api.php

<?php
// Enable buffering
ob_start();

include_once("classes_php/Scanimage.php");
include_once("classes_php/ScanRequest.php");
include_once("classes_php/ScannerOptions.php");
include_once("classes_php/FileInfo.php");

// Write ajax header
//Content-Type: application/json; charset=utf-8

header('Content-Type: application/json');
//date_default_timezone_set('Europe/London');

class Api {
	public static function HandleCmdlineRequest($request) {
		$cmd = $request->data;
		System::Execute($cmd, $output, $ret);
		return array("cmd" => $cmd, "output" => $output, "ret" => $ret);
	}

	public static function HandlePreviewRequest($request) {
		$wait=' -size 423x584 -fill white -background "#3C98E4" -pointsize 30 -gravity North label:"\nPlease wait..." ';
		$cmd = Config::Convert.' '.$wait.' '.Config::PreviewDirectory.'preview.jpg';
		System::Execute($cmd, $output, $ret);
        
		$clientRequest = $request->data;
		
        $scanRequest = new ScanRequest();
        
        if (isset($clientRequest->mode)) $scanRequest->options["mode"] = $clientRequest->mode;
		if (isset($clientRequest->brightness)) $scanRequest->options["brightness"] = (int)$clientRequest->brightness;
		if (isset($clientRequest->contrast)) $scanRequest->options["contrast"] = (int)$clientRequest->contrast;
		if (isset($clientRequest->source)) $scanRequest->options["source"] = $clientRequest->source;
        
        if (isset($clientRequest->format)) {
            $scanRequest->format = $clientRequest->format;
        } else {
            $scanRequest->format = Config::OutputExtension;
        }
        
        if (isset($clientRequest->device)) {
            $scanRequest->device = $clientRequest->device;
            $scanner = ScannerOptions::get($scanRequest->device);
            $scannerOptions = $scanner["options"];
            $scanRequest->options["resolution"] = array_key_exists("resolution",$scannerOptions) ? $scannerOptions["resolution"]->values[0] : 0;
        }
        
		$scanRequest->outputFilepath = Config::PreviewDirectory."preview.tif";
		$scanner = new Scanimage();
		$scanResponse = $scanner->Execute($scanRequest);	
		return $scanResponse;
	}

	public static function HandlePreviewToJpegRequest() {
		$cmd = Config::PreviewFilter.' '.Config::PreviewDirectory.'preview.jpg  <'.Config::PreviewDirectory.'preview.tif';
		System::Execute($cmd, $output, $ret);
		$jpg=file_get_contents(Config::PreviewDirectory.'preview.jpg');
		return array("cmd" => $cmd, "output" => $output, "ret" => $ret, "jpg" => base64_encode($jpg) );
	}

	public static function HandleScanRequest($request) {
        $clientRequest = $request->data;

		$scanRequest = new ScanRequest();
        
        if (isset($clientRequest->resolution)) $scanRequest->options["resolution"] = (int)$clientRequest->resolution;
		if (isset($clientRequest->mode)) $scanRequest->options["mode"] = $clientRequest->mode;
		if (isset($clientRequest->brightness)) $scanRequest->options["brightness"] = (int)$clientRequest->brightness;
		if (isset($clientRequest->contrast)) $scanRequest->options["contrast"] = (int)$clientRequest->contrast;
		if (isset($clientRequest->source)) $scanRequest->options["source"] = $clientRequest->source;
        if (isset($clientRequest->depth)) $scanRequest->options["depth"] = (int)$clientRequest->depth;
        if (isset($clientRequest->top)) $scanRequest->options["t"] = (int)$clientRequest->top;
        if (isset($clientRequest->left)) $scanRequest->options["l"] = (int)$clientRequest->left;
		if (isset($clientRequest->height)) $scanRequest->options["y"] = (int)$clientRequest->height;
		if (isset($clientRequest->width)) $scanRequest->options["x"] = (int)$clientRequest->width;
        
        if (isset($clientRequest->device)) 
            $scanRequest->device = $clientRequest->device;
            
        if (isset($clientRequest->format)) 
            $scanRequest->format = $clientRequest->format;
        else 
            $scanRequest->format = Config::OutputExtension;
        
        $outputfile = Config::OutputDirectory . "Scan_" . time() . "." . $scanRequest->format;
		$scanRequest->outputFilepath = $outputfile;
		$scanRequest->outputFilter = Config::OutputFilter;
		$scanner = new Scanimage();
		$scanResponse = $scanner->Execute($scanRequest);		
		return $scanResponse;
	}

    public static function HandleFormatListRequest() {
        if (!System::HasConvert()) return array(Format::OutputExtension);
        
        $formats = array(Format::BMP,
                         Format::JPG,
                         Format::PDF,
                         Format::PNG,
                         Format::TIFF);
        sort($formats);
        return $formats;
    }

    public static function HandleOptionListRequest() {
        return ScannerOptions::getAll();
    }

	public static function HandleFileListRequest() {
		$files = array();
		$outdir = Config::OutputDirectory;

		foreach (new DirectoryIterator($outdir) as $fileinfo) {
			if(!is_dir($outdir.$fileinfo) && preg_match('/^Scan_[0-9]*/',$fileinfo->getFilename())) {		
                $files[$fileinfo->getMTime()] = $fileinfo->getFilename();
			}
		}

		krsort($files);
		$dirArray = array_values($files);

		$files = array();

		foreach ($dirArray as $filepath) {
			array_push($files, new FileInfo($outdir.$filepath));
		}

		return $files;
	}

	public static function HandleFileDeleteRequest($request) {
		if (!isset($request->data)) return FALSE;
        $fileInfo = new FileInfo($request->data);
		return $fileInfo->Delete();
	}
    
    public static function HandleRefreshDevicesRequest() {
		$devices = System::ScannerDevices();
        file_put_contents(ScannerOptions::DEVICES_FILE, implode("\n", $devices));
        $options = System::ScannerOptions();
        file_put_contents(ScannerOptions::OPTIONS_FILE, implode("\n", $options));
        return true;
	}

	public static function Main() {
		if($_SERVER["REQUEST_METHOD"] == "POST") {
			$input = file_get_contents('php://input');
            $request = json_decode($input);

			$responseType = $request->type;
				
			switch ($request->type) {
				case "scan":
					$responseData = self::HandleScanRequest($request);
					break;

				case "preview":
					$responseData = self::HandlePreviewRequest($request);
					break;

				case "fileList":
					$responseData = self::HandleFileListRequest();
					break;

				case "fileDelete":
					$responseData = self::HandleFileDeleteRequest($request);
					break;

				case "previewToJpeg":
					$responseData = self::HandlePreviewToJpegRequest();
					break;

				case "cmdline":
					// $responseData = self::HandleCmdlineRequest($request);
					$responseData = "cmdline is disabled. If you wish to debug httpdusr permissions you will need to manually enable this in the source.";
					break;
                    
                case "getFormats":
                    $responseData = self::HandleFormatListRequest();
					break;
                    
                case "getOptions":
                    $responseData = self::HandleOptionListRequest();
					break;
                    
                case "refreshDevices":
					$responseData = self::HandleRefreshDevicesRequest();
					break;

				case "ping":
					$responseData = "Pong@".date("Y-m-d H.i.s",time());
					break;
					
				default:
					$responseType = "unknown";
					$responseData = null;
					break;
			};
		
			$response = array(
				"type" => $responseType,
				"data" => $responseData
			);

			echo json_encode($response);
		
		} else {
			echo "GET METHOD NOT SUPPORTED";
		}
	}
}

Api::Main();
?>