From cdd7ad020e165fe680703b6d3319b908b682fb7a Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <fox@fakecake.org>
Date: Fri, 20 Oct 2023 17:12:29 +0300
Subject: jaeger-client -> opentelemetry

---
 .../SanitizeCombinedHeadersPropagationGetter.php   | 46 ++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 vendor/open-telemetry/context/Propagation/SanitizeCombinedHeadersPropagationGetter.php

(limited to 'vendor/open-telemetry/context/Propagation/SanitizeCombinedHeadersPropagationGetter.php')

diff --git a/vendor/open-telemetry/context/Propagation/SanitizeCombinedHeadersPropagationGetter.php b/vendor/open-telemetry/context/Propagation/SanitizeCombinedHeadersPropagationGetter.php
new file mode 100644
index 000000000..40652982e
--- /dev/null
+++ b/vendor/open-telemetry/context/Propagation/SanitizeCombinedHeadersPropagationGetter.php
@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\Context\Propagation;
+
+use function preg_replace;
+
+/**
+ * Some servers concatenate multiple headers with ';' -- we need to replace these with ','
+ * This is still a workaround and doesn't get around the problem fully, specifically it doesn't
+ * handle edge cases where the header has a trailing ';' or an empty trace state.
+ * We also need to trim trailing separators from the header, found when a header is empty.
+ */
+final class SanitizeCombinedHeadersPropagationGetter implements PropagationGetterInterface
+{
+    private const LIST_MEMBERS_SEPARATOR = ',';
+    private const SERVER_CONCAT_HEADERS_REGEX = '/;(?=[^,=;]*=|$)/';
+    private const TRAILING_LEADING_SEPARATOR_REGEX = '/^' . self::LIST_MEMBERS_SEPARATOR . '+|' . self::LIST_MEMBERS_SEPARATOR . '+$/';
+
+    private PropagationGetterInterface $getter;
+
+    public function __construct(PropagationGetterInterface $getter)
+    {
+        $this->getter = $getter;
+    }
+
+    public function keys($carrier): array
+    {
+        return $this->getter->keys($carrier);
+    }
+
+    public function get($carrier, string $key): ?string
+    {
+        $value = $this->getter->get($carrier, $key);
+        if ($value === null) {
+            return null;
+        }
+
+        return preg_replace(
+            [self::SERVER_CONCAT_HEADERS_REGEX, self::TRAILING_LEADING_SEPARATOR_REGEX],
+            [self::LIST_MEMBERS_SEPARATOR],
+            $value,
+        );
+    }
+}
-- 
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