Cloudpods/backend/vendor/github.com/volcengine/ve-tos-golang-sdk/v2/tos/mime.go

package tos

import "path"

var mime = map[string]string{
	"3gp":      "video/3gpp",
	"7z":       "application/x-7z-compressed",
	"abw":      "application/x-abiword",
	"ai":       "application/postscript",
	"aif":      "audio/x-aiff",
	"aifc":     "audio/x-aiff",
	"aiff":     "audio/x-aiff",
	"alc":      "chemical/x-alchemy",
	"amr":      "audio/amr",
	"anx":      "application/annodex",
	"apk":      "application/vnd.android.package-archive",
	"appcache": "text/cache-manifest",
	"art":      "image/x-jg",
	"asc":      "text/plain",
	"asf":      "video/x-ms-asf",
	"aso":      "chemical/x-ncbi-asn1-binary",
	"asx":      "video/x-ms-asf",
	"atom":     "application/atom+xml",
	"atomcat":  "application/atomcat+xml",
	"atomsrv":  "application/atomserv+xml",
	"au":       "audio/basic",
	"avi":      "video/x-msvideo",
	"awb":      "audio/amr-wb",
	"axa":      "audio/annodex",
	"axv":      "video/annodex",
	"b":        "chemical/x-molconn-Z",
	"bak":      "application/x-trash",
	"bat":      "application/x-msdos-program",
	"bcpio":    "application/x-bcpio",
	"bib":      "text/x-bibtex",
	"bin":      "application/octet-stream",
	"bmp":      "image/x-ms-bmp",
	"boo":      "text/x-boo",
	"book":     "application/x-maker",
	"brf":      "text/plain",
	"bsd":      "chemical/x-crossfire",
	"c":        "text/x-csrc",
	"c++":      "text/x-c++src",
	"c3d":      "chemical/x-chem3d",
	"cab":      "application/x-cab",
	"cac":      "chemical/x-cache",
	"cache":    "chemical/x-cache",
	"cap":      "application/vnd.tcpdump.pcap",
	"cascii":   "chemical/x-cactvs-binary",
	"cat":      "application/vnd.ms-pki.seccat",
	"cbin":     "chemical/x-cactvs-binary",
	"cbr":      "application/x-cbr",
	"cbz":      "application/x-cbz",
	"cc":       "text/x-c++src",
	"cda":      "application/x-cdf",
	"cdf":      "application/x-cdf",
	"cdr":      "image/x-coreldraw",
	"cdt":      "image/x-coreldrawtemplate",
	"cdx":      "chemical/x-cdx",
	"cdy":      "application/vnd.cinderella",
	"cef":      "chemical/x-cxf",
	"cer":      "chemical/x-cerius",
	"chm":      "chemical/x-chemdraw",
	"chrt":     "application/x-kchart",
	"cif":      "chemical/x-cif",
	"class":    "application/java-vm",
	"cls":      "text/x-tex",
	"cmdf":     "chemical/x-cmdf",
	"cml":      "chemical/x-cml",
	"cod":      "application/vnd.rim.cod",
	"com":      "application/x-msdos-program",
	"cpa":      "chemical/x-compass",
	"cpio":     "application/x-cpio",
	"cpp":      "text/x-c++src",
	"cpt":      "application/mac-compactpro",
	"cr2":      "image/x-canon-cr2",
	"crl":      "application/x-pkcs7-crl",
	"crt":      "application/x-x509-ca-cert",
	"crw":      "image/x-canon-crw",
	"csd":      "audio/csound",
	"csf":      "chemical/x-cache-csf",
	"csh":      "application/x-csh",
	"csm":      "chemical/x-csml",
	"csml":     "chemical/x-csml",
	"css":      "text/css",
	"csv":      "text/csv",
	"ctab":     "chemical/x-cactvs-binary",
	"ctx":      "chemical/x-ctx",
	"cu":       "application/cu-seeme",
	"cub":      "chemical/x-gaussian-cube",
	"cxf":      "chemical/x-cxf",
	"cxx":      "text/x-c++src",
	"d":        "text/x-dsrc",
	"davmount": "application/davmount+xml",
	"dcm":      "application/dicom",
	"dcr":      "application/x-director",
	"ddeb":     "application/vnd.debian.binary-package",
	"dif":      "video/dv",
	"diff":     "text/x-diff",
	"dir":      "application/x-director",
	"djv":      "image/vnd.djvu",
	"djvu":     "image/vnd.djvu",
	"dl":       "video/dl",
