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/**
* Google OIDC example using Iddawc library
*
* Copyright 2020-2021 Nicolas Mora <mail@babelouest.org>
*
* License MIT
*
* Compile with
* gcc -o google_example google_example.c -liddawc -lyder -ljansson
*/
#include <stdio.h>
#include <string.h>
#include <yder.h>
#include <iddawc.h>
/**
* This is the specific value for Google OIDC API at the time this code was written
*/
#define CONFIG_ENDPOINT "https://accounts.google.com/.well-known/openid-configuration"
/**
* Update the values below with your client values
* Register a new OAuth2 client for Google:
* https://developers.google.com/identity/protocols/OAuth2
*/
#define CLIENT_ID "clientXyz"
#define CLIENT_SECRET "secretXyz"
#define REDIRECT_URI "https://www.example.com/"
#define SCOPE "profile"
int main() {
struct _i_session i_session;
int ret;
char redirect_to[4097] = {0};
y_init_logs("iddawc tests", Y_LOG_MODE_CONSOLE, Y_LOG_LEVEL_DEBUG, NULL, "Google OIDC example");
i_init_session(&i_session);
i_set_parameter_list(&i_session, I_OPT_RESPONSE_TYPE, I_RESPONSE_TYPE_CODE,
I_OPT_OPENID_CONFIG_ENDPOINT, CONFIG_ENDPOINT,
I_OPT_CLIENT_ID, CLIENT_ID,
I_OPT_CLIENT_SECRET, CLIENT_SECRET,
I_OPT_REDIRECT_URI, REDIRECT_URI,
I_OPT_TOKEN_METHOD, I_TOKEN_AUTH_METHOD_SECRET_BASIC,
I_OPT_SCOPE, SCOPE,
I_OPT_STATE_GENERATE, 16,
I_OPT_NONCE_GENERATE, 32,
I_OPT_NONE);
if ((ret = i_get_openid_config(&i_session)) != I_OK) {
y_log_message(Y_LOG_LEVEL_DEBUG, "Error loading openid-configuration: %d", ret);
i_clean_session(&i_session);
return 1;
}
// First step: get redirection to login page
if ((ret = i_build_auth_url_get(&i_session)) != I_OK) {
y_log_message(Y_LOG_LEVEL_DEBUG, "Error building auth request: %d", ret);
i_clean_session(&i_session);
return 1;
}
printf("Redirect to: %s\n", i_get_str_parameter(&i_session, I_OPT_REDIRECT_TO));
// When the user has logged in the external application, gets redirected with a result, we parse the result
y_log_message(Y_LOG_LEVEL_INFO, "Enter redirect URL");
fgets(redirect_to, 4096, stdin);
redirect_to[strlen(redirect_to)-1] = '\0';
i_set_str_parameter(&i_session, I_OPT_REDIRECT_TO, redirect_to);
if (i_parse_redirect_to(&i_session) != I_OK) {
y_log_message(Y_LOG_LEVEL_DEBUG, "Error parsing redirect_to url");
i_clean_session(&i_session);
return 1;
}
// Run the token request, get the refresh and access tokens
if (i_run_token_request(&i_session) != I_OK) {
y_log_message(Y_LOG_LEVEL_DEBUG, "Error running token request");
i_clean_session(&i_session);
return 1;
}
// And finally we load user info using the access token
if (i_get_userinfo(&i_session, 0) != I_OK) {
y_log_message(Y_LOG_LEVEL_DEBUG, "Error loading userinfo");
i_clean_session(&i_session);
return 1;
}
y_log_message(Y_LOG_LEVEL_DEBUG, "userinfo:\n%s", i_get_str_parameter(&i_session, I_OPT_USERINFO));
// Cleanup session
i_clean_session(&i_session);
y_close_logs();
return 0;
}
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