각종 MIME타입에 따라 다운로드시 헤더부에 Content-Type을 지정해줄 필요가 있습니다. 이때 파일확장자로부터 MIME타입을 얻어 다운로드시 헤더를 편집해주면 해당 파일은 지정된 MIME타입으로 다운로드 될수 있습니다.

[code]

<?php
/**
 * Mime class
 * @package utils
 * @since 1.0
 * @author swallow <*** 개인정보보호를 위한 이메일주소 노출방지 ***>
 * @copyright Copyright (c) 2017, EVENING
 */

class Mime
{

    /**
     * Detects MIME Type based on file extension.
     *
     * @param string $extension
     *
     * @return string|null MIME Type or NULL if no extension detected
     */
    public static function mimeByFileExtension($extension)
    {
        static $extensionToMimeTypeMap;

        if (! $extensionToMimeTypeMap) {
            $extensionToMimeTypeMap = self::mimeTypeMap();
        }

        if (isset($extensionToMimeTypeMap[$extension])) {
            return $extensionToMimeTypeMap[$extension];
        }

        return 'x-extension/' . $extension;
    }

    /**
     * @param string $filename
     *
     * @return string
     */
    public static function mimeByFilename($filename)
    {
        $extension = strtolower(pathinfo($filename, PATHINFO_EXTENSION));

        return empty($extension) ? 'application/octet-stream' : self::mimeByFileExtension($extension);
    }

    public static function mimeTypeMap()
    {
        return array(
            'ez' => 'application/andrew-inset',
            'aw' => 'application/applixware',
            'atom' => 'application/atom+xml',
            'atomcat' => 'application/atomcat+xml',
            'atomsvc' => 'application/atomsvc+xml',
            'bdoc' => 'application/bdoc',
            'ccxml' => 'application/ccxml+xml',
            'cdmia' => 'application/cdmi-capability',
            'cdmic' => 'application/cdmi-container',
            'cdmid' => 'application/cdmi-domain',
            'cdmio' => 'application/cdmi-object',
            'cdmiq' => 'application/cdmi-queue',
            'cu' => 'application/cu-seeme',
            'mpd' => 'application/dash+xml',
            'davmount' => 'application/davmount+xml',
            'dbk' => 'application/docbook+xml',
            'dssc' => 'application/dssc+der',
            'xdssc' => 'application/dssc+xml',
            'ecma' => 'application/ecmascript',
            'es' => 'application/ecmascript',
            'emma' => 'application/emma+xml',
            'epub' => 'application/epub+zip',
            'exi' => 'application/exi',
            'pfr' => 'application/font-tdpfr',
            'geojson' => 'application/geo+json',
            'gml' => 'application/gml+xml',
            'gpx' => 'application/gpx+xml',
            'gxf' => 'application/gxf',
            'gz' => 'application/gzip',
            'hjson' => 'application/hjson',
            'stk' => 'application/hyperstudio',
            'ink' => 'application/inkml+xml',
            'inkml' => 'application/inkml+xml',
            'ipfix' => 'application/ipfix',
            'jar' => 'application/java-archive',
            'war' => 'application/java-archive',
            'ear' => 'application/java-archive',
            'ser' => 'application/java-serialized-object',
            'class' => 'application/java-vm',
            'js' => 'application/javascript',
            'mjs' => 'application/javascript',
            'json' => 'application/json',
            'map' => 'application/json',
            'json5' => 'application/json5',
            'jsonml' => 'application/jsonml+json',
            'jsonld' => 'application/ld+json',
            'lostxml' => 'application/lost+xml',
            'hqx' => 'application/mac-binhex40',
            'cpt' => 'application/mac-compactpro',
            'mads' => 'application/mads+xml',
            'webmanifest' => 'application/manifest+json',
            'mrc' => 'application/marc',
            'mrcx' => 'application/marcxml+xml',
            'ma' => 'application/mathematica',
            'nb' => 'application/mathematica',
            'mb' => 'application/mathematica',
            'mathml' => 'application/mathml+xml',
            'mbox' => 'application/mbox',
            'mscml' => 'application/mediaservercontrol+xml',
            'metalink' => 'application/metalink+xml',
            'meta4' => 'application/metalink4+xml',
            'mets' => 'application/mets+xml',
            'mods' => 'application/mods+xml',
            'm21' => 'application/mp21',
            'mp21' => 'application/mp21',
            'mp4s' => 'application/mp4',
            'm4p' => 'application/mp4',
            'doc' => 'application/msword',
            'dot' => 'application/msword',
            'mxf' => 'application/mxf',
            'nq' => 'application/n-quads',
            'nt' => 'application/n-triples',
            'bin' => 'application/octet-stream',
            'dms' => 'application/octet-stream',
            'lrf' => 'application/octet-stream',
            'mar' => 'application/octet-stream',
            'so' => 'application/octet-stream',
            'dist' => 'application/octet-stream',
            'distz' => 'application/octet-stream',
            'pkg' => 'application/octet-stream',
            'bpk' => 'application/octet-stream',
            'dump' => 'application/octet-stream',
            'elc' => 'application/octet-stream',
            'deploy' => 'application/octet-stream',
            'exe' => 'application/octet-stream',
            'dll' => 'application/octet-stream',
            'deb' => 'application/octet-stream',
            'dmg' => 'application/octet-stream',
            'iso' => 'application/octet-stream',
            'img' => 'application/octet-stream',
            'msi' => 'application/octet-stream',
            'msp' => 'application/octet-stream',
            'msm' => 'application/octet-stream',
            'buffer' => 'application/octet-stream',
            'oda' => 'application/oda',
            'opf' => 'application/oebps-package+xml',
            'ogx' => 'application/ogg',
