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406 lines
14 KiB
406 lines
14 KiB
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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namespace Apewer.Web
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{
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/// <summary>静态站点控制器。</summary>
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public class StaticController : ApiController
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{
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/// <summary>允许服务器端包含(Server Side Include)。</summary>
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/// <remarks>默认值:允许。</remarks>
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protected bool AllowSSI { get; set; } = true;
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/// <summary>当执行目录且没有默认文档时,枚举子目录和子文件。</summary>
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/// <remarks>默认值:不允许。</remarks>
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protected bool AllowEnumerate { get; set; } = false;
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/// <summary>获取已解析的站点根目录。</summary>
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protected string Root { get => _root?.Value; }
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List<string> PathSegments;
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Class<string> _root = null;
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/// <summary></summary>
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public StaticController() : base((c) => { ((StaticController)c).Initialize(); return false; }) { }
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void Initialize()
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{
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if (Request == null || Request.Url == null) return;
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var absolute = Request.Url.AbsolutePath;
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var split = absolute == null ? new string[0] : absolute.Split('/', '\\');
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PathSegments = new List<string>(split.Length);
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foreach (var item in split)
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{
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var trim = TextUtility.Trim(TextUtility.DecodeUrl(item));
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if (string.IsNullOrEmpty(trim)) continue;
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if (trim == "." || trim == "..") continue;
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PathSegments.Add(trim);
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}
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absolute = TextUtility.Join("/", PathSegments);
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var path = MapPath(absolute);
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if (PathSegments.Count < 1) Directory(GetRoot());
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else if (IsBlocked(PathSegments[0])) Respond404(path);
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else if (StorageUtility.FileExists(path)) File(path);
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else if (StorageUtility.DirectoryExists(path)) Directory(path);
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else Respond404(path);
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}
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#region virtual
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/// <summary>响应 404 状态。</summary>
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/// <remarks>默认:设置状态为 404,不输出内容。</remarks>
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protected virtual void Respond404(string path)
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{
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Response.Model = new ApiStatusModel(404);
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}
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/// <summary>响应 403 状态。</summary>
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/// <remarks>默认:设置状态为 403,不输出内容。</remarks>
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protected virtual void Respond403(string path)
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{
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Response.Model = new ApiStatusModel(403);
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}
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/// <summary>获取此静态站点的目录。</summary>
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protected virtual string GetRoot()
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{
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if (_root) return _root.Value;
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var app = RuntimeUtility.ApplicationPath;
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var paths = StorageUtility.GetSubFiles(app);
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foreach (var path in paths)
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{
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var split = path.Split('/', '\\');
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var lower = split[split.Length - 1];
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switch (lower)
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{
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case "index.html":
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case "index.htm":
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case "default.html":
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case "default.htm":
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case "favicon.ico":
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_root = new Class<string>(app);
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return app;
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}
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}
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var www = StorageUtility.CombinePath(app, "www");
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if (System.IO.Directory.Exists(www))
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{
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_root = new Class<string>(www);
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return www;
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}
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var web = StorageUtility.CombinePath(app, "web");
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if (System.IO.Directory.Exists(web))
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{
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_root = new Class<string>(web);
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return web;
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}
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var @static = StorageUtility.CombinePath(app, "static");
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if (System.IO.Directory.Exists(@static))
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{
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_root = new Class<string>(@static);
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return @static;
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}
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_root = new Class<string>(app);
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return app;
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}
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/// <summary>从扩展名获取内容类型。</summary>
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protected virtual string ContentType(string extension) => NetworkUtility.Mime(extension);
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/// <summary>从扩展名和文件路径获取过期时间。</summary>
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/// <remarks>默认值:0,不缓存。</remarks>
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protected virtual int Expires(string extension, string path) => 0;
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/// <summary>已解析到本地文本路径,执行此路径。</summary>
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/// <remarks>默认:输出文件内容,文件不存在时输出 404 状态。</remarks>
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protected virtual void File(string path)
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{
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if (!System.IO.File.Exists(path))
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{
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Respond404(path);
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return;
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}
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// 获取文件扩展名。
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var ext = Path.GetExtension(path).Lower();
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if (ext.Length > 1 && ext.StartsWith(".")) ext = ext.Substring(1);
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// 按扩展名获取缓存过期时间。
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var expires = Expires(ext, path);
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// 按扩展名获取 Content-Type。
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var type = ContentType(ext);
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if (string.IsNullOrEmpty(type)) type = NetworkUtility.Mime(ext);
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// Server Side Includes
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if (AllowSSI && ext == "html" || ext == "htm" || ext == "shtml")
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{
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var html = ReadWithSSI(path);
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var bytes = html.Bytes();
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var model = new ApiBytesModel();
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if (expires > 0) model.Expires = expires;
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model.ContentType = type;
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model.Bytes = bytes;
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Response.Model = model;
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}
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else
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{
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var stream = StorageUtility.OpenFile(path, true);
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var model = new ApiStreamModel();
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if (expires > 0) model.Expires = expires;
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model.ContentType = type;
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model.AutoDispose = true;
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model.Stream = stream;
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Response.Model = model;
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}
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}
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/// <summary>已解析到本地目录路径,执行此路径。</summary>
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/// <remarks>默认:输出文件内容,文件不存在时输出 404 状态。</remarks>
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protected virtual void Directory(string path)
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{
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if (!System.IO.Directory.Exists(path))
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{
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Respond404(path);
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return;
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}
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var @default = Default(path);
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if (!string.IsNullOrEmpty(@default))
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{
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File(@default);
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return;
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}
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if (AllowEnumerate) Response.Data = ListChildren(path);
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else Respond403(path);
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}
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/// <summary>在指定目录下搜索默认文件。</summary>
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/// <returns>完整文件路径,当搜索失败时返回 NULL。</returns>
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protected string Default(string directory)
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{
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var subs = StorageUtility.GetSubFiles(directory);
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if (subs.Count < 0) return null;
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subs.Sort();
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var names = new Dictionary<string, string>(subs.Count);
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foreach (var sub in subs)
