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import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.joget.apps.form.service.FileUtil;
import org.joget.commons.util.SetupManager;
import org.joget.commons.util.LogUtil;
import java.util.Base64;
import org.joget.apps.app.model.AppDefinition;
import org.joget.apps.app.service.AppService;
import org.joget.apps.app.service.AppUtil;
import org.joget.apps.form.model.FormRow;
import org.joget.apps.form.model.FormRowSet;
import org.springframework.context.ApplicationContext;
 
String formDefId = "request";
String fileName = "#form.request.file_name#";
String tableName = "request";
String id = "#form.request.id#";
String formUploadField = "attachment";

//generate file from base64
String base64String = "#form.request.data#";
byte[] data = Base64.getDecoder().decode(base64String);

//store pdf
String path = FileUtil.getUploadPath(tableName, id);
final File file = new File(path + fileName);
try {
    //save the file into default folder
    FileUtil.storeFile(file, tableName, tableName);
    FileUtils.writeByteArrayToFile(file, data);
    
    //file saved successfully, update the form record to store the file name
    ApplicationContext ac = AppUtil.getApplicationContext();
    AppService appService = (AppService) ac.getBean("appService");
    AppDefinition appDef = AppUtil.getCurrentAppDefinition();
    FormRowSet set = appService.loadFormData(appDef.getAppId(), appDef.getVersion().toString(), formDefId, id);
    FormRow row = set.get(0);
    row.put(formUploadField, fileName);
    set.remove(0);
    set.add(0, row);
    appService.storeFormData(appDef.getAppId(), appDef.getVersion().toString(), formDefId, set, id);
    
} catch (IOException ex) {
    LogUtil.error("base64ToPDF App", ex, "Cannot generate file");
}