Visual FoxPro

Square OAuth2 Access Token

See more Square Examples

Demonstrates how to get an access token for the Square API. This example is for desktop apps only (not web apps). Visual FoxPro

LOCAL lnSuccess
LOCAL loOauth2
LOCAL lcUrl
LOCAL loSbUrl
LOCAL lnNumMsWaited
LOCAL loJson
LOCAL loFac

lnSuccess = 0

* This example requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

loOauth2 = CreateObject('Chilkat.OAuth2')

* This should be the port in the localhost callback URL for your app.  
* The callback URL would look like "http://localhost:3017/" if the port number is 3017.
loOauth2.ListenPort = 3017

* To use the production system, change the domains here to "connect.squareup.com"
loOauth2.AuthorizationEndpoint = "https://connect.squareupsandbox.com/oauth2/authorize"
loOauth2.TokenEndpoint = "https://connect.squareupsandbox.com/oauth2/token"

* Replace these with actual values.
loOauth2.ClientId = "APPLICATION_ID"
loOauth2.ClientSecret = "APPLICATION_SECRET"

* Make sure to include the scopes you'll need.
loOauth2.Scope = "ITEMS_WRITE ITEMS_READ"

* Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
lcUrl = loOauth2.StartAuth()
IF (loOauth2.LastMethodSuccess = 0) THEN
    ? loOauth2.LastErrorText
    RELEASE loOauth2
    CANCEL
ENDIF

* Add the session=False query param to the URL.
loSbUrl = CreateObject('Chilkat.StringBuilder')
loSbUrl.Append(lcUrl)
loSbUrl.Append("&session=False")
* Launch this URL in the browser.
lcUrl = loSbUrl.GetAsString()

* Launch the system's default browser navigated to the URL.
lnSuccess = loOauth2.LaunchBrowser(lcUrl)
IF (lnSuccess = 0) THEN
    ? loOauth2.LastErrorText
    RELEASE loOauth2
    RELEASE loSbUrl
    CANCEL
ENDIF

* Now wait for the authorization.
* We'll wait for a max of 30 seconds.
lnNumMsWaited = 0
DO WHILE (lnNumMsWaited < 30000) AND (loOauth2.AuthFlowState < 3)
    loOauth2.SleepMs(100)
    lnNumMsWaited = lnNumMsWaited + 100
ENDDO

* If there was no response from the browser within 30 seconds, then 
* the AuthFlowState will be equal to 1 or 2.
* 1: Waiting for Redirect. The OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
* 2: Waiting for Final Response. The OAuth2 background thread is waiting for the final access token response.
* In that case, cancel the background task started in the call to StartAuth.
IF (loOauth2.AuthFlowState < 3) THEN
    loOauth2.Cancel()
    ? "No response from the browser!"
    RELEASE loOauth2
    RELEASE loSbUrl
    CANCEL
ENDIF

* Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
* The possible AuthFlowState values are:
* 3: Completed with Success. The OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
* 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
* 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
IF (loOauth2.AuthFlowState = 5) THEN
    ? "OAuth2 failed to complete."
    ? loOauth2.FailureInfo
    RELEASE loOauth2
    RELEASE loSbUrl
    CANCEL
ENDIF

IF (loOauth2.AuthFlowState = 4) THEN
    ? "OAuth2 authorization was denied."
    ? loOauth2.AccessTokenResponse
    RELEASE loOauth2
    RELEASE loSbUrl
    CANCEL
ENDIF

IF (loOauth2.AuthFlowState <> 3) THEN
    ? "Unexpected AuthFlowState:" + STR(loOauth2.AuthFlowState)
    RELEASE loOauth2
    RELEASE loSbUrl
    CANCEL
ENDIF

? "OAuth2 authorization granted!"
? "Access Token = " + loOauth2.AccessToken

* Get the full JSON response:
loJson = CreateObject('Chilkat.JsonObject')
loJson.Load(loOauth2.AccessTokenResponse)
loJson.EmitCompact = 0

* The JSON response looks like this:

* {
*   "access_token": "EAAAE...depV",
*   "token_type": "bearer",
*   "expires_at": "2020-09-04T23:30:18Z",
*   "merchant_id": "MLQA83866KSR5",
*   "refresh_token": "EQAAEE...jeVfD6MV"
* }

? loJson.Emit()

* Save the JSON to a file for future requests.
loFac = CreateObject('Chilkat.FileAccess')
loFac.WriteEntireTextFile("qa_data/tokens/square.json",loJson.Emit(),"utf-8",0)

RELEASE loOauth2
RELEASE loSbUrl
RELEASE loJson
RELEASE loFac