Django web service helpers to iterate through and return expected parameters from the request object. Static methods can be left generic doing overrides on certain getattrs instead of having to redefine attributes at every stage.

service_helpers.py

# service_helpers.py

def create_img_name(identifier):
    return '%s%s%s' % (identifier, to_unix.to_unix(datetime.now()), randomstring.get_random_string())

def get_params(obs, params, struct='dict'):
    if struct == 'dict':
        values = dict([ (param, obs.get(param)) for param in params if param in obs])
    else:
        values = [(param, obs.get(param)) for param in params]
    return values
 
def get_post_params(request, params):
    return get_params(request.POST, params)
 
def get_get_params(request, params):
    return get_params(request.GET, params)
 
def get_file_params(request, params, path, identifier):
    files = get_params(request.FILES, params, struct='list')
    paths = []
    for file in files:
        file_name = '%s/%s' % (path, create_img_name(identifier))
        file_path = '%s/%s' % (settings.MEDIA_ROOT, file_name)
        destination = open(file_path, 'w')
        if file[1].multiple_chunks():
          for chunk in file[1].chunks():
            destination.write(chunk)
        else:
          destination.write(file[1].read())
        destination.close()
        paths.append({file[0]: file_name})
    print paths
    return paths
    
# service.py

def register(request):
    post_params = ['uname', 'password']
    file_params = ['icon']
    user = User.register(service_helpers.get_post_params(request, post_params))
    user.add_icons(service_helpers.get_file_params(request, file_params, User.ICON_PATH))
    return False