As extensões de arquivo e tipos MIME em .NET
https://stackoverflow.com/questions/1612767
-
06-07-2019 - |
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Eu quero conseguir um MIME Content-Type de uma determinada extensão (de preferência sem acessar o arquivo físico). Tenho visto algumas perguntas sobre este e os métodos descritos para executar esta pode ser retomada em:
- informações do Registro .
- Use o urlmon.dll FindMimeFromData .
- IIS informações .
- Roll seu próprio função de mapeamento MIME. Baseado em esta tabela , por exemplo.
Eu tenho usado no.1 por algum tempo, mas eu percebi que as informações fornecidas pelo registro não é consistente e depende do software instalado na máquina. Algumas extensões, como .zip não use para ter um Content-Type especificado.
Solução no.2 me obriga a ter o arquivo no disco, a fim de ler os primeiros bytes, que é algo lento, mas pode obter bons resultados.
O terceiro método é baseado em serviços de diretório e todas essas coisas, o que é algo que eu não gosto muito, porque eu tenho que adicionar referências COM e eu não tenho certeza que é consistente entre IIS6 e IIS7. Além disso, eu não sei o desempenho deste método.
Finalmente, eu não quero usar a minha própria mesa, mas no final parece ser a melhor opção se eu quero um desempenho decente e consistência dos resultados entre plataformas (mesmo mono).
Você acha que há uma opção melhor do que usar a minha própria mesa ou um dos outros métodos descritos são melhores? Qual é a sua experiência?
Solução
Depende do que você precisa o tipo MIME para. Em geral, para serviços (aplicativos web, serviços web, etc.), é aconselhável não usar uma lista MIME que é dependente das configurações do sistema operacional, ou apenas como alternativa se você não pode encontrar informações MIME contrário.
Eu acho que esta é também a razão pela qual MS escolheu colocar tipos MIME constantes em sua classe System.Web.MimeMapping (infelizmente é interna, por qualquer motivo).
Editar:
envoltório (<= NET 3.5)
public static class MimeExtensionHelper
{
static object locker = new object();
static object mimeMapping;
static MethodInfo getMimeMappingMethodInfo;
static MimeExtensionHelper()
{
Type mimeMappingType = Assembly.GetAssembly(typeof(HttpRuntime)).GetType("System.Web.MimeMapping");
if (mimeMappingType == null)
throw new SystemException("Couldnt find MimeMapping type");
ConstructorInfo constructorInfo = mimeMappingType.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, Type.EmptyTypes, null);
if (constructorInfo == null)
throw new SystemException("Couldnt find default constructor for MimeMapping");
mimeMapping = constructorInfo.Invoke(null);
if (mimeMapping == null)
throw new SystemException("Couldnt find MimeMapping");
getMimeMappingMethodInfo = mimeMappingType.GetMethod("GetMimeMapping", BindingFlags.Static | BindingFlags.NonPublic);
if (getMimeMappingMethodInfo == null)
throw new SystemException("Couldnt find GetMimeMapping method");
if (getMimeMappingMethodInfo.ReturnType != typeof(string))
throw new SystemException("GetMimeMapping method has invalid return type");
if (getMimeMappingMethodInfo.GetParameters().Length != 1 && getMimeMappingMethodInfo.GetParameters()[0].ParameterType != typeof(string))
throw new SystemException("GetMimeMapping method has invalid parameters");
}
public static string GetMimeType(string filename)
{
lock (locker)
return (string)getMimeMappingMethodInfo.Invoke(mimeMapping, new object[] { filename });
}
}
Wrapper (.NET 4.0)
public static class MimeExtensionHelper
{
static object locker = new object();
static object mimeMapping;
static MethodInfo getMimeMappingMethodInfo;
static MimeExtensionHelper()
{
Type mimeMappingType = Assembly.GetAssembly(typeof(HttpRuntime)).GetType("System.Web.MimeMapping");
if (mimeMappingType == null)
throw new SystemException("Couldnt find MimeMapping type");
getMimeMappingMethodInfo = mimeMappingType.GetMethod("GetMimeMapping", BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public);
if (getMimeMappingMethodInfo == null)
throw new SystemException("Couldnt find GetMimeMapping method");
if (getMimeMappingMethodInfo.ReturnType != typeof(string))
throw new SystemException("GetMimeMapping method has invalid return type");
if (getMimeMappingMethodInfo.GetParameters().Length != 1 && getMimeMappingMethodInfo.GetParameters()[0].ParameterType != typeof(string))
throw new SystemException("GetMimeMapping method has invalid parameters");
}
public static string GetMimeType(string filename)
{
lock (locker)
return (string)getMimeMappingMethodInfo.Invoke(mimeMapping, new object[] { filename });
}
}
.NET 4.5 +
No invólucro necessário, chamar o método público System.Web.MimeMapping.GetMimeMapping diretamente.
