Universal Containers (UC) is building an integration between Salesforce and a legacy web application using...

The Canvas framework supports OAuth 2.0 for authorization1. There are two OAuth flows that can be used to authenticate the third-party app using the canvas framework: User-Agent OAuth Flow and Web Server OAuth Flow2. The User-Agent OAuth Flow uses the Canvas JavaScript SDK to obtain an OAuth token by using the login function in the SDK2. The Web Server OAuth Flow redirects the user to the Salesforce OAuthauthorization endpoint and then obtains an OAuth access token by making a POST request to the Salesforce OAuth token endpoint2. Both of these flows allow the third-party app to authenticate itself against Salesforce as the IdP. The SAML Single Sign-on flow can also be used to allow the third-party app to authenticate itself against UC’s IdP, which is another option for authentication3.