	"dll":      "application/x-msdos-program",
	"dmg":      "application/x-apple-diskimage",
	"dms":      "application/x-dms",
	"doc":      "application/msword",
	"docm":     "application/vnd.ms-word.document.macroEnabled.12",
	"docx":     "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
	"dot":      "application/msword",
	"dotm":     "application/vnd.ms-word.template.macroEnabled.12",
	"dotx":     "application/vnd.openxmlformats-officedocument.wordprocessingml.template",
	"dv":       "video/dv",
	"dvi":      "application/x-dvi",
	"dx":       "chemical/x-jcamp-dx",
	"dxr":      "application/x-director",
	"emb":      "chemical/x-embl-dl-nucleotide",
	"embl":     "chemical/x-embl-dl-nucleotide",
	"eml":      "message/rfc822",
	"eot":      "application/vnd.ms-fontobject",
	"eps":      "application/postscript",
	"eps2":     "application/postscript",
	"eps3":     "application/postscript",
	"epsf":     "application/postscript",
	"epsi":     "application/postscript",
	"erf":      "image/x-epson-erf",
	"es":       "application/ecmascript",
	"etx":      "text/x-setext",
	"exe":      "application/x-msdos-program",
	"ez":       "application/andrew-inset",
	"fb":       "application/x-maker",
	"fbdoc":    "application/x-maker",
	"fch":      "chemical/x-gaussian-checkpoint",
	"fchk":     "chemical/x-gaussian-checkpoint",
	"fig":      "application/x-xfig",
	"flac":     "audio/flac",
	"fli":      "video/fli",
	"flv":      "video/x-flv",
	"fm":       "application/x-maker",
	"frame":    "application/x-maker",
	"frm":      "application/x-maker",
	"gal":      "chemical/x-gaussian-log",
	"gam":      "chemical/x-gamess-input",
	"gamin":    "chemical/x-gamess-input",
	"gan":      "application/x-ganttproject",
	"gau":      "chemical/x-gaussian-input",
	"gcd":      "text/x-pcs-gcd",
	"gcf":      "application/x-graphing-calculator",
	"gcg":      "chemical/x-gcg8-sequence",
	"gen":      "chemical/x-genbank",
	"gf":       "application/x-tex-gf",
	"gif":      "image/gif",
	"gjc":      "chemical/x-gaussian-input",
	"gjf":      "chemical/x-gaussian-input",
	"gl":       "video/gl",
	"gnumeric": "application/x-gnumeric",
	"gpt":      "chemical/x-mopac-graph",
	"gsf":      "application/x-font",
	"gsm":      "audio/x-gsm",
	"gtar":     "application/x-gtar",
	"gz":       "application/gzip",
	"h":        "text/x-chdr",
	"h++":      "text/x-c++hdr",
	"hdf":      "application/x-hdf",
	"hh":       "text/x-c++hdr",
	"hin":      "chemical/x-hin",
	"hpp":      "text/x-c++hdr",
	"hqx":      "application/mac-binhex40",
	"hs":       "text/x-haskell",
	"hta":      "application/hta",
	"htc":      "text/x-component",
	"htm":      "text/html",
	"html":     "text/html",
	"hwp":      "application/x-hwp",
	"hxx":      "text/x-c++hdr",
	"ica":      "application/x-ica",
	"ice":      "x-conference/x-cooltalk",
	"ico":      "image/vnd.microsoft.icon",
	"ics":      "text/calendar",
	"icz":      "text/calendar",
	"ief":      "image/ief",
	"iges":     "model/iges",
	"igs":      "model/iges",
	"iii":      "application/x-iphone",
	"info":     "application/x-info",
	"inp":      "chemical/x-gamess-input",
	"ins":      "application/x-internet-signup",
	"iso":      "application/x-iso9660-image",
	"isp":      "application/x-internet-signup",
	"ist":      "chemical/x-isostar",
	"istr":     "chemical/x-isostar",
	"jad":      "text/vnd.sun.j2me.app-descriptor",
	"jam":      "application/x-jam",
	"jar":      "application/java-archive",
	"java":     "text/x-java",
	"jdx":      "chemical/x-jcamp-dx",
