Update Image with new image variants programmatically

[singh.bh...@gmail.com]

Hi,

I have defined a custom image set i.e. CustomImageSet with 5-6 variant in it. I have uploaded few images after that and found that all image variants has been created automatically. Now i have added 2 more variants to my imageset but when i checked my image it shows blank content for the new variants. Is there a way i can create the new variants for my already existing images.

Thanks

Bhupendra Singh 

[Woonsan Ko]

On Wed, Jul 19, 2017 at 4:39 AM, <singh.bh...@gmail.com> wrote:

Hi,

I have defined a custom image set i.e. CustomImageSet with 5-6 variant in it. I have uploaded few images after that and found that all image variants has been created automatically. Now i have added 2 more variants to my imageset but when i checked my image it shows blank content for the new variants. Is there a way i can create the new variants for my already existing images.

If you can write a groovy script or java code which is iterating all those existing image sets, then you might want to use the techniques shown in the following page:

- https://onehippo-forge.github.io/gallery-magick/core/dev-howto.html#Creating_a_Thumbnail_Image_Using_ScalrProcessorUtils

You can create new variant images into temporary files and update those variant node with those.

It's slightly a different use case, but you might want to take a look at the example here, too (content-exim uses gallery-magick component internally as well):

- https://onehippo-forge.github.io/content-export-import/tutorials-import-bins.html

Regards,

Woonsan

 

Thanks

Bhupendra Singh 

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[jerr...@gmail.com]

Woonsan,   

  

     I am trying to do something similar and found this thread. I tried the approach using  org.onehippo.forge.gallerymagick.core.command.ScalrProcessorUtils  from Groovy, but get a security exception: "Caused by: java.lang.SecurityException: Importing [java.io.File] is not allowed" 

    It appears all the Hippo utilities take java.io.File and never inputstreams. I can get an inputstream from the imagegallery node's jcr:data property but can't use GroovyUpdaterEditor to create a file with it to use these utilities. Any chance there might be underlying methods that use an inputstream and return an outputstream that can be placed back on a jcr:data property?

Thanks

Jerry

On Monday, July 24, 2017 at 2:33:38 PM UTC-4, woonsan.ko wrote:

On Wed, Jul 19, 2017 at 4:39 AM, <singh.bh...@gmail.com> wrote:

Hi,

I have defined a custom image set i.e. CustomImageSet with 5-6 variant in it. I have uploaded few images after that and found that all image variants has been created automatically. Now i have added 2 more variants to my imageset but when i checked my image it shows blank content for the new variants. Is there a way i can create the new variants for my already existing images.

If you can write a groovy script or java code which is iterating all those existing image sets, then you might want to use the techniques shown in the following page:

- https://onehippo-forge.github.io/gallery-magick/core/dev-howto.html#Creating_a_Thumbnail_Image_Using_ScalrProcessorUtils

You can create new variant images into temporary files and update those variant node with those.

It's slightly a different use case, but you might want to take a look at the example here, too (content-exim uses gallery-magick component internally as well):

- https://onehippo-forge.github.io/content-export-import/tutorials-import-bins.html

Regards,

Woonsan

 

Thanks

Bhupendra Singh 

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[Woonsan Ko]

Hi Jerry,

Please see my comments inline.

On Thu, Nov 30, 2017 at 1:53 PM, <jerr...@gmail.com> wrote:

Woonsan,   

  

     I am trying to do something similar and found this thread. I tried the approach using  org.onehippo.forge.gallerymagick.core.command.ScalrProcessorUtils  from Groovy, but get a security exception: "Caused by: java.lang.SecurityException: Importing [java.io.File] is not allowed" 

Yes, hippo groovy engine has some blacklist classes *by checking the types in the script source*, but it's not checking a runtime object, which is the trick.

You can use VFS library and its FileObject class instead as shown in the example [1]:

Or, you can simply use Content EXIM library [1] to do that because it has several utilities already to import/export hippo binary assets/galleries, etc.

Also, see the javadocs such as [2] too.

[1] https://onehippo-forge.github.io/content-export-import/tutorials-import-bins.html

[2] https://onehippo-forge.github.io/content-export-import/apidocs/org/onehippo/forge/content/exim/core/util/ContentFileObjectUtils.html

 

    It appears all the Hippo utilities take java.io.File and never inputstreams. I can get an inputstream from the imagegallery node's jcr:data property but can't use GroovyUpdaterEditor to create a file with it to use these utilities. Any chance there might be underlying methods that use an inputstream and return an outputstream that can be placed back on a jcr:data property?

Content EXIM provides some workaround utilities already. You will find almost everything there from javadocs and example.

Regards,

Woonsan

 

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Woonsan Ko

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[jerr...@gmail.com]

Thanks Woonsan. I wound up going native java/awt to avoid File. I have something working that I just need to fiddle with. Here is the groovy:

package org.hippoecm.frontend.plugins.cms.admin.updater

import org.onehippo.repository.update.BaseNodeUpdateVisitor

import javax.jcr.Node

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import javax.imageio.ImageIO;

class UpdaterTemplate extends BaseNodeUpdateVisitor {

  int width;

  int height;

  

  boolean doUpdate(Node node) {

    if (!"oakwood:PropertyImageSet".equals(node.getPrimaryNodeType().getName())) return false;

    log.debug "Updating node ${node.path}"

    java.io.InputStream is = node.getNode("hippogallery:original").getProperty("jcr:data").getValue().getBinary().getStream();

    

    

    Node thumbnail = node.getNode("hippogallery:thumbnail");

Node newNode = node.addNode("hippogallery:sample","hippogallery:image");

newNode.setProperty("jcr:mimeType", thumbnail.getProperty("jcr:mimeType").getValue());

    newNode.setProperty("hippogallery:height", this.height);

    newNode.setProperty("hippogallery:width", this.width);

    newNode.setProperty("jcr:lastModified", new java.util.GregorianCalendar());

