F12 Shows Your API Key: Hiding Third-Party Tokens Behind an Azure Function
Learn how to keep third-party API keys out of the browser by proxying SPFx web part calls through an Azure Function that swaps in the secret server-side.
Authentication and Authorization
Getting a token and keeping it safe: MSAL and Nested App Auth, PnP.Framework and Graph SDK auth, Easy Auth, and keeping third-party keys out of the browser.
Getting a token is the part of every integration that looks like it will take an hour and takes a day. This topic collects the auth problems I have actually hit rather than a tour of the protocol.
That includes the two client libraries you end up choosing between when talking to SharePoint from C#, and why the choice matters. Nested App Auth in an Outlook add-in, which exists because there is no popup on a phone. Easy Auth on a Function, which will happily reject the very events you configured it to receive. And keeping third-party keys server-side, because hiding a control in the UI is not the same thing as authorising the call behind it.
The through line: the hard part is rarely the token itself. It is where the token is allowed to live.
There's No Popup on a Phone: Nested App Auth for Outlook Add-ins
Learn how to get MSAL tokens inside Outlook on mobile with Nested App Auth (NAA), from the brk-multihub redirect URI to acquireTokenSilent with a loginHint.
Microsoft Graph SDK Authentication in C#: Quick Start Guide
Quick setup guide for Microsoft Graph SDK using your existing app registration
PnP.Framework Authentication in C#: A Beginner's Guide
Learn to authenticate C# applications with PnP.Framework and Azure using certificates in this beginner's guide to app registration and permissions.
SPFx Audience targeting
How to easy implement audience targeting for for one's components
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