	"jmz":      "application/x-jmol",
	"jng":      "image/x-jng",
	"jnlp":     "application/x-java-jnlp-file",
	"jp2":      "image/jp2",
	"jpe":      "image/jpeg",
	"jpeg":     "image/jpeg",
	"jpf":      "image/jpx",
	"jpg":      "image/jpeg",
	"jpg2":     "image/jp2",
	"jpm":      "image/jpm",
	"jpx":      "image/jpx",
	"js":       "application/javascript",
	"json":     "application/json",
	"kar":      "audio/midi",
	"key":      "application/pgp-keys",
	"kil":      "application/x-killustrator",
	"kin":      "chemical/x-kinemage",
	"kml":      "application/vnd.google-earth.kml+xml",
	"kmz":      "application/vnd.google-earth.kmz",
	"kpr":      "application/x-kpresenter",
	"kpt":      "application/x-kpresenter",
	"ksp":      "application/x-kspread",
	"kwd":      "application/x-kword",
	"kwt":      "application/x-kword",
	"latex":    "application/x-latex",
	"lha":      "application/x-lha",
	"lhs":      "text/x-literate-haskell",
	"lin":      "application/bbolin",
	"lsf":      "video/x-la-asf",
	"lsx":      "video/x-la-asf",
	"ltx":      "text/x-tex",
	"ly":       "text/x-lilypond",
	"lyx":      "application/x-lyx",
	"lzh":      "application/x-lzh",
	"lzx":      "application/x-lzx",
	"m3g":      "application/m3g",
	"m3u":      "audio/x-mpegurl",
	"m3u8":     "application/x-mpegURL",
	"m4a":      "audio/mpeg",
	"maker":    "application/x-maker",
	"man":      "application/x-troff-man",
	"mbox":     "application/mbox",
	"mcif":     "chemical/x-mmcif",
	"mcm":      "chemical/x-macmolecule",
	"mdb":      "application/msaccess",
	"me":       "application/x-troff-me",
	"mesh":     "model/mesh",
	"mid":      "audio/midi",
	"midi":     "audio/midi",
	"mif":      "application/x-mif",
	"mkv":      "video/x-matroska",
	"mm":       "application/x-freemind",
	"mmd":      "chemical/x-macromodel-input",
	"mmf":      "application/vnd.smaf",
	"mml":      "text/mathml",
	"mmod":     "chemical/x-macromodel-input",
	"mng":      "video/x-mng",
	"moc":      "text/x-moc",
	"mol":      "chemical/x-mdl-molfile",
	"mol2":     "chemical/x-mol2",
	"moo":      "chemical/x-mopac-out",
	"mop":      "chemical/x-mopac-input",
	"mopcrt":   "chemical/x-mopac-input",
	"mov":      "video/quicktime",
	"movie":    "video/x-sgi-movie",
	"mp2":      "audio/mpeg",
	"mp3":      "audio/mpeg",
	"mp4":      "video/mp4",
	"mpc":      "chemical/x-mopac-input",
	"mpe":      "video/mpeg",
	"mpeg":     "video/mpeg",
	"mpega":    "audio/mpeg",
	"mpg":      "video/mpeg",
	"mpga":     "audio/mpeg",
	"mph":      "application/x-comsol",
	"mpv":      "video/x-matroska",
	"ms":       "application/x-troff-ms",
	"msh":      "model/mesh",
	"msi":      "application/x-msi",
	"mvb":      "chemical/x-mopac-vib",
	"mxf":      "application/mxf",
	"mxu":      "video/vnd.mpegurl",
	"nb":       "application/mathematica",
	"nbp":      "application/mathematica",
	"nc":       "application/x-netcdf",
	"nef":      "image/x-nikon-nef",
	"nwc":      "application/x-nwc",
	"o":        "application/x-object",
	"oda":      "application/oda",
	"odb":      "application/vnd.oasis.opendocument.database",
	"odc":      "application/vnd.oasis.opendocument.chart",
	"odf":      "application/vnd.oasis.opendocument.formula",
	"odg":      "application/vnd.oasis.opendocument.graphics",
	"odi":      "application/vnd.oasis.opendocument.image",
	"odm":      "application/vnd.oasis.opendocument.text-master",
	"odp":      "application/vnd.oasis.opendocument.presentation",
	"ods":      "application/vnd.oasis.opendocument.spreadsheet",
	"odt":      "application/vnd.oasis.opendocument.text",
