Startup script to create Grafana based kiosks.

grafana-kiosk

#!/bin/bash

# Copyright (c) 2019 Gonçalo Baltazar <[email protected]>
# MIT License

# Grafana Dashboard Kiosk using Google Chrome (or Chromium)

# opens an independent google chrome instance with a custom
# extension that injects Authorization headers for grafana

# GRAFANA_KIOSK_URL and GRAFANA_KIOSK_API_KEY are required

# GRAFANA_KIOSK_URL="https://example.com/grafana/"
# GRAFANA_KIOSK_URL_PATH="/d/..."
# GRAFANA_KIOSK_API_KEY="(grafana api key)"
# GRAFANA_KIOSK_CHROME="google-chrome"

[ -z "$GRAFANA_KIOSK_URL" ] && echo "Missing 'GRAFANA_KIOSK_URL'." && exit 1
[ -z "$GRAFANA_KIOSK_URL_PATH" ] && GRAFANA_KIOSK_URL_PATH="/"
[ -z "$GRAFANA_KIOSK_API_KEY" ] && echo "Missing 'GRAFANA_KIOSK_API_KEY'." && exit 1
[ -z "$GRAFANA_KIOSK_CHROME" ] && GRAFANA_KIOSK_CHROME="google-chrome"

CHROME_USER_DATA=$(mktemp -d)
touch "$CHROME_USER_DATA/First Run"

CHROME_EXTENSION=$(mktemp -d)
cat > "$CHROME_EXTENSION/manifest.json" <<EOF
{
    "name": "Grafana Kiosk",
    "version": "1.0",
    "manifest_version": 2,
    "permissions": [
        "webRequest",
        "webRequestBlocking",
        "$GRAFANA_KIOSK_URL/*"
    ],
    "background": {
        "scripts": ["background.js"]
    }
}
EOF
cat > "$CHROME_EXTENSION/background.js" <<EOF
(function() {
    const networkFilters = {
        urls: [
            "$GRAFANA_KIOSK_URL/*"
        ].map(url => url.replace(/:?\/+/g, (s) => s[0] == ":" ? s : "/"))
    };
    chrome.webRequest.onBeforeSendHeaders.addListener((details) => {
        details.requestHeaders.push({
            name: "Authorization",
            value: "Bearer $GRAFANA_KIOSK_API_KEY"
        });
        return { requestHeaders: details.requestHeaders };
    }, networkFilters, ["blocking", "requestHeaders"]);
}());
EOF

"$GRAFANA_KIOSK_CHROME" \
    --user-data-dir="$CHROME_USER_DATA" \
    --password-store=basic \
    --load-extension="$CHROME_EXTENSION" \
    --disable-extensions-except="$CHROME_EXTENSION" \
    --disable-translate \
    --start-maximized \
    --kiosk \
    "$GRAFANA_KIOSK_URL$GRAFANA_KIOSK_URL_PATH"

rm -rf "$CHROME_USER_DATA"
rm -rf "$CHROME_EXTENSION"