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Description:

wagtailhallo 0.1.0

Wagtail Hallo - Rich Text Editor

This is the legacy rich text editor for the Wagtail CMS. Based on Hallo.js.
As of Wagtail 2.0, the hallo.js editor is deprecated.
Status This package should be compatible with Wagtail 2.17 and earlier versions. However, it will no longer receive bug fixes or be actively maintained. Pull requests will be accepted and if maintainers wish to support this outside of the core Wagtail team, please raise an issue to discuss this.
Major risks of using this package

Please be aware of the known hallo.js issues should you want to keep using it.
Hallo.js has inappropriate handling of HTML and editor input – it is not reliable, has browser-specific inconsistent behavior, is not a good user experience and is not accessible.
This package is a source of security concerns (XSS injections, not CSP compatible) and allows injection of undesirable content or formatting (e.g. images in headings, or headings in lists).
There is no guarantee that this package will be compatible with Wagtail beyond the supported versions listed above.

Release Notes

See the Changelog.

Supported Versions

Python 3.7, 3.8, 3.9
Django 3.2. 4.0
Wagtail 2.15, 2.16, 3.0

Installing the Hallo Editor

pip install wagtail-hallo
Add 'wagtail_hallo' to your settings.py INSTALLED_APPS

To use wagtail-hallo on Wagtail 2.x, add the following to your settings:
WAGTAILADMIN_RICH_TEXT_EDITORS = {
'hallo': {
'WIDGET': 'wagtail_hallo.hallo.HalloRichTextArea'
}
}

Using the Hallo Editor in RichTextField
# models.py
from wagtail.admin.edit_handlers import FieldPanel
from wagtail.core.fields import RichTextField
from wagtail.core.models import Page

class MyHalloPage(Page):
body = RichTextField(editor='hallo')

content_panels = Page.content_panels + [
FieldPanel('body', classname='full'),
]

{% extends "base.html" %}
{% load wagtailcore_tags wagtailimages_tags %}

{% block content %}
{% include "base/include/header.html" %}
<div class="container">
<div class="row">
<div class="col-md-7">{{ page.body|richtext }}</div>
</div>
</div>
{% endblock content %}

Using the Hallo Editor in StreamField via RichTextBlock
# models.py
from wagtail.core.models import Page
from wagtail.core.blocks import CharBlock, RichTextBlock
from wagtail.admin.edit_handlers import StreamFieldPanel
from wagtail.core.fields import StreamField

class MyOtherHalloPage(Page):
body = StreamField([
('heading', CharBlock(form_classname="full title")),
('paragraph', RichTextBlock(editor='hallo')),
], blank=True)

content_panels = Page.content_panels + [
StreamFieldPanel('body'),
]

{% extends "base.html" %}
{% load wagtailcore_tags wagtailimages_tags %}

{% block content %}
{% include "base/include/header.html" %}
<div class="container">
<div class="row">
<div class="col-md-7">{{ page.body }}</div>
</div>
</div>
{% endblock content %}

Extending the Hallo Editor
The legacy hallo.js editor’s functionality can be extended through plugins. For information on developing custom hallo.js plugins, see the project's page: https://github.com/bergie/hallo.
Once the plugin has been created, it should be registered through the feature registry's register_editor_plugin(editor, feature_name, plugin) method. For a hallo.js plugin, the editor parameter should always be 'hallo'.
A plugin halloblockquote, implemented in myapp/js/hallo-blockquote.js, that adds support for the <blockquote> tag, would be registered under the feature name block-quote as follows:
from wagtail.core import hooks
from wagtail_hallo.plugins import HalloPlugin

@hooks.register('register_rich_text_features')
def register_embed_feature(features):
features.register_editor_plugin(
'hallo', 'block-quote',
HalloPlugin(
name='halloblockquote',
js=['myapp/js/hallo-blockquote.js'],
)
)

The constructor for HalloPlugin accepts the following keyword arguments:

name - the plugin name as defined in the JavaScript code. hallo.js plugin names are prefixed with the "IKS." namespace, but the name passed here should be without the prefix.
options - a dictionary (or other JSON-serialisable object) of options to be passed to the JavaScript plugin code on initialisation
js - a list of JavaScript files to be imported for this plugin, defined in the same way as a Django form media definition
css - a dictionary of CSS files to be imported for this plugin, defined in the same way as a Django form media definition
order - an index number (default 100) specifying the order in which plugins should be listed, which in turn determines the order buttons will appear in the toolbar

When writing the front-end code for the plugin, Wagtail’s Hallo implementation offers two extension points:

In JavaScript, use the [data-hallo-editor] attribute selector to target the editor, eg. var editor = document.querySelector('[data-hallo-editor]');.
In CSS, use the .halloeditor class selector.