	"oga":      "audio/ogg",
	"ogg":      "audio/ogg",
	"ogv":      "video/ogg",
	"ogx":      "application/ogg",
	"old":      "application/x-trash",
	"one":      "application/onenote",
	"onepkg":   "application/onenote",
	"onetmp":   "application/onenote",
	"onetoc2":  "application/onenote",
	"opf":      "application/oebps-package+xml",
	"opus":     "audio/ogg",
	"orc":      "audio/csound",
	"orf":      "image/x-olympus-orf",
	"otf":      "application/font-sfnt",
	"otg":      "application/vnd.oasis.opendocument.graphics-template",
	"oth":      "application/vnd.oasis.opendocument.text-web",
	"otp":      "application/vnd.oasis.opendocument.presentation-template",
	"ots":      "application/vnd.oasis.opendocument.spreadsheet-template",
	"ott":      "application/vnd.oasis.opendocument.text-template",
	"oza":      "application/x-oz-application",
	"p":        "text/x-pascal",
	"p7r":      "application/x-pkcs7-certreqresp",
	"pac":      "application/x-ns-proxy-autoconfig",
	"pas":      "text/x-pascal",
	"pat":      "image/x-coreldrawpattern",
	"patch":    "text/x-diff",
	"pbm":      "image/x-portable-bitmap",
	"pcap":     "application/vnd.tcpdump.pcap",
	"pcf":      "application/x-font-pcf",
	"pcf.Z":    "application/x-font-pcf",
	"pcx":      "image/pcx",
	"pdb":      "chemical/x-pdb",
	"pdf":      "application/pdf",
	"pfa":      "application/x-font",
	"pfb":      "application/x-font",
	"pfr":      "application/font-tdpfr",
	"pgm":      "image/x-portable-graymap",
	"pgn":      "application/x-chess-pgn",
	"pgp":      "application/pgp-encrypted",
	"php":      "#application/x-httpd-php",
	"php3":     "#application/x-httpd-php3",
	"php3p":    "#application/x-httpd-php3-preprocessed",
	"php4":     "#application/x-httpd-php4",
	"php5":     "#application/x-httpd-php5",
	"phps":     "#application/x-httpd-php-source",
	"pht":      "#application/x-httpd-php",
	"phtml":    "#application/x-httpd-php",
	"pk":       "application/x-tex-pk",
	"pl":       "text/x-perl",
	"pls":      "audio/x-scpls",
	"pm":       "text/x-perl",
	"png":      "image/png",
	"pnm":      "image/x-portable-anymap",
	"pot":      "text/plain",
	"potm":     "application/vnd.ms-powerpoint.template.macroEnabled.12",
	"potx":     "application/vnd.openxmlformats-officedocument.presentationml.template",
	"ppam":     "application/vnd.ms-powerpoint.addin.macroEnabled.12",
	"ppm":      "image/x-portable-pixmap",
	"pps":      "application/vnd.ms-powerpoint",
	"ppsm":     "application/vnd.ms-powerpoint.slideshow.macroEnabled.12",
	"ppsx":     "application/vnd.openxmlformats-officedocument.presentationml.slideshow",
	"ppt":      "application/vnd.ms-powerpoint",
	"pptm":     "application/vnd.ms-powerpoint.presentation.macroEnabled.12",
	"pptx":     "application/vnd.openxmlformats-officedocument.presentationml.presentation",
	"prf":      "application/pics-rules",
	"prt":      "chemical/x-ncbi-asn1-ascii",
	"ps":       "application/postscript",
	"psd":      "image/x-photoshop",
	"py":       "text/x-python",
	"pyc":      "application/x-python-code",
	"pyo":      "application/x-python-code",
	"qgs":      "application/x-qgis",
	"qt":       "video/quicktime",
	"qtl":      "application/x-quicktimeplayer",
	"ra":       "audio/x-pn-realaudio",
	"ram":      "audio/x-pn-realaudio",
	"rar":      "application/rar",
	"ras":      "image/x-cmu-raster",
	"rb":       "application/x-ruby",
	"rd":       "chemical/x-mdl-rdfile",
	"rdf":      "application/rdf+xml",
	"rdp":      "application/x-rdp",
	"rgb":      "image/x-rgb",
