using ThingsGateway.NewLife.Remoting;

namespace ThingsGateway.NewLife.Http;

/// <summary>静态文件处理器</summary>
public class StaticFilesHandler : IHttpHandler
{
    #region 属性
    /// <summary>映射路径</summary>
    public String Path { get; set; } = null!;

    /// <summary>内容目录</summary>
    public String ContentPath { get; set; } = null!;
    #endregion

    /// <summary>处理请求</summary>
    /// <param name="context"></param>
    public virtual void ProcessRequest(IHttpContext context)
    {
        if (!context.Path.StartsWithIgnoreCase(Path)) throw new ApiException(ApiCode.NotFound, $"File {context.Path} not found");

        var file = context.Path[Path.Length..];
        file = ContentPath.CombinePath(file);

        // 路径安全检查，防止越界
        if (!file.GetFullPath().StartsWithIgnoreCase(ContentPath.GetFullPath()))
            throw new ApiException(ApiCode.NotFound, $"File {context.Path} not found");

        var fi = file.AsFile();
        if (!fi.Exists) throw new ApiException(ApiCode.NotFound, $"File {context.Path} not found");

        var contentType = fi.Extension switch
        {
            ".htm" => "text/html",
            ".html" => "text/html",
            ".txt" => "text/plain",
            ".log" => "text/plain",
            ".xml" => "text/xml",
            ".json" => "text/json",
            ".js" => "text/javascript",
            ".css" => "text/css",
            ".png" => "image/png",
            ".jpg" => "image/jpg",
            ".gif" => "image/gif",
            _ => null,
        };

        // 确保使用完以后关闭文件流
        using var fs = fi.OpenRead();
        context.Response.SetResult(fs, contentType);
    }
}