nexus/internal/models/models.go

// Package models defines the core data structures used throughout
// the Nexus Terminal application.
package models

import "time"

// Protocol represents the connection protocol for a session.
type Protocol string

const (
	ProtocolSSH    Protocol = "ssh"
	ProtocolTelnet Protocol = "telnet"
	ProtocolRAW    Protocol = "raw"
)

// HostKeyPolicy determines how unknown or changed SSH host keys are handled.
type HostKeyPolicy string

const (
	HostKeyStrict    HostKeyPolicy = "strict"
	HostKeyAsk       HostKeyPolicy = "ask"
	HostKeyAcceptNew HostKeyPolicy = "accept-new"
	HostKeyInsecure  HostKeyPolicy = "insecure"
)

// SecretMode controls how credentials are persisted.
type SecretMode string

const (
	SecretModeSaved        SecretMode = "saved"
	SecretModeSessionOnly  SecretMode = "session-only"
	SecretModeAskEveryTime SecretMode = "ask-every-time"
)

// LineEnding specifies the line-ending convention for Telnet and RAW connections.
type LineEnding string

const (
	LineEndingLF   LineEnding = "lf"
	LineEndingCR   LineEnding = "cr"
	LineEndingCRLF LineEnding = "crlf"
	LineEndingNone LineEnding = "none"
)

// Profile holds the full configuration for a connection profile.
type Profile struct {
	ID             string     `json:"id"`
	DisplayName    string     `json:"displayName"`
	Description    string     `json:"description"`
	Protocol       Protocol   `json:"protocol"`
	Host           string     `json:"host"`
	Port           int        `json:"port"`
	Username       string     `json:"username"`
	Tags           []string   `json:"tags"`
	Folder         string     `json:"folder"`
	Environment    string     `json:"environment"`
	Notes          string     `json:"notes"`
	Favourite      bool       `json:"favourite"`
	LastConnected  *time.Time `json:"lastConnected"`
	ConnectTimeout int        `json:"connectTimeout"` // seconds
	ReadTimeout    int        `json:"readTimeout"`    // seconds
	CreatedAt      time.Time  `json:"createdAt"`
	UpdatedAt      time.Time  `json:"updatedAt"`

	// Terminal preferences
	TerminalFontFamily  string `json:"terminalFontFamily"`
	TerminalFontSize    int    `json:"terminalFontSize"`
	TerminalScrollback  int    `json:"terminalScrollback"`
	TerminalCursorStyle string `json:"terminalCursorStyle"`

	// SSH-specific configuration
	SSH *SSHConfig `json:"ssh,omitempty"`

	// Telnet-specific configuration
	Telnet *TelnetConfig `json:"telnet,omitempty"`

	// RAW-specific configuration
	RAW *RAWConfig `json:"raw,omitempty"`
}

// SSHConfig holds SSH-specific settings for a connection profile.
type SSHConfig struct {
	AuthMethods       []string          `json:"authMethods"` // password, publickey, keyboard-interactive
	SecretMode        SecretMode        `json:"secretMode"`
	PrivateKeyPath    string            `json:"privateKeyPath"`
	KeySecretMode     SecretMode        `json:"keySecretMode"`
	HostKeyPolicy     HostKeyPolicy     `json:"hostKeyPolicy"`
	TerminalType      string            `json:"terminalType"`
	KeepaliveInterval int               `json:"keepaliveInterval"`
	KeepaliveCountMax int               `json:"keepaliveCountMax"`
	Compression       bool              `json:"compression"`
	JumpHosts         []JumpHost        `json:"jumpHosts"`
	StartupCommand    string            `json:"startupCommand"`
	EnvVars           map[string]string `json:"envVars"`
}

// JumpHost describes a proxy/bastion host used for SSH multi-hop connections.
type JumpHost struct {
	Host           string     `json:"host"`
	Port           int        `json:"port"`
	Username       string     `json:"username"`
	AuthMethod     string     `json:"authMethod"`
	SecretMode     SecretMode `json:"secretMode"`
	PrivateKeyPath string     `json:"privateKeyPath"`
}

// TelnetConfig holds Telnet-specific settings for a connection profile.
type TelnetConfig struct {
	LocalEcho        bool       `json:"localEcho"`
	LineEnding       LineEnding `json:"lineEnding"`
	TerminalType     string     `json:"terminalType"`
	Encoding         string     `json:"encoding"`
	NegotiationDebug bool       `json:"negotiationDebug"`
	LineMode         bool       `json:"lineMode"`
}

// RAWConfig holds RAW TCP-specific settings for a connection profile.
type RAWConfig struct {
	AutoReconnect  bool            `json:"autoReconnect"`
	LineEnding     LineEnding      `json:"lineEnding"`
	Encoding       string          `json:"encoding"`
	ShowTimestamps bool            `json:"showTimestamps"`
	ShowDirection  bool            `json:"showDirection"`
	PayloadPresets []PayloadPreset `json:"payloadPresets"`
}

// PayloadPreset stores a reusable payload for RAW TCP connections.
type PayloadPreset struct {
	ID      string `json:"id"`
	Name    string `json:"name"`
	Payload string `json:"payload"` // base64-encoded for binary safety
	Format  string `json:"format"`  // text, hex, escaped
}

// SessionState represents the lifecycle state of a connection session.
type SessionState string

const (
	SessionConnecting   SessionState = "connecting"
	SessionConnected    SessionState = "connected"
	SessionDisconnected SessionState = "disconnected"
	SessionError        SessionState = "error"
)

// SessionInfo provides metadata about an active or recent session.
type SessionInfo struct {
	ID          string       `json:"id"`
	ProfileID   string       `json:"profileId"`
	ProfileName string       `json:"profileName"`
	Protocol    Protocol     `json:"protocol"`
	Host        string       `json:"host"`
	Port        int          `json:"port"`
	State       SessionState `json:"state"`
	TabName     string       `json:"tabName"`
	Pinned      bool         `json:"pinned"`
	ConnectedAt time.Time    `json:"connectedAt"`
	Error       string       `json:"error,omitempty"`
}

// KnownHost records a previously-seen SSH host key fingerprint.
type KnownHost struct {
	ID          string    `json:"id"`
	Host        string    `json:"host"`
	Port        int       `json:"port"`
	KeyType     string    `json:"keyType"`
	Fingerprint string    `json:"fingerprint"`
	PublicKey   string    `json:"publicKey"`
	FirstSeen   time.Time `json:"firstSeen"`
	LastSeen    time.Time `json:"lastSeen"`
	Trusted     bool      `json:"trusted"`
}

// AppPreferences stores user-level application settings.
type AppPreferences struct {
	Theme               string `json:"theme"`
	DefaultProtocol     string `json:"defaultProtocol"`
	ConfirmOnClose      bool   `json:"confirmOnClose"`
	ConfirmOnDisconnect bool   `json:"confirmOnDisconnect"`
	ShowStatusBar       bool   `json:"showStatusBar"`
	SidebarWidth        int    `json:"sidebarWidth"`
	DefaultFontFamily   string `json:"defaultFontFamily"`
	DefaultFontSize     int    `json:"defaultFontSize"`
	DefaultScrollback   int    `json:"defaultScrollback"`
	DefaultCursorStyle  string `json:"defaultCursorStyle"`
}

// AuditEntry records an auditable action within the application.
type AuditEntry struct {
	ID        string    `json:"id"`
	Timestamp time.Time `json:"timestamp"`
	Action    string    `json:"action"`
	ProfileID string    `json:"profileId,omitempty"`
	SessionID string    `json:"sessionId,omitempty"`
	Details   string    `json:"details"`
}