topic Re: Adding a content transformer - NOT working in Alfresco Archive

Adding a content transformer - NOT working

leftright — Fri, 29 Jul 2011 09:11:16 GMT

On Debian I have written a shell script(works perfectly when called on terminal),that converts scanned PDF to PDF with computer textand I want to include this transformation in Alfresco.Since I have never tried adding a new content transformer, I startedwith only adding a pdf to tiff transformer in

Re: Adding a content transformer - NOT working

mrogers — Fri, 29 Jul 2011 09:32:34 GMT

It doesn't look like your transformer has been loaded.

What's the name of your file in tomcat/shared/classes/alfresco/extension ?

Is your shared class loader configured in tomcat? A crude simple test is to just create a deliberate syntax error in your file and restart - if alfresco fails to start or throws an ugly exception then your file is being found.

Re: Adding a content transformer - NOT working

leftright — Fri, 29 Jul 2011 10:11:37 GMT

the name of the file is ocr-peti-transformers-context.xml,
if I write some garbage in the file, I can't start the alfresco anymore.
so does this mean that the file is being loaded?

Re: Adding a content transformer - NOT working

mrogers — Fri, 29 Jul 2011 10:19:23 GMT

Yes - the file is being loaded.

Re: Adding a content transformer - NOT working

leftright — Fri, 29 Jul 2011 13:26:47 GMT

I have found the problem

instead of

<config evaluator="string-compare" condition="Action Wizards">
      <image-transformers>
      <transformer name="image/tiff"/>
     </image-transformers>
</config>‍‍‍‍‍

I used

<config evaluator="string-compare" condition="Action Wizards">
      <transformers>
      <transformer name="image/tiff"/>
     </transformers>
</config>‍‍‍‍‍

instead of using <image-transformers> I used <transformers>
and the transformation can now procees.

NOTE TO ADMIN: since I will probably encounter more problems while developing transformer, I thought that I wouldn't mark this topic as SOLVED,
and use it when I will encouter new problems. Is that OK? Edit - Admin - yes it is, glad you got it working

Re: Adding a content transformer - NOT working

leftright — Mon, 22 Aug 2011 09:42:29 GMT

Now I have tried to implement the whole transformation process, so from scanned PDF to PDF with text.
Because both the start and end type are in PDF, I have decided to split transformation in two parts.
First part is from PDF to Tiff, the second is from tiff to PDF. Now while the tiff to PDF part gets added to Alfresco,
the PDF to tiff part doesn't get added. When I look at the list of mimetype transformations in Alfresco, I see that the Tiff to Pdf
transformation goes via proxyContentTransformer, while the Pdf to Tiff goes via image/png(the default pdf to tiff transformation in Alfresco).
So is the problem in the already existing transformation in Alfresco?
This is my transformer for pdf to tiff.


<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE beans PUBLIC '-//SPRING//DTD BEAN//EN' 'http://www.springframework.org/dtd/spring-beans.dtd'>
 
<beans>
   <bean id="transformer.worker.img2ocrpdf" class="org.alfresco.repo.content.transform.RuntimeExecutableContentTransformerWorker">

      <property name="mimetypeService">
   <ref bean="mimetypeService" />
      </property>
      <property name="checkCommand">
         <bean class="org.alfresco.util.exec.RuntimeExec">
            <property name="commandMap">
                <map>
                    <entry key=".*">
         <value>chmod 755 /home/grega/ocr/pdf2tiff.sh</value>
                    </entry>
                </map>
            </property>
            <property name="errorCodes">
               <value>2</value>
            </property>
         </bean>
      </property>
      <property name="transformCommand">
         <bean class="org.alfresco.util.exec.RuntimeExec">
            <property name="commandMap">
                <map>
          <entry key=".*">
            <value>/home/grega/ocr/pdf2tiff.sh ${source} ${target}</value>
          </entry>
                </map>
            </property>
            <property name="errorCodes">
               <value>2</value>
            </property>
         </bean>
      </property>
      <property name="explicitTransformations">
       <list>
           <bean class="org.alfresco.repo.content.transform.ExplictTransformationDetails">
              <property name="sourceMimetype">
            <value>application/pdf</value>
         </property>
         <property name="targetMimetype">
            <value>image/tiff</value>
         </property>
      </bean>
       </list>
       </property>
   </bean>
   <bean id="transformer.img2ocrpdf" class="org.alfresco.repo.content.transform.ProxyContentTransformer" parent="baseContentTransformer">
      <property name="worker">
         <ref bean="transformer.worker.img2ocrpdf" />
      </property>
   </bean>
</beans>
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Adding a content transformer - NOT working

leftright — Fri, 26 Aug 2011 13:42:13 GMT

I have figured out why the pdf2tiff transformation wasn't picked, but the tiff2pdf was.
If you implement a transformer for a source and a target and the transformation between that source and traget in Alfresco already exists,
then you have to disable the already existing transormation.
You can see in this tutorial how to do this:
http://blog.metasys.pl/2011/01/speeding-up-pdf-indexing-in-alfresco-3-3/

Now I have a new problem. The pdf2tiff conversion gets picked, but it doesn't work.
The transformer calls the external script and I have found that the problem is in the convert command(Image Magick)
in the script. If I call the script from terminal(debian), the script works and convert command as well, but the convert
command doesn't work when called form Alfresco. I am using a external ImageMagick in script, my Alfresco also uses external
ImageMagick, and as I see it works fine(I can preview pictures in Share and also zoom in on them).

