FETCHING ACCESS TOKEN FOR EINSTEIN PLATFORM SERVICES AUTHNTICATION USING JWT

FETCHING ACCESS TOKEN FOR EINSTEIN PLATFORM SERVICES AUTHNTICATION USING JWT

JSON Web Token:

JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed. JWTs can be signed using a secret (with the HMAC algorithm) or a public/private key pair using RSA or ECDSA.

Although JWTs can be encrypted to also provide secrecy between parties, we will focus on signed tokens. Signed tokens can verify the integrity of the claims contained within it, while encrypted tokens hide those claims from other parties. When tokens are signed using public/private key pairs, the signature also certifies that only the party holding the private key is the one that signed it.

Utility of JWT:

Authorization: This is the most common scenario for using JWT. Once the user is logged in, each subsequent request will include the JWT, allowing the user to access routes, services, and resources that are permitted with that token. Single Sign On is a feature that widely uses JWT nowadays, because of its small overhead and its ability to be easily used across different domains.

Information Exchange: JSON Web Tokens are a good way of securely transmitting information between parties. Because JWTs can be signed—for example, using public/private key pairs—you can be sure the senders are who they say they are. Additionally, as the signature is calculated using the header and the payload, you can also verify that the content hasn't been tampered with.

Salesforce has provided a manual way of getting the access token from https://api.einstein.ai/token

Steps to get the access token using apex code:

· Create Einstein Platform Services Account: https://api.einstein.ai/signup, where we get a private key.

· Download that key and upload that key in your salesforce org.

· Add JWT and JWTbearerFlow classes in your org. https://github.com/salesforceidentity/jwt

· Create a remote site setting of https://api.einstein.ai

· Use this code to get the access token of Einstein AI:

JWT jwt = new JWT('RS256'); // Initializing JWT

ContentVersion base64Content = [SELECT Title, VersionData FROM ContentVersion where title='einstein_platform']; // query to fetch the private key form the files

String keyContents = base64Content.VersionData.tostring();

keyContents = keyContents.replace('-----BEGIN RSA PRIVATE KEY-----', '');

keyContents = keyContents.replace('-----END RSA PRIVATE KEY-----', '');

keyContents = keyContents.replace('\n', '');

jwt.pkcs8 = keyContents;

jwt.aud = 'https://api.einstein.ai/v1/oauth2/token'; // End point of the authorization URL

jwt.validFor = integer.valueOf(200000); // timestamp in seconds

jwt.iss = 'developer.force.com'; // Issuer

jwt.sub = '<Your email from where you created Einstein platform services account>';

String access_token = JWTBearerFlow.getAccessToken('https://api.einstein.ai/v1/oauth2/token', jwt); // Command to get the access token using JWT bearer flow

system.debug('access_token - '+access_token); // This is your Access token