dl/lib/ocdn-legacy/OcdnTransformation.js

DreamLab Libs

var Core = require("core"),
    Class = Core.Class,
    crypto = Core.crypto;

var OcdnTransformation = function () {};

OcdnTransformation = new Class(new OcdnTransformation());

OcdnTransformation.crypt = function (key, name, transStr) {
    transStr = transStr || OcdnTransformation.Transformation.ORIGINAL;
    var checksum = crypto.md5(name + transStr + key);
    var buff = new Buffer(checksum.substr(0,2) + ';' + transStr );
    var base = buff.toString('base64');
    return base.replace(/=/g, '_');
};

OcdnTransformation.decrypt = function (key, name, transStr) {
    var transformations = new Buffer(transStr.replace(/_/g, '='), 'base64').toString();
    var checksum = transformations.substr(0,2);
    transformations = transformations.substr(3);
    return transformations;
};


OcdnTransformation.encodeTransformations = function (transformations) {
    var trans = null;
    if (transformations.length === 0) {
        trans = OcdnTransformation.Transformation.ORIGINAL;
    } else {
        trans = "";
        for (var i = 0, iMax = transformations.length; i < iMax; i++) {
            trans += transformations[i].transformation;
            for (var j = 0, jMax = transformations[i].params.length; j < jMax; j++) {
                trans += ',' + transformations[i].params[j].toString(16);
            }
            trans += ";";
        }
        trans = trans.slice(0, -1);  //remove last comma
    }
    return trans;
};

OcdnTransformation.decodeTransformations = function (transformations) {

    var retVal = [];
    transformations = transformations.split(';');

    for (var i = 0, iMax = transformations.length; i < iMax; i++) {
        var trans = transformations[i].split(',');
        retVal.push({
            transformation:  trans.shift(),
            params: trans
        });
    }

    if (retVal.length == 1 &&
        retVal[0].transformation == OcdnTransformation.Transformation.ORIGINAL){
        retVal = [];
    }

    return retVal;
};


OcdnTransformation.Transformation = {};
OcdnTransformation.Transformation.ORIGINAL = '00';
OcdnTransformation.Transformation.ROTATE = '01';
OcdnTransformation.Transformation.BLUR = '02';
OcdnTransformation.Transformation.RESIZE = '03';
OcdnTransformation.Transformation.CROP = '04';
OcdnTransformation.Transformation.GRAYSCALE = '05';
OcdnTransformation.Transformation.BOUNDING_BOX = '06';
OcdnTransformation.Transformation.SAVEAS = '07';
OcdnTransformation.Transformation.QUALITY_PRESET = '08';
OcdnTransformation.Transformation.IMAGEFORMAT = '09';
OcdnTransformation.Transformation.SETBACKGROUND = '0a';
OcdnTransformation.Transformation.PRESERVEANIMATION = '0b'; // Obsolete
OcdnTransformation.Transformation.COMBINE = '0c';
OcdnTransformation.Transformation.DISABLEANIMATION = '0d';

exports.OcdnTransformation = OcdnTransformation;