(Go) Microsoft Graph OAuth2 Client Credentials Grant Flow

Demonstrates how to get a Microsoft Graph access token using the Client Credentials Grant Flow.

You can use the OAuth 2.0 client credentials grant specified in RFC 6749, sometimes called two-legged OAuth, to access web-hosted resources by using the identity of an application. This type of grant is commonly used for server-to-server interactions that must run in the background, without immediate interaction with a user. These types of applications are often referred to as daemons or service accounts.

For more information, see https://docs.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow

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

    http := chilkat.NewHttp()

    req := chilkat.NewHttpRequest()
    req.AddParam("client_secret","CLIENT_SECRET")
    req.AddParam("client_id","CLIENT_ID")
    // Don't know if the scopes valid for the client credentials grant are different than the scopes for the 3-legged Authorization Code Grant...
    req.AddParam("scope","https://graph.microsoft.com/.default")
    req.AddParam("grant_type","client_credentials")

    // Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd
    url := "https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token"
    resp := http.PostUrlEncoded(url,req)
    if http.LastMethodSuccess() != true {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        req.DisposeHttpRequest()
        return
    }

    statusCode := resp.StatusCode()
    fmt.Println("Response status code = ", statusCode)

    json := chilkat.NewJsonObject()
    json.Load(resp.BodyStr())
    resp.DisposeHttpResponse()

    json.SetEmitCompact(false)
    fmt.Println(*json.Emit())

    // Sample successful output:

    // {
    //   "token_type": "Bearer",
    //   "expires_in": 3599,
    //   "ext_expires_in": 3599,
    //   "access_token": "eyJ0eX...K0jOERg"
    // }

    if statusCode == 200 {
        json.WriteFile("qa_data/tokens/msGraphClientCredentialsToken.json")
        fmt.Println("Success.")
    }
    else {
        fmt.Println("Failed.")
    }


    http.DisposeHttp()
    req.DisposeHttpRequest()
    json.DisposeJsonObject()