content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.camel.k.support;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.Reader;
  import java.nio.charset.Charset;
  import java.util.Base64;
  import java.util.Collections;
  import java.util.List;
  import java.util.Map;
  import java.util.Optional;
  import java.util.UUID;
  import java.util.zip.GZIPInputStream;
  
  import org.apache.camel.CamelContext;
  import org.apache.camel.k.Source;
  import org.apache.camel.k.SourceDefinition;
  import org.apache.camel.k.SourceType;
  import org.apache.camel.spi.Resource;
  import org.apache.camel.support.ResourceHelper;
  import org.apache.camel.util.ObjectHelper;
  import org.apache.camel.util.URISupport;
  
  public final class  Sources {
  
      private Sources() {
      }
  
      public static Source fromURI(String uri) throws Exception {
          return fromDefinition(computeDefinitionFromURI(uri));
      }
  
      public static SourceDefinition fromBytes(String id, String name, String language, String loader, List<String> interceptors, byte[] content) {
          SourceDefinition answer = new SourceDefinition();
          answer.setId(id);
          answer.setName(name);
          answer.setLanguage(language);
          answer.setLoader(loader);
          answer.setInterceptors(interceptors != null ? interceptors : Collections.emptyList());
          answer.setContent(content);
  
          return answer;
      }
  
      public static Source fromBytes(String name, String language, String loader, List<String> interceptors, byte[] content) {
          return fromDefinition(fromBytes(null, name, language, loader, interceptors, content));
      }
  
      public static Source fromBytes(String name, String language, String loader, byte[] content) {
          return fromDefinition(fromBytes(null, name, language, loader, null, content));
      }
  
      public static Source fromBytes(String language, byte[] content) {
          return fromDefinition(fromBytes(null, UUID.randomUUID().toString(), language, null, null, content));
      }
  
      public static Source fromDefinition(SourceDefinition definition) {
          if (definition.getLocation() == null && definition.getContent() == null) {
              throw new IllegalArgumentException("Either the source location or the source content should be set");
          }
          return new Source() {
              @Override
              public String getLocation() {
                  return definition.getLocation();
              }
  
              @Override
              public String getId() {
                  return ObjectHelper.supplyIfEmpty(definition.getId(), this::getName);
              }
  
              @Override
              public String getName() {
                  String answer = definition.getName();
                  if (ObjectHelper.isEmpty(answer) && ObjectHelper.isNotEmpty(definition.getLocation())) {
                      answer = StringSupport.substringAfter(definition.getLocation(), ":");
                      answer = StringSupport.substringBeforeLast(answer, ".");
  
                      if (answer.contains("/")) {
                          answer = StringSupport.substringAfterLast(answer, "/");
                      }
                  }
  
                  return answer;
              }
  
              @Override
              public String getLanguage() {
                  String answer = definition.getLanguage();
                  if (ObjectHelper.isEmpty(answer) && ObjectHelper.isNotEmpty(definition.getLocation())) {
                      answer = StringSupport.substringAfterLast(definition.getLocation(), ":");
                      answer = StringSupport.substringAfterLast(answer, ".");
                  }
  
                  return answer;
              }
  
              @Override
              public SourceType getType() {
                  return ObjectHelper.supplyIfEmpty(definition.getType(), () -> SourceType.source);
              }
  
              @Override
              public Optional<String> getLoader() {
                  return Optional.ofNullable(definition.getLoader());
              }
  
              @Override
              public List<String> getInterceptors() {
                  return ObjectHelper.supplyIfEmpty(definition.getInterceptors(), Collections::emptyList);
              }
  
              @Override
              public List<String> getPropertyNames() {
                  return ObjectHelper.supplyIfEmpty(definition.getPropertyNames(), Collections::emptyList);
              }
  
              /**
               * Read the content of the source as {@link InputStream}.
               *
               * @param ctx the {@link CamelContext}
               * @return the {@link InputStream} representing the source content
               */
              @Override
              public InputStream resolveAsInputStream(CamelContext ctx) {
                  try {
                      InputStream is;
  
                      if (definition.getContent() != null) {
                          is = new ByteArrayInputStream(definition.getContent());
                      } else {
                          is = ResourceHelper.resolveMandatoryResourceAsInputStream(ctx, definition.getLocation());
                      }
  
                      return definition.isCompressed()
                          ? new GZIPInputStream(Base64.getDecoder().wrap(is))
                          : is;
                  } catch (Exception e) {
                      throw new RuntimeException(e);
                  }
              }
          };
      }
  
      // ******************************
      //
      // Helpers
      //
      // ******************************
  
      public static Resource asResource(CamelContext camelContext, Source source) {
          return new Resource() {
              @Override
              public String getLocation() {
                  return source.getLocation();
              }
  
              @Override
              public boolean exists() {
                  return true;
              }
  
              @Override
              public InputStream getInputStream() throws IOException {
                  return source.resolveAsInputStream(camelContext);
              }
  
              @Override
              public Reader getReader() throws Exception {
                  return source.resolveAsReader(camelContext);
              }
  
              @Override
              public Reader getReader(Charset charset) throws Exception {
                  return source.resolveAsReader(camelContext, charset);
              }
  
              @Override
              public String getScheme() {
                  return source.getLocation();
              }
          };
      }
  
      public static SourceDefinition computeDefinitionFromURI(String uri) throws Exception {
          final String location = StringSupport.substringBefore(uri, "?");
  
          if (!location.startsWith(Constants.SCHEME_PREFIX_CLASSPATH) && !location.startsWith(Constants.SCHEME_PREFIX_FILE)) {
              throw new IllegalArgumentException("No valid resource format, expected scheme:path, found " + uri);
          }
  
          final String query = StringSupport.substringAfter(uri, "?");
          final Map<String, Object> params = URISupport.parseQuery(query);
  
          String language = (String) params.get("language");
          if (ObjectHelper.isEmpty(language)) {
              language = StringSupport.substringAfterLast(location, ":");
              language = StringSupport.substringAfterLast(language, ".");
          }
          if (ObjectHelper.isEmpty(language)) {
              throw new IllegalArgumentException("Unknown language " + language);
          }
  
          String name = (String) params.get("name");
          if (name == null) {
              name = StringSupport.substringAfter(location, ":");
              name = StringSupport.substringBeforeLast(name, ".");
  
              if (name.contains("/")) {
                  name = StringSupport.substringAfterLast(name, "/");
              }
          }
  
          SourceDefinition answer = new SourceDefinition();
          answer.setId((String) params.get("id"));
          answer.setLocation(location);
          answer.setName(name);
          answer.setLanguage(language);
          answer.setLoader((String) params.get("loader"));
          answer.setInterceptors(StringSupport.split((String) params.get("interceptors"), ","));
          answer.setCompressed(Boolean.parseBoolean((String) params.get("compression")));
  
          return answer;
      }
  }
  