+1 That sounds really cool, and very tricky to document!
Can you do what you need with a community module or will some changes to
core be required?
On Sun, Jan 24, 2016 at 6:15 AM Nuno Miguel Carvalho Oliveira <
[email protected]> wrote:
> Hi,
>
> This community module will allow entering specific request parameters as
> URL path fragments (*REST like URLs*) instead of using the query string.
>
> For example, we want to be able to apply a cql_filter using a URL in the
> following form:
>
> http://<host>:<port>/geoserver/<workspace>/<layer>*/<filter>/*
> ows?service=WMS&version=1.3.0&request=GetMap
>
> As a simple example of usage, if the <filter> is something like:
>
> cql_filter=seq='*K140M*'
>
> the URL would become:
>
> http://<host>:<port>/geoserver/<workspace>/<layer>/*K140M**/*
> ows?service=WMS&version=1.3.0&request=GetMap
>
> and the proposed community module will translate the URL to this new one:
>
> http://<host>:<port>/geoserver/<workspace>/<layer>/
> ows?service=WMS&version=1.3.0&request=GetMap&*cql_filter=seq='K140M'*
>
> This community module could be used to enable *REST like URLs* for
> clients that are not able to consume OGC protocols directly.
>
>
> This module is configured by a set of rules that will allow us to select
> the URLs that should be transformed and describe the transformation to be
> applied:
>
> <Rules>
> <Rule *match*="^.*?(/(a-zA-Z0-9_\-]+))/[^/]+$"
> *parameter*="cql_filter"
> *remove*="$1"
> *transform*="seq='$2'"/>
> <Rule .../>
> </Rules>
>
> The *match *attribute contains a Java Regular Expression
> <https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html>
> that is used for two proposes:
>
> - selecting the URLs that should be transformed
> - extract the pieces of information (*groups*) than can be used to
> describe the transformation.
>
> The *parameter *attribute defines the parameter that should be added to
> the query, in this case the 'cql_filter' parameter.
>
> The *remove *attribute must reference a valid group of the *match *expression
> (typically the must external one) which will be removed from the original
> URL.
>
> The *transform *attribute defines the parameter value content. The
> *transform* string can reference any valid group of the *match*
> expression.
>
>
> This module can be implemented as Servlet Filter which will give us total
> control over when it should be executed (regarding the filters chain), but
> this will make it harder to implement a "plug and play" behavior.
>
> Another option is to implement this module as a filter that extends the
> *GeoServerFilter* and *ExtensionPriority *interfaces, this will make very
> easy to implement the "plug and play" behavior but the filter will be
> executed by the
> *SpringDelegatingFilter* filter which is executed only after the
> *AdvancedDispatchFilter* filter and I'm not sure to understand all the
> implications of this.
>
>
> Any feedback on this is welcome.
>
> Best regards,
>
> Nuno Oliveira
>
>
>
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--
--
Jody Garnett
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