[C#] 파일 확장자로 mime-type 구하기(File Extension)

안녕하세요.

 

오늘은 파일을 업로드할 때 필요한 content-type을 파일의 확장자 별로 구하는 방법에 대해 알아보도록 하겠습니다.

 

다행히도 Windows에서는 해당 값에 대한 Mime-Type을 레지스트리 편집기에 정의해 두었습니다.

 

레지스트리 편집기에 들어가보면 여러 확장자에 대한 Content Type값이 들어있는 것을 확인하실 수 있습니다.

(컴퓨터\HKEY_CLASSES_ROOT의 하위에는 .xxx와 같은 형식의 폴더가 많이 존재합니다.)

 

따라서 오늘은 이 값을 이용하여 확장자에 대한 mime-type(content-type)을 구해보도록 하겠습니다.

 

 

방법은 아주 간단합니다.

 

아래는 해당 값을 읽어오는 코드입니다.

public string GetMimeType(string fileName)
{
    string mimeType = null;
    string ext = System.IO.Path.GetExtension(fileName).ToLower();
    Microsoft.Win32.RegistryKey regKey =  Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
    if (regKey != null && regKey.GetValue("Content Type") != null)
        mimeType = regKey.GetValue("Content Type").ToString();
    return mimeType;
}

 

 

 

---

https://stackoverflow.com/questions/1029740/get-mime-type-from-filename-extension

Get MIME type from filename extension

 

위 링크에 따르면, 

 

string mimeType = MimeMapping.GetMimeMapping(fileName);

 

을 사용하여도 된다고 합니다.

 

하지만 .mp4를 Input으로 넣었을 때, video/mp4 가 아닌 application/octet-stream이 나오는 것을 확인하였습니다.

 

stackoverflow에도 비슷한 댓글이 달려있네요.

이점 참고하여 코딩하시기 바랍니다.

 

 

 

왜 이런값이 나오는지 궁금하여 .net framework 코드를 직접 까보았습니다.

 

 

GetMimeMapping 함수는 MimeMapping.cs파일에 정의되어 있고, 해당 파일은 아래 링크에서 코드를 확인해 보실 수 있습니다.

(https://referencesource.microsoft.com/#System.Web/MimeMapping.cs)

 

위 링크에는 아래와 같은 매핑 정보가 들어있고, 해당 매핑 정보에서 값을 얻어서 return합니다.

 

만약 매핑 정보에 없는 값이라면, application/octet-stream을 return하도록 되어있습니다.

 

하지만 매핑 정보에는 mp4나 aac에 대한 매핑 정보가 존재하지 않아 이런 문제가 발생한 것으로 보입니다.

 

아래 접은글 안에 존재하지 않는 확장자를 사용하실 경우에는 해당 기능을 사용하지 않는것을 추천드립니다.

(.mp4가 없으니 타격이 꽤 클듯하네요..)

 

