团队作业（五）：项目冲刺3

各个成员今日完成的任务

范超明：继续完善前端代码
周意凯：继续加密解密代码修改
黄琪凯：继续完善后端代码
尤其羽：继续完善后端代码
杨语桐：代码测试

代码完成情况

前端新增部分代码

`def read_user_info(sm4_key):
directory = "user"
for user in os.listdir(directory):
decrypt_one_file(user, directory, sm4_key)
user = user[:-len(".encrypted")]
with open(os.path.join(directory, user), 'r') as user_info:
users[user] = user_info.read().strip()
encrypt_one_file(user, directory, sm4_key)

def write_user_info(sm4_key):
directory = "user"

for user, password in users.items():
    if user + ".encrypted" in os.listdir(directory):
        continue
    else:
        with open(os.path.join(directory, user), 'w') as user_info:
            user_info.write(password)
        encrypt_one_file(user, directory, sm4_key)`

后端新增部分代码

def add_user():
    user = input("input the username: ")
    if user in users:
        print("error, the user exists")
        return
    password = input("input the password: ")

    try:
        users[user] = password
    except:
        print("error when adding user, exit")
        return
    
    print("add the user: %s successfully" % user)

加密解密部分新增代码

`def decrypt_file(file_path, sm4_key):
# 执行解密操作
crypt_sm4 = sm4.CryptSM4()
crypt_sm4.set_key(sm4_key, sm4.SM4_DECRYPT)

try :
    # print(file_path)
    with open(file_path, 'rb') as encrypted_file:
        encrypted_data = encrypted_file.read()
except:
    print("an error occurred while opening the data, exit ")
    return

decrypted_data = crypt_sm4.crypt_ecb(encrypted_data)

# 保存解密后的文件（去除 .encrypted 后缀）
original_file_path = file_path.rsplit('.encrypted', 1)[0]
with open(original_file_path, 'wb') as file:
    file.write(decrypted_data)

# 删除加密文件（可选）
os.remove(file_path)

# print("decrypt the file successfully")`