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50 changes: 50 additions & 0 deletions
50
backend/LexBoxApi/Controllers/ActionResults/FileCallbackResult.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| using Microsoft.AspNetCore.Mvc; | ||
| using Microsoft.AspNetCore.Mvc.Infrastructure; | ||
|
|
||
| namespace LexBoxApi.Controllers.ActionResults; | ||
|
|
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| /// <summary> | ||
| /// Represents an <see cref="ActionResult"/> that when executed will | ||
| /// execute a callback to write the file content out as a stream. | ||
| /// copied from https://github.com/StephenClearyExamples/AsyncDynamicZip/tree/net6-ziparchive | ||
| /// MIT License | ||
| /// </summary> | ||
| public sealed class FileCallbackResult : FileResult | ||
| { | ||
| private readonly Func<Stream, ActionContext, Task> _callback; | ||
|
|
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| /// <summary> | ||
| /// Creates a new <see cref="FileCallbackResult"/> instance. | ||
| /// </summary> | ||
| /// <param name="contentType">The Content-Type header of the response.</param> | ||
| /// <param name="callback">The stream with the file.</param> | ||
| public FileCallbackResult(string contentType, Func<Stream, ActionContext, Task> callback) | ||
| : base(contentType) | ||
| { | ||
| _ = callback ?? throw new ArgumentNullException(nameof(callback)); | ||
| _callback = callback; | ||
| } | ||
|
|
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| /// <inheritdoc /> | ||
| public override Task ExecuteResultAsync(ActionContext context) | ||
| { | ||
| _ = context ?? throw new ArgumentNullException(nameof(context)); | ||
| var executor = | ||
| new FileCallbackResultExecutor(context.HttpContext.RequestServices.GetRequiredService<ILoggerFactory>()); | ||
| return executor.ExecuteAsync(context, this); | ||
| } | ||
|
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| private sealed class FileCallbackResultExecutor : FileResultExecutorBase | ||
| { | ||
| public FileCallbackResultExecutor(ILoggerFactory loggerFactory) | ||
| : base(CreateLogger<FileCallbackResultExecutor>(loggerFactory)) | ||
| { | ||
| } | ||
|
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| public Task ExecuteAsync(ActionContext context, FileCallbackResult result) | ||
| { | ||
| SetHeadersAndLog(context, result, fileLength: null, enableRangeProcessing: false); | ||
| return result._callback(context.HttpContext.Response.BodyWriter.AsStream(), context); | ||
| } | ||
| } | ||
| } |
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