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59 lines
2.0 KiB
59 lines
2.0 KiB
2 months ago
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package directstream
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import (
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"errors"
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"fmt"
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"net"
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"strings"
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"time"
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)
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const (
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SessionEventConnected = "connected"
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SessionEventDisconnected = "disconnected"
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)
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// SessionEvent is emitted by tera-sessiond only after a ticket-bound Direct
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// Mode attachment has been authenticated. Source is the normalized client IP
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// supplied by the trusted same-origin gateway.
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type SessionEvent struct {
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Type string `json:"type"`
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Source string `json:"source"`
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Timestamp time.Time `json:"timestamp"`
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}
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func validateSessionEvent(event SessionEvent) error {
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if event.Type != SessionEventConnected && event.Type != SessionEventDisconnected {
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return errors.New("direct stream session event type is invalid")
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}
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if net.ParseIP(strings.TrimSpace(event.Source)) == nil {
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return errors.New("direct stream session event source must be an IP address")
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}
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if event.Timestamp.IsZero() {
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return errors.New("direct stream session event timestamp is required")
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}
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return nil
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}
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// SessionEventMessage is shared by the WebSocket welcome frame and the
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// authoritative per-port log writer so the operator sees the same identity
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// data that is retained for the channel.
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func SessionEventMessage(claims TicketClaims, event SessionEvent) string {
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timestamp := event.Timestamp.UTC().Format(time.RFC3339)
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if event.Type == SessionEventConnected {
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return fmt.Sprintf(
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"Welcome to TERA CORA-X48 PRO K\nConnected from: %s\nSerial channel: %s\nUser: %s\nAccess: %s\nSession: %s\nConnected at: %s",
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event.Source, claims.Channel, claims.Actor, claims.Access, claims.SessionID, timestamp,
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)
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}
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return fmt.Sprintf(
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"TERA CORA-X48 PRO K session disconnected\nConnected from: %s\nSerial channel: %s\nUser: %s\nAccess: %s\nSession: %s\nDisconnected at: %s",
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event.Source, claims.Channel, claims.Actor, claims.Access, claims.SessionID, timestamp,
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)
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}
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func welcomeFrame(claims TicketClaims, event SessionEvent) []byte {
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message := strings.ReplaceAll(SessionEventMessage(claims, event), "\n", "\r\n")
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return []byte("\r\n" + message + "\r\n\r\n")
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}
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