io.knotx.fragments.action.library.http.request.EndpointPlaceholdersResolver Maven / Gradle / Ivy

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/*
 * Copyright (C) 2019 Knot.x Project
 *
 * 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
 *
 *     http://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 io.knotx.fragments.action.library.http.request;

import io.knotx.fragments.api.FragmentContext;
import io.knotx.server.common.placeholders.PlaceholdersResolver;
import io.knotx.server.common.placeholders.SourceDefinitions;
import io.vertx.core.json.JsonArray;
import io.vertx.core.json.JsonObject;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import org.apache.commons.lang3.StringUtils;

class EndpointPlaceholdersResolver {

  private static final String PLACEHOLDER_PREFIX_PAYLOAD = "payload";
  private static final String PLACEHOLDER_PREFIX_CONFIG = "config";

  private final SourceDefinitions sourceDefinitions;

  EndpointPlaceholdersResolver(FragmentContext fragmentContext) {
    sourceDefinitions = buildSourceDefinitions(fragmentContext);
  }

  String resolve(String input) {
    return PlaceholdersResolver.resolve(input, sourceDefinitions);
  }

  JsonObject resolve(JsonObject input) {
    JsonObject output = new JsonObject();
    input.forEach(entry -> output.put(resolveNotEmpty(entry.getKey()), resolveInternal(entry.getValue())));
    return output;
  }

  String resolveAndEncode(String input) {
    return PlaceholdersResolver.resolveAndEncode(input, sourceDefinitions);
  }

  private SourceDefinitions buildSourceDefinitions(FragmentContext context) {
    return SourceDefinitions.builder()
        .addClientRequestSource(context.getClientRequest())
        .addJsonObjectSource(context.getFragment()
            .getPayload(), PLACEHOLDER_PREFIX_PAYLOAD)
        .addJsonObjectSource(context.getFragment()
            .getConfiguration(), PLACEHOLDER_PREFIX_CONFIG)
        .build();
  }

  private String resolveNotEmpty(String input) {
    return Optional.of(input)
        .map(this::resolve)
        .filter(StringUtils::isNotEmpty)
        .orElseThrow(() -> new IllegalStateException(
            String.format("Resolving [%s] resulted in a forbidden empty string", input)));
  }

  private Object resolveInternal(Object object) {
    if (object instanceof JsonObject) {
      return resolve((JsonObject) object);
    } else if (object instanceof JsonArray) {
      JsonArray array = (JsonArray) object;
      List