            'omdoc' => 'application/omdoc+xml',
            'onetoc' => 'application/onenote',
            'onetoc2' => 'application/onenote',
            'onetmp' => 'application/onenote',
            'onepkg' => 'application/onenote',
            'oxps' => 'application/oxps',
            'xer' => 'application/patch-ops-error+xml',
            'pdf' => 'application/pdf',
            'pgp' => 'application/pgp-encrypted',
            'asc' => 'application/pgp-signature',
            'sig' => 'application/pgp-signature',
            'prf' => 'application/pics-rules',
            'p10' => 'application/pkcs10',
            'p7m' => 'application/pkcs7-mime',
            'p7c' => 'application/pkcs7-mime',
            'p7s' => 'application/pkcs7-signature',
            'p8' => 'application/pkcs8',
            'ac' => 'application/pkix-attr-cert',
            'cer' => 'application/pkix-cert',
            'crl' => 'application/pkix-crl',
            'pkipath' => 'application/pkix-pkipath',
            'pki' => 'application/pkixcmp',
            'pls' => 'application/pls+xml',
            'ai' => 'application/postscript',
            'eps' => 'application/postscript',
            'ps' => 'application/postscript',
            'cww' => 'application/prs.cww',
            'pskcxml' => 'application/pskc+xml',
            'raml' => 'application/raml+yaml',
            'rdf' => 'application/rdf+xml',
            'owl' => 'application/rdf+xml',
            'rif' => 'application/reginfo+xml',
            'rnc' => 'application/relax-ng-compact-syntax',
            'rl' => 'application/resource-lists+xml',
            'rld' => 'application/resource-lists-diff+xml',
            'rs' => 'application/rls-services+xml',
            'gbr' => 'application/rpki-ghostbusters',
            'mft' => 'application/rpki-manifest',
            'roa' => 'application/rpki-roa',
            'rsd' => 'application/rsd+xml',
            'rss' => 'application/rss+xml',
            'rtf' => 'application/rtf',
            'sbml' => 'application/sbml+xml',
            'scq' => 'application/scvp-cv-request',
            'scs' => 'application/scvp-cv-response',
            'spq' => 'application/scvp-vp-request',
            'spp' => 'application/scvp-vp-response',
            'sdp' => 'application/sdp',
            'setpay' => 'application/set-payment-initiation',
            'setreg' => 'application/set-registration-initiation',
            'shf' => 'application/shf+xml',
            'siv' => 'application/sieve',
            'sieve' => 'application/sieve',
            'smi' => 'application/smil+xml',
            'smil' => 'application/smil+xml',
            'rq' => 'application/sparql-query',
            'srx' => 'application/sparql-results+xml',
            'gram' => 'application/srgs',
            'grxml' => 'application/srgs+xml',
            'sru' => 'application/sru+xml',
            'ssdl' => 'application/ssdl+xml',
            'ssml' => 'application/ssml+xml',
            'tei' => 'application/tei+xml',
            'teicorpus' => 'application/tei+xml',
            'tfi' => 'application/thraud+xml',
            'tsd' => 'application/timestamped-data',
            'plb' => 'application/vnd.3gpp.pic-bw-large',
            'psb' => 'application/vnd.3gpp.pic-bw-small',
            'pvb' => 'application/vnd.3gpp.pic-bw-var',
            'tcap' => 'application/vnd.3gpp2.tcap',
            'pwn' => 'application/vnd.3m.post-it-notes',
            'aso' => 'application/vnd.accpac.simply.aso',
            'imp' => 'application/vnd.accpac.simply.imp',
            'acu' => 'application/vnd.acucobol',
            'atc' => 'application/vnd.acucorp',
            'acutc' => 'application/vnd.acucorp',
            'air' => 'application/vnd.adobe.air-application-installer-package+zip',
            'fcdt' => 'application/vnd.adobe.formscentral.fcdt',
            'fxp' => 'application/vnd.adobe.fxp',
            'fxpl' => 'application/vnd.adobe.fxp',
            'xdp' => 'application/vnd.adobe.xdp+xml',
            'xfdf' => 'application/vnd.adobe.xfdf',
            'ahead' => 'application/vnd.ahead.space',
            'azf' => 'application/vnd.airzip.filesecure.azf',
            'azs' => 'application/vnd.airzip.filesecure.azs',
            'azw' => 'application/vnd.amazon.ebook',
            'acc' => 'application/vnd.americandynamics.acc',
            'ami' => 'application/vnd.amiga.ami',
            'apk' => 'application/vnd.android.package-archive',
            'cii' => 'application/vnd.anser-web-certificate-issue-initiation',
            'fti' => 'application/vnd.anser-web-funds-transfer-initiation',
            'atx' => 'application/vnd.antix.game-component',
            'mpkg' => 'application/vnd.apple.installer+xml',
            'keynote' => 'application/vnd.apple.keynote',
            'm3u8' => 'application/vnd.apple.mpegurl',
            'numbers' => 'application/vnd.apple.numbers',
            'pages' => 'application/vnd.apple.pages',
            'pkpass' => 'application/vnd.apple.pkpass',
            'swi' => 'application/vnd.aristanetworks.swi',
            'iota' => 'application/vnd.astraea-software.iota',
            'aep' => 'application/vnd.audiograph',
            'mpm' => 'application/vnd.blueice.multipass',
            'bmi' => 'application/vnd.bmi',
            'rep' => 'application/vnd.businessobjects',
            'cdxml' => 'application/vnd.chemdraw+xml',
            'mmd' => 'application/vnd.chipnuts.karaoke-mmd',
            'cdy' => 'application/vnd.cinderella',
            'csl' => 'application/vnd.citationstyles.style+xml',
            'cla' => 'application/vnd.claymore',
            'rp9' => 'application/vnd.cloanto.rp9',
            'c4g' => 'application/vnd.clonk.c4group',
            'c4d' => 'application/vnd.clonk.c4group',
            'c4f' => 'application/vnd.clonk.c4group',
