feat(protocol): negotiate registered gateway profiles

gen/go/protocol/protocol.go

@@ -13,7 +13,7 @@ import (
 	"time"
 )
 
-const SchemaSHA256 = "fe4d6be69665f09f04e2cd89273ebc5d2dddf4cde98b94a9d8c4f726504ffe1b"
+const SchemaSHA256 = "3aec8dd72bdbb6b9657c8df3160252c93034c7c1032d471e01eae2ef91e47716"
 const ProtocolVersion = "1.0.0"
 const CurrentWireVersion = "1"
 const NMinus1WireVersion = "0"
@@ -68,12 +68,12 @@ type BrokerSession struct {
 }
 
 type CapabilityProfile struct {
-	Transport         string `json:"transport"`
-	Framing           string `json:"framing"`
-	Media             string `json:"media"`
-	Audio             string `json:"audio"`
-	SourceRateControl string `json:"source_rate_control"`
-	ClientDecode      string `json:"client_decode"`
+	Transport         string   `json:"transport"`
+	Framing           string   `json:"framing"`
+	Media             string   `json:"media"`
+	Audio             string   `json:"audio"`
+	SourceRateControl string   `json:"source_rate_control"`
+	ClientDecode      []string `json:"client_decode"`
 }
 
 type ChannelFrame struct {
@@ -884,14 +884,26 @@ func (v CapabilityProfile) Validate() error {
 	if len(v.SourceRateControl) > 64 {
 		violations = append(violations, FieldViolation{Field: "source_rate_control", Code: "max_length"})
 	}
-	if v.ClientDecode == "" {
+	if v.ClientDecode == nil {
 		violations = append(violations, FieldViolation{Field: "client_decode", Code: "required"})
 	}
-	if len(v.ClientDecode) < 1 && v.ClientDecode != "" {
-		violations = append(violations, FieldViolation{Field: "client_decode", Code: "min_length"})
+	if len(v.ClientDecode) < 1 {
+		violations = append(violations, FieldViolation{Field: "client_decode", Code: "min_items"})
 	}
-	if len(v.ClientDecode) > 64 {
-		violations = append(violations, FieldViolation{Field: "client_decode", Code: "max_length"})
+	if len(v.ClientDecode) > 2 {
+		violations = append(violations, FieldViolation{Field: "client_decode", Code: "max_items"})
+	}
+	for _, item := range v.ClientDecode {
+		if !(item == "h264-opus" || item == "hevc-opus") {
+			violations = append(violations, FieldViolation{Field: "client_decode", Code: "invalid_item"})
+		}
+	}
+	for index, item := range v.ClientDecode {
+		for prior := 0; prior < index; prior++ {
+			if item == v.ClientDecode[prior] {
+				violations = append(violations, FieldViolation{Field: "client_decode", Code: "duplicate_item"})
+			}
+		}
 	}
 	if len(violations) > 0 {
 		return ValidationError{Violations: violations}
@@ -4990,16 +5002,32 @@ func IntersectCapabilityProfiles(profiles ...CapabilityProfile) (CapabilityProfi
 	if err := selected.Validate(); err != nil {
 		return CapabilityProfile{}, ErrNoCapabilityOverlap
 	}
+	common := append([]string(nil), selected.ClientDecode...)
 	for _, profile := range profiles[1:] {
-		if err := profile.Validate(); err != nil || profile != selected {
+		if err := profile.Validate(); err != nil || profile.Transport != selected.Transport || profile.Framing != selected.Framing || profile.Media != selected.Media || profile.Audio != selected.Audio || profile.SourceRateControl != selected.SourceRateControl {
+			return CapabilityProfile{}, ErrNoCapabilityOverlap
+		}
+		next := common[:0]
+		for _, candidate := range common {
+			for _, offered := range profile.ClientDecode {
+				if candidate == offered {
+					next = append(next, candidate)
+					break
+				}
+			}
+		}
+		common = next
+		if len(common) == 0 {
 			return CapabilityProfile{}, ErrNoCapabilityOverlap
 		}
 	}
+	selected.ClientDecode = common
 	return selected, nil
 }
 
 func (v TunnelAdmissionRequest) DeviceAdmissionTranscript() []byte {
-	fields := []string{v.SessionID, v.GatewayID, v.Audience, v.Grant, fmt.Sprintf("%d", v.ReconnectSequence), v.ClientNonce, v.Capabilities.Transport, v.Capabilities.Framing, v.Capabilities.Media, v.Capabilities.Audio, v.Capabilities.SourceRateControl, v.Capabilities.ClientDecode}
+	fields := []string{v.SessionID, v.GatewayID, v.Audience, v.Grant, fmt.Sprintf("%d", v.ReconnectSequence), v.ClientNonce, v.Capabilities.Transport, v.Capabilities.Framing, v.Capabilities.Media, v.Capabilities.Audio, v.Capabilities.SourceRateControl, fmt.Sprintf("%d", len(v.Capabilities.ClientDecode))}
+	fields = append(fields, v.Capabilities.ClientDecode...)
 	var transcript strings.Builder
 	transcript.WriteString("versevdi/tunnel-admission/v1")
 	for _, field := range fields {