Google drive integration wIth Business Central

 To integrate Google Drive into your AL (Business Central/NAV) code, you can use the Google Drive API and perform operations such as uploading files, downloading files, listing files, etc. Here's an example of how you can achieve this:

1. Set up the Google Drive API:

   - Create a project in the Google Cloud Console.

   - Enable the Google Drive API for the project.

   - Create credentials (OAuth client ID) to access the API.

2. Install the "Http Web Request" extension from Microsoft AppSource in your Business Central/NAV environment.

3. Create an AL codeunit or code snippet with the following functions:

```AL

codeunit GoogleDriveIntegration

{

    var

        HttpClient: DotNet "'System.Net.Http.HttpClient', 'System.Net.Http', Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a";

        HttpRequestMessage: DotNet "'System.Net.Http.HttpRequestMessage', 'System.Net.Http', Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a";

        HttpResponseMessage: DotNet "'System.Net.Http.HttpResponseMessage', 'System.Net.Http', Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a";

    procedure GetAccessToken(var AccessToken: Text)

    var

        AuthUrl: Text;

        ClientId: Text;

        ClientSecret: Text;

        RedirectUri: Text;

        TokenRequestUrl: Text;

        TokenResponse: Text;

        JsonObject: JsonObject;

    begin

        // Set your own values for the following variables:

        ClientId := 'YOUR_CLIENT_ID';

        ClientSecret := 'YOUR_CLIENT_SECRET';

        RedirectUri := 'YOUR_REDIRECT_URI';

        // Construct the authentication URL

        AuthUrl := 'https://accounts.google.com/o/oauth2/auth?';

        AuthUrl += 'response_type=code&';

        AuthUrl += 'client_id=' + UriEncode(ClientId) + '&';

        AuthUrl += 'redirect_uri=' + UriEncode(RedirectUri) + '&';

        AuthUrl += 'scope=https://www.googleapis.com/auth/drive';

        // Launch the authentication URL in a browser and retrieve the authorization code

        // Construct the token request URL

        TokenRequestUrl := 'https://www.googleapis.com/oauth2/v4/token';

        // Build the request body

        HttpRequestMessage := HttpRequestMessage.HttpMethodPost(TokenRequestUrl);

        HttpRequestMessage.Content().WriteFrom('code=' + UriEncode(AuthorizationCode) + '&');

        HttpRequestMessage.Content().WriteFrom('client_id=' + UriEncode(ClientId) + '&');

        HttpRequestMessage.Content().WriteFrom('client_secret=' + UriEncode(ClientSecret) + '&');

        HttpRequestMessage.Content().WriteFrom('redirect_uri=' + UriEncode(RedirectUri) + '&');

        HttpRequestMessage.Content().WriteFrom('grant_type=authorization_code');

        // Send the request and get the response

        HttpClient := HttpClient.HttpClient();

        HttpResponseMessage := HttpClient.Send(HttpRequestMessage);

        // Read the response content

        TokenResponse := HttpResponseMessage.Content().ReadAsString();

        // Parse the JSON response

        JsonObject := JsonObject.JsonObject(TokenResponse);

        AccessToken := JsonObject.GetValue('access_token').ToString();

    end;

    procedure UploadFile(var AccessToken: Text; var FilePath: Text)

    var

        UploadUrl: Text;

        FileName: Text;

        ResponseContent: Text;

    begin

        // Set the file name for the uploaded file

        FileName := 'MyFile.txt';

        // Construct the upload URL

        UploadUrl := 'https

://www.googleapis.com/upload/drive/v3/files?uploadType=media';

        // Build the request

        HttpRequestMessage := HttpRequestMessage.HttpMethodPost(UploadUrl);

        HttpRequestMessage.Headers().Add('Authorization', 'Bearer ' + AccessToken);

        HttpRequestMessage.Content().WriteFrom(FilePath);

        // Send the request and get the response

        HttpClient := HttpClient.HttpClient();

        HttpResponseMessage := HttpClient.Send(HttpRequestMessage);

        // Read the response content

        ResponseContent := HttpResponseMessage.Content().ReadAsString();

        // Process the response as needed

        // ...

    end;

    procedure DownloadFile(var AccessToken: Text; var FileId: Text)

    var

        DownloadUrl: Text;

        ResponseContent: Text;

    begin

        // Construct the download URL

        DownloadUrl := 'https://www.googleapis.com/drive/v3/files/' + FileId + '?alt=media';

        // Build the request

        HttpRequestMessage := HttpRequestMessage.HttpMethodGet(DownloadUrl);

        HttpRequestMessage.Headers().Add('Authorization', 'Bearer ' + AccessToken);

        // Send the request and get the response

        HttpClient := HttpClient.HttpClient();

        HttpResponseMessage := HttpClient.Send(HttpRequestMessage);

        // Read the response content

        ResponseContent := HttpResponseMessage.Content().ReadAsString();

        // Process the downloaded file content as needed

        // ...