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wmts_config_generator.py
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wmts_config_generator.py
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#!/usr/bin/python3
# Automatically generates a QWC2 WMTS background layer configuration, to be added to themesConfig.json
#
# Usage: wmts_config_generator.py <WMTS Capabilities URL> <LayerName> <Projection> [<format>]
#
# Example: wmts_config_generator.py https://www.wmts.nrw.de/geobasis/wmts_nw_dop/1.0.0/WMTSCapabilities.xml nw_dop EPSG:25832
import json
import re
import sys
import urllib.request
from xml.dom.minidom import parseString
def getFirstElementByTagName(parent, name):
try:
return parent.getElementsByTagName(name)[0]
except:
return None
def getFirstElementValueByTagName(parent, name):
try:
return parent.getElementsByTagName(name)[0].firstChild.nodeValue
except:
return ""
if len(sys.argv) < 4:
print("Usage: %s WMTS_Capabilities_URL LayerName Projection [style=default]" % sys.argv[0], file=sys.stderr)
sys.exit(1)
capabilitiesUrl = sys.argv[1]
layerName = sys.argv[2]
crs = sys.argv[3]
styleIdentifier = sys.argv[4] if len(sys.argv) > 4 else ""
try:
response = urllib.request.urlopen(capabilitiesUrl)
except:
print("Failed to download capabilities", file=sys.stderr)
sys.exit(1)
try:
capabilities = parseString(response.read())
except:
print("Failed to parse capabilities", file=sys.stderr)
sys.exit(1)
contents = getFirstElementByTagName(capabilities, "Contents")
# Search for layer
targetLayer = None
for layer in contents.getElementsByTagName("Layer"):
identifier = getFirstElementValueByTagName(layer, "ows:Identifier")
if identifier == layerName:
targetLayer = layer
break
if not targetLayer:
print("Could not find layer %s in capabilities" % layerName, file=sys.stderr)
sys.exit(1)
# Get supported tile matrix
layerTileMatrixSet = []
for tileMatrixSetLink in targetLayer.getElementsByTagName("TileMatrixSetLink"):
layerTileMatrixSet.append(getFirstElementValueByTagName(tileMatrixSetLink, "TileMatrixSet"))
# Get best tile matrix
tileMatrix = None
tileMatrixName = ""
for child in contents.childNodes:
if child.nodeName == "TileMatrixSet":
tileMatrixSet = child
tileMatrixName = getFirstElementValueByTagName(tileMatrixSet, "ows:Identifier")
supportedCrs = getFirstElementValueByTagName(tileMatrixSet, "ows:SupportedCRS")
crsMatch = re.search(r'(EPSG).*:(\d+)', supportedCrs)
if crsMatch and crs == "EPSG:" + crsMatch.group(2) and tileMatrixName in layerTileMatrixSet:
tileMatrix = tileMatrixSet.getElementsByTagName("TileMatrix")
break
if not tileMatrix:
print("Could not find compatible tile matrix", file=sys.stderr)
sys.exit(1)
# Boundingbox
bboxEl = getFirstElementByTagName(layer, "ows:WGS84BoundingBox")
bboxLower = list(map(float, getFirstElementValueByTagName(bboxEl, "ows:LowerCorner").split(" ")))
bboxUpper = list(map(float, getFirstElementValueByTagName(bboxEl, "ows:UpperCorner").split(" ")))
bbox = {
"crs": "EPSG:4326",
"bounds": [bboxLower[0], bboxLower[1], bboxUpper[0], bboxUpper[1]]
}
# Compute origin and resolutions
origin = list(map(float, filter(bool, getFirstElementValueByTagName(tileMatrix[0], "TopLeftCorner").split(" "))))
tileSize = [
int(getFirstElementValueByTagName(tileMatrix[0], "TileWidth")),
int(getFirstElementValueByTagName(tileMatrix[0], "TileHeight"))
]
resolutions = []
for entry in tileMatrix:
scaleDenominator = getFirstElementValueByTagName(entry, "ScaleDenominator")
# 0.00028: assumed pixel width in meters, as per WMTS standard
resolutions.append(float(scaleDenominator) * 0.00028)
# Determine style
if not styleIdentifier:
for style in targetLayer.getElementsByTagName("Style"):
if style.getAttribute("isDefault") == "true":
styleIdentifier = getFirstElementValueByTagName(style, "ows:Identifier")
break
# Resource URL
tileUrl = None
for resourceURL in targetLayer.getElementsByTagName("ResourceURL"):
if resourceURL.getAttribute("resourceType") == "tile":
tileUrl = resourceURL.getAttribute("template")
# Dimensions
for dimension in targetLayer.getElementsByTagName("Dimension"):
dimensionIdentifier = getFirstElementValueByTagName(dimension, "ows:Identifier")
dimensionValue = getFirstElementValueByTagName(dimension, "Default")
tileUrl = tileUrl.replace("{%s}" % dimensionIdentifier, dimensionValue)
# BBox
bounds = []
wgs84BoundingBox = getFirstElementByTagName(targetLayer, "ows:WGS84BoundingBox")
if wgs84BoundingBox is not None:
lowerCorner = list(map(float, filter(bool, getFirstElementValueByTagName(wgs84BoundingBox,"ows:LowerCorner").split(" "))))
upperCorner = list(map(float, filter(bool, getFirstElementValueByTagName(wgs84BoundingBox,"ows:UpperCorner").split(" "))))
bounds = lowerCorner + upperCorner
# Format
format = getFirstElementValueByTagName(targetLayer, "Format")
# RequestEncoding
requestEncoding = ""
operationsMetadata = getFirstElementByTagName(capabilities, "ows:OperationsMetadata")
if operationsMetadata is not None:
for operation in operationsMetadata.getElementsByTagName("ows:Operation"):
if operation.getAttribute("name") == "GetCapabilities":
constraint = getFirstElementByTagName(operation, "ows:Constraint")
if constraint.getAttribute("name") == "GetEncoding":
requestEncoding = getFirstElementValueByTagName(constraint, "ows:Value")
result = {
"type": "wmts",
"url": tileUrl,
"name": layerName,
"format": format,
"requestEncoding": requestEncoding,
"tileMatrixPrefix": "",
"tileMatrixSet": tileMatrixName,
"originX": origin[0],
"originY": origin[1],
"projection": crs,
"tileSize": tileSize,
"style": styleIdentifier,
"bbox": {
"crs": "EPSG:4326",
"bounds": bounds
},
"resolutions": resolutions,
"thumbnail": layerName + ".jpg",
}
print(json.dumps(result, indent=2))