From ce283c12b6ba8d27dc0d2934ffe7d6f7b6743a02 Mon Sep 17 00:00:00 2001
From: Arthur Schiwon <blizzz@arthur-schiwon.de>
Date: Tue, 31 Aug 2021 21:01:27 +0200
Subject: make it possible to  override the default collation

- allows admins to configure it for edge cases like accent sensitivity

Signed-off-by: Arthur Schiwon <blizzz@arthur-schiwon.de>
---
 lib/private/DB/AdapterMySQL.php                              | 12 ++++++------
 lib/private/DB/ConnectionFactory.php                         |  4 ++++
 .../ExpressionBuilder/MySqlExpressionBuilder.php             |  6 +++---
 3 files changed, 13 insertions(+), 9 deletions(-)

(limited to 'lib')

diff --git a/lib/private/DB/AdapterMySQL.php b/lib/private/DB/AdapterMySQL.php
index 43da88b4b74..b4be5c2e96a 100644
--- a/lib/private/DB/AdapterMySQL.php
+++ b/lib/private/DB/AdapterMySQL.php
@@ -25,7 +25,7 @@ namespace OC\DB;
 class AdapterMySQL extends Adapter {
 
 	/** @var string */
-	protected $charset;
+	protected $collation;
 
 	/**
 	 * @param string $tableName
@@ -39,16 +39,16 @@ class AdapterMySQL extends Adapter {
 	}
 
 	public function fixupStatement($statement) {
-		$statement = str_replace(' ILIKE ', ' COLLATE ' . $this->getCharset() . '_general_ci LIKE ', $statement);
+		$statement = str_replace(' ILIKE ', ' COLLATE ' . $this->getCollation() . ' LIKE ', $statement);
 		return $statement;
 	}
 
-	protected function getCharset() {
-		if (!$this->charset) {
+	protected function getCollation(): string {
+		if (!$this->collation) {
 			$params = $this->conn->getParams();
-			$this->charset = isset($params['charset']) ? $params['charset'] : 'utf8';
+			$this->collation = $params['collation'] ?? (($params['charset'] ?? 'utf8') . '_general_ci');
 		}
 
-		return $this->charset;
+		return $this->collation;
 	}
 }
diff --git a/lib/private/DB/ConnectionFactory.php b/lib/private/DB/ConnectionFactory.php
index 53e488b5f09..b4c7597f6d4 100644
--- a/lib/private/DB/ConnectionFactory.php
+++ b/lib/private/DB/ConnectionFactory.php
@@ -89,6 +89,10 @@ class ConnectionFactory {
 		if ($this->config->getValue('mysql.utf8mb4', false)) {
 			$this->defaultConnectionParams['mysql']['charset'] = 'utf8mb4';
 		}
+		$collationOverride = $this->config->getValue('mysql.collation', null);
+		if ($collationOverride) {
+			$this->defaultConnectionParams['mysql']['collation'] = $collationOverride;
+		}
 	}
 
 	/**
diff --git a/lib/private/DB/QueryBuilder/ExpressionBuilder/MySqlExpressionBuilder.php b/lib/private/DB/QueryBuilder/ExpressionBuilder/MySqlExpressionBuilder.php
index 3a0f45bcde7..e917ad3ad3a 100644
--- a/lib/private/DB/QueryBuilder/ExpressionBuilder/MySqlExpressionBuilder.php
+++ b/lib/private/DB/QueryBuilder/ExpressionBuilder/MySqlExpressionBuilder.php
@@ -31,7 +31,7 @@ use OCP\DB\QueryBuilder\IQueryBuilder;
 class MySqlExpressionBuilder extends ExpressionBuilder {
 
 	/** @var string */
-	protected $charset;
+	protected $collation;
 
 	/**
 	 * @param ConnectionAdapter $connection
@@ -41,7 +41,7 @@ class MySqlExpressionBuilder extends ExpressionBuilder {
 		parent::__construct($connection, $queryBuilder);
 
 		$params = $connection->getInner()->getParams();
-		$this->charset = isset($params['charset']) ? $params['charset'] : 'utf8';
+		$this->collation = $params['collation'] ?? (($params['charset'] ?? 'utf8') . '_general_ci');
 	}
 
 	/**
@@ -50,6 +50,6 @@ class MySqlExpressionBuilder extends ExpressionBuilder {
 	public function iLike($x, $y, $type = null): string {
 		$x = $this->helper->quoteColumnName($x);
 		$y = $this->helper->quoteColumnName($y);
-		return $this->expressionBuilder->comparison($x, ' COLLATE ' . $this->charset . '_general_ci LIKE', $y);
+		return $this->expressionBuilder->comparison($x, ' COLLATE ' . $this->collation . ' LIKE', $y);
 	}
 }
-- 
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