initial commit

.gitignore

+pg-data/*
+.env

README.md

+# Docker-Container für Einführung in Datenbanken
+
+Der Container installiert ein Postgres-DBMS in der Version 11.2 mit mehreren Übungsdatenbanken und die Adminer-Web-Applikation, um mit SQL auf diese Datenbanken zugreifen zu können.
+
+## Installation
+Zum Arbeiten mit Docker brauchen sie  Administrator-Rechte oder sie müssen in der Gruppe `docker` sein.
+1. Installieren sie [Docker Community Edition](https://docs.docker.com/install/) und [Docker-Compose](https://docs.docker.com/compose/install/).
+2. Laden sie sich dieses Projekt auf ihren Computer, entpacken sie es und wechseln sie in das Verzeichnis `edb-pg-adm`.
+3. Kopieren sie die Datei `env-example` nach `.env` und editieren sie `.env` um die Passwörter für den Datenbankzugriff zu setzen und den Port für die Adminer-Web-Applikation festzulegen.
+4. Führen sie in dem Verzeichnis `edb-pg-adm` in einer Shell das folgende Kommando aus, um den Container zu starten
+```
+docker-compose up
+```
+Beim ersten Start werden die Container für Postgres und Adminer von [hub.docker.com](https://hub.docker.com) geladen und die Datenbanken in dem Unterverzeichnis `pg-data` angelegt.
+
+## Arbeiten mit dem Docker-Container
+
+Wenn der Docker-Container gestartet wurde (wie in Schritt 4 beschrieben) können mit einem Browser auf Adminer zu greifen. Wenn sie den Container auf ihren Computer installiert und den Port 80 gesetzt haben, ist der Link [http://localhost:80](http://localhost:80).
+
+Sie können sich als der Nutzer `student_gast` mit dem Passwort einloggen, dass sie in der Datei `.env` vorgegeben haben.
+In der Datenbank `postgres` sind folgende Datenbankschemata installiert:
+- `student_public` mit den Tabellen aus der Vorlesung
+- `empdept_public`
+- `komponist`
+- `maerchen`
+- `presidents`
+- `sakila`
+- `auto_motorcycle`    

docker-compose.yml

+version: '3.4'
+
+services:
+  db:
+    image: postgres:alpine
+    container_name: postgres
+    restart: always
+    environment:
+     - POSTGRES_PASSWORD
+     - STUDENT_PASSWORD
+    volumes:
+     - "./pg-data:/var/lib/postgresql/data"
+     - "./init:/docker-entrypoint-initdb.d"
+
+  adminer:
+    build:
+      context: ./src
+      dockerfile: Dockerfile
+    restart: always
+    environment:
+     - ADMINER_PLUGINS=account-nolock-plugin
+    ports:
+      - ${ADMINER_PORT}:8080

env-example

+# Change the settings to your need and rename this file to .env .
+
+# Be careful, setting those passwords takes effect only when 
+# databases are created.
+# The postgres-docker-container creates databases only if 
+# the pg_data directory is empty or not existing.
+
+POSTGRES_PASSWORD=change-this!
+STUDENT_PASSWORD=change-this-too!
+
+# Access adminer over the specified port, e.g. http://localhost:80/
+ADMINER_PORT=80

init/00-0_init_postgres.sh

+#!/bin/bash
+set -e
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+  CREATE ROLE student
+    WITH
+    NOLOGIN
+  ;
+
+  CREATE ROLE student_gast
+    WITH
+    LOGIN
+    PASSWORD '${STUDENT_PASSWORD}'
+    IN ROLE student
+  ;
+  REVOKE ALL PRIVILEGES ON DATABASE postgres FROM student, student_gast;
+  GRANT CONNECT ON DATABASE postgres TO student;
+
+  REVOKE ALL ON SCHEMA public FROM public;
+  REVOKE ALL ON ALL TABLES IN SCHEMA public FROM public, student, student_gast;
+  DROP SCHEMA public;
+EOSQL

init/00-1_init_template1.sh

+#!/bin/bash
+set -e
+
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "template1" <<-EOSQL
+   REVOKE ALL PRIVILEGES ON DATABASE template1 FROM student, student_gast;
+   REVOKE ALL ON SCHEMA public FROM public;
+   REVOKE ALL ON ALL TABLES IN SCHEMA public FROM public, student, student_gast;
+EOSQL

src/Dockerfile

+from adminer:4.7.1
+USER root:root
+COPY account-nolock-plugin.php /var/www/html/plugins/
+COPY plugin.php /var/www/html/plugins/
+USER adminer:adminer

src/account-nolock-plugin.php

+<?php
+/** Disable account locking
+*/
+class AdminerNolock  {
+
+        function bruteForceKey() {
+          // Return high resolution time
+          // to get for each call a different key.
+          // This effectively disables the locking mechanism
+          // that forces a wait time of 30 min after 30 failed
+          // login attempts. This could is needed in class room situations
+          // with all clients accessing adminer through the same IP
+          // to prevent locking adminer by single students.
+
+          // convert time to string by prefixing "t"
+          // as the caller expects a string.
+          return "t" . hrtime(true);
+        }
+}