Outras dicas
Eu combinei todas essas abordagens na minha lib utilidade, exceto, talvez, no.3. Btw, no.2 (urlmon.dll) não requer arquivo estático, ele simplesmente leva algum bytes não importa onde eles tinham vindo. Aqui está a minha classe atual
namespace Components
{
using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Xml.Serialization;
using Microsoft.Win32;
public sealed class MimeExtensionHelper
{
private MimeExtensionHelper() { }
/// <summary>Finds extension associated with specified mime type</summary>
/// <param name="mimeType">mime type you search extension for, e.g.: "application/octet-stream"</param>
/// <returns>most used extension, associated with provided type, e.g.: ".bin"</returns>
public static string FindExtension(string mimeType)
{
return ExtensionTypes.GetExtension(mimeType);
}
/// <summary>Finds mime type using provided extension and/or file's binary content.</summary>
/// <param name="file">Full file path</param>
/// <param name="verifyFromContent">Should the file's content be examined to verify founded value.</param>
/// <returns>mime type of file, e.g.: "application/octet-stream"</returns>
public static string FindMime(string file,bool verifyFromContent)
{
string extension = Path.GetExtension(file);
string mimeType = string.Empty;
try
{
if (!String.IsNullOrEmpty(extension))
mimeType = ExtensionTypes.GetMimeType(extension);
if (verifyFromContent
|| (String.IsNullOrEmpty(mimeType) && File.Exists(file)))
mimeType = FindMimeByContent(file,mimeType);
}
catch { }
return (mimeType ?? string.Empty).Trim();//"application/octet-stream"
}
/// <summary>Finds mime type for file using it's binary data.</summary>
/// <param name="file">Full path to file.</param>
/// <param name="proposedType">Optional. Expected file's type.</param>
/// <returns>mime type, e.g.: "application/octet-stream"</returns>
public static string FindMimeByContent(string file
,string proposedType)
{
FileInfo fi = new FileInfo(file);
if (!fi.Exists)
throw new FileNotFoundException(file);
byte[] buf = new byte[Math.Min(4096L,fi.Length)];
using (FileStream fs = File.OpenRead(file))
fs.Read(buf,0,buf.Length);
return FindMimeByData(buf,proposedType);
}
/// <summary>Finds mime type for binary data.</summary>
/// <param name="dataBytes">Binary data to examine.</param>
/// <param name="mimeProposed">Optional. Expected mime type.</param>
/// <returns>mime type, e.g.: "application/octet-stream"</returns>
public static string FindMimeByData(byte[] dataBytes,string mimeProposed)
{
if (dataBytes == null || dataBytes.Length == 0)
throw new ArgumentNullException("dataBytes");
string mimeRet = String.Empty;
IntPtr outPtr = IntPtr.Zero;
if (!String.IsNullOrEmpty(mimeProposed))
mimeRet = mimeProposed;
int result = FindMimeFromData(IntPtr.Zero
,null
,dataBytes
,dataBytes.Length
,String.IsNullOrEmpty(mimeProposed) ? null : mimeProposed
,0
,out outPtr
,0);
if (result != 0)
throw Marshal.GetExceptionForHR(result);
if (outPtr != null && outPtr != IntPtr.Zero)
{
mimeRet = Marshal.PtrToStringUni(outPtr);
Marshal.FreeCoTaskMem(outPtr);
}
return mimeRet;
}
[DllImport("urlmon.dll"
,CharSet = CharSet.Unicode
,ExactSpelling = true
,SetLastError = true)]
