How can i get lifetime Access Token

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Ghost Mjrm wrote:

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error 400 invalid redirect_uri. when response_type=code without PKCE,redirect_uri must start with "https://", unless its a localhost URI

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Ghost Mjrm, you posted already the answer of your question (part of error message). To be able set scheme different than "https" (or similar) you need PKCE auth flow (something you skipped). 😉 That's it - forget about app secret; focus on code challenge and code verifier (parts of PKCE).

PS: Why don't you use the SDK as is (including authentication) and skip re-implementing something already existing there? 🤷

yeah i have noticed it but honestly i don't know what PKCE mean but i will search about it

but im little bit confuse should i create a input key that can the user insert in it  the obtained access token to success the upload to dropbox operation or is there another way that the app automatically read it form the browser and use it

i already have this mechanism in my code but it dont know if it work

i told you im little bit confused and i don't get the complete idea or redirected url so i used ChatGPT To make to me this mechanism so can you please check my code if it good? >:

i just want when the user click on the corner button to start oAuth 2 operation and get access token then my app use this access token to upload the photo to dropbox

Best Regards

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Ghost Mjrm wrote:

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i just want when the user click on the corner button to start oAuth 2 operation and get access token then my app use this access token to upload the photo to dropbox

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If you get access token directly then this token will expire in 4 hours or so. So you go beck at the beginning.

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Ghost Mjrm wrote:

yeah i have noticed it but honestly i don't know what PKCE mean but i will search about it

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PKCE is an alternative way to perform OAuth flow, nothing more. Instead of using app secret, dynamic pair of keys is used (code challenge and code verifier). One is passed in OAuth initiation and other in token receiving (something that guarantees avoid "man in middle" - the same thing what app secret does - just more secure way). 🤫 That's it.

As the message shows, your code is erroneous. You don't need any additional "input key" (whatever it means). Don't rely on AI, but rather on your own intelligence and don't be lazy in reading documentation. 😉😁 AI (of any kind) is NOT so intelligent yet (might become some day but not now).

there is my main code

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private static final int CAMERA_PERMISSION_REQUEST = 100;
    private static final String[] REQUIRED_CAMERA_PERMISSIONS = new String[]{Manifest.permission.CAMERA};

    private static final String DROPBOX_APP_KEY = "hc2p6uj44p9pyoc";
    private static final String DROPBOX_APP_SECRET = "i cannot show this";
    private static final String DROPBOX_REDIRECT_URI = "https://auth-finish";

    private String DROPBOX_ACCESS_TOKEN = null;
    private PreviewView previewView;
    private ImageCapture imageCapture;
    private TextView addressTextView;

    private ExecutorService cameraExecutor = Executors.newSingleThreadExecutor();
    private FusedLocationProviderClient fusedLocationProviderClient;
    private Geocoder geocoder;

    // Add latitude and longitude variables
    private double latitudeValue;
    private double longitudeValue;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        previewView = findViewById(R.id.previewView);
        ImageButton captureButton = findViewById(R.id.captureButton);
        ImageButton leftCornerButton = findViewById(R.id.leftCornerButton);
        addressTextView = findViewById(R.id.addressTextView);

        fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
        geocoder = new Geocoder(this, Locale.getDefault());

        captureButton.setOnClickListener(this);

        leftCornerButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                initiateDropboxAuthorization();
            }
        });

        addressTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showEditAddressDialog();
            }
        });

        if (allPermissionsGranted()) {
            startCamera();
            getLastLocation();
        } else {
            ActivityCompat.requestPermissions(this, REQUIRED_CAMERA_PERMISSIONS, CAMERA_PERMISSION_REQUEST);
        }

        // Initialize Dropbox access token if available
        SharedPreferences prefs = getPreferences(Context.MODE_PRIVATE);
        DROPBOX_ACCESS_TOKEN = prefs.getString("dropboxAccessToken", null);

        // Check if the app was opened with a Dropbox authorization callback
        handleDropboxAuthorizationCallback(getIntent());
    }

