private function calcCanonicalRequest()

in src/Signer/SignerV4.php [247:316]
53 lines of code
10 McCabe index (conditional complexity)

    private function calcCanonicalRequest(SigningContext $signingCtx, array $additionalHeaders): string
    {
        $request = $signingCtx->request;
        // Canonical Request
        // HTTP Verb + "\n" +
        // Canonical URI + "\n" +
        // Canonical Query String + "\n" +
        // Canonical Headers + "\n" +
        // Additional Headers + "\n" +
        // Hashed PayLoad

        // Canonical Uri
        $uri = "/";
        if (isset($signingCtx->bucket)) {
            $uri .= $signingCtx->bucket . "/";
        }
        if (isset($signingCtx->key)) {
            $uri .= $signingCtx->key;
        }
        $canonicalUri = str_replace(array('%2F'), array('/'), rawurlencode($uri));
        // Canonical Query
        $query = Query::parse($request->getUri()->getQuery(), false);
        ksort($query);
        $canonicalQuery = '';
        foreach ($query as $k => $v) {
            if (!empty($canonicalQuery)) {
                $canonicalQuery .= '&';
            }
            $canonicalQuery .= $k;
            if ($v != '') {
                $canonicalQuery .= '=' . $v;
            }
        }
        // Canonical Headers
        $headers = [];
        $addHeadersMap = array_map('strtolower', $additionalHeaders);
        foreach (array_keys($request->getHeaders()) as $k) {
            $lowk = strtolower((string)$k);
            if ($this->isSignedHeader($lowk)) {
                $headers[] = $lowk;
            } elseif (in_array($lowk, $addHeadersMap, true)) {
                $headers[] = $lowk;
            }
        }
        sort($headers);
        $canonicalHeaders = '';
        foreach ($headers as $k) {
            $headerValues = array_map('trim', $request->getHeader($k));
            $canonicalHeaders .= $k . ':' . implode(',', $headerValues) . "\n";
        }

        // Additional Headers
        $canonicalAdditionalHeaders = implode(';', $additionalHeaders);
        // Assuming unsignedPayload is defined somewhere in the class
        $hashPayload = self::UNSIGNED_PAYLOAD;
        if (!empty($request->getHeaderLine(self::CONTENT_SHA256_HEADER))) {
            $hashPayload = $request->getHeaderLine(self::CONTENT_SHA256_HEADER);
        }

        // Build Canonical Request
        $canonicalRequest =
            $request->getMethod() . "\n" .
            $canonicalUri . "\n" .
            $canonicalQuery . "\n" .
            $canonicalHeaders . "\n" .
            $canonicalAdditionalHeaders . "\n" .
            $hashPayload;

        return $canonicalRequest;
    }