Identity signal

In the process of gathering a latent set of time-constrained signals from existing OAUth identity services a given user might bring from either SaaS (e.g. LinkedIn, Twitter, ...) or sovereignly operated (e.g. Authentik, self-hosted) GitLab -- for a universal interface of OAuth idP authn / authz.

# Specifically, adapt this codebase
extern crate reqwest;
extern crate serde_json;
 
use serde_json::{Value};
 
// Function to retrieve DID from OAuth provider
async fn get_did(access_token: &str) -> Result<String, reqwest::Error> {
    let client = reqwest::Client::new();
    let api_url = format!("https://oauthprovider.com/api/did?access_token={}", access_token);
 
    let response = client.get(&api_url).send().await?;
    let did: String = response.json().await?;
 
    Ok(did)
}
 
// Function to sign VC using issuer's private key
fn sign_vc(vc: &str, private_key: &str) -> String {
    // Implementation to sign VC using private key goes here
    // ...
 
    let signed_vc = "signed VC".to_string();
    signed_vc
}
 
// Main function to sign Verifiable Credential
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let access_token = "OAuth access token";
    let did = get_did(access_token).await?;
    let vc = "Verifiable Credential";
    let private_key = "Private key associated with issuer's DID";
 
    let signed_vc = sign_vc(vc, private_key);
 
    println!("Signed VC: {}", signed_vc);
    println!("Issuer's DID: {}", did);
 
    Ok(())
}