static extern Int32 FindMimeFromData(IntPtr pBC
,[MarshalAs(UnmanagedType.LPWStr)] String pwzUrl
,[MarshalAs(UnmanagedType.LPArray,ArraySubType = UnmanagedType.I1,SizeParamIndex = 3)] Byte[] pBuffer
,Int32 cbSize
,[MarshalAs(UnmanagedType.LPWStr)] String pwzMimeProposed
,Int32 dwMimeFlags
,out IntPtr ppwzMimeOut
,Int32 dwReserved);
private static MimeTypeCollection _extensionTypes = null;
private static MimeTypeCollection ExtensionTypes
{
get
{
if (_extensionTypes == null)
_extensionTypes = new MimeTypeCollection();
return _extensionTypes;
}
}
[Serializable]
[XmlRoot(ElementName = "mimeTypes")]
private class MimeTypeCollection : List<MimeTypeCollection.mimeTypeInfo>
{
private SortedList<string,string> _extensions;
private SortedList<string,List<string>> _mimes;
private void Init()
{
if (_extensions == null || _mimes == null
|| _extensions.Count == 0 || _mimes.Count == 0)
{
_extensions = new SortedList<string,string>(StringComparer.OrdinalIgnoreCase);
_mimes = new SortedList<string,List<string>>(StringComparer.OrdinalIgnoreCase);
foreach (var mime in this)
{
_mimes.Add(mime.MimeType,new List<string>(mime.Extensions));
foreach (string ext in mime.Extensions)
if (!_extensions.ContainsKey(ext))
_extensions.Add(ext,mime.MimeType);
}
}
}
public String GetExtension(string type)
{
Init();
return _mimes.ContainsKey(type) ? _mimes[type][0] : string.Empty;
}
public String GetMimeType(string extension)
{
Init();
return _extensions.ContainsKey(extension) ? _extensions[extension] : string.Empty;
}
public MimeTypeCollection()
{
this.Add(new mimeTypeInfo("application/applixware",new List<string>(new[] { ".aw" })));
this.Add(new mimeTypeInfo("application/atom+xml",new List<string>(new[] { ".atom" })));
// ... Whole list from apache's site
this.Add(new mimeTypeInfo("x-x509-ca-cert",new List<string>(new[] { ".cer" })));
try
{
using (RegistryKey classesRoot = Registry.ClassesRoot)
using (RegistryKey typeKey = classesRoot.OpenSubKey(@"MIME\Database\Content Type"))
{
string[] subKeyNames = typeKey.GetSubKeyNames();
string extension = string.Empty;
foreach (string keyname in subKeyNames)
{
string trimmed = (keyname ?? string.Empty).Trim();
if (string.IsNullOrEmpty(trimmed))
continue;
if (!String.IsNullOrEmpty(GetExtension(trimmed)))
continue;
string subKey = "MIME\\Database\\Content Type\\" + trimmed;
using (RegistryKey curKey = classesRoot.OpenSubKey(subKey))
{
extension = (curKey.GetValue("Extension") as string ?? string.Empty).Trim();
if (extension.Length > 0)
this.Add(new mimeTypeInfo(trimmed
,new List<string>(new[] { extension })));
}
}
}
}
catch (Exception ex)
{
string s = ex.ToString();
}
}
[Serializable]
public class mimeTypeInfo
{
[XmlAttribute(AttributeName = "mimeType")]
public String MimeType { get; set; }
[XmlElement("extension")]
public List<String> Extensions { get; set; }
public mimeTypeInfo(string mimeType,List<string> extensions)
{
MimeType = mimeType;
Extensions = extensions;
}
public mimeTypeInfo() { }
}
}
}
}
O System.Web.MimeMapping tem 3 versões - dois 4.0s versão (em que um deles é interno), e em seguida, uma versão 2.0, que também é interna. Como fora pontas, há uma versão pública da classe em System.Web versão 4.0 para o .NET framework 4.5.
