def get_jsonpath_query()

in python/website/research_pacs/website/permission.py [0:0]

• 14 lines of code
• 11 McCabe index (conditional complexity)

  def get_jsonpath_query(self, query):
    """
    The solution makes JSONPath queries to the PostgreSQL database to find DICOM instances that 
    match specific criteria. This function translate the "human-readable" query like `Modality 
    StrEquals CT` into a JSONPath, and apply eventual profile-specific JSONPath queries that 
    restrict access to a subset of DICOM instances (attribute `DICOMQueryFilter`).
    
    Args:
      query (str): Input query
    
    """
    jsonpath_query = rpacs_dicom_json.translate_query_to_jsonpath(query)
    matching_profiles = self._get_matching_profiles()
    raise_error_if_no_permission(matching_profiles)
    
    # Return `jsonpath_query` if at least one matching profile allows access to all DICOM 
    # instances without restriction (`DICOMQueryFilter` is not specified or empty for this 
    # profile)
    for profile_name in matching_profiles:
      profile = self._permissions['Profiles'][profile_name]
      if not 'DICOMQueryFilter' in profile or profile['DICOMQueryFilter'] == '':
        return jsonpath_query
    
    # The current user can access a given DICOM instance if any of the matching profiles allows 
    # access (JSONPath queries connected by an OR operand)
    jsonpath_profiles = [self._permissions['Profiles'][profile_name]['JSONPathQuery'] for profile_name in matching_profiles]
    jsonpath_filter = '(' + ')||('.join(jsonpath_profiles) + ')'
    
    # If `query` is empty, return only the "filtering" JSONPath query issued from the matching 
    # profiles. Otherwise, the resulting JSONPath query is an AND expression between the user 
    # query `jsonpath_query` and the filter query `jsonpath_filter`
    if query == '':
      return jsonpath_filter
    else:
      return f"(({jsonpath_query})&&{jsonpath_filter})"