Text field with MIME type support

Introduction

This package provides a zope.schema style field type called RichText which can be used to store a value with a related MIME type. The value can be transformed to an output MIME type, for example to transform from structured text to HTML.

Basic Usage

To use the field, place it in a schema like so:

from plone.app.textfield import RichText
from zope.interface import Interface

class ITest(Interface):

bodyText = RichText(
title=u"Body text",
default_mime_type='text/structured',
output_mime_type='text/html',
allowed_mime_types=('text/structured', 'text/plain',),
default=u"Default value"
)

This specifies the default MIME type of text content as well as the default output type, and a tuple of allowed types. All these values are optional. The default MIME type is ‘text/html’, and the default output type is ‘text/x-html-safe’. By default, allowed_mime_types is None, which means that the side-wide default set of allowable input MIME types will be permitted.

Note that the default value here is set to a Unicode string, which will be considered to be of the default MIME type. This value is converted to a RichTextValue object (see below) on field initialisation, so the default property will be an object of this type.

The field actually stores an immutable object of type plone.app.textfield.value.RichTextValue. This object has the following attributes:

raw

The raw value as a Unicode string.

mimeType

The MIME type of the raw text.

output

A Unicode string that represents the value transformed to the default output MIME type. Maybe None if the transformation could not be completed successfully, but will be cached after it has been successfully transformed once.

outputMimeType

The MIME type of the output string. This is normally copied from the field’s output_mime_type property.

Storage

The output, mimeType and outputMimeType properties will be stored in the same _p_jar as the parent content object, whilst the raw value is stored in a separate persistent object. This is to optimize for the common case where the output is frequently accessed when the object is viewed (and thus should avoid a separate persistent object load), whereas the raw value is infrequently accessed (and so should not take up memory unless specifically requested).

Transformation

Transformation takes place using an ITransformer adapter. The default implementation uses Plone’s portal_transforms tool to convert from one MIME type to another. Note that Products.PortalTransforms must be installed for this to work, otherwise, no default ITransformer adapter is registered. You can use the [portaltransforms] extra to add Products.PortralTransforms as a dependency.

To invoke alternative transformations from a page template, you can use the following convenience syntax:

<div tal:content="structure context/@@text-transform/fieldName/text/plain" />

Here fieldName is the name of the field (which must be found on context and contain a RichTextValue). text/plain is the desired output MIME type.

Optional Features

The package also contains a plone.supermodel export/import handler, which will be configured if plone.supermodel is installed. You can use the [supermodel] extra to add a plone.supermodel dependency.

A z3c.form widget will be installed if z3c.form is installed. The [widget] extra will pull this dependency in if nothing else does.

A plone.rfc822 field marshaler will be installed if plone.rfc822 is installed. The [marshaler] extra will pull this dependency in if nothing else does.

A plone.schemaeditor field factory will be installed if plone.schemaeditor is installed. The editor extra will pull this dependency if nothing else does.

Usage with Simple TextArea

Alternatively, the RichText Field may be used without a WYSIWYG editor displaying a simple TextArea on input, and formatted output as HTML on display. In this example, it is expected to have the plone.intelligenttext transform available. Also expected is plone.autoform and plone.app.z3cform to be installed.

from z3c.form.browser.textarea import TextAreaFieldWidget
from plone.autoform.directives import widget

class ITest(Interface):

bodyText = RichText(
title=u"Intelligent text",
default_mime_type='text/x-web-intelligent',
allowed_mime_types=('text/x-web-intelligent', ),
output_mime_type='text/x-html-safe',
default=u"Default value"
)
widget(
'bodyText',
TextAreaFieldWidget,
)

Input is a simple text. At display, an HTML in rendered by the transform and shown. To show HTML unescaped the output has to be ‘text/x-html-safe’.

See field.txt for more details about the field’s behavior, and handler.txt for more details about the plone.supermodel handler.

Issue tracker

Please report issues via the Plone issue tracker.

Support

Questions may be answered via Plone’s support channels.

Contributing

Sources are at the Plone code repository hosted at Github.

Contributors please read the document Process for Plone core’s development

Changelog

1.3.6 (2021-11-25)

Bug fixes:

• Fix usage of wysiwyg editor settings from portal_properties to registry [duchenean, gotcha] (#45)

1.3.5 (2020-09-26)

Bug fixes:

• Fixed deprecation warning for zope.component.interfaces.ComponentLookupError. [maurits] (#43)

1.3.4 (2020-04-20)

Bug fixes:

• Minor packaging updates. (#1)

1.3.3 (2020-03-09)

Bug fixes:

• Black-en & isort code. [thet] (#39)

1.3.2 (2019-09-13)

Bug fixes:

• Check if transform output is actual string on Python 2. [agitator] (#37)

1.3.1 (2019-03-21)

Bug fixes:

• fix python 3 issue when checking referenced images in transform [petschki] (#34)

• Initialize towncrier. [gforcada] (#2548)

1.3.0 (2018-10-31)

New features:

• Python 3 fixes, needs plone.rfc822>=2.0b1. [jensens]

• Add getSize method to get the size of a RichTextValue in bytes [davisagli]

Bug fixes:

• Fix doctests tests in py3 [pbauer]

1.2.12 (unreleased)

Bug fixes:

• purge transform cache when a uid referenced image gets updated. this fixes issue CMFPLone#2465 [petschki]

1.2.11 (2018-04-08)

Bug fixes:

• Python 3 fixes [pbauer]

1.2.10 (2018-01-30)

Bug fixes:

• Imports are Python3 compatible [b4oshany]

