1 files changed, 46 insertions, 0 deletions
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,
+        );
+    }
+}