So, we have an attribute "symbol" that clearly contains a valid https URL
to a valid gif. If we use:
<sld:ExternalGraphic>
<sld:OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink";
xlink:type="simple" xlink:href="${symbol}"/>
<sld:Format>image/gif</sld:Format>
</sld:ExternalGraphic>
We see a bunch of errors in the log saying:
WARN [org.geotools.renderer.style] - Unable to read image at file:/<our
data dir>/styles/https://<rest of the url>
If we change it to:
xlink:href="https://${strSubstringStart(symbol, 8)}"
Works like a charm.
Jason Newmoyer
Newmoyer Geospatial Solutions
843.606.0424
[email protected]
On Thu, Jul 26, 2018 at 8:52 AM, Andrea Aime <[email protected]>
wrote:
> Hi Jason,
> I believe that right now the above statement is no more valid... the
> history of this is complicated and I'm not sure I remember it properly,
> but believe it went like this:
>
> - Originally the system allowed any kind of string, allowing dynamic
> URLs of any kind
> - Then someone weaving a OGC labelled baton came and switched the very
> API to use URL, making it impossible to use addresses that were not a valid
> URl
> - After a while and seeing the issues it caused the "common sense
> brigade" fought back and added the pure string approach back, making it
> possible to use whatever address again (or at least hoping to do so)
>
> So could you let us know, what is it that you tried, and that did not work?
>
> Cheers
> Andrea
>
> On Wed, Jul 25, 2018 at 5:00 PM Jason Newmoyer <
> [email protected]> wrote:
>
>> After some confusion, I discovered this note in the docs:
>>
>> Note
>>
>>
>> Currently xlink:href strings must be valid URLs *before* expression
>> expansion is performed. This means that the URL cannot be completely
>> provided by an expression. The xlink:href string must explicitly include
>> at least the prefix http://
>>
>>
>> http://docs.geoserver.org/latest/en/user/styling/sld/
>> extensions/pointsymbols.html#dynamic-symbolizers
>>
>> If its a relatively simple change to lift this restriction, I'd be
>> willing to do it. Can someone point me toward the relevant code?
>>
>> Thanks,
>>
>> Jason Newmoyer
>> Newmoyer Geospatial Solutions
>> 843.606.0424
>> [email protected]
>>
>>
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>
>
> --
>
> Regards, Andrea Aime == GeoServer Professional Services from the experts!
> Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime
> @geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054
> Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339
> 8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it
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