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We are seeking a web developer who can help us integrate the login form from our external website with Microsoft Office 365. We would like to have users be able to sign in from our custom login form on our external website, authenticate against Office 365 (login.microsoftonline.com), and if successful get redirected to Office 365 (e.g. Sharepoint Online).
What are some possible solutions to do this? Our external website is built on WordPress, so the log in form is largely in PHP. We don't have a separate Active Directory service, though I'm open to using some middle-layer tech like OneLogin or OpenID.
If you know how to do this, do not hesitate to bid on this project.