feat: Prism HTTP/SOCKS5 代理网关及管理台

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

internal/auth/apikey.go

@@ -0,0 +1,51 @@
+package auth
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"strings"
+)
+
+const APIKeyPrefix = "prism_"
+
+func GenerateAPIKey() (string, error) {
+	var b [16]byte
+	if _, err := rand.Read(b[:]); err != nil {
+		return "", err
+	}
+	return APIKeyPrefix + hex.EncodeToString(b[:]), nil
+}
+
+func HashAPIKey(key string) string {
+	sum := sha256.Sum256([]byte(key))
+	return hex.EncodeToString(sum[:])
+}
+
+func APIKeyDisplayPrefix(key string) string {
+	key = strings.TrimSpace(key)
+	if len(key) <= 12 {
+		return key
+	}
+	return key[:12] + "…"
+}
+
+func IsAPIKeyFormat(key string) bool {
+	return strings.HasPrefix(strings.TrimSpace(key), APIKeyPrefix)
+}
+
+func ValidateAPIKeyFormat(key string) error {
+	key = strings.TrimSpace(key)
+	if !strings.HasPrefix(key, APIKeyPrefix) {
+		return fmt.Errorf("invalid api key format")
+	}
+	raw := strings.TrimPrefix(key, APIKeyPrefix)
+	if len(raw) != 32 {
+		return fmt.Errorf("invalid api key length")
+	}
+	if _, err := hex.DecodeString(raw); err != nil {
+		return fmt.Errorf("invalid api key encoding")
+	}
+	return nil
+}