Enable Markdown and HTML notifications. (#288)

This change enable defining the notification body as HTML or Markdown. This can be very
useful to have more user-friendly notifications such as:
* applying a heading style to the `{watch_title}` to make it stand out
* creating clickable links using the `{watch_url}`, `{preview_url}` and `{diff_url}`.

Changes
=======
* Add a `notification_format` to the notification settings, defaults to plain text.
* Use the `body_format` parameter of Apprise's `notify` method.

Co-authored-by: Malo Jaffré <malo.jaffre@dunnhumby.com>

changedetectionio/__init__.py

@@ -415,6 +415,7 @@ def changedetection_app(config=None, datastore_o=None):
                           'trigger_text': form.trigger_text.data,
                           'notification_title': form.notification_title.data,
                           'notification_body': form.notification_body.data,
+                          'notification_format': form.notification_format.data,
                           'extract_title_as_title': form.extract_title_as_title.data
 
                           }
@@ -454,7 +455,8 @@ def changedetection_app(config=None, datastore_o=None):
                 n_object = {'watch_url': form.url.data.strip(),
                             'notification_urls': form.notification_urls.data,
                             'notification_title': form.notification_title.data,
-                            'notification_body' :  form.notification_body.data
+                            'notification_body' :  form.notification_body.data,
+                            'notification_format' :  form.notification_format.data,
                 }
                 notification_q.put(n_object)
 
@@ -501,6 +503,7 @@ def changedetection_app(config=None, datastore_o=None):
             form.fetch_backend.data = datastore.data['settings']['application']['fetch_backend']
             form.notification_title.data = datastore.data['settings']['application']['notification_title']
             form.notification_body.data = datastore.data['settings']['application']['notification_body']
+            form.notification_format.data = datastore.data['settings']['application']['notification_format']
             form.base_url.data = datastore.data['settings']['application']['base_url']
 
             # Password unset is a GET
@@ -519,6 +522,7 @@ def changedetection_app(config=None, datastore_o=None):
             datastore.data['settings']['application']['fetch_backend'] = form.fetch_backend.data
             datastore.data['settings']['application']['notification_title'] = form.notification_title.data
             datastore.data['settings']['application']['notification_body'] = form.notification_body.data
+            datastore.data['settings']['application']['notification_format'] = form.notification_format.data
             datastore.data['settings']['application']['notification_urls'] = form.notification_urls.data
             datastore.data['settings']['application']['base_url'] = form.base_url.data
 
@@ -526,7 +530,8 @@ def changedetection_app(config=None, datastore_o=None):
                 n_object = {'watch_url': "Test from changedetection.io!",
                             'notification_urls': form.notification_urls.data,
                             'notification_title': form.notification_title.data,
-                            'notification_body': form.notification_body.data
+                            'notification_body': form.notification_body.data,
+                            'notification_format': form.notification_format.data,
                             }
                 notification_q.put(n_object)
                 flash('Notifications queued.')

changedetectionio/forms.py

@@ -6,6 +6,8 @@ from wtforms.fields import html5
 from changedetectionio import content_fetcher
 import re
 
+from changedetectionio.notification import default_notification_format, valid_notification_formats
+
 class StringListField(StringField):
     widget = widgets.TextArea()
 
@@ -203,6 +205,7 @@ class commonSettingsForm(Form):
     notification_urls = StringListField('Notification URL List', validators=[validators.Optional(), ValidateAppRiseServers()])
     notification_title = StringField('Notification Title', default='ChangeDetection.io Notification - {watch_url}', validators=[validators.Optional(), ValidateTokensList()])
     notification_body = TextAreaField('Notification Body', default='{watch_url} had a change.', validators=[validators.Optional(), ValidateTokensList()])
+    notification_format = SelectField('Notification Format', choices=valid_notification_formats.keys(), default=default_notification_format)
     trigger_check = BooleanField('Send test notification on save')
     fetch_backend = RadioField(u'Fetch Method', choices=content_fetcher.available_fetchers(), validators=[ValidateContentFetcherIsReady()])
     extract_title_as_title = BooleanField('Extract <title> from document and use as watch title', default=False)

changedetectionio/notification.py

@@ -1,5 +1,6 @@
 import os
 import apprise
+from apprise import NotifyFormat
 
 valid_tokens = {
     'base_url': '',
@@ -12,6 +13,13 @@ valid_tokens = {
     'current_snapshot': ''
 }
 
