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Full: add server list and autologin plugins via env vars (#73)
Two standalone Adminer plugins activated by env vars at container startup: - ADMINER_AUTOLOGIN_SERVER=driver://user:pass@host:port/db Skips login form, connects directly. Credentials handled server-side. - ADMINER_SERVERS_Name=driver://user:pass@host:port/db Server dropdown with Auto Sign-In button. Multiple servers supported. Both Login and Auto Sign-In use stored credentials server-side. Plugins use Adminer's auto-discovery (adminer-plugins/ directory). Entrypoint copies the appropriate plugin file based on env vars. Includes docker-compose.yml for easy testing with MariaDB + PostgreSQL. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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‎adminer-full/Dockerfile‎

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@@ -39,6 +39,7 @@ RUN echo '@community http://nl.alpinelinux.org/alpine/v3.22/community' >> /etc/a
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rm -rf /var/cache/apk/*
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ADD ./entrypoint.sh /entrypoint.sh
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ADD ./plugins-available/ /srv/plugins-available/
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RUN chmod +x /entrypoint.sh
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WORKDIR /srv

‎adminer-full/entrypoint.sh‎

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@@ -27,6 +27,15 @@ else
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echo "[adminer] No driver plugins directory found at /srv/plugins/drivers, skipping..."
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fi
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# Activate plugins based on env vars (autologin takes precedence over server list)
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if [ -n "${ADMINER_AUTOLOGIN_SERVER}" ]; then
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cp /srv/plugins-available/adminer-autologin.php /srv/adminer-plugins/
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echo "[adminer] Autologin plugin activated."
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elif env | grep -q '^ADMINER_SERVERS_'; then
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cp /srv/plugins-available/adminer-server-list.php /srv/adminer-plugins/
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echo "[adminer] Server list plugin activated."
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fi
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# Copy theme CSS files based on ADMINER_THEME environment variable
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if [ -n "${ADMINER_THEME}" ]; then
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THEME_DIR="/srv/designs/${ADMINER_THEME}"

‎adminer-full/plugins-available/adminer-autologin.php‎

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<?php
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/**
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* Auto-login to a single database server. Skips the login form entirely.
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*
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* Activated by: ADMINER_AUTOLOGIN_SERVER env var
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* DSN format: driver://username:password@host:port/database
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* Example: server://root:secret@mysql:3306/mydb
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*/
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class AdminerAutologin extends Adminer\Plugin {
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private $config;
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function __construct() {
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$dsn = getenv('ADMINER_AUTOLOGIN_SERVER');
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if (!$dsn || !preg_match('#^(\w+)://(?:([^:@]*)(?::([^@]*))?@)?([^/:]+)(?::(\d+))?(?:/(.*))?$#', $dsn, $m)) {
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return;
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}
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$host = $m[4] . (!empty($m[5]) ? ':' . $m[5] : '');
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$this->config = [
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'driver' => $m[1],
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'username' => urldecode($m[2] ?? ''),
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'password' => urldecode($m[3] ?? ''),
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'server' => $host,
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'db' => urldecode($m[6] ?? ''),
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];
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// Inject login data on first visit (before Adminer processes the request)
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if (!isset($_GET["username"]) && empty($_POST["auth"]) && !isset($_GET["server"])) {
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$_POST["auth"] = [
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"driver" => $this->config["driver"],
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"server" => $this->config["server"],
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"username" => $this->config["username"],
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"password" => $this->config["password"],
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"db" => $this->config["db"],
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"permanent" => "",
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];
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}
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}
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function credentials() {
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if ($this->config) {
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return [$this->config["server"], $this->config["username"], $this->config["password"]];
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}
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}
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function login($login, $password) {
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if ($this->config) {
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return true;
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}
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}
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}

