Clash Royale CLAN TAG#URR8PPP

Unable to retrieve access token with Application Only OAuth using Reddit API

So I have read the documentation at the following link https://github.com/reddit-archive/reddit/wiki/OAuth2. I am trying to retrieve an access token for my application which only requires an Application Only OAuth since it does not require the user to insert their credentials. I have followed the instructions on the page mentioned, but I am unable to retrieve the access token and I always get:

""message": "Unauthorized", "error": 401"


Here is my code:

#include "reddit.h"

#include <QtNetwork>
#include <QUuid>

const QString GRANT_URL = "https://oauth.reddit.com/grants/installed_client";
const QString ACCESS_TOKEN_URL = "https://www.reddit.com/api/v1/access_token";
const QByteArray CLIENT_IDENTIFIER = "MYID";

Reddit::Reddit(QObject *parent) : QObject(parent)

mDeviceID = "DO_NOT_TRACK_THIS_DEVICE";
mAuthHeader = "Basic " + CLIENT_IDENTIFIER.toBase64();


void Reddit::getAccessToken()

auto netManager = new QNetworkAccessManager(this);

QUrl requestUrl = buildAccessTokenUrl();
QNetworkRequest netRequest(requestUrl);
netRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
netRequest.setRawHeader("Authorization", mAuthHeader);

auto reply = netManager->post(netRequest, requestUrl.query(QUrl::FullyEncoded).toUtf8());
connect(reply, &QNetworkReply::finished, this, &Reddit::accessTokenRequestFinished);


void Reddit::accessTokenRequestFinished()

auto reply = qobject_cast<QNetworkReply*>(sender());
qDebug() << reply->readAll();

reply->deleteLater();


QUrl Reddit::buildAccessTokenUrl()

QUrl url(ACCESS_TOKEN_URL);

QUrlQuery urlQuery;
urlQuery.addQueryItem("grant_type", GRANT_URL);
urlQuery.addQueryItem("device_id", mDeviceID);
url.setQuery(urlQuery);

return url;



I have registerd my application at https://ssl.reddit.com/prefs/apps/ using the "installed" type option.

1 Answer
1

Ok so I found the problem. I didn't read the 'Basic' HTTP Authentication Scheme and forgot a : in my authorization header which I modified to:

:

mAuthHeader = "Basic " + (CLIENT_IDENTIFIER + ":").toBase64();


By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.