Add full monorepo: virtual-banker, backend, frontend, docs, scripts, deployment

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/logging/logger.go

@@ -0,0 +1,107 @@
+package logging
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"os"
+	"time"
+)
+
+// Logger provides structured logging
+type Logger struct {
+	level  string
+	fields map[string]interface{}
+}
+
+// NewLogger creates a new logger
+func NewLogger(level string) *Logger {
+	return &Logger{
+		level:  level,
+		fields: make(map[string]interface{}),
+	}
+}
+
+// WithField adds a field to the logger
+func (l *Logger) WithField(key string, value interface{}) *Logger {
+	newLogger := &Logger{
+		level:  l.level,
+		fields: make(map[string]interface{}),
+	}
+	for k, v := range l.fields {
+		newLogger.fields[k] = v
+	}
+	newLogger.fields[key] = value
+	return newLogger
+}
+
+// Info logs an info message
+func (l *Logger) Info(ctx context.Context, message string) {
+	l.log(ctx, "info", message, nil)
+}
+
+// Error logs an error message
+func (l *Logger) Error(ctx context.Context, message string, err error) {
+	l.log(ctx, "error", message, map[string]interface{}{
+		"error": err.Error(),
+	})
+}
+
+// Warn logs a warning message
+func (l *Logger) Warn(ctx context.Context, message string) {
+	l.log(ctx, "warn", message, nil)
+}
+
+// Debug logs a debug message
+func (l *Logger) Debug(ctx context.Context, message string) {
+	l.log(ctx, "debug", message, nil)
+}
+
+// log logs a message with structured fields
+func (l *Logger) log(ctx context.Context, level, message string, extraFields map[string]interface{}) {
+	entry := map[string]interface{}{
+		"timestamp": time.Now().UTC().Format(time.RFC3339),
+		"level":     level,
+		"message":   message,
+	}
+
+	// Add logger fields
+	for k, v := range l.fields {
+		entry[k] = v
+	}
+
+	// Add extra fields
+	if extraFields != nil {
+		for k, v := range extraFields {
+			entry[k] = v
+		}
+	}
+
+	// Sanitize PII
+	entry = sanitizePII(entry)
+
+	// Output as JSON
+	jsonBytes, err := json.Marshal(entry)
+	if err != nil {
+		log.Printf("Failed to marshal log entry: %v", err)
+		return
+	}
+
+	fmt.Fprintln(os.Stdout, string(jsonBytes))
+}
+
+// sanitizePII removes or masks PII from log entries
+func sanitizePII(entry map[string]interface{}) map[string]interface{} {
+	sanitized := make(map[string]interface{})
+	for k, v := range entry {
+		// Mask sensitive fields
+		if k == "password" || k == "api_key" || k == "token" {
+			sanitized[k] = "***REDACTED***"
+		} else {
+			sanitized[k] = v
+		}
+	}
+	return sanitized
+}
+