	"rhtml":    "#application/x-httpd-eruby",
	"rm":       "audio/x-pn-realaudio",
	"roff":     "application/x-troff",
	"ros":      "chemical/x-rosdal",
	"rpm":      "application/x-redhat-package-manager",
	"rss":      "application/x-rss+xml",
	"rtf":      "application/rtf",
	"rtx":      "text/richtext",
	"rxn":      "chemical/x-mdl-rxnfile",
	"scala":    "text/x-scala",
	"sce":      "application/x-scilab",
	"sci":      "application/x-scilab",
	"sco":      "audio/csound",
	"scr":      "application/x-silverlight",
	"sct":      "text/scriptlet",
	"sd":       "chemical/x-mdl-sdfile",
	"sd2":      "audio/x-sd2",
	"sda":      "application/vnd.stardivision.draw",
	"sdc":      "application/vnd.stardivision.calc",
	"sdd":      "application/vnd.stardivision.impress",
	"sds":      "application/vnd.stardivision.chart",
	"sdw":      "application/vnd.stardivision.writer",
	"ser":      "application/java-serialized-object",
	"sfd":      "application/vnd.font-fontforge-sfd",
	"sfv":      "text/x-sfv",
	"sgf":      "application/x-go-sgf",
	"sgl":      "application/vnd.stardivision.writer-global",
	"sh":       "application/x-sh",
	"shar":     "application/x-shar",
	"shp":      "application/x-qgis",
	"shtml":    "text/html",
	"shx":      "application/x-qgis",
	"sid":      "audio/prs.sid",
	"sig":      "application/pgp-signature",
	"sik":      "application/x-trash",
	"silo":     "model/mesh",
	"sis":      "application/vnd.symbian.install",
	"sisx":     "x-epoc/x-sisx-app",
	"sit":      "application/x-stuffit",
	"sitx":     "application/x-stuffit",
	"skd":      "application/x-koan",
	"skm":      "application/x-koan",
	"skp":      "application/x-koan",
	"skt":      "application/x-koan",
	"sldm":     "application/vnd.ms-powerpoint.slide.macroEnabled.12",
	"sldx":     "application/vnd.openxmlformats-officedocument.presentationml.slide",
	"smi":      "application/smil+xml",
	"smil":     "application/smil+xml",
	"snd":      "audio/basic",
	"spc":      "chemical/x-galactic-spc",
	"spl":      "application/x-futuresplash",
	"spx":      "audio/ogg",
	"sql":      "application/x-sql",
	"src":      "application/x-wais-source",
	"srt":      "text/plain",
	"stc":      "application/vnd.sun.xml.calc.template",
	"std":      "application/vnd.sun.xml.draw.template",
	"sti":      "application/vnd.sun.xml.impress.template",
	"stw":      "application/vnd.sun.xml.writer.template",
	"sty":      "text/x-tex",
	"sv4cpio":  "application/x-sv4cpio",
	"sv4crc":   "application/x-sv4crc",
	"svg":      "image/svg+xml",
	"svgz":     "image/svg+xml",
	"sw":       "chemical/x-swissprot",
	"swf":      "application/x-shockwave-flash",
	"swfl":     "application/x-shockwave-flash",
	"sxc":      "application/vnd.sun.xml.calc",
	"sxd":      "application/vnd.sun.xml.draw",
	"sxg":      "application/vnd.sun.xml.writer.global",
	"sxi":      "application/vnd.sun.xml.impress",
	"sxm":      "application/vnd.sun.xml.math",
	"sxw":      "application/vnd.sun.xml.writer",
	"t":        "application/x-troff",
	"tar":      "application/x-tar",
	"taz":      "application/x-gtar-compressed",
	"tcl":      "application/x-tcl",
	"tex":      "text/x-tex",
	"texi":     "application/x-texinfo",
	"texinfo":  "application/x-texinfo",
	"text":     "text/plain",
	"tgf":      "chemical/x-mdl-tgf",
	"tgz":      "application/x-gtar-compressed",
	"thmx":     "application/vnd.ms-officetheme",
	"tif":      "image/tiff",
	"tiff":     "image/tiff",
	"tk":       "text/x-tcl",
	"tm":       "text/texmacs",
	"torrent":  "application/x-bittorrent",