AddMapping(".323", "text/h323");
AddMapping(".aaf", "application/octet-stream");
AddMapping(".aca", "application/octet-stream");
AddMapping(".accdb", "application/msaccess");
AddMapping(".accde", "application/msaccess");
AddMapping(".accdt", "application/msaccess");
AddMapping(".acx", "application/internet-property-stream");
AddMapping(".afm", "application/octet-stream");
AddMapping(".ai", "application/postscript");
AddMapping(".aif", "audio/x-aiff");
AddMapping(".aifc", "audio/aiff");
AddMapping(".aiff", "audio/aiff");
AddMapping(".application", "application/x-ms-application");
AddMapping(".art", "image/x-jg");
AddMapping(".asd", "application/octet-stream");
AddMapping(".asf", "video/x-ms-asf");
AddMapping(".asi", "application/octet-stream");
AddMapping(".asm", "text/plain");
AddMapping(".asr", "video/x-ms-asf");
AddMapping(".asx", "video/x-ms-asf");
AddMapping(".atom", "application/atom+xml");
AddMapping(".au", "audio/basic");
AddMapping(".avi", "video/x-msvideo");
AddMapping(".axs", "application/olescript");
AddMapping(".bas", "text/plain");
AddMapping(".bcpio", "application/x-bcpio");
AddMapping(".bin", "application/octet-stream");
AddMapping(".bmp", "image/bmp");
AddMapping(".c", "text/plain");
AddMapping(".cab", "application/octet-stream");
AddMapping(".calx", "application/vnd.ms-office.calx");
AddMapping(".cat", "application/vnd.ms-pki.seccat");
AddMapping(".cdf", "application/x-cdf");
AddMapping(".chm", "application/octet-stream");
AddMapping(".class", "application/x-java-applet");
AddMapping(".clp", "application/x-msclip");
AddMapping(".cmx", "image/x-cmx");
AddMapping(".cnf", "text/plain");
AddMapping(".cod", "image/cis-cod");
AddMapping(".cpio", "application/x-cpio");
AddMapping(".cpp", "text/plain");
AddMapping(".crd", "application/x-mscardfile");
AddMapping(".crl", "application/pkix-crl");
AddMapping(".crt", "application/x-x509-ca-cert");
AddMapping(".csh", "application/x-csh");
AddMapping(".css", "text/css");
AddMapping(".csv", "application/octet-stream");
AddMapping(".cur", "application/octet-stream");
AddMapping(".dcr", "application/x-director");
AddMapping(".deploy", "application/octet-stream");
AddMapping(".der", "application/x-x509-ca-cert");
AddMapping(".dib", "image/bmp");
AddMapping(".dir", "application/x-director");
AddMapping(".disco", "text/xml");
AddMapping(".dll", "application/x-msdownload");
AddMapping(".dll.config", "text/xml");
AddMapping(".dlm", "text/dlm");
AddMapping(".doc", "application/msword");
AddMapping(".docm", "application/vnd.ms-word.document.macroEnabled.12");
AddMapping(".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document");
AddMapping(".dot", "application/msword");
AddMapping(".dotm", "application/vnd.ms-word.template.macroEnabled.12");
AddMapping(".dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template");
AddMapping(".dsp", "application/octet-stream");
AddMapping(".dtd", "text/xml");
AddMapping(".dvi", "application/x-dvi");
AddMapping(".dwf", "drawing/x-dwf");
AddMapping(".dwp", "application/octet-stream");
AddMapping(".dxr", "application/x-director");
AddMapping(".eml", "message/rfc822");
AddMapping(".emz", "application/octet-stream");
AddMapping(".eot", "application/octet-stream");
AddMapping(".eps", "application/postscript");
AddMapping(".etx", "text/x-setext");
AddMapping(".evy", "application/envoy");
AddMapping(".exe", "application/octet-stream");
AddMapping(".exe.config", "text/xml");
AddMapping(".fdf", "application/vnd.fdf");
AddMapping(".fif", "application/fractals");
AddMapping(".fla", "application/octet-stream");
AddMapping(".flr", "x-world/x-vrml");
AddMapping(".flv", "video/x-flv");
AddMapping(".gif", "image/gif");
AddMapping(".gtar", "application/x-gtar");
AddMapping(".gz", "application/x-gzip");
AddMapping(".h", "text/plain");
AddMapping(".hdf", "application/x-hdf");
AddMapping(".hdml", "text/x-hdml");
