All: support env-based default credentials

.github/workflows/docker.yml

@@ -21,52 +21,52 @@ jobs:
       matrix:
         include:
           - dockerfile: ./adminer-dg/Dockerfile
-            context: ./adminer-dg
+            context: .
             tag: dg
             platforms: linux/amd64,linux/arm64
 
           - dockerfile: ./adminer-editor/Dockerfile
-            context: ./adminer-editor
+            context: .
             tag: editor
             platforms: linux/amd64,linux/arm64
 
           - dockerfile: ./adminer-full/Dockerfile
-            context: ./adminer-full
+            context: .
             tag: full
             platforms: linux/amd64,linux/arm64
 
           - dockerfile: ./adminer-mongo/Dockerfile
-            context: ./adminer-mongo
+            context: .
             tag: mongo
             platforms: linux/amd64,linux/arm64
 
           - dockerfile: ./adminer-mysql/Dockerfile
-            context: ./adminer-mysql
+            context: .
             tag: mysql
             platforms: linux/amd64,linux/arm64
 
           - dockerfile: ./adminer-oracle-11/Dockerfile
-            context: ./adminer-oracle-11
+            context: .
             tag: oracle-11
             platforms: linux/amd64
 
           - dockerfile: ./adminer-oracle-12/Dockerfile
-            context: ./adminer-oracle-12
+            context: .
             tag: oracle-12
             platforms: linux/amd64
 
           - dockerfile: ./adminer-oracle-19/Dockerfile
-            context: ./adminer-oracle-19
+            context: .
             tag: oracle-19
             platforms: linux/amd64
 
           - dockerfile: ./adminer-postgres/Dockerfile
-            context: ./adminer-postgres
+            context: .
             tag: postgres
             platforms: linux/amd64,linux/arm64
 
           - dockerfile: ./adminer-full/Dockerfile
-            context: ./adminer-full
+            context: .
             tag: latest
             platforms: linux/amd64,linux/arm64
 

.plugins/adminer-autologin.php

@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * Auto-login to a single database server. Skips the login form entirely.
+ *
+ * Activated by: ADMINER_AUTOLOGIN_SERVER env var
+ * DSN format:   driver://username:password@host:port/database
+ * Example:      server://root:secret@mysql:3306/mydb
+ */
+class AdminerAutologin extends Adminer\Plugin {
+    private $config;
+
+    function __construct() {
+        $dsn = getenv('ADMINER_AUTOLOGIN_SERVER');
+        if (!$dsn || !preg_match('#^(\w+)://(?:([^:@]*)(?::([^@]*))?@)?([^/:]+)(?::(\d+))?(?:/(.*))?$#', $dsn, $m)) {
+            return;
+        }
+        $host = $m[4] . (!empty($m[5]) ? ':' . $m[5] : '');
+        $this->config = [
+            'driver' => $m[1],
+            'username' => urldecode($m[2] ?? ''),
+            'password' => urldecode($m[3] ?? ''),
+            'server' => $host,
+            'db' => urldecode($m[6] ?? ''),
+        ];
+
+        // Inject login data on first visit (before Adminer processes the request)
+        if (!isset($_GET["username"]) && empty($_POST["auth"]) && !isset($_GET["server"])) {
+            $_POST["auth"] = [
+                "driver" => $this->config["driver"],
+                "server" => $this->config["server"],
+                "username" => $this->config["username"],
+                "password" => $this->config["password"],
+                "db" => $this->config["db"],
+                "permanent" => "",
+            ];
+        }
+    }
+
+    function credentials() {
+        if ($this->config) {
+            return [$this->config["server"], $this->config["username"], $this->config["password"]];
+        }
+    }
+
+    function login($login, $password) {
+        if ($this->config) {
+            return true;
+        }
+    }
+}