Para RoadkillWiki Eu basicamente engenharia reversa-lo para salvar o incômodo de refletir cada vez, tentativas de manipulador de arquivos do wiki para o uso IIS / applicationhost.config por padrão, e então cai até a classe MimeMapping:
private string GetMimeType(string fileExtension, ServerManager serverManager)
{
try
{
string mimeType = "text/plain";
Microsoft.Web.Administration.Configuration config = serverManager.GetApplicationHostConfiguration();
ConfigurationSection staticContentSection = config.GetSection("system.webServer/staticContent");
ConfigurationElementCollection mimemaps = staticContentSection.GetCollection();
ConfigurationElement element = mimemaps.FirstOrDefault(m => m.Attributes["fileExtension"].Value.ToString() == fileExtension);
if (element != null)
mimeType = element.Attributes["mimeType"].Value.ToString();
return mimeType;
}
catch (UnauthorizedAccessException)
{
// Shared hosting won't have access to the applicationhost.config file
return MimeMapping.GetMimeMapping("." +fileExtension);
}
}
E MimeMapping:
public class MimeMapping
{
private static Dictionary<string, string> ExtensionMap = new Dictionary<string, string>();
static MimeMapping()
{
ExtensionMap.Add(".323", "text/h323");
ExtensionMap.Add(".asx", "video/x-ms-asf");
ExtensionMap.Add(".acx", "application/internet-property-stream");
ExtensionMap.Add(".ai", "application/postscript");
ExtensionMap.Add(".aif", "audio/x-aiff");
ExtensionMap.Add(".aiff", "audio/aiff");
ExtensionMap.Add(".axs", "application/olescript");
ExtensionMap.Add(".aifc", "audio/aiff");
ExtensionMap.Add(".asr", "video/x-ms-asf");
ExtensionMap.Add(".avi", "video/x-msvideo");
ExtensionMap.Add(".asf", "video/x-ms-asf");
ExtensionMap.Add(".au", "audio/basic");
ExtensionMap.Add(".application", "application/x-ms-application");
ExtensionMap.Add(".bin", "application/octet-stream");
ExtensionMap.Add(".bas", "text/plain");
ExtensionMap.Add(".bcpio", "application/x-bcpio");
ExtensionMap.Add(".bmp", "image/bmp");
ExtensionMap.Add(".cdf", "application/x-cdf");
ExtensionMap.Add(".cat", "application/vndms-pkiseccat");
ExtensionMap.Add(".crt", "application/x-x509-ca-cert");
ExtensionMap.Add(".c", "text/plain");
ExtensionMap.Add(".css", "text/css");
ExtensionMap.Add(".cer", "application/x-x509-ca-cert");
ExtensionMap.Add(".crl", "application/pkix-crl");
ExtensionMap.Add(".cmx", "image/x-cmx");
ExtensionMap.Add(".csh", "application/x-csh");
ExtensionMap.Add(".cod", "image/cis-cod");
ExtensionMap.Add(".cpio", "application/x-cpio");
ExtensionMap.Add(".clp", "application/x-msclip");
ExtensionMap.Add(".crd", "application/x-mscardfile");
ExtensionMap.Add(".deploy", "application/octet-stream");
ExtensionMap.Add(".dll", "application/x-msdownload");
ExtensionMap.Add(".dot", "application/msword");
ExtensionMap.Add(".doc", "application/msword");
