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AceQL HTTP is a framework of REST like http APIs that allow to access to remote SQL databases over http from any device that supports http. AceQL HTTP is provided with three client SDK: - The AceQL C# Client SDK allows to wrap the HTTP APIs using Microsoft SQL Server like calls in their code, just like they would for a local database. - The AceQL Java Client JDBC Driver allows to wrap the HTTP APIs using JDBC calls in their code, just like they would for a local database. - The AceQL Python Client SDK allows SQL calls to be encoded with standard unmodified DB-API 2.0 syntax

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/*
 * This file is part of AceQL HTTP.
 * AceQL HTTP: SQL Over HTTP
 * Copyright (C) 2020,  KawanSoft SAS
 * (http://www.kawansoft.com). All rights reserved.
 *
 * AceQL HTTP is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * AceQL HTTP is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301  USA
 *
 * Any modifications to this file must keep this entire header
 * intact.
 */
package org.kawanfw.sql.servlet;

import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.SQLException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.kawanfw.sql.api.server.DatabaseConfigurator;
import org.kawanfw.sql.servlet.sql.json_return.JsonErrorReturn;
import org.kawanfw.sql.servlet.sql.json_return.JsonOkReturn;
import org.kawanfw.sql.servlet.util.BlobUtil;

/**
 * @author Nicolas de Pomereu
 *
 */
public class BlobLengthGetter {

    private HttpServletRequest request;
    private HttpServletResponse response;
    private OutputStream out;
    private String username;
    private DatabaseConfigurator databaseConfigurator;


    public BlobLengthGetter(HttpServletRequest request, HttpServletResponse response, OutputStream out,
	    String username, DatabaseConfigurator databaseConfigurator) {
	super();
	this.request = request;
	this.response = response;
	this.out = out;
	this.username = username;
	this.databaseConfigurator = databaseConfigurator;
    }

    /**
     * @param request
     * @param response
     * @param username
     * @param databaseConfigurator
     * @throws IOException
     * @throws SQLException
     */
    public void getLength() throws IOException, SQLException {
	String blobId = request.getParameter(HttpParameter.BLOB_ID);
	long length = -1;

	File blobDirectory = databaseConfigurator.getBlobsDirectory(username);

	if (blobDirectory != null && !blobDirectory.exists()) {
	    blobDirectory.mkdirs();
	}

	if (blobDirectory == null || !blobDirectory.exists()) {
	    JsonErrorReturn errorReturn = new JsonErrorReturn(response, HttpServletResponse.SC_NOT_FOUND,
		    JsonErrorReturn.ERROR_ACEQL_ERROR,
		    JsonErrorReturn.BLOB_DIRECTORY_DOES_NOT_EXIST + blobDirectory.getName());
	    ServerSqlManager.writeLine(out, errorReturn.build());
	    return;
	}

	try {
	    length = BlobUtil.getBlobLength(blobId, blobDirectory);
	} catch (Exception e) {
	    JsonErrorReturn errorReturn = new JsonErrorReturn(response, HttpServletResponse.SC_NOT_FOUND,
		    JsonErrorReturn.ERROR_ACEQL_ERROR, JsonErrorReturn.INVALID_BLOB_ID_DOWNLOAD + blobId);
	    ServerSqlManager.writeLine(out, errorReturn.build());
	    return;
	}

	ServerSqlManager.writeLine(out, JsonOkReturn.build("length", length + ""));
    }

}