Subversion Repositories general

package ak.photoalbum.logic;

import java.util.List;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Map;

import java.util.Hashtable;

import java.util.Iterator;

import java.io.File;

import java.io.IOException;

import java.io.FileInputStream;

import java.io.OutputStream;

import java.io.FileNotFoundException;

import java.net.URLEncoder;

import org.xml.sax.SAXException;

import org.apache.commons.digester.Digester;

import org.apache.log4j.Logger;

import ak.photoalbum.util.FileUtils;

import ak.photoalbum.util.TimestampRecipient;

import ak.photoalbum.util.ResourceFactory;

import ak.photoalbum.config.ConfigRoot;

import ak.photoalbum.config.ConfigBranch;

import ak.photoalbum.config.ConfigDirThumbnail;

public class Logic

{

  protected static final String URL_ENCODING    = "UTF-8";

  protected static final String META_FILE_NAME  = "meta.xml"; // FIXME make configurable (?)

  private static final Logger logger = Logger.getLogger(Logic.class);

  protected ConfigRoot   config;

  protected Map          branches           = new Hashtable(); // <String, Branch>

  protected Digester     configDigester     = createConfigDigester();

  protected Digester     metaDigester       = createMetaDigester();

  protected Logic()

  {

  }

  protected Digester createConfigDigester()

  {

    Digester digester = new Digester();

    digester.setValidating(false);

    digester.addObjectCreate(      "photos",                                ConfigRoot.class);

    digester.addBeanPropertySetter("photos/default-branch",                 "defaultBranch");

    digester.addObjectCreate(      "photos/branch",                         ConfigBranch.class);

    digester.addBeanPropertySetter("photos/branch/uri");

    digester.addBeanPropertySetter("photos/branch/images-root",             "imagesRoot");

    digester.addBeanPropertySetter("photos/branch/cache-dir",               "cacheDir");

    digester.addBeanPropertySetter("photos/branch/thumbnail-format",        "thumbnailFormat");

    digester.addBeanPropertySetter("photos/branch/columns");

    digester.addBeanPropertySetter("photos/branch/rows");

    digester.addCallMethod(        "photos/branch/images-mask",             "addImagesMask",

      0, new Class[] { String.class });

    digester.addBeanPropertySetter("photos/branch/dir-thumbnail/template",  "dirTemplate");

    digester.addObjectCreate(      "photos/branch/dir-thumbnail/thumbnail", ConfigDirThumbnail.class);

    digester.addBeanPropertySetter("photos/branch/dir-thumbnail/thumbnail/left");

    digester.addBeanPropertySetter("photos/branch/dir-thumbnail/thumbnail/top");

    digester.addBeanPropertySetter("photos/branch/dir-thumbnail/thumbnail/width");

    digester.addBeanPropertySetter("photos/branch/dir-thumbnail/thumbnail/height");

    digester.addBeanPropertySetter("photos/branch/dir-thumbnail/thumbnail/align");

    digester.addBeanPropertySetter("photos/branch/dir-thumbnail/thumbnail/valign");

    digester.addSetNext(           "photos/branch/dir-thumbnail/thumbnail", "addDirThumbnail");

    digester.addSetNext(           "photos/branch",                         "addBranch");

    return digester;

  }

  protected Digester createMetaDigester()

  {

    Digester digester = new Digester();

    digester.setValidating(false);

    digester.addObjectCreate("meta", MetaInfo.class);

    digester.addObjectCreate("meta/item", MetaInfoItem.class);

    digester.addSetProperties("meta/item", "id", "id");

    digester.addBeanPropertySetter("meta/item/title", "title");

    digester.addBeanPropertySetter("meta/item/subtitle", "subtitle");

    digester.addSetProperties("meta/item/subtitle", "mime", "subtitleMime");

    digester.addBeanPropertySetter("meta/item/comment", "comment");

    digester.addSetProperties("meta/item/comment", "mime", "commentMime");

    digester.addSetNext("meta/item", "addItem");

    return digester;

  }

  public void init(ResourceFactory resourceFactory, String configPath)

    throws IOException, SAXException, LogicException

  {

    logger.info("starting");

    config = (ConfigRoot)configDigester.parse(resourceFactory.getAsStream(configPath));

    for(Iterator i = config.getBranches().iterator(); i.hasNext(); ) {

      Branch branch = new Branch(resourceFactory, (ConfigBranch)i.next());

      branches.put(branch.getUri(), branch);

    }

    logger.info("started");

  }

  public Branch getBranch(String uri)

    throws LogicException

  {

    if(uri == null || uri.equals("")) {

      uri = config.getDefaultBranch();

      if(uri == null)

        throw new LogicException("No default branch configured");

    }

    Branch branch = (Branch)branches.get(uri);

    if(branch == null) 

      throw new LogicException("Branch not found");

    return branch;

  }

  public void buildCache(String uri)

    throws IOException, LogicException

  {

    getBranch(uri).getThumbnailer().buildCache();

  }

  public void rebuildCache(String uri)

    throws IOException, LogicException

  {

    getBranch(uri).getThumbnailer().rebuildCache();