ExtensionMap.Add(".dvi", "application/x-dvi");
ExtensionMap.Add(".dir", "application/x-director");
ExtensionMap.Add(".dxr", "application/x-director");
ExtensionMap.Add(".der", "application/x-x509-ca-cert");
ExtensionMap.Add(".dib", "image/bmp");
ExtensionMap.Add(".dcr", "application/x-director");
ExtensionMap.Add(".disco", "text/xml");
ExtensionMap.Add(".exe", "application/octet-stream");
ExtensionMap.Add(".etx", "text/x-setext");
ExtensionMap.Add(".evy", "application/envoy");
ExtensionMap.Add(".eml", "message/rfc822");
ExtensionMap.Add(".eps", "application/postscript");
ExtensionMap.Add(".flr", "x-world/x-vrml");
ExtensionMap.Add(".fif", "application/fractals");
ExtensionMap.Add(".gtar", "application/x-gtar");
ExtensionMap.Add(".gif", "image/gif");
ExtensionMap.Add(".gz", "application/x-gzip");
ExtensionMap.Add(".hta", "application/hta");
ExtensionMap.Add(".htc", "text/x-component");
ExtensionMap.Add(".htt", "text/webviewhtml");
ExtensionMap.Add(".h", "text/plain");
ExtensionMap.Add(".hdf", "application/x-hdf");
ExtensionMap.Add(".hlp", "application/winhlp");
ExtensionMap.Add(".html", "text/html");
ExtensionMap.Add(".htm", "text/html");
ExtensionMap.Add(".hqx", "application/mac-binhex40");
ExtensionMap.Add(".isp", "application/x-internet-signup");
ExtensionMap.Add(".iii", "application/x-iphone");
ExtensionMap.Add(".ief", "image/ief");
ExtensionMap.Add(".ivf", "video/x-ivf");
ExtensionMap.Add(".ins", "application/x-internet-signup");
ExtensionMap.Add(".ico", "image/x-icon");
ExtensionMap.Add(".jpg", "image/jpeg");
ExtensionMap.Add(".jfif", "image/pjpeg");
ExtensionMap.Add(".jpe", "image/jpeg");
ExtensionMap.Add(".jpeg", "image/jpeg");
ExtensionMap.Add(".js", "application/x-javascript");
ExtensionMap.Add(".lsx", "video/x-la-asf");
ExtensionMap.Add(".latex", "application/x-latex");
ExtensionMap.Add(".lsf", "video/x-la-asf");
ExtensionMap.Add(".manifest", "application/x-ms-manifest");
ExtensionMap.Add(".mhtml", "message/rfc822");
ExtensionMap.Add(".mny", "application/x-msmoney");
ExtensionMap.Add(".mht", "message/rfc822");
ExtensionMap.Add(".mid", "audio/mid");
ExtensionMap.Add(".mpv2", "video/mpeg");
ExtensionMap.Add(".man", "application/x-troff-man");
ExtensionMap.Add(".mvb", "application/x-msmediaview");
ExtensionMap.Add(".mpeg", "video/mpeg");
ExtensionMap.Add(".m3u", "audio/x-mpegurl");
ExtensionMap.Add(".mdb", "application/x-msaccess");
ExtensionMap.Add(".mpp", "application/vnd.ms-project");
ExtensionMap.Add(".m1v", "video/mpeg");
ExtensionMap.Add(".mpa", "video/mpeg");
ExtensionMap.Add(".me", "application/x-troff-me");
ExtensionMap.Add(".m13", "application/x-msmediaview");
ExtensionMap.Add(".movie", "video/x-sgi-movie");
ExtensionMap.Add(".m14", "application/x-msmediaview");
ExtensionMap.Add(".mpe", "video/mpeg");
ExtensionMap.Add(".mp2", "video/mpeg");
ExtensionMap.Add(".mov", "video/quicktime");
