Lianja Requires Chilkat v10.1.2+
Dynamics CRM OAuth2 Access Token

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

//  To further clarify, see OAuth 2.0 Authorization Flow

loOauth2 = createobject("CkOAuth2")

//  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.
loOauth2.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
loOauth2.AuthorizationEndpoint = "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/authorize"
loOauth2.TokenEndpoint = "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token"

//  Replace these with actual values.
loOauth2.ClientId = "DYNAMICS-CRM-CLIENT-ID"
loOauth2.ClientSecret = "DYNAMICS-CRM-SECRET-KEY"

loOauth2.Resource = "https://mydynamicsdomain.api.crm.dynamics.com"

loOauth2.RedirectAllowHtml = "<html><body><p>Thank you for granting access.</p></bod></html>"
loOauth2.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.
lcUrl = loOauth2.StartAuth()
if (loOauth2.LastMethodSuccess <> .T.) then
    ? loOauth2.LastErrorText
    release loOauth2
    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.
loHttp = createobject("CkHttp")
loSbPreCheck = createobject("CkStringBuilder")
llSuccess = loHttp.QuickGetSb(lcUrl,loSbPreCheck)
if ((loHttp.LastStatus <> 200) or (loSbPreCheck.StartsWith("{",.T.) <> .T.)) then
    ? "JSON Error Response:"
    ? loSbPreCheck.GetAsString()
    release loOauth2
    release loHttp
    release loSbPreCheck
    return
endif

//  If the HTTP request itself failed, then examine the error.
if (llSuccess = .F.) then
    ? loHttp.LastErrorText
    release loOauth2
    release loHttp
    release loSbPreCheck
    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.
llSuccess = loOauth2.LaunchBrowser(lcUrl)
if (llSuccess = .F.) then
    ? loOauth2.LastErrorText
    release loOauth2
    release loHttp
    release loSbPreCheck
    return
endif

//  Wait for the user to approve or deny authorization in the browser.
lnNumMsWaited = 0
do while (lnNumMsWaited < 90000) and (loOauth2.AuthFlowState < 3)
    loOauth2.SleepMs(100)
    lnNumMsWaited = lnNumMsWaited + 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 (loOauth2.AuthFlowState < 3) then
    loOauth2.Cancel()
    ? "No response from the browser!"
    release loOauth2
    release loHttp
    release loSbPreCheck
    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 (loOauth2.AuthFlowState = 5) then
    ? "OAuth2 failed to complete."
    ? loOauth2.FailureInfo
    release loOauth2
    release loHttp
    release loSbPreCheck
    return
endif

if (loOauth2.AuthFlowState = 4) then
    ? "OAuth2 authorization was denied."
    ? loOauth2.AccessTokenResponse
    release loOauth2
    release loHttp
    release loSbPreCheck
    return
endif

if (loOauth2.AuthFlowState <> 3) then
    ? "Unexpected AuthFlowState:" + str(loOauth2.AuthFlowState)
    release loOauth2
    release loHttp
    release loSbPreCheck
    return
endif

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

//  Get the full JSON response:
loJson = createobject("CkJsonObject")
loJson.Load(loOauth2.AccessTokenResponse)
loJson.EmitCompact = .F.

//  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 (loJson.HasMember("expires_on") <> .T.) then
    loDtExpire = createobject("CkDateTime")
    loDtExpire.SetFromCurrentSystemTime()
    loDtExpire.AddSeconds(loJson.IntOf("expires_in"))
    loJson.AppendString("expires_on",loDtExpire.GetAsUnixTimeStr(.F.))
endif

? loJson.Emit()

//  Save the JSON to a file for future requests.
loFac = createobject("CkFileAccess")
loFac.WriteEntireTextFile("qa_data/tokens/dynamicsCrm.json",loJson.Emit(),"utf-8",.F.)


release loOauth2
release loHttp
release loSbPreCheck
release loJson
release loDtExpire
release loFac