Tcl Requires Chilkat v10.1.2+

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.

Tcl

load ./chilkat.dll

set success 0

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

set oauth2 [new_CkOAuth2]

#  The port should match the Authorized Redirect URL in your Dropbox app, 
#  which would look like "http://localhost:3017/"
CkOAuth2_put_ListenPort $oauth2 3017

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

CkOAuth2_put_AuthorizationEndpoint $oauth2 "https://www.dropbox.com/oauth2/authorize"
CkOAuth2_put_TokenEndpoint $oauth2 "https://api.dropboxapi.com/oauth2/token"

#  Replace this with your actual Dropbox App Key
CkOAuth2_put_ClientId $oauth2 "DROPBOX_APP_KEY"

#  This is for Require Proof Key for Code Exchange (PKCE)
#  See OAuth2 PKCE Explained
CkOAuth2_put_CodeChallenge $oauth2 1
CkOAuth2_put_CodeChallengeMethod $oauth2 "S256"

#  Add token_access_type=offline to also get a refresh token in the response
CkOAuth2_AddAuthQueryParam $oauth2 "token_access_type" "offline"

#  Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
set url [CkOAuth2_startAuth $oauth2]
if {[CkOAuth2_get_LastMethodSuccess $oauth2] == 0} then {
    puts [CkOAuth2_lastErrorText $oauth2]
    delete_CkOAuth2 $oauth2
    exit
}

puts "url = $url"

#  Launch the default browser on the system and navigate to the url.
#  The LaunchBrowser method was added in Chilkat v10.1.2.
set success [CkOAuth2_LaunchBrowser $oauth2 $url]
if {$success == 0} then {
    puts [CkOAuth2_lastErrorText $oauth2]
    delete_CkOAuth2 $oauth2
    exit
}

#  Wait for the user to approve or deny authorization in the browser.
set numMsWaited 0
while {expr [$numMsWaited < 90000]  &&  [[CkOAuth2_get_AuthFlowState $oauth2] < 3]} {
    CkOAuth2_SleepMs $oauth2 100
    set numMsWaited [expr $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 {[CkOAuth2_get_AuthFlowState $oauth2] < 3} then {
    CkOAuth2_Cancel $oauth2
    puts "No response from the browser!"
    delete_CkOAuth2 $oauth2
    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 {[CkOAuth2_get_AuthFlowState $oauth2] == 5} then {
    puts "OAuth2 failed to complete."
    puts [CkOAuth2_failureInfo $oauth2]
    delete_CkOAuth2 $oauth2
    exit
}

if {[CkOAuth2_get_AuthFlowState $oauth2] == 4} then {
    puts "OAuth2 authorization was denied."
    puts [CkOAuth2_accessTokenResponse $oauth2]
    delete_CkOAuth2 $oauth2
    exit
}

if {[CkOAuth2_get_AuthFlowState $oauth2] != 3} then {
    puts "Unexpected AuthFlowState:[CkOAuth2_get_AuthFlowState $oauth2]"
    delete_CkOAuth2 $oauth2
    exit
}

puts "OAuth2 authorization granted!"

set json [new_CkJsonObject]

CkJsonObject_Load $json [CkOAuth2_accessTokenResponse $oauth2]
CkJsonObject_put_EmitCompact $json 0

puts "Access Token Response = [CkJsonObject_emit $json]"

#  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"
#  }

puts "Access Token = [CkOAuth2_accessToken $oauth2]"

#  Save the JSON access token response to a file for subsequent use..
CkJsonObject_WriteFile $json "qa_data/tokens/dropbox.json"

delete_CkOAuth2 $oauth2
delete_CkJsonObject $json