Instagram API: force prompt during authentication

Question

Is there a way for the instagram auth(login) to always ask for authentication? This is skipped when the user is logged in and has already authorized the app.

It would be something like twitter's use_authorize=true or google's approval_prompt=force.

Answer 1

I believe that the most simple way is to use next url:

https://instagram.com/accounts/logoutin/?force_classic_login=&next=URLENCODED_INSTAGRAM_OAUTH_URI_PATH_WITH_YOUR_DATA

For example:

window.location.assign('https://instagram.com/accounts/logoutin/?force_classic_login=&next=' + encodeURIComponent('/oauth/authorize/?response_type=code&scope=public_content+follower_list+comments&client_id='+ YOUR_IG_CLIENT_ID + '&redirect_uri='+encodeURIComponent(YOUR_REDIRECT_URI)));

Please take a note that your redirect uri should be encoded twice

Answer 2

I managed to get it working:

I try loading an image with the url of the instagram logout page before opening the authorize popup.
Something like this (coffeescript):

windowOpen = ->
    window.open("/instagram/authorize?...")

if forceLogin
    tryLogout().always ->
        windowOpen()

And the tryLogout function (setTimeout 10seconds as a fallback)

tryLogout: ->
    deferred = $.Deferred()
    logOutImg = new Image()

    logOutImg.onerror = ->
        deferred.resolve()
    logOutImg.onload = ->
        deferred.resolve()

    logOutImg.src = 'https://instagram.com/accounts/logout/'

    setTimeout(->
        deferred.reject()
    , 10000)

    return deferred.promise()