package com.auth0.jwt.impl;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
import java.io.IOException;
import java.util.Map;
class HeaderDeserializer extends StdDeserializer<BasicHeader> {
HeaderDeserializer() {
this(null);
}
private HeaderDeserializer(Class<?> vc) {
super(vc);
}
@Override
public BasicHeader deserialize(JsonParser p, DeserializationContext ctxt) throws IOException {
Map<String, JsonNode> tree = p.getCodec().readValue(p, new TypeReference<Map<String, JsonNode>>() {
});
if (tree == null) {
throw new JWTDecodeException("Parsing the Header's JSON resulted on a Null map");
}
String algorithm = getString(tree, PublicClaims.ALGORITHM);
String type = getString(tree, PublicClaims.TYPE);
String contentType = getString(tree, PublicClaims.CONTENT_TYPE);
String keyId = getString(tree, PublicClaims.KEY_ID);
return new BasicHeader(algorithm, type, contentType, keyId, tree);
}
String getString(Map<String, JsonNode> tree, String claimName) {
JsonNode node = tree.get(claimName);
if (node == null || node.isNull()) {
return null;
}
return node.asText(null);
}
}