<?php
/**
 *
 * FusionCharts Exporter - 'SVG Conversion Resource' handles
 * FusionCharts (since XTT) Server Side Export feature that
 * helps FusionCharts JavaScript charts to get exported.
 *
 *
 *    @author FusionCharts
 *    @description FusionCharts Exporter (Server-Side - PHP)
 *    @version 0.0.0.1 [ 32 December 2012 ]
 *
 */
/**
 *  ChangeLog / Version History:
 *  ----------------------------
 *
 *
 *  1.0.0.0 [ 31 December 2012 ]
 *
 *
 *	FEATURES:
 *       - Integrated with new Export feature of FusionCharts XT & FusionCharts Exporter v 2.0
 *       - can save to server side directory
 *       - can provide download or open in browser window/frame other than _self
 *
 *	ISSUES:
 *
 *
 *
 *
 *
 */
/**
 * Copyright (c) 2012 Infosoft Global Private Limited
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
/**
 *  GENERAL NOTES
 *  -------------
 *
 *  Chart would POST export data (which consists of encoded image data stream,
 *  width, height, background color and various other export parameters like
 *  exportFormat, exportFileName, exportAction, exportTargetWindow) to this script.
 *
 *  The script would process this data using appropriate resource files build
 *  export binary (PDF/image)
 *
 *  It either saves the binary as file to a server side directory or push it as
 *  Download or open in a new browser window/frame.
 *
 *
 */
/**
 *   @requires	index.php  A file that includes this resource
 *              Java 1.3+ & Apache Batik rasterizer class: Export JavaScript charts
 *              (http://xmlgraphics.apache.org/batik/)
 *
 *
 *   Details
 *   -------
 *
 *   The resource files would have these things as common:
 *
 *   	a) a constant - MIMETYPES that would have a string
 *         containing semicolon separated key value pairs.
 *		   Each key can be a format name specified in the
 *		   HANDLERASSOCIATIONS constant. The associated value
 *		   would be the mimetype for the specified format.
 *
 *		   e.g. define("MIMETYPES","jpg=image/jpeg;jpeg=image/jpeg;png=image/png;gif=image/gif");
 *
 *
 *		b) a constant - EXTENSIONS that again contain a string of
 *		   semicolon separated key value pair. Each key would again be the
 *		   format name and the extension would be the file extension.
 *
 *		   e.g. define("EXTENSIONS","jpg=jpg;jpeg=jpg;png=png;gif=gif");
 *
 *
 *      c) a function  - exportProcessor ( $stream , $meta )
 *		   It would take the FusionCharts exncoded image string as $stream &
 *		   an associative array $meta containging width, height and bgColor keys.
 *
 *         The function would return an object of mixed type which would contain
 *		   the processed binary/relevant export object.
 *
 *
 *		d) a function - exportOutput ( $exportObj, $exportSettings, $quality=1 )
 *         It would take the processed export object and other export setting as parameter.
 *         Moreover, it would take an optional parameter - $quality (in scale of 0 to 1).
 *         By Default, the $quality is passed as 1 (best quality)
 *
 *		   The function would return the file path on success or return false on failure.
 *
 *      [ The other code in the resource file can be anything that support this architecture ]
 *
 */

// =============================================================================
// ==                  Constants and  Variables                               ==
// =============================================================================
// ==============================================================================
//   Users are recommended NOT to perform any editing beyond this point.       ==
// ==============================================================================

ini_set('magic_quotes_gpc', 'off');

/* ------------------------- EXPORT RESOURCES -------------------------------- */

// This constant lists the mime types related to each export format this resource handles
// The value is semicolon separated key value pair for each format
// Each key is the format and value is the mime type
define( "MIMETYPES", "jpg=image/jpeg;jpeg=image/jpeg;gif=image/gif;png=image/png;pdf=application/pdf;svg=image/svg+xml" );
// This constant lists all the file extensions for the export formats
// The value is semicolon separated key value pair for each format
// Each key is the format and value is the file extension
define( "EXTENSIONS", "jpg=jpg;jpeg=jpg;gif=gif;png=png;pdf=pdf;svg=svg" );

define ('TEMP_PATH', 'batik/temp/');
define ('BATIK_PATH', 'batik/batik-rasterizer.jar');

// =============================================================================
// ==                             Public Functions                            ==
// =============================================================================

/**
 *  Gets Export data from FCExporter - main module and build the export binary/objct.
 *  @param	$stream 	(string) export image data in FusionCharts compressed format
 *      	$meta		{array)	Image meta data in keys "width", "heigth" and "bgColor"
 *              $exportParams   {array} Export related parameters
 *  @return 			image object/binary
 */
function exportProcessor( $stream , $meta, $exportParams )
{

