chore: capture post-P0/P1 state for clean P2 start (working tree was dirty at task begin)

config/config.go

@@ -2,8 +2,11 @@ package config
 
 import (
 	"fmt"
+	"net"
 	"os"
+	"strings"
 
+	"github.com/docker/go-units"
 	"gopkg.in/yaml.v3"
 )
 
@@ -15,6 +18,10 @@ type Config struct {
 	MaxConcurrentRequests int64 `yaml:"max_concurrent_requests" default:"200"`
 	MaxRequestsPerClient  int64 `yaml:"max_requests_per_client" default:"5"`
 
+	// P1 hardening limits (security/correctness)
+	MaxObjectSize  string   `yaml:"max_object_size" default:"0"` // 0=unlimited; e.g. "256MB" protects against OOM from huge/malicious upstream responses (P1-01)
+	TrustedProxies []string `yaml:"trusted_proxies"`             // CIDR list; empty=never trust X-Forwarded-For (safe default, P1-02). See README security notes.
+
 	// Cache configuration
 	Cache CacheConfig `yaml:"cache"`
 
@@ -75,6 +82,12 @@ func LoadConfig(configPath string) (*Config, error) {
 	if config.MaxRequestsPerClient == 0 {
 		config.MaxRequestsPerClient = 3
 	}
+	if config.MaxObjectSize == "" {
+		config.MaxObjectSize = "0"
+	}
+	if config.TrustedProxies == nil {
+		config.TrustedProxies = []string{}
+	}
 	if config.Cache.Memory.Size == "" {
 		config.Cache.Memory.Size = "0"
 	}
@@ -99,8 +112,10 @@ func SaveDefaultConfig(configPath string) error {
 
 	defaultConfig := Config{
 		ListenAddress:         ":80",
-		MaxConcurrentRequests: 50, // Reduced for home user (less concurrent load)
-		MaxRequestsPerClient:  3,  // Reduced for home user (more conservative per client)
+		MaxConcurrentRequests: 50,         // Reduced for home user (less concurrent load)
+		MaxRequestsPerClient:  3,          // Reduced for home user (more conservative per client)
+		MaxObjectSize:         "0",        // 0=unlimited; set e.g. "512MB" for DoS protection on large bodies (P1-01)
+		TrustedProxies:        []string{}, // Conservative default: never trust XFF (P1-02 spoof prevention)
 		Cache: CacheConfig{
 			Memory: MemoryConfig{
 				Size:        "1GB", // Recommended for systems that can spare 1GB RAM for caching
@@ -133,6 +148,8 @@ func GetDefaultConfig() Config {
 		ListenAddress:         ":80",
 		MaxConcurrentRequests: 50,
 		MaxRequestsPerClient:  3,
+		MaxObjectSize:         "0",        // 0=unlimited (override for bounded response safety)
+		TrustedProxies:        []string{}, // safe default: do not trust forwarded headers
 		Cache: CacheConfig{
 			Memory: MemoryConfig{
 				Size:        "1GB",
@@ -169,5 +186,30 @@ func (c Config) Validate() error {
 		return fmt.Errorf("disk cache enabled but no path specified")
 	}
 
+	// P1 light validation for security/resource fields (mirrors existing GC + path checks; fails fast before New)
+	if c.MaxObjectSize != "" && c.MaxObjectSize != "0" {
+		if _, err := units.FromHumanSize(c.MaxObjectSize); err != nil {
+			return fmt.Errorf("invalid max_object_size: %w", err)
+		}
+	}
+	for _, p := range c.TrustedProxies {
+		p = strings.TrimSpace(p)
+		if p == "" {
+			continue
+		}
+		if !strings.Contains(p, "/") {
+			if net.ParseIP(p) == nil {
+				return fmt.Errorf("invalid trusted_proxies entry (not IP or CIDR): %s", p)
+			}
+			continue
+		}
+		if _, _, err := net.ParseCIDR(p); err != nil {
+			return fmt.Errorf("invalid trusted_proxies CIDR: %s", p)
+		}
+	}
+	if c.MaxConcurrentRequests < 0 || c.MaxRequestsPerClient < 0 { // already covered above but explicit for P1 knobs
+		// covered by earlier checks
+	}
+
 	return nil
 }