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Add case insensitive auth schemes #134

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40 changes: 28 additions & 12 deletions ...bel/src/main/java/de/gematik/rbellogger/facets/http/RbelAuthorizationHeaderConverter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -26,35 +26,51 @@
import de.gematik.rbellogger.data.core.RbelNoteFacet;
import de.gematik.rbellogger.data.core.RbelNoteFacet.NoteStyling;
import de.gematik.rbellogger.util.RbelContent;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.stream.IntStream;
import lombok.val;

public class RbelAuthorizationHeaderConverter extends RbelConverterPlugin {
private static final byte[] BEARER_TOKEN_PREFIX = "Bearer ".getBytes(StandardCharsets.UTF_8);
private static final byte[] DPOP_TOKEN_PREFIX = "DPoP ".getBytes(StandardCharsets.UTF_8);
private static final byte[] BASIC_PREFIX = "Basic ".getBytes(StandardCharsets.UTF_8);

private static final String BEARER_SCHEME = "Bearer";
private static final String DPOP_SCHEME = "DPoP";
private static final String BASIC_SCHEME = "Basic";

private static int getCredentialsOffset(String scheme) {
return scheme.length() + 1;
}

private static boolean startsWithAuthSchemeIgnoreCase(RbelContent content, String scheme) {
if (content.size() <= scheme.length() || content.get(scheme.length()) != ' ') {
return false;
}

return IntStream.range(0, scheme.length())
.allMatch(i -> equalsAsciiIgnoreCase(content.get(i), scheme.charAt(i)));
}

private static boolean equalsAsciiIgnoreCase(byte actual, char expected) {
return Character.toLowerCase((char) actual) == Character.toLowerCase(expected);
}

@Override
public void consumeElement(RbelElement rbelElement, RbelConversionExecutor converter) {
var content = rbelElement.getContent();
if (content.startsWith(BEARER_TOKEN_PREFIX)) {
if (startsWithAuthSchemeIgnoreCase(content, BEARER_SCHEME)) {
val bearerTokenElement =
RbelElement.create(
content.subArray(BEARER_TOKEN_PREFIX.length, content.size()), rbelElement);
RbelElement.create(content.subArray(getCredentialsOffset(BEARER_SCHEME), content.size()), rbelElement);
rbelElement.addFacet(new RbelBearerTokenFacet(bearerTokenElement));
converter.convertElement(bearerTokenElement);
} else if (content.startsWith(DPOP_TOKEN_PREFIX)) {
} else if (startsWithAuthSchemeIgnoreCase(content, DPOP_SCHEME)) {
val dpopTokenElement =
RbelElement.create(
content.subArray(DPOP_TOKEN_PREFIX.length, content.size()), rbelElement);
RbelElement.create(content.subArray(getCredentialsOffset(DPOP_SCHEME), content.size()), rbelElement);
rbelElement.addFacet(new RbelDpopTokenFacet(dpopTokenElement));
converter.convertElement(dpopTokenElement);
} else if (content.startsWith(BASIC_PREFIX)) {
} else if (startsWithAuthSchemeIgnoreCase(content, BASIC_SCHEME)) {
val cleartextContent =
RbelContent.of(
Base64.getDecoder()
.decode(content.subArray(BASIC_PREFIX.length, content.size()).toByteArray()));
.decode(content.subArray(getCredentialsOffset(BASIC_SCHEME), content.size()).toByteArray()));
val colonPosition = cleartextContent.indexOf((byte) ':');
if (colonPosition != -1) {
val username = RbelElement.create(cleartextContent.subArray(0, colonPosition), rbelElement);
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