  }

  public void deleteCache(String uri)

    throws IOException, LogicException

  {

    getBranch(uri).getThumbnailer().deleteCache();

  }

  public void reloadCache(String uri)

    throws IOException, LogicException

  {

    getBranch(uri).getThumbnailer().reloadCache();

  }

  public void getEntry(String uri, String path, IndexEntry page,

      IndexEntry index, IndexEntry prev, IndexEntry current, IndexEntry next)

    throws IOException, SAXException, LogicException

  {

    Branch branch = getBranch(uri);

    File   file   = new File(branch.getImagesRoot(), path);

    securePath(branch.getImagesRoot(), file);

    if(!file.exists())

      throw new FileNotFoundException(

        "[" + file.getCanonicalPath() + "] not found");

    File   dir      = file.getParentFile();

    File[] children = dir.listFiles(branch.getImagesFilter());

    int    pos;

    Arrays.sort(children, branch.getFileNameComparator());

    pos = Arrays.binarySearch(children, file, branch.getFileNameComparator());

    if(pos < 0)

      throw new FileNotFoundException("[" + file.getCanonicalPath()

        + "] not found in [" + dir.getCanonicalPath() + "]");

    // calc page number in index

    index.setPage(pos / branch.getColumns() / branch.getRows());

    branch.getMetaInfos().clear();     // FIXME make this more intelligent

    setEntryInfo(branch, page,    file, false);

    setEntryInfo(branch, current, file, true);

    setEntryInfo(branch, index,   dir,  true);

    if(pos > 0)                 setEntryInfo(branch, prev, children[pos-1], true);

    if(pos < children.length-1) setEntryInfo(branch, next, children[pos+1], true);

  }

  protected void setEntryInfo(Branch branch, IndexEntry entry, File file, boolean small)

    throws IOException, SAXException

  {

    String title = file.getName();

    int[]  size;

    String path  = getPath(branch, file);

    if(file.isDirectory()) {

      size = branch.getThumbnailer().getDirSize(file);

    }

    else {

      title = FileUtils.extractFileName(title);

      if(small)

        size = branch.getThumbnailer().getSmallSize(file);

      else

        size = branch.getThumbnailer().getMediumSize(file);

    }

    entry.setFile(file);

    entry.setPath(path == null ? null : URLEncoder.encode(path, URL_ENCODING));

    entry.setTitle(title);

    entry.setIsDir(file.isDirectory());

    entry.setWidth(size[0]);

    entry.setHeight(size[1]);

    MetaInfoItem meta = findMetaInfo(branch, branch.getImagesRoot(), file);

    if(meta != null) {

      if(meta.getTitle() != null) {

        entry.setTitle(meta.getTitle());

      }

      if(meta.getSubtitle() != null) {

        entry.setSubtitle(meta.getSubtitle());

        entry.setSubtitleMime(meta.getSubtitleMime());

      }

      if(meta.getComment() != null) {

        entry.setComment(meta.getComment());

        entry.setCommentMime(meta.getCommentMime());

      }

    }

  }

  public String getThumbnailMime(String uri)

    throws LogicException

  {

    return getBranch(uri).getThumbnailer().getMime();

  }

  public String getOriginMime(String uri, String path)

    throws IOException, LogicException

  {

    Branch branch = getBranch(uri);

    File   file   = new File(branch.getImagesRoot(), path);

    if(!file.exists()) return null;

    securePath(branch.getImagesRoot(), file);

    return FileUtils.getMime(FileUtils.extractFileExt(path));

  }

  public boolean writeDir(String uri, String path, long ifModifiedSince,

      OutputStream out, TimestampRecipient timestampRecipient)

    throws IOException, LogicException

  {

    Branch branch = getBranch(uri);

    File   file   = new File(branch.getImagesRoot(), path);

    securePath(branch.getImagesRoot(), file);

    return branch.getThumbnailer().writeDir(file, ifModifiedSince, out, timestampRecipient);

  }

  public boolean writeSmall(String uri, String path, long ifModifiedSince,

      OutputStream out, TimestampRecipient timestampRecipient)

    throws IOException, LogicException

  {

    Branch branch = getBranch(uri);

    File   file   = new File(branch.getImagesRoot(), path);

    securePath(branch.getImagesRoot(), file);

    return branch.getThumbnailer().writeSmall(file, ifModifiedSince, out, timestampRecipient);

  }

  public boolean writeMedium(String uri, String path, long ifModifiedSince,

      OutputStream out, TimestampRecipient timestampRecipient)

    throws IOException, LogicException

  {

    Branch branch = getBranch(uri);

    File   file   = new File(branch.getImagesRoot(), path);

    securePath(branch.getImagesRoot(), file);

    return branch.getThumbnailer().writeMedium(file, ifModifiedSince, out, timestampRecipient);

  }

  public boolean writeOrigin(String uri, String path, long ifModifiedSince,

      OutputStream out, TimestampRecipient timestampRecipient)

    throws IOException, LogicException

  {

    Branch          branch = getBranch(uri);

    FileInputStream in     = null;

