JsonEUID.java

/*
 * Copyright Cedar Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.cedarpolicy.serializer;

import java.util.Optional;

import com.cedarpolicy.model.exception.InvalidEUIDException;
import com.cedarpolicy.value.EntityUID;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;

/** Represent JSON format of Entity Unique Identifier. */
public class JsonEUID {
    /** euid (__entity is used as escape sequence in JSON). */
    @JsonProperty("type")
    public final String type;

    @JsonProperty("id")
    public final String id;

    /** String representation in valid Cedar syntax. */
    @Override
    public String toString() {
        try {
            ObjectMapper mapper = new ObjectMapper();
            return mapper.writeValueAsString(this);
        } catch (JsonProcessingException e) {
            throw new RuntimeException("Internal invariant violated, json encoding failed: " + e.toString());
        }
    }

    /**
     * Build JsonEUID.
     *
     * @param type Entity Type.
     * @param id   Entity ID.
     */
    public JsonEUID(String type, String id) {
        this.type = type;
        this.id = id.replace("\\\"", "\"");
    }

    @SuppressFBWarnings("CT_CONSTRUCTOR_THROW")
    public JsonEUID(String src) throws InvalidEUIDException {
        Optional<EntityUID> o = EntityUID.parse(src);
        if (o.isPresent()) {
            JsonEUID x = o.get().asJson();
            this.type = x.type;
            this.id = x.id;
        } else {
            throw new InvalidEUIDException("Invalid EUID: `" + src + "`");
        }
    }

    /** Build JsonEUID (default constructor needed by Jackson). */
    public JsonEUID() {
        this.type = "";
        this.id = "";
    }
}