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server/vendor/github.com/pion/webrtc/v3/icecandidate.go

@@ -0,0 +1,172 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package webrtc
+
+import (
+	"fmt"
+
+	"github.com/pion/ice/v2"
+)
+
+// ICECandidate represents a ice candidate
+type ICECandidate struct {
+	statsID        string
+	Foundation     string           `json:"foundation"`
+	Priority       uint32           `json:"priority"`
+	Address        string           `json:"address"`
+	Protocol       ICEProtocol      `json:"protocol"`
+	Port           uint16           `json:"port"`
+	Typ            ICECandidateType `json:"type"`
+	Component      uint16           `json:"component"`
+	RelatedAddress string           `json:"relatedAddress"`
+	RelatedPort    uint16           `json:"relatedPort"`
+	TCPType        string           `json:"tcpType"`
+}
+
+// Conversion for package ice
+
+func newICECandidatesFromICE(iceCandidates []ice.Candidate) ([]ICECandidate, error) {
+	candidates := []ICECandidate{}
+
+	for _, i := range iceCandidates {
+		c, err := newICECandidateFromICE(i)
+		if err != nil {
+			return nil, err
+		}
+		candidates = append(candidates, c)
+	}
+
+	return candidates, nil
+}
+
+func newICECandidateFromICE(i ice.Candidate) (ICECandidate, error) {
+	typ, err := convertTypeFromICE(i.Type())
+	if err != nil {
+		return ICECandidate{}, err
+	}
+	protocol, err := NewICEProtocol(i.NetworkType().NetworkShort())
+	if err != nil {
+		return ICECandidate{}, err
+	}
+
+	c := ICECandidate{
+		statsID:    i.ID(),
+		Foundation: i.Foundation(),
+		Priority:   i.Priority(),
+		Address:    i.Address(),
+		Protocol:   protocol,
+		Port:       uint16(i.Port()),
+		Component:  i.Component(),
+		Typ:        typ,
+		TCPType:    i.TCPType().String(),
+	}
+
+	if i.RelatedAddress() != nil {
+		c.RelatedAddress = i.RelatedAddress().Address
+		c.RelatedPort = uint16(i.RelatedAddress().Port)
+	}
+
+	return c, nil
+}
+
+func (c ICECandidate) toICE() (ice.Candidate, error) {
+	candidateID := c.statsID
+	switch c.Typ {
+	case ICECandidateTypeHost:
+		config := ice.CandidateHostConfig{
+			CandidateID: candidateID,
+			Network:     c.Protocol.String(),
+			Address:     c.Address,
+			Port:        int(c.Port),
+			Component:   c.Component,
+			TCPType:     ice.NewTCPType(c.TCPType),
+			Foundation:  c.Foundation,
+			Priority:    c.Priority,
+		}
+		return ice.NewCandidateHost(&config)
+	case ICECandidateTypeSrflx:
+		config := ice.CandidateServerReflexiveConfig{
+			CandidateID: candidateID,
+			Network:     c.Protocol.String(),
+			Address:     c.Address,
+			Port:        int(c.Port),
+			Component:   c.Component,
+			Foundation:  c.Foundation,
+			Priority:    c.Priority,
+			RelAddr:     c.RelatedAddress,
+			RelPort:     int(c.RelatedPort),
+		}
+		return ice.NewCandidateServerReflexive(&config)
+	case ICECandidateTypePrflx:
+		config := ice.CandidatePeerReflexiveConfig{
+			CandidateID: candidateID,
+			Network:     c.Protocol.String(),
+			Address:     c.Address,
+			Port:        int(c.Port),
+			Component:   c.Component,
+			Foundation:  c.Foundation,
+			Priority:    c.Priority,
+			RelAddr:     c.RelatedAddress,
+			RelPort:     int(c.RelatedPort),
+		}
+		return ice.NewCandidatePeerReflexive(&config)
+	case ICECandidateTypeRelay:
+		config := ice.CandidateRelayConfig{
+			CandidateID: candidateID,
+			Network:     c.Protocol.String(),
+			Address:     c.Address,
+			Port:        int(c.Port),
+			Component:   c.Component,
+			Foundation:  c.Foundation,
+			Priority:    c.Priority,
+			RelAddr:     c.RelatedAddress,
+			RelPort:     int(c.RelatedPort),
+		}
+		return ice.NewCandidateRelay(&config)
+	default:
+		return nil, fmt.Errorf("%w: %s", errICECandidateTypeUnknown, c.Typ)
+	}
+}
+
+func convertTypeFromICE(t ice.CandidateType) (ICECandidateType, error) {
+	switch t {
+	case ice.CandidateTypeHost:
+		return ICECandidateTypeHost, nil
+	case ice.CandidateTypeServerReflexive:
+		return ICECandidateTypeSrflx, nil
+	case ice.CandidateTypePeerReflexive:
+		return ICECandidateTypePrflx, nil
+	case ice.CandidateTypeRelay:
+		return ICECandidateTypeRelay, nil
+	default:
+		return ICECandidateType(t), fmt.Errorf("%w: %s", errICECandidateTypeUnknown, t)
+	}
+}
+
+func (c ICECandidate) String() string {
+	ic, err := c.toICE()
+	if err != nil {
+		return fmt.Sprintf("%#v failed to convert to ICE: %s", c, err)
+	}
+	return ic.String()
+}
+
+// ToJSON returns an ICECandidateInit
+// as indicated by the spec https://w3c.github.io/webrtc-pc/#dom-rtcicecandidate-tojson
+func (c ICECandidate) ToJSON() ICECandidateInit {
+	zeroVal := uint16(0)
+	emptyStr := ""
+	candidateStr := ""
+
+	candidate, err := c.toICE()
+	if err == nil {
+		candidateStr = candidate.Marshal()
+	}
+
+	return ICECandidateInit{
+		Candidate:     fmt.Sprintf("candidate:%s", candidateStr),
+		SDPMid:        &emptyStr,
+		SDPMLineIndex: &zeroVal,
+	}
+}