54 lines
2.1 KiB
C#
54 lines
2.1 KiB
C#
using System;
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using System.IO;
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using Microsoft.Net.Http.Headers;
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namespace IRaCIS.Core.API.Utility
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{
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public static class MultipartRequestHelper
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{
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// Content-Type: multipart/form-data; boundary="----WebKitFormBoundarymx2fSWqWSd0OxQqq"
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// The spec at https://tools.ietf.org/html/rfc2046#section-5.1 states that 70 characters is a reasonable limit.
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public static string GetBoundary(MediaTypeHeaderValue contentType, int lengthLimit)
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{
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var boundary = HeaderUtilities.RemoveQuotes(contentType.Boundary).Value;
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if (string.IsNullOrWhiteSpace(boundary))
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{
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throw new InvalidDataException("Missing content-type boundary.");
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}
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if (boundary.Length > lengthLimit)
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{
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throw new InvalidDataException(
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$"Multipart boundary length limit {lengthLimit} exceeded.");
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}
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return boundary;
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}
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public static bool IsMultipartContentType(string contentType)
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{
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return !string.IsNullOrEmpty(contentType)
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&& contentType.IndexOf("multipart/", StringComparison.OrdinalIgnoreCase) >= 0;
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}
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public static bool HasFormDataContentDisposition(ContentDispositionHeaderValue contentDisposition)
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{
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// Content-Disposition: form-data; name="key";
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return contentDisposition != null
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&& contentDisposition.DispositionType.Equals("form-data")
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&& string.IsNullOrEmpty(contentDisposition.FileName.Value)
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&& string.IsNullOrEmpty(contentDisposition.FileNameStar.Value);
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}
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public static bool HasFileContentDisposition(ContentDispositionHeaderValue contentDisposition)
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{
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// Content-Disposition: form-data; name="myfile1"; filename="Misc 002.jpg"
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return contentDisposition != null
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&& contentDisposition.DispositionType.Equals("form-data")
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&& (!string.IsNullOrEmpty(contentDisposition.FileName.Value)
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|| !string.IsNullOrEmpty(contentDisposition.FileNameStar.Value));
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}
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}
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}
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