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Manage link integrity in Plone.

Project description


This package implement link integrity checking in Plone. It makes use of the zope3 event system in order to modify Plone itself as little as possible.


This package handles deleting an item in the Plone-User-interface (i.e. deleting items in the view folder_contents via Actions / Delete).

Whenever an object that is referred to by another one via an <a> or <img> tag is going to be deleted, a confirmation form is presented to the user. The same applies to content referenced via a relation field and indexed in the zc.relation catalog, like via the related items behavior. They can then decide to indeed delete the object, breaching link integrity of the site or first edit the objects that link to the item in question.

For relations set in a textfield, the isRelated reference is used. For these references, also handles modifications, if a content related via isRelated is modified. For all other related content, other mechanisms handle updates. One such handler can be found in

Changes in 3.0

  • Linkintegrity-relations are no longer stored in reference_catalog of Products.Archetypes. Instead it used zc.relation.

  • No longer intercept the request on manage_deleteObjects. This means that deleting with other methods (like manage_deleteObjects, plone.api.content.delete, ttw in the ZMI) no longer warns about linkintegrity-breaches. It now simply adds information about linkintegrity-breaches in the user-interface.

  • LinkIntegrityNotificationException is not longer thrown anywhere.

Refresh the linkintegrity site status

In the case you’ll need to update/refresh the linkintegrity status of the whole site, you can call the @@updateLinkIntegrityInformation view.

It can be really slow operation.


On object created, added, modified events the modifiedContent handler is called. This handler adapts an IRetriever object if found. The package comes with one general adapter for Dexterity content. You can easily write custom adapters implementing the IRetriever interface for your content type. Look at the retriever module in this package for examples.


To check if there would be breaches when deleting one or more objects you can use the following code:

from plone import api
portal = api.portal.get()
view = api.content.get_view(
breaches = view.get_breaches([obj1, obj2])

get_breaches ignores breaches originating from any items that would also be deleted by deleting the items (and their children if an item is a folder).

Each breach in breaches is a dictionary with a target (a dict with some info on the object to be deleted) and a list of sources. Each source is again a dict with uid, title, url and accessible (a boolean telling you if the user can access that source).

To check items for links in html-fields you can use the methods in


Test if an object is linked to by other objects.


Test if an object links to other objects.

utils.getIncomingLinks(obj, from_attribute)

Return a generator of incoming relations. from_attribute is optional and defaults to Is set to None, all references pointing to the object are searched.

utils.getOutgoingLinks(obj, from_attribute)

Return a generator of outgoing relations. from_attribute is optional and defaults to Is set to None, all references pointing from the object are searched.


Test if linkintegrity-feature is enables for users.


4.0.6 (2024-06-13)


4.0.5 (2024-05-30)

Bug fixes:

  • Fix potential issue calculating breaches with objects sharing the same prefix [pgrunewald] (#97)

4.0.4 (2024-05-06)

Bug fixes:

  • Improve performance for calculating breaches. [pgrunewald] (#100)

  • Fix breaches reporting for documents with multiple links. [pgrunewald] (#102)

4.0.3 (2023-09-29)

Bug fixes:

  • Report sources once per breach in delete_confirmation_info. [jaroel] (#95)

4.0.2 (2023-08-31)

Bug fixes:

  • Remove outgoing ‘isReferencing’ RelationValues from catalog on deleting content item. [ksuess] (#93)


  • Update configuration files. [plone devs] (7723aeaf)

4.0.1 (2023-04-14)


  • Update configuration files. [plone devs] (5623f8b3)

4.0.0 (2023-03-13)

Breaking changes:

  • Drop compatibility for Plone 5.2. Support Plone 6 only. [maurits] (#60)

Bug fixes:

  • Fixed test layer setup. Created content was bleeding into layers from other packages. [maurits] (#846)

3.6.1 (2022-04-28)

Bug fixes:

  • Test fix: only load migration layer on Python 2. [maurits] (#641)

3.6.0 (2022-02-23)

New features:

  • Track link integrity of referenced PDFs and other site objects in IFRAME SRC references. (#84)

3.5.0 (2021-12-29)

New features:

  • Track integrity of video and audio files in HTML source tags. (#77)

3.4.1 (2021-03-02)

Bug fixes:

  • Use base64.decodebytes instead of decodestring when possible. Fixes Python 3.9 compatibility in the tests. [maurits] (#81)

