@fullerstack/ngx-jwt
Version:
A simple JWT library for Angular applications
131 lines • 15.4 kB
JavaScript
/**
* @license
* Copyright Neekware Inc. All Rights Reserved.
*
* Use of this source code is governed by a proprietary notice
* that can be found at http://neekware.com/license/PRI.html
*/
/* eslint-disable @typescript-eslint/no-explicit-any */
import { Injectable } from '@angular/core';
import { ConfigService, DefaultApplicationConfig, } from '@fullerstack/ngx-config';
import { LoggerService } from '@fullerstack/ngx-logger';
import { Base64 } from 'js-base64';
import { cloneDeep as ldDeepClone, mergeWith as ldMergeWith } from 'lodash-es';
import { DefaultJwtConfig } from './jwt.default';
import * as i0 from "@angular/core";
import * as i1 from "@fullerstack/ngx-config";
import * as i2 from "@fullerstack/ngx-logger";
/**
* An injectable class that handles JWT service
*/
export class JwtService {
/**
* Class constructor
* @param options an optional configuration object
*/
constructor(config, logger) {
this.config = config;
this.logger = logger;
this.nameSpace = 'JWT';
this.options = DefaultApplicationConfig;
this.options = ldMergeWith(ldDeepClone({ jwt: DefaultJwtConfig }), this.config.options, (dest, src) => (Array.isArray(dest) ? src : undefined));
this.logger.info(`[${this.nameSpace}] JwtService ready ...`);
}
/**
* Gets the payload portion of a JWT token
* @param token JWT token (base64 encrypted)
* @returns a payload object or null if decode fails
*/
getPayload(token) {
let parts = [];
try {
parts = token.split('.');
if (parts.length !== 3) {
throw Error('JWT must have 3 parts');
}
}
catch (e) {
this.logger.error(e.message);
return undefined;
}
try {
const decoded = Base64.decode(parts[1]);
const payload = JSON.parse(decoded);
return payload;
}
catch (e) {
this.logger.error('Cannot decode the token');
}
return undefined;
}
/**
* Tells if a JWT is token is expired
* @param payload JWT payload object
* @return true if JWT is already expired, else false
*/
isExpired(payload) {
if (typeof payload === 'string') {
payload = this.getPayload(payload);
}
if (payload) {
const offset = (parseInt(payload.lee, 10) || this.options.jwt.expiryLeeway) * 1000;
const now = this.utcSeconds();
const expiry = this.utcSeconds(payload.exp);
const expired = now > expiry + offset;
return expired;
}
return true;
}
/**
* Calculates the next refresh time
* @param payload JWT payload object
* @param offset if true, a random time is added to the refresh time
* where networkDelay < random < leeway
* @returns total number of seconds till expiry or 0 if token is expired
*/
getRefreshTime(payload, offset = true) {
if (typeof payload === 'string') {
payload = this.getPayload(payload);
}
if (payload && !this.isExpired(payload)) {
const now = this.utcSeconds();
const expiry = this.utcSeconds(payload.exp);
const refresh = Math.floor((expiry - now) / 1000);
const random = this.getRandomOffset(payload);
const time = offset ? refresh + random : refresh;
return time;
}
return 0;
}
/**
* Calculates a random number where networkDelay < random < leeway
* @param payload JWT payload object
* @returns a random total number of seconds
*/
getRandomOffset(payload) {
if (typeof payload === 'string') {
payload = this.getPayload(payload);
}
const leeway = payload?.leeway || payload?.lee || this.options?.jwt?.expiryLeeway;
const range = {
lower: 1,
upper: leeway - this.options?.jwt?.networkDelay || 2,
};
return Math.floor(Math.random() * range.upper + range.lower);
}
/**
* Calculates the UTC value of date/time in seconds
* @param input date/time in seconds
* @returns UTC value of date/time in seconds
*/
utcSeconds(input) {
return input ? new Date(0).setUTCSeconds(input).valueOf() : new Date().valueOf();
}
}
JwtService.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.1.1", ngImport: i0, type: JwtService, deps: [{ token: i1.ConfigService }, { token: i2.LoggerService }], target: i0.ɵɵFactoryTarget.Injectable });
JwtService.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.1.1", ngImport: i0, type: JwtService, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.1.1", ngImport: i0, type: JwtService, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.ConfigService }, { type: i2.LoggerService }]; } });
