You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

310 lines
11 KiB

using Apewer.Network;
using Apewer.Source;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using static Apewer.Internals.ApiHelper;
namespace Apewer.Web
{
internal class ApiProcessor
{
internal ApiInvoker Invoker;
internal ApiEntries Entries;
internal ApiProvider Provider;
ApiOptions Options;
Stopwatch Stopwatch;
Uri Url;
HttpMethod Method;
ApiRequest ApiRequest;
ApiResponse ApiResponse;
internal ApiProcessor()
{
}
/// <summary>执行处理程序,返回错误信息。</summary>
public string Run()
{
if (Options == null) Options = new ApiOptions();
if (Options.WithDuration)
{
Stopwatch = new Stopwatch();
Stopwatch.Start();
}
var error = Flow();
if (Stopwatch != null)
{
Stopwatch.Stop();
Stopwatch = null;
}
return error;
}
string Flow()
{
try
{
// 传入字段。
if (Provider == null) return "服务程序无效。";
if (Invoker == null) return "调用器无效。";
if (Entries == null) return "入口无效。";
Options = Invoker.Options ?? new ApiOptions();
Provider.Options = Options;
// 检查执行的前提条件,获取 Method 和 URL。
var check = Check();
if (!string.IsNullOrEmpty(check)) return check;
// 准备请求和响应模型。
ApiRequest = GetRequest(Provider, Options, Method, Url);
ApiResponse = new ApiResponse();
ApiResponse.Random = ApiRequest.Random;
ApiResponse.Application = ApiRequest.Application;
ApiResponse.Function = ApiRequest.Function;
// 调用 API。
var invoke = Invoke();
if (!string.IsNullOrEmpty(invoke)) return invoke;
// 输出。
if (Stopwatch != null)
{
Stopwatch.Stop();
ApiResponse.Duration = Stopwatch.ElapsedMilliseconds;
Stopwatch = null;
}
Output(Provider, Options, ApiResponse, ApiRequest, Method);
return null;
}
catch (Exception ex)
{
if (Stopwatch != null)
{
Stopwatch.Stop();
Stopwatch = null;
}
return ex.Message;
}
}
string Check()
{
// 服务程序检查。
var check = Provider.PreInvoke();
if (!string.IsNullOrEmpty(check)) return check;
// URL
Url = Provider.GetUrl();
if (Url == null) return "URL 无效。";
Method = Provider.GetMethod();
if (Method == HttpMethod.NULL) return "HTTP 方法无效。";
if (Method == HttpMethod.OPTIONS) return null;
// favicon.ico
var lowerPath = TextUtility.AssureStarts(TextUtility.Lower(Url.AbsolutePath), "/");
if (!Options.AllowFavIcon)
{
if (lowerPath.StartsWith("/favicon.ico"))
{
Output(Provider, Options, null, null);
return "已取消对 favicon.ico 的请求。";
}
}
// robots.txt
if (!Options.AllowRobots)
{
if (lowerPath.StartsWith("/robots.txt"))
{
const string text = "User-agent: *\nDisallow: / \n";
Output(Provider, Options, "text/plain", TextUtility.Bytes(text));
return "已取消对 robots.txt 的请求。";
}
}
return null;
}
// 寻找入口。
string Invoke()
{
var appName = ApiRequest.Application;
var funcName = ApiRequest.Function;
var random = ApiRequest.Random;
Invoke(Entries.Get(appName));
if (Stopwatch != null) ApiResponse.Duration = Stopwatch.ElapsedMilliseconds;
ApiResponse.Application = appName;
ApiResponse.Function = funcName;
ApiResponse.Random = random;
return null;
}
// 创建控制器。
void Invoke(ApiApplication application)
{
var request = ApiRequest;
var response = ApiResponse;
var function = null as ApiFunction;
var controller = null as ApiController;
// Application 无效,尝试默认控制器和枚举。
if (application == null)
{
var @default = Options.Default;
if (@default == null)
{
// 没有指定默认控制器,尝试枚举。
response.Error("Invalid Application");
if (Options.AllowEnumerate) response.Data = Enumerate(Entries.Enumerate(), Options);
return;
}
else
{
// 创建默认控制器。
try { controller = CreateController(@default, request, response, Options); }
catch (Exception ex) { ApiUtility.Exception(response, ex.InnerException); }
}
}
else
{
// 创建控制器时候会填充 Controller.Request 属性,可能导致 Request.Function 被篡改,所以在创建之前获取 Function。
function = application.Get(request.Function);
try { controller = CreateController(application.Type, request, response, Options); }
catch (Exception ex) { ApiUtility.Exception(response, ex.InnerException); }
}
if (controller == null) response.Error("创建控制器实例失败。");
else Invoke(controller, application, function, Options, request, response);
RuntimeUtility.Dispose(controller);
}
// 调用 Function。
static void Invoke(ApiController controller, ApiApplication application, ApiFunction function, ApiOptions options, ApiRequest request, ApiResponse response)
{
// 没有 ApiApplication,使用了 Options 中指定的默认控制器。
if (application == null)
{
application = new ApiApplication();
application.Independent = true;
application.Hidden = true;
}
try
{
// 控制器初始化。
var initializer = ApiUtility.GetInitialier(controller);
var match = initializer == null ? true : initializer.Invoke(controller);
if (!match) return;
if (application.Independent) return;
if (function != null)
{
var result = function.Method.Invoke(controller, ReadParameters(request, function));
if (result == null || function.Returnable == null) return;
var returnable = function.Returnable;
// 已明确字符串类型,视为提示错误。
if (returnable.Equals(typeof(string)))
{
var error = result as string;
if (!string.IsNullOrEmpty(error)) response.Error(error);
return;
}
// 已明确 Exception 类型,视为提示错误。
if (result is Exception)
{
ApiUtility.Exception(response, result as Exception);
return;
}
// 已明确 Json 类型。
if (result is Json)
{
response.Data = result as Json;
return;
}
// 已明确 Model 类型。
if (result is ApiModel)
{
response.Model = result as ApiModel;
return;
}
// 类型未知,尝试 ToJson 方法。
var tojson = result as IToJson;
if (tojson != null)
{
response.Data = tojson.ToJson();
return;
}
// 类型未知,尝试 Record 模型。
var record = result as IRecord;
if (record != null)
{
response.Data = Json.From(record);
return;
}
// 未知类型,尝试 Json 类型。
var json = result as Json;
if (json != null)
{
response.Data = json;
return;
}
// 未知返回类型,无法明确输出格式,忽略。
}
else
{
// 未匹配到 Function,尝试 Default。
var @default = ApiUtility.GetDefault(controller);
if (@default != null)
{
@default.Invoke(controller);
return;
}
// 没有执行任何 Function,尝试枚举。
if (application.Hidden)
{
response.Error("Invalid Application");
}
else
{
response.Error("Invalid Function");
if (options.AllowEnumerate) response.Data = Enumerate(application.Items, options);
}
}
}
catch (Exception exception)
{
if (exception == null) response.Error("发生了未定义的异常。");
else ApiUtility.Exception(response, exception);
}
}
static ApiController CreateController(Type type, ApiRequest request, ApiResponse response, ApiOptions options)
{
var controller = (ApiController)Activator.CreateInstance(type);
ApiUtility.SetProperties(controller, request, response, options);
return controller;
}
}
}