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POFacebook best practice for dual-authentication (client and server)?
 

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  1. POFacebook best practice for dual-authentication (client and server)?
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    <p>I have a hosted facebook app. I hold additional PHOTO-TAG info not stored at facebook. From a device, I allow the user to (1) upload a photo, and (2) store additional photo-tag info at my server (C# MVC)</p> <p>My requirements: 1. photo should go directly to fb. Don't want the user to lose it should my host go down. (I already do this). 2. additional tag info should be authenticated. [if it's not, anyone can save this info about any photo]. (I already save tag-info, but unauthorized in my sandbox)</p> <p>? What's the best practice to: Ensure that when I get a tag-save-request at my server (with a saved photo id), I can verify the user for that photo.</p> <p>I can already do server-auth when FB users access my site from a desktop. I can already do client-auth when my device app connects/uploads the photo. (using 'code' then exchanging it for a token)</p> <p>But, when I pass the access-token from the client to my server, and I try to check it thru FB, I get an #804 (or 803) back about an auth-issue. Clearly not the way to do it.</p> <p>Should I make my device-client go thru my server with a redirect to auth and I capture/save/create some extra token? I'm only worried that I then wouldn't be able to upload directly to FB. Should I pass the code and exchange it for a token at the server (after already exchanging it at the client? can you do it more than once?)</p> <p>(I already know about <a href="http://developers.facebook.com/docs/authentication/" rel="nofollow">http://developers.facebook.com/docs/authentication/</a> but it doesn't (that I can see) address this scenario)</p> <p>Best solutions? Thanks.</p>
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