/*
 * Copyright (c) 2018, Psiphon Inc.
 * All rights reserved.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package common

// APIParameters is a set of API parameter values, typically received
// from a Psiphon client and used/logged by the Psiphon server. The
// values are of varying types: strings, ints, arrays, structs, etc.
type APIParameters map[string]interface{}

// Add copies API parameters from b to a, skipping parameters which already
// exist, regardless of value, in a.
func (a APIParameters) Add(b APIParameters) {
	for name, value := range b {
		_, ok := a[name]
		if !ok {
			a[name] = value
		}
	}
}

// APIParameterValidator is a function that validates API parameters
// for a particular request or context.
type APIParameterValidator func(APIParameters) error

// GeoIPData is type-compatible with psiphon/server.GeoIPData.
type GeoIPData struct {
	Country string
	City    string
	ISP     string
	ASN     string
	ASO     string
}

// APIParameterLogFieldFormatter is a function that returns formatted
// LogFields containing the given GeoIPData and APIParameters. An optional
// log field name prefix string, when specified, should be applied to the
// output LogFields names. When GeoIPData is the zero value, it should be
// omitted from LogFields.
type APIParameterLogFieldFormatter func(string, GeoIPData, APIParameters) LogFields