            'c4p' => 'application/vnd.clonk.c4group',
            'c4u' => 'application/vnd.clonk.c4group',
            'c11amc' => 'application/vnd.cluetrust.cartomobile-config',
            'c11amz' => 'application/vnd.cluetrust.cartomobile-config-pkg',
            'csp' => 'application/vnd.commonspace',
            'cdbcmsg' => 'application/vnd.contact.cmsg',
            'cmc' => 'application/vnd.cosmocaller',
            'clkx' => 'application/vnd.crick.clicker',
            'clkk' => 'application/vnd.crick.clicker.keyboard',
            'clkp' => 'application/vnd.crick.clicker.palette',
            'clkt' => 'application/vnd.crick.clicker.template',
            'clkw' => 'application/vnd.crick.clicker.wordbank',
            'wbs' => 'application/vnd.criticaltools.wbs+xml',
            'pml' => 'application/vnd.ctc-posml',
            'ppd' => 'application/vnd.cups-ppd',
            'car' => 'application/vnd.curl.car',
            'pcurl' => 'application/vnd.curl.pcurl',
            'dart' => 'application/vnd.dart',
            'rdz' => 'application/vnd.data-vision.rdz',
            'uvf' => 'application/vnd.dece.data',
            'uvvf' => 'application/vnd.dece.data',
            'uvd' => 'application/vnd.dece.data',
            'uvvd' => 'application/vnd.dece.data',
            'uvt' => 'application/vnd.dece.ttml+xml',
            'uvvt' => 'application/vnd.dece.ttml+xml',
            'uvx' => 'application/vnd.dece.unspecified',
            'uvvx' => 'application/vnd.dece.unspecified',
            'uvz' => 'application/vnd.dece.zip',
            'uvvz' => 'application/vnd.dece.zip',
            'fe_launch' => 'application/vnd.denovo.fcselayout-link',
            'dna' => 'application/vnd.dna',
            'mlp' => 'application/vnd.dolby.mlp',
            'dpg' => 'application/vnd.dpgraph',
            'dfac' => 'application/vnd.dreamfactory',
            'kpxx' => 'application/vnd.ds-keypoint',
            'ait' => 'application/vnd.dvb.ait',
            'svc' => 'application/vnd.dvb.service',
            'geo' => 'application/vnd.dynageo',
            'mag' => 'application/vnd.ecowin.chart',
            'nml' => 'application/vnd.enliven',
            'esf' => 'application/vnd.epson.esf',
            'msf' => 'application/vnd.epson.msf',
            'qam' => 'application/vnd.epson.quickanime',
            'slt' => 'application/vnd.epson.salt',
            'ssf' => 'application/vnd.epson.ssf',
            'es3' => 'application/vnd.eszigno3+xml',
            'et3' => 'application/vnd.eszigno3+xml',
            'ez2' => 'application/vnd.ezpix-album',
            'ez3' => 'application/vnd.ezpix-package',
            'fdf' => 'application/vnd.fdf',
            'mseed' => 'application/vnd.fdsn.mseed',
            'seed' => 'application/vnd.fdsn.seed',
            'dataless' => 'application/vnd.fdsn.seed',
            'gph' => 'application/vnd.flographit',
            'ftc' => 'application/vnd.fluxtime.clip',
            'fm' => 'application/vnd.framemaker',
            'frame' => 'application/vnd.framemaker',
            'maker' => 'application/vnd.framemaker',
            'book' => 'application/vnd.framemaker',
            'fnc' => 'application/vnd.frogans.fnc',
            'ltf' => 'application/vnd.frogans.ltf',
            'fsc' => 'application/vnd.fsc.weblaunch',
            'oas' => 'application/vnd.fujitsu.oasys',
            'oa2' => 'application/vnd.fujitsu.oasys2',
            'oa3' => 'application/vnd.fujitsu.oasys3',
            'fg5' => 'application/vnd.fujitsu.oasysgp',
            'bh2' => 'application/vnd.fujitsu.oasysprs',
            'ddd' => 'application/vnd.fujixerox.ddd',
            'xdw' => 'application/vnd.fujixerox.docuworks',
            'xbd' => 'application/vnd.fujixerox.docuworks.binder',
            'fzs' => 'application/vnd.fuzzysheet',
            'txd' => 'application/vnd.genomatix.tuxedo',
            'ggb' => 'application/vnd.geogebra.file',
            'ggt' => 'application/vnd.geogebra.tool',
            'gex' => 'application/vnd.geometry-explorer',
            'gre' => 'application/vnd.geometry-explorer',
            'gxt' => 'application/vnd.geonext',
            'g2w' => 'application/vnd.geoplan',
            'g3w' => 'application/vnd.geospace',
            'gmx' => 'application/vnd.gmx',
            'gdoc' => 'application/vnd.google-apps.document',
            'gslides' => 'application/vnd.google-apps.presentation',
            'gsheet' => 'application/vnd.google-apps.spreadsheet',
            'kml' => 'application/vnd.google-earth.kml+xml',
            'kmz' => 'application/vnd.google-earth.kmz',
            'gqf' => 'application/vnd.grafeq',
            'gqs' => 'application/vnd.grafeq',
            'gac' => 'application/vnd.groove-account',
            'ghf' => 'application/vnd.groove-help',
            'gim' => 'application/vnd.groove-identity-message',
            'grv' => 'application/vnd.groove-injector',
            'gtm' => 'application/vnd.groove-tool-message',
            'tpl' => 'application/vnd.groove-tool-template',
            'vcg' => 'application/vnd.groove-vcard',
            'hal' => 'application/vnd.hal+xml',
            'zmm' => 'application/vnd.handheld-entertainment+xml',
            'hbci' => 'application/vnd.hbci',
            'les' => 'application/vnd.hhe.lesson-player',
            'hpgl' => 'application/vnd.hp-hpgl',
            'hpid' => 'application/vnd.hp-hpid',
            'hps' => 'application/vnd.hp-hps',
            'jlt' => 'application/vnd.hp-jlyt',
            'pcl' => 'application/vnd.hp-pcl',
            'pclxl' => 'application/vnd.hp-pclxl',
            'sfd-hdstx' => 'application/vnd.hydrostatix.sof-data',
            'mpy' => 'application/vnd.ibm.minipay',
            'afp' => 'application/vnd.ibm.modcap',
            'listafp' => 'application/vnd.ibm.modcap',
