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Examples
========
This page provides practical examples of using the SciTokens C++ library for common tasks.
Simple Token Creation
---------------------
This example shows how to create a basic SciToken without signing:
.. code-block:: c
#include <scitokens.h>
#include <stdio.h>
int main() {
// Create a token without a key (for testing)
SciToken token = scitoken_create(NULL);
if (token == NULL) {
fprintf(stderr, "Failed to create token\n");
return 1;
}
// Clean up
scitoken_destroy(token);
printf("Token created successfully\n");
return 0;
}
Creating and Signing a Token
----------------------------
This example demonstrates how to create a key pair and sign a token:
.. code-block:: c
#include <scitokens.h>
#include <stdio.h>
#include <stdlib.h>
// Example EC private key
const char ec_private[] =
"-----BEGIN EC PRIVATE KEY-----\n"
"MHcCAQEEIESSMxT7PLTR9A/aqd+CM0/6vv6fQWqDm0mNx8uE9EbpoAoGCCqGSM49\n"
"AwEHoUQDQgAE1i+ImZ//iQhOPh0OMfZzdbmPH+3G1ouWezolCugQYWIRqNmwq3zR\n"
"EnTbe4EmymTpJ1MJTPP/tCEUP3G/QqQuhA==\n"
"-----END EC PRIVATE KEY-----\n";
// Example EC public key
const char ec_public[] =
"-----BEGIN PUBLIC KEY-----\n"
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE1i+ImZ//iQhOPh0OMfZzdbmPH+3G\n"
"1ouWezolCugQYWIRqNmwq3zREnTbe4EmymTpJ1MJTPP/tCEUP3G/QqQuhA==\n"
"-----END PUBLIC KEY-----\n";
int main() {
char *err_msg = NULL;
// Create a key for signing
SciTokenKey key = scitoken_key_create("test-key", "ES256",
ec_public, ec_private, &err_msg);
if (key == NULL) {
fprintf(stderr, "Failed to create key: %s\n", err_msg);
free(err_msg);
return 1;
}
// Create a token with the key
SciToken token = scitoken_create(key);
if (token == NULL) {
fprintf(stderr, "Failed to create token\n");
scitoken_key_destroy(key);
return 1;
}
// Set issuer claim
int rv = scitoken_set_claim_string(token, "iss",
"https://example.org", &err_msg);
if (rv != 0) {
fprintf(stderr, "Failed to set issuer: %s\n", err_msg);
free(err_msg);
scitoken_destroy(token);
scitoken_key_destroy(key);
return 1;
}
// Serialize the token
char *serialized_token;
rv = scitoken_serialize(token, &serialized_token, &err_msg);
if (rv != 0) {
fprintf(stderr, "Failed to serialize: %s\n", err_msg);
free(err_msg);
} else {
printf("Serialized token: %s\n", serialized_token);
free(serialized_token);
}
// Clean up
scitoken_destroy(token);
scitoken_key_destroy(key);
return 0;
}
Token Validation with Enforcer
------------------------------
This example shows how to use an Enforcer to generate ACLs from a token:
.. code-block:: c
#include <scitokens.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
char *err_msg = NULL;
// First, create and serialize a token (see previous example)
// For this example, we'll assume we have a token
// Create an enforcer
const char *audiences[] = {"https://example.org/", NULL};
Enforcer enforcer = enforcer_create("https://example.org",
audiences, &err_msg);
if (enforcer == NULL) {
fprintf(stderr, "Failed to create enforcer: %s\n", err_msg);
free(err_msg);
return 1;
}
// Assuming we have a valid token from previous steps
SciToken token = NULL; // This would be your deserialized token
// Generate ACLs from the token
Acl *acls = NULL;
int rv = enforcer_generate_acls(enforcer, token, &acls, &err_msg);
if (rv != 0) {
fprintf(stderr, "Failed to generate ACLs: %s\n", err_msg);
free(err_msg);
} else {
// Print the ACLs
for (int i = 0; acls[i].authz != NULL || acls[i].resource != NULL; i++) {
printf("ACL %d: %s on %s\n", i,
acls[i].authz ? acls[i].authz : "(null)",
