--- /dev/null
+/*
+ * Copyright (c) 2024 PANTHEON.tech, s.r.o. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.restconf.nb.rfc8040;
+
+import static java.util.Objects.requireNonNull;
+
+import com.google.common.collect.ImmutableMap;
+import org.eclipse.jdt.annotation.NonNullByDefault;
+import org.opendaylight.restconf.api.HttpStatusCode;
+import org.opendaylight.restconf.nb.rfc8040.legacy.ErrorTags;
+import org.opendaylight.yangtools.yang.common.ErrorTag;
+
+/**
+ * Mapping of {@link ErrorTag}s to {@link HttpStatusCode}s.
+ */
+@NonNullByDefault
+public enum ErrorTagMapping {
+ /**
+ * Mapping specified by <a href="https://www.rfc-editor.org/rfc/rfc8040#page-74">RFC8040</a>:
+ * {@link ErrorTag#DATA_MISSING} is reported as {@code 409 Conflict}. This may be confusing to users, as {@code GET}
+ * requests to non-existent datastore resources do not report {@code 404 Not Found} as would be expected from any
+ * other HTTP server.
+ */
+ RFC8040(HttpStatusCode.CONFLICT),
+ /**
+ * Mapping proposed by <a href="https://www.rfc-editor.org/errata/eid5565">Errata 5565</a>:
+ * {@link ErrorTag#DATA_MISSING} is reported as {@code 404 Not Found}. This is more in-line with expectations rooted
+ * in <a href="https://www.rfc-editor.org/rfc/rfc7231#section-6.5.4">HTTP/1.1 specification</a>.
+ */
+ ERRATA_5565(HttpStatusCode.NOT_FOUND);
+
+ private ImmutableMap<ErrorTag, HttpStatusCode> tagToStatus;
+
+ ErrorTagMapping(final HttpStatusCode dataMissing) {
+ tagToStatus = ImmutableMap.<ErrorTag, HttpStatusCode>builder()
+ .put(ErrorTag.IN_USE, HttpStatusCode.CONFLICT)
+ .put(ErrorTag.INVALID_VALUE, HttpStatusCode.BAD_REQUEST)
+ .put(ErrorTag.TOO_BIG, HttpStatusCode.CONTENT_TOO_LARGE)
+ .put(ErrorTag.MISSING_ATTRIBUTE, HttpStatusCode.BAD_REQUEST)
+ .put(ErrorTag.BAD_ATTRIBUTE, HttpStatusCode.BAD_REQUEST)
+ .put(ErrorTag.UNKNOWN_ATTRIBUTE, HttpStatusCode.BAD_REQUEST)
+ .put(ErrorTag.MISSING_ELEMENT, HttpStatusCode.BAD_REQUEST)
+ .put(ErrorTag.BAD_ELEMENT, HttpStatusCode.BAD_REQUEST)
+ .put(ErrorTag.UNKNOWN_ELEMENT, HttpStatusCode.BAD_REQUEST)
+ .put(ErrorTag.UNKNOWN_NAMESPACE, HttpStatusCode.BAD_REQUEST)
+
+ .put(ErrorTag.ACCESS_DENIED, HttpStatusCode.FORBIDDEN)
+ .put(ErrorTag.LOCK_DENIED, HttpStatusCode.CONFLICT)
+ .put(ErrorTag.RESOURCE_DENIED, HttpStatusCode.CONFLICT)
+ .put(ErrorTag.ROLLBACK_FAILED, HttpStatusCode.INTERNAL_SERVER_ERROR)
+ .put(ErrorTag.DATA_EXISTS, HttpStatusCode.CONFLICT)
+ .put(ErrorTag.DATA_MISSING, dataMissing)
+
+ .put(ErrorTag.OPERATION_NOT_SUPPORTED, HttpStatusCode.NOT_IMPLEMENTED)
+ .put(ErrorTag.OPERATION_FAILED, HttpStatusCode.INTERNAL_SERVER_ERROR)
+ .put(ErrorTag.PARTIAL_OPERATION, HttpStatusCode.INTERNAL_SERVER_ERROR)
+ .put(ErrorTag.MALFORMED_MESSAGE, HttpStatusCode.BAD_REQUEST)
+ .put(ErrorTags.RESOURCE_DENIED_TRANSPORT, HttpStatusCode.SERVICE_UNAVAILABLE)
+ .build();
+ }
+
+ /**
+ * Return the HTTP {@link HttpStatusCode} corresponding to specified {@link ErrorTag}.
+ *
+ * @param tag Error tag to map
+ * @return A {@link HttpStatusCode}
+ * @throws NullPointerException if {@code tag} is null
+ */
+ public HttpStatusCode statusOf(final ErrorTag tag) {
+ final var known = tagToStatus.get(requireNonNull(tag));
+ return known != null ? known : HttpStatusCode.INTERNAL_SERVER_ERROR;
+ }
+}