fix: [Postgre] Semicolon in the connection parameters break the DSN string (#7552)

move all related code to the convertDSN() method

system/Database/Postgre/Connection.php

@@ -64,14 +64,11 @@ class Connection extends BaseConnection
             $this->buildDSN();
         }
 
-        // Strip pgsql if exists
+        // Convert DSN string
         if (mb_strpos($this->DSN, 'pgsql:') === 0) {
-            $this->DSN = mb_substr($this->DSN, 6);
+            $this->convertDSN();
         }
 
-        // Convert semicolons to spaces.
-        $this->DSN = str_replace(';', ' ', $this->DSN);
-
         $this->connID = $persistent === true ? pg_pconnect($this->DSN) : pg_connect($this->DSN);
 
         if ($this->connID !== false) {
@@ -92,6 +89,44 @@ class Connection extends BaseConnection
         return $this->connID;
     }
 
+    /**
+     * Converts the DSN with semicolon syntax.
+     */
+    private function convertDSN()
+    {
+        // Strip pgsql
+        $this->DSN = mb_substr($this->DSN, 6);
+
+        // Convert semicolons to spaces in DSN format like:
+        // pgsql:host=localhost;port=5432;dbname=database_name
+        // https://www.php.net/manual/en/function.pg-connect.php
+        $allowedParams = ['host', 'port', 'dbname', 'user', 'password', 'connect_timeout', 'options', 'sslmode', 'service'];
+
+        $parameters = explode(';', $this->DSN);
+
+        $output            = '';
+        $previousParameter = '';
+
+        foreach ($parameters as $parameter) {
+            [$key, $value] = explode('=', $parameter, 2);
+            if (in_array($key, $allowedParams, true)) {
+                if ($previousParameter !== '') {
+                    if (array_search($key, $allowedParams, true) < array_search($previousParameter, $allowedParams, true)) {
+                        $output .= ';';
+                    } else {
+                        $output .= ' ';
+                    }
+                }
+                $output .= $parameter;
+                $previousParameter = $key;
+            } else {
+                $output .= ';' . $parameter;
+            }
+        }
+
+        $this->DSN = $output;
+    }
+
     /**
      * Keep or establish the connection if no queries have been sent for
      * a length of time exceeding the server's idle timeout.

tests/system/Database/ConfigTest.php

@@ -13,6 +13,7 @@ namespace CodeIgniter\Database;
 
 use CodeIgniter\Test\CIUnitTestCase;
 use CodeIgniter\Test\ReflectionHelper;
+use Generator;
 
 /**
  * @internal
@@ -190,4 +191,47 @@ final class ConfigTest extends CIUnitTestCase
         $this->assertTrue($this->getPrivateProperty($conn, 'strictOn'));
         $this->assertSame([], $this->getPrivateProperty($conn, 'failover'));
     }
+
+    /**
+     * @dataProvider convertDSNProvider
+     *
+     * @see https://github.com/codeigniter4/CodeIgniter4/issues/7550
+     */
+    public function testConvertDSN(string $input, string $expected)
+    {
+        $this->dsnGroupPostgreNative['DSN'] = $input;
+        $conn                               = Config::connect($this->dsnGroupPostgreNative, false);
+        $this->assertInstanceOf(BaseConnection::class, $conn);
+
+        $method = $this->getPrivateMethodInvoker($conn, 'convertDSN');
+        $method();
+
+        $this->assertSame($expected, $this->getPrivateProperty($conn, 'DSN'));
+    }
+
+    public function convertDSNProvider(): Generator
+    {
+        yield from [
+            [
+                'pgsql:host=localhost;port=5432;dbname=database_name;user=username;password=password',
+                'host=localhost port=5432 dbname=database_name user=username password=password',
+            ],
+            [
+                'pgsql:host=localhost;port=5432;dbname=database_name;user=username;password=we;port=we',
+                'host=localhost port=5432 dbname=database_name user=username password=we;port=we',
+            ],
+            [
+                'pgsql:host=localhost;port=5432;dbname=database_name',
+                'host=localhost port=5432 dbname=database_name',
+            ],
+            [
+                "pgsql:host=localhost;port=5432;dbname=database_name;options='--client_encoding=UTF8'",
+                "host=localhost port=5432 dbname=database_name options='--client_encoding=UTF8'",
+            ],
+            [
+                'pgsql:host=localhost;port=5432;dbname=database_name;something=stupid',
+                'host=localhost port=5432 dbname=database_name;something=stupid',
+            ],
+        ];
+    }
 }

user_guide_src/source/changelogs/v4.3.6.rst

@@ -50,6 +50,7 @@ Bugs Fixed
   the value of a placeholder.
 - **Validation:** Fixed a bug that ``check()`` cannot specify non-default
   database group.
+- **Database:** Fixed a bug where semicolon character (``;``) in one of the Postgre connection parameters would break the DSN string.
 
 See the repo's
 `CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_