ipfs get: set correct content-type on resp

[rht]

closes #1824

[whyrusleeping]

mmm... i see you PRing against master... i'll allow this one though. fairly trivial.

LGTM

[jbenet]

maybe can make it something like:

if !xssSafeMimeType(mime) {
  mime = mimeTypes[cmds.Text]
}

and elsewhere something like:

var xssSafeMimeTypes = []string{
  mimeTypes[cmds.Tar],
  mimeTypes[cmds.GZip],
  mimeTypes[cmds.Text],
  mimeTypes[cmds.JSON],
}

func xssSafeMimeType(mime string) {
  for _, t := range xssSafeMimeTypes {
    if t == mime {
      return true
    }
  }
  return false
}

to make it clear why this is happening, and easier to broaden the safety boundary, in a single place.

this probably could be a separate package, and may already exist somewhere.

[rht]

No such package exists elsewhere yet.

[jbenet]

one comment above, otherwise LGTM

[whyrusleeping]

@rht update here?

[rht]

@rht doesn't have commit access