AddMapping(".hhc", "application/x-oleobject");
AddMapping(".hhk", "application/octet-stream");
AddMapping(".hhp", "application/octet-stream");
AddMapping(".hlp", "application/winhlp");
AddMapping(".hqx", "application/mac-binhex40");
AddMapping(".hta", "application/hta");
AddMapping(".htc", "text/x-component");
AddMapping(".htm", "text/html");
AddMapping(".html", "text/html");
AddMapping(".htt", "text/webviewhtml");
AddMapping(".hxt", "text/html");
AddMapping(".ico", "image/x-icon");
AddMapping(".ics", "application/octet-stream");
AddMapping(".ief", "image/ief");
AddMapping(".iii", "application/x-iphone");
AddMapping(".inf", "application/octet-stream");
AddMapping(".ins", "application/x-internet-signup");
AddMapping(".isp", "application/x-internet-signup");
AddMapping(".IVF", "video/x-ivf");
AddMapping(".jar", "application/java-archive");
AddMapping(".java", "application/octet-stream");
AddMapping(".jck", "application/liquidmotion");
AddMapping(".jcz", "application/liquidmotion");
AddMapping(".jfif", "image/pjpeg");
AddMapping(".jpb", "application/octet-stream");
AddMapping(".jpe", "image/jpeg");
AddMapping(".jpeg", "image/jpeg");
AddMapping(".jpg", "image/jpeg");
AddMapping(".js", "application/x-javascript");
AddMapping(".jsx", "text/jscript");
AddMapping(".latex", "application/x-latex");
AddMapping(".lit", "application/x-ms-reader");
AddMapping(".lpk", "application/octet-stream");
AddMapping(".lsf", "video/x-la-asf");
AddMapping(".lsx", "video/x-la-asf");
AddMapping(".lzh", "application/octet-stream");
AddMapping(".m13", "application/x-msmediaview");
AddMapping(".m14", "application/x-msmediaview");
AddMapping(".m1v", "video/mpeg");
AddMapping(".m3u", "audio/x-mpegurl");
AddMapping(".man", "application/x-troff-man");
AddMapping(".manifest", "application/x-ms-manifest");
AddMapping(".map", "text/plain");
AddMapping(".mdb", "application/x-msaccess");
AddMapping(".mdp", "application/octet-stream");
AddMapping(".me", "application/x-troff-me");
AddMapping(".mht", "message/rfc822");
AddMapping(".mhtml", "message/rfc822");
AddMapping(".mid", "audio/mid");
AddMapping(".midi", "audio/mid");
AddMapping(".mix", "application/octet-stream");
AddMapping(".mmf", "application/x-smaf");
AddMapping(".mno", "text/xml");
AddMapping(".mny", "application/x-msmoney");
AddMapping(".mov", "video/quicktime");
AddMapping(".movie", "video/x-sgi-movie");
AddMapping(".mp2", "video/mpeg");
AddMapping(".mp3", "audio/mpeg");
AddMapping(".mpa", "video/mpeg");
AddMapping(".mpe", "video/mpeg");
AddMapping(".mpeg", "video/mpeg");
AddMapping(".mpg", "video/mpeg");
AddMapping(".mpp", "application/vnd.ms-project");
AddMapping(".mpv2", "video/mpeg");
AddMapping(".ms", "application/x-troff-ms");
AddMapping(".msi", "application/octet-stream");
AddMapping(".mso", "application/octet-stream");
AddMapping(".mvb", "application/x-msmediaview");
AddMapping(".mvc", "application/x-miva-compiled");
AddMapping(".nc", "application/x-netcdf");
AddMapping(".nsc", "video/x-ms-asf");
AddMapping(".nws", "message/rfc822");
AddMapping(".ocx", "application/octet-stream");
AddMapping(".oda", "application/oda");
AddMapping(".odc", "text/x-ms-odc");
AddMapping(".ods", "application/oleobject");
AddMapping(".one", "application/onenote");
AddMapping(".onea", "application/onenote");
AddMapping(".onetoc", "application/onenote");
AddMapping(".onetoc2", "application/onenote");
AddMapping(".onetmp", "application/onenote");
AddMapping(".onepkg", "application/onenote");
AddMapping(".osdx", "application/opensearchdescription+xml");
AddMapping(".p10", "application/pkcs10");
AddMapping(".p12", "application/x-pkcs12");
AddMapping(".p7b", "application/x-pkcs7-certificates");
AddMapping(".p7c", "application/pkcs7-mime");
AddMapping(".p7m", "application/pkcs7-mime");
AddMapping(".p7r", "application/x-pkcs7-certreqresp");
AddMapping(".p7s", "application/pkcs7-signature");
AddMapping(".pbm", "image/x-portable-bitmap");