ExtensionMap.Add(".mp3", "audio/mpeg");
ExtensionMap.Add(".mpg", "video/mpeg");
ExtensionMap.Add(".ms", "application/x-troff-ms");
ExtensionMap.Add(".nc", "application/x-netcdf");
ExtensionMap.Add(".nws", "message/rfc822");
ExtensionMap.Add(".oda", "application/oda");
ExtensionMap.Add(".ods", "application/oleobject");
ExtensionMap.Add(".pmc", "application/x-perfmon");
ExtensionMap.Add(".p7r", "application/x-pkcs7-certreqresp");
ExtensionMap.Add(".p7b", "application/x-pkcs7-certificates");
ExtensionMap.Add(".p7s", "application/pkcs7-signature");
ExtensionMap.Add(".pmw", "application/x-perfmon");
ExtensionMap.Add(".ps", "application/postscript");
ExtensionMap.Add(".p7c", "application/pkcs7-mime");
ExtensionMap.Add(".pbm", "image/x-portable-bitmap");
ExtensionMap.Add(".ppm", "image/x-portable-pixmap");
ExtensionMap.Add(".pub", "application/x-mspublisher");
ExtensionMap.Add(".pnm", "image/x-portable-anymap");
ExtensionMap.Add(".pml", "application/x-perfmon");
ExtensionMap.Add(".p10", "application/pkcs10");
ExtensionMap.Add(".pfx", "application/x-pkcs12");
ExtensionMap.Add(".p12", "application/x-pkcs12");
ExtensionMap.Add(".pdf", "application/pdf");
ExtensionMap.Add(".pps", "application/vnd.ms-powerpoint");
ExtensionMap.Add(".p7m", "application/pkcs7-mime");
ExtensionMap.Add(".pko", "application/vndms-pkipko");
ExtensionMap.Add(".ppt", "application/vnd.ms-powerpoint");
ExtensionMap.Add(".pmr", "application/x-perfmon");
ExtensionMap.Add(".pma", "application/x-perfmon");
ExtensionMap.Add(".pot", "application/vnd.ms-powerpoint");
ExtensionMap.Add(".prf", "application/pics-rules");
ExtensionMap.Add(".pgm", "image/x-portable-graymap");
ExtensionMap.Add(".qt", "video/quicktime");
ExtensionMap.Add(".ra", "audio/x-pn-realaudio");
ExtensionMap.Add(".rgb", "image/x-rgb");
ExtensionMap.Add(".ram", "audio/x-pn-realaudio");
ExtensionMap.Add(".rmi", "audio/mid");
ExtensionMap.Add(".ras", "image/x-cmu-raster");
ExtensionMap.Add(".roff", "application/x-troff");
ExtensionMap.Add(".rtf", "application/rtf");
ExtensionMap.Add(".rtx", "text/richtext");
ExtensionMap.Add(".sv4crc", "application/x-sv4crc");
ExtensionMap.Add(".spc", "application/x-pkcs7-certificates");
ExtensionMap.Add(".setreg", "application/set-registration-initiation");
ExtensionMap.Add(".snd", "audio/basic");
ExtensionMap.Add(".stl", "application/vndms-pkistl");
ExtensionMap.Add(".setpay", "application/set-payment-initiation");
ExtensionMap.Add(".stm", "text/html");
ExtensionMap.Add(".shar", "application/x-shar");
ExtensionMap.Add(".sh", "application/x-sh");
ExtensionMap.Add(".sit", "application/x-stuffit");
ExtensionMap.Add(".spl", "application/futuresplash");
ExtensionMap.Add(".sct", "text/scriptlet");
ExtensionMap.Add(".scd", "application/x-msschedule");
ExtensionMap.Add(".sst", "application/vndms-pkicertstore");