.plugins/adminer-server-list.php

@@ -0,0 +1,130 @@
+<?php
+
+/**
+ * Server list with optional stored credentials and Auto Sign-In button.
+ * Credentials are handled server-side — never exposed to the browser.
+ *
+ * Activated by: ADMINER_SERVERS_* env vars
+ * DSN format:   driver://username:password@host:port/database
+ * Examples:
+ *   ADMINER_SERVERS_MariaDB=server://root:secret@mysql:3306/mydb
+ *   ADMINER_SERVERS_PostgreSQL=pgsql://postgres:pwd@pg:5432/app
+ *   ADMINER_SERVERS_SQLite=sqlite:///data/db.sqlite  (no credentials)
+ *
+ * The suffix after ADMINER_SERVERS_ becomes the display name in the dropdown.
+ */
+class AdminerServerList extends Adminer\Plugin {
+    private $servers = [];
+    private $credentials = [];
+
+    function __construct() {
+        foreach (getenv() as $key => $value) {
+            if (!str_starts_with($key, 'ADMINER_SERVERS_')) {
+                continue;
+            }
+            $name = substr($key, strlen('ADMINER_SERVERS_'));
+            if (!preg_match('#^(\w+)://(?:([^:@]*)(?::([^@]*))?@)?([^/:]+)(?::(\d+))?(?:/(.*))?$#', $value, $m)) {
+                continue;
+            }
+            $host = $m[4] . (!empty($m[5]) ? ':' . $m[5] : '');
+            $this->servers[$name] = ['server' => $host, 'driver' => $m[1]];
+            if (!empty($m[2])) {
+                $this->credentials[$name] = [
+                    'username' => urldecode($m[2]),
+                    'password' => urldecode($m[3] ?? ''),
+                    'db' => urldecode($m[6] ?? ''),
+                ];
+            }
+        }
+
+        // Set driver from selected server on POST (same as AdminerLoginServers)
+        if ($_POST["auth"] && isset($this->servers[$_POST["auth"]["server"]])) {
+            $_POST["auth"]["driver"] = $this->servers[$_POST["auth"]["server"]]["driver"];
+        }
+
+        // Handle Auto Sign-In: inject stored credentials into POST
+        if (isset($_POST["_autologin"]) && isset($this->credentials[$_POST["auth"]["server"]])) {
+            $cred = $this->credentials[$_POST["auth"]["server"]];
+            $_POST["auth"]["username"] = $cred["username"];
+            $_POST["auth"]["password"] = $cred["password"];
+            $_POST["auth"]["db"] = $cred["db"];
+        }
+    }
+
+    function credentials() {
+        $server = Adminer\SERVER;
+        if (isset($this->servers[$server])) {
+            $host = $this->servers[$server]["server"];
+            if (isset($this->credentials[$server])) {
+                $cred = $this->credentials[$server];
+                $username = $_GET["username"] ?: $cred["username"];
+                $password = Adminer\get_password() ?: $cred["password"];
+                return [$host, $username, $password];
+            }
+            return [$host, $_GET["username"], Adminer\get_password()];
+        }
+    }
+
+    function login($login, $password) {
+        if (!isset($this->servers[Adminer\SERVER])) {
+            return false;
+        }
+        if (isset($this->credentials[Adminer\SERVER])) {
+            return true;
+        }
+    }
+
+    function loginFormField($name, $heading, $value) {
+        if ($name == 'driver') {
+            return '';
+        }
+        if ($name == 'server') {
+            return $heading . Adminer\html_select("auth[server]", array_keys($this->servers), Adminer\SERVER) . "\n";
+        }
+    }
+
+    function head() {
+        if (isset($_GET["username"]) || empty($this->credentials)) {
+            return;
+        }
+        $servers = json_encode(array_keys($this->credentials), JSON_HEX_TAG | JSON_HEX_AMP);
+        $nonce = \Adminer\get_nonce();
+        echo <<<SCRIPT
+<script nonce="$nonce">
+(function() {
+    var serversWithCreds = $servers;
+    document.addEventListener("DOMContentLoaded", function() {
+        var form = document.querySelector("form");
+        if (!form) return;
+        var serverSelect = form.querySelector('[name="auth[server]"]');
+        if (!serverSelect) return;
+
+        var hidden = document.createElement("input");
+        hidden.type = "hidden";
+        hidden.name = "_autologin";
+        hidden.disabled = true;
+        form.appendChild(hidden);
+
+        var btn = document.createElement("input");
+        btn.type = "submit";
+        btn.value = "Auto Sign-In";
+        btn.style.display = "none";
+        btn.style.marginLeft = "5px";
+        btn.addEventListener("click", function() {
+            hidden.disabled = false;
+            hidden.value = "1";
+        });
+        var loginBtn = form.querySelector('[type="submit"][value="Login"]');
+        if (loginBtn) loginBtn.parentNode.insertBefore(btn, loginBtn.nextSibling);
+
+        function updateButton(serverName) {
+            btn.style.display = serversWithCreds.indexOf(serverName) >= 0 ? "inline" : "none";
+        }
+        serverSelect.addEventListener("change", function() { updateButton(this.value); });
+        updateButton(serverSelect.value);
+    });
+})();
+</script>
+SCRIPT;
+    }
+}

