Upload photo from firebase storage URL to facebook

0
votes

My app should post a taken picture to facebook. The photo is stored to my firebase storage bucket. I´m getting the URL from this photo and pass that to facebook.

The URL: 

https://firebasestorage.googleapis.com/v0/b/gettoworkout-50cd0.appspot.com/o/post%2F-Kbo3hZgL8DUqQv_vYZ2.jpg?alt=media&token=ce764afe-2f2e-4632-b978-f3f2cc65f9cc

This is the Graph API I´m calling:

me/photos?token=mytoken&caption=test&url=https://firebasestorage.googleapis.com/v0/b/gettoworkout-50cd0.appspot.com/o/post%2F-Kbo3hZgL8DUqQv_vYZ2.jpg?alt=media&token=ce764afe-2f2e-4632-b978-f3f2cc65f9cc&method=post

A normal file URL apart from firebase works fine. So my suggestion is, that facebook is not getting the file because of the alt=media and token=token attributes from firebase.

If I paste this URL to the browser, the image is downloaded not shown.

How to upload that image to Facebook?

1
facebook-graph-apifirebasefirebase-storage
“How to bypass this?” – by applying proper URL-encoding to the value that you are putting into a URL, of course. – CBroe
This URL is from the firebase getDownloadURL function. This is a valid URL scheme. But Facebook is not accepting it. An html img tag does accept it and shows the image correctly – m1crdy
I did not say the URL was not valid - what you are doing with it (inserting it as a parameter value into another URL) is wrong, because you neglected to apply proper URL encoding to the parameter value. – CBroe
You don’t encode single characters, you encode the whole value. And once you properly do that, it works perfectly fine: graph.facebook.com/me/…{add_access_token_here} – CBroe
Awesome it works. I used JS encodeURI() function. If you would post this as answer, I´m accepting it. Thank you!! – m1crdy

1 Answers

2
votes

You are putting one URL into another URL here, as a parameter value.

So you need to properly URL-encode the value - so that the “special characters” it contains that have a defined meaning in a URL are not ambiguous.

In PHP, urlencode would be the proper function to use; other languages should have similar functions or tools available for this.