1.2.9 (2017-07-18)

Bug fixes:

• Made sure the new simple textarea template is not used for rich text widgets, but only for simple textarea widgets. Otherwise you see this in the display: RichTextValue object. (Did you mean .raw or .output?). Fixes issue 22. [maurits]

1.2.8 (2017-02-05)

New features:

• Enable the RichText field to work together with a simple ITextAreaWidget. [jensens]

Bug fixes:

• Cleanup: Use more zope.interface decorators, add utf8 headers, isort imports, zcml conditions are enough. [jensens]

1.2.7 (2016-08-10)

Fixes:

• Use zope.interface decorator. [gforcada]

1.2.6 (2015-05-31)

• Fix negative equality bug RawValueHolder and RichTextValue introduced in 1.2.5. [jone]

1.2.5 (2015-03-26)

• Add equality check (__eq__) for RawValueHolder and RichTextValue; [davisagli]

• Fix marshaler decode to always decode raw value into unicode [datakurre]

• Remove utils.getSiteEncoding, which was deprecated and not used anywhere. [thet]

• For Plone 5, support getting markup control panel settings from the registry, while still supporting normal portal_properties access for Plone < 5. [thet]

• Resolved an interesting circular import case, which wasnt effective because of sort order of imports [thet]

1.2.4 (2014-10-20)

• Force WYSIWYG, so when we start with ‘text/plain’ (or another MIME), selecting ‘text/html’ will cause TinyMCE to spring into life. [lentinj]

• Tell Products.TinyMCE what the MIME type is, so it doesn’t have to work it out. [lentinj]

• Use closest_content to navigate through the sea of subforms to find something that we can use portal_url on. [lentinj]

• Do not give an error when the raw value is not unicode and isn’t ascii. In that case, encode as unicode then decode as the proper string, bang head on desk. [eleddy]

• Internationalization. [thomasdesvenain]

1.2.3 (2014-01-27)

• Do not give an error when the raw value is None. Give an empty unicode string as output in that case. [maurits]

1.2.2 (2013-01-01)

• Add support for collective.ckeditor. [tschorr]

1.2.1 (2012-08-14)

• Fix compatibility with Zope 2.12. [davisagli]

1.2 (2012-08-14)

• Pass field’s max_length to the wysiwyg macro, if it has one. [davisagli]

• Determine which editor’s wysiwyg_support template to use from within widget_input.pt. Fixes support for collective.ckeditor. [tschorr, davisagli]

• Update getSite import locations. [hannosch]

• Make sure that the display widget absolutizes relative links relative to the correct context. To facilitate doing this from custom templates, RichTextValue now has an output_relative_to helper method which can be passed a context. [davisagli]

• Fix an issue with the support for plone.schemaeditor. [davisagli]

• Support a max_length parameter for RichText fields. Input longer than the max_length does not pass validation. [davisagli]

• Pass some additional context to the wysiwyg_support macro to help with determining the field’s mimetype. [davisagli]

• Changed deprecated getSiteEncoding to hardcoded utf-8 [tom_gross]

1.1 - 2012-02-20

• Provide a version of the RichText field schema for use with plone.schemaeditor. Only the default_mime_type field is exposed for editing through-the-web, with a vocabulary of mimetypes derived from the AllowedContentTypes vocabulary in plone.app.vocabularies (which can be adjusted via Plone’s markup control panel). [davisagli]

• Log original exception when a TransformError is raised. [rochecompaan]

1.0.2 - 2011-11-26

• If no transform path is found: Instead of throwing an exception page in the face of the user, now return an empty string and log error message. [kleist]

• Fix infinite recursion bug when source and target mimetype is the same. [rochecompaan]

1.0.1 - 2011-09-24

• Make sure the field constraint is validated, if specified. This closes http://code.google.com/p/dexterity/issues/detail?id=200 [davisagli]

• Make sure validation fails if no text is entered for a required field. This closes http://code.google.com/p/dexterity/issues/detail?id=199 [davisagli]

• Wrap the context in the form context, not the site, so that relative links are generated correctly. [davisagli]

• Avoid duplicating the id of the textarea if the form has no prefix. [davisagli]

• Fix case where editor did not load if the context being edited is a dict. [davisagli]

• Pass through the z3c.form widget’s rows and cols settings to the wysiwyg editor macro. [davisagli]

1.0 - 2011-04-30

• Fix failing test. [davisagli]

1.0b6 - 2010-04-18

• Fix the field schemata so they can be used as the form schema when adding the field using plone.schemaeditor [rossp]

• Remove unused lookup of the current member’s editor preference. This is handled by the wysiwyg_support macros. [davisagli]

1.0b5 - 2009-11-17

• Fix an error that could occur if the user did not have an editor preference set. [optilude]

• Fix tests on Plone 4. [optilude]

• Add field factory for use with plone.schemaeditor (only configured if that package is installed). [davisagli]

1.0b4 - 2009-10-12

• Update README.txt to be in line with reality. [optilude]

• Fix the @@text-transform view to work with path traversal. [optilude]

1.0b3 - 2009-10-08

• Add plone.rfc822 field marshaller. This is only configured if that package is installed. [optilude]

1.0b2 - 2009-09-21

• Store the raw value in a separate persistent object in the ZODB instead of in a BLOB. This avoids potential problems with having thousands of small BLOB files, which would not be very space efficient on many filesystems. [optilude]

• Make the RichTextValue immutable. This greatly simplifies the code and avoids the need to keep track of the parent object. [optilude]

1.0b1 - 2009-09-17

• Initial release

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