            'list3820' => 'application/vnd.ibm.modcap',
            'irm' => 'application/vnd.ibm.rights-management',
            'sc' => 'application/vnd.ibm.secure-container',
            'icc' => 'application/vnd.iccprofile',
            'icm' => 'application/vnd.iccprofile',
            'igl' => 'application/vnd.igloader',
            'ivp' => 'application/vnd.immervision-ivp',
            'ivu' => 'application/vnd.immervision-ivu',
            'igm' => 'application/vnd.insors.igm',
            'xpw' => 'application/vnd.intercon.formnet',
            'xpx' => 'application/vnd.intercon.formnet',
            'i2g' => 'application/vnd.intergeo',
            'qbo' => 'application/vnd.intu.qbo',
            'qfx' => 'application/vnd.intu.qfx',
            'rcprofile' => 'application/vnd.ipunplugged.rcprofile',
            'irp' => 'application/vnd.irepository.package+xml',
            'xpr' => 'application/vnd.is-xpr',
            'fcs' => 'application/vnd.isac.fcs',
            'jam' => 'application/vnd.jam',
            'rms' => 'application/vnd.jcp.javame.midlet-rms',
            'jisp' => 'application/vnd.jisp',
            'joda' => 'application/vnd.joost.joda-archive',
            'ktz' => 'application/vnd.kahootz',
            'ktr' => 'application/vnd.kahootz',
            'karbon' => 'application/vnd.kde.karbon',
            'chrt' => 'application/vnd.kde.kchart',
            'kfo' => 'application/vnd.kde.kformula',
            'flw' => 'application/vnd.kde.kivio',
            'kon' => 'application/vnd.kde.kontour',
            'kpr' => 'application/vnd.kde.kpresenter',
            'kpt' => 'application/vnd.kde.kpresenter',
            'ksp' => 'application/vnd.kde.kspread',
            'kwd' => 'application/vnd.kde.kword',
            'kwt' => 'application/vnd.kde.kword',
            'htke' => 'application/vnd.kenameaapp',
            'kia' => 'application/vnd.kidspiration',
            'kne' => 'application/vnd.kinar',
            'knp' => 'application/vnd.kinar',
            'skp' => 'application/vnd.koan',
            'skd' => 'application/vnd.koan',
            'skt' => 'application/vnd.koan',
            'skm' => 'application/vnd.koan',
            'sse' => 'application/vnd.kodak-descriptor',
            'lasxml' => 'application/vnd.las.las+xml',
            'lbd' => 'application/vnd.llamagraphics.life-balance.desktop',
            'lbe' => 'application/vnd.llamagraphics.life-balance.exchange+xml',
            '123' => 'application/vnd.lotus-1-2-3',
            'apr' => 'application/vnd.lotus-approach',
            'pre' => 'application/vnd.lotus-freelance',
            'nsf' => 'application/vnd.lotus-notes',
            'org' => 'application/vnd.lotus-organizer',
            'scm' => 'application/vnd.lotus-screencam',
            'lwp' => 'application/vnd.lotus-wordpro',
            'portpkg' => 'application/vnd.macports.portpkg',
            'mcd' => 'application/vnd.mcd',
            'mc1' => 'application/vnd.medcalcdata',
            'cdkey' => 'application/vnd.mediastation.cdkey',
            'mwf' => 'application/vnd.mfer',
            'mfm' => 'application/vnd.mfmp',
            'flo' => 'application/vnd.micrografx.flo',
            'igx' => 'application/vnd.micrografx.igx',
            'mif' => 'application/vnd.mif',
            'daf' => 'application/vnd.mobius.daf',
            'dis' => 'application/vnd.mobius.dis',
            'mbk' => 'application/vnd.mobius.mbk',
            'mqy' => 'application/vnd.mobius.mqy',
            'msl' => 'application/vnd.mobius.msl',
            'plc' => 'application/vnd.mobius.plc',
            'txf' => 'application/vnd.mobius.txf',
            'mpn' => 'application/vnd.mophun.application',
            'mpc' => 'application/vnd.mophun.certificate',
            'xul' => 'application/vnd.mozilla.xul+xml',
            'cil' => 'application/vnd.ms-artgalry',
            'cab' => 'application/vnd.ms-cab-compressed',
            'xls' => 'application/vnd.ms-excel',
            'xlm' => 'application/vnd.ms-excel',
            'xla' => 'application/vnd.ms-excel',
            'xlc' => 'application/vnd.ms-excel',
            'xlt' => 'application/vnd.ms-excel',
            'xlw' => 'application/vnd.ms-excel',
            'xlam' => 'application/vnd.ms-excel.addin.macroenabled.12',
            'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroenabled.12',
            'xlsm' => 'application/vnd.ms-excel.sheet.macroenabled.12',
            'xltm' => 'application/vnd.ms-excel.template.macroenabled.12',
            'eot' => 'application/vnd.ms-fontobject',
            'chm' => 'application/vnd.ms-htmlhelp',
            'ims' => 'application/vnd.ms-ims',
            'lrm' => 'application/vnd.ms-lrm',
            'thmx' => 'application/vnd.ms-officetheme',
            'msg' => 'application/vnd.ms-outlook',
            'cat' => 'application/vnd.ms-pki.seccat',
            'stl' => 'application/vnd.ms-pki.stl',
            'ppt' => 'application/vnd.ms-powerpoint',
            'pps' => 'application/vnd.ms-powerpoint',
            'pot' => 'application/vnd.ms-powerpoint',
            'ppam' => 'application/vnd.ms-powerpoint.addin.macroenabled.12',
            'pptm' => 'application/vnd.ms-powerpoint.presentation.macroenabled.12',
            'sldm' => 'application/vnd.ms-powerpoint.slide.macroenabled.12',
            'ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroenabled.12',
            'potm' => 'application/vnd.ms-powerpoint.template.macroenabled.12',
            'mpp' => 'application/vnd.ms-project',
            'mpt' => 'application/vnd.ms-project',
            'docm' => 'application/vnd.ms-word.document.macroenabled.12',
            'dotm' => 'application/vnd.ms-word.template.macroenabled.12',
            'wps' => 'application/vnd.ms-works',
            'wks' => 'application/vnd.ms-works',
