Android逆向之路---让我们试试另一种方法看漫画-(2)

前言

上次我们分析到了快看漫画的协议部分，这次我们根据他的协议来手动写个脚本，然后执行以后，可以把他的漫画自动下载到电脑上面，
然后自动拼接图片，这样就可以实现在电脑上当成一个长图来看漫画了，没有广告，没有app的一些限制，先上图，一起看看成果

本文分析基于：快看漫画5.2.0(52000)
事先说明，这是一个系列，关于快看漫画的系列，不过在今天写看漫画这个系列的时候，博主后面的工作也还没有做呢，也希望在大家的监督之下一点一点的全部完成吧。
ps:避免广告嫌疑，以下统称kk漫画了。

为什么选择这个app？
排名靠前啊，反正就选到了，
有对别的感兴趣的同学也欢迎投稿，博主会尽自己所能，给大家带来点好玩的。

觉得看好多地方比较突然的，可以先转到上一篇，然后再来看这篇文章。
传送门：Android逆向之路—让我们试试另一种方法看漫画-(1)

找到正确的协议

上次我们找到了了协议的大概位置，这次我们要针对整个请求的过程进行精准的分析。包括每个接口的作用。
首先把log清空，然后点击他的开始阅读，我抓到了以下log
我以漫画:《李泰和方小甜的平行世界》为例子

经过我的分析，先和大家说结果：
1,4主要就是请求漫画的接口了
3,6主要是请求了一些广告信息
7可以理解为上传一些打点数据
2主要是获取了一些评论回复信息
5可能是和一些社交相关的，这个是我猜的

首先根据Log信息，我们能发现这些接口的作用，当然了，博主还有另一种办法，我们根据这些接口信息，依次的去找源码

源码分析

先分析

https://api.kkmh.com/v2/comic/22535?is_preview=0

我在源码里面搜v2/comic/，为什么这么搜，因为真正有开发经验的人是知道的，后面的一般开发的时候会写成可变的参数，
前面的url一般也是，我们开发的时候会有测试服务器和正式服务器，前面的是会变的，
搜索结果如下：

.method public abstract getComicDetail(JI)Lretrofit2/Call;
    .param p1    # J
        .annotation runtime Lretrofit2/http/Path;
            value = "comic_id"
        .end annotation
    .end param
    .param p3    # I
        .annotation runtime Lretrofit2/http/Query;
            value = "is_preview"
        .end annotation
    .end param
    .annotation system Ldalvik/annotation/Signature;
        value = {
            "(JI)",
            "Lretrofit2/Call",
            "<",
            "Lcom/kuaikan/comic/rest/model/API/ComicDetailResponse;",
            ">;"
        }
    .end annotation

    .annotation runtime Lretrofit2/http/GET;
        value = "/v2/comic/{comic_id}"
    .end annotation
.end method
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怎么样，这个看着太费劲了，我还是手动转成java来看

@GET("/v2/comic/{comic_id}")
@Query("is_preview")
@Path("comic_id")
public abstract Call.retrofit2 getComicDetail();
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根据方法名字其实就已经可以猜的可以了，然后利用动态调试，我们可以在APIRestClient.smali里面调用的地方打好断点，
(具体的动态调试方法，以前也说过，不熟悉的同学可以去翻我以前的文章)

    const/4 v0, 0x1

    :goto_0
    invoke-interface {v1, p1, p2, v0}, Lcom/kuaikan/comic/rest/SignInterface;->getComicDetail(JI)Lretrofit2/Call;

    move-result-object v0

    invoke-interface {v0, p4}, Lretrofit2/Call;->enqueue(Lretrofit2/Callback;)V

    .line 202
    return-void
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然后我们能够看出来，这个主要就是利用retrofit框架，来进行网络请求。

