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server/vendor/github.com/pion/ice/v2/icecontrol.go

@@ -0,0 +1,90 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package ice
+
+import (
+	"encoding/binary"
+
+	"github.com/pion/stun"
+)
+
+// tiebreaker is common helper for ICE-{CONTROLLED,CONTROLLING}
+// and represents the so-called tiebreaker number.
+type tiebreaker uint64
+
+const tiebreakerSize = 8 // 64 bit
+
+// AddToAs adds tiebreaker value to m as t attribute.
+func (a tiebreaker) AddToAs(m *stun.Message, t stun.AttrType) error {
+	v := make([]byte, tiebreakerSize)
+	binary.BigEndian.PutUint64(v, uint64(a))
+	m.Add(t, v)
+	return nil
+}
+
+// GetFromAs decodes tiebreaker value in message getting it as for t type.
+func (a *tiebreaker) GetFromAs(m *stun.Message, t stun.AttrType) error {
+	v, err := m.Get(t)
+	if err != nil {
+		return err
+	}
+	if err = stun.CheckSize(t, len(v), tiebreakerSize); err != nil {
+		return err
+	}
+	*a = tiebreaker(binary.BigEndian.Uint64(v))
+	return nil
+}
+
+// AttrControlled represents ICE-CONTROLLED attribute.
+type AttrControlled uint64
+
+// AddTo adds ICE-CONTROLLED to message.
+func (c AttrControlled) AddTo(m *stun.Message) error {
+	return tiebreaker(c).AddToAs(m, stun.AttrICEControlled)
+}
+
+// GetFrom decodes ICE-CONTROLLED from message.
+func (c *AttrControlled) GetFrom(m *stun.Message) error {
+	return (*tiebreaker)(c).GetFromAs(m, stun.AttrICEControlled)
+}
+
+// AttrControlling represents ICE-CONTROLLING attribute.
+type AttrControlling uint64
+
+// AddTo adds ICE-CONTROLLING to message.
+func (c AttrControlling) AddTo(m *stun.Message) error {
+	return tiebreaker(c).AddToAs(m, stun.AttrICEControlling)
+}
+
+// GetFrom decodes ICE-CONTROLLING from message.
+func (c *AttrControlling) GetFrom(m *stun.Message) error {
+	return (*tiebreaker)(c).GetFromAs(m, stun.AttrICEControlling)
+}
+
+// AttrControl is helper that wraps ICE-{CONTROLLED,CONTROLLING}.
+type AttrControl struct {
+	Role       Role
+	Tiebreaker uint64
+}
+
+// AddTo adds ICE-CONTROLLED or ICE-CONTROLLING attribute depending on Role.
+func (c AttrControl) AddTo(m *stun.Message) error {
+	if c.Role == Controlling {
+		return tiebreaker(c.Tiebreaker).AddToAs(m, stun.AttrICEControlling)
+	}
+	return tiebreaker(c.Tiebreaker).AddToAs(m, stun.AttrICEControlled)
+}
+
+// GetFrom decodes Role and Tiebreaker value from message.
+func (c *AttrControl) GetFrom(m *stun.Message) error {
+	if m.Contains(stun.AttrICEControlling) {
+		c.Role = Controlling
+		return (*tiebreaker)(&c.Tiebreaker).GetFromAs(m, stun.AttrICEControlling)
+	}
+	if m.Contains(stun.AttrICEControlled) {
+		c.Role = Controlled
+		return (*tiebreaker)(&c.Tiebreaker).GetFromAs(m, stun.AttrICEControlled)
+	}
+	return stun.ErrAttributeNotFound
+}