def handle_wmts(nocase_args):
operation = nocase_args.get("request", "").upper()
# WMS operation Map
if not operation:
raise WMTSException("No operation specified", locator="Request parameter")
elif operation == "GETCAPABILITIES":
return get_capabilities(nocase_args)
elif operation == "GETTILE":
return get_tile(nocase_args)
elif operation == "GETFEATUREINFO":
return get_feature_info(nocase_args)
else:
raise WMTSException("Unrecognised operation: %s" % operation, WMTSException.OPERATION_NOT_SUPPORTED,
"Request parameter")
def get_tile(args):
wms_args = wmts_args_to_wms(args)
try:
return get_map(wms_args)
except WMSException as wmse:
first_error = wmse.errors[0]
e = WMTSException(first_error["msg"],
code=first_error["code"],
locator=first_error["locator"],
http_response=wmse.http_response)
for error in wmse.errors[1:]:
e.add_error(error["msg"], code=error["code"], locator=error["locator"])
raise e
def get_feature_info(args):
wms_args = wmts_args_to_wms(args)
wms_args["query_layers"] = wms_args["layers"]
try:
return feature_info(wms_args)
except WMSException as wmse:
first_error = wmse.errors[0]
e = WMTSException(first_error["msg"],
code=first_error["code"],
locator=first_error["locator"],
http_response=wmse.http_response)
for error in wmse.errors[1:]:
e.add_error(error["msg"], code=error["code"], locator=error["locator"])
raise e
def get_capabilities(args):
# TODO: Handle updatesequence request parameter for cache consistency.
# Note: Only WMS v1.0.0 exists at this stage, so no version negotiation is necessary
# Extract layer metadata from Datacube.
platforms = get_layers(refresh=True)
service_cfg = get_service_cfg()
url = args.get('Host', args['url_root'])
base_url = get_service_base_url(service_cfg.allowed_urls, url)
section = args.get("section")
if section:
section = section.lower()
show_service_id = False
show_service_provider = False
show_ops_metadata = False
show_contents = False
show_themes = False
if section is None:
show_service_id = True
show_service_provider = True
show_ops_metadata = True
show_contents = True
show_themes = True
else:
sections = section.split(",")
for s in sections:
if s == "all":
show_service_id = True
show_service_provider = True
show_ops_metadata = True
show_contents = True
show_themes = True
elif s == "serviceidentification":
show_service_id = True
elif s == "serviceprovider":
show_service_provider = True
elif s == "operationsmetadata":
show_ops_metadata = True
elif s == "contents":
show_contents = True
elif s == "themes":
show_themes = True
else:
raise WMTSException("Invalid section: %s" % section,
WMTSException.INVALID_PARAMETER_VALUE,
locator="Section parameter")
return (render_template("wmts_capabilities.xml",
service=service_cfg,
platforms=platforms,
base_url=base_url,
show_service_id=show_service_id,
show_service_provider=show_service_provider,
show_ops_metadata=show_ops_metadata,
show_contents=show_contents,
show_themes=show_themes,
webmerc_ss=WebMercScaleSet), 200,
resp_headers({
"Content-Type": "application/xml",
"Cache-Control": "no-cache,max-age=0"
}))
def wmts_args_to_wms(args):
layer = args.get("layer")
style = args.get("style")
format_ = args.get("format")
time = args.get("time", "")
tileMatrixSet = args.get("tilematrixset")
tileMatrix = args.get("tilematrix")
row = args.get("tilerow")
col = args.get("tilecol")
wms_args = {
"version": "1.3.0",
"service": "WMS",
"request": "GetMap",
"styles": style,
"layers": layer,
"time": time,
"width": 256,
"height": 256,
"format": format_,
"exceptions": "application/vnd.ogc.se_xml",
"crs": "EPSG:3857",
"requestid": args["requestid"]
}
if tileMatrixSet not in ("urn:ogc:def:wkss:OGC:1.0:GoogleMapsCompatible", "WholeWorld_WebMercator"):
raise WMTSException("Invalid Tile Matrix Set: " + tileMatrixSet)
try:
tileMatrix = int(tileMatrix)
if tileMatrix < 0 or tileMatrix >= len(WebMercScaleSet):
raise WMTSException("Invalid Tile Matrix: " + tileMatrix)
except ValueError:
raise WMTSException("Invalid Tile Matrix: " + tileMatrix)
try:
row = int(row)
except ValueError:
raise WMTSException("Invalid Tile Row: " + row)
try:
col = int(col)
except ValueError:
raise WMTSException("Invalid Tile Col: " + col)
tileMatrixMinX=-20037508.3427892
tileMatrixMaxY=20037508.3427892
tileSpan = WebMercScaleSet[tileMatrix] * 0.00028 * 256
leftX = col * tileSpan + tileMatrixMinX
upperY = tileMatrixMaxY - row * tileSpan
rightX = (col + 1) * tileSpan + tileMatrixMinX
lowerY = tileMatrixMaxY - (row + 1) * tileSpan
wms_args["bbox"] = "%f,%f,%f,%f" % (
leftX, lowerY, rightX, upperY
)
# GetFeatureInfo only args
if "i" in args:
wms_args["i"] = args["i"]
wms_args["j"] = args.get("j", "")
wms_args["info_format"] = args.get("infoformat", "")
return wms_args