Unable to get data from the the Microsoft Graph API.
private String getUserNamesFromGraph() throws Exception {
String bearerToken = "Bearer "+getAccessToken();
String url = "https://graph.microsoft.com/v1.0/users";
String returnData = null;
try {
URL apiURL = new URL(url);
URLConnection con = apiURL.openConnection();
con.setRequestProperty("Authorization", bearerToken);
con.setRequestProperty("Content-Type", "application/json");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
returnData = response.toString();
System.out.println(returnData);
} catch(Exception e) {
System.out.println(e);
}
return returnData;
}
private String getAccessToken() throws Exception {
String url = "https://login.microsoftonline.com/common/oauth2/v2.0/token";
URL obj = new URL(url);
HttpsURLConnection con = (HttpsURLConnection) obj.openConnection();
// header
con.setRequestMethod("POST");
con.setRequestProperty("User-Agent", "eTarget API");
con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
String urlParameters = "client_id=***
APPLICATION ID FROM APPLICATION REGISTRATION PORTAL ***&scope=https%3A%2F%2Fgraph.microsoft.com%2F.default&client_secret=***
APPLICATION SECRET FROM APPLICATION REGISTRATION PORTAL ***&grant_type=client_credentials";
// Send post request
con.setDoOutput(true);
DataOutputStream wr = new DataOutputStream(con.getOutputStream());
wr.writeBytes(urlParameters);
wr.flush();
wr.close();
int responseCode = con.getResponseCode();
System.out.println("\nSending 'POST' request to URL : " + url);
System.out.println("Post parameters : " + urlParameters);
System.out.println("Response Code : " + responseCode);
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
//print result
String returnData = response.toString();
System.out.println(returnData);
Map jsonTokenData = new Gson().fromJson(returnData, Map.class);
String accessToken = (String)jsonTokenData.get("access_token");
//System.out.println(accessToken);
return accessToken;
}
- The application is registered
- I have a method
getAccessToken()
that successfully returns an access token - The method
getUserNamesFromGraph()
however returns a 401 Unauthorized instead of the expected data.
I've gone through the documentation countless times, trying different variations and endpoints but to no avail. Any ideas appreciated.