Scripto Example: Retrieve an asset-uploaded file

[#1]

This example shows how a file can be retrieved via Scripto and then displayed on a Web page. Precondition is that an asset has an uploaded file. This script assumes the file is there and that it is not extremely large (under 1 megabyte). This example uses base64 encoding to convert the file into a string. Future versions of Scripto will support other data streams so that base64 encoding will not be necessary.

import com.axeda.drm.sdk.Context
import com.axeda.drm.sdk.data.UploadedFile
import com.axeda.drm.sdk.data.UploadedFileFinder
import com.axeda.drm.sdk.device.Device
import com.axeda.drm.sdk.device.DeviceFinder
// This script requires parameter "id"
Context ctx = Context.create(parameters.username);
def response = ''
try {
    DeviceFinder deviceFinder = new DeviceFinder(ctx, new Identifier(parameters.id as Integer));
    Device device = deviceFinder.find();
    UploadedFileFinder uff = new UploadedFileFinder(ctx)
    uff.device = device
    uff.hint = 'photo'
    def ufiles = uff.findAll()
    UploadedFile ufile
    if (ufiles.size() > 0) {
        ufile = ufiles[0]
        File f = ufile.extractFile()
        response = getBytes(f).encodeBase64(false).toString()
    }
}
catch (Exception e) {
    logger.info(e.message);
    response = [
            faultcode: 'Groovy Exception',
            faultstring: e.message
    ];
}
return ['Content-Type': 'data:image/png;base64', 'Content': response];
static byte[] getBytes(File file) throws IOException {
    return getBytes(new FileInputStream(file));
}
static byte[] getBytes(InputStream is) throws IOException {
    ByteArrayOutputStream answer = new ByteArrayOutputStream();
// reading the content of the file within a byte buffer
    byte[] byteBuffer = new byte[8192];
    int nbByteRead /* = 0*/;
    try {
        while ((nbByteRead = is.read(byteBuffer)) != -1) {
// appends buffer
            answer.write(byteBuffer, 0, nbByteRead);
        }
    } finally {
        is.close()
    }
    return answer.toByteArray();
}