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{
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var name = Path.GetFileName(sub);
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if (names.ContainsKey(name)) continue;
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names.Add(name, sub);
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}
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foreach (var sub in subs)
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{
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var name = Path.GetFileName(sub);
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var lower = name.ToLower();
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if (lower == name) continue;
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if (names.ContainsKey(lower)) continue;
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names.Add(lower, sub);
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}
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if (names.ContainsKey("index.html")) return names["index.html"];
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if (names.ContainsKey("index.htm")) return names["index.htm"];
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if (names.ContainsKey("default.html")) return names["default.html"];
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if (names.ContainsKey("default.htm")) return names["default.htm"];
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return null;
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}
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#endregion
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#region private
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// 解析 URL 的路径,获取本地路径。
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string MapPath(string urlPath)
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{
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var path = GetRoot();
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if (!string.IsNullOrEmpty(urlPath))
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{
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foreach (var split in urlPath.Split('/'))
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{
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var seg = split.ToTrim();
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if (string.IsNullOrEmpty(seg)) continue;
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if (seg == "." || seg == "..") continue;
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path = StorageUtility.CombinePath(path, seg);
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}
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}
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return path;
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}
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// Server Side Includes
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string ReadWithSSI(string path, int recursive = 0)
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{
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if (recursive > 10) return "";
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var input = StorageUtility.ReadFile(path, true);
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if (input == null || input.LongLength < 1) return "";
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// 尝试解码。
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var html = TextUtility.FromBytes(input);
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if (string.IsNullOrEmpty(html)) return "";
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// 按首尾截取。
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const string left = "<!--";
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const string right = "-->";
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const string head = "#include virtual=";
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var sb = new StringBuilder();
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var text = html;
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while (true)
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{
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var offset = text.IndexOf(left);
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if (offset < 0)
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{
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sb.Append(text);
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break;
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}
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if (offset > 0)
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{
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sb.Append(text.Substring(0, offset));
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text = text.Substring(offset + left.Length);
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}
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else text = text.Substring(left.Length);
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var length = text.IndexOf(right);
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if (length < 1)
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{
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sb.Append(left);
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sb.Append(text);
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break;
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}
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var inner = text.Substring(0, length);
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var temp = inner.ToTrim();
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if (temp.StartsWith(head))
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{
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temp = temp.Substring(head.Length);
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temp = temp.Replace("\"", "");
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var subPath = MapPath(temp);
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var subText = ReadWithSSI(subPath, recursive + 1);
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if (subText != null && subText.Length > 0) sb.Append(subText);
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}
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else
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{
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sb.Append(left);
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sb.Append(inner);
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sb.Append(right);
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}
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text = text.Substring(length + right.Length);
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}
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var output = sb.ToString();
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return output;
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}
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/// <summary>列出指定目录的子项。</summary>
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Json ListChildren(string directory)
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{
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if (!System.IO.Directory.Exists(directory)) return null;
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var json = Json.NewObject();
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json.SetProperty("directories", ListDirectories(directory));
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json.SetProperty("files", ListFiles(directory));
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return json;
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}
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Json ListDirectories(string directory)
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{
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var array = Json.NewArray();
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var subs = StorageUtility.GetSubDirectories(directory);
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subs.Sort();
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foreach (var sub in subs)
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{
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var split = sub.Split('/', '\\');
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var name = split[split.Length - 1];
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if (IsBlocked(name)) continue;
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var json = Json.NewObject();
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json.SetProperty("name", name);
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try
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{
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var info = new DirectoryInfo(sub);
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json.SetProperty("modified", info.LastWriteTimeUtc.Stamp());
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}
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catch { }
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array.AddItem(json);
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}
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return array;
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}
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Json ListFiles(string directory)
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{
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var array = Json.NewArray();
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var subs = StorageUtility.GetSubFiles(directory);
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subs.Sort();
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foreach (var sub in subs)
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{
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var name = Path.GetFileName(sub);
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if (IsBlocked(name)) continue;
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var json = Json.NewObject();
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json.SetProperty("name", name);
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try
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{
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var info = new FileInfo(sub);
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json.SetProperty("size", info.Length);
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json.SetProperty("modified", info.LastWriteTimeUtc.Stamp());
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}
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catch { }
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array.AddItem(json);
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}
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return array;
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}
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static bool IsBlocked(string segment)
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{
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if (string.IsNullOrEmpty(segment)) return true;
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var lower = segment.ToLower();
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switch (lower)
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{
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case ".":
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case "..":
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// Synology
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case "@eadir":
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case "#recycle":
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// Windows
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case "$recycle.bin":
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case "recycler":
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case "system volume information":
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case "desktop.ini":
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case "thumbs.db":
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// macOS
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case ".ds_store":
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case ".localized":
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// IIS
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case "app_code":
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case "app_data":
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case "aspnet_client":
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case "bin":
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case "web.config":
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return true;
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}
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return false;
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}
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#endregion
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}
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}
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