first commit

wp-content/plugins/wpml-string-translation/classes/translations-file-scan/charset-validation/wpml-st-translations-file-scan-charset-validation.php

@@ -0,0 +1,8 @@
+<?php
+
+interface WPML_ST_Translations_File_Scan_Charset_Validation {
+	/**
+	 * @return bool
+	 */
+	public function is_valid();
+}

wp-content/plugins/wpml-string-translation/classes/translations-file-scan/charset-validation/wpml-st-translations-file-scan-db-charset-validation-factory.php

@@ -0,0 +1,18 @@
+<?php
+
+class WPML_ST_Translations_File_Scan_Db_Charset_Filter_Factory {
+
+	/** @var wpdb $wpdb */
+	private $wpdb;
+
+	public function __construct( wpdb $wpdb ) {
+		$this->wpdb = $wpdb;
+	}
+
+	public function create() {
+		$charset_validator = new WPML_ST_Translations_File_Scan_Db_Charset_Validation( $this->wpdb, new WPML_ST_Translations_File_Scan_Db_Table_List( $this->wpdb ) );
+
+		return $charset_validator->is_valid() ? null : new WPML_ST_Translations_File_Unicode_Characters_Filter();
+	}
+
+}

wp-content/plugins/wpml-string-translation/classes/translations-file-scan/charset-validation/wpml-st-translations-file-scan-db-charset-validation.php

@@ -0,0 +1,51 @@
+<?php
+
+class WPML_ST_Translations_File_Scan_Db_Charset_Validation implements WPML_ST_Translations_File_Scan_Charset_Validation {
+	/** @var wpdb */
+	private $wpdb;
+
+	/** @var WPML_ST_Translations_File_Scan_Db_Table_List */
+	private $table_list;
+
+	/**
+	 * @param wpdb                                         $wpdb
+	 * @param WPML_ST_Translations_File_Scan_Db_Table_List $table_list
+	 */
+	public function __construct( wpdb $wpdb, WPML_ST_Translations_File_Scan_Db_Table_List $table_list ) {
+		$this->wpdb       = $wpdb;
+		$this->table_list = $table_list;
+	}
+
+
+	/**
+	 * @return bool
+	 */
+	public function is_valid() {
+		if ( ! $this->wpdb->has_cap( 'utf8mb4' ) ) {
+			return false;
+		}
+
+		$chunks = array();
+		foreach ( $this->table_list->get_tables() as $table ) {
+			$chunks[] = $this->get_unique_collation_list_from_table( $table );
+		}
+
+		$collations = call_user_func_array( 'array_merge', $chunks );
+		$collations = array_unique( $collations );
+
+		return count( $collations ) < 2;
+	}
+
+
+
+	/**
+	 * @param string $table
+	 *
+	 * @return array
+	 */
+	private function get_unique_collation_list_from_table( $table ) {
+		$columns = $this->wpdb->get_results( "SHOW FULL COLUMNS FROM `{$table}` WHERE Collation LIKE 'utf8mb4%'" );
+
+		return array_unique( wp_list_pluck( $columns, 'Collation' ) );
+	}
+}

wp-content/plugins/wpml-string-translation/classes/translations-file-scan/charset-validation/wpml-st-translations-file-scan-db-table-list.php

@@ -0,0 +1,23 @@
+<?php
+
+class WPML_ST_Translations_File_Scan_Db_Table_List {
+	/** @var wpdb */
+	private $wpdb;
+
+	/**
+	 * @param wpdb $wpdb
+	 */
+	public function __construct( wpdb $wpdb ) {
+		$this->wpdb = $wpdb;
+	}
+
+	/**
+	 * @return array
+	 */
+	public function get_tables() {
+		return array(
+			$this->wpdb->prefix . 'icl_strings',
+			$this->wpdb->prefix . 'icl_string_translations',
+		);
+	}
+}