93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
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package webrtc
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import (
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"github.com/pion/sdp/v3"
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)
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// DTLSRole indicates the role of the DTLS transport.
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type DTLSRole byte
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const (
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// DTLSRoleAuto defines the DTLS role is determined based on
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// the resolved ICE role: the ICE controlled role acts as the DTLS
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// client and the ICE controlling role acts as the DTLS server.
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DTLSRoleAuto DTLSRole = iota + 1
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// DTLSRoleClient defines the DTLS client role.
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DTLSRoleClient
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// DTLSRoleServer defines the DTLS server role.
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DTLSRoleServer
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)
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const (
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// https://tools.ietf.org/html/rfc5763
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/*
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The answerer MUST use either a
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setup attribute value of setup:active or setup:passive. Note that
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if the answerer uses setup:passive, then the DTLS handshake will
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not begin until the answerer is received, which adds additional
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latency. setup:active allows the answer and the DTLS handshake to
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occur in parallel. Thus, setup:active is RECOMMENDED.
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*/
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defaultDtlsRoleAnswer = DTLSRoleClient
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/*
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The endpoint that is the offerer MUST use the setup attribute
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value of setup:actpass and be prepared to receive a client_hello
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before it receives the answer.
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*/
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defaultDtlsRoleOffer = DTLSRoleAuto
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)
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func (r DTLSRole) String() string {
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switch r {
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case DTLSRoleAuto:
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return "auto"
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case DTLSRoleClient:
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return "client"
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case DTLSRoleServer:
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return "server"
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default:
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return unknownStr
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}
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}
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// Iterate a SessionDescription from a remote to determine if an explicit
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// role can been determined from it. The decision is made from the first role we we parse.
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// If no role can be found we return DTLSRoleAuto
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func dtlsRoleFromRemoteSDP(sessionDescription *sdp.SessionDescription) DTLSRole {
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if sessionDescription == nil {
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return DTLSRoleAuto
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}
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for _, mediaSection := range sessionDescription.MediaDescriptions {
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for _, attribute := range mediaSection.Attributes {
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if attribute.Key == "setup" {
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switch attribute.Value {
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case sdp.ConnectionRoleActive.String():
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return DTLSRoleClient
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case sdp.ConnectionRolePassive.String():
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return DTLSRoleServer
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default:
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return DTLSRoleAuto
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}
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}
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}
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}
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return DTLSRoleAuto
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}
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func connectionRoleFromDtlsRole(d DTLSRole) sdp.ConnectionRole {
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switch d {
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case DTLSRoleClient:
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return sdp.ConnectionRoleActive
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case DTLSRoleServer:
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return sdp.ConnectionRolePassive
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case DTLSRoleAuto:
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return sdp.ConnectionRoleActpass
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default:
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return sdp.ConnectionRole(0)
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}
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}
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