public static IFileStore getSourcePath(IPath originalPath) {
    IFileStore rootInstanceDir = EFS.getLocalFileSystem().getStore(
            URI.create(Platform.getInstanceLocation().getURL().toString()));
    String userName = originalPath.segments()[0];
    String projectName = originalPath.segments()[1];
    IPath projectPath = originalPath.removeFirstSegments(2).makeAbsolute();
    IFileStore serverSettings = rootInstanceDir.getChild(".metadata/.plugins/org.eclipse.orion.server.core/.settings/");
    Properties workspaceProperties = readProperties(serverSettings.getChild("Workspaces.prefs"));
    Properties projectProperties = readProperties(serverSettings.getChild("Projects.prefs"));
    if (workspaceProperties != null && projectProperties != null)
        try {
            for (Iterator<JsonNode> it = ((ArrayNode) JsonHelper.parse(new StringReader((String) workspaceProperties.get(userName + "/Projects")))).iterator();it.hasNext();) {
                ObjectNode entry = (ObjectNode) it.next();
                String projectKey = entry.get("Id").getTextValue();
                if (projectName.equals(projectProperties.getProperty(projectKey + "/Name"))) {
                    String workspaceLocation = projectProperties.getProperty(projectKey + "/ContentLocation");
                    URI result = URI.create(workspaceLocation + projectPath);
                    return EFS.getLocalFileSystem().getStore(result);
                }
            }
        } catch (IOException e) {
            //
        }
    return null;
}

protected static Properties readProperties(IFileStore propertiesLocation) {
    try {
        Properties userPrefs = new Properties();
        userPrefs.load(new StringReader(FileUtils.readFileToString(propertiesLocation.toLocalFile(EFS.NONE, null))));
        return userPrefs;
    } catch (IOException e) {
        return null;
    } catch (CoreException e) {
        return null;
    }
}