    // Override onNewIntent to handle the Dropbox authorization callback
    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);

        // Log the received intent data for debugging
        Log.d("Dropbox", "Received new intent: " + intent);

        // Extract and log the data URI
        Uri data = intent.getData();
        Log.d("Dropbox", "Intent data URI: " + data);

        if (data != null && data.toString().startsWith(DROPBOX_REDIRECT_URI)) {
            // Authorization successful, extract the authorization code
            String code = data.getQueryParameter("code");

            // Log the authorization code for debugging
            Log.d("Dropbox", "Authorization Code: " + code);

            // Now, exchange the authorization code for an access token and refresh token
            exchangeAuthorizationCodeForTokens(code);
        }
    }

    private void initiateDropboxAuthorization() {
        // Construct the Dropbox authorization URL
        String authorizationUrl = "https://www.dropbox.com/oauth2/authorize" +
                "?client_id=" + DROPBOX_APP_KEY +
                "&response_type=code" +
                "&token_access_type=offline" +
                "&state=myState" +  // Replace with your own state
                "&redirect_uri=" + DROPBOX_REDIRECT_URI;

        // Open the authorization URL in a web browser or WebView
        Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(authorizationUrl));
        startActivity(browserIntent);
    }
    private String performPostRequest(String requestUrl, String urlParameters) {
        try {
            URL url = new URL(requestUrl);
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            connection.setRequestProperty("Content-Length", Integer.toString(urlParameters.getBytes().length));
            connection.setDoOutput(true);

            // Log the request details
            Log.d("Dropbox", "POST Request URL: " + requestUrl);
            Log.d("Dropbox", "POST Request Body: " + urlParameters);

            // Write the request body
            try (DataOutputStream wr = new DataOutputStream(connection.getOutputStream())) {
                wr.writeBytes(urlParameters);
                wr.flush();
            }

            // Get the response
            try (InputStream is = connection.getInputStream();
                 BufferedReader rd = new BufferedReader(new InputStreamReader(is))) {
                StringBuilder response = new StringBuilder();
                String line;
                while ((line = rd.readLine()) != null) {
                    response.append(line);
                    response.append('\r');
                }

                // Log the response
                Log.d("Dropbox", "POST Response: " + response.toString());

                return response.toString();
            }
        } catch (Exception e) {
            // Log any exceptions
            Log.e("Dropbox", "Error in HTTP request: " + e.getMessage());
            return null;
        }
    }
    private void handleDropboxAuthorizationCallback(Intent intent) {
        // Log the received intent for debugging
        Log.d("Dropbox", "Handling Dropbox Authorization Callback Intent: " + intent);

        Uri data = intent.getData();
        if (data != null && data.toString().startsWith(DROPBOX_REDIRECT_URI)) {
            // Authorization successful, extract the authorization code
            String code = data.getQueryParameter("code");

            // Log the authorization code for debugging
            Log.d("Dropbox", "Authorization Code: " + code);

            // Now, exchange the authorization code for an access token and refresh token
            exchangeAuthorizationCodeForTokens(code);
        } else {
            // Log a message if the intent data is unexpected
            Log.d("Dropbox", "Invalid Dropbox Authorization Callback Intent Data: " + data);
        }
    }

    private void exchangeAuthorizationCodeForTokens(String code) {
        new AsyncTask<String, Void, Void>() {
            @Override
            protected Void doInBackground(String... params) {
                try {
                    String url = "https://api.dropbox.com/oauth2/token";
                    String requestBody = "code=" + params[0] +
                            "&grant_type=authorization_code" +
                            "&client_id=" + DROPBOX_APP_KEY +
                            "&client_secret=" + DROPBOX_APP_SECRET +
                            "&redirect_uri=" + DROPBOX_REDIRECT_URI;

                    // Log the request details
                    Log.d("Dropbox", "Token Exchange Request URL: " + url);
                    Log.d("Dropbox", "Token Exchange Request Body: " + requestBody);