            'wcm' => 'application/vnd.ms-works',
            'wdb' => 'application/vnd.ms-works',
            'wpl' => 'application/vnd.ms-wpl',
            'xps' => 'application/vnd.ms-xpsdocument',
            'mseq' => 'application/vnd.mseq',
            'mus' => 'application/vnd.musician',
            'msty' => 'application/vnd.muvee.style',
            'taglet' => 'application/vnd.mynfc',
            'nlu' => 'application/vnd.neurolanguage.nlu',
            'ntf' => 'application/vnd.nitf',
            'nitf' => 'application/vnd.nitf',
            'nnd' => 'application/vnd.noblenet-directory',
            'nns' => 'application/vnd.noblenet-sealer',
            'nnw' => 'application/vnd.noblenet-web',
            'ngdat' => 'application/vnd.nokia.n-gage.data',
            'n-gage' => 'application/vnd.nokia.n-gage.symbian.install',
            'rpst' => 'application/vnd.nokia.radio-preset',
            'rpss' => 'application/vnd.nokia.radio-presets',
            'edm' => 'application/vnd.novadigm.edm',
            'edx' => 'application/vnd.novadigm.edx',
            'ext' => 'application/vnd.novadigm.ext',
            'odc' => 'application/vnd.oasis.opendocument.chart',
            'otc' => 'application/vnd.oasis.opendocument.chart-template',
            'odb' => 'application/vnd.oasis.opendocument.database',
            'odf' => 'application/vnd.oasis.opendocument.formula',
            'odft' => 'application/vnd.oasis.opendocument.formula-template',
            'odg' => 'application/vnd.oasis.opendocument.graphics',
            'otg' => 'application/vnd.oasis.opendocument.graphics-template',
            'odi' => 'application/vnd.oasis.opendocument.image',
            'oti' => 'application/vnd.oasis.opendocument.image-template',
            'odp' => 'application/vnd.oasis.opendocument.presentation',
            'otp' => 'application/vnd.oasis.opendocument.presentation-template',
            'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
            'ots' => 'application/vnd.oasis.opendocument.spreadsheet-template',
            'odt' => 'application/vnd.oasis.opendocument.text',
            'odm' => 'application/vnd.oasis.opendocument.text-master',
            'ott' => 'application/vnd.oasis.opendocument.text-template',
            'oth' => 'application/vnd.oasis.opendocument.text-web',
            'xo' => 'application/vnd.olpc-sugar',
            'dd2' => 'application/vnd.oma.dd2+xml',
            'oxt' => 'application/vnd.openofficeorg.extension',
            'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
            'sldx' => 'application/vnd.openxmlformats-officedocument.presentationml.slide',
            'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
            'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
            'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
            'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
            'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
            'mgp' => 'application/vnd.osgeo.mapguide.package',
            'dp' => 'application/vnd.osgi.dp',
            'esa' => 'application/vnd.osgi.subsystem',
            'pdb' => 'application/vnd.palm',
            'pqa' => 'application/vnd.palm',
            'oprc' => 'application/vnd.palm',
            'paw' => 'application/vnd.pawaafile',
            'str' => 'application/vnd.pg.format',
            'ei6' => 'application/vnd.pg.osasli',
            'efif' => 'application/vnd.picsel',
            'wg' => 'application/vnd.pmi.widget',
            'plf' => 'application/vnd.pocketlearn',
            'pbd' => 'application/vnd.powerbuilder6',
            'box' => 'application/vnd.previewsystems.box',
            'mgz' => 'application/vnd.proteus.magazine',
            'qps' => 'application/vnd.publishare-delta-tree',
            'ptid' => 'application/vnd.pvi.ptid1',
            'qxd' => 'application/vnd.quark.quarkxpress',
            'qxt' => 'application/vnd.quark.quarkxpress',
            'qwd' => 'application/vnd.quark.quarkxpress',
            'qwt' => 'application/vnd.quark.quarkxpress',
            'qxl' => 'application/vnd.quark.quarkxpress',
            'qxb' => 'application/vnd.quark.quarkxpress',
            'bed' => 'application/vnd.realvnc.bed',
            'mxl' => 'application/vnd.recordare.musicxml',
            'musicxml' => 'application/vnd.recordare.musicxml+xml',
            'cryptonote' => 'application/vnd.rig.cryptonote',
            'cod' => 'application/vnd.rim.cod',
            'rm' => 'application/vnd.rn-realmedia',
            'rmvb' => 'application/vnd.rn-realmedia-vbr',
            'link66' => 'application/vnd.route66.link66+xml',
            'st' => 'application/vnd.sailingtracker.track',
            'see' => 'application/vnd.seemail',
            'sema' => 'application/vnd.sema',
            'semd' => 'application/vnd.semd',
            'semf' => 'application/vnd.semf',
            'ifm' => 'application/vnd.shana.informed.formdata',
            'itp' => 'application/vnd.shana.informed.formtemplate',
            'iif' => 'application/vnd.shana.informed.interchange',
            'ipk' => 'application/vnd.shana.informed.package',
            'twd' => 'application/vnd.simtech-mindmapper',
            'twds' => 'application/vnd.simtech-mindmapper',
            'mmf' => 'application/vnd.smaf',
            'teacher' => 'application/vnd.smart.teacher',
            'sdkm' => 'application/vnd.solent.sdkm+xml',
            'sdkd' => 'application/vnd.solent.sdkm+xml',
            'dxp' => 'application/vnd.spotfire.dxp',
            'sfs' => 'application/vnd.spotfire.sfs',
            'sdc' => 'application/vnd.stardivision.calc',
            'sda' => 'application/vnd.stardivision.draw',
            'sdd' => 'application/vnd.stardivision.impress',
            'smf' => 'application/vnd.stardivision.math',
