Instead of passing the template strings for subject and body when
constructing a notification, we pass only the name of a template.
When rendering the template, the name of the template is used to find
corresponding template files. For PVE, they are located at
/usr/share/proxmox-ve/templates/default. The `default` part is
the 'template namespace', which is a preparation for user-customizable
and/or translatable notifications.
Previously, the same template string was used to render HTML and
plaintext notifications. This was achieved by providing some template
helpers that 'abstract away' HTML/plaintext formatting. However,
in hindsight this turned out to be pretty finicky. Since the
current changes lay the foundations for user-customizable notification
templates, I ripped these abstractions out. Now there are simply two
templates, one for plaintext, one for HTML.
Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
Tested-by: Folke Gleumes <f.gleumes@proxmox.com>
Reviewed-by: Fiona Ebner <f.ebner@proxmox.com>
This commit has the aim of making template rendering a bit more
robust. It does so by a.) Accepting also strings for helpers that
expect a number, parsing the number if needed, and b.) Ignoring errors
if a template helper fails to render a value and showing an error in
the logs, instead of failing to render the whole template (leading
to no notification being sent).
Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
This commit adds template rendering to the `proxmox-notify` crate, based
on the `handlebars` crate.
Title and body of a notification are rendered using any `properties`
passed along with the notification. There are also a few helpers,
allowing to render tables from `serde_json::Value`.
'Value' renderers. These can also be used in table cells using the
'renderer' property in a table schema:
- {{human-bytes val}}
Render bytes with human-readable units (base 2)
- {{duration val}}
Render a duration (based on seconds)
- {{timestamp val}}
Render a unix-epoch (based on seconds)
There are also a few 'block-level' helpers.
- {{table val}}
Render a table from given val (containing a schema for the columns,
as well as the table data)
- {{object val}}
Render a value as a pretty-printed json
- {{heading_1 val}}
Render a top-level heading
- {{heading_2 val}}
Render a not-so-top-level heading
- {{verbatim val}} or {{/verbatim}}<content>{{#verbatim}}
Do not reflow text. NOP for plain text, but for HTML output the text
will be contained in a <pre> with a regular font.
- {{verbatim-monospaced val}} or
{{/verbatim-monospaced}}<content>{{#verbatim-monospaced}}
Do not reflow text. NOP for plain text, but for HTML output the text
will be contained in a <pre> with a monospaced font.
Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
