move to psr-4 autoloader

classes/Mailer.php

@@ -0,0 +1,65 @@
+<?php
+class Mailer {
+	private string $last_error = "";
+
+	/**
+	 * @param array<string, mixed> $params
+	 * @return bool|int bool if the default mail function handled the request, otherwise an int as described in Mailer#mail()
+	 */
+	function mail(array $params) {
+
+		$to_name = $params["to_name"] ?? "";
+		$to_address = $params["to_address"];
+		$subject = $params["subject"];
+		$message = $params["message"];
+		$message_html = $params["message_html"] ?? "";
+		$from_name = $params["from_name"] ?? Config::get(Config::SMTP_FROM_NAME);
+		$from_address = $params["from_address"] ?? Config::get(Config::SMTP_FROM_ADDRESS);
+		$additional_headers = $params["headers"] ?? [];
+
+		$from_combined = $from_name ? "$from_name <$from_address>" : $from_address;
+		$to_combined = $to_name ? "$to_name <$to_address>" : $to_address;
+
+		if (Config::get(Config::LOG_SENT_MAIL))
+			Logger::log(E_USER_NOTICE, "Sending mail from $from_combined to $to_combined [$subject]: $message");
+
+		// HOOK_SEND_MAIL plugin instructions:
+		// 1. return 1 or true if mail is handled
+		// 2. return -1 if there's been a fatal error and no further action is allowed
+		// 3. any other return value will allow cycling to the next handler and, eventually, to default mail() function
+		// 4. set error message if needed via passed Mailer instance function set_error()
+
+		$hooks_tried = 0;
+
+		foreach (PluginHost::getInstance()->get_hooks(PluginHost::HOOK_SEND_MAIL) as $p) {
+			$rc = $p->hook_send_mail($this, $params);
+
+			if ($rc == 1)
+				return $rc;
+
+			if ($rc == -1)
+				return 0;
+
+			++$hooks_tried;
+		}
+
+		$headers = [ "From: $from_combined", "Content-Type: text/plain; charset=UTF-8" ];
+
+		$rc = mail($to_combined, $subject, $message, implode("\r\n", [...$headers, ...$additional_headers]));
+
+		if (!$rc) {
+			$this->set_error(error_get_last()['message'] ?? T_sprintf("Unknown error while sending mail. Hooks tried: %d.", $hooks_tried));
+		}
+
+		return $rc;
+	}
+
+	function set_error(string $message): void {
+		$this->last_error = $message;
+		user_error("Error sending mail: $message", E_USER_WARNING);
+	}
+
+	function error(): string {
+		return $this->last_error;
+	}
+}