Whitelisting rich text elements
After extending the editor to support a new HTML element, you'll need to add it to the whitelist of permitted elements - Wagtail's standard behaviour is to strip out unrecognised elements, to prevent editors from inserting styles and scripts (either deliberately, or inadvertently through copy-and-paste) that the developer didn't account for.
Elements can be added to the whitelist through the feature registry's register_converter_rule(converter, feature_name, ruleset) method. When the hallo.js editor is in use, the converter parameter should always be 'editorhtml'.
The following code will add the <blockquote> element to the whitelist whenever the block-quote feature is active:
from wagtail.admin.rich_text.converters.editor_html import WhitelistRule
from wagtail.core.whitelist import allow_without_attributes

@hooks.register('register_rich_text_features')
def register_blockquote_feature(features):
features.register_converter_rule('editorhtml', 'block-quote', [
WhitelistRule('blockquote', allow_without_attributes),
])

WhitelistRule is passed the element name, and a callable which will perform some kind of manipulation of the element whenever it is encountered. This callable receives the element as a BeautifulSoup Tag object.
The wagtail.core.whitelist module provides a few helper functions to assist in defining these handlers: allow_without_attributes, a handler which preserves the element but strips out all of its attributes, and attribute_rule which accepts a dict specifying how to handle each attribute, and returns a handler function. This dict will map attribute names to either True (indicating that the attribute should be kept), False (indicating that it should be dropped), or a callable (which takes the initial attribute value and returns either a final value for the attribute, or None to drop the attribute).
Contributing
All contributions are welcome as the Wagtail core team will no longer be actively maintaining this project.
Development instructions

To make changes to this project, first clone this repository git clone git@github.com:wagtail/wagtail-hallo.git.

Python (Django / Wagtail)

pip3 install -e ../path/to/wagtail-hallo/ -> this installs the package locally as editable
Ensure 'wagtail_hallo' is added to your settings.py INSTALLED_APPS
You will need to have a test application (e.g. Bakery Demo) and have a Page model to work with, along with a template.

see test/testapp/models.py for a reference model
see test/testapp/templates/hallo_test_page.html for a reference template

After creating the model, remember to run python manage.py makemigrations and python manage.py migrate
Run tests python testmanage.py test
Run migrations for test models django-admin makemigrations --settings=wagtail_hallo.test.settings
Run linting flake8 wagtail_hallo
Run formatting black wagtail_hallo

JavaScript & CSS (Frontend)
Currently the frontend tooling is based on Node & NPM and is only used to format and check code. This repository intentionally does not use any build tools and as such JavaScript and CSS must be written without that requirement.

nvm use - Ensures you are on the right node version
npm install --no-save - Install NPM packages
npm run fix - Parses through JS/CSS files to fix anything it can
npm run lint - Runs linting
npm run format - Runs Prettier formatting on most files (non-Python)
npm test - Runs tests (Jest)
npm run preflight - Runs all the linting/formatting/jest checks and must be done before committing code

Release checklist

Update VERSION in wagtail_hallo/__init__.py
Update tox.ini, setup.py, README.md, package.json and workflows/ci.yml with new supported Python, Django, or Wagtail versions
Run npm install to ensure the package-lock.json is updated
Update classifiers (e.g. "Development Status :: # - Alpha" based on status (# being a number) in setup.py
Update setup.py with new release version
Update CHANGELOG.md with the release date
Push to PyPI

pip install twine
python3 setup.py clean --all sdist bdist_wheel
twine upload dist/* <-- pushes to PyPI

Create a stable release branch (e.g. stable/1.0.x)
Add a Github release (e.g. v1.0.0)

Thanks
Many thanks to all of our supporters, contributors, and users of Wagtail who built upon the amazing Hallo.js editor. We are thankful to the Wagtail core team and developers at Torchbox who sponsored the majority of the initial development. Thank you to LB, who transferred the Hallo.js integration from Wagtail to the wagtail-hallo package. And a very special thanks to the original creator of the Hallo.js editor.