Static file servlet with Scalatra

mime.properties

ai  = application/postscript
aif	= audio/x-aiff
aifc	= audio/x-aiff
aiff	= audio/x-aiff
apk = application/vnd.android.package-archive
asc	= text/plain
asf     = video/x.ms.asf
asx     = video/x.ms.asx
au	= audio/basic
avi	= video/x-msvideo
bcpio	= application/x-bcpio
bin	= application/octet-stream
cab     = application/x-cabinet
cdf	= application/x-netcdf
class	= application/java-vm
cpio	= application/x-cpio
cpt	= application/mac-compactpro
crt	= application/x-x509-ca-cert
csh	= application/x-csh
css	= text/css
csv     = text/comma-separated-values
dcr	= application/x-director
dir	= application/x-director
dll     = application/x-msdownload
dms	= application/octet-stream
doc	= application/msword
dtd     = application/xml-dtd
dvi	= application/x-dvi
dxr	= application/x-director
eps	= application/postscript
etx	= text/x-setext
exe	= application/octet-stream
ez	= application/andrew-inset
gif	= image/gif
gtar	= application/x-gtar
gz	= application/gzip
gzip	= application/gzip
hdf	= application/x-hdf
hqx	= application/mac-binhex40
htc = text/x-component
htm	= text/html
html	= text/html
ice	= x-conference/x-cooltalk
ico	= image/x-icon
ief	= image/ief
iges	= model/iges
igs	= model/iges
jad     = text/vnd.sun.j2me.app-descriptor
jar     = application/java-archive
java	= text/plain
jnlp	= application/x-java-jnlp-file
jpe	= image/jpeg
jpeg	= image/jpeg
jpg	= image/jpeg
js	= application/x-javascript
jsp	= text/html
kar	= audio/midi
latex	= application/x-latex
lha	= application/octet-stream
lzh	= application/octet-stream
man	= application/x-troff-man
mathml	= application/mathml+xml
me	= application/x-troff-me
mesh	= model/mesh
mid	= audio/midi
midi	= audio/midi
mif	= application/vnd.mif
mol     = chemical/x-mdl-molfile
mov	= video/quicktime
movie	= video/x-sgi-movie
mp2	= audio/mpeg
mp3	= audio/mpeg
mpe	= video/mpeg
mpeg	= video/mpeg
mpg	= video/mpeg
mpga	= audio/mpeg
ms	= application/x-troff-ms
msh	= model/mesh
msi	= application/octet-stream
nc	= application/x-netcdf
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
ogg	= application/ogg
otc     = application/vnd.oasis.opendocument.chart-template
otf     = application/vnd.oasis.opendocument.formula-template
otg     = application/vnd.oasis.opendocument.graphics-template
oth     = application/vnd.oasis.opendocument.text-web
oti     = application/vnd.oasis.opendocument.image-template
otp     = application/vnd.oasis.opendocument.presentation-template
ots     = application/vnd.oasis.opendocument.spreadsheet-template
ott     = application/vnd.oasis.opendocument.text-template
pbm	= image/x-portable-bitmap
pdb	= chemical/x-pdb
pdf	= application/pdf
pgm	= image/x-portable-graymap
pgn	= application/x-chess-pgn
png	= image/png
pnm	= image/x-portable-anymap
ppm	= image/x-portable-pixmap
pps     = application/vnd.ms-powerpoint
ppt	= application/vnd.ms-powerpoint
ps	= application/postscript
qt	= video/quicktime
ra	= audio/x-pn-realaudio
ram	= audio/x-pn-realaudio
ras	= image/x-cmu-raster
rdf	= application/rdf+xml
rgb	= image/x-rgb
rm	= audio/x-pn-realaudio
roff	= application/x-troff
rpm	= application/x-rpm
rtf	= application/rtf
rtx	= text/richtext
rv      = video/vnd.rn-realvideo
ser     = application/java-serialized-object
sgm	= text/sgml
sgml	= text/sgml
sh	= application/x-sh
shar	= application/x-shar
silo	= model/mesh
sit	= application/x-stuffit
skd	= application/x-koan
skm	= application/x-koan
skp	= application/x-koan
skt	= application/x-koan
smi	= application/smil
smil	= application/smil
snd	= audio/basic
spl	= application/x-futuresplash
src	= application/x-wais-source
sv4cpio	= application/x-sv4cpio
sv4crc	= application/x-sv4crc
svg	= image/svg+xml
swf	= application/x-shockwave-flash
t	= application/x-troff
tar	= application/x-tar
tar.gz	= application/x-gtar
tcl	= application/x-tcl
tex	= application/x-tex
texi	= application/x-texinfo
texinfo	= application/x-texinfo
tgz	= application/x-gtar
tif	= image/tiff
tiff	= image/tiff
tr	= application/x-troff
tsv	= text/tab-separated-values
txt	= text/plain
ustar	= application/x-ustar
vcd	= application/x-cdlink
vrml	= model/vrml
vxml	= application/voicexml+xml
wav	= audio/x-wav
wbmp	= image/vnd.wap.wbmp
wml	= text/vnd.wap.wml
wmlc	= application/vnd.wap.wmlc
wmls	= text/vnd.wap.wmlscript
wmlsc	= application/vnd.wap.wmlscriptc
wrl	= model/vrml
wtls-ca-certificate	= application/vnd.wap.wtls-ca-certificate
xbm	= image/x-xbitmap
xht	= application/xhtml+xml
xhtml	= application/xhtml+xml
xls	= application/vnd.ms-excel
xml	= application/xml
xpm	= image/x-xpixmap
xsl	= application/xml
xslt	= application/xslt+xml
xul	= application/vnd.mozilla.xul+xml
xwd	= image/x-xwindowdump
xyz	= chemical/x-xyz
z	= application/compress
zip	= application/zip

StaticFileServlet.scala

package coolcode

import java.io.File
import java.util.Properties
import org.scalatra.ScalatraServlet

class StaticFileServlet extends ScalatraServlet {

  get("/*") {
    val resourcePath = "/WEB-INF" + getResourcePath
    Option(servletContext.getResourceAsStream(resourcePath)) match {
      case Some(inputStream) => {
        val staticFileContent = IOUtils.toByteArray(inputStream)
        contentType = StaticFileServlet.resolveContentType(resourcePath)
        staticFileContent
      }
      case None          => halt(404)
    }
  }

  private def getResourcePath =
    StringUtils.isEmpty(splatPath) match {
      case true  => request.getServletPath
      case false => request.getServletPath + "/" + splatPath
    }

  private def splatPath = multiParams("splat").head
}

object StaticFileServlet {
  private val properties: Properties = new Properties()
    properties.load(getClass().getResourceAsStream("/mime.properties"))

  def resolveContentType(resourcePath: String) = {
    val extension = properties.get(suffix(resourcePath))
    if (extension != null) extension.toString() else "text/plain"
  }
  
  private def suffix(path: String): String = path.reverse.takeWhile(_ != '.').reverse  
}