WeChatMsg/app/util/image.py

import os

from app.person import MePC

# 图片字节头信息，
# [0][1]为jpg头信息，
# [2][3]为png头信息，
# [4][5]为gif头信息
pic_head = [0xff, 0xd8, 0x89, 0x50, 0x47, 0x49]
# 解密码
decode_code = 0


def get_code(dat_read):
    """
    自动判断文件类型，并获取dat文件解密码
    :param file_path: dat文件路径
    :return: 如果文件为jpg/png/gif格式，则返回解密码，否则返回-1
    """

    head_index = 0
    while head_index < len(pic_head):
        # 使用第一个头信息字节来计算加密码
        # 第二个字节来验证解密码是否正确
        code = dat_read[0] ^ pic_head[head_index]
        idf_code = dat_read[1] ^ code
        head_index = head_index + 1
        if idf_code == pic_head[head_index]:
            return head_index, code
        head_index = head_index + 1
    print("not jpg, png, gif")
    return -1, -1


def decode_dat(file_path, out_path):
    """
    解密文件，并生成图片
    :param file_path: dat文件路径
    :return: 无
    """
    if not os.path.exists(file_path):
        return None
    with open(file_path, 'rb') as file_in:
        data = file_in.read()
    file_type, decode_code = get_code(data[:2])

    if decode_code == -1:
        return

    filename = os.path.basename(file_path)
    if file_type == 1:
        pic_name = os.path.basename(file_path)[:-4] + ".jpg"
    elif file_type == 3:
        pic_name = filename[:-4] + ".png"
    elif file_type == 5:
        pic_name = filename[:-4] + ".gif"
    else:
        pic_name = filename[:-4] + ".jpg"
    file_outpath = os.path.join(out_path, pic_name)
    if os.path.exists(file_outpath):
        return file_outpath

    # 对数据进行异或加密/解密
    with open(file_outpath, 'wb') as file_out:
        file_out.write(bytes([byte ^ decode_code for byte in data]))
    print(file_path, '->', file_outpath)
    return file_outpath


def decode_dat_path(file_path, out_path):
    """
    解密文件，并生成图片
    :param file_path: dat文件路径
    :return: 无
    """
    if not os.path.exists(file_path):
        return None
    with open(file_path, 'rb') as file_in:
        data = file_in.read(2)
    file_type, decode_code = get_code(data)

    if decode_code == -1:
        return

    filename = os.path.basename(file_path)
    if file_type == 1:
        pic_name = os.path.basename(file_path)[:-4] + ".jpg"
    elif file_type == 3:
        pic_name = filename[:-4] + ".png"
    elif file_type == 5:
        pic_name = filename[:-4] + ".gif"
    else:
        pic_name = filename[:-4] + ".jpg"
    file_outpath = os.path.join(out_path, pic_name)
    return file_outpath


def find_datfile(dir_path, out_path):
    """
    获取dat文件目录下所有的文件
    :param dir_path: dat文件目录
    :return: 无
    """
    files_list = os.listdir(dir_path)
    for file_name in files_list:
        file_path = dir_path + "\\" + file_name
        decode_dat(file_path, out_path)


def get_image(path, base_path) -> str:
    if path:
        base_path = os.getcwd() + base_path
        output_path = decode_dat(os.path.join(MePC().wx_dir, path), base_path)
        relative_path = './image/' + os.path.basename(
            output_path) if output_path else 'https://www.bing.com/images/search?view=detailV2&ccid=Zww6woP3&id=CCC91337C740656E800E51247E928ACD3052FECF&thid=OIP.Zww6woP3Em49TdSG_lnggAHaEK&mediaurl=https%3a%2f%2fmeekcitizen.files.wordpress.com%2f2018%2f09%2f404.jpg%3fw%3d656&exph=360&expw=640&q=404&simid=608040792714530493&FORM=IRPRST&ck=151E7337A86F1B9C5C5DB08B15B90809&selectedIndex=21&itb=0'
        return relative_path
    else:
        return ':/icons/icons/404.png'


def get_image_path(path, base_path) -> str:
    if path:
        base_path = os.getcwd() + base_path
        output_path = decode_dat_path(os.path.join(MePC().wx_dir, path), base_path)
        relative_path = './image/' + os.path.basename(
            output_path) if output_path else 'https://www.bing.com/images/search?view=detailV2&ccid=Zww6woP3&id=CCC91337C740656E800E51247E928ACD3052FECF&thid=OIP.Zww6woP3Em49TdSG_lnggAHaEK&mediaurl=https%3a%2f%2fmeekcitizen.files.wordpress.com%2f2018%2f09%2f404.jpg%3fw%3d656&exph=360&expw=640&q=404&simid=608040792714530493&FORM=IRPRST&ck=151E7337A86F1B9C5C5DB08B15B90809&selectedIndex=21&itb=0'
        return relative_path
    else:
        return ':/icons/icons/404.png'


if __name__ == "__main__":
    path = "E:\86390\Documents\WeChat Files\wxid_27hqbq7vx5hf22\FileStorage\CustomEmotion\\71\\"
    outpath = "D:\\test"
    if not os.path.exists(outpath):
        os.mkdir(outpath)
    find_datfile(path, outpath)