开始分析协议

首先通过log，或者动态调试我们已经拿到他请求回来的json数据了

{"code":200,"data":{"comment_view_message":"吐槽神马的尽管来","can_view":true,"cover_image_url":"http://f2.kkmh.com/image/170310/hi585uspn.webp-w640","created_at":1467150603,"recommend":{"recommend_list":[{"male_vertical_image_url":"http://f2.kkmh.com/image/171213/rt79rf2bj.webp-w320.w","vertical_image_url":"http://f2.kkmh.com/image/171213/rt79rf2bj.webp-w320.w","recommend_tag":["奇幻","剧情"],"topic_id":544,"recommend_source":"AI推荐","title":"整容游戏"},{"male_vertical_image_url":"http://f2.kkmh.com/image/171212/rl5z4ftks.webp-w320.w","vertical_image_url":"http://f2.kkmh.com/image/171212/rl5z4ftks.webp-w320.w","recommend_tag":["都市"],"topic_id":782,"recommend_source":"AI推荐","title":"密会"},{"male_vertical_image_url":"http://f2.kkmh.com/image/161220/7tsm5zh6g.webp-w320.w","vertical_image_url":"http://f2.kkmh.com/image/161220/7tsm5zh6g.webp-w320.w","recommend_tag":["灵异"],"topic_id":786,"recommend_source":"AI推荐","title":"百怪夜谭"}],"title":"猜你喜欢"},"is_favourite":false,"title":"第1话 爱的供养","widgets":[],"recommend_count":0,"updated_at":1489143638,"selling_kk_currency":0,"zoomable":1,"push_flag":0,"previous_comic_id":null,"share":{"award":false,"activity_id":null,"show_draw_record":false,"title":""},"customized_share":[{"description":"短篇合集，讲述一场自来水污染导致人类出现的奇奇怪怪的疾病。细思极恐，高能慎入！看作者的脑洞能有多大！【授权/每周五更新 责编：拉面】","share_platform":4,"title":"好看哭！《李泰和方小甜的平行世界》这个漫画太优秀了！","picture":"http://f2.kkmh.com/image/170310/hi585uspn.webp-w640","url":"https://m.kuaikanmanhua.com/comics/22535"},{"description":"短篇合集，讲述一场自来水污染导致人类出现的奇奇怪怪的疾病。细思极恐，高能慎入！看作者的脑洞能有多大！【授权/每周五更新 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1

以上的这些是完整的json数据，我们当然只说重点了。
加载机制：
关于kk漫画的加载机制，假如你现在在看第2章的漫画，当你看到一半多的时候，他就会请求这个接口，提前把第3章漫画的图片的url地址都拿下来。
依此类推。
我们需要关注的是，他如何找到下一个漫画的id，然后又如何判断下一个漫画的标题等等。

我们可以通过在程序里打断点，动态调试，或者看静态源码，或者Log信息，最终发现返回的数据如下，
关于重点的一些信息，我做了标记

制作我们自己的脚本的思路

思路：我们首先请求第一章的id,我们现在的id是22535，根据刚刚的Log分析可知。
然后我们请求回来之后，把images里面的图片都保存到指定的文件夹，准备合并。
然后请求下一章节，继续，直到所有漫画都下载到本地。
合并每个文件夹里面的图片，最后这些长图就是我们想看的漫画了。

我用的python写的这个脚本，因为个人平时都是用java，有些地方写的不好，也欢迎大家指正

我的脚本

github地址
运行环境：
python3.6+
Pillow库，
具体的可以查看ReadME，也可以联系本人

运行方法：
python .\app.py ${id}

python .\app.py 22535
1

22535只是一个章节的id，

我就以《漫画A作为例子》
然后脚本就会自动的在当前文件夹下面生成两个文件夹
漫画A和漫画A-result

漫画A-result里面就是拼接好的漫画了
漫画A-是分批下载的一些临时文件

具体如图：

前面的就是我们下载的一些临时文件
后一张图就是我们做好的了

声明

本文只做技术研究，不做商用，如有同学做商用，恶意攻击服务器，等非法行为，本人概不负责

告一段落

好了好了，其实说到了这里，今天就说到这里吧，这次把一整本书的内容都提取出来了。
可以开开心心的在本地看漫画了。

我希望呢，自己写博客，能够认认真真的写出一点东西分享给大家，而不是网上抄来抄去。希望能做一个踏踏实实做技术的人吧，不敢求太多，能给大家带来点好玩的就挺好。

写在最后

有什么问题欢迎给博主指出。
包括python，程序分析方面的问题，等。

成品就不上传了，希望大家都能跑

忽然想到id获取的问题，其实有几个思路，
* sd卡的根目录创建/KuaiKan文件夹，然后里面创建了一个空的kkmh_debug文件。使kk漫画处于debug模式下，自己抓Log
* 博主可以去对app重新打包，然后加上一些个人的代码，二次打包发布出来
* 写个xposed插件供大家使用

具体的可以下回说，也可以大家自己来发挥想象力啦，有什么问题欢迎联系我

关于我

个人网站：MartinHan的小站

博客：hanhan12312的专栏

知乎：MartinHan01