Perl

Dropbox: OAuth2 Authorization to Obtain an Access Token

See more Dropbox Examples

Demonstrates how to get a Dropbox OAuth2 access token from a desktop application or script.

This example runs the OAuth 2.0 authorization flow that lets the user sign in to Dropbox and authorize your app.

Perl

use chilkat();

$success = 0;

# For more information about the OAuth2, see OAuth 2.0 Authorization Flow

$oauth2 = chilkat::CkOAuth2->new();

# The port should match the Authorized Redirect URL in your Dropbox app, 
# which would look like "http://localhost:3017/"
$oauth2->put_ListenPort(3017);

# IMPORTANT: One of the OAuth2 redirect URIs for your Dropbox app must be
# exactly this string:  http://localhost:3017/

$oauth2->put_AuthorizationEndpoint("https://www.dropbox.com/oauth2/authorize");
$oauth2->put_TokenEndpoint("https://api.dropboxapi.com/oauth2/token");

# Replace this with your actual Dropbox App Key
$oauth2->put_ClientId("DROPBOX_APP_KEY");

# This is for Require Proof Key for Code Exchange (PKCE)
# See OAuth2 PKCE Explained
$oauth2->put_CodeChallenge(1);
$oauth2->put_CodeChallengeMethod("S256");

# Add token_access_type=offline to also get a refresh token in the response
$oauth2->AddAuthQueryParam("token_access_type","offline");

# Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
$url = $oauth2->startAuth();
if ($oauth2->get_LastMethodSuccess() != 1) {
    print $oauth2->lastErrorText() . "\r\n";
    exit;
}

print "url = " . $url . "\r\n";

# Launch the default browser on the system and navigate to the url.
# The LaunchBrowser method was added in Chilkat v10.1.2.
$success = $oauth2->LaunchBrowser($url);
if ($success == 0) {
    print $oauth2->lastErrorText() . "\r\n";
    exit;
}

# Wait for the user to approve or deny authorization in the browser.
$numMsWaited = 0;
while (($numMsWaited < 90000) and ($oauth2->get_AuthFlowState() < 3)) {
    $oauth2->SleepMs(100);
    $numMsWaited = $numMsWaited + 100;
}

# If the browser does not respond within the specified time, AuthFlowState will be:
# 
# 1: Waiting for Redirect - The OAuth2 background thread is waiting for the browser's redirect request.
# 2: Waiting for Final Response - The thread is awaiting the final access token response.
# In either case, cancel the background task initiated by StartAuth.

if ($oauth2->get_AuthFlowState() < 3) {
    $oauth2->Cancel();
    print "No response from the browser!" . "\r\n";
    exit;
}

# Check AuthFlowState to determine if authorization was granted, denied, or failed:
# 
# 3: Success - OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
# 4: Access Denied - OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
# 5: Failure - OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

if ($oauth2->get_AuthFlowState() == 5) {
    print "OAuth2 failed to complete." . "\r\n";
    print $oauth2->failureInfo() . "\r\n";
    exit;
}

if ($oauth2->get_AuthFlowState() == 4) {
    print "OAuth2 authorization was denied." . "\r\n";
    print $oauth2->accessTokenResponse() . "\r\n";
    exit;
}

if ($oauth2->get_AuthFlowState() != 3) {
    print "Unexpected AuthFlowState:" . $oauth2->get_AuthFlowState() . "\r\n";
    exit;
}

print "OAuth2 authorization granted!" . "\r\n";

$json = chilkat::CkJsonObject->new();
$json->Load($oauth2->accessTokenResponse());
$json->put_EmitCompact(0);

print "Access Token Response = " . $json->emit() . "\r\n";

# A sample access token response:

# {
#   "access_token": "...",
#   "token_type": "bearer",
#   "expires_in": 14399,
#   "refresh_token": "...",
#   "scope": "account_info.read",
#   "uid": "562542581",
#   "account_id": "dbid:AACQhDS0E3_Vb72Ynd0F-GxGWdTI2qcTHzA"
# }

print "Access Token = " . $oauth2->accessToken() . "\r\n";

# Save the JSON access token response to a file for subsequent use..
$json->WriteFile("qa_data/tokens/dropbox.json");