crack_geetest

crack_geetest.js

            function load_geetest_img(slices){
                return new Promise((resolve, reject)=>{
                    var img = new Image();
                    img.crossOrigin = "Anonymous";
                    img.onload = ()=>{resolve(img)};
                    img.src = slices[0].style.backgroundImage.slice(4, -1);
                });
            }

            var restore_image = function(img, slices){
                // 在canvas中画出图片
                var canvas = document.createElement("canvas");
                // canvas.setAttribute("id", "crack_geetest");
                var context = canvas.getContext('2d');
                var upper_offset = 0;
                var down_offset = 0;
                for(var background_image of slices){
                    var x = Math.abs(parseInt(background_image.style.backgroundPositionX.slice(0,-2)));
                    var y = parseInt(background_image.style.backgroundPositionY.slice(0,-2));
                    if(y == -58){
                        // 上部分 Image
                        context.drawImage(img, x, 58, 10, 58, upper_offset, 0, 10, 58);
                        upper_offset += 10;
                    }else{
                        // 下部分 Image
                        context.drawImage(img, x, 0, 10, 58, down_offset, 58, 10, 58);
                        down_offset += 10;
                    }
                }
                return canvas;
            }


            var take_background_image = function(){
                var slices1 = document.querySelectorAll(".gt_cut_bg_slice");//缺一块的
                var slices2 = document.querySelectorAll(".gt_cut_fullbg_slice");//完整的
                return Promise.all([
                    load_geetest_img(slices1),
                    load_geetest_img(slices2)
                ])
                .then((imgs)=>{
                    return [restore_image(imgs[0], slices1), restore_image(imgs[1], slices2)]
                });
            }
            

            var is_similar = function(img1, img2, w, h){
                var pixel1 = img1.getContext('2d').getImageData(w, h, 1, 1).data;
                var pixel2 = img2.getContext('2d').getImageData(w, h, 1, 1).data;
                for (var i=0;i < 3; i++){
                    if (Math.abs(pixel1[i] - pixel2[i]) >= 50){
                        return false;
                    }
                }
                return true;
            }

            var loc_diff = function(img1, img2){
                console.log(`loc_diff: ${img1.width}, ${img1.height}`);
                for(var i = 0; i < img1.width; i++){
                    for(var j = 0; j < img1.height; j++){
                        if(!is_similar(img1, img2, i, j)){
                            return i;
                        }
                    }
                }
                return null;
            }

            var get_track = function(offset){
                var ret = [];
                var x = Math.floor(Math.random()*2)+1;
                var off = 0;
                var y_off = 0;
                while(offset - x >= 5){
                    off += x;
                    ret.push([off]);
                    offset -= x;
                    x = Math.floor(Math.random()*2)+1;
                }
                for(var i = 0; i < offset;){
                    off += 1;
                    i += 1;
                    ret.push([off]);
                }
                // 生成轨迹的y坐标
                var size1 = Math.floor(ret.length/5);
                var size2 = Math.floor(ret.length*4/5);

                for(var i = 0; i < ret.length; i++){
                    if (i < size1){
                        ret[i].push(0);
                        var rand = (Math.random()*15+5);
                    }else if(i < size2){
                        ret[i].push(-1);
                        var rand = (Math.random()*5+5);
                    }else{
                        ret[i].push(0);
                        var rand = (Math.random()*15+5);
                    }
                    ret[i].push(rand);
                }
                return ret;
            }

            var get_start_position = function(){
                var knob = document.querySelector(".gt_slider_knob");
                var rect = knob.getBoundingClientRect();
                return [Math.floor(rect.left + rect.width/2), Math.floor(rect.top + rect.height/2)];
            }

            window.crack_finished = false;
            function crack_events(){
                return take_background_image().then((canvases)=>{
                    var [img1, img2] = canvases;
                    var offset = loc_diff(img1, img2);
                    var track = get_track(offset - 5);  
                    console.log("track", track);
                    var position = get_start_position();
                    var mousedown = ["mousedown", position[0], position[1], 0.5];
                    var mousemove = track.map((e)=>{return ["mousemove", position[0] + e[0], position[1] + e[1], e[2]]});
                    var mouseup = ["mouseup", position[0] + track[track.length-1][0], position[1]+ track[track.length-1][1], 0.5];
                    mousemove.unshift(mousedown);
                    mousemove.push(mouseup);
                    return mousemove;
                });
            }

            function mouse_event(type, x, y){
                console.log(`trigger ${type} on ${x}, ${y}`)
                var knob = document.querySelector(".gt_slider_knob")
                var event = document.createEvent('MouseEvent');
                event.initMouseEvent(type, true, false, window, 0, 0, 0, x, y/*坐标*/,false, false, false, false, 0, null);
                knob.dispatchEvent(event);
            }

            function dispatch_events(events){
                if (events.length === 0){
                    window.crack_finished = true;
                    return null;
                }
                var [type, x, y, rand] = events.shift();
                console.log(`${(new Date()).getTime()}: ${x}, ${y}, ${rand}`);
                mouse_event(type, x, y);
                let promise = new Promise((resolve, reject)=>{
                    setTimeout(
                        ()=>{
                            resolve(events)
                        }, rand
                    );
                });
                promise.then((events)=>{
                    dispatch_events(events)
                });
                return promise;
            }
            crack_events().then((events)=>{
                console.log("events", events);
                return dispatch_events(events);
            }).catch((e)=>{console.log("Exception", e)});