                    // Perform the POST request and obtain the JSON response
                    String jsonResponse = performPostRequest(url, requestBody);

                    // Log the response
                    Log.d("Dropbox", "Token Exchange Response: " + jsonResponse);

                    // Parse the JSON response to extract access and refresh tokens
                    JSONObject jsonObject = new JSONObject(jsonResponse);
                    DROPBOX_ACCESS_TOKEN = jsonObject.getString("access_token");

                    // Log the obtained access token
                    Log.d("Dropbox", "Access Token Obtained: " + DROPBOX_ACCESS_TOKEN);

                    // Save the Dropbox access token
                    SharedPreferences prefs = getPreferences(Context.MODE_PRIVATE);
                    prefs.edit().putString("dropboxAccessToken", DROPBOX_ACCESS_TOKEN).apply();

                } catch (Exception e) {
                    // Log any exceptions
                    Log.e("Dropbox", "Error in token exchange: " + e.getMessage());
                }
                return null;
            }
        }.execute(code);
    }

private void uploadToDropbox(File photoFile) {
    if (photoFile == null || !photoFile.exists()) {
        runOnUiThread(() -> Toast.makeText(MainActivity.this, "Error: Photo file does not exist", Toast.LENGTH_SHORT).show());
        return;
    }

    if (DROPBOX_ACCESS_TOKEN == null) {
        runOnUiThread(() -> Toast.makeText(MainActivity.this, "Error: Dropbox access token is null", Toast.LENGTH_SHORT).show());
        return;
    }

    DbxRequestConfig config = DbxRequestConfig.newBuilder("Decamera").build();
    DbxClientV2 client = new DbxClientV2(config, DROPBOX_ACCESS_TOKEN);

    try {
        String remotePath = "/Decamera/" + photoFile.getName();

        try (InputStream in = new FileInputStream(photoFile)) {
            FileMetadata metadata = client.files().uploadBuilder(remotePath)
                    .withMode(WriteMode.ADD)
                    .uploadAndFinish(in);

            runOnUiThread(() -> {
                Toast.makeText(MainActivity.this, "Photo uploaded to Dropbox", Toast.LENGTH_SHORT).show();
                // Log metadata information
                Log.d("Dropbox", "File uploaded. Metadata: " + metadata.toString());
            });
        }

    } catch (Exception e) {
        e.printStackTrace();
        runOnUiThread(() -> Toast.makeText(MainActivity.this, "Error uploading to Dropbox: " + e.getMessage(), Toast.LENGTH_SHORT).show());
    }
}

Hm..🤔 Are you still trying some sort of AI? 🧐 Ghost Mjrm, come on... 😁 I believe you have your own; use it! 😉

im not using ai just to copy paste its help to understand the main code to how to exchange authorized code with access token using the app key and app secret and teach me to constructor the link and make post and request method im not using it blindly and its help to create log statments to dedicate the error in the logcat its a powerful but at the end i got upload to dropbox success message but and im 100% sure that the Decamera folder name is correct and app key app secret correct so where is the problem i cannot find it

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Ghost Mjrm wrote:

... so where is the problem i cannot find it

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Ah..🙋 If that's fine for you, you can use it in such a way, of course. In such a case you can remove the "offline" declaration for the access type since you're not using it in fact. So big part of entire discussion seems meaningless - you don't need long term access since the posted cover your demands. 🙂 Ok, all done.

i have remove the offline access type and same problem successfully upload to dropbox but there is no nothing in the dropbox app

private void initiateDropboxAuthorization() {
    // Construct the Dropbox authorization URL
    String authorizationUrl = "https://www.dropbox.com/oauth2/authorize" +
            "?client_id=" + DROPBOX_APP_KEY +
            "&response_type=code" +
            "&state=myState" +  // Replace with your own state
            "&redirect_uri=" + DROPBOX_REDIRECT_URI;

    // Open the authorization URL in a web browser or WebView
    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(authorizationUrl));
    startActivity(browserIntent);
}