Add modular capture backends, resolution profiles, Wayland support

pkg/engine/capture/backends/vnc.go

@@ -0,0 +1,221 @@
+// VNC client capture for remote desktop access.
+package backends
+
+import (
+	"fmt"
+	"image"
+	"net"
+	"time"
+
+	"git.cloonar.com/openclawd/iso-bot/pkg/engine/capture"
+)
+
+// VNCConfig holds configuration for VNC client capture.
+type VNCConfig struct {
+	// Host is the VNC server hostname or IP address.
+	Host string `yaml:"host"`
+
+	// Port is the VNC server port (default 5900).
+	Port int `yaml:"port"`
+
+	// Password for VNC authentication.
+	Password string `yaml:"password"`
+
+	// Shared allows multiple VNC clients to connect simultaneously.
+	Shared bool `yaml:"shared"`
+
+	// Encodings specifies preferred pixel encodings (e.g., "raw", "copyrect", "hextile").
+	Encodings []string `yaml:"encodings"`
+
+	// ConnectTimeout is the timeout for initial connection.
+	ConnectTimeoutMs int `yaml:"connect_timeout_ms"`
+
+	// ReadTimeout is the timeout for frame updates.
+	ReadTimeoutMs int `yaml:"read_timeout_ms"`
+}
+
+// VNCSource captures frames from a VNC server.
+type VNCSource struct {
+	config     VNCConfig
+	conn       net.Conn
+	width      int
+	height     int
+	pixelFormat VNCPixelFormat
+	connected  bool
+}
+
+// VNCPixelFormat describes the pixel format used by the VNC server.
+type VNCPixelFormat struct {
+	BitsPerPixel  uint8
+	Depth         uint8
+	BigEndian     bool
+	TrueColor     bool
+	RedMax        uint16
+	GreenMax      uint16
+	BlueMax       uint16
+	RedShift      uint8
+	GreenShift    uint8
+	BlueShift     uint8
+}
+
+// NewVNCSource creates a VNC client capture source.
+func NewVNCSource(configMap map[string]interface{}) (capture.Source, error) {
+	var config VNCConfig
+
+	// Extract config from map
+	if host, ok := configMap["host"].(string); ok {
+		config.Host = host
+	} else {
+		return nil, fmt.Errorf("vnc host is required")
+	}
+
+	if port, ok := configMap["port"].(int); ok {
+		config.Port = port
+	} else {
+		config.Port = 5900 // Default VNC port
+	}
+
+	if password, ok := configMap["password"].(string); ok {
+		config.Password = password
+	}
+
+	if shared, ok := configMap["shared"].(bool); ok {
+		config.Shared = shared
+	} else {
+		config.Shared = true // Default to shared access
+	}
+
+	if encodings, ok := configMap["encodings"].([]string); ok {
+		config.Encodings = encodings
+	} else {
+		config.Encodings = []string{"raw", "copyrect", "hextile", "rre"} // Default encodings
+	}
+
+	if connectTimeout, ok := configMap["connect_timeout_ms"].(int); ok {
+		config.ConnectTimeoutMs = connectTimeout
+	} else {
+		config.ConnectTimeoutMs = 10000 // 10 seconds
+	}
+
+	if readTimeout, ok := configMap["read_timeout_ms"].(int); ok {
+		config.ReadTimeoutMs = readTimeout
+	} else {
+		config.ReadTimeoutMs = 5000 // 5 seconds
+	}
+
+	return &VNCSource{
+		config: config,
+	}, nil
+}
+
+// Name returns a description of this capture source.
+func (v *VNCSource) Name() string {
+	return fmt.Sprintf("VNC: %s:%d", v.config.Host, v.config.Port)
+}
+
+// Capture grabs a single frame from the VNC server.
+func (v *VNCSource) Capture() (image.Image, error) {
+	if !v.connected {
+		if err := v.connect(); err != nil {
+			return nil, fmt.Errorf("failed to connect to VNC server: %w", err)
+		}
+	}
+
+	// TODO: Implement VNC frame capture
+	// 1. Send FramebufferUpdateRequest message
+	// 2. Read FramebufferUpdate response
+	// 3. Process rectangles with different encodings (Raw, RRE, CoRRE, Hextile, etc.)
