Generate pdok-viewer json config with xmlstarlet and jq #xmlstarlet #jq #pdok-viewer

gen-viewer-config-wms.sh

#!/usr/bin/env bash
# author: https://github.com/arbakker
# script requirements:
# - curl
# - xmlstarlet
# - jq

PROGRAM_NAME=$(basename "$0")
URL=$1

function usage {
    echo "Generate PDOK Viewer configuration for WMS services."
    echo "Assumes layers are nested in a toplevel Layer element in"
    echo "the cap doc one level deep. "
    echo ""
    echo "usage: $PROGRAM_NAME <wms-cap-url>"
    echo "    - <wms-cap-url>: wms capabilities url, containing"
    echo "      both req params service=wms and request=getcapabilities"
    exit 1
}

function gen-viewer-config-wms() {
    url="$1"
    base_url=$(cut -d"?" -f1 <<<"$url")
    curl --fail -s "$url" |
        xmlstarlet sel -T -N wms="http://www.opengis.net/wms" -t -m '//wms:Layer/wms:Layer' -v \
            'concat(wms:Name/text(), ",", wms:Title/text())' -n |
        jq --slurp --raw-input \
            --arg v "$base_url" \
            'split("\n") | .[:-1] | map(split(",")) |
                map({
                    "technicalName": .[0],
                    "name": .[1],                
                    "legendUrl": ($v + "?service=WMS&request=GetLegendGraphic&format=image%2Fpng&width=20&height=20&version=1.3.0&SLD_VERSION=1.1.0&layer=" + .[0]),
                })'
}

if [ "$#" -ne 1 ]; then
    usage
fi

set -euo pipefail

# ${var,,} syntax to convert to lowercase for case insensitive matching
# regex to check if url contains both service=wms and request=getcapabilities params
if [[ ! "${URL,,}" =~ service=wms.*request=getcapabilities|request=getcapabilities.*service=wms ]]; then
    usage
fi

gen-viewer-config-wms "$URL"