Added configurable Matomo stats collection.

config/benthobsdash_config.toml

@@ -14,3 +14,8 @@ url_base_pathname='/benthobsdash/'
 [server]
 debug=true
 host='127.0.0.1'
+
+[matomo]
+tracker_url='https://matomo.yourdomain.com/'
+site_id='123'
+

src/assets/js/collect-matomo.js

+window.addEventListener("load", (event) => {
+    let tracker_url = document.querySelector('meta[property="matomo-tracker-url"]').content;
+    let site_id = document.querySelector('meta[property="matomo-site-id"]').content;
+    if (tracker_url != null && tracker_url != "" && site_id != null && site_id != "") {
+        let _paq = window._paq = window._paq || [];
+        /* tracker methods like "setCustomDimension" should be called before "trackPageView" */
+        _paq.push(['trackPageView']);
+        _paq.push(['enableLinkTracking']);
+        (function() {
+            let u=tracker_url;
+            _paq.push(['setTrackerUrl', u+'matomo.php']);
+            _paq.push(['setSiteId', site_id]);
+            let d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
+            g.async=true; g.src=u+'matomo.js'; s.parentNode.insertBefore(g,s);
+        })();
+    }
+});
+

src/dash_app.py

-from dash import Dash, html, dcc
+from dash import clientside_callback, Dash, html, Input, Output
 import dash
 import dash_bootstrap_components as dbc
 import toml
 import argparse
 
 import benthobs_data_tools as bdt
+import logging
+
+LOGGER = logging.getLogger(__name__)
+LOGGER.setLevel(logging.DEBUG)
 
 
 def build_app(config):
@@ -16,11 +20,24 @@ def build_app(config):
 
     :return: The constructed Dash application.
     """
+
+    matomo_tracker_url = ''
+    matomo_site_id = ''
+    if 'matomo' in config and 'tracker_url' in config['matomo'] and 'site_id' in config['matomo']:
+        LOGGER.debug(
+            f"Initializing Matomo collector with tracker url {config['matomo']['tracker_url']} and site id {config['matomo']['site_id']}")
+        matomo_tracker_url = config['matomo']['tracker_url']
+        matomo_site_id = config['matomo']['site_id']
+    else:
+        LOGGER.debug(f"Matomo configuration missing or incomplete. Skipping.")
+
     app = Dash('benthobsdash',
                title="BenthOBS SNO Data Viewer",
                external_stylesheets=[dbc.themes.YETI, dbc.icons.BOOTSTRAP],
                meta_tags=[
                    {"name": "viewport", "content": "width=device-width, initial-scale=1"},
+                   {"property": "matomo-tracker-url", "content": matomo_tracker_url},
+                   {"property": "matomo-site-id", "content": matomo_site_id},
                ],
                use_pages=True,
                **config['webapp']