3.4.0 (2021-02-23)

New features:

  • Drop Plone 5.1 support, due to possible incompatibility with older [maurits] (#79)

Bug fixes:

  • Fix Unauthorized exception when you edit a page that links to another page that you are not allowed to see. Fixes issue 79. [maurits] (#79)

3.3.14 (2020-09-07)

Bug fixes:

  • Fixed deprecation warning for ComponentLookupError. [maurits] (#3130)

3.3.13 (2020-04-20)

Bug fixes:

  • Minor packaging updates. (#1)

3.3.12 (2019-10-12)

Bug fixes:

  • Explicitly load zcml of dependencies, instead of using includeDependencies. [maurits] (#2952)

3.3.11 (2019-06-27)

Bug fixes:

  • Add missing i18n:translate calls [erral] (#73)

3.3.10 (2019-06-19)

Bug fixes:

  • Accept to have a broken object w/o aq_parent in test. [jensens] (#72)

3.3.9 (2019-05-01)

Bug fixes:

  • Fix wrong i18n:translate to avoid ${DYNAMIC_CONTENT} in translation files [erral] (#69)

3.3.8 (2019-02-08)

No significant changes.

3.3.7 (2018-09-23)

Bug fixes:

  • Fix tests in Python 3 [pbauer]

3.3.6 (2018-06-19)

Bug fixes:

  • Fix test to work with merged plone.login. [jensens]

  • Python 3 compatibility. [pbauer]

3.3.5 (2018-04-04)

Bug fixes:

  • Mark strings in delete confirmation screen translatable [erral]

3.3.4 (2018-02-04)

Bug fixes:

  • Optimize migration of old Archetypes references. [davisagli]

  • Prepare for Python 2 / 3 compatibility. [ale-rt, pbauer]

3.3.3 (2017-10-02)

New features:

  • Prevent linkintegrity-handler from doing anything when it is switched of in the registry. This change also prevents some issues in migration from AT to DX since linkintegrity is disabled during the migration. [pbauer]

Bug fixes:

  • Fix a missing tal condition in that caused a paragraph to be always visible, even without link breaches. [arsenico13]

  • Fix view @@updateLinkIntegrityInformation after Language=’all’ no longer works. [pbauer]

3.3.2 (2017-08-14)

Bug fixes:

  • Do not fail on invalid objects in reference_catalog. Fixes issue 32 and 48. [pbauer]

  • Fix undeclared hard dependency on Archetypes [tomgross]

3.3.1 (2017-06-01)

Bug fixes:

  • Improved code quality. [gforcada]

  • removed unittest2 dependency [kakshay21]

3.3 (2017-04-20)

New features:

  • Support for any zc.relation refercences being checked by delete_confirmation_info dialog, not only references linked in text. [thet]

Bug fixes:

  • PEP8. [thet]

  • Update code to follow Plone styleguide. [gforcada]

3.2.2 (2017-04-02)

New features:

  • Use plone.namedfile for testing images [didrix]

Bug fixes:

  • Fix typo in logging method [tomgross]

3.2.1 (2017-02-20)

Bug fixes:

  • Show breakage info even if catalog is out of sync [tomgross]

3.2.0 (2017-02-12)

New features:

  • Compatibility with ZCatalog 4 (upgrade steps) [pbauer, jensens]

3.1 (2016-12-30)

New features:

  • Information about contents within a selected folder for deletion. This information contains number of deleted objects, number of subfolders and number of published objects. [karalics]

3.0.8 (2016-11-09)

Bug fixes:

  • Add coding headers on python files. [gforcada]

  • Remove hard dependency on Archetypes (again). [davisagli]

3.0.7 (2016-09-16)

Bug fixes:

  • Use transaction savepoints while calling @@updateLinkIntegrityInformation to keep memory usage under control. [ale-rt]

3.0.6 (2016-08-17)

Bug fixes:

  • Fix object url in delete confirmation [vangheem]

  • Use zope.interface decorator. [gforcada]

3.0.5 (2016-04-15)


3.0.4 (2016-02-02)


  • Handle links that do not have an intid yet. Should help with upgrade issues. [vangheem]

  • make handler.findObject() work when the webserver rewrites the portal name [tschorr]

3.0.3 (2015-11-26)


  • Introduce IRetriever adapter for customization flexibility. [tomgross]

3.0.2 (2015-09-27)

  • Remove xml:lang and wrong xmlns from [vincentfrentin]