acls[i].resource ? acls[i].resource : "(null)");
}
// Free the ACLs
enforcer_acl_free(acls);
}
// Clean up
enforcer_destroy(enforcer);
if (token) scitoken_destroy(token);
return 0;
}
Complete Example: Create, Sign, and Validate
--------------------------------------------
This comprehensive example demonstrates the full workflow:
.. code-block:: c
#include <scitokens.h>
#include <stdio.h>
#include <stdlib.h>
int main() {
char *err_msg = NULL;
int rv;
// Keys for this example
const char ec_private[] = "-----BEGIN EC PRIVATE KEY-----\n"
"MHcCAQEEIESSMxT7PLTR9A/aqd+CM0/6vv6fQWqDm0mNx8uE9EbpoAoGCCqGSM49\n"
"AwEHoUQDQgAE1i+ImZ//iQhOPh0OMfZzdbmPH+3G1ouWezolCugQYWIRqNmwq3zR\n"
"EnTbe4EmymTpJ1MJTPP/tCEUP3G/QqQuhA==\n"
"-----END EC PRIVATE KEY-----\n";
const char ec_public[] = "-----BEGIN PUBLIC KEY-----\n"
"MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE1i+ImZ//iQhOPh0OMfZzdbmPH+3G\n"
"1ouWezolCugQYWIRqNmwq3zREnTbe4EmymTpJ1MJTPP/tCEUP3G/QqQuhA==\n"
"-----END PUBLIC KEY-----\n";
// Step 1: Create signing key
SciTokenKey key = scitoken_key_create("1", "ES256",
ec_public, ec_private, &err_msg);
if (!key) {
fprintf(stderr, "Failed to create key: %s\n", err_msg);
free(err_msg);
return 1;
}
// Step 2: Create and configure token
SciToken token = scitoken_create(key);
if (!token) {
fprintf(stderr, "Failed to create token\n");
scitoken_key_destroy(key);
return 1;
}
// Set token claims
rv = scitoken_set_claim_string(token, "iss",
"https://demo.scitokens.org/gtest", &err_msg);
if (rv != 0) {
fprintf(stderr, "Failed to set issuer: %s\n", err_msg);
goto cleanup;
}
rv = scitoken_set_claim_string(token, "aud",
"https://demo.scitokens.org/", &err_msg);
if (rv != 0) {
fprintf(stderr, "Failed to set audience: %s\n", err_msg);
goto cleanup;
}
rv = scitoken_set_claim_string(token, "scope", "read:/data", &err_msg);
if (rv != 0) {
fprintf(stderr, "Failed to set scope: %s\n", err_msg);
goto cleanup;
}
// Step 3: Serialize token
char *serialized;
rv = scitoken_serialize(token, &serialized, &err_msg);
if (rv != 0) {
fprintf(stderr, "Failed to serialize: %s\n", err_msg);
goto cleanup;
}
printf("Created token: %s\n", serialized);
// Step 4: Store public key for validation
rv = scitoken_store_public_ec_key("https://demo.scitokens.org/gtest",
"1", ec_public, &err_msg);
if (rv != 0) {
fprintf(stderr, "Failed to store public key: %s\n", err_msg);
free(serialized);
goto cleanup;
}
// Step 5: Deserialize and validate
SciToken parsed_token;
const char *allowed_issuers[] = {"https://demo.scitokens.org/gtest", NULL};
rv = scitoken_deserialize(serialized, &parsed_token,
allowed_issuers, &err_msg);
free(serialized);
if (rv != 0) {
fprintf(stderr, "Failed to deserialize: %s\n", err_msg);
goto cleanup;
}
printf("Token validation successful!\n");
// Step 6: Create enforcer and generate ACLs
const char *audiences[] = {"https://demo.scitokens.org/", NULL};
Enforcer enforcer = enforcer_create("https://demo.scitokens.org/gtest",
audiences, &err_msg);
if (enforcer) {
Acl *acls;
rv = enforcer_generate_acls(enforcer, parsed_token, &acls, &err_msg);
if (rv == 0) {
printf("Generated ACLs:\n");
for (int i = 0; acls[i].authz || acls[i].resource; i++) {
printf(" %s: %s\n",
acls[i].authz ? acls[i].authz : "(null)",
acls[i].resource ? acls[i].resource : "(null)");
}
enforcer_acl_free(acls);
}
enforcer_destroy(enforcer);
}
scitoken_destroy(parsed_token);
cleanup:
if (err_msg) free(err_msg);
scitoken_destroy(token);
scitoken_key_destroy(key);
return rv;
}
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