From 60ad16117868103cb053881ecf14303236b6bcbc Mon Sep 17 00:00:00 2001
From: Jakub Vrana <jakub@vrana.cz>
Date: Fri, 14 May 2021 06:21:09 +0200
Subject: [PATCH] PostgreSQL: Fix parsing of foreign keys with non-ASCII column
 names (thanks to Tomas Pecina)

---
 adminer/drivers/pgsql.inc.php     | 10 +++++-----
 adminer/drivers/sqlite.inc.php    |  4 ++--
 adminer/include/functions.inc.php |  3 +++
 changes.txt                       |  1 +
 4 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/adminer/drivers/pgsql.inc.php b/adminer/drivers/pgsql.inc.php
index 296b8aa3..caeda875 100644
--- a/adminer/drivers/pgsql.inc.php
+++ b/adminer/drivers/pgsql.inc.php
@@ -378,7 +378,7 @@ ORDER BY a.attnum"
 			$row["auto_increment"] = $row['attidentity'] || preg_match('~^nextval\(~i', $row["default"]);
 			$row["privileges"] = array("insert" => 1, "select" => 1, "update" => 1);
 			if (preg_match('~(.+)::[^,)]+(.*)~', $row["default"], $match)) {
-				$row["default"] = ($match[1] == "NULL" ? null : (($match[1][0] == "'" ? idf_unescape($match[1]) : $match[1]) . $match[2]));
+				$row["default"] = ($match[1] == "NULL" ? null : idf_unescape($match[1]) . $match[2]);
 			}
 			$return[$row["field"]] = $row;
 		}
@@ -418,12 +418,12 @@ WHERE conrelid = (SELECT pc.oid FROM pg_class AS pc INNER JOIN pg_namespace AS p
 AND contype = 'f'::char
 ORDER BY conkey, conname") as $row) {
 			if (preg_match('~FOREIGN KEY\s*\((.+)\)\s*REFERENCES (.+)\((.+)\)(.*)$~iA', $row['definition'], $match)) {
-				$row['source'] = array_map('trim', explode(',', $match[1]));
+				$row['source'] = array_map('idf_unescape', array_map('trim', explode(',', $match[1])));
 				if (preg_match('~^(("([^"]|"")+"|[^"]+)\.)?"?("([^"]|"")+"|[^"]+)$~', $match[2], $match2)) {
-					$row['ns'] = str_replace('""', '"', preg_replace('~^"(.+)"$~', '\1', $match2[2]));
-					$row['table'] = str_replace('""', '"', preg_replace('~^"(.+)"$~', '\1', $match2[4]));
+					$row['ns'] = idf_unescape($match2[2]);
+					$row['table'] = idf_unescape($match2[4]);
 				}
-				$row['target'] = array_map('trim', explode(',', $match[3]));
+				$row['target'] = array_map('idf_unescape', array_map('trim', explode(',', $match[3])));
 				$row['on_delete'] = (preg_match("~ON DELETE ($on_actions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
 				$row['on_update'] = (preg_match("~ON UPDATE ($on_actions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
 				$return[$row['conname']] = $row;
diff --git a/adminer/drivers/sqlite.inc.php b/adminer/drivers/sqlite.inc.php
index da698fdd..e85fd31c 100644
--- a/adminer/drivers/sqlite.inc.php
+++ b/adminer/drivers/sqlite.inc.php
@@ -140,7 +140,7 @@ if (isset($_GET["sqlite"]) || isset($_GET["sqlite2"])) {
 					}
 					$return = array();
 					foreach ($row as $key => $val) {
-						$return[($key[0] == '"' ? idf_unescape($key) : $key)] = $val;
+						$return[idf_unescape($key)] = $val;
 					}
 					return $return;
 				}
@@ -676,7 +676,7 @@ if (isset($_GET["sqlite"]) || isset($_GET["sqlite2"])) {
 		return array(
 			"Timing" => strtoupper($match[1]),
 			"Event" => strtoupper($match[2]) . ($of ? " OF" : ""),
-			"Of" => ($of[0] == '`' || $of[0] == '"' ? idf_unescape($of) : $of),
+			"Of" => idf_unescape($of),
 			"Trigger" => $name,
 			"Statement" => $match[4],
 		);
diff --git a/adminer/include/functions.inc.php b/adminer/include/functions.inc.php
index 476cf5cc..b33d8295 100644
--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -29,6 +29,9 @@ function version() {
 * @return string
 */
 function idf_unescape($idf) {
+	if (!preg_match('~^[`\'"]~', $idf)) {
+		return $idf;
+	}
 	$last = substr($idf, -1);
 	return str_replace($last . $last, $last, substr($idf, 1, -1));
 }
diff --git a/changes.txt b/changes.txt
index 6c4301eb..9622f194 100644
--- a/changes.txt
+++ b/changes.txt
@@ -5,6 +5,7 @@ MySQL: Allow moving views to other DB and renaming DB with views (bug #783)
 MariaDB: Do not treat sequences as views (PR #416)
 PostgreSQL: Support UPDATE OF triggers (bug #789)
 PostgreSQL: Support triggers with more events (OR)
+PostgreSQL: Fix parsing of foreign keys with non-ASCII column names
 PostgreSQL < 10 PDO: Avoid displaying GENERATED ALWAYS BY IDENTITY everywhere (bug #785, regression from 4.7.9)
 SQLite: Fix displayed types (bug #784, regression from 4.8.0)