Xbase++

Microsoft Graph -- List Users (Automatic OAuth2 Client Credentials)

See more Microsoft Graph Examples

Simplify OAuth2 client credentials by using Chilkat to automatically obtain the necessary access token. This example demonstrates the technique with the Microsoft Graph API's "List Users" request. Xbase++

LOCAL nSuccess
LOCAL oJson
LOCAL oHttp
LOCAL oSbResponse
LOCAL cOdata_id
LOCAL cDisplayName
LOCAL cGivenName
LOCAL cJobTitle
LOCAL cMail
LOCAL cMobilePhone
LOCAL cOfficeLocation
LOCAL cPreferredLanguage
LOCAL cSurname
LOCAL cUserPrincipalName
LOCAL cId
LOCAL j
LOCAL nCount_j
LOCAL cOdata_context
LOCAL i
LOCAL nCount_i

nSuccess := 0

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

//  Instead of directly sending a POST request to obtain an OAuth2 access token, 
//  you can provide Chilkat with the necessary information to automatically fetch 
//  the token using the Client Credentials flow. During the first HTTP request, 
//  Chilkat will obtain the token if it doesn't have one yet, and then use it for 
//  all subsequent requests. When the token is expired or about to expire, Chilkat 
//  will automatically obtain a new one, eliminating the need for your application 
//  to manage token expiration and renewal manually. This approach also reduces the 
//  number of HTTP requests by utilizing valid tokens as long as possible.

oJson := CreateObject("Chilkat.JsonObject")
oJson:UpdateString("client_secret", "CLIENT_SECRET")
oJson:UpdateString("client_id", "CLIENT_ID")
oJson:UpdateString("token_endpoint", "https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token")
oJson:UpdateString("scope", "https://graph.microsoft.com/.default")

oHttp := CreateObject("Chilkat.Http")

//  Provide the information to let Chilkat automatically obtain the access token.
oHttp:AuthToken := oJson:Emit()

oSbResponse := CreateObject("Chilkat.StringBuilder")

nSuccess := oHttp:QuickGetSb("https://graph.microsoft.com/v1.0/users", oSbResponse)
IF (nSuccess != 1)
    ? oHttp:LastErrorText
    oJson:destroy()
    oHttp:destroy()
    oSbResponse:destroy()
    RETURN
ENDIF

oJson:LoadSb(oSbResponse)
oJson:EmitCompact := 0

? "Status code = " + Str(oHttp:LastStatus)
IF (oHttp:LastStatus != 200)
    ? oJson:Emit()
    ? "Failed."
ENDIF

? oJson:Emit()

//  Sample output
//  {
//    "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users",
//    "value": [
//      {
//        "@odata.id": "https://graph.microsoft.com/v2/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/directoryObjects/fca490d8-5918-4201-8079-c5dcbeafcdc9/Microsoft.DirectoryServices.User",
//        "businessPhones": [
//        ],
//        "displayName": "Joe Sample",
//        "givenName": "Joe",
//        "jobTitle": null,
//        "mail": null,
//        "mobilePhone": null,
//        "officeLocation": null,
//        "preferredLanguage": null,
//        "surname": "Sample",
//        "userPrincipalName": "admin_chilkatsoft.com#EXT#@adminchilkatsoft.onmicrosoft.com",
//        "id": "fca490d8-5918-4201-8079-c5dcbeafcdc9"
//      }
//    ]
//  }

//  Use this online tool to generate parsing code from sample JSON: 
//  Generate Parsing Code from JSON

cOdata_context := oJson:StringOf('"@odata.context"')
i := 0
nCount_i := oJson:SizeOfArray("value")
DO WHILE i < nCount_i
    oJson:I := i
    cOdata_id := oJson:StringOf('value[i]."@odata.id"')
    cDisplayName := oJson:StringOf("value[i].displayName")
    cGivenName := oJson:StringOf("value[i].givenName")
    cJobTitle := oJson:StringOf("value[i].jobTitle")
    cMail := oJson:StringOf("value[i].mail")
    cMobilePhone := oJson:StringOf("value[i].mobilePhone")
    cOfficeLocation := oJson:StringOf("value[i].officeLocation")
    cPreferredLanguage := oJson:StringOf("value[i].preferredLanguage")
    cSurname := oJson:StringOf("value[i].surname")
    cUserPrincipalName := oJson:StringOf("value[i].userPrincipalName")
    cId := oJson:StringOf("value[i].id")
    j := 0
    nCount_j := oJson:SizeOfArray("value[i].businessPhones")
    DO WHILE j < nCount_j
        oJson:J := j
        j := j + 1
    ENDDO
    i := i + 1
ENDDO

oJson:destroy()
oHttp:destroy()
oSbResponse:destroy()