Rust

Get Firebase Access Token from JSON Service Account Private Key

See more Firebase Examples

Demonstrates how to get a Firebase access token using a JSON service account private key. Your Firebase service account can be used to authenticate multiple Firebase features, such as Database, Storage and Auth, programmatically.

A Firebase JSON service account private key can be created in the Firebase settings/admin portion of the console.firebase.google.com site as shown here:

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Rust

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

// First load the Firebase JSON private key into a string.
let fac = chilkat::FileAccess::new();
let Ok(json_key) = fac.read_entire_text_file("qa_data/firebase/firebase-chilkat-firebase-adminsdk-n28n4-1b664ee163.json", "utf-8") else {
    println!("{}", fac.last_error_text());
    return;
};

// A Firebase JSON private key should look something like this:

// { 
//   "type": "service_account",
//   "project_id": "firebase-chilkat",
//   "private_key_id": "1c664ee164907413c91ddefcf5b765ecba8779e2",
//   "private_key": "-----BEGIN PRIVATE KEY-----\nMIIEvQIBA ... Ya2UZii/lXn73/ZOK8=\n-----END PRIVATE KEY-----\n",
//   "client_email": "firebase-adminsdk-n28n4@firebase-chilkat.iam.gserviceaccount.com",
//   "client_id": "134846322329335418431",
//   "auth_uri": "https://accounts.google.com/o/oauth2/auth",
//   "token_uri": "https://accounts.google.com/o/oauth2/token",
//   "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
//   "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-n28n4%40firebase-chilkat.iam.gserviceaccount.com"
// } 
// 

let g_auth = chilkat::AuthGoogle::new();
g_auth.set_json_key(&json_key);

// Choose a scope.
// The scope could be "https://www.googleapis.com/auth/firebase.database"
// or a space-delimited list of scopes:
// "https://www.googleapis.com/auth/firebase.database https://www.googleapis.com/auth/userinfo.email"

g_auth.set_scope("https://www.googleapis.com/auth/firebase.database https://www.googleapis.com/auth/userinfo.email");

// Request an access token that is valid for this many seconds.
g_auth.set_expire_num_seconds(3600);

// If the application is requesting delegated access:
// The email address of the user for which the application is requesting delegated access,
// then set the email address here. (Otherwise leave it empty.)
g_auth.set_sub_email_address("");

// Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
// The Chilkat socket object is used so that the connection can be established
// through proxies or an SSH tunnel if desired.
let tls_sock = chilkat::Socket::new();
if tls_sock.connect("www.googleapis.com", 443, true, 5000).is_err() {
    println!("{}", tls_sock.last_error_text());
    return;
}

// Send the request to obtain the access token.
if g_auth.obtain_access_token(&tls_sock).is_err() {
    println!("{}", g_auth.last_error_text());
    return;
}

// Examine the access token:
println!("Firebase Access Token: {}", g_auth.access_token());

// Save the token to a file (or wherever desired).  This token is valid for 1 hour.
let _ = fac.write_entire_text_file("qa_data/tokens/firebaseToken.txt", &g_auth.access_token(), "utf-8", false);