Download all attachments of a page as a ZIP file

Description

{{groovy}}
import java.util.zip.*

def targetDoc = xwiki.getDocument('Sandbox.WebHome')
def attachments = targetDoc.getAttachmentList()

if (attachments.size() > 0) {
    // Check if the user clicked the download link
    if (request.confirm == '1') {
        def response = xcontext.getResponse()
        response.setContentType("application/zip")
        response.setHeader("Content-Disposition", "attachment; filename=\"${targetDoc.name}_attachments.zip\"")

        def out = response.getOutputStream()
        def zipStream = new ZipOutputStream(out)

        attachments.each { attach ->
            def entry = new ZipEntry(attach.filename)
            zipStream.putNextEntry(entry)
            // Stream the attachment content into the ZIP
            attach.getContentInputStream().withStream { is ->
                zipStream << is
            }
            zipStream.closeEntry()
        }

        zipStream.close()
        xcontext.setFinished(true)
    } else {
        println "((("
        println "This page has **${attachments.size()}** attachment(s)."
        println "[[Download All as ZIP>>||queryString='confirm=1']]"
        println ")))"
        
        attachments.each { println "* ${it.filename}" }
    }
} else {
    println "{{warning}}No attachments found on this page.{{/warning}}"
}
{{/groovy}}