3.0.1 (2015-09-11)

  • Don’t show delete_confirmation_info twice in delete_confirmation. Fixes #27 [pbauer]

3.0 (2015-09-08)

  • Drop the Archetypes-dependency by switching to use zc.relation instead of reference_catalog (Products.Archetypes). [bloodbare, pbauer, vangheem]

  • No longer intercept the request on manage_deleteObjects. Instead only inject a warning in delete_confirmation. This means that deleting with other methods (like manage_deleteObjects, plone.api.content.delete, ttw in the ZMI) no longer warns about linkintegrity-breaches. [bloodbare, pbauer, vangheem]

  • LinkIntegrityNotificationException is not longer thrown anywhere. [bloodbare, pbauer, vangheem]

2.1.2 (2015-05-04)

  • Fix html structure in [vincentfretin]

2.1.1 (2015-03-13)

  • When using the update view for dexterity objects, only call the method if object provides IReferenceable [frapell]

  • Removed Zope 2.10 compatibility from publisher monkey patch. [davisagli]

2.1.0 (2014-10-23)

  • Read the enable_link_integrity_checks setting from instead of from the portal_properties. [timo]

  • Restructure package to fully support dexterity framework. Use two different test layers in, migrate all doctests into real TestCases. [saily, do3cc]

2.0.0 (2014-04-13)

1.5.6 (2015-08-13)

  • Backport improvements to @@updateLinkIntegrityInformation from plone5 branch. [pbauer]

1.5.4 (2014-01-27)

  • Added support for sub path after uid of resolveuid [hoka]

1.5.3 (2013-08-13)

  • Set a maxsize when decompressing request data. [davisagli]

  • Fixed dexterity referenceablebehavior integration. [maurits]

  • Fix #13681, documents referencing each other will now also trigger a link integrity warning. [do3cc]

1.5.2 (2013-05-23)

  • Exceptions now return the repr() and not the str() of the object. This way we avoid, for File content types, loading the whole object data into memory. This closes [ericof]

1.5.1 (2013-03-05)

  • unicode links should not raise errors. Fixes [vangheem]

  • Dexterity: use zope.lifecycleevent instead of interfaces for Plone 4.3 support. [jone]

  • Avoid a bug during link integrity check when a source or target of the reference has been already removed during the deletion process. This can happen during large delete processes. [thomasdesvenain]

  • Monkey patch the Zope HTTPResponse status_code to include a mapping for linkintegritynotificationexception, to return a 200 code. [thepjot]

1.5.0 (2013-01-17)

  • Fix a remove confirmation view bug. Displays the portal type title rather than the portal type name. This change also broke some tests that were checking for the name rather than the title, but I just fixed those. [jianaijun]

  • Added support for Dexterity content types. Link integrity support for Dexterity requires the behavior to be enabled so that the Dexterity item can be used with Archetypes references. [jpgimenez]

1.4.7 (2012-10-03)

1.4.6 (2012-07-02)

  • No more dependencies. [hannosch]

  • Remove hard dependency on Archetypes. [davisagli]

1.4.5 - 2012-02-24

  • Fix an error in handling absolute links to objects within the portal, which prevented references from being created based on those links. This closes [davisagli]

  • Stabilize the sort order of breach sources returned for the confirmation view. [davisagli]

  • Use the get method to retrieve the field value if the instance does not provide an accessor method. This is the case for instance for fields which have been added via schema extension. [malthe]

  • Support resolveuid/UID references explicitly, by parsing and resolving these ourselves instead of relying on a view or script (which doesn’t work). This fixes linkintegrity for sites with link-by-uid turned on. This closes [mj]

1.4.4 - 2011-10-04

1.4.3 - 2011-09-14

  • Fix integrity reference generation for content not accessible by the editor. [witsch]

  • Fix handling of relative links instead of relying on Acquisition. [witsch]

1.4.2 - 2011-07-04

1.4.1 - 2011-05-12

  • Fix decoding of colon-delimited list of confirmed oids in the request when one of the oids contains a colon. [davisagli]

  • Add [WouterVH]

1.4.0 - 2011-01-03

  • Use plone.uuid to look up content UUIDs. [toutpt, davisagli]

1.3.3 - 2011-07-05

1.3.2 - 2011-05-12

  • Fix decoding of colon-delimited list of confirmed oids in the request when one of the oids contains a colon. [davisagli]

