commit

vendor/guzzlehttp/guzzle/src/Handler/HeaderProcessor.php

@@ -0,0 +1,97 @@
+<?php
+
+namespace GuzzleHttp\Handler;
+
+use GuzzleHttp\Utils;
+
+/**
+ * @internal
+ */
+final class HeaderProcessor
+{
+    /**
+     * Returns the HTTP version, status code, reason phrase, and headers.
+     *
+     * @param string[] $headers
+     *
+     * @return array{0:string, 1:int, 2:?string, 3:array}
+     *
+     * @throws \RuntimeException
+     */
+    public static function parseHeaders(array $headers): array
+    {
+        if ($headers === []) {
+            throw new \RuntimeException('Expected a non-empty array of header data');
+        }
+
+        $headers = self::getLastHeaderBlock(\array_values($headers));
+
+        $statusLine = \array_shift($headers);
+        if ($statusLine === null) {
+            throw new \RuntimeException('Expected a non-empty array of header data');
+        }
+
+        $parts = \explode(' ', $statusLine, 3);
+        $version = \explode('/', $parts[0])[1] ?? null;
+
+        if ($version === null) {
+            throw new \RuntimeException('HTTP version missing from header data');
+        }
+
+        $status = $parts[1] ?? null;
+
+        if ($status === null) {
+            throw new \RuntimeException('HTTP status code missing from header data');
+        }
+
+        if (!\preg_match('/^\d{3}$/D', $status)) {
+            throw new \RuntimeException('HTTP status code is invalid');
+        }
+
+        foreach ($headers as $header) {
+            if (\strpos($header, ':') === false) {
+                throw new \RuntimeException('HTTP header line is invalid');
+            }
+        }
+
+        return [$version, (int) $status, $parts[2] ?? null, Utils::headersFromLines($headers)];
+    }
+
+    public static function isStatusLineCandidate(string $line): bool
+    {
+        return \preg_match('/^HTTP\/[0-9]+(?:\.[0-9]+)? [0-9]{3}(?: [^\r\n]*)?(?:\r\n|\r|\n)?$/iD', $line) === 1;
+    }
+
+    public static function isValidHeaderFieldLine(string $line): bool
+    {
+        $parts = \explode(':', $line, 2);
+
+        if (!isset($parts[1])) {
+            return false;
+        }
+
+        if (!\preg_match('/^[a-zA-Z0-9\'`#$%&*+.^_|~!-]+$/D', $parts[0])) {
+            return false;
+        }
+
+        return \preg_match('/^[\x20\x09\x21-\x7E\x80-\xFF]*(?:\r\n|\r|\n)?$/D', \trim($parts[1], " \t")) === 1;
+    }
+
+    /**
+     * @param non-empty-list<string> $headers
+     *
+     * @return list<string>
+     */
+    private static function getLastHeaderBlock(array $headers): array
+    {
+        $lastStatusLine = 0;
+
+        foreach ($headers as $index => $line) {
+            if (self::isStatusLineCandidate($line)) {
+                $lastStatusLine = $index;
+            }
+        }
+
+        return \array_slice($headers, $lastStatusLine);
+    }
+}