src/plugin.php

+<?php
+
+/** Adminer customization allowing usage of plugins
+* @link https://www.adminer.org/plugins/#use
+* @author Jakub Vrana, https://www.vrana.cz/
+* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
+* @license https://www.gnu.org/licenses/gpl-2.0.html GNU General Public License, version 2 (one or other)
+*/
+class AdminerPlugin extends Adminer {
+	/** @access protected */
+	var $plugins;
+
+	function _findRootClass($class) { // is_subclass_of(string, string) is available since PHP 5.0.3
+		do {
+			$return = $class;
+		} while ($class = get_parent_class($class));
+		return $return;
+	}
+
+	/** Register plugins
+	* @param array object instances or null to register all classes starting by 'Adminer'
+	*/
+	function __construct($plugins) {
+		if ($plugins === null) {
+			$plugins = array();
+			foreach (get_declared_classes() as $class) {
+				if (preg_match('~^Adminer.~i', $class) && strcasecmp($this->_findRootClass($class), 'Adminer')) { //! can use interface
+					$plugins[$class] = new $class;
+				}
+			}
+		}
+		$this->plugins = $plugins;
+		//! it is possible to use ReflectionObject to find out which plugins defines which methods at once
+	}
+
+	function _callParent($function, $args) {
+		return call_user_func_array(array('parent', $function), $args);
+	}
+
+	function _applyPlugin($function, $args) {
+		foreach ($this->plugins as $plugin) {
+			if (method_exists($plugin, $function)) {
+				switch (count($args)) { // call_user_func_array() doesn't work well with references
+					case 0: $return = $plugin->$function(); break;
+					case 1: $return = $plugin->$function($args[0]); break;
+					case 2: $return = $plugin->$function($args[0], $args[1]); break;
+					case 3: $return = $plugin->$function($args[0], $args[1], $args[2]); break;
+					case 4: $return = $plugin->$function($args[0], $args[1], $args[2], $args[3]); break;
+					case 5: $return = $plugin->$function($args[0], $args[1], $args[2], $args[3], $args[4]); break;
+					case 6: $return = $plugin->$function($args[0], $args[1], $args[2], $args[3], $args[4], $args[5]); break;
+					default: trigger_error('Too many parameters.', E_USER_WARNING);
+				}
+				if ($return !== null) {
+					return $return;
+				}
+			}
+		}
+		return $this->_callParent($function, $args);
+	}
+
+	function _appendPlugin($function, $args) {
+		$return = $this->_callParent($function, $args);
+		foreach ($this->plugins as $plugin) {
+			if (method_exists($plugin, $function)) {
+				$value = call_user_func_array(array($plugin, $function), $args);
+				if ($value) {
+					$return += $value;
+				}
+			}
+		}
+		return $return;
+	}
+
+	// appendPlugin
+
+	function dumpFormat() {
+		$args = func_get_args();
+		return $this->_appendPlugin(__FUNCTION__, $args);
+	}
+
+	function dumpOutput() {
+		$args = func_get_args();
+		return $this->_appendPlugin(__FUNCTION__, $args);
+	}
+
+	function editFunctions($field) {
+		$args = func_get_args();
+		return $this->_appendPlugin(__FUNCTION__, $args);
+	}
+
+	// applyPlugin
+
+function bruteForceKey() {
+	$args = func_get_args();
+	return $this->_applyPlugin(__FUNCTION__, $args);
+}
+
+	function name() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function credentials() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function connectSsl() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function permanentLogin($create = false) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function serverName($server) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function database() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function schemas() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function databases($flush = true) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function queryTimeout() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function headers() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function csp() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function head() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function css() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function loginForm() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function loginFormField($name, $heading, $value) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function login($login, $password) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function tableName($tableStatus) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function fieldName($field, $order = 0) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectLinks($tableStatus, $set = "") {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function foreignKeys($table) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function backwardKeys($table, $tableName) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function backwardKeysPrint($backwardKeys, $row) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectQuery($query, $start, $failed = false) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function sqlCommandQuery($query) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function rowDescription($table) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function rowDescriptions($rows, $foreignKeys) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectLink($val, $field) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectVal($val, $link, $field, $original) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function editVal($val, $field) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function tableStructurePrint($fields) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function tableIndexesPrint($indexes) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectColumnsPrint($select, $columns) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectSearchPrint($where, $columns, $indexes) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectOrderPrint($order, $columns, $indexes) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectLimitPrint($limit) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectLengthPrint($text_length) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectActionPrint($indexes) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectCommandPrint() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectImportPrint() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectEmailPrint($emailFields, $columns) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectColumnsProcess($columns, $indexes) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectSearchProcess($fields, $indexes) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectOrderProcess($fields, $indexes) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectLimitProcess() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectLengthProcess() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectEmailProcess($where, $foreignKeys) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function selectQueryBuild($select, $where, $group, $order, $limit, $page) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function messageQuery($query, $time, $failed = false) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function editInput($table, $field, $attrs, $value) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function editHint($table, $field, $value) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function processInput($field, $value, $function = "") {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function dumpDatabase($db) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function dumpTable($table, $style, $is_view = 0) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function dumpData($table, $style, $query) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function dumpFilename($identifier) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function dumpHeaders($identifier, $multi_table = false) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function importServerPath() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function homepage() {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function navigation($missing) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function databasesPrint($missing) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+	function tablesPrint($tables) {
+		$args = func_get_args();
+		return $this->_applyPlugin(__FUNCTION__, $args);
+	}
+
+}