    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *     http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.mail.resolver;
    018
    019import java.io.IOException;
    020import java.io.InputStream;
    021import java.net.URL;
    022
    023import javax.activation.DataSource;
    024import javax.activation.FileTypeMap;
    025import javax.mail.util.ByteArrayDataSource;
    026
    027/**
    028 * Creates a {@code DataSource} based on an class path.
    029 *
    030 * @since 1.3
    031 */
    032public class DataSourceClassPathResolver extends DataSourceBaseResolver {
    033    /** The base string of the resource relative to the classpath when resolving relative paths */
    034    private final String classPathBase;
    035
    036    /**
    037     * Constructs a new instance.
    038     */
    039    public DataSourceClassPathResolver() {
    040        this("/");
    041    }
    042
    043    /**
    044     * Constructs a new instance.
    045     *
    046     * @param classPathBase a base class path
    047     */
    048    public DataSourceClassPathResolver(final String classPathBase) {
    049        this(classPathBase, false);
    050    }
    051
    052    /**
    053     * Constructs a new instance.
    054     *
    055     * @param classPathBase a base class path
    056     * @param lenient       shall we ignore resources not found or throw an exception?
    057     */
    058    public DataSourceClassPathResolver(final String classPathBase, final boolean lenient) {
    059        super(lenient);
    060        this.classPathBase = classPathBase.endsWith("/") ? classPathBase : classPathBase + "/";
    061    }
    062
    063    /**
    064     * Gets the class path base.
    065     *
    066     * @return the classPathBase
    067     */
    068    public String getClassPathBase() {
    069        return classPathBase;
    070    }
    071
    072    /**
    073     * Returns the resource name for a given resource location.
    074     *
    075     * @param resourceLocation the resource location
    076     * @return {@link #getClassPathBase()} + {@code resourceLocation}
    077     * @see #getClassPathBase()
    078     */
    079    private String getResourceName(final String resourceLocation) {
    080        return (getClassPathBase() + resourceLocation).replace("//", "/");
    081    }
    082
    083    /** {@inheritDoc} */
    084    @Override
    085    public DataSource resolve(final String resourceLocation) throws IOException {
    086        return resolve(resourceLocation, isLenient());
    087    }
    088
    089    /** {@inheritDoc} */
    090    @Override
    091    public DataSource resolve(final String resourceLocation, final boolean isLenient) throws IOException {
    092        try {
    093            if (!isCid(resourceLocation) && !isHttpUrl(resourceLocation)) {
    094                final String mimeType = FileTypeMap.getDefaultFileTypeMap().getContentType(resourceLocation);
    095                final String resourceName = getResourceName(resourceLocation);
    096                try (InputStream inputStream = DataSourceClassPathResolver.class.getResourceAsStream(resourceName)) {
    097                    if (inputStream == null) {
    098                        if (isLenient) {
    099                            return null;
    100                        }
    101                        throw new IOException("The following class path resource was not found : " + resourceLocation);
    102                    }
    103                    final ByteArrayDataSource ds = new ByteArrayDataSource(inputStream, mimeType);
    104                    // EMAIL-125: set the name of the DataSource to the normalized resource URL
    105                    // similar to other DataSource implementations, e.g. FileDataSource, URLDataSource
    106                    final URL resource = DataSourceClassPathResolver.class.getResource(resourceName);
    107                    if (resource != null) {
    108                        ds.setName(resource.toString());
    109                    } else if (isLenient) {
    110                        return null;
    111                    } else {
    112                        throw new IOException("The following class path resource was not found : " + resourceName);
    113                    }
    114                    return ds;
    115                }
    116            }
    117            return null;
    118        } catch (final IOException e) {
    119            if (isLenient) {
    120                return null;
    121            }
    122            throw e;
    123        }
    124    }
    125}