@auth0/angular-jwt
Version:
JSON Web Token helper library for Angular
109 lines • 13.6 kB
JavaScript
// tslint:disable:no-bitwise
import { Injectable, Inject } from "@angular/core";
import { JWT_OPTIONS } from "./jwtoptions.token";
export class JwtHelperService {
constructor(config = null) {
this.tokenGetter = (config && config.tokenGetter) || function () { };
}
urlBase64Decode(str) {
let output = str.replace(/-/g, "+").replace(/_/g, "/");
switch (output.length % 4) {
case 0: {
break;
}
case 2: {
output += "==";
break;
}
case 3: {
output += "=";
break;
}
default: {
throw new Error("Illegal base64url string!");
}
}
return this.b64DecodeUnicode(output);
}
// credits for decoder goes to https://github.com/atk
b64decode(str) {
const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
let output = "";
str = String(str).replace(/=+$/, "");
if (str.length % 4 === 1) {
throw new Error("'atob' failed: The string to be decoded is not correctly encoded.");
}
for (
// initialize result and counters
let bc = 0, bs, buffer, idx = 0;
// get next character
(buffer = str.charAt(idx++));
// character found in table? initialize bit storage and add its ascii value;
~buffer &&
((bs = bc % 4 ? bs * 64 + buffer : buffer),
// and if not first of each 4 characters,
// convert the first 8 bits to one ascii character
bc++ % 4)
? (output += String.fromCharCode(255 & (bs >> ((-2 * bc) & 6))))
: 0) {
// try to find character in table (0-63, not found => -1)
buffer = chars.indexOf(buffer);
}
return output;
}
b64DecodeUnicode(str) {
return decodeURIComponent(Array.prototype.map
.call(this.b64decode(str), (c) => {
return "%" + ("00" + c.charCodeAt(0).toString(16)).slice(-2);
})
.join(""));
}
decodeToken(token = this.tokenGetter()) {
if (!token || token === "") {
return null;
}
const parts = token.split(".");
if (parts.length !== 3) {
throw new Error("The inspected token doesn't appear to be a JWT. Check to make sure it has three parts and see https://jwt.io for more.");
}
const decoded = this.urlBase64Decode(parts[1]);
if (!decoded) {
throw new Error("Cannot decode the token.");
}
return JSON.parse(decoded);
}
getTokenExpirationDate(token = this.tokenGetter()) {
let decoded;
decoded = this.decodeToken(token);
if (!decoded || !decoded.hasOwnProperty("exp")) {
return null;
}
const date = new Date(0);
date.setUTCSeconds(decoded.exp);
return date;
}
isTokenExpired(token = this.tokenGetter(), offsetSeconds) {
if (!token || token === "") {
return true;
}
const date = this.getTokenExpirationDate(token);
offsetSeconds = offsetSeconds || 0;
if (date === null) {
return false;
}
return !(date.valueOf() > new Date().valueOf() + offsetSeconds * 1000);
}
getAuthScheme(authScheme, request) {
if (typeof authScheme === "function") {
return authScheme(request);
}
return authScheme;
}
}
JwtHelperService.decorators = [
{ type: Injectable }
];
JwtHelperService.ctorParameters = () => [
{ type: undefined, decorators: [{ type: Inject, args: [JWT_OPTIONS,] }] }
];
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{ HttpRequest } from \"@angular/common/http\";\n// tslint:disable:no-bitwise\n\nimport { Injectable, Inject } from \"@angular/core\";\nimport { JWT_OPTIONS } from \"./jwtoptions.token\";\n\n@Injectable()\nexport class JwtHelperService {\n  tokenGetter: () => string;\n\n  constructor(@Inject(JWT_OPTIONS) config = null) {\n    this.tokenGetter = (config && config.tokenGetter) || function () {};\n  }\n\n  public urlBase64Decode(str: string): string {\n    let output = str.replace(/-/g, \"+\").replace(/_/g, \"/\");\n    switch (output.length % 4) {\n      case 0: {\n        break;\n      }\n      case 2: {\n        output += \"==\";\n        break;\n      }\n      case 3: {\n        output += \"=\";\n        break;\n      }\n      default: {\n        throw new Error(\"Illegal base64url string!\");\n      }\n    }\n    return this.b64DecodeUnicode(output);\n  }\n\n  // credits for decoder goes to https://github.com/atk\n  private b64decode(str: string): string {\n    const chars =\n      \"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\";\n    let output = \"\";\n\n    str = String(str).replace(/=+$/, \"\");\n\n    if (str.length % 4 === 1) {\n      throw new Error(\n        \"'atob' failed: The string to be decoded is not correctly encoded.\"\n      );\n    }\n\n    for (\n      // initialize result and counters\n      let bc = 0, bs: any, buffer: any, idx = 0;\n      // get next character\n      (buffer = str.charAt(idx++));\n      // character found in table? initialize bit storage and add its ascii value;\n      ~buffer &&\n      ((bs = bc % 4 ? bs * 64 + buffer : buffer),\n      // and if not first of each 4 characters,\n      // convert the first 8 bits to one ascii character\n      bc++ % 4)\n        ? (output += String.fromCharCode(255 & (bs >> ((-2 * bc) & 6))))\n        : 0\n    ) {\n      // try to find character in table (0-63, not found => -1)\n      buffer = chars.indexOf(buffer);\n    }\n    return output;\n  }\n\n  private b64DecodeUnicode(str: any) {\n    return decodeURIComponent(\n      Array.prototype.map\n        .call(this.b64decode(str), (c: any) => {\n          return \"%\" + (\"00\" + c.charCodeAt(0).toString(16)).slice(-2);\n        })\n        .join(\"\")\n    );\n  }\n\n  public decodeToken<T = any>(token: string = this.tokenGetter()): T {\n    if (!token || token === \"\") {\n      return null;\n    }\n\n    const parts = token.split(\".\");\n\n    if (parts.length !== 3) {\n      throw new Error(\n        \"The inspected token doesn't appear to be a JWT. Check to make sure it has three parts and see https://jwt.io for more.\"\n      );\n    }\n\n    const decoded = this.urlBase64Decode(parts[1]);\n    if (!decoded) {\n      throw new Error(\"Cannot decode the token.\");\n    }\n\n    return JSON.parse(decoded);\n  }\n\n  public getTokenExpirationDate(\n    token: string = this.tokenGetter()\n  ): Date | null {\n    let decoded: any;\n    decoded = this.decodeToken(token);\n\n    if (!decoded || !decoded.hasOwnProperty(\"exp\")) {\n      return null;\n    }\n\n    const date = new Date(0);\n    date.setUTCSeconds(decoded.exp);\n\n    return date;\n  }\n\n  public isTokenExpired(\n    token: string = this.tokenGetter(),\n    offsetSeconds?: number\n  ): boolean {\n    if (!token || token === \"\") {\n      return true;\n    }\n    const date = this.getTokenExpirationDate(token);\n    offsetSeconds = offsetSeconds || 0;\n\n    if (date === null) {\n      return false;\n    }\n\n    return !(date.valueOf() > new Date().valueOf() + offsetSeconds * 1000);\n  }\n\n  public getAuthScheme(\n    authScheme: Function | string | undefined,\n    request: HttpRequest<any>\n  ): string {\n    if (typeof authScheme === \"function\") {\n      return authScheme(request);\n    }\n\n    return authScheme;\n  }\n}\n"]}