‎adminer-full/plugins-available/adminer-server-list.php‎

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<?php
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/**
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* Server list with optional stored credentials and Auto Sign-In button.
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* Credentials are handled server-side — never exposed to the browser.
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*
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* Activated by: ADMINER_SERVERS_* env vars
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* DSN format: driver://username:password@host:port/database
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* Examples:
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* ADMINER_SERVERS_MariaDB=server://root:secret@mysql:3306/mydb
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* ADMINER_SERVERS_PostgreSQL=pgsql://postgres:pwd@pg:5432/app
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* ADMINER_SERVERS_SQLite=sqlite:///data/db.sqlite (no credentials)
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*
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* The suffix after ADMINER_SERVERS_ becomes the display name in the dropdown.
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*/
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class AdminerServerList extends Adminer\Plugin {
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private $servers = [];
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private $credentials = [];
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function __construct() {
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foreach (getenv() as $key => $value) {
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if (!str_starts_with($key, 'ADMINER_SERVERS_')) {
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continue;
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}
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$name = substr($key, strlen('ADMINER_SERVERS_'));
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if (!preg_match('#^(\w+)://(?:([^:@]*)(?::([^@]*))?@)?([^/:]+)(?::(\d+))?(?:/(.*))?$#', $value, $m)) {
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continue;
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}
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$host = $m[4] . (!empty($m[5]) ? ':' . $m[5] : '');
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$this->servers[$name] = ['server' => $host, 'driver' => $m[1]];
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if (!empty($m[2])) {
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$this->credentials[$name] = [
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'username' => urldecode($m[2]),
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'password' => urldecode($m[3] ?? ''),
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'db' => urldecode($m[6] ?? ''),
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];
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}
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}
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// Set driver from selected server on POST (same as AdminerLoginServers)
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if ($_POST["auth"] && isset($this->servers[$_POST["auth"]["server"]])) {
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$_POST["auth"]["driver"] = $this->servers[$_POST["auth"]["server"]]["driver"];
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}
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// Handle Auto Sign-In: inject stored credentials into POST
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if (isset($_POST["_autologin"]) && isset($this->credentials[$_POST["auth"]["server"]])) {
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$cred = $this->credentials[$_POST["auth"]["server"]];
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$_POST["auth"]["username"] = $cred["username"];
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$_POST["auth"]["password"] = $cred["password"];
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$_POST["auth"]["db"] = $cred["db"];
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}
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}
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function credentials() {
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$server = Adminer\SERVER;
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if (isset($this->servers[$server])) {
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$host = $this->servers[$server]["server"];
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if (isset($this->credentials[$server])) {
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$cred = $this->credentials[$server];
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$username = $_GET["username"] ?: $cred["username"];
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$password = Adminer\get_password() ?: $cred["password"];
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return [$host, $username, $password];
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}
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return [$host, $_GET["username"], Adminer\get_password()];
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}
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}
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function login($login, $password) {
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if (!isset($this->servers[Adminer\SERVER])) {
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return false;
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}
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if (isset($this->credentials[Adminer\SERVER])) {
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return true;
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}
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}
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function loginFormField($name, $heading, $value) {
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if ($name == 'driver') {
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return '';
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}
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if ($name == 'server') {
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return $heading . Adminer\html_select("auth[server]", array_keys($this->servers), Adminer\SERVER) . "\n";
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}
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}
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function head() {
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if (isset($_GET["username"]) || empty($this->credentials)) {
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return;
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}
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$servers = json_encode(array_keys($this->credentials), JSON_HEX_TAG | JSON_HEX_AMP);
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$nonce = \Adminer\get_nonce();
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echo <<<SCRIPT
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<script nonce="$nonce">
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(function() {
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var serversWithCreds = $servers;
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document.addEventListener("DOMContentLoaded", function() {
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var form = document.querySelector("form");
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if (!form) return;
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var serverSelect = form.querySelector('[name="auth[server]"]');
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if (!serverSelect) return;
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var hidden = document.createElement("input");
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hidden.type = "hidden";
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hidden.name = "_autologin";
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hidden.disabled = true;
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form.appendChild(hidden);
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var btn = document.createElement("input");
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btn.type = "submit";
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btn.value = "Auto Sign-In";
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btn.style.display = "none";
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btn.style.marginLeft = "5px";
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btn.addEventListener("click", function() {
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hidden.disabled = false;
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hidden.value = "1";
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});
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var loginBtn = form.querySelector('[type="submit"][value="Login"]');
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if (loginBtn) loginBtn.parentNode.insertBefore(btn, loginBtn.nextSibling);
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function updateButton(serverName) {
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btn.style.display = serversWithCreds.indexOf(serverName) >= 0 ? "inline" : "none";
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}
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serverSelect.addEventListener("change", function() { updateButton(this.value); });
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updateButton(serverSelect.value);
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});
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})();
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</script>
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SCRIPT;
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}
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}

‎docker-compose.yml‎

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services:
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adminer:
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build:
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context: adminer-full
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dockerfile: Dockerfile
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ports:
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- "8080:80"
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environment:
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# Autologin: skips login form, connects directly (takes precedence over ADMINER_SERVERS_*)
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#ADMINER_AUTOLOGIN_SERVER: "server://root:root@mariadb:3306/testdb"
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ADMINER_SERVERS_MariaDB: "server://root:root@mariadb:3306/testdb"
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ADMINER_SERVERS_PostgreSQL: "pgsql://root:root@postgres:5432/testdb"
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depends_on:
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mariadb:
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condition: service_healthy
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postgres:
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condition: service_healthy
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mariadb:
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image: mariadb:11
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environment:
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MARIADB_ROOT_PASSWORD: root
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MARIADB_DATABASE: testdb
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healthcheck:
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test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
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interval: 5s
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timeout: 3s
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retries: 10
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postgres:
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image: postgres:17-alpine
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environment:
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POSTGRES_USER: root
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POSTGRES_PASSWORD: root
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POSTGRES_DB: testdb
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healthcheck:
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test: ["CMD-SHELL", "pg_isready -U root -d testdb"]
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interval: 5s
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timeout: 3s
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retries: 10

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