I stumbled on your post trying to find a solution myself!
I ended up hardcoding the web service as a Parameter. This gets it past the publish a GP Service validation where ArcGIS Pro detects the URL as a data source not registered with the data store (this was driving me crazy too!). In my case, a Map Service was sufficient for my needs to query information for generating an Excel report.
Parameter objects have an enabled property. When I set it to False, it removes the parameter from being shown in ArcGIS Pro and when you go to publish the Web Tool/GP service, you are no longer harassed by that validation check inspecting all the strings, including URLs. However, how you might hide it from your users in a web map/app would depend on what it is (enabled doesn't really matter outside of it being used in ArcGIS Pro).
For instance, going straight to the ArcGIS Server REST endpoint for the GP Service, I still see all the parameters (.enabled = False has zero impact here). In my case, we're doing this for a client that has VertiGIS, so I create a DisplayForm that only has the parameters I want to show, but looking at ArcGIS Web App Builder and it's Geoprocessing Service, it has a Visible property that could be quickly unchecked for the ones that should remain hidden (screen capture).
def getParameterInfo(self):
"""Define the tool parameters."""
start_date = arcpy.Parameter(
displayName='Start Date',
name='start_date',
datatype='GPDate',
parameterType='Required',
direction='Input')
current_year = dt.datetime.now().year
start_date.value = dt.datetime(current_year, 1, 1)
end_date = arcpy.Parameter(
displayName='End Date',
name='end_date',
datatype='GPDate',
parameterType='Required',
direction='Input')
end_date.value = dt.datetime.now()
# Map Service made into parameter to get around Web Tool publish validation check where ArcGIS inspects all
# strings including URLs and checks if they're data sources.
# If they are, it warns that the service will be copied to the server since it is not a registered data store...
map_service = arcpy.Parameter(
displayName='Map Service',
name='map_service',
datatype='GPString',
parameterType='Required',
direction='Input')
map_service.value = 'https://[domain]/arcgis/rest/services/[folder]/[service name]/MapServer'
map_service.enabled = False # prevents it from being seen
assignments_layer_id = arcpy.Parameter(
displayName='VertiGIS Assignments Table',
name='assignments_layer_id',
datatype='GPLong',
parameterType='Required',
direction='Input')
assignments_layer_id.value = 4
assignments_layer_id.enabled = False
deployments_layer_id = arcpy.Parameter(
displayName='VertiGIS Deployments Table',
name='deployments_layer_id',
datatype='GPLong',
parameterType='Required',
direction='Input')
deployments_layer_id.value = 5
deployments_layer_id.enabled = False
# This will be passed from VertiGIS Workflow by a web request, generating a token at time report is requested.
token = arcpy.Parameter(
displayName='Token',
name='token',
datatype='GPString',
parameterType='Optional', # if not provided, simply runs and doesn't do much!
direction='Input')
report = arcpy.Parameter(
displayName='Excel Report',
name='excel_report',
datatype='DEFile',
parameterType='Derived',
direction='Output')
return [start_date, end_date, map_service, assignments_layer_id, deployments_layer_id, token, report]
def execute(self, parameters, messages):
map_service = [param for param in parameters if param.name == 'map_service'][0].value
assignments_layer_id = [param for param in parameters if param.name == 'assignments_layer_id'][0].value
deployments_layer_id = [param for param in parameters if param.name == 'deployments_layer_id'][0].value
[...]
