public async Task <HttpResponseMessage> Get(Guid fileId, [FromServices] GetFileHandler fh)
{
HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
var(stream, file) = await fh.Get(fileId);
result.Content = new StreamContent(stream);
result.Content.Headers.ContentType = new MediaTypeHeaderValue(file.ContentType);
result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = file.FileName
};
return(result);
}
public static IApplicationBuilder MapGetFile(this IApplicationBuilder app,
IFileserverConfig <HttpRequest> config)
{
app.MapWhen(c => HttpMethod.Get.Method.Equals(c.Request.Method, StringComparison.OrdinalIgnoreCase),
builder =>
{
builder.Run(async context =>
{
var handler = new GetFileHandler(
builder.ApplicationServices.GetService(typeof(ILoggerFactory)) as ILoggerFactory,
config.GetFilePipeline());
await handler.Invoke(context);
});
});
return(app);
}
/// <summary>
/// 文件处理模块
/// </summary>
/// <param name="context"></param>
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
context.Response.AddHeader("Pragma", "no-cache");
context.Response.AddHeader("Cache-Control", "private, no-cache");
context.Response.Charset = "utf-8";
context.Response.ContentEncoding = Encoding.GetEncoding("utf-8");
Handler action = null;
var fun = context.GetStringFromParameters("fun");
switch (fun)
{
case "001":
action = new UploadHandler(context, new UploadConfig
{
AllowExtensions = Config.GetStringList("imageAllowFiles"),
PathFormat = Config.GetString("imagePathFormat"),
SizeLimit = Config.GetInt("imageMaxSize"),
UploadFieldName = Config.GetString("imageFieldName"),
PreUrl = Config.GetString("imageUrlPrefix"),
Others = context.GetStringFromParameters("others")
});
break;
//获取文件记录
case "002":
action = new GetFileHandler(context);
break;
//接收文件
case "003":
action = new UploadPartHandler(context, new UploadConfig
{
AllowExtensions = Config.GetStringList("imageAllowFiles"),
PathFormat = Config.GetString("imagePathFormat"),
SizeLimit = Config.GetInt("imageMaxSize"),
UploadFieldName = Config.GetString("imageFieldName"),
PreUrl = Config.GetString("imageUrlPrefix")
});
break;
//通知文件传输结束
case "004":
action = new FinishuploadHandler(context, new UploadConfig
{
AllowExtensions = Config.GetStringList("imageAllowFiles"),
PathFormat = Config.GetString("imagePathFormat"),
SizeLimit = Config.GetInt("imageMaxSize"),
UploadFieldName = Config.GetString("imageFieldName"),
PreUrl = Config.GetString("imageUrlPrefix")
});
break;
//测试通信
default:
var result = new UploadResult {
State = UploadState.Success, Url = "测试通信"
};
var returnValue = JsonConvert.SerializeObject(result);
context.Response.Write(returnValue);
context.Response.End();
break;
}
action?.Process();
}
/// <summary>
/// Download a file from the server.
/// </summary>
/// <param name='fileName'>
/// File name of the file (full path)
/// </param>
/// <param name='handler'>
/// Callback handler that is invoked for each chunk of the file received
/// </param>
/// <param name='parameter'>
/// User provided parameter that is passed to the callback handler
/// </param>
public void GetFile(string fileName, GetFileHandler handler, object parameter)
{
int error;
GetFileCallback getFileCallback = new GetFileCallback(handler, parameter);
GCHandle handle = GCHandle.Alloc(getFileCallback);
IedConnection_getFile(connection, out error, fileName, new InternalIedClientGetFileHandler(iedClientGetFileHandler),
GCHandle.ToIntPtr(handle));
if (error != 0)
throw new IedConnectionException("Error reading file", error);
handle.Free();
}
public GetFileCallback(GetFileHandler handler, object parameter)
{
this.handler = handler;
this.parameter = parameter;
}
public async Task <IActionResult> Get(Guid fileId, [FromServices] GetFileHandler fh)
{
var(stream, file) = await fh.Get(fileId);
return(File(stream, file.ContentType, file.FileName));
}