Tumblr OAuth image post gives me 401/“Invalid OAuth credentials”?

I just made a dump of the base string that my app is generating when posting a photo entry to Tumblr. Linebreaks added to lessen the obscurity. Hope it helps.

I just made a dump of the base string that my app is generating when posting a photo entry to Tumblr. Linebreaks added to lessen the obscurity. Hope it helps.

POST&http%3A%2F%2Fwww.tumblr.com%2Fapi%2Fwrite& caption%3D%253Cp%253Etesting%253C%252Fp%253E%26 click-through-url%3D%26 format%3Dhtml%26 generator%3D%253C%2520href%253D%2522http%253A%252F%252Fsudocode. Net%252Fprojects%252Fpicasa-2-tumblr%2522%253EPicasa2Tumblr%253C%252Fa%253E%26 group%3Darvn.tumblr. Com%26 oauth_consumer_key%3Dxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx%26 oauth_nonce%3Db0f187f5d0781b3d6aea0f192e116524%26 oauth_signature_method%3DHMAC-SHA1%26 oauth_timestamp%3D1296560370%26 oauth_token%3DwkR9Jjtnp0tMPHp3aqcxvRd401cUeVX7PzxUrc0Y8SZZRoLHgs%26 oauth_version%3D1.0%26 private%3D0%26 slug%3D%26 state%3Ddraft%26 tags%3D%26 type%3Dphoto One thing, you didn't notify Tumblr that you're going to post a photo using the type parameter.

Thanks, I added the type param back and still failed (edited my question to say so). I wonder if some parameters i'm missing are in fact required and somehow its reported as an oauth failure. Question though: does your Authorization header include only the oauth parameters (the others parameters given as form-data parts) like mine?

– smallduck Feb 14 at 10:29.

Having exactly the same problem with my OAuth implementation in Silverlight - I've implemented the rest of the API without an issue, and this method works if you don't use OAuth and just send email/password headers as well. Arvin's post just showed me the issue though, he's including the other non-file fields in his OAuth. I just did the same to my post, so they were in the multi-part form body but also being added to the OAuth sig - and now I'm uploading photo posts without a problem!

I had the same problem. It was because my I was including a blank Tumblr secret. This is where you get it: tumblr.com/oauth/apps -> "Show secret key" Also, I'm using the xAuth stuff with their https://tumblr.com/oauth/access_token url.

I hope this helps. I'm on Rails with the Devise gem.

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