code: def showmapfile(self,datastore_id=None, datasource_id=None):
          
          datastore = self._get_datastore_by_id(datastore_id)
          if datastore is None:
              abort(404)
          classification = None
          if 'classification' in request.params and 'attribute' in request.params:
              classification = {}
              classification['type'] = request.params['classification']
              classification['attribute'] = request.params['attribute']
              if classification['type'] == "quantile":
                  classification['intervals'] = request.params['intervals']
              
              palette = {}
              palette['type']='ramp'
              if 'colortype' in request.params:
                  palette['type'] = request.params['colortype']
              if 'startcolor' in request.params:
                  c = request.params['startcolor']
                  if c.startswith('#'):
                      c = c[1:]
                  palette['startcolor'] = [int(c[0:2],16),int(c[2:4],16),int(c[4:6],16)]
              if 'endcolor' in request.params:
                  c = request.params['endcolor']
                  if c.startswith('#'):
                      c = c[1:]
                  palette['endcolor'] = [int(c[0:2],16),int(c[2:4],16),int(c[4:6],16)]
              if 'interpolation' in request.params:
                  palette['interpolation'] = request.params['interpolation']
              if 'theme' in request.params:
                  palette['theme'] = int(request.params['theme'])
              classification['palette'] = palette
  
          mapfile = get_mapfile(datastore.ogrstring, datasource_id, classification)
          if 'metadata' not in mapfile:
              mapfile['metadata']={}
          mapfile['metadata']['datastoreid']=datastore_id
          mapfile['metadata']['datasourceid']=datasource_id
          if mapfile is None:
              abort(404)
          return mapfile
docs: GET /datastores/{datastore_id}/datasources/{datasource_id}/mapfile: Get
              the JSON representation of a specific datasource's default MapFile LAYER
              block.