Makefile

@@ -5,7 +5,7 @@ build-all: build-full build-dg build-editor build-mongo build-mysql build-postgr
 
 _docker-build-%: TAG=$*
 _docker-build-%:
-	docker buildx build --platform ${DOCKER_PLATFORMS} -t ${DOCKER_IMAGE}:${TAG} ./adminer-${TAG}
+	docker buildx build --platform ${DOCKER_PLATFORMS} -t ${DOCKER_IMAGE}:${TAG} -f ./adminer-${TAG}/Dockerfile .
 
 build-full: _docker-build-full
 build-dg: _docker-build-dg

README.md

@@ -80,6 +80,56 @@ You should take a look to the official github profile (https://github.com/dg/adm
 
 ![Adminer DG](.docs/assets/adminer-dg.png)
 
+## Plugins
+
+Adminer plugins can be enabled via environment variables. All plugins are disabled by default. Available for all image variants except `dg`.
+
+### Autologin
+
+Skips the login form and connects directly to a database server.
+
+| Variable | Description |
+|---|---|
+| `ADMINER_PLUGIN_AUTOLOGIN=1` | Enable the autologin plugin |
+| `ADMINER_AUTOLOGIN_SERVER` | DSN connection string |
+
+DSN format: `driver://username:password@host:port/database`
+
+```sh
+docker run \
+    --rm \
+    -p 8080:80 \
+    -e ADMINER_PLUGIN_AUTOLOGIN=1 \
+    -e ADMINER_AUTOLOGIN_SERVER=server://root:secret@mysql:3306/mydb \
+    dockette/adminer:full
+```
+
+Supported drivers: `server` (MySQL/MariaDB), `pgsql`, `sqlite`, `mongo`, `oracle`, `elastic`.
+
+### Server List
+
+Displays a dropdown of pre-configured database servers with an **Auto Sign-In** button. Credentials are handled server-side and never exposed to the browser.
+
+| Variable | Description |
+|---|---|
+| `ADMINER_PLUGIN_SERVER_LIST=1` | Enable the server list plugin |
+| `ADMINER_SERVERS_<Name>` | DSN for each server (suffix becomes the display name) |
+
+```sh
+docker run \
+    --rm \
+    -p 8080:80 \
+    -e ADMINER_PLUGIN_SERVER_LIST=1 \
+    -e ADMINER_SERVERS_MySQL=server://root:secret@mysql:3306/mydb \
+    -e ADMINER_SERVERS_PostgreSQL=pgsql://postgres:pwd@pg:5432/app \
+    -e ADMINER_SERVERS_DevDB=server://dev@devhost:3306 \
+    dockette/adminer:full
+```
+
+Servers without credentials in the DSN (e.g. `server://devhost:3306`) appear in the dropdown but require manual login. The **Auto Sign-In** button only appears for servers with stored credentials.
+
+> **Note:** Autologin takes precedence over Server List. If both plugins are enabled, only Autologin is activated.
+
 ## Themes
 
 You can apply a theme by setting the `ADMINER_THEME` environment variable:

adminer-dg/Dockerfile

@@ -30,7 +30,7 @@ RUN echo '@community http://nl.alpinelinux.org/alpine/v3.22/community' >> /etc/a
     apk del wget ca-certificates && \
     rm -rf /var/cache/apk/*
 
