Postman:使用SHA256和RSA的自定义签名请求
我编写了一个接口，用python向内部audible api发出请求。每个API请求都需要使用RSA SHA256签名。
现在，我想用Postman测试API的端点，并使用pre request脚本函数。但是我对javascript并不是很坚定。也许有人能帮我把下面的python函数翻译成Postman脚本：
def sign_request(
request: httpx.Request, adp_token: str, private_key: str
) -> httpx.Request:
"""
Helper function who creates a signed requests for authentication.
:param request: The request to be signed
:param adp_token: the token is obtained after register as device
:param private_key: the rsa key obtained after register as device
:returns: The signed request
"""
method = request.method
path = request.url.path
query = request.url.query
body = request.content.decode("utf-8")
date = datetime.utcnow().isoformat("T") + "Z"
if query:
path += f"?{query}"
data = f"{method}\n{path}\n{date}\n{body}\n{adp_token}"
key = rsa.PrivateKey.load_pkcs1(private_key.encode())
cipher = rsa.pkcs1.sign(data.encode(), key, "SHA-256")
signed_encoded = base64.b64encode(cipher)
signed_header = {
"x-adp-token": adp_token,
"x-adp-alg": "SHA256withRSA:1.0",
"x-adp-signature": f"{signed_encoded.decode()}:{date}"
}
request.headers.update(signed_header)
return request我发现了如何获取请求方法和正文。我可以使用pm.request.url.getPathWithQuery()获取路径和查询。为了将头部添加到请求中，我使用了pm.request.headers.add。
但我不知道如何获得等格式的日期时间，连接字符串和签名的数据。
回答 2
Stack Overflow用户
发布于 2020-11-01 00:32:56
在Postman中实现这一点的问题是，您只能使用sandbox中提供的那些包。因此，您可以使用crypto-js作为加密操作的惟一包助手。
var CryptoJS = require("crypto-js");
var moment = require("moment");
signRequest(pm.request, "yourAdpToken", "yourPrivateKey")
function signRequest(request, adpToken, privateKey) {
const method = request.method;
const path = request.url.getPathWithQuery();
const body = request.body.raw;
const date = moment.utc().format();
const data = `${method}\n${path}\n${date}\n${body}\n${adpToken}`
const hash = CryptoJS.HmacSHA256(data, privateKey);
const signedEncoded = CryptoJS.enc.Base64.stringify(hash);
pm.request.headers.add({
key: 'x-adp-token',
value: adpToken
});
pm.request.headers.add({
key: 'x-adp-alg',
value: 'SHA256withRSA:1.0'
});
pm.request.headers.add({
key: 'x-adp-signature',
value: `${CryptoJS.enc.Base64.parse(signedEncoded)}:${date}`
});
}将上述代码添加到Pre-request脚本中会将您想要的标头添加到请求中，如下所示：
您可能需要更改编码部分，请检查encode options
Stack Overflow用户
发布于 2020-11-01 19:58:46
我要让它和pm lib一起运行。谢谢你的帮助。
唯一的问题是从env var获取包含换行符的私有证书，并使用这些代码sig.init(privateKey);给出错误。我必须在pre request脚本中直接编写私有证书字符串。
这是我的脚本。
eval( pm.globals.get('pmlib_code') );
var CryptoJS = require("crypto-js");
var moment = require("moment");
const adpToken = pm.environment.get("adp-token")
// private-key loaded from env var doesn't work because of newlines in it; bugfix
const privateKey = pm.environment.get("private-key")
// use private-key in pre request script directly make use of newline correctly
const privateKey2 = "-----BEGIN RSA PRIVATE KEY-----\nMIIE...==\n-----END RSA PRIVATE KEY-----\n"
signRequest(pm.request, adpToken, privateKey);
function signRequest(request, adpToken, privateKey2) {
const method = request.method;
const path = request.url.getPathWithQuery();
const body = request.body || "";
const date = moment.utc().format();
const data = `${method}\n${path}\n${date}\n${body}\n${adpToken}`;
var sig = new pmlib.rs.KJUR.crypto.Signature({"alg": "SHA256withRSA"});
sig.init(privateKey);
var hash = sig.signString(data);
const signedEncoded = CryptoJS.enc.Base64.stringify(CryptoJS.enc.Hex.parse(hash));
pm.request.headers.add({
key: 'x-adp-token',
value: adpToken
});
pm.request.headers.add({
key: 'x-adp-alg',
value: 'SHA256withRSA:1.0'
});
pm.request.headers.add({
key: 'x-adp-signature',
value: `${signedEncoded}:${date}`
});
}更新：
现在可以从env var读取设备证书了。我不得不用const privateKey = pm.environment.get("private-key").replace(/\\n/g, "\n")取代const privateKey = pm.environment.get("private-key")
https://stackoverflow.com/questions/64619771
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