     

String formatName = thumbnail.getProperty("jcr:mimeType").getValue().getString().replaceAll(".*/", "");

    is = resize(is, 100, 100, formatName)

    log.debug "resized"

    

newNode.setProperty("jcr:data",is);

    

    return true;

  }

  boolean undoUpdate(Node node) {

    throw new UnsupportedOperationException('Updater does not implement undoUpdate method')

  }

  

  public InputStream resize(InputStream is,

            int scaledWidth, int scaledHeight, String formatName)

            throws IOException {

        // reads input image

        BufferedImage inputImage = ImageIO.read(is);

 

        // creates output image

        BufferedImage outputImage = new BufferedImage(scaledWidth,

                scaledHeight, inputImage.getType());

 

        // scales the input image to the output image

        Graphics2D g2d = outputImage.createGraphics();

        g2d.drawImage(inputImage, 0, 0, scaledWidth, scaledHeight, null);

        g2d.dispose();

 

        

        // writes to output file

        ByteArrayOutputStream os = new ByteArrayOutputStream();

        ImageIO.write(outputImage, formatName, os);

        InputStream returnIs = new ByteArrayInputStream(os.toByteArray());

              

        this.height = outputImage.getHeight();

        this.width = outputImage.getWidth();

        return returnIs;

[jerr...@gmail.com]

After some tips from Woonsan I go a variation working that uses the ScalrProcessorUtils. In this version I'm hard-coding the new target size to 100x100 but then reading the resulting rescaled image for the true height.

package org.hippoecm.frontend.plugins.cms.admin.updater

import org.onehippo.repository.update.BaseNodeUpdateVisitor

import javax.jcr.Node

import java.awt.Graphics2D;

import org.apache.jackrabbit.value.BinaryValue

import org.onehippo.forge.content.exim.core.util.ContentFileObjectUtils

import org.onehippo.forge.gallerymagick.core.command.ScalrProcessorUtils

import org.onehippo.forge.gallerymagick.core.ImageDimension

import org.onehippo.forge.content.pojo.model.ContentPropertyType

class UpdaterTemplate extends BaseNodeUpdateVisitor {

  

  boolean doUpdate(Node node) {

    if (!"oakwood:PropertyImageSet".equals(node.getPrimaryNodeType().getName())) return false;

    log.debug "Updating node ${node.path}"

    java.io.InputStream is = node.getNode("hippogallery:original").getProperty("jcr:data").getValue().getBinary().getStream();

    

    

    Node thumbnail = node.getNode("hippogallery:thumbnail");

Node newNode = node.addNode("hippogallery:sample","hippogallery:image");

newNode.setProperty("jcr:mimeType", thumbnail.getProperty("jcr:mimeType").getValue());

    newNode.setProperty("jcr:lastModified", new java.util.GregorianCalendar());

     

String formatName = thumbnail.getProperty("jcr:mimeType").getValue().getString().replaceAll(".*/", "");

    resize(node.getNode("hippogallery:original"),newNode, 100, 100, formatName)

    log.debug "resized"

    

    

    return true;

  }

  boolean undoUpdate(Node node) {

    throw new UnsupportedOperationException('Updater does not implement undoUpdate method')

  }

  

  public void resize(Node original, Node resized,

            int scaledWidth, int scaledHeight, String formatName)

            throws IOException {

def newFile = ContentFileObjectUtils.createTempFile(original.getName(), "."+formatName);

def oldFile = ContentFileObjectUtils.createTempFile(original.getName(), "."+formatName);

//put the original in a file

OutputStream os = oldFile.getContent().getOutputStream();

InputStream is = original.getProperty("jcr:data").getValue().getBinary().getStream();

byte[] buffer = new byte[is.available()];

is.read(buffer);

os.write(buffer);

is.close();

os.close();

        ScalrProcessorUtils.resizeImage(ContentFileObjectUtils.toFile(oldFile), ContentFileObjectUtils.toFile(newFile), 

                                        ImageDimension.from(scaledWidth+"x"+scaledHeight))

        

        resized.setProperty("jcr:data", newFile.getContent().getInputStream())

        

        def dimension = ScalrProcessorUtils.identifyDimension(ContentFileObjectUtils.toFile(newFile))

                                                                    

        resized.setProperty("hippogallery:height", dimension.getHeight())

        resized.setProperty("hippogallery:width", dimension.getWidth())

[Jeroen Hoffman]

Hi,

For regenerating image sets, I think it would be easy to re-use the script that is embedded in the essentials Gallery Manager, at

https://code.onehippo.org/cms-community/hippo-essentials/blob/master/plugins/gallery-manager/src/main/resources/ImageSetUpdater.groovy

HTH

Jeroen

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[jerr...@gmail.com]

Thanks Jeroen, that is very useful. It looks like that will dynamically handle all the image sets, I will test that out. 

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[Brian Snijders]

Hi guys,

Just to jump in a bit as I saw this thread coming by and recognised the same challenge as I've had before. I haven't checked your script Jeroen, but in the past I've managed to rescale existing images and create new variants by instantiating a ScalingGalleryProcessor, providing scaling parameters of the desired image dimensions to it as a constructor argument. The actual implementation can be found in "org.hippoecm.frontend.plugins.gallery.processor.ScalingGalleryProcessor" and from there on you should be able to write a Groovy Script using the SGP.

I can imagine, without having checked it, that the Essentials script follows the same path. If so, then my reply is just a real world confirmation that you can actually use the SGP for this issue succesfully. 

@Jerry, the SGP will also able operate on streamed data; your route on streamed data is the same as I did in the past, so it should work :).

Cheers,

Brian

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