src/Library/NetPro.Web.Api/Helper/WebHelper.cs

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using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.AspNetCore.StaticFiles;
using Microsoft.Extensions.Primitives;
using Microsoft.Net.Http.Headers;
using NetPro.Web.Api;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;

namespace System.NetPro
{
    /// <summary>
    /// Represents a web helper
    /// </summary>
    public partial class WebHelper : IWebHelper
    {
        #region Const

        private const string NullIpAddress = "::1";

        #endregion

        #region Fields 

        private readonly IHttpContextAccessor _httpContextAccessor;
        private readonly HostingConfig _hostingConfig;
        private readonly INetProFileProvider _fileProvider;

        #endregion

        #region Ctor

        /// <summary>
        /// Ctor
        /// </summary>
        /// <param name="hostingConfig">Hosting config</param>
        /// <param name="httpContextAccessor">HTTP context accessor</param>
        /// <param name="fileProvider">File provider</param>
        public WebHelper(HostingConfig hostingConfig, IHttpContextAccessor httpContextAccessor,
            INetProFileProvider fileProvider)
        {
            this._hostingConfig = hostingConfig;
            this._httpContextAccessor = httpContextAccessor;
            this._fileProvider = fileProvider;
        }

        #endregion

        #region Utilities

        /// <summary>
        /// Check whether current HTTP request is available
        /// </summary>
        /// <returns>True if available; otherwise false</returns>
        protected virtual bool IsRequestAvailable()
        {
            if (_httpContextAccessor == null || _httpContextAccessor.HttpContext == null)