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All Rights Reserved.\n *\n * Use of this source code is governed by a proprietary notice\n * that can be found at http://neekware.com/license/PRI.html\n */\n\n/* eslint-disable @typescript-eslint/no-explicit-any */\nimport { Injectable } from '@angular/core';\nimport {\n  ApplicationConfig,\n  ConfigService,\n  DefaultApplicationConfig,\n} from '@fullerstack/ngx-config';\nimport { LoggerService } from '@fullerstack/ngx-logger';\nimport { Base64 } from 'js-base64';\nimport { cloneDeep as ldDeepClone, mergeWith as ldMergeWith } from 'lodash-es';\nimport { DeepReadonly } from 'ts-essentials';\n\nimport { DefaultJwtConfig } from './jwt.default';\n\n/**\n * An injectable class that handles JWT service\n */\n@Injectable({ providedIn: 'root' })\nexport class JwtService {\n  private nameSpace = 'JWT';\n  options: DeepReadonly<ApplicationConfig> = DefaultApplicationConfig;\n\n  /**\n   * Class constructor\n   * @param options an optional configuration object\n   */\n  constructor(readonly config: ConfigService, readonly logger: LoggerService) {\n    this.options = ldMergeWith(\n      ldDeepClone({ jwt: DefaultJwtConfig }),\n      this.config.options,\n      (dest, src) => (Array.isArray(dest) ? src : undefined)\n    );\n\n    this.logger.info(`[${this.nameSpace}] JwtService ready ...`);\n  }\n\n  /**\n   * Gets the payload portion of a JWT token\n   * @param token JWT token (base64 encrypted)\n   * @returns a payload object or null if decode fails\n   */\n  getPayload<T>(token: string): any {\n    let parts = [];\n\n    try {\n      parts = token.split('.');\n      if (parts.length !== 3) {\n        throw Error('JWT must have 3 parts');\n      }\n    } catch (e) {\n      this.logger.error(e.message);\n      return undefined;\n    }\n\n    try {\n      const decoded = Base64.decode(parts[1]);\n      const payload = JSON.parse(decoded);\n      return payload as T;\n    } catch (e) {\n      this.logger.error('Cannot decode the token');\n    }\n\n    return undefined;\n  }\n\n  /**\n   * Tells if a JWT is token is expired\n   * @param payload JWT payload object\n   * @return true if JWT is already expired, else false\n   */\n  isExpired(payload: any): boolean {\n    if (typeof payload === 'string') {\n      payload = this.getPayload(payload);\n    }\n    if (payload) {\n      const offset = (parseInt(payload.lee, 10) || this.options.jwt.expiryLeeway) * 1000;\n      const now = this.utcSeconds();\n      const expiry = this.utcSeconds(payload.exp);\n      const expired = now > expiry + offset;\n      return expired;\n    }\n    return true;\n  }\n\n  /**\n   * Calculates the next refresh time\n   * @param payload JWT payload object\n   * @param offset if true, a random time is added to the refresh time\n   * where networkDelay < random < leeway\n   * @returns total number of seconds till expiry or 0 if token is expired\n   */\n  getRefreshTime(payload: any, offset = true): number {\n    if (typeof payload === 'string') {\n      payload = this.getPayload(payload);\n    }\n    if (payload && !this.isExpired(payload)) {\n      const now = this.utcSeconds();\n      const expiry = this.utcSeconds(payload.exp);\n      const refresh = Math.floor((expiry - now) / 1000);\n      const random = this.getRandomOffset(payload);\n      const time = offset ? refresh + random : refresh;\n      return time;\n    }\n    return 0;\n  }\n\n  /**\n   * Calculates a random number where networkDelay < random < leeway\n   * @param payload JWT payload object\n   * @returns a random total number of seconds\n   */\n  private getRandomOffset(payload: any): number {\n    if (typeof payload === 'string') {\n      payload = this.getPayload(payload);\n    }\n    const leeway = payload?.leeway || payload?.lee || this.options?.jwt?.expiryLeeway;\n    const range = {\n      lower: 1,\n      upper: leeway - this.options?.jwt?.networkDelay || 2,\n    };\n    return Math.floor(Math.random() * range.upper + range.lower);\n  }\n\n  /**\n   * Calculates the UTC value of date/time in seconds\n   * @param input date/time in seconds\n   * @returns UTC value of date/time in seconds\n   */\n  private utcSeconds(input?: number): number {\n    return input ? new Date(0).setUTCSeconds(input).valueOf() : new Date().valueOf();\n  }\n}\n"]}