{
    "key1"=value1, //int
    "key2"="value2", //string
}

{"timestamp":1674197059220,nonce:13} //NOTE that nonce is Integer

//for example: /sims/{sim_id}/usage
{"sim_id":"892030318384848290"}

//for example: ?begin_from=2023-01&type=1
{"begin_from":"2023-01","type":1}

{"begin_from":"2023-01","category_type":"data","end_by":"2023-01","nonce":128,"period_type":2,"sim_id":"89852002021102915651","timestamp":"1674197059220"}

# Author:luoyang
from Crypto.PublicKey import RSA
from Crypto.Hash import SHA
from Crypto.Signature import PKCS1_v1_5 as Sig_pk
import base64
import os
import json

# 
def get_sign(data):
    """
        sign
    """
    path = os.path.dirname(os.path.abspath(__file__))
    doc = os.path.join(path, 'private.pem')
    with open(doc) as pk:
        key_data = pk.read()

    # private key
    rsakey = RSA.importKey(key_data)
    # sha
    print("data：", data)
    en_data = SHA.new(data.encode())
    # sign
    sig_pk = Sig_pk.new(rsakey)
    sign = sig_pk.sign(en_data)
    # base64
    result = base64.b64encode(sign)
    # result
    data = result.decode()
    print("decode-sign:", data)
    return data

# format
def format_data(data):
    return data.replace(' ','')

# 
if __name__ =='__main__':
    data ={
             "title":"4.0",
             "timestamp":"1493893971",
             "query_type":"imei",
             "value":"12345"
            }
    sx_data = json.dumps(data, sort_keys=True, ensure_ascii=False)
    fdata = format_data(sx_data)
    get_sign(fdata)

//TODO might not accomodate nested json object..!!
paramsString = JSON.stringify(params, Object.keys(params).sort());

console.log("sorted string to sign:", paramsString);

//get key
var rsa = require('jsrsasign');
var pem = privateKey;

try {
    var keyhex = rsa.pemtohex(pem, "RSA PRIVATE KEY");
    var rsakey = rsa.KEYUTIL.getKeyFromPlainPrivatePKCS8Hex(keyhex);
} catch (e) {
    console.log("key error:", e);
}

var sig = new rsa.KJUR.crypto.Signature({ "alg": "SHA1withRSA" });
sig.init(rsakey);
sig.updateString(paramsString);
try {
    var sign = sig.sign();
    sign = rsa.hextob64(sign);

    //token
    var token = "LF " + accessKeyId + "/" + sign;
    pm.environment.set("lfToken", token);

} catch (e) {
    console.log("sign error:", e);
}