in the Spring applicationContext.xml file contained in the same module.
The main advantage of these is that you get the request already parsed into a Java object, which is handy since each OGC
request can be sent in a variety of ways. If instead you want something lower level, you can always implement a ServletFilter
Cheers
Andrea
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