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Xbase++ Requires Chilkat v10.1.2+

Dynamics CRM OAuth2 Access Token

See more OAuth2 Examples

Demonstrates how to get a Microsoft Dynamics CRM OAuth2 access token from a desktop (installed) application or script.

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LOCAL nSuccess
LOCAL oOauth2
LOCAL cUrl
LOCAL oHttp
LOCAL oSbPreCheck
LOCAL nNumMsWaited
LOCAL oJson
LOCAL oDtExpire
LOCAL oFac

nSuccess := 0

//  To further clarify, see OAuth 2.0 Authorization Flow

oOauth2 := CreateObject("Chilkat.OAuth2")

//  This should be the port in the localhost redirect URL for your app.
//  Important: Make sure the redirect URI in your Azure app registration 
//  is exactly "http://localhost:3017/".  Don't forget the ending "/" char.
//  The redirect URL would look like "http://localhost:3017/" if the port number is 3017.
oOauth2:ListenPort := 3017

//  Get the endpoints from the Azure Portal in the "endpoints" section of App Registrations..
//  The DYNAMICS-ENDPOINT-GUID is a Tenant dynamics-endpoint-guid  such as 1b54e7ee-d61b-4f12-a621-a6b2805b98c2
oOauth2:AuthorizationEndpoint := "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/authorize"
oOauth2:TokenEndpoint := "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token"

//  Replace these with actual values.
oOauth2:ClientId := "DYNAMICS-CRM-CLIENT-ID"
oOauth2:ClientSecret := "DYNAMICS-CRM-SECRET-KEY"

oOauth2:Resource := "https://mydynamicsdomain.api.crm.dynamics.com"

oOauth2:RedirectAllowHtml := "<html><body><p>Thank you for granting access.</p></bod></html>"
oOauth2:RedirectDenyHtml := "<html><body><p>Maybe next time...</p></bod></html>"

//  Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
cUrl := oOauth2:StartAuth()
IF (oOauth2:LastMethodSuccess != 1)
    ? oOauth2:LastErrorText
    oOauth2:destroy()
    RETURN
ENDIF

//  We can pre-check the URL by sending a GET to catch any up-front errors.
//  If we receive JSON with an error in response, then we don't proceed any farther.

//  If we receive an HTML response, and the response status = 200, then all should be OK.
//  We can proceed by displaying an interactive browser loaded with the url.
oHttp := CreateObject("Chilkat.Http")
oSbPreCheck := CreateObject("Chilkat.StringBuilder")
nSuccess := oHttp:QuickGetSb(cUrl, oSbPreCheck)
IF ((oHttp:LastStatus != 200) .OR. (oSbPreCheck:StartsWith("{", 1) != 1))
    ? "JSON Error Response:"
    ? oSbPreCheck:GetAsString()
    oOauth2:destroy()
    oHttp:destroy()
    oSbPreCheck:destroy()
    RETURN
ENDIF

//  If the HTTP request itself failed, then examine the error.
IF (nSuccess == 0)
    ? oHttp:LastErrorText
    oOauth2:destroy()
    oHttp:destroy()
    oSbPreCheck:destroy()
    RETURN
ENDIF

//  OK.. the pre-flight check seems OK, go ahead with getting the interactive user authorization..

//  Launch the default browser on the system and navigate to the url.
//  The LaunchBrowser method was added in Chilkat v10.1.2.
nSuccess := oOauth2:LaunchBrowser(cUrl)
IF (nSuccess == 0)
    ? oOauth2:LastErrorText
    oOauth2:destroy()
    oHttp:destroy()
    oSbPreCheck:destroy()
    RETURN
ENDIF

//  Wait for the user to approve or deny authorization in the browser.
nNumMsWaited := 0
DO WHILE (nNumMsWaited < 90000) .AND. (oOauth2:AuthFlowState < 3)
    oOauth2:SleepMs(100)
    nNumMsWaited := nNumMsWaited + 100
ENDDO

//  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 (oOauth2:AuthFlowState < 3)
    oOauth2:Cancel()
    ? "No response from the browser!"
    oOauth2:destroy()
    oHttp:destroy()
    oSbPreCheck:destroy()
    RETURN
ENDIF

//  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 (oOauth2:AuthFlowState == 5)
    ? "OAuth2 failed to complete."
    ? oOauth2:FailureInfo
    oOauth2:destroy()
    oHttp:destroy()
    oSbPreCheck:destroy()
    RETURN
ENDIF

IF (oOauth2:AuthFlowState == 4)
    ? "OAuth2 authorization was denied."
    ? oOauth2:AccessTokenResponse
    oOauth2:destroy()
    oHttp:destroy()
    oSbPreCheck:destroy()
    RETURN
ENDIF

IF (oOauth2:AuthFlowState != 3)
    ? "Unexpected AuthFlowState:" + Str(oOauth2:AuthFlowState)
    oOauth2:destroy()
    oHttp:destroy()
    oSbPreCheck:destroy()
    RETURN
ENDIF

? "OAuth2 authorization granted!"
? "Access Token = " + oOauth2:AccessToken

//  Get the full JSON response:
oJson := CreateObject("Chilkat.JsonObject")
oJson:Load(oOauth2:AccessTokenResponse)
oJson:EmitCompact := 0

//  The JSON response looks like this:

//  {
//    "token_type": "Bearer",
//    "scope": "user_impersonation",
//    "expires_in": "3599",
//    "ext_expires_in": "0",
//    "expires_on": "1524783438",
//    "not_before": "1524779538",
//    "resource": "https://mydomain.api.crm.dynamics.com",
//    "access_token": "...",
//    "refresh_token": "...",
//    "id_token": "..."
//  }

//  If an "expires_on" member does not exist, then add the JSON member by
//  getting the current system date/time and adding the "expires_in" seconds.
//  This way we'll know when the token expires.
IF (oJson:HasMember("expires_on") != 1)
    oDtExpire := CreateObject("Chilkat.CkDateTime")
    oDtExpire:SetFromCurrentSystemTime()
    oDtExpire:AddSeconds(oJson:IntOf("expires_in"))
    oJson:AppendString("expires_on", oDtExpire:GetAsUnixTimeStr(0))
ENDIF

? oJson:Emit()

//  Save the JSON to a file for future requests.
oFac := CreateObject("Chilkat.FileAccess")
oFac:WriteEntireTextFile("qa_data/tokens/dynamicsCrm.json", oJson:Emit(), "utf-8", 0)

oOauth2:destroy()
oHttp:destroy()
oSbPreCheck:destroy()
oJson:destroy()
oDtExpire:destroy()
oFac:destroy()