AddMapping(".pcx", "application/octet-stream");
AddMapping(".pcz", "application/octet-stream");
AddMapping(".pdf", "application/pdf");
AddMapping(".pfb", "application/octet-stream");
AddMapping(".pfm", "application/octet-stream");
AddMapping(".pfx", "application/x-pkcs12");
AddMapping(".pgm", "image/x-portable-graymap");
AddMapping(".pko", "application/vnd.ms-pki.pko");
AddMapping(".pma", "application/x-perfmon");
AddMapping(".pmc", "application/x-perfmon");
AddMapping(".pml", "application/x-perfmon");
AddMapping(".pmr", "application/x-perfmon");
AddMapping(".pmw", "application/x-perfmon");
AddMapping(".png", "image/png");
AddMapping(".pnm", "image/x-portable-anymap");
AddMapping(".pnz", "image/png");
AddMapping(".pot", "application/vnd.ms-powerpoint");
AddMapping(".potm", "application/vnd.ms-powerpoint.template.macroEnabled.12");
AddMapping(".potx", "application/vnd.openxmlformats-officedocument.presentationml.template");
AddMapping(".ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12");
AddMapping(".ppm", "image/x-portable-pixmap");
AddMapping(".pps", "application/vnd.ms-powerpoint");
AddMapping(".ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12");
AddMapping(".ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow");
AddMapping(".ppt", "application/vnd.ms-powerpoint");
AddMapping(".pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12");
AddMapping(".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation");
AddMapping(".prf", "application/pics-rules");
AddMapping(".prm", "application/octet-stream");
AddMapping(".prx", "application/octet-stream");
AddMapping(".ps", "application/postscript");
AddMapping(".psd", "application/octet-stream");
AddMapping(".psm", "application/octet-stream");
AddMapping(".psp", "application/octet-stream");
AddMapping(".pub", "application/x-mspublisher");
AddMapping(".qt", "video/quicktime");
AddMapping(".qtl", "application/x-quicktimeplayer");
AddMapping(".qxd", "application/octet-stream");
AddMapping(".ra", "audio/x-pn-realaudio");
AddMapping(".ram", "audio/x-pn-realaudio");
AddMapping(".rar", "application/octet-stream");
AddMapping(".ras", "image/x-cmu-raster");
AddMapping(".rf", "image/vnd.rn-realflash");
AddMapping(".rgb", "image/x-rgb");
AddMapping(".rm", "application/vnd.rn-realmedia");
AddMapping(".rmi", "audio/mid");
AddMapping(".roff", "application/x-troff");
AddMapping(".rpm", "audio/x-pn-realaudio-plugin");
AddMapping(".rtf", "application/rtf");
AddMapping(".rtx", "text/richtext");
AddMapping(".scd", "application/x-msschedule");
AddMapping(".sct", "text/scriptlet");
AddMapping(".sea", "application/octet-stream");
AddMapping(".setpay", "application/set-payment-initiation");
AddMapping(".setreg", "application/set-registration-initiation");
AddMapping(".sgml", "text/sgml");
AddMapping(".sh", "application/x-sh");
AddMapping(".shar", "application/x-shar");
AddMapping(".sit", "application/x-stuffit");
AddMapping(".sldm", "application/vnd.ms-powerpoint.slide.macroEnabled.12");
AddMapping(".sldx", "application/vnd.openxmlformats-officedocument.presentationml.slide");
AddMapping(".smd", "audio/x-smd");
AddMapping(".smi", "application/octet-stream");
AddMapping(".smx", "audio/x-smd");
AddMapping(".smz", "audio/x-smd");
AddMapping(".snd", "audio/basic");
AddMapping(".snp", "application/octet-stream");
AddMapping(".spc", "application/x-pkcs7-certificates");
AddMapping(".spl", "application/futuresplash");
AddMapping(".src", "application/x-wais-source");
AddMapping(".ssm", "application/streamingmedia");
AddMapping(".sst", "application/vnd.ms-pki.certstore");
AddMapping(".stl", "application/vnd.ms-pki.stl");
AddMapping(".sv4cpio", "application/x-sv4cpio");
AddMapping(".sv4crc", "application/x-sv4crc");
AddMapping(".swf", "application/x-shockwave-flash");
AddMapping(".t", "application/x-troff");
AddMapping(".tar", "application/x-tar");
