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A web service test double for all occasions - standalone edition
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/*
 * Copyright (C) 2021 Thomas Akehurst
 *
 * 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 com.github.tomakehurst.wiremock.extension.responsetemplating;

import com.github.jknack.handlebars.Handlebars;
import com.github.jknack.handlebars.Helper;
import com.github.jknack.handlebars.helper.AssignHelper;
import com.github.jknack.handlebars.helper.ConditionalHelpers;
import com.github.jknack.handlebars.helper.NumberHelper;
import com.github.jknack.handlebars.helper.StringHelpers;
import com.github.tomakehurst.wiremock.common.Exceptions;
import com.github.tomakehurst.wiremock.extension.responsetemplating.helpers.SystemValueHelper;
import com.github.tomakehurst.wiremock.extension.responsetemplating.helpers.WireMockHelpers;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutionException;

public class TemplateEngine {

  private final Handlebars handlebars;
  private final Cache cache;
  private final Long maxCacheEntries;

  public TemplateEngine(
      Map> helpers, Long maxCacheEntries, Set permittedSystemKeys) {
    this(new Handlebars(), helpers, maxCacheEntries, permittedSystemKeys);
  }

  public TemplateEngine(
      Handlebars handlebars,
      Map> helpers,
      Long maxCacheEntries,
      Set permittedSystemKeys) {
    this.handlebars = handlebars;
    this.maxCacheEntries = maxCacheEntries;
    CacheBuilder cacheBuilder = CacheBuilder.newBuilder();
    if (maxCacheEntries != null) {
      cacheBuilder.maximumSize(maxCacheEntries);
    }
    cache = cacheBuilder.build();

    addHelpers(helpers, permittedSystemKeys);
  }

  private void addHelpers(Map> helpers, Set permittedSystemKeys) {
    for (StringHelpers helper : StringHelpers.values()) {
      if (!helper.name().equals("now")) {
        this.handlebars.registerHelper(helper.name(), helper);
      }
    }

    for (NumberHelper helper : NumberHelper.values()) {
      this.handlebars.registerHelper(helper.name(), helper);
    }

    for (ConditionalHelpers helper : ConditionalHelpers.values()) {
      this.handlebars.registerHelper(helper.name(), helper);
    }

    this.handlebars.registerHelper(AssignHelper.NAME, new AssignHelper());

    // Add all available wiremock helpers
    for (WireMockHelpers helper : WireMockHelpers.values()) {
      this.handlebars.registerHelper(helper.name(), helper);
    }

    this.handlebars.registerHelper(
        "systemValue", new SystemValueHelper(new SystemKeyAuthoriser(permittedSystemKeys)));

    for (Map.Entry> entry : helpers.entrySet()) {
      this.handlebars.registerHelper(entry.getKey(), entry.getValue());
    }
  }

  public HandlebarsOptimizedTemplate getTemplate(final Object key, final String content) {
    if (maxCacheEntries != null && maxCacheEntries < 1) {
      return getUncachedTemplate(content);
    }

    try {
      return cache.get(key, () -> new HandlebarsOptimizedTemplate(handlebars, content));
    } catch (ExecutionException e) {
      return Exceptions.throwUnchecked(e, HandlebarsOptimizedTemplate.class);
    }
  }

  public HandlebarsOptimizedTemplate getUncachedTemplate(final String content) {
    return new HandlebarsOptimizedTemplate(handlebars, content);
  }

  public long getCacheSize() {
    return cache.size();
  }

  public void invalidateCache() {
    cache.invalidateAll();
  }

  public Long getMaxCacheEntries() {
    return maxCacheEntries;
  }
}