io.macgyver.core.resource.provider.filesystem.FileSystemResourceProvider.java Source code

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Here is the source code for io.macgyver.core.resource.provider.filesystem.FileSystemResourceProvider.java

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/**
 * 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.macgyver.core.resource.provider.filesystem;

import io.macgyver.core.Bootstrap;
import io.macgyver.core.resource.Resource;
import io.macgyver.core.resource.ResourceMatcher;
import io.macgyver.core.resource.ResourceProvider;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.TreeTraverser;
import com.google.common.io.Files;

public class FileSystemResourceProvider extends ResourceProvider {
    Logger logger = LoggerFactory.getLogger(FileSystemResourceProvider.class);
    File rootDir;

    public FileSystemResourceProvider(File rootDir) {
        this.rootDir = rootDir;
    }

    public boolean isApprovedPath(File f) {
        try {
            if (f.getAbsolutePath().contains(".git/")) {
                return false;
            }

            File approvedParent = rootDir.getCanonicalFile();
            while (f != null) {
                f = f.getCanonicalFile();
                if (f.equals(approvedParent)) {
                    return true;
                }
                f = f.getParentFile();
            }
        } catch (Exception e) {
            logger.warn("", e);
        }
        return false;
    }

    @Override
    public Iterable<Resource> findResources(ResourceMatcher matcher) throws IOException {
        Preconditions.checkNotNull(matcher);
        List<Resource> tmp = Lists.newArrayList();
        TreeTraverser<File> tt = Files.fileTreeTraverser();
        String rootPath = rootDir.getCanonicalPath();
        for (File f : tt.breadthFirstTraversal(rootDir.getCanonicalFile())) {
            if (f.isFile() && isApprovedPath(f)) {
                String canonicalPath = f.getCanonicalPath();

                String virtualPath = canonicalPath;
                if (canonicalPath.startsWith(rootPath)) {
                    virtualPath = canonicalPath.substring(rootPath.length());
                }
                while (virtualPath.startsWith("/")) {
                    virtualPath = virtualPath.substring(1);
                }
                virtualPath = removePrefix(virtualPath);
                FileSystemResource fsr = new FileSystemResource(this, virtualPath, f.getCanonicalFile());
                if (matcher.matches(fsr)) {
                    tmp.add(fsr);
                }
            }
        }

        return tmp;
    }

    @Override
    public Resource getResourceByPath(String path) throws IOException {
        String translatedPath = addPrefix(path);
        File f = new File(rootDir, translatedPath);
        if (logger.isDebugEnabled()) {
            logger.debug("looking for: {}", f);
        }
        if (!f.exists()) {
            throw new FileNotFoundException(f.getAbsolutePath());
        }
        FileSystemResource fsr = new FileSystemResource(this, path, f);
        return fsr;
    }

    @Override
    public void refresh() {
        // no-op
    }

}