Any suggestion on what is wrong?

Re: Adding a content transformer - NOT working

vta — Wed, 06 Nov 2013 17:39:43 GMT

Hi LeftRight,

Im very interested indeed in your script to transform scanned PDF to PDF with computer text

Could you share it please?

Thanks in advance

Re: Adding a content transformer - NOT working

magarcia_sm — Tue, 22 Mar 2016 18:16:22 GMT

Hi

Let me ask you this question please as I am trying to get something similar, a tiff to OCR PDF transformation with ABBYY OCR CLI for linux.

We have an Alfresco 4.2.f CE instance and ABBYY OCR4Linux CLI 9 installed in our ubuntu machine. We have checked that ABBYY OCR works fine, but we are not able to run the transformation in Alfresco.

First of all we have included in our web-client-config-custom.xml


 <!– Add the tiff mime type to the list of supported transformations –>

    <config evaluator="string-compare" condition="Action Wizards">

        <transformers>

            <transformer name="image/tiff"/>

        </transformers>

    </config>

‍‍‍‍‍‍‍‍‍‍‍‍‍‍

and declared our transformation in tomcat/shared/classes/alfresco/extension


<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE beans PUBLIC '-//SPRING//DTD BEAN//EN' 'http://www.springframework.org/dtd/spring-beans.dtd'>

<beans>
    <bean id="transformer.tiff2pdf" class="org.alfresco.repo.content.transform.ProxyContentTransformer" parent="baseContentTransformer">
        <property name="worker">
            <ref bean="transformer.worker.tiff2pdf" />
        </property>
    </bean>


    <bean id="transformer.worker.tiff2pdf" class="org.alfresco.repo.content.transform.RuntimeExecutableContentTransformerWorker">
        <property name="mimetypeService">
            <ref bean="mimetypeService" />
        </property>
        <property name="checkCommand">
            <bean class="org.alfresco.util.exec.RuntimeExec">
                <property name="commandMap">
                    <map>
                        <entry key=".*">
                            <list>
                                <value>abbyyocr9</value>
                            </list>
                        </entry>
                    </map>
                </property>
            </bean>
        </property>

        <property name="transformCommand">
            <bean class="org.alfresco.util.exec.RuntimeExec">
                <property name="commandMap">
                    <map>
                        <entry key=".*">
                            <list>
                                <value>
                                    abbyyocr9 -rl Spanish -fm -rdss -afoe -if ${source} -f PDF -pfpf LZWGray -pem ImageOnText -pfpr 300 -prl -o$
                                </value>
                            </list>
                        </entry>
                    </map>
                </property>
                <property name="errorCodes">
                    <value>1,2</value>
                </property>
            </bean>
        </property>  <property name="explicitTransformations">
            <list>
                <bean class="org.alfresco.repo.content.transform.ExplictTransformationDetails">
                    <property name="sourceMimetype"><value>image/tiff</value></property>
                    <property name="targetMimetype"><value>application/pdf</value></property>
                </bean>
            </list>
        </property>
    </bean>
</beans>


‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Also in the http://localhost:8080/alfresco/service/mimetypes?mimetype=image/tiff#image/tiff we obtain the right transformation details


image/tiff - tiff
Extractors: org.alfresco.repo.content.metadata.TikaAutoMetadataExtracter
Transformable To:

    application/eps = Proxy via: com.sun.proxy.$Proxy15(Version: ImageMagick 6.8.6-6 2013-07-24 Q16 http://www.imagemagick.org Copyright: Copyright (C) 1999-2013 ImageMagick Studio LLC Features: DPC Modules Delegates: freetype jng jpeg png ps tiff wmf zlib)
    application/pdf = Proxy via: org.alfresco.repo.content.transform.RuntimeExecutableContentTransformerWorker(ABBYY FineReader Engine 9.0 Sample © ABBYY. 2010.
‍‍‍‍‍‍‍‍

However when we launch this transformation, we are able to get a PDF, but including the TIFF image with no OCR obtained… which makes me think that Alfresco is not calling our transformation to create this PDF.

I have followed also a suggestion I found in this module to disable ImageMagic by doing this


# mv /opt/alfresco-4.2.c/common/bin/.convert.bin /opt/alfresco-4.2.c/common/bin/.convert.old
‍‍‍

…. but if I do so I get this error message


 org.alfresco.service.cmr.repository.ContentIOException: 02220014 Content conversion failed:
   reader: ContentAccessor[ contentUrl=store://2016/3/22/19/8/c645e8f5-ef22-43a1-b593-eef80fb702b3.bin, mimetype=image/tiff, size=113244, encoding=UTF-8, locale=es_CL]
   writer: ContentAccessor[ contentUrl=store://2016/3/22/19/8/4cf527dd-d17f-41ef-843f-262b9c744357.bin, mimetype=application/pdf, size=0, encoding=UTF-8, locale=es_CL]
   options: {targetContentProperty={http://www.alfresco.org/model/content/1.0}name, contentReaderNodeRef=workspace://SpacesStore/16875bd0-0039-48a0-a670-8d3b87e21fc3, contentWriterNodeRef=workspace://SpacesStore/de83616b-0433-420c-84e2-e18c731aae1b, sourceContentProperty={http://www.alfresco.org/model/content/1.0}name, use=null, includeEmbedded=false}
   limits:

‍‍‍‍‍‍‍‍

Could you please point me which steps exactly did you follow to get your transofrmation working??

Thanks a lot