https://github.com/gl-zkPass/zkpass-sdk/blob/main/rust/zkpass-demo/src/data_issuer.rs
use serde_json::Value;
use std::collections::HashMap;
use std::io::prelude::*;
use tracing::info;
use zkpass_client::core::KeysetEndpoint;
use zkpass_client::interface::{ZkPassClient, ZkPassUtility};
use crate::constants::ISSUER_PRIVKEY;
//
// Simulating the REST call to the Data Issuer
//
pub struct DataIssuer;
//
// Simulating the Data Issuer
//
impl DataIssuer {
//
// This function simulates the Data Issuer's get_user_data_token REST API
//
pub fn get_user_data_tokens(
&self,
zkvm: &str,
data_files: HashMap<String, String>,
) -> HashMap<String, String> {
//
// Data Issuer's integration points with the zkpass-client SDK library
//
//
// Step 1: Instantiate the zkpass_client object
//
let zkpass_client = ZkPassClient::new("", None, zkvm);
//
// Step 2: Call the zkpass_client.sign_data_to_jws_token.
// This is to digitally-sign the user data.
//
data_files
.iter()
.map(|(data_tag, data_file)| {
let data = self.read_user_data_token(data_file);
let data_token = self.sign_user_data_token(&zkpass_client, data);
(data_tag.clone(), data_token)
})
.collect()
}
fn sign_user_data_token(&self, zkpass_client: &ZkPassClient, data: Value) -> String {
let kid = String::from("k-1");
let jku = String::from(
"https://raw.githubusercontent.com/gl-zkPass/zkpass-sdk/main/docs/zkpass/sample-jwks/issuer-key.json"
);
let ep = KeysetEndpoint { jku, kid };
zkpass_client
.sign_data_to_jws_token(ISSUER_PRIVKEY, data, Some(ep))
.unwrap()
}
fn read_user_data_token(&self, data_file: &String) -> Value {
let mut data_content =
std::fs::File::open(data_file).expect("Cannot find the user data file");
let mut data = String::new();
data_content
.read_to_string(&mut data)
.expect("Should not have I/O errors");
info!("data={}", data);
let data: Value = serde_json::from_str(&data).unwrap();
data
}
}