-ADD ./entrypoint.sh /entrypoint.sh
+ADD ./adminer-dg/entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
 WORKDIR /srv

adminer-editor/Dockerfile

@@ -30,11 +30,13 @@ RUN echo '@community http://nl.alpinelinux.org/alpine/v3.22/community' >> /etc/a
     mkdir -p /srv/designs && \
     mv /tmp/adminer-$ADMINER_EDITOR_VERSION/designs/* /srv/designs/ 2>/dev/null || true && \
     rm -rf /tmp/* && \
+    mkdir -p /srv/adminer-plugins && \
     ln -s /usr/bin/php84 /usr/bin/php && \
     apk del wget unzip ca-certificates && \
     rm -rf /var/cache/apk/*
 
-ADD ./entrypoint.sh /entrypoint.sh
+ADD ./adminer-editor/entrypoint.sh /entrypoint.sh
+ADD ./.plugins/ /srv/plugins-available/
 RUN chmod +x /entrypoint.sh
 
 WORKDIR /srv

adminer-editor/entrypoint.sh

@@ -40,6 +40,15 @@ if [ -n "${ADMINER_THEME}" ]; then
     fi
 fi
 
+# Activate plugins (ADMINER_PLUGIN_<name>=1, all disabled by default)
+if [ "${ADMINER_PLUGIN_AUTOLOGIN}" = "1" ]; then
+    cp /srv/plugins-available/adminer-autologin.php /srv/adminer-plugins/
+    echo "[adminer] Plugin 'autologin' activated."
+elif [ "${ADMINER_PLUGIN_SERVER_LIST}" = "1" ]; then
+    cp /srv/plugins-available/adminer-server-list.php /srv/adminer-plugins/
+    echo "[adminer] Plugin 'server-list' activated."
+fi
+
 # Set default values if not provided
 MEMORY=${MEMORY:-256M}
 UPLOAD=${UPLOAD:-2048M}

adminer-full/Dockerfile

@@ -38,7 +38,8 @@ RUN echo '@community http://nl.alpinelinux.org/alpine/v3.22/community' >> /etc/a
     apk del wget unzip ca-certificates && \
     rm -rf /var/cache/apk/*
 
-ADD ./entrypoint.sh /entrypoint.sh
+ADD ./adminer-full/entrypoint.sh /entrypoint.sh
+ADD ./.plugins/ /srv/plugins-available/
 RUN chmod +x /entrypoint.sh
 
 WORKDIR /srv

adminer-full/entrypoint.sh

@@ -27,6 +27,15 @@ else
     echo "[adminer] No driver plugins directory found at /srv/plugins/drivers, skipping..."
 fi
 
+# Activate plugins (ADMINER_PLUGIN_<name>=1, all disabled by default)
+if [ "${ADMINER_PLUGIN_AUTOLOGIN}" = "1" ]; then
+    cp /srv/plugins-available/adminer-autologin.php /srv/adminer-plugins/
+    echo "[adminer] Plugin 'autologin' activated."
+elif [ "${ADMINER_PLUGIN_SERVER_LIST}" = "1" ]; then
+    cp /srv/plugins-available/adminer-server-list.php /srv/adminer-plugins/
+    echo "[adminer] Plugin 'server-list' activated."
+fi
+
 # Copy theme CSS files based on ADMINER_THEME environment variable
 if [ -n "${ADMINER_THEME}" ]; then
     THEME_DIR="/srv/designs/${ADMINER_THEME}"

adminer-mongo/Dockerfile

@@ -27,11 +27,13 @@ RUN echo '@community http://nl.alpinelinux.org/alpine/v3.22/community' >> /etc/a
     mkdir -p /srv/designs && \
     mv /tmp/adminer-$ADMINER_VERSION/designs/* /srv/designs/ 2>/dev/null || true && \
     rm -rf /tmp/* && \
+    mkdir -p /srv/adminer-plugins && \
     ln -s /usr/bin/php84 /usr/bin/php && \
     apk del wget unzip ca-certificates && \
     rm -rf /var/cache/apk/*
 
-ADD ./entrypoint.sh /entrypoint.sh
+ADD ./adminer-mongo/entrypoint.sh /entrypoint.sh
+ADD ./.plugins/ /srv/plugins-available/
 RUN chmod +x /entrypoint.sh
 
 WORKDIR /srv