+	// 4. Update local framebuffer
+	// 5. Convert framebuffer to Go image.Image
+	return nil, fmt.Errorf("VNC capture not implemented yet")
+}
+
+// CaptureRegion grabs a sub-region of the VNC framebuffer.
+func (v *VNCSource) CaptureRegion(r capture.Region) (image.Image, error) {
+	// TODO: Implement region capture
+	// Send FramebufferUpdateRequest for specific region
+	return nil, fmt.Errorf("VNC region capture not implemented yet")
+}
+
+// Size returns the VNC framebuffer dimensions.
+func (v *VNCSource) Size() (width, height int) {
+	return v.width, v.height
+}
+
+// Close disconnects from the VNC server.
+func (v *VNCSource) Close() error {
+	v.connected = false
+	if v.conn != nil {
+		return v.conn.Close()
+	}
+	return nil
+}
+
+// connect establishes a connection to the VNC server and performs handshake.
+func (v *VNCSource) connect() error {
+	// TODO: Implement VNC connection and handshake
+	// 1. Connect to host:port
+	// 2. Read protocol version
+	// 3. Perform authentication (if required)
+	// 4. Send ClientInit message
+	// 5. Read ServerInit (framebuffer size, pixel format, etc.)
+	// 6. Set pixel format and encodings
+	
+	addr := fmt.Sprintf("%s:%d", v.config.Host, v.config.Port)
+	conn, err := net.DialTimeout("tcp", addr, time.Duration(v.config.ConnectTimeoutMs)*time.Millisecond)
+	if err != nil {
+		return fmt.Errorf("failed to connect to %s: %w", addr, err)
+	}
+
+	v.conn = conn
+	v.connected = true
+
+	return fmt.Errorf("VNC handshake not implemented")
+}
+
+// performHandshake handles VNC protocol negotiation.
+func (v *VNCSource) performHandshake() error {
+	// TODO: Implement VNC handshake
+	// 1. Protocol version negotiation
+	// 2. Security type negotiation
+	// 3. Authentication (VNC, None, etc.)
+	// 4. ClientInit/ServerInit exchange
+	return fmt.Errorf("VNC handshake not implemented")
+}
+
+// readFramebufferUpdate reads and processes a framebuffer update.
+func (v *VNCSource) readFramebufferUpdate() error {
+	// TODO: Implement framebuffer update processing
+	// 1. Read FramebufferUpdate message header
+	// 2. Process each rectangle based on encoding type
+	// 3. Update local framebuffer bitmap
+	return fmt.Errorf("VNC framebuffer update not implemented")
+}
+
+// requestFramebufferUpdate sends a request for screen updates.
+func (v *VNCSource) requestFramebufferUpdate(x, y, width, height int, incremental bool) error {
+	// TODO: Send FramebufferUpdateRequest message
+	// Message format:
+	// - Type: 3 (FramebufferUpdateRequest)
+	// - Incremental: 0/1
+	// - X, Y, Width, Height: region to update
+	return fmt.Errorf("VNC framebuffer request not implemented")
+}
+
+// decodeRawEncoding processes Raw encoding (uncompressed pixel data).
+func (v *VNCSource) decodeRawEncoding(x, y, width, height int) error {
+	// TODO: Read raw pixel data and update framebuffer
+	return fmt.Errorf("VNC Raw encoding not implemented")
+}
+
+// decodeRREEncoding processes RRE (Rise-and-Run-length Encoding).
+func (v *VNCSource) decodeRREEncoding(x, y, width, height int) error {
+	// TODO: Decode RRE compressed data
+	return fmt.Errorf("VNC RRE encoding not implemented")
+}
+
+// decodeHextileEncoding processes Hextile encoding.
+func (v *VNCSource) decodeHextileEncoding(x, y, width, height int) error {
+	// TODO: Decode Hextile compressed data
+	return fmt.Errorf("VNC Hextile encoding not implemented")
+}