      	// get mime type list parsing MIMETYPES constant declared in Export Resource PHP file
	$ext = strtolower($exportParams["exportformat"]);
	$mimeList = bang( @MIMETYPES );
        $mimeType = $mimeList[$ext];

        // prepare variables
	if (get_magic_quotes_gpc()) {
		$stream = stripslashes($stream);
	}

	// create a new export data
	$tempFileName = md5(rand());

	$tempOutputFile = TEMP_PATH."$tempFileName.$ext";
        $tempInputSVGFile = TEMP_PATH."$tempFileName.svg";

	if ($ext != 'svg') {

            // width format for batik
            $width = @$meta['width'];
            if ($width) {
		$width = "-w $width";
            }

            //batik bg color format
            $bg = @$meta['bgColor'];
            if ($bg) {
		$bg = "-bg 255." . hex2rgb($bg, ".");
            }

            // generate the temporary file
            if (!file_put_contents( $tempInputSVGFile, $stream )) {
		die("Couldn't create temporary file. Check that the directory permissions for
			the ".TEMP_PATH." directory are set to 777.");
            }

            // do the conversion
            $command = "java -jar ". BATIK_PATH ." -m $mimeType $width $bg $tempInputSVGFile";
            $output = shell_exec( $command );

            // catch error
            if (!is_file($tempOutputFile) || filesize($tempOutputFile) < 10) {
		$return_binary = "$output";
                raise_error($output, true);
            }
            // stream it
            else {
		$return_binary =  file_get_contents($tempOutputFile);
            }

            // delete temp files
            if (file_exists($tempInputSVGFile)) {
                unlink($tempInputSVGFile);
            }
            if (file_exists($tempOutputFile)) {
                unlink($tempOutputFile);
            }


    // SVG can be streamed back directly
    } else if ($ext == 'svg') {
	$return_binary =  $stream;

    } else {
	raise_error("Invalid Export Format.", true);
    }
    // return export ready binary data
    return @$return_binary;

}

/**
 *  exports (save/download) SVG to export formats.
 *  @param	$exportObj 		(mixed) binary/objct exported by exportProcessor
 *	@param	$exportSettings	(array) various server-side export settings stored in keys like
 *					"type", "ready" "filepath" etc. Required for 'save' expotAction.
 *					For 'download' action "filepath" is blank (this is checked to find
 *					whether the action is "download" or not.
 *	@param	$quality		(integer) quality factor 0-1 (1 being the best quality). As of now we always pass 1.
 *
 *  @return 				false is fails. {filepath} if succeeds. Only returned when action is 'save'.
 */
function exportOutput ( $exportObj, $exportSettings, $quality = 1 )
{

	// calls svgparser function that saves/downloads binary
	// store saving status in $doneExport which receives false if fails and true on success
	$doneExport = filesaver ( $exportObj, @$exportSettings ['filepath'] );

	// check $doneExport and if true sets status to {filepath}'s value
	// set false if fails
	$status =( $doneExport ? basename ( @$exportSettings ['filepath'] ) : false );

	// return status
	return $status;

}

/**
 *  emulates imagepng/imagegif/imagejpeg. It saves data to server
 *  @param	$exportObj 	(resource) binary exported by exportProcessor
 *  @param	$filepath	(string) Path where the exported is to be stored
 *                              when the action is "download" it is null.
 *
 *  @return     (boolean) false is fails. true if succeeds. Only returned when action is 'save'.
 */
function filesaver ( $exportObject , $filepath )
{

	// when filepath is null the action is 'download'
	// hence write the  bimary to response stream and immediately terminate/close/end stream
	// to prevent any garbage that might get into response and corrupt the  binary
	if ( !@$filepath ) die ( $exportObject );

	// open file path in write mode
	$fp = @fopen ( $filepath , "w" );

	if( $fp )
	{
		// write  binary
		$status = @fwrite( $fp , $exportObject );
		//close file
		$fc = @fclose( $fp );
	}

	// return status
	return ( bool ) @$status;

}

/**
 * Converts Hex color values to rgb
 *
 * @param string $h Hex values
 * @param string $sep rgb value separator
 * @return string
 */
function hex2rgb($h, $sep = "") {
    $h = str_replace("#", "", $h);

    if(strlen($h) == 3) {
        $r = hexdec(substr($h,0,1).substr($h,0,1));
        $g = hexdec(substr($h,1,1).substr($h,1,1));
        $b = hexdec(substr($h,2,1).substr($h,2,1));
    }
    else {
        $r = hexdec(substr($h,0,2));
        $g = hexdec(substr($h,2,2));
        $b = hexdec(substr($h,4,2));
    }
    $rgb = array($r, $g, $b);
    if($sep) {
        $rgb = implode($sep, $rgb);
    }
    return $rgb;
}

return 'true';
?>