Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 221 insertions, 0 deletions

diff --git a/wp-admin/install-helper.php b/wp-admin/install-helper.php
new file mode 100644
index 0000000..d9aaaba
--- /dev/null
+++ b/wp-admin/install-helper.php
@@ -0,0 +1,221 @@
+<?php
+/**
+ * Plugins may load this file to gain access to special helper functions
+ * for plugin installation. This file is not included by WordPress and it is
+ * recommended, to prevent fatal errors, that this file is included using
+ * require_once.
+ *
+ * These functions are not optimized for speed, but they should only be used
+ * once in a while, so speed shouldn't be a concern. If it is and you are
+ * needing to use these functions a lot, you might experience timeouts.
+ * If you do, then it is advised to just write the SQL code yourself.
+ *
+ *     check_column( 'wp_links', 'link_description', 'mediumtext' );
+ *
+ *     if ( check_column( $wpdb->comments, 'comment_author', 'tinytext' ) ) {
+ *         echo "ok\n";
+ *     }
+ *
+ *     // Check the column.
+ *     if ( ! check_column( $wpdb->links, 'link_description', 'varchar( 255 )' ) ) {
+ *         $ddl = "ALTER TABLE $wpdb->links MODIFY COLUMN link_description varchar(255) NOT NULL DEFAULT '' ";
+ *         $q = $wpdb->query( $ddl );
+ *     }
+ *
+ *     $error_count = 0;
+ *     $tablename   = $wpdb->links;
+ *
+ *     if ( check_column( $wpdb->links, 'link_description', 'varchar( 255 )' ) ) {
+ *         $res .= $tablename . ' - ok <br />';
+ *     } else {
+ *         $res .= 'There was a problem with ' . $tablename . '<br />';
+ *         ++$error_count;
+ *     }
+ *
+ * @package WordPress
+ * @subpackage Plugin
+ */
+
+/** Load WordPress Bootstrap */
+require_once dirname( __DIR__ ) . '/wp-load.php';
+
+if ( ! function_exists( 'maybe_create_table' ) ) :
+	/**
+	 * Creates a table in the database if it doesn't already exist.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 *
+	 * @param string $table_name Database table name.
+	 * @param string $create_ddl SQL statement to create table.
+	 * @return bool True on success or if the table already exists. False on failure.
+	 */
+	function maybe_create_table( $table_name, $create_ddl ) {
+		global $wpdb;
+
+		foreach ( $wpdb->get_col( 'SHOW TABLES', 0 ) as $table ) {
+			if ( $table === $table_name ) {
+				return true;
+			}
+		}
+
+		// Didn't find it, so try to create it.
+		// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- No applicable variables for this query.
+		$wpdb->query( $create_ddl );
+
+		// We cannot directly tell whether this succeeded!
+		foreach ( $wpdb->get_col( 'SHOW TABLES', 0 ) as $table ) {
+			if ( $table === $table_name ) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+endif;
+
+if ( ! function_exists( 'maybe_add_column' ) ) :
+	/**
+	 * Adds column to database table, if it doesn't already exist.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 *
+	 * @param string $table_name  Database table name.
+	 * @param string $column_name Table column name.
+	 * @param string $create_ddl  SQL statement to add column.
+	 * @return bool True on success or if the column already exists. False on failure.
+	 */
+	function maybe_add_column( $table_name, $column_name, $create_ddl ) {
+		global $wpdb;
+
+		// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
+		foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
+			if ( $column === $column_name ) {
+				return true;
+			}
+		}
+
+		// Didn't find it, so try to create it.
+		// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- No applicable variables for this query.
+		$wpdb->query( $create_ddl );
+
+		// We cannot directly tell whether this succeeded!
+		// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
+		foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
+			if ( $column === $column_name ) {
+				return true;
+			}
+		}
+
+		return false;
+	}
+endif;
+
+/**
+ * Drops column from database table, if it exists.
+ *
+ * @since 1.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $table_name  Database table name.
+ * @param string $column_name Table column name.
+ * @param string $drop_ddl    SQL statement to drop column.
+ * @return bool True on success or if the column doesn't exist. False on failure.
+ */
+function maybe_drop_column( $table_name, $column_name, $drop_ddl ) {
+	global $wpdb;
+
+	// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
+	foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
+		if ( $column === $column_name ) {
+
+			// Found it, so try to drop it.
+			// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- No applicable variables for this query.
+			$wpdb->query( $drop_ddl );
+
+			// We cannot directly tell whether this succeeded!
+			// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
+			foreach ( $wpdb->get_col( "DESC $table_name", 0 ) as $column ) {
+				if ( $column === $column_name ) {
+					return false;
+				}
+			}
+		}
+	}
+
+	// Else didn't find it.
+	return true;
+}
+
+/**
+ * Checks that database table column matches the criteria.
+ *
+ * Uses the SQL DESC for retrieving the table info for the column. It will help
+ * understand the parameters, if you do more research on what column information
+ * is returned by the SQL statement. Pass in null to skip checking that criteria.
+ *
+ * Column names returned from DESC table are case sensitive and are as listed:
+ *
+ *  - Field
+ *  - Type
+ *  - Null
+ *  - Key
+ *  - Default
+ *  - Extra
+ *
+ * @since 1.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $table_name    Database table name.
+ * @param string $col_name      Table column name.
+ * @param string $col_type      Table column type.
+ * @param bool   $is_null       Optional. Check is null.
+ * @param mixed  $key           Optional. Key info.
+ * @param mixed  $default_value Optional. Default value.
+ * @param mixed  $extra         Optional. Extra value.
+ * @return bool True, if matches. False, if not matching.
+ */
+function check_column( $table_name, $col_name, $col_type, $is_null = null, $key = null, $default_value = null, $extra = null ) {
+	global $wpdb;
+
+	$diffs = 0;
+
+	// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared -- Cannot be prepared. Fetches columns for table names.
+	$results = $wpdb->get_results( "DESC $table_name" );
+
+	foreach ( $results as $row ) {
+
+		if ( $row->Field === $col_name ) {
+
+			// Got our column, check the params.
+			if ( ( null !== $col_type ) && ( $row->Type !== $col_type ) ) {
+				++$diffs;
+			}
+			if ( ( null !== $is_null ) && ( $row->Null !== $is_null ) ) {
+				++$diffs;
+			}
+			if ( ( null !== $key ) && ( $row->Key !== $key ) ) {
+				++$diffs;
+			}
+			if ( ( null !== $default_value ) && ( $row->Default !== $default_value ) ) {
+				++$diffs;
+			}
+			if ( ( null !== $extra ) && ( $row->Extra !== $extra ) ) {
+				++$diffs;
+			}
+
+			if ( $diffs > 0 ) {
+				return false;
+			}
+
+			return true;
+		} // End if found our column.
+	}
+
+	return false;
+}