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[Communication]: Remove state variable in HmacAuthenticationPolicy #21932

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May 28, 2021
Merged

[Communication]: Remove state variable in HmacAuthenticationPolicy #21932

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28 changes: 13 additions & 15 deletions ...src/main/java/com/azure/communication/common/implementation/HmacAuthenticationPolicy.java
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Original file line number Diff line number Diff line change
Expand Up @@ -58,8 +58,6 @@ public final class HmacAuthenticationPolicy implements HttpPipelinePolicy {
DateTimeFormatter.ofPattern("E, dd MMM yyyy HH:mm:ss 'GMT'", Locale.US);

private final AzureKeyCredential credential;

private Mac sha256HMAC;
private final ClientLogger logger = new ClientLogger(HmacAuthenticationPolicy.class);

/**
Expand All @@ -72,18 +70,7 @@ public HmacAuthenticationPolicy(AzureKeyCredential clientCredential) {
}

@Override
public synchronized Mono<HttpResponse> process(HttpPipelineCallContext context, HttpPipelineNextPolicy next) {
String accessKey = credential.getKey();
byte[] key = Base64.getDecoder().decode(accessKey);
Mac sha256HMAC;
try {
sha256HMAC = Mac.getInstance("HmacSHA256");
sha256HMAC.init(new SecretKeySpec(key, "HmacSHA256"));
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
throw logger.logExceptionAsError(new RuntimeException(e));
}
this.sha256HMAC = sha256HMAC;

public Mono<HttpResponse> process(HttpPipelineCallContext context, HttpPipelineNextPolicy next) {
final Flux<ByteBuffer> contents = context.getHttpRequest().getBody() == null
? Flux.just(ByteBuffer.allocate(0))
: context.getHttpRequest().getBody();
Expand Down Expand Up @@ -136,7 +123,7 @@ private Map<String, String> addAuthenticationHeaders(final URL url,
return headers;
}

private synchronized void addSignatureHeader(final URL url, final String httpMethod, final Map<String, String> httpHeaders) {
private void addSignatureHeader(final URL url, final String httpMethod, final Map<String, String> httpHeaders) {
final String signedHeaderNames = String.join(";", SIGNED_HEADERS);
final String signedHeaderValues = Arrays.stream(SIGNED_HEADERS)
.map(httpHeaders::get)
Expand All @@ -150,6 +137,17 @@ private synchronized void addSignatureHeader(final URL url, final String httpMet
// String-To-Sign=HTTP_METHOD + '\n' + path_and_query + '\n' + signed_headers_values
// The line separator has to be \n. Using %n with String.format will result in a 401 from the service.
String stringToSign = httpMethod.toUpperCase(Locale.US) + "\n" + pathAndQuery + "\n" + signedHeaderValues;

String accessKey = credential.getKey();
byte[] key = Base64.getDecoder().decode(accessKey);
Mac sha256HMAC;
try {
sha256HMAC = Mac.getInstance("HmacSHA256");
sha256HMAC.init(new SecretKeySpec(key, "HmacSHA256"));
} catch (NoSuchAlgorithmException | InvalidKeyException e) {
throw logger.logExceptionAsError(new RuntimeException(e));
}

final String signature =
Base64.getEncoder().encodeToString(sha256HMAC.doFinal(stringToSign.getBytes(StandardCharsets.UTF_8)));
httpHeaders.put(AUTHORIZATIONHEADERNAME, String.format(HMACSHA256FORMAT, signedHeaderNames, signature));
Expand Down