Initial commit

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/service/activityclient/sign.go

@@ -0,0 +1,37 @@
+package activityclient
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+
+	"91porn-server/common/crypt"
+)
+
+// SignPayload 签名载荷（与 activity-public-server 保持一致）
+type SignPayload struct {
+	AppId          string `json:"appId"`          // 应用ID
+	UserId         string `json:"userId"`         // 用户ID
+	Nickname       string `json:"nickname"`       // 用户昵称
+	Avatar         string `json:"avatar"`         // 用户头像
+	Ts             int64  `json:"ts"`             // 时间戳（秒）
+	RegisteredAt   int64  `json:"registeredAt"`   // 用户注册时间（Unix秒）
+	RechargeAmount int    `json:"rechargeAmount"` // 充值金额（分）
+}
+
+// EncryptSign AES-CBC 加密签名载荷，返回 Base64 URL Safe 编码
+func EncryptSign(secretKeyBase64 string, payload *SignPayload) (string, error) {
+	secretKey, err := base64.StdEncoding.DecodeString(secretKeyBase64)
+	if err != nil {
+		return "", fmt.Errorf("decode secretKey failed: %w", err)
+	}
+	plaintext, err := json.Marshal(payload)
+	if err != nil {
+		return "", fmt.Errorf("marshal payload failed: %w", err)
+	}
+	ciphertext, err := crypt.AESCBCPck5Encrypt(plaintext, secretKey)
+	if err != nil {
+		return "", fmt.Errorf("encrypt failed: %w", err)
+	}
+	return base64.URLEncoding.EncodeToString(ciphertext), nil
+}