AddMapping(".tcl", "application/x-tcl");
AddMapping(".tex", "application/x-tex");
AddMapping(".texi", "application/x-texinfo");
AddMapping(".texinfo", "application/x-texinfo");
AddMapping(".tgz", "application/x-compressed");
AddMapping(".thmx", "application/vnd.ms-officetheme");
AddMapping(".thn", "application/octet-stream");
AddMapping(".tif", "image/tiff");
AddMapping(".tiff", "image/tiff");
AddMapping(".toc", "application/octet-stream");
AddMapping(".tr", "application/x-troff");
AddMapping(".trm", "application/x-msterminal");
AddMapping(".tsv", "text/tab-separated-values");
AddMapping(".ttf", "application/octet-stream");
AddMapping(".txt", "text/plain");
AddMapping(".u32", "application/octet-stream");
AddMapping(".uls", "text/iuls");
AddMapping(".ustar", "application/x-ustar");
AddMapping(".vbs", "text/vbscript");
AddMapping(".vcf", "text/x-vcard");
AddMapping(".vcs", "text/plain");
AddMapping(".vdx", "application/vnd.ms-visio.viewer");
AddMapping(".vml", "text/xml");
AddMapping(".vsd", "application/vnd.visio");
AddMapping(".vss", "application/vnd.visio");
AddMapping(".vst", "application/vnd.visio");
AddMapping(".vsto", "application/x-ms-vsto");
AddMapping(".vsw", "application/vnd.visio");
AddMapping(".vsx", "application/vnd.visio");
AddMapping(".vtx", "application/vnd.visio");
AddMapping(".wav", "audio/wav");
AddMapping(".wax", "audio/x-ms-wax");
AddMapping(".wbmp", "image/vnd.wap.wbmp");
AddMapping(".wcm", "application/vnd.ms-works");
AddMapping(".wdb", "application/vnd.ms-works");
AddMapping(".wks", "application/vnd.ms-works");
AddMapping(".wm", "video/x-ms-wm");
AddMapping(".wma", "audio/x-ms-wma");
AddMapping(".wmd", "application/x-ms-wmd");
AddMapping(".wmf", "application/x-msmetafile");
AddMapping(".wml", "text/vnd.wap.wml");
AddMapping(".wmlc", "application/vnd.wap.wmlc");
AddMapping(".wmls", "text/vnd.wap.wmlscript");
AddMapping(".wmlsc", "application/vnd.wap.wmlscriptc");
AddMapping(".wmp", "video/x-ms-wmp");
AddMapping(".wmv", "video/x-ms-wmv");
AddMapping(".wmx", "video/x-ms-wmx");
AddMapping(".wmz", "application/x-ms-wmz");
AddMapping(".wps", "application/vnd.ms-works");
AddMapping(".wri", "application/x-mswrite");
AddMapping(".wrl", "x-world/x-vrml");
AddMapping(".wrz", "x-world/x-vrml");
AddMapping(".wsdl", "text/xml");
AddMapping(".wvx", "video/x-ms-wvx");
AddMapping(".x", "application/directx");
AddMapping(".xaf", "x-world/x-vrml");
AddMapping(".xaml", "application/xaml+xml");
AddMapping(".xap", "application/x-silverlight-app");
AddMapping(".xbap", "application/x-ms-xbap");
AddMapping(".xbm", "image/x-xbitmap");
AddMapping(".xdr", "text/plain");
AddMapping(".xla", "application/vnd.ms-excel");
AddMapping(".xlam", "application/vnd.ms-excel.addin.macroEnabled.12");
AddMapping(".xlc", "application/vnd.ms-excel");
AddMapping(".xlm", "application/vnd.ms-excel");
AddMapping(".xls", "application/vnd.ms-excel");
AddMapping(".xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12");
AddMapping(".xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12");
AddMapping(".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
AddMapping(".xlt", "application/vnd.ms-excel");
AddMapping(".xltm", "application/vnd.ms-excel.template.macroEnabled.12");
AddMapping(".xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template");
AddMapping(".xlw", "application/vnd.ms-excel");
AddMapping(".xml", "text/xml");
AddMapping(".xof", "x-world/x-vrml");
AddMapping(".xpm", "image/x-xpixmap");
AddMapping(".xps", "application/vnd.ms-xpsdocument");
AddMapping(".xsd", "text/xml");
AddMapping(".xsf", "text/xml");
AddMapping(".xsl", "text/xml");
AddMapping(".xslt", "text/xml");
AddMapping(".xsn", "application/octet-stream");
AddMapping(".xtp", "application/octet-stream");
AddMapping(".xwd", "image/x-xwindowdump");
AddMapping(".z", "application/x-compress");
AddMapping(".zip", "application/x-zip-compressed");

 

 

감사합니다.