Unzip input payload for SAP CPI, even form-data MIME

rsugio-unzip1.groovy

// import commons-fileupload-1.4.jar into your CPI resources

import com.sap.gateway.ip.core.customdev.util.Message as CpiMsg
import javax.activation.DataHandler
import org.apache.commons.fileupload.MultipartStream
import org.apache.commons.io.IOUtils
import javax.mail.internet.*
import java.util.zip.*

/**
 * [email protected]
 * 2020-03-25
 * 
 **/

CpiMsg unzip1(CpiMsg msg) {
    def mpl = messageLogFactory.getMessageLog(msg)
    Map<String,DataHandler> atts = msg.attachments
    def log = "Body content-type is ${msg.headers.'Content-Type'} and content-length is ${msg.headers.'Content-Length'}\n" << "Message attachments qty: ${atts.size()}\n"
    
    atts.each{String k, DataHandler v ->
        log << "Attachment $k content-type ${v.contentType}\n"
    }

    int cl = msg.headers."Conent-Length" ? (msg.headers."Conent-Length" as int) : 65536

    final ContentType ct = new ContentType(msg.headers.'Content-Type')
    final String CD = "Content-Disposition: "
    if (ct.primaryType=="multipart" && ct.subType=="form-data") {
        final byte[] boundary = ct.getParameter("boundary").getBytes()

        final MultipartStream multipartStream = new MultipartStream(msg.getBody(InputStream), boundary)
    
        boolean nextPart = multipartStream.skipPreamble()
        while (nextPart) {
            boolean zip = false
            String[] headers = multipartStream.readHeaders().split("\\r\\n")
            ContentDisposition cd = null
            for (String h: headers) {
                if (h.startsWith(CD)) {
                    cd = new ContentDisposition(h.substring(CD.length()))
                    zip = zip || cd.getParameter("filename").endsWith(".zip")
                }
            }
            if (zip) {
                log << cd.getParameter("filename") << "\n"
                ByteArrayOutputStream bos = new ByteArrayOutputStream(1024)
                multipartStream.readBodyData(bos)
                bos.close()
                ByteArrayInputStream bis2 = new ByteArrayInputStream(bos.toByteArray())
                ZipInputStream zis = new ZipInputStream(bis2)
                ZipEntry ze = zis.getNextEntry()
                while (ze!=null) {
                    log << "\t" << ze.getName() << "\n"
                    ze = zis.getNextEntry()
                }
                zis.close()
            }
            
            log << "\n"
            nextPart = multipartStream.readBoundary()
        }
    }
    if (ct.primaryType=="application" && ct.subType=="zip") {
        log << ct.getParameter("filename") << "\n"
        ZipInputStream zis = new ZipInputStream(msg.getBody(InputStream))
        ZipEntry ze = zis.getNextEntry()
        while (ze!=null) {
            log << ze.getName() << "\n"
            ze = zis.getNextEntry()
        }
        zis.close()
    }

    msg.setBody(log as String)
    msg
}

Demo1 for form-data Content-Type:
Body content-type is multipart/form-data; boundary=--------------------------604670599132136208173838 and content-length is 3114794
Message attachments qty: 0
HCI Learning Material.zip
02b34619beb144b89710d7ab061158f5_content
0387b0fc31dd4ff283ad42d45f4cce8c_content
086e13052d944cfb91e63e3efdddf0f4_content
103d17cacff94fab89f9d67cb6d5a8f7_content
1050e2fe671b45ada02b1334ce7b611c_content
17f21ebea07742099ea0d5a42be3be64_content
1d18af9bd6324789ab45851bd9623c09_content
49bbc036473b4d37977459a81bc32ca2_content
4b3fbc3f6aed4172bde8d91989744255_content
4cf0b6b358924eb4827205fb6af41faf_content
518ab35d225d4c6e93490d27eff58ca5_content
5b4261edfb4448899d30a5faef03590a_content
68bef99045974525a17e29ead8386c4a_content
6d05b809b96d48de9723fb4e024c539c_content
78b695008f34431f9b909d7b3e9656e0_content
8181841817604160bbd5639fcde8ec2a_content
835c18ab4f454d4aa21d5c1941dee5de_content
8de93a9219c840e0a65c21a37532f179_content
aa8ee2e85ea349568786f80f068865f6_content
b40dc0f01cab46679b051dd5eb35b787_content
b7f985614d11479b8492a29cb2c6e443_content
bc4dc4b3923f402d88ae315fcd203fd4_content
c37bddf7d9024bd7b3e25485dd797eda_content
cc1e246f5889498189ad599920bcea62_content
f2752ad056194e979b97a1d0c3e7db20_content
resources.cnt
contentmetadata.md
hash
ExportInformation.info

Kings Bounty.zip
dosbox.conf
GAME/
GAME/256.CC
GAME/416.CC
GAME/JIRKA.DAT
GAME/KB.EXE
GAME/START.BAT
GAME/content.xml
GAME/WEB.BAT
info.txt
mapper.txt
msvcp71.dll
msvcr71.dll
Play NOW.exe
README.TXT
SDL.dll
SDL_net.dll

Demo2 for application/zip Content-Type:
Body content-type is application/zip and content-length is 414716
Message attachments qty: 0
null
02b34619beb144b89710d7ab061158f5_content
0387b0fc31dd4ff283ad42d45f4cce8c_content
086e13052d944cfb91e63e3efdddf0f4_content
103d17cacff94fab89f9d67cb6d5a8f7_content
1050e2fe671b45ada02b1334ce7b611c_content
17f21ebea07742099ea0d5a42be3be64_content
1d18af9bd6324789ab45851bd9623c09_content
49bbc036473b4d37977459a81bc32ca2_content
4b3fbc3f6aed4172bde8d91989744255_content
4cf0b6b358924eb4827205fb6af41faf_content
518ab35d225d4c6e93490d27eff58ca5_content
5b4261edfb4448899d30a5faef03590a_content
68bef99045974525a17e29ead8386c4a_content
6d05b809b96d48de9723fb4e024c539c_content
78b695008f34431f9b909d7b3e9656e0_content
8181841817604160bbd5639fcde8ec2a_content
835c18ab4f454d4aa21d5c1941dee5de_content
8de93a9219c840e0a65c21a37532f179_content
aa8ee2e85ea349568786f80f068865f6_content
b40dc0f01cab46679b051dd5eb35b787_content
b7f985614d11479b8492a29cb2c6e443_content
bc4dc4b3923f402d88ae315fcd203fd4_content
c37bddf7d9024bd7b3e25485dd797eda_content
cc1e246f5889498189ad599920bcea62_content
f2752ad056194e979b97a1d0c3e7db20_content
resources.cnt
contentmetadata.md
hash
ExportInformation.info