            'sdw' => 'application/vnd.stardivision.writer',
            'vor' => 'application/vnd.stardivision.writer',
            'sgl' => 'application/vnd.stardivision.writer-global',
            'smzip' => 'application/vnd.stepmania.package',
            'sm' => 'application/vnd.stepmania.stepchart',
            'wadl' => 'application/vnd.sun.wadl+xml',
            'sxc' => 'application/vnd.sun.xml.calc',
            'stc' => 'application/vnd.sun.xml.calc.template',
            'sxd' => 'application/vnd.sun.xml.draw',
            'std' => 'application/vnd.sun.xml.draw.template',
            'sxi' => 'application/vnd.sun.xml.impress',
            'sti' => 'application/vnd.sun.xml.impress.template',
            'sxm' => 'application/vnd.sun.xml.math',
            'sxw' => 'application/vnd.sun.xml.writer',
            'sxg' => 'application/vnd.sun.xml.writer.global',
            'stw' => 'application/vnd.sun.xml.writer.template',
            'sus' => 'application/vnd.sus-calendar',
            'susp' => 'application/vnd.sus-calendar',
            'svd' => 'application/vnd.svd',
            'sis' => 'application/vnd.symbian.install',
            'sisx' => 'application/vnd.symbian.install',
            'xsm' => 'application/vnd.syncml+xml',
            'bdm' => 'application/vnd.syncml.dm+wbxml',
            'xdm' => 'application/vnd.syncml.dm+xml',
            'tao' => 'application/vnd.tao.intent-module-archive',
            'pcap' => 'application/vnd.tcpdump.pcap',
            'cap' => 'application/vnd.tcpdump.pcap',
            'dmp' => 'application/vnd.tcpdump.pcap',
            'tmo' => 'application/vnd.tmobile-livetv',
            'tpt' => 'application/vnd.trid.tpt',
            'mxs' => 'application/vnd.triscape.mxs',
            'tra' => 'application/vnd.trueapp',
            'ufd' => 'application/vnd.ufdl',
            'ufdl' => 'application/vnd.ufdl',
            'utz' => 'application/vnd.uiq.theme',
            'umj' => 'application/vnd.umajin',
            'unityweb' => 'application/vnd.unity',
            'uoml' => 'application/vnd.uoml+xml',
            'vcx' => 'application/vnd.vcx',
            'vsd' => 'application/vnd.visio',
            'vst' => 'application/vnd.visio',
            'vss' => 'application/vnd.visio',
            'vsw' => 'application/vnd.visio',
            'vis' => 'application/vnd.visionary',
            'vsf' => 'application/vnd.vsf',
            'wbxml' => 'application/vnd.wap.wbxml',
            'wmlc' => 'application/vnd.wap.wmlc',
            'wmlsc' => 'application/vnd.wap.wmlscriptc',
            'wtb' => 'application/vnd.webturbo',
            'nbp' => 'application/vnd.wolfram.player',
            'wpd' => 'application/vnd.wordperfect',
            'wqd' => 'application/vnd.wqd',
            'stf' => 'application/vnd.wt.stf',
            'xar' => 'application/vnd.xara',
            'xfdl' => 'application/vnd.xfdl',
            'hvd' => 'application/vnd.yamaha.hv-dic',
            'hvs' => 'application/vnd.yamaha.hv-script',
            'hvp' => 'application/vnd.yamaha.hv-voice',
            'osf' => 'application/vnd.yamaha.openscoreformat',
            'osfpvg' => 'application/vnd.yamaha.openscoreformat.osfpvg+xml',
            'saf' => 'application/vnd.yamaha.smaf-audio',
            'spf' => 'application/vnd.yamaha.smaf-phrase',
            'cmp' => 'application/vnd.yellowriver-custom-menu',
            'zir' => 'application/vnd.zul',
            'zirz' => 'application/vnd.zul',
            'zaz' => 'application/vnd.zzazz.deck+xml',
            'vxml' => 'application/voicexml+xml',
            'wasm' => 'application/wasm',
            'wgt' => 'application/widget',
            'hlp' => 'application/winhlp',
            'wsdl' => 'application/wsdl+xml',
            'wspolicy' => 'application/wspolicy+xml',
            '7z' => 'application/x-7z-compressed',
            'abw' => 'application/x-abiword',
            'ace' => 'application/x-ace-compressed',
            'dmg' => 'application/x-apple-diskimage',
            'arj' => 'application/x-arj',
            'aab' => 'application/x-authorware-bin',
            'x32' => 'application/x-authorware-bin',
            'u32' => 'application/x-authorware-bin',
            'vox' => 'application/x-authorware-bin',
            'aam' => 'application/x-authorware-map',
            'aas' => 'application/x-authorware-seg',
            'bcpio' => 'application/x-bcpio',
            'bdoc' => 'application/x-bdoc',
            'torrent' => 'application/x-bittorrent',
            'blb' => 'application/x-blorb',
            'blorb' => 'application/x-blorb',
            'bz' => 'application/x-bzip',
            'bz2' => 'application/x-bzip2',
            'boz' => 'application/x-bzip2',
            'cbr' => 'application/x-cbr',
            'cba' => 'application/x-cbr',
            'cbt' => 'application/x-cbr',
            'cbz' => 'application/x-cbr',
            'cb7' => 'application/x-cbr',
            'vcd' => 'application/x-cdlink',
            'cfs' => 'application/x-cfs-compressed',
            'chat' => 'application/x-chat',
            'pgn' => 'application/x-chess-pgn',
            'crx' => 'application/x-chrome-extension',
            'cco' => 'application/x-cocoa',
            'nsc' => 'application/x-conference',
            'cpio' => 'application/x-cpio',
            'csh' => 'application/x-csh',
            'deb' => 'application/x-debian-package',
            'udeb' => 'application/x-debian-package',
            'dgc' => 'application/x-dgc-compressed',
            'dir' => 'application/x-director',
            'dcr' => 'application/x-director',
            'dxr' => 'application/x-director',
            'cst' => 'application/x-director',
            'cct' => 'application/x-director',
            'cxt' => 'application/x-director',
            'w3d' => 'application/x-director',
