Question

Trying to pull an image off of Amazon S3 (returns S3ObjectInputStream) and send it to the mandrill email api (takes a base64-encoded string). How can this be done in Scala?

Answer 1

Here is one solution, there are probably others more efficient.

val is = new ByteArrayInputStream(Array[Byte](1, 2, 3)) // replace by your InputStream
val stream = Stream.continually(is.read).takeWhile(_ != -1).map(_.toByte)
val bytes = stream.toArray
val b64 = new sun.misc.BASE64Encoder().encode(bytes)

You could (and should) also replace the sun.misc encoder by the apache commons Base64 for a better compatibility.

val b64 = org.apache.commons.codec.binary.Base64.encodeBase64(bytes)