如何用Python AlgoSDK恢复Algorand钱包？

Question

虽然官方的algosdk (Python SDK for Algorand)文档建议，只需调用以下函数(link)即可恢复钱包：

create_wallet(name, pswd, driver_name='sqlite', master_deriv_key=None)

第四个参数：

master_deriv_key (str, optional) – if recovering a wallet, include

钱包恢复在我的代码中不起作用，也会导致遇到异常。此外，官方Algorand文档还展示了如何使用上述函数恢复钱包(link)：

# recover the wallet by passing mdk when creating a wallet
new_wallet = kcl.create_wallet("MyTestWallet2", "testpassword", master_deriv_key=mdk)

下面，您可以查看我的代码，这是一个非常简单的代码片段，我用Algorand SDK进行了一些测试：

from algosdk import kmd
from algosdk import mnemonic

kmd_clt = kmd.KMDClient('855d39510cce40caf11de4c941b37632d1529ec970156214528a33a0ae8473b4', 'http://127.0.0.1:6969')
if kmd_clt:
    kmd_wlt_mdk = None
    kmd_wlt_list = kmd_clt.list_wallets()
    for kmd_wlt in kmd_wlt_list:
        kmd_name = kmd_wlt['name']
        kmd_id = kmd_wlt['id']
        if kmd_name == 'wallet_name':
            kmd_wlt_hdl = kmd_clt.init_wallet_handle(kmd_id, 'wallet_password')
            if kmd_wlt_hdl:
                kmd_wlt_mdk = kmd_clt.export_master_derivation_key(kmd_wlt_hdl, 'wallet_password')
            break
    if kmd_wlt_mdk:
        kmd_wlt = kmd_clt.create_wallet('wallet_name', 'wallet_password', master_deriv_key=kmd_wlt_mdk)
        kmd_wlt_hdl = kmd_clt.init_wallet_handle(kmd_wlt['id'], 'wallet_password')
        acc_addr_list = kmd_clt.list_keys(kmd_wlt_hdl)
        for acc_addr in acc_addr_list:
            account_address = acc_addr
            print(account_address)
            account_key = kmd_clt.export_key(kmd_wlt_hdl, 'wallet_password', account_address)
            print(account_key)
            account_mnemonic = mnemonic.from_private_key(account_key)
            print(account_mnemonic)

下面，您可以查看在运行时返回的回溯和错误消息：

Traceback (most recent call last):
  File "/home/emiliano/anaconda3/lib/python3.7/site-packages/algosdk/kmd.py", line 63, in kmd_request
    resp = urlopen(req)
  File "/home/emiliano/anaconda3/lib/python3.7/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/home/emiliano/anaconda3/lib/python3.7/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/home/emiliano/anaconda3/lib/python3.7/urllib/request.py", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/home/emiliano/anaconda3/lib/python3.7/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/home/emiliano/anaconda3/lib/python3.7/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/home/emiliano/anaconda3/lib/python3.7/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 400: Bad Request

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/emiliano/anaconda3/lib/python3.7/site-packages/algosdk/kmd.py", line 67, in kmd_request
    raise error.KMDHTTPError(json.loads(e)["message"])
algosdk.error.KMDHTTPError: wallet with same name already exists

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "algorand_test.py", line 49, in <module>
    kmd_wlt = kmd_clt.create_wallet('emiliano', 'emiliano', master_deriv_key=kmd_wlt_mdk)
  File "/home/emiliano/anaconda3/lib/python3.7/site-packages/algosdk/kmd.py", line 118, in create_wallet
    return self.kmd_request("POST", req, data=query)["wallet"]
  File "/home/emiliano/anaconda3/lib/python3.7/site-packages/algosdk/kmd.py", line 69, in kmd_request
    raise error.KMDHTTPError(e)
algosdk.error.KMDHTTPError: {
  "error": true,
  "message": "wallet with same name already exists"
}

似乎很清楚，create_wallet函数是这种行为的罪魁祸首，它会导致返回错误"wallet同名已存在“。Algorand SDK的内部非常简单，API是REST方法的包装器。Function create_wallet的作用很简单(link)：

def create_wallet(self, name, pswd, driver_name="sqlite",
                  master_deriv_key=None):
    """
    Create a new wallet.
    Args:
        name (str): wallet name
        pswd (str): wallet password
        driver_name (str, optional): name of the driver
        master_deriv_key (str, optional): if recovering a wallet, include
    Returns:
        dict: dictionary containing wallet information
    """
    req = "/wallet"
    query = {
        "wallet_driver_name": driver_name,
        "wallet_name": name,
        "wallet_password": pswd
    }
    if master_deriv_key:
        query["master_derivation_key"] = master_deriv_key
    return self.kmd_request("POST", req, data=query)["wallet"]

我确信传入输入的主导出密钥是正确的，因为我已经在控制台使用goal命令检查过它。

以前有没有其他人遇到过这种类型的问题？

Answer 1

总而言之，REST API的算法和文档并没有明确建议在创建POST /v1/wallet (link)时使用主导出密钥来检索钱包。相反，Python SDK的算法和文档建议可以将主导出密钥传递给create_wallet函数，然后该函数生成前面声明的HTTP POST，以恢复现有的钱包(link)。

正如我在上面的问题中所解释的那样，由于底层POST /v1/wallet出现故障，create_wallet无法恢复钱包。在@Arty的建议下，这已经被证明如下：

curl -X POST -H "X-KMD-API-Token: <kmd-token>" -H "Content-Type: application/json" -d '{"wallet_driver_name": "sqlite", "wallet_name": <wallet-name>, "wallet_password": <wallet-password>, "master_derivation_key": <master-derivation-key>}' <kmd-address-and-port>/v1/wallet

返回的

{ "error": true, "message": "wallet with same name already exists" }

我已经将这个问题通知了Algorand支持部门，目前正在等待回复。总之，为了让问题的标题更有意义，我想分享另一种可能的解决方案，即仍然依靠Python SDK来恢复钱包：

from algosdk import kmd
from algosdk import wallet
from algosdk import mnemonic

kmd_clt = kmd.KMDClient(<kmd-token>, <kmd-address-and-port>)
if kmd_clt:
    kmd_wlt_mdk = None
    kmd_wlt_list = kmd_clt.list_wallets()
    for kmd_wlt in kmd_wlt_list:
        kmd_name = kmd_wlt['name']
        kmd_id = kmd_wlt['id']
        if kmd_name == <wallet-name>:
            kmd_wlt_hdl = kmd_clt.init_wallet_handle(kmd_id, <wallet-password>)
            if kmd_wlt_hdl:
                kmd_wlt_mdk = kmd_clt.export_master_derivation_key(kmd_wlt_hdl, <wallet-password>)
            break
    if kmd_wlt_mdk:
        wlt = wallet.Wallet(<wallet-name>, <wallet-password>, kmd_clt, mdk=kmd_wlt_mdk)
        if wlt:
            acc_addr_list = wlt.list_keys()
            for acc_addr in acc_addr_list:
                account_address = acc_addr
                print(account_address)
                account_key = wlt.export_key(acc_addr)
                print(account_key)
                account_mnemonic = mnemonic.from_private_key(account_key)
                print(account_mnemonic)

我希望它能在将来对其他人有用。