Rust

Docusign Refresh OAuth2 Access Token

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Demonstrates how to refresh a Docusign OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example. Rust

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file 
// saved by this example: Get Docusign OAuth2 Access Token

let json_token = chilkat::JsonObject::new();
if json_token.load_file("qa_data/tokens/docusign.json").is_err() {
    println!("Failed to load docusign.json");
    return;
}

// The access token JSON looks like this:

// {
//   "access_token": "eyJ0eXA....YQyig",
//   "token_type": "Bearer",
//   "refresh_token": "eyJ0eXA....auE3eHKg",
//   "expires_in": 28800
// }

let oauth2 = chilkat::OAuth2::new();

// For the developer sandbox environment, the token endpoint is https://account-d.docusign.com/oauth/token
// For the production platform, the token endpoint is https://account.docusign.com/oauth/token
oauth2.set_token_endpoint("https://account-d.docusign.com/oauth/token");

// Replace these with actual values.
// The client ID is also known as the "integration key" in Docusign.
oauth2.set_client_id("MY_DOCUSIGN_CLIENT_ID");
// This is your secret key for the authorization code grant.
oauth2.set_client_secret("MY_DOCUSIGN_CLIENT_SECRET");

// Get the "refresh_token"
oauth2.set_refresh_token(&json_token.string_of("refresh_token").unwrap_or_default());

// Send the HTTP POST to refresh the access token..
if oauth2.refresh_access_token().is_err() {
    println!("{}", oauth2.last_error_text());
    return;
}

println!("New access token: {}", oauth2.access_token());
println!("New refresh token: {}", oauth2.refresh_token());

// Update the JSON with the new tokens.
let _ = json_token.update_string("access_token", &oauth2.access_token());
let _ = json_token.update_string("refresh_token", &oauth2.refresh_token());

// Save the new JSON access token response to a file.
let sb_json = chilkat::StringBuilder::new();
json_token.set_emit_compact(false);
let _ = json_token.emit_sb(&sb_json);
let _ = sb_json.write_file("qa_data/tokens/docusign.json", "utf-8", false);

println!("OAuth2 authorization granted!");
println!("New Access Token = {}", oauth2.access_token());