Function process_layer

lib/utils/index.js:209–311

* Parse layer options * @private * @param {object|*} layer The layer to parse. * @return {string} layer transformation string

(layer)

 * @return {string} layer transformation string
 */
function process_layer(layer) {
  if (isString(layer)) {
    let resourceType = null;
    let layerUrl = '';

    let fetchLayerBegin = 'fetch:';
    if (layer.startsWith(fetchLayerBegin)) {
      layerUrl = layer.substring(fetchLayerBegin.length);
    } else if (layer.indexOf(':fetch:', 0) !== -1) {
      const parts = layer.split(':', 3);
      resourceType = parts[0];
      layerUrl = parts[2];
    } else {
      return layer;
    }

    layer = {
      url: layerUrl,
      type: 'fetch'
    };

    if (resourceType) {
      layer.resource_type = resourceType;
    }
  }

  if (typeof layer !== 'object') {
    return layer;
  }

  let {
    resource_type,
    text,
    type,
    public_id,
    format,
    url: fetchUrl
  } = layer;
  const components = [];

  if (!isEmpty(text) && isEmpty(resource_type)) {
    resource_type = 'text';
  }

  if (!isEmpty(fetchUrl) && isEmpty(type)) {
    type = 'fetch';
  }

  if (!isEmpty(public_id) && !isEmpty(format)) {
    public_id = `${public_id}.${format}`;
  }

  if (isEmpty(public_id) && resource_type !== 'text' && type !== 'fetch') {
    throw new Error('Must supply public_id for non-text overlay');
  }

  if (!isEmpty(resource_type) && resource_type !== 'image') {
    components.push(resource_type);