Start of implementation of Import and Export using LDIF

app/Classes/LDAP/Export/LDIF.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace App\Classes\LDAP\Export;
+
+use Illuminate\Support\Str;
+
+use App\Classes\LDAP\Export;
+
+/**
+ * Export from LDAP using an LDIF format
+ */
+class LDIF extends Export
+{
+	// The maximum length of the ldif line
+	private int $line_length = 76;
+	protected const type = 'LDIF Export';
+
+	public function __toString(): string
+	{
+		$result = parent::header();
+		$result .= 'version: 1';
+		$result .= $this->br;
+
+		$c = 1;
+		foreach ($this->items as $o) {
+			if ($c > 1)
+				$result .= $this->br;
+
+			$title = (string)$o;
+			if (strlen($title) > $this->line_length)
+				$title = Str::of($title)->limit($this->line_length-3-5,'...'.substr($title,-5));
+
+			$result .= sprintf('# %s %s: %s',__('Entry'),$c++,$title).$this->br;
+
+			// Display DN
+			$result .= $this->multiLineDisplay(
+				Str::isAscii($o)
+					? sprintf('dn: %s',$o)
+					: sprintf('dn:: %s',base64_encode($o))
+				,$this->br);
+
+			// Display Attributes
+			foreach ($o->getObjects() as $ao) {
+				foreach ($ao->values as $value) {
+					$result .= $this->multiLineDisplay(
+						Str::isAscii($value)
+							? sprintf('%s: %s',$ao->name,$value)
+							: sprintf('%s:: %s',$ao->name,base64_encode($value))
+					,$this->br);
+				}
+			}
+		}
+
+		return $result;
+	}
+
+	/**
+	 * Helper method to wrap LDIF lines
+	 *
+	 * @param string $str The line to be wrapped if needed.
+	 */
+	private function multiLineDisplay(string $str,string $br): string
+	{
+		$length_string = strlen($str);
+		$length_max = $this->line_length;
+
+		$output = '';
+		while ($length_string > $length_max) {
+			$output .= substr($str,0,$length_max).$br;
+			$str = ' '.substr($str,$length_max);
+			$length_string = strlen($str);
+		}
+
+		$output .= $str.$br;
+
+		return $output;
+	}
+}