handshake.go

package kahoot

import "errors"

func (c *Connection) Handshake() error {
	advice := map[string]int{"timeout": 60000, "interval": 0}
	content := map[string]interface{}{"version": "1.0", "minimumVersion": "1.0",
		"supportedConnectionTypes": []string{"websocket"},
		"advice":                   advice}
	pack := c.Packet("/meta/handshake", content)
	if err := c.WriteAck(pack, true); err != nil {
		return err
	}
	res, err := c.ReadId(pack.Id)
	if err != nil {
		return err
	}

	// Check the 'successful' field
	success, ok := res.Content["successful"].(bool)
	if !ok || !success {
		return errors.New("Negative 'successful' field.")
	}

	// Read the 'clientId' field
	c.clientId, ok = res.Content["clientId"].(string)
	if !ok {
		return errors.New("No 'clientId' response field")
	}

	return nil
}