1.3.1 - 2010-08-08

  • Adjusted tests to no longer rely on sub-collections. [hannosch]

  • Use the official aq_get API to acquire the request from a context. [hannosch]

1.3.0 - 2010-07-18

  • Update license to GPL version 2 only. [hannosch]

1.3b2 - 2010-06-13

  • Avoid using the deprecated five:implements directive. [hannosch]

1.3b1 - 2010-06-03

1.3a5 - 2010-05-01

  • Properly handle retry exception instead of getting the special-casing of exception handling when publishing with debug=1 [davisagli]

1.3a4 - 2010-03-06

  • Do not abort if a text field is None. In that case the HTML parser raises a TypeError instead of an HTMLParseError. [wichert]

1.3a3 - 2010-02-18

1.3a2 - 2009-12-02

1.3a1 - 2009-11-17

  • Access the subtopics page directly since the tab is now hidden by default. [davisagli]

  • Partially disable the test regarding the undo log as the outcome differs between Plone 3 and 4, probably due to changes in the test setup. Refs [witsch]

  • Add test to verify undo log entries are not longer missing after removing items via the “delete” action. Refs [witsch]

1.2 - 2009-10-10

  • Also catch NotFound exceptions when trying to resolve linked objects. [optilude]

1.1 - 2009-08-31

  • Make compatible with repoze.zope2. See README.txt for notes on how to deploy. [optilude]

  • Don’t use id() to record confirmed items. It can change on request boundaries. Use an encoded _p_oid instead. [optilude]

  • Also regard traversal adapters when trying to resolve links into their corresponding objects. [witsch]

  • Fix some tests to make sure that text values are treated as text/html in Zope 2.12, whose zope.contenttype is stricter when guessing the mimetype. [davisagli]

  • Don’t install the exception hook in Zope 2.12 where it is no longer needed and breaks exception handling. [davisagli]

1.0.12 - 2009-06-03

  • Compare UIDs instead of objects during cleanup of breach information in order to avoid expensive hashing in “… in …” expressions. This makes removing linked objects much faster. [regebro]

1.0.11 - 2008-11-15

1.0.10 - 2008-07-07

  • Fixed the recognizing of links to files (or any object) with a space in the id. Fixes [maurits]

  • Updated tests to work with LinguaPlone by unmarking the creation flag on new objects. [maurits]

1.0.9 - 2008-05-08

  • Use acquisition API to support the “philikon-aq” branch. [witsch]

  • Fix a problem with updating link integrity references during a request which trying to delete multiple other objects. [witsch]

1.0.8 - 2008-04-21

1.0.7 - 2008-03-27

  • Fixed accidental removal of references not related to link integrity. [dunny]

1.0.6 - 2008-03-08

  • Added missing namespace declaration to avoid the warning about it. [wiggy]

1.0.5 - 2008-02-13

1.0.4 - 2008-01-03

  • Handle IObjectRemovedEvents with no attached request object. [witsch]

  • Updated tests to work with Plone 4.0. [hannosch]

  • Referencing items are now listed in alphabetical order [witsch]

1.0.3 - 2007-12-05

  • Fixed setting up the test layer after GenericSetup update [witsch]

1.0.2 - 2007-11-07

  • Fixed parser error when handling malformed HTML [witsch]

  • Fixed security issue due to using pickles (see CVE-2007-5741) [witsch]

1.0.1 - 2007-09-10

  • Added view for updating link integrity information for all site content [witsch]

  • Made code in more tolerant when encountering missing property sheets. [hannosch]

1.0 - 2007-08-16

  • Minor bug fixes and enhancements [witsch]

1.0rc1.1 - 2007-07-12

  • Bug and test fixes after upgrade to Zope 2.10.4 [witsch]

1.0rc1 - 2007-07-08

  • Bugfixes & additional tests [witsch]

1.0b3 - 2007-05-04

  • No changes.

1.0b2 - 2007-04-30

  • Integration of Plone’s “delete confirmation” page [witsch]

1.0b1 - 2007-03-03

  • Fix tests in regard to changed folder_contents and unicode issues [witsch]

  • Updates to the monkey patch needed for five exceptions [wiggy]

1.0a2 - 2007-02-07

  • Bugfixes & other minor enhancements [witsch]

  • Eggification and move into namespace [optilude]

  • Proof of concept & initial version [witsch]

  • Initial package structure. [zopeskel]

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