	"tr":       "application/x-troff",
	"ts":       "video/MP2T",
	"tsp":      "application/dsptype",
	"tsv":      "text/tab-separated-values",
	"ttf":      "application/font-sfnt",
	"ttl":      "text/turtle",
	"txt":      "text/plain",
	"uls":      "text/iuls",
	"ustar":    "application/x-ustar",
	"val":      "chemical/x-ncbi-asn1-binary",
	"vcard":    "text/vcard",
	"vcd":      "application/x-cdlink",
	"vcf":      "text/vcard",
	"vcs":      "text/x-vcalendar",
	"vmd":      "chemical/x-vmd",
	"vms":      "chemical/x-vamas-iso14976",
	"vrm":      "x-world/x-vrml",
	"vrml":     "model/vrml",
	"vsd":      "application/vnd.visio",
	"vss":      "application/vnd.visio",
	"vst":      "application/vnd.visio",
	"vsw":      "application/vnd.visio",
	"wad":      "application/x-doom",
	"wasm":     "application/wasm",
	"wav":      "audio/x-wav",
	"wax":      "audio/x-ms-wax",
	"wbmp":     "image/vnd.wap.wbmp",
	"wbxml":    "application/vnd.wap.wbxml",
	"webm":     "video/webm",
	"wk":       "application/x-123",
	"wm":       "video/x-ms-wm",
	"wma":      "audio/x-ms-wma",
	"wmd":      "application/x-ms-wmd",
	"wml":      "text/vnd.wap.wml",
	"wmlc":     "application/vnd.wap.wmlc",
	"wmls":     "text/vnd.wap.wmlscript",
	"wmlsc":    "application/vnd.wap.wmlscriptc",
	"wmv":      "video/x-ms-wmv",
	"wmx":      "video/x-ms-wmx",
	"wmz":      "application/x-ms-wmz",
	"woff":     "application/font-woff",
	"wp5":      "application/vnd.wordperfect5.1",
	"wpd":      "application/vnd.wordperfect",
	"wrl":      "model/vrml",
	"wsc":      "text/scriptlet",
	"wvx":      "video/x-ms-wvx",
	"wz":       "application/x-wingz",
	"x3d":      "model/x3d+xml",
	"x3db":     "model/x3d+binary",
	"x3dv":     "model/x3d+vrml",
	"xbm":      "image/x-xbitmap",
	"xcf":      "application/x-xcf",
	"xcos":     "application/x-scilab-xcos",
	"xht":      "application/xhtml+xml",
	"xhtml":    "application/xhtml+xml",
	"xlam":     "application/vnd.ms-excel.addin.macroEnabled.12",
	"xlb":      "application/vnd.ms-excel",
	"xls":      "application/vnd.ms-excel",
	"xlsb":     "application/vnd.ms-excel.sheet.binary.macroEnabled.12",
	"xlsm":     "application/vnd.ms-excel.sheet.macroEnabled.12",
	"xlsx":     "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
	"xlt":      "application/vnd.ms-excel",
	"xltm":     "application/vnd.ms-excel.template.macroEnabled.12",
	"xltx":     "application/vnd.openxmlformats-officedocument.spreadsheetml.template",
	"xml":      "application/xml",
	"xpi":      "application/x-xpinstall",
	"xpm":      "image/x-xpixmap",
	"xsd":      "application/xml",
	"xsl":      "application/xslt+xml",
	"xslt":     "application/xslt+xml",
	"xspf":     "application/xspf+xml",
	"xtel":     "chemical/x-xtel",
	"xul":      "application/vnd.mozilla.xul+xml",
	"xwd":      "image/x-xwindowdump",
	"xyz":      "chemical/x-xyz",
	"xz":       "application/x-xz",
	"zip":      "application/zip",
}

type ContentTypeRecognizer interface {
	ContentType(objectKey string) string
}

type ExtensionBasedContentTypeRecognizer struct{}

func (er ExtensionBasedContentTypeRecognizer) ContentType(objectKey string) string {
	if len(objectKey) == 0 {
		return ""
	}
	extName := path.Ext(objectKey)
	if len(extName) > 0 && extName[0] == '.' {
		extName = extName[1:]
	}
	contentType, ok := mime[extName]
	if ok {
		return contentType
	}
	return "binary/octet-stream"
}

type EmptyContentTypeRecognizer struct{}

func (er EmptyContentTypeRecognizer) ContentType(objectKey string) string {
	_ = objectKey
	return ""
}