Dockerfile

@@ -1,5 +1,5 @@
 FROM python:3.11-alpine
-RUN python3 -m pip --no-cache-dir install bleach jinja2 markdown matrix-nio
+RUN python3 -m pip --no-cache-dir install bleach markdown matrix-nio
 ADD matrixchat-notify.py /bin/
 ADD matrixchat-notify-config.json /etc/
 RUN chmod +x /bin/matrixchat-notify.py

README.md

@@ -40,7 +40,7 @@ steps:
 * `allowed_tags` *(default:* [`DEFAULT_ALLOWED_TAGS`]*)*
 
     List or set or string with comma-separated list of HTML tag names. HTML
-    tags not included will be stripped from the HTML output generated by
+    tags not included, will be stripped from the HTML output generated by
     rendering a Markdown message template.
 
     Note that the default list does not include any tags, which allow to load
@@ -64,28 +64,11 @@ steps:
 
     The Matrix homeserver URL.
 
-* `jinja`
-
-    If set to `yes`, `y`, `true`, `t`, `on` or `1`, the message template is
-    rendered with the [Jinja] templating engine (instead of performing simple
-    placeholder substitution). The template context is controlled by the
-    `pass_environment` setting, same as with non-Jinja templates, but
-    placeholders use a different syntax (example: `{{DRONE_REPO}}`), so the
-    `template` setting should be changed to be a valid Jinja2 template string
-    when this is enabled.
-
-    Using this feature requires the `jinja2` Python module to be available
-    (it is installed by default in the plugin's docker image).
-
 * `markdown`
 
-    If set to `yes`, `y`, `true`, `t`, `on` or `1`, the message resulting from
-    template substtution is considered to be in Markdown format and will be
-    rendered to HTML and sent as a formatted message with the format set to
-    `org.matrix.custom.html`.
-
-    Using this feature requires the `markdown` and `bleach` Python modules to
-    be available (they are installed by default in the plugin's docker image).
+    If set to `yes`, `y`, `true` or `on`, the message resulting from template
+    substtution is considered to be in Markdown format and will be rendered to
+    HTML and sent as a formatted message with `org.matrix.custom.html` format.
 
 * `markdown_extensions` *(default:* `admonition, extra, sane_lists, smarty`)
 
@@ -112,9 +95,9 @@ steps:
 
 * `template` *(default:* `${DRONE_BUILD_STATUS}`*)*
 
-    The message template. Valid placeholders (example: `${DRONE_REPO}`) will be
-    substituted with the values of the matching environment variables (subject
-    to filtering according to the `pass_environment` setting).
+    The message template. Valid placeholders of the form `${PLACEHOLDER}` will
+    be substituted with the values of the matching environment variables
+    (subject to filtering according to the `pass_environment` setting).
 
     See this [reference] for environment variables available in drone.io CI
     pipelines.
@@ -124,11 +107,10 @@ steps:
     ID of user on homeserver to send message as (ID, not username).
 
 
-[`DEFAULT_ALLOWED_ATTRS`]: ./matrixchat-notify.py#L27
-[`DEFAULT_ALLOWED_TAGS`]: ./matrixchat-notify.py#L34
+[`DEFAULT_ALLOWED_ATTRS`]: ./matrixchat-notify.py#L29
+[`DEFAULT_ALLOWED_TAGS`]: ./matrixchat-notify.py#L35
 [allowed attributes]: https://bleach.readthedocs.io/en/latest/clean.html#allowed-attributes-attributes
 [drone.io]: https://drone.io/
-[jinja]: https://jinja.palletsprojects.com/
 [list of extensions]: https://python-markdown.github.io/extensions/
 [plugin]: https://docs.drone.io/plugins/overview/
 [reference]:  https://docs.drone.io/pipeline/environment/reference/

matrixchat-notify.py

@@ -5,7 +5,6 @@ Requires:
 
 * <https://pypi.org/project/matrix-nio>
 * Optional: <https://pypi.org/project/bleach/>
-* Optional: <https://pypi.org/project/Jinja2/>
 * Optional: <https://pypi.org/project/markdown/>
 
 """
@@ -21,47 +20,36 @@ from distutils.util import strtobool
 from os.path import exists
 from string import Template
 
+import bleach
 from nio import AsyncClient, LoginResponse
 
 PROG = "matrixchat-notify"
 CONFIG_FILENAME = f"{PROG}-config.json"
-DEFAULT_ALLOWED_ATTRS = {
+DEFAULT_ALLOWED_ATTRS = bleach.ALLOWED_ATTRIBUTES.copy()
+DEFAULT_ALLOWED_ATTRS.update(
+    {
         "*": ["class"],
-    "a": ["href", "title"],
-    "abbr": ["title"],
-    "acronym": ["title"],
         "img": ["alt", "src"],
-}
-DEFAULT_ALLOWED_TAGS = {
-    "a",
-    "abbr",
-    "acronym",
-    "b",
-    "blockquote",
-    "code",
+    }
+)
+DEFAULT_ALLOWED_TAGS = bleach.ALLOWED_TAGS | {
     "dd",
     "div",
     "dl",
     "dt",
-    "em",
     "h1",
     "h2",
     "h3",
     "h4",
     "h5",
     "h6",
-    "i",
-    "li",
-    "ol",
     "p",
     "span",
-    "strong",
     "table",
     "td",
     "th",
     "thead",
     "tr",
-    "ul",
 }
 DEFAULT_HOMESERVER = "https://matrix.org"
 DEFAULT_MARKDOWN_EXTENSIONS = "admonition, extra, sane_lists, smarty"
@@ -74,7 +62,6 @@ SETTINGS_KEYS = (
     "deviceid",
     "devicename",
     "homeserver",
-    "jinja",
     "markdown",
     "markdown_extensions",
     "pass_environment",
@@ -88,7 +75,7 @@ log = logging.getLogger(PROG)
 
 def tobool(s):
     try:
-        return strtobool(str(s))
+        return strtobool(s)
     except ValueError:
         return False
 
@@ -158,15 +145,15 @@ async def send_notification(config, message):
     await client.close()
 
 
-def get_template_context(config):
-    pass_environment = config.get("pass_environment", [])
+def render_message(config):
+    pass_environment = config.get("pass_environment", "")
 
     if not isinstance(pass_environment, list):
         pass_environment = [pass_environment]
 
     patterns = []
     for value in pass_environment:
-        # expand any comma-separated names/patterns
+        # expand any comma-separetd names/patterns
         if "," in value:
             patterns.extend([p.strip() for p in value.split(",") if p.strip()])
         else:
@@ -178,28 +165,12 @@ def get_template_context(config):
     for pattern in patterns:
         filtered_names.update(fnmatch.filter(env_names, pattern))
 
-    return {name: os.environ[name] for name in tuple(filtered_names)}
-
-
-def render_message(config):
-    context = get_template_context(config)
+    context = {name: os.environ[name] for name in tuple(filtered_names)}
     template = config.get("template", DEFAULT_TEMPLATE)
-
-    if tobool(config.get("jinja")):
-        try:
-            from jinja2.sandbox import SandboxedEnvironment
-
-            env = SandboxedEnvironment()
-            return env.from_string(template).render(context)
-        except Exception as exc:
-            log.error("Could not render Jinja2 template: %s", exc)
-            return template
-    else:
     return Template(template).safe_substitute(context)
 
 
 def render_markdown(message, config):
-    import bleach
     import markdown
 
     allowed_attrs = config.get("allowed_attrs", DEFAULT_ALLOWED_ATTRS)