ExtensionMap.Add(".src", "application/x-wais-source");
ExtensionMap.Add(".sv4cpio", "application/x-sv4cpio");
ExtensionMap.Add(".tex", "application/x-tex");
ExtensionMap.Add(".tgz", "application/x-compressed");
ExtensionMap.Add(".t", "application/x-troff");
ExtensionMap.Add(".tar", "application/x-tar");
ExtensionMap.Add(".tr", "application/x-troff");
ExtensionMap.Add(".tif", "image/tiff");
ExtensionMap.Add(".txt", "text/plain");
ExtensionMap.Add(".texinfo", "application/x-texinfo");
ExtensionMap.Add(".trm", "application/x-msterminal");
ExtensionMap.Add(".tiff", "image/tiff");
ExtensionMap.Add(".tcl", "application/x-tcl");
ExtensionMap.Add(".texi", "application/x-texinfo");
ExtensionMap.Add(".tsv", "text/tab-separated-values");
ExtensionMap.Add(".ustar", "application/x-ustar");
ExtensionMap.Add(".uls", "text/iuls");
ExtensionMap.Add(".vcf", "text/x-vcard");
ExtensionMap.Add(".wps", "application/vnd.ms-works");
ExtensionMap.Add(".wav", "audio/wav");
ExtensionMap.Add(".wrz", "x-world/x-vrml");
ExtensionMap.Add(".wri", "application/x-mswrite");
ExtensionMap.Add(".wks", "application/vnd.ms-works");
ExtensionMap.Add(".wmf", "application/x-msmetafile");
ExtensionMap.Add(".wcm", "application/vnd.ms-works");
ExtensionMap.Add(".wrl", "x-world/x-vrml");
ExtensionMap.Add(".wdb", "application/vnd.ms-works");
ExtensionMap.Add(".wsdl", "text/xml");
ExtensionMap.Add(".xml", "text/xml");
ExtensionMap.Add(".xlm", "application/vnd.ms-excel");
ExtensionMap.Add(".xaf", "x-world/x-vrml");
ExtensionMap.Add(".xla", "application/vnd.ms-excel");
ExtensionMap.Add(".xls", "application/vnd.ms-excel");
ExtensionMap.Add(".xof", "x-world/x-vrml");
ExtensionMap.Add(".xlt", "application/vnd.ms-excel");
ExtensionMap.Add(".xlc", "application/vnd.ms-excel");
ExtensionMap.Add(".xsl", "text/xml");
ExtensionMap.Add(".xbm", "image/x-xbitmap");
ExtensionMap.Add(".xlw", "application/vnd.ms-excel");
ExtensionMap.Add(".xpm", "image/x-xpixmap");
ExtensionMap.Add(".xwd", "image/x-xwindowdump");
ExtensionMap.Add(".xsd", "text/xml");
ExtensionMap.Add(".z", "application/x-compress");
ExtensionMap.Add(".zip", "application/x-zip-compressed");
ExtensionMap.Add(".*", "application/octet-stream");
}
public static string GetMimeMapping(string fileExtension)
{
if (ExtensionMap.ContainsKey(fileExtension))
return ExtensionMap[fileExtension];
else
return ExtensionMap[".*"];
}
}
Eu escrevi um programa para buscar e converter o arquivo mime.types Apache para um C # Dictionary<string, string> introduzidos pela extensão do arquivo. É aqui:
https://github.com/cymen/ApacheMimeTypesToDotNet
A saída real é este arquivo:
https://github.com/cymen/ApacheMimeTypesToDotNet/blob/master/ApacheMimeTypes.cs
Esperemos que alguém acha útil também!
Niso - você estaria disposto a colocar todo o código-fonte para o seu lugar de utilidade? que seria realmente útil. obrigado!
Nunca mente ....