+valid_notification_formats = {
+    'Text': NotifyFormat.TEXT,
+    'Markdown': NotifyFormat.MARKDOWN,
+    'HTML': NotifyFormat.HTML,
+}
+
+default_notification_format = 'Text'
 
 def process_notification(n_object, datastore):
     import logging
@@ -27,6 +35,11 @@ def process_notification(n_object, datastore):
     # Get the notification body from datastore
     n_body = n_object['notification_body']
     n_title = n_object['notification_title']
+    n_format = valid_notification_formats.get(
+        n_object['notification_format'],
+        valid_notification_formats[default_notification_format],
+    )
+
 
     # Insert variables into the notification content
     notification_parameters = create_notification_parameters(n_object, datastore)
@@ -39,7 +52,8 @@ def process_notification(n_object, datastore):
 
     apobj.notify(
         body=n_body,
-        title=n_title
+        title=n_title,
+        body_format=n_format,
     )
 
 # Notification title + body content parameters get created here.

changedetectionio/store.py

@@ -47,6 +47,7 @@ class ChangeDetectionStore:
                     # Custom notification content
                     'notification_title': None,
                     'notification_body': None,
+                    'notification_format': None,
                 }
             }
         }
@@ -73,6 +74,7 @@ class ChangeDetectionStore:
             'notification_urls': [], # List of URLs to add to the notification Queue (Usually AppRise)
             'notification_title': None,
             'notification_body': None,
+            'notification_format': None,
             'css_filter': "",
             'trigger_text': [],  # List of text or regex to wait for until a change is detected
             'fetch_backend': None,

changedetectionio/templates/_common_fields.jinja

@@ -24,6 +24,10 @@
                                 {{ render_field(form.notification_body , rows=5) }}
                                 <span class="pure-form-message-inline">Body for all notifications</span>
                             </div>
+                            <div class="pure-control-group">
+                                {{ render_field(form.notification_format , rows=5) }}
+                                <span class="pure-form-message-inline">Format for all notifications</span>
+                            </div>
                             <div class="pure-controls">
                             <span class="pure-form-message-inline">
                                 These tokens can be used in the notification body and title to

changedetectionio/tests/test_notification.py

@@ -56,6 +56,7 @@ def test_check_notification(client, live_server):
                                    "Diff URL: {diff_url}\n"
                                    "Snapshot: {current_snapshot}\n"
                                    ":-)",
+              "notification_format": "Text",
               "url": test_url,
               "tag": "my tag",
               "title": "my title",
@@ -181,6 +182,7 @@ def test_check_notification(client, live_server):
         url_for("settings_page"),
         data={"notification_title": "New ChangeDetection.io Notification - {watch_url}",
               "notification_body": "Rubbish: {rubbish}\n",
+              "notification_format": "Text",
               "notification_urls": "json://foobar.com",
               "minutes_between_check": 180,
               "fetch_backend": "html_requests"

changedetectionio/update_worker.py

@@ -87,6 +87,7 @@ class update_worker(threading.Thread):
                                         n_object['notification_urls'] = watch['notification_urls']
                                         n_object['notification_title'] = watch['notification_title']
                                         n_object['notification_body'] = watch['notification_body']
+                                        n_object['notification_format'] = watch['notification_format']
                                         self.notification_q.put(n_object)
 
                                     # No? maybe theres a global setting, queue them all
@@ -95,6 +96,7 @@ class update_worker(threading.Thread):
                                         n_object['notification_urls'] = self.datastore.data['settings']['application']['notification_urls']
                                         n_object['notification_title'] = self.datastore.data['settings']['application']['notification_title']
                                         n_object['notification_body'] = self.datastore.data['settings']['application']['notification_body']
+                                        n_object['notification_format'] = self.datastore.data['settings']['application']['notification_format']
                                         self.notification_q.put(n_object)
                                     else:
                                         print(">>> NO notifications queued, watch and global notification URLs were empty.")