@citrineos/util/dist/authorization/OidcTokenProvider.js

The OCPP util module which supplies helpful utilities like cache and queue connectors, etc.

// SPDX-FileCopyrightText: 2025 Contributors to the CitrineOS Project
//
// SPDX-License-Identifier: Apache-2.0
import { Logger } from 'tslog';
export class OidcTokenProvider {
    config;
    oidcToken;
    _logger;
    constructor(config, logger) {
        this.config = config;
        this._logger = logger
            ? logger.getSubLogger({ name: this.constructor.name })
            : new Logger({ name: this.constructor.name });
    }
    async getToken() {
        if (this.oidcToken && this.oidcToken.expiresAt > Date.now()) {
            this._logger.debug('Returning cached OIDC token');
            return this.oidcToken.accessToken;
        }
        this._logger.debug('Fetching new OIDC token');
        const response = await fetch(this.config.tokenUrl, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded',
            },
            body: new URLSearchParams({
                grant_type: 'client_credentials',
                client_id: this.config.clientId,
                client_secret: this.config.clientSecret,
                audience: this.config.audience,
            }),
        });
        if (!response.ok) {
            const errorText = await response.text();
            this._logger.error('Failed to fetch OIDC token:', errorText);
            throw new Error(`Failed to fetch OIDC token: ${response.statusText}`);
        }
        const tokenData = await response.json();
        this.oidcToken = {
            accessToken: tokenData.access_token,
            // Set expiry to 1 minute before actual expiration to be safe
            expiresAt: Date.now() + (tokenData.expires_in - 60) * 1000,
        };
        return this.oidcToken.accessToken;
    }
}
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