            'fgd' => 'application/x-director',
            'swa' => 'application/x-director',
            'wad' => 'application/x-doom',
            'ncx' => 'application/x-dtbncx+xml',
            'dtb' => 'application/x-dtbook+xml',
            'res' => 'application/x-dtbresource+xml',
            'dvi' => 'application/x-dvi',
            'evy' => 'application/x-envoy',
            'eva' => 'application/x-eva',
            'bdf' => 'application/x-font-bdf',
            'gsf' => 'application/x-font-ghostscript',
            'psf' => 'application/x-font-linux-psf',
            'pcf' => 'application/x-font-pcf',
            'snf' => 'application/x-font-snf',
            'pfa' => 'application/x-font-type1',
            'pfb' => 'application/x-font-type1',
            'pfm' => 'application/x-font-type1',
            'afm' => 'application/x-font-type1',
            'arc' => 'application/x-freearc',
            'spl' => 'application/x-futuresplash',
            'gca' => 'application/x-gca-compressed',
            'ulx' => 'application/x-glulx',
            'gnumeric' => 'application/x-gnumeric',
            'gramps' => 'application/x-gramps-xml',
            'gtar' => 'application/x-gtar',
            'hdf' => 'application/x-hdf',
            'php' => 'application/x-httpd-php',
            'install' => 'application/x-install-instructions',
            'iso' => 'application/x-iso9660-image',
            'jardiff' => 'application/x-java-archive-diff',
            'jnlp' => 'application/x-java-jnlp-file',
            'latex' => 'application/x-latex',
            'luac' => 'application/x-lua-bytecode',
            'lzh' => 'application/x-lzh-compressed',
            'lha' => 'application/x-lzh-compressed',
            'run' => 'application/x-makeself',
            'mie' => 'application/x-mie',
            'prc' => 'application/x-mobipocket-ebook',
            'mobi' => 'application/x-mobipocket-ebook',
            'application' => 'application/x-ms-application',
            'lnk' => 'application/x-ms-shortcut',
            'wmd' => 'application/x-ms-wmd',
            'wmz' => 'application/x-ms-wmz',
            'xbap' => 'application/x-ms-xbap',
            'mdb' => 'application/x-msaccess',
            'obd' => 'application/x-msbinder',
            'crd' => 'application/x-mscardfile',
            'clp' => 'application/x-msclip',
            'exe' => 'application/x-msdos-program',
            'exe' => 'application/x-msdownload',
            'dll' => 'application/x-msdownload',
            'com' => 'application/x-msdownload',
            'bat' => 'application/x-msdownload',
            'msi' => 'application/x-msdownload',
            'mvb' => 'application/x-msmediaview',
            'm13' => 'application/x-msmediaview',
            'm14' => 'application/x-msmediaview',
            'wmf' => 'application/x-msmetafile',
            'wmz' => 'application/x-msmetafile',
            'emf' => 'application/x-msmetafile',
            'emz' => 'application/x-msmetafile',
            'mny' => 'application/x-msmoney',
            'pub' => 'application/x-mspublisher',
            'scd' => 'application/x-msschedule',
            'trm' => 'application/x-msterminal',
            'wri' => 'application/x-mswrite',
            'nc' => 'application/x-netcdf',
            'cdf' => 'application/x-netcdf',
            'pac' => 'application/x-ns-proxy-autoconfig',
            'nzb' => 'application/x-nzb',
            'pl' => 'application/x-perl',
            'pm' => 'application/x-perl',
            'prc' => 'application/x-pilot',
            'pdb' => 'application/x-pilot',
            'p12' => 'application/x-pkcs12',
            'pfx' => 'application/x-pkcs12',
            'p7b' => 'application/x-pkcs7-certificates',
            'spc' => 'application/x-pkcs7-certificates',
            'p7r' => 'application/x-pkcs7-certreqresp',
            'rar' => 'application/x-rar-compressed',
            'rpm' => 'application/x-redhat-package-manager',
            'ris' => 'application/x-research-info-systems',
            'sea' => 'application/x-sea',
            'sh' => 'application/x-sh',
            'shar' => 'application/x-shar',
            'swf' => 'application/x-shockwave-flash',
            'xap' => 'application/x-silverlight-app',
            'sql' => 'application/x-sql',
            'sit' => 'application/x-stuffit',
            'sitx' => 'application/x-stuffitx',
            'srt' => 'application/x-subrip',
            'sv4cpio' => 'application/x-sv4cpio',
            'sv4crc' => 'application/x-sv4crc',
            't3' => 'application/x-t3vm-image',
            'gam' => 'application/x-tads',
            'tar' => 'application/x-tar',
            'tcl' => 'application/x-tcl',
            'tk' => 'application/x-tcl',
            'tex' => 'application/x-tex',
            'tfm' => 'application/x-tex-tfm',
            'texinfo' => 'application/x-texinfo',
            'texi' => 'application/x-texinfo',
            'obj' => 'application/x-tgif',
            'ustar' => 'application/x-ustar',
            'hdd' => 'application/x-virtualbox-hdd',
            'ova' => 'application/x-virtualbox-ova',
            'ovf' => 'application/x-virtualbox-ovf',
            'vbox' => 'application/x-virtualbox-vbox',
            'vbox-extpack' => 'application/x-virtualbox-vbox-extpack',
            'vdi' => 'application/x-virtualbox-vdi',
            'vhd' => 'application/x-virtualbox-vhd',
            'vmdk' => 'application/x-virtualbox-vmdk',
            'src' => 'application/x-wais-source',
            'webapp' => 'application/x-web-app-manifest+json',
            'der' => 'application/x-x509-ca-cert',
            'crt' => 'application/x-x509-ca-cert',
            'pem' => 'application/x-x509-ca-cert',
            'fig' => 'application/x-xfig',
            'xlf' => 'application/x-xliff+xml',
