Function createExtractors

middleware/extractor.go:78–114

(lookups string, limit uint)

}

func createExtractors(lookups string, limit uint) ([]ValuesExtractor, error) {
	if lookups == "" {
		return nil, nil
	}
	if limit == 0 {
		limit = 1
	} else if limit > extractorLimit {
		limit = extractorLimit
	}

	sources := strings.SplitSeq(lookups, ",")
	var extractors = make([]ValuesExtractor, 0)
	for source := range sources {
		parts := strings.Split(source, ":")
		if len(parts) < 2 {
			return nil, fmt.Errorf("extractor source for lookup could not be split into needed parts: %v", source)
		}

		switch parts[0] {
		case "query":
			extractors = append(extractors, valuesFromQuery(parts[1], limit))
		case "param":
			extractors = append(extractors, valuesFromParam(parts[1], limit))
		case "cookie":
			extractors = append(extractors, valuesFromCookie(parts[1], limit))
		case "form":
			extractors = append(extractors, valuesFromForm(parts[1], limit))
		case "header":
			prefix := ""
			if len(parts) > 2 {
				prefix = parts[2]
			}
			extractors = append(extractors, valuesFromHeader(parts[1], prefix, limit))
		}
	}
	return extractors, nil
}

// valuesFromHeader returns a functions that extracts values from the request header.
// valuePrefix is parameter to remove first part (prefix) of the extracted value. This is useful if header value has static