PHP curl not working with dropbox OAuth, returns "invalid request"

Question

Dropbox documentation says to authenticate you have to do the following:

curl https://api.dropbox.com/oauth2/token \
    -d code=<AUTHORIZATION_CODE> \
    -d grant_type=authorization_code \
    -d redirect_uri=<REDIRECT_URI> \
    -u <APP_KEY>:<APP_SECRET>

Here is my attempt with PHP but dropbox returns following error invalid request - The request parameters do not match any of the supported authorization flows

$url = "https://api.dropbox.com/oauth2/token";
            $redirect_uri = 'https://www.mywebsite.com/oauth_dropbox';
           
            $postfields = array(
                'code' => $_GET['code'],
                'grant_type' => 'authorization_code',
                'redirect_uri' => $redirect_uri
            );

            $auth = "$app_key:$app_secret";
            $curl = curl_init($url);

            curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
            curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($postfields));
            curl_setopt($curl, CURLOPT_USERPWD, $auth);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

            $json_response = curl_exec($curl);
            $responseObj = json_decode($json_response);

How do i solve?

did you check your curl error ?

Aqib Javed
– Aqib Javed

2022-04-11 10:27:28 +00:00
Commented Apr 11, 2022 at 10:27 — Aqib Javed
– Aqib Javed, Commented Apr 11, 2022 at 10:27
Yes, no errors.

user892134
– user892134

2022-04-11 10:29:20 +00:00
Commented Apr 11, 2022 at 10:29 — user892134
– user892134, Commented Apr 11, 2022 at 10:29

Greg · Accepted Answer · 2022-04-11 15:46:27Z

1

It looks like this works if you explicitly set Basic authorization, that is, instead of:

curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);

set this:

curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);

answered Apr 11, 2022 at 15:46

Greg

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Comments

Justinas · Accepted Answer · 2022-04-11 10:31:35Z

0

Your current curl sends GET request (that's why external API does not see any parameters sent), but you are adding content as it's POST request. Add CURLOPT_POST too.

$url = "https://api.dropbox.com/oauth2/token";
$redirect_uri = 'https://www.mywebsite.com/oauth_dropbox';
           
$postfields = [
    'code' => $_GET['code'],
    'grant_type' => 'authorization_code',
    'redirect_uri' => $redirect_uri
];

$auth = "$app_key:$app_secret";
$curl = curl_init($url);

curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($postfields));
curl_setopt($curl, CURLOPT_USERPWD, $auth);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

$json_response = curl_exec($curl);
$responseObj = json_decode($json_response);

answered Apr 11, 2022 at 10:31

Justinas

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3 Comments

user892134 Over a year ago

Same error returned from dropbox?

Justinas Over a year ago

@user892134 Try without http_build_query. This question states that it was wrong ContentType header: dropboxforum.com/t5/Dropbox-API-Support-Feedback/…

Justinas Over a year ago

Also try importing your curl-cli code to Postman and then exporting it as curl-php, to see what actually generated

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