53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
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package proto
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import (
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"encoding/binary"
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"time"
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"github.com/pion/stun"
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)
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// DefaultLifetime in RFC 5766 is 10 minutes.
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//
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// RFC 5766 Section 2.2
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const DefaultLifetime = time.Minute * 10
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// Lifetime represents LIFETIME attribute.
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//
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// The LIFETIME attribute represents the duration for which the server
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// will maintain an allocation in the absence of a refresh. The value
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// portion of this attribute is 4-bytes long and consists of a 32-bit
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// unsigned integral value representing the number of seconds remaining
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// until expiration.
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//
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// RFC 5766 Section 14.2
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type Lifetime struct {
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time.Duration
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}
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// uint32 seconds
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const lifetimeSize = 4 // 4 bytes, 32 bits
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// AddTo adds LIFETIME to message.
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func (l Lifetime) AddTo(m *stun.Message) error {
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v := make([]byte, lifetimeSize)
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binary.BigEndian.PutUint32(v, uint32(l.Seconds()))
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m.Add(stun.AttrLifetime, v)
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return nil
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}
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// GetFrom decodes LIFETIME from message.
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func (l *Lifetime) GetFrom(m *stun.Message) error {
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v, err := m.Get(stun.AttrLifetime)
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if err != nil {
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return err
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}
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if err = stun.CheckSize(stun.AttrLifetime, len(v), lifetimeSize); err != nil {
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return err
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}
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_ = v[lifetimeSize-1] // asserting length
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seconds := binary.BigEndian.Uint32(v)
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l.Duration = time.Second * time.Duration(seconds)
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return nil
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}
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