Swift
Dynamics CRM OAuth2 Access Token

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

Swift

func chilkatTest() {
    var success: Bool = false

    // To further clarify, see OAuth 2.0 Authorization Flow

    let oauth2 = CkoOAuth2()!

    // 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.
    oauth2.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
    oauth2.authorizationEndpoint = "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/authorize"
    oauth2.tokenEndpoint = "https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token"

    // Replace these with actual values.
    oauth2.clientId = "DYNAMICS-CRM-CLIENT-ID"
    oauth2.clientSecret = "DYNAMICS-CRM-SECRET-KEY"

    oauth2.resource = "https://mydynamicsdomain.api.crm.dynamics.com"

    oauth2.redirectAllowHtml = "<html><body><p>Thank you for granting access.</p></bod></html>"
    oauth2.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.
    var url: String? = oauth2.startAuth()
    if oauth2.lastMethodSuccess != true {
        print("\(oauth2.lastErrorText!)")
        return
    }

    // 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.
    let http = CkoHttp()!
    let sbPreCheck = CkoStringBuilder()!
    success = http.quickGetSb(url: url, sbContent: sbPreCheck)
    if (http.lastStatus.intValue != 200) || (sbPreCheck.starts(with: "{", caseSensitive: true) != true) {
        print("JSON Error Response:")
        print("\(sbPreCheck.getAsString()!)")
        return
    }

    // If the HTTP request itself failed, then examine the error.
    if success == false {
        print("\(http.lastErrorText!)")
        return
    }

    // 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.
    success = oauth2.launchBrowser(url: url)
    if success == false {
        print("\(oauth2.lastErrorText!)")
        return
    }

    // Wait for the user to approve or deny authorization in the browser.
    var numMsWaited: Int = 0
    while (numMsWaited < 90000) && (oauth2.authFlowState.intValue < 3) {
        oauth2.sleepMs(millisec: 100)
        numMsWaited = numMsWaited + 100
    }

    // 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 oauth2.authFlowState.intValue < 3 {
        oauth2.cancel()
        print("No response from the browser!")
        return
    }

    // 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 oauth2.authFlowState.intValue == 5 {
        print("OAuth2 failed to complete.")
        print("\(oauth2.failureInfo!)")
        return
    }

    if oauth2.authFlowState.intValue == 4 {
        print("OAuth2 authorization was denied.")
        print("\(oauth2.accessTokenResponse!)")
        return
    }

    if oauth2.authFlowState.intValue != 3 {
        print("Unexpected AuthFlowState:\(oauth2.authFlowState.intValue)")
        return
    }

    print("OAuth2 authorization granted!")
    print("Access Token = \(oauth2.accessToken!)")

    // Get the full JSON response:
    let json = CkoJsonObject()!
    json.load(json: oauth2.accessTokenResponse)
    json.emitCompact = false

    // 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 json.hasMember(jsonPath: "expires_on") != true {
        let dtExpire = CkoDateTime()!
        dtExpire.setFromCurrentSystemTime()
        dtExpire.addSeconds(numSeconds: json.int(of: "expires_in").intValue)
        json.appendString(name: "expires_on", value: dtExpire.get(asUnixTimeStr: false))
    }

    print("\(json.emit()!)")

    // Save the JSON to a file for future requests.
    let fac = CkoFileAccess()!
    fac.writeEntireTextFile(path: "qa_data/tokens/dynamicsCrm.json", fileData: json.emit(), charset: "utf-8", includePreamble: false)

}