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titlePROGRESS
REFACTURE

Product Version2.4
Report Notepresentable
AssigneeAntje, Nils
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Resources & Remarks

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Concept article linking to the respecive tutorials

  • Antje: writing started

Modification History

NameDateProduct VersionAction
Antje08 FEB 20212.4New page properties macro.
Antje05 MAR 20212020 WinterNew interceptor type added.



Excerpt

Intervening a running process at a certain position and redirecting the process flow in order to include project-specific processing steps.

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Section
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Table of Contents

Table of Contents
exclude(Table of Contents|Read on|System Hooks|Another Concept Article|Another interesting Preprocessing Metadata using Webhooks|Interceptor Example Tutorial)


Introduction

The interceptors allow for project-specific extensions of the yuuvis® Momentum standard process flows. The running process flow can be intervened in redirected by a condition set on the processed object , that has to be specified in the interceptor definition. Whenever the process flow satisfies meets the condition, the project-specific process extension is included for the currently processed object at this position of the process flow. Thus, the alternative process can entirely replace the standard one from this position completely on or resume the standard process at a specified position.

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The condition for the intervention of the process flow is defined in the interceptor configuration file \system\interceptorConfiguration.json.

Parameters

The following parameters can/have to (question) be defined in are available for the interceptor configuration:

ParameterTypeRequiredDescription
typeStringyesThe type of the interceptor. It defines the position in the process flow where the interceptor can step in.
predicateStringyesThe condition that triggers the intervention redirection of the process flow in order to include the project-specific process extension. The string can provide the condition either in Spring Expression Language (SpEL) or Javascript. Thus, the string always has to start always with a prefix spel: for SpEL or js: for Javascript.
urlStringyesHTTP address of an external endpoint defining the project-specific process extension. Dynamic components (properties of the processed object) can be included in braces curly brackets.
useDirectoryuseDiscoveryBooleanbooleannoDecides whether to resolve the url string at the Discovery-Service or not. If not specified, a default value is set.

Interceptor Types

There are different types of interceptors available , that interrupt the process flow at different positions.

Intercepor Type

Interceptor type

Evaluation
Target
target of the
Predicate
predicateInterceptor input dataDescription
getContentAPI
dms
DMS object in JSON format derived from given objectIdobjectIdManipulation of the binary content of the return statement by a project-specific service
search
structure
Structure of the specific class SearchInterceptorObjectSearch query objectManipulation of the search query parameter and the search result.
updateDmsObject
first
First API
dms
DMS object in the list in JSON format
,
that is passed to the corresponding update endpointUpdated metadata and metadata of current versionManipulation of the update properties that will be applied to a
dms
DMS object.

Configuration Examples

The interceptor configuration is part of the (question). It is a JSON list of all interceptors, each of them specified by its type, predicate, url and useDirectory parameters. If there are two or more interceptors of the same type, all of them will be executed in random order.

The following two code examples show the configuration of a getContent interceptor. In the first case, the predicate contains the condition in JavaScript. In contrast, the second code example makes use of SpEL.

Code Block
languagejs
titlegetContent interceptor with Javascript condition
linenumberstrue
{
  "interceptors" : [
    { "type" : "getContent",
      "predicate" : "js:function process(dmsApiObject){return dmsApiObject[\"contentStreams\"][0][\"range\"]!=null && dmsApiObject[\"contentStreams\"][0][\"range\"].startsWith(\"page:\")}",
      "url" : "http://localhost:10666/api/dms/objects/{enaio:objectId}",
      "useDiscovery" : false     
    }
  ]
}
Code Block
languageyml
titlegetContent interceptor with SpEL condition
linenumberstrue
{
  "interceptors" : [
    { "type" : "getContent",
      "predicate" : "spel:contentStreams[0]['range'] != null ? contentStreams[0]['range'] matches '(?i)^page:.*' : false",
      "url" : "http://localhost:10666/api/dms/objects/{enaio:objectId}",
      "useDiscovery" : false     
    }
  ]
}

...

dms.request.objects.upsert.database-beforeAll objects of the objects  list in the data part of the multipart body after enrichment.a multipart request bodyThe take-off point of the interceptor is after the REPOSITORY service. The initial request body is already normalized, validated and enriched with content stream properties.

Interceptor Configuration Example

The following example configures an interceptor that will be trigger by every update of a content (action code 301). At the take-off point after the REPOSITORY service, the enriched request body is passed to the external endpoint specified by url.

To activate this configuration, the REPOSITORY service needs to be restarted. 

Code Block
languageyml
titlesearch interceptor with SpEL conditionExample interceptorConfiguration.json.
linenumberstrue
{
  	"interceptors" : [
    		{
			"type" : "searchdms.request.objects.upsert.database-before",
      			"predicate" : "spel:!grantedAuthorities.contains('ACCESS_FOREIGN_JOURNAL_OBJECTS')",
      options['action']==301",
			"url" : "http://localhost:10777exampleinterceptorcontentupdate/api/dms/searchobjects/dslupsert",
      			"useDiscovery" : false
    true
		}
  	]
}
Code Block
languageyml
titleDefinition of the SearchInterceptionObject class
linenumberstrue
public class SearchInterceptionObject
{
    private EnaioUserDetails enaioUserDetails;

   private List<String> grantedAuthorities; // liste der dem aktuellen Nutzer zugeordneten Authority-Namen
}
 
public class EnaioUserDetails extends User
{
    private String jwtAutorization;
    private String id;
    private String domain;
    private String tenant;
    private volatile long expiresAt;
 
    ...
 
}

Summary

This article gave an overview of the interceptor handling interceptors in yuuvis® Momentum. If you want to extend the functionality of your system, also system hooks also might be an interesting topic for you.


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Interceptor Example Tutorial

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Interceptor Example Tutorial
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System Hooks

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System Hooks
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Preprocessing Metadata using Webhooks

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Preprocessing Metadata using Webhooks
Preprocessing Metadata using Webhooks
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