gziphttp/contenttype.go

package gziphttp

import (
	"fmt"
	"net/http"
	"path"
	"strings"
)

func SetContentTypeIfMedia(w http.ResponseWriter, r *http.Request) {
	ext := strings.ToLower(path.Ext(r.URL.Path))
	if i := strings.LastIndex(ext, "."); i != -1 {
		ext = ext[i:]
	}
	k := "Content-Type"
	v := ""
	switch ext {
	case ".mkv":
		v = "video/x-matroska"
	case ".epub", ".mobi":
		v = "application/epub+zip"
		k = "Content-Disposition"
		v = "attachment"
	case ".md":
		v = "text/markdown"
		v = "text/html"
	case ".ico":
		v = "image/x-icon"
	case ".pdf":
		w.Header().Set("Content-Disposition", fmt.Sprintf("inline; filename=%q", path.Base(r.URL.Path)))
		v = "application/pdf"
	case ".m4b":
		v = "application/octet-stream"
	case ".rss", ".feed", ".rdf":
		v = "application/rss+xml"

	case ".htm":
		v = "text/html; charset=utf-8"
	case ".html":
		v = "text/html; charset=utf-8"
	case ".jpeg":
		v = "image/jpeg"
	case ".jpg":
		v = "image/jpeg"
	case ".wasm":
		v = "application/wasm"
	case ".aac":
		v = "audio/aac"
	case ".abw":
		v = "application/x-abiword"
	case ".arc":
		v = "application/x-freearc"
	case ".avif":
		v = "image/avif"
	case ".avi":
		v = "video/x-msvideo"
	case ".azw":
		v = "application/vnd.amazon.ebook"
	case ".bin":
		v = "application/octet-stream"
	case ".bmp":
		v = "image/bmp"
	case ".bz":
		v = "application/x-bzip"
	case ".bz2":
		v = "application/x-bzip2"
	case ".cda":
		v = "application/x-cdf"
	case ".csh":
		v = "application/x-csh"
	case ".css":
		v = "text/css"
	case ".csv":
		v = "text/csv"
	case ".doc":
		v = "application/msword"
	case ".docx":
		v = "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
	case ".eot":
		v = "application/vnd.ms-fontobject"
	case ".gz":
		w.Header().Set("Content-Encoding", "gzip")
		v = "application/gzip"
		if strings.HasSuffix(r.URL.Path, ".js.gz") {
			v = "application/javascript"
		} else if strings.HasSuffix(r.URL.Path, ".wasm.gz") {
			v = "application/wasm"
		}
	case ".gif":
		v = "image/gif"
	case ".htm,":
		v = ".html text/html"
	case ".ics":
		v = "text/calendar"
	case ".jar":
		v = "application/java-archive"
	case ".jpeg,":
		v = ".jpg image/jpeg"
	case ".js":
		v = "text/javascript (Specifications: HTML and RFC 9239)"
	case ".json":
		v = "application/json"
	case ".jsonld":
		v = "application/ld+json"
	case ".mid,":
		v = ".midi audio/midi, audio/x-midi"
	case ".mjs":
		v = "text/javascript"
	case ".mp3":
		v = "audio/mpeg"
	case ".mp4":
		v = "video/mp4"
	case ".mpeg":
		v = "video/mpeg"
	case ".mpkg":
		v = "application/vnd.apple.installer+xml"
	case ".odp":
		v = "application/vnd.oasis.opendocument.presentation"
	case ".ods":
		v = "application/vnd.oasis.opendocument.spreadsheet"
	case ".odt":
		v = "application/vnd.oasis.opendocument.text"
	case ".oga":
		v = "audio/ogg"
	case ".ogv":
		v = "video/ogg"
	case ".ogx":
		v = "application/ogg"
	case ".opus":
		v = "audio/opus"
	case ".otf":
		v = "font/otf"
	case ".png":
		v = "image/png"
	case ".php":
		v = "application/x-httpd-php"
	case ".ppt":
		v = "application/vnd.ms-powerpoint"
	case ".pptx":
		v = "application/vnd.openxmlformats-officedocument.presentationml.presentation"
	case ".rar":
		v = "application/vnd.rar"
	case ".rtf":
		v = "application/rtf"
	case ".sh":
		v = "application/x-sh"
	case ".svg":
		v = "image/svg+xml"
	case ".tar":
		v = "application/x-tar"
	case ".tif,":
		v = ".tiff image/tiff"
	case ".ts":
		v = "video/mp2t"
	case ".ttf":
		v = "font/ttf"
	case ".txt":
		v = "text/plain"
	case ".vsd":
		v = "application/vnd.visio"
	case ".wav":
		v = "audio/wav"
	case ".weba":
		v = "audio/webm"
	case ".webm":
		v = "video/webm"
	case ".webp":
		v = "image/webp"
	case ".woff":
		v = "font/woff"
	case ".woff2":
		v = "font/woff2"
	case ".xhtml":
		v = "application/xhtml+xml"
	case ".xls":
		v = "application/vnd.ms-excel"
	case ".xlsx":
		v = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
	case ".xml":
		v = "application/xml"
	case ".xul":
		v = "application/vnd.mozilla.xul+xml"
	case ".zip":
		v = "application/zip"
	case ".3gp":
		v = "video/3gpp; audio/3gpp if it doesn't contain video"
	case ".3g2":
		v = "video/3gpp2; audio/3gpp2 if it doesn't contain video"
	case ".7z":
		v = "application/x-7z-compressed"
	default:
		return
	}
	w.Header().Set(k, v)
}