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