    File            file   = new File(branch.getImagesRoot(), path);

    securePath(branch.getImagesRoot(), file);

    if(ifModifiedSince >= 0 && ifModifiedSince <= file.lastModified()) return false;

    if(timestampRecipient != null) {

      timestampRecipient.setTimestamp(file.lastModified());

    }

    try {

      in  = new FileInputStream(file);

      FileUtils.copyStreams(in, out);

    }

    finally {

      if(in != null) in.close();

    }

    return true;

  }

  protected MetaInfo getMetaInfo(Branch branch, File dir)

    throws IOException, SAXException

  {

    MetaInfo meta = (MetaInfo)branch.getMetaInfos().get(dir);

    if(meta != null) return meta;

    File metaFile = new File(dir, META_FILE_NAME);

    if(!metaFile.exists()) return null;

    meta = (MetaInfo)metaDigester.parse(new FileInputStream(metaFile));

    meta.setDir(dir);

    branch.getMetaInfos().put(dir, meta);

    return meta;

  }

  protected MetaInfoItem findMetaInfo(Branch branch, File rootDir, File file)

    throws IOException, SAXException

  {

    file    = file.getCanonicalFile();

    rootDir = rootDir.getCanonicalFile();

    File dir = file;

    if(!dir.isDirectory())

      dir = dir.getParentFile();

    MetaInfoItem metaItem = null;

    for(; metaItem == null; dir = dir.getParentFile()) {

      if(dir == null) break;

      MetaInfo meta = getMetaInfo(branch, dir);

      if(meta != null) {

        metaItem = meta.findItem(file);

      }

      if(rootDir.equals(dir)) break;

    }

    return metaItem;

  }

  public boolean listDirectory(String uri, String dirName, int page, List table, List pages)

    throws IOException, LogicException, SAXException

  {

    Branch branch = getBranch(uri);

    File   dir    = new File(branch.getImagesRoot(), dirName);

    securePath(branch.getImagesRoot(), dir);

    if(!dir.exists()) return false;

    File[] children  = dir.listFiles(branch.getImagesFilter());

    int    pos       = page * branch.getColumns() * branch.getRows();

    Arrays.sort(children, branch.getFileNameComparator());

    branch.getMetaInfos().clear();           // FIXME do this more intelligent (?)

    // the pages list

    pages.clear();

    for(int i = 0; i < (int)Math.ceil((double)children.length / branch.getColumns() / branch.getRows()); i++) {

      pages.add(new PageItem(i, i == page));

    }

    // the main table

    table.clear();

    while(pos < children.length && pos < (page+1) * branch.getColumns() * branch.getRows()) {

      List row    = new ArrayList();

      int  rowPos = 0;

      table.add(row);

      while(rowPos < branch.getColumns() && pos < children.length) {

        String path  = getPath(branch, children[pos]);

        String title = children[pos].getName();

        int[]  size;

        if(children[pos].isDirectory()) {

          size  = branch.getThumbnailer().getDirSize(children[pos]);

        }

        else {

          size  = branch.getThumbnailer().getSmallSize(children[pos]);

          title = FileUtils.extractFileName(title);

        }

        IndexEntry entry = new IndexEntry(children[pos],

          URLEncoder.encode(path, URL_ENCODING),

          title, children[pos].isDirectory(), size[0], size[1]);

        MetaInfoItem meta = findMetaInfo(branch, branch.getImagesRoot(), children[pos]);

        if(meta != null) {

          if(meta.getTitle() != null) {

            entry.setTitle(meta.getTitle());

          }

          if(meta.getSubtitle() != null) {

            entry.setSubtitle(meta.getSubtitle());

            entry.setSubtitleMime(meta.getSubtitleMime());

          }

          if(meta.getComment() != null) {

            entry.setComment(meta.getComment());

            entry.setCommentMime(meta.getCommentMime());

          }

        }

        row.add(entry);

        rowPos++;

        pos++;

      }

      while(rowPos < branch.getColumns()) {

        row.add(null);

        rowPos++;

      }

    }

    return true;

  }

  protected String getPath(Branch branch, File file)

    throws IOException

  {

    String path     = file.getCanonicalPath();

    String rootPath = branch.getImagesRoot().getCanonicalPath();

    if(path.equals(rootPath)) return "";

    if(!rootPath.endsWith(File.separator)) rootPath += File.separator;

    if(!path.startsWith(rootPath))

      return null;

    return path.substring(rootPath.length());

  }

  protected static final Logic instance = new Logic();

  public static Logic getLogic()

  {

    return instance;

  }

  /**

   * checks if given file is really under the parent directory

   */

  protected void securePath(File parentDir, File file)

    throws IOException, LogicException

  {

    if(parentDir == null || file == null) return;

    File partFile = file.getCanonicalFile();

    parentDir = parentDir.getCanonicalFile();

    while(partFile != null) {

      if(partFile.equals(parentDir)) return;

      partFile = partFile.getParentFile();

    }

    throw new LogicSecurityException(

      "[" + file.getCanonicalPath() + "] is outside of directory ["

      + parentDir.getCanonicalPath() + "]");

  }

}