Eu editei o arquivo de definição apache para conter apenas entradas com extensões definidas, em seguida, estendeu o código para carregar nos tipos / extensões do arquivo de texto em tempo de execução. Não elegante, talvez, mas com certeza é melhor criação / manutenção de 630 linhas de código-fonte para os tipos MIME.
[no construtor para MimeTypeCollection em vez deste material: this.Add (novo mimeTypeInfo ( "application / Applixware", new List (new [] { ".aw"})));]
// import mime/extension definition list to facilitate maintenance
string dir = AppDomain.CurrentDomain.BaseDirectory;
using (TextReader streamReader = new StreamReader(Path.Combine(dir, "MimeDefinitions.txt")))
{
string input;
while ((input = streamReader.ReadLine()) != null)
{
if (input.Substring(0, 1) != "#")
{
// text line format ::= [contenttype]<tab>[space delimited list of extensions, without dot]
string contentType = input.Group("0\t1");
string extensionList = input.Group("1\t1");
string[] extensions = extensionList.Split(" ".ToCharArray());
List<string> extensionSet = new List<string>();
foreach (string term in extensions)
{
extensionSet.Add("."+term);
}
this.Add(new mimeTypeInfo(contentType, extensionSet));
}
}
}
Eu também achei que o método init () seria chamado e os _extensions e _mime membros não seriam completamente inicializado então eu mudei-lo para ler:
if (_extensions == null || _mimes == null || _mimes.Count != this.Count)
De qualquer forma, eu agora como uma classe que pode lidar com os defs externos e Registro local que eu precisava.
Obrigado!
Eu também achei que o método init () seria chamado e os _extensions e _mime membros não seriam completamente inicializado então eu mudei-lo para ler, ea melhor maneira é, chamada remove GetExtension no construtor de MimeTypeCollection:
public MimeTypeCollection()
{
this.Add(new mimeTypeInfo("application/applixware", new List<string>(new[] { ".aw" })));
this.Add(new mimeTypeInfo("application/atom+xml", new List<string>(new[] { ".atom" })));
// ... Whole list from apache's site
this.Add(new mimeTypeInfo("x-x509-ca-cert", new List<string>(new[] { ".cer" })));
try
{
using (RegistryKey classesRoot = Registry.ClassesRoot)
using (RegistryKey typeKey = classesRoot.OpenSubKey(@"MIME\Database\Content Type"))
{
string[] subKeyNames = typeKey.GetSubKeyNames();
string extension = string.Empty;
foreach (string keyname in subKeyNames)
{
string trimmed = (keyname ?? string.Empty).Trim();
if (string.IsNullOrEmpty(trimmed))
continue;
if (this.Exists(mime => mime.MimeType == trimmed))
continue;
//if (!String.IsNullOrEmpty(GetExtension(trimmed)))
// continue;
string subKey = "MIME\\Database\\Content Type\\" + trimmed;
using (RegistryKey curKey = classesRoot.OpenSubKey(subKey))
{
extension = (curKey.GetValue("Extension") as string ?? string.Empty).Trim();
if (extension.Length > 0)
this.Add(new mimeTypeInfo(trimmed
, new List<string>(new[] { extension })));
}
}
}
}
catch (Exception ex)
{
string s = ex.ToString();
}
}
Eu apenas gostaria de adverti-lo contra recuperar o tipo MIME / conteúdo de um arquivo sem validá-lo contra o conteúdo real do arquivo, como ele poderia representar um sério risco de segurança para o seu sistema e os usuários.
Embora existam casos de uso válidos para algo como isso, os atacantes podem potencialmente atacar seu sistema ou usá-lo como um mecanismo para propagar ficheiros maliciosos para outros usuários, disfarçando executáveis ??ou scripts como outros tipos de arquivos, não suspeitos.
É aconselhável que você considerar seriamente sandboxing e realizando inspeção profunda de conteúdo em arquivos enviados antes de continuar a processá-lo (ou torná-lo disponível para download).
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