            'xpi' => 'application/x-xpinstall',
            'xz' => 'application/x-xz',
            'z1' => 'application/x-zmachine',
            'z2' => 'application/x-zmachine',
            'z3' => 'application/x-zmachine',
            'z4' => 'application/x-zmachine',
            'z5' => 'application/x-zmachine',
            'z6' => 'application/x-zmachine',
            'z7' => 'application/x-zmachine',
            'z8' => 'application/x-zmachine',
            'xaml' => 'application/xaml+xml',
            'xdf' => 'application/xcap-diff+xml',
            'xenc' => 'application/xenc+xml',
            'xhtml' => 'application/xhtml+xml',
            'xht' => 'application/xhtml+xml',
            'xml' => 'application/xml',
            'xsl' => 'application/xml',
            'xsd' => 'application/xml',
            'rng' => 'application/xml',
            'dtd' => 'application/xml-dtd',
            'xop' => 'application/xop+xml',
            'xpl' => 'application/xproc+xml',
            'xslt' => 'application/xslt+xml',
            'xspf' => 'application/xspf+xml',
            'mxml' => 'application/xv+xml',
            'xhvml' => 'application/xv+xml',
            'xvml' => 'application/xv+xml',
            'xvm' => 'application/xv+xml',
            'yang' => 'application/yang',
            'yin' => 'application/yin+xml',
            'zip' => 'application/zip',
            '3gpp' => 'audio/3gpp',
            'adp' => 'audio/adpcm',
            'au' => 'audio/basic',
            'snd' => 'audio/basic',
            'mid' => 'audio/midi',
            'midi' => 'audio/midi',
            'kar' => 'audio/midi',
            'rmi' => 'audio/midi',
            'mp3' => 'audio/mp3',
            'm4a' => 'audio/mp4',
            'mp4a' => 'audio/mp4',
            'mpga' => 'audio/mpeg',
            'mp2' => 'audio/mpeg',
            'mp2a' => 'audio/mpeg',
            'mp3' => 'audio/mpeg',
            'm2a' => 'audio/mpeg',
            'm3a' => 'audio/mpeg',
            'oga' => 'audio/ogg',
            'ogg' => 'audio/ogg',
            'spx' => 'audio/ogg',
            's3m' => 'audio/s3m',
            'sil' => 'audio/silk',
            'uva' => 'audio/vnd.dece.audio',
            'uvva' => 'audio/vnd.dece.audio',
            'eol' => 'audio/vnd.digital-winds',
            'dra' => 'audio/vnd.dra',
            'dts' => 'audio/vnd.dts',
            'dtshd' => 'audio/vnd.dts.hd',
            'lvp' => 'audio/vnd.lucent.voice',
            'pya' => 'audio/vnd.ms-playready.media.pya',
            'ecelp4800' => 'audio/vnd.nuera.ecelp4800',
            'ecelp7470' => 'audio/vnd.nuera.ecelp7470',
            'ecelp9600' => 'audio/vnd.nuera.ecelp9600',
            'rip' => 'audio/vnd.rip',
            'wav' => 'audio/wav',
            'wav' => 'audio/wave',
            'weba' => 'audio/webm',
            'aac' => 'audio/x-aac',
            'aif' => 'audio/x-aiff',
            'aiff' => 'audio/x-aiff',
            'aifc' => 'audio/x-aiff',
            'caf' => 'audio/x-caf',
            'flac' => 'audio/x-flac',
            'm4a' => 'audio/x-m4a',
            'mka' => 'audio/x-matroska',
            'm3u' => 'audio/x-mpegurl',
            'wax' => 'audio/x-ms-wax',
            'wma' => 'audio/x-ms-wma',
            'ram' => 'audio/x-pn-realaudio',
            'ra' => 'audio/x-pn-realaudio',
            'rmp' => 'audio/x-pn-realaudio-plugin',
            'ra' => 'audio/x-realaudio',
            'wav' => 'audio/x-wav',
            'xm' => 'audio/xm',
            'cdx' => 'chemical/x-cdx',
            'cif' => 'chemical/x-cif',
            'cmdf' => 'chemical/x-cmdf',
            'cml' => 'chemical/x-cml',
            'csml' => 'chemical/x-csml',
            'xyz' => 'chemical/x-xyz',
            'ttc' => 'font/collection',
            'otf' => 'font/otf',
            'ttf' => 'font/ttf',
            'woff' => 'font/woff',
            'woff2' => 'font/woff2',
            'exr' => 'image/aces',
            'apng' => 'image/apng',
            'bmp' => 'image/bmp',
            'cgm' => 'image/cgm',
            'drle' => 'image/dicom-rle',
            'emf' => 'image/emf',
            'fits' => 'image/fits',
            'g3' => 'image/g3fax',
            'gif' => 'image/gif',
            'heic' => 'image/heic',
            'heics' => 'image/heic-sequence',
            'heif' => 'image/heif',
            'heifs' => 'image/heif-sequence',
            'hej2' => 'image/hej2k',
            'hsj2' => 'image/hsj2',
            'ief' => 'image/ief',
            'jls' => 'image/jls',
            'jp2' => 'image/jp2',
            'jpg2' => 'image/jp2',
            'jpeg' => 'image/jpeg',
            'jpg' => 'image/jpeg',
            'jpe' => 'image/jpeg',
            'jph' => 'image/jph',
            'jhc' => 'image/jphc',
            'jpm' => 'image/jpm',
            'jpx' => 'image/jpx',
            'jpf' => 'image/jpx',
            'jxr' => 'image/jxr',
            'jxra' => 'image/jxra',
            'jxrs' => 'image/jxrs',
            'jxsi' => 'image/jxsi',
            'jxss' => 'image/jxss',
            'ktx' => 'image/ktx',
            'png' => 'image/png',
            'btif' => 'image/prs.btif',
            'pti' => 'image/prs.pti',
            'sgi' => 'image/sgi',
            'svg' => 'image/svg+xml',
            'svgz' => 'image/svg+xml',
            't38' => 'image/t38',
            'tif' => 'image/tiff',
            'tiff' => 'image/tiff',
            'tfx' => 'image/tiff-fx',
            'psd' => 'image/vnd.adobe.photoshop',
            'azv' => 'image/vnd.airzip.accelerator.azv',
            'uvi' => 'image/vnd.dece.graphic',
            'uvvi' => 'image/vnd.dece.graphic',
            'uvg' => 'image/vnd.dece.graphic',
            'uvvg' => 'image/vnd.dece.graphic',
            'djvu' => 'image/vnd.djvu',
            'djv' => 'image/vnd.djvu',
            'sub' =>