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

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.

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func chilkatTest() {
    // 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.

    let json = CkoJsonObject()!
    json.update("client_secret", value: "CLIENT_SECRET")
    json.update("client_id", value: "CLIENT_ID")
    json.update("token_endpoint", value: "https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token")
    json.update("scope", value: "https://graph.microsoft.com/.default")

    let http = CkoHttp()!

    // Provide the information to let Chilkat automatically obtain the access token.
    http.authToken = json.emit()

    let sbResponse = CkoStringBuilder()!

    var success: Bool = http.quickGetSb("https://graph.microsoft.com/v1.0/users", sbContent: sbResponse)
    if success != true {
        print("\(http.lastErrorText!)")
        return
    }

    json.loadSb(sbResponse)
    json.emitCompact = false

    print("Status code = \(http.lastStatus.intValue)")
    if http.lastStatus.intValue != 200 {
        print("\(json.emit()!)")
        print("Failed.")
    }

    print("\(json.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

    var odata_id: String?
    var displayName: String?
    var givenName: String?
    var jobTitle: String?
    var mail: String?
    var mobilePhone: String?
    var officeLocation: String?
    var preferredLanguage: String?
    var surname: String?
    var userPrincipalName: String?
    var id: String?
    var j: Int
    var count_j: Int

    var odata_context: String? = json.string(of: "\"@odata.context\"")
    var i: Int = 0
    var count_i: Int = json.size(ofArray: "value").intValue
    while i < count_i {
        json.i = i
        odata_id = json.string(of: "value[i].\"@odata.id\"")
        displayName = json.string(of: "value[i].displayName")
        givenName = json.string(of: "value[i].givenName")
        jobTitle = json.string(of: "value[i].jobTitle")
        mail = json.string(of: "value[i].mail")
        mobilePhone = json.string(of: "value[i].mobilePhone")
        officeLocation = json.string(of: "value[i].officeLocation")
        preferredLanguage = json.string(of: "value[i].preferredLanguage")
        surname = json.string(of: "value[i].surname")
        userPrincipalName = json.string(of: "value[i].userPrincipalName")
        id = json.string(of: "value[i].id")
        j = 0
        count_j = json.size(ofArray: "value[i].businessPhones").intValue
        while j < count_j {
            json.j = j
            j = j + 1
        }

        i = i + 1
    }


}