fengling-platform/Fengling.Platform.Domain/AggregatesModel/GatewayAggregate/GwTransform.cs

namespace Fengling.Platform.Domain.AggregatesModel.GatewayAggregate;

/// <summary>
/// 请求/响应转换规则（值对象）
/// 以 JSON 列存储在数据库中
/// </summary>
public class GwTransform
{
    /// <summary>
    /// 转换规则键值对
    /// 例如: {"RequestHeader": "X-Custom-Header", "Set": "value"}
    /// </summary>
    public Dictionary<string, string> Rules { get; set; } = new();
}

/// <summary>
/// 常用转换规则工厂
/// </summary>
public static class GwTransforms
{
    /// <summary>
    /// 设置请求头
    /// </summary>
    public static GwTransform SetRequestHeader(string headerName, string value)
        => new() { Rules = new Dictionary<string, string>
        {
            { "RequestHeader", headerName },
            { "Set", value }
        }};

    /// <summary>
    /// 添加请求头
    /// </summary>
    public static GwTransform AppendRequestHeader(string headerName, string value)
        => new() { Rules = new Dictionary<string, string>
        {
            { "RequestHeader", headerName },
            { "Append", value }
        }};

    /// <summary>
    /// 设置响应头
    /// </summary>
    public static GwTransform SetResponseHeader(string headerName, string value)
        => new() { Rules = new Dictionary<string, string>
        {
            { "ResponseHeader", headerName },
            { "Set", value }
        }};

    /// <summary>
    /// 移除路径前缀
    /// </summary>
    public static GwTransform PathRemovePrefix(string prefix)
        => new() { Rules = new Dictionary<string, string>
        {
            { "PathRemovePrefix", prefix }
        }};

    /// <summary>
    /// 设置路径前缀
    /// </summary>
    public static GwTransform PathSetPrefix(string prefix)
        => new() { Rules = new Dictionary<string, string>
        {
            { "PathPrefix", prefix }
        }};

    /// <summary>
    /// 使用原始 Host 头
    /// </summary>
    public static GwTransform RequestHeaderOriginalHost()
        => new() { Rules = new Dictionary<string, string>
        {
            { "RequestHeaderOriginalHost", "true" }
        }};
}