Hi List,
we are back working on the "Direct Download links from CSW" topic started
by Andrea some months ago.
We would like to share some opinions on it in order to collect couple of
feedbacks.
Summarizing the main concept and restoring previous discussions:
For a Layer, we would like to enable a "DirectDownload" capability.
(We can consider adding a checkBox on wicket in the layer config panel,as
well as a Global option to enable/disable this operation).
Then, for that layer we would like to provide a DirectDownload of the raw
data as part of a CSW record/metadata, something like:
http://host:port/geoserver/ows?service
=CSW&version=2.0.1&request=DirectDownload&resourceId=<layerName>
As you know, an ImageMosaic based layer may refer to multiple files so we
will show several links (1 for each file composing the mosaic) with
summarizing details on dimensions ranges for that file. Something like this:
http://host:port/geoserver/ows?service=CSW&version=2.0.1&;
request=DirectDownload&resourceId=<layerName>:<fileName>&time=from/to&
elevation=from/to&bbox=xmin,ymin,xmax,ymax&custDim=from/to
At the moment, CSW entries are built through a static mapping based on
property file which allows to populate CSW keys from internal GeoServer
Catalog elements.
As an instance, quoting some entries from Record.default.properties mapping
file:
*title.value=if_then_else(isNull(title), name, title)*
*creator.value='GeoServer Catalog'*
*subject.value=keywords*
*abstract.value=abstract*
CatalogStoreMappingElements are Key,Expression pairs.
Adding a new entry to the mapping for this new capability could be an
option but I'm a bit against that since it depends on status of global
Download enabled.
Moreover, it could be tricky to encode the mapping as an Expression (to be
supported by a FilterFunction).
Therefore, we are thinking about 2 alternative options:
1) Adding a way to change the mappings before they are applied.
We could think about adding a mechanism which checks if the layer has the
DirectDownload capability enabled and then add a new mapping element which
queries the underlying store to return the associated files to be used to
setup the link.
2) Setting up a plugin (something like a FeatureCustomizer) which
customizes the feature being built by the RecordBuilder, in order to add
the download link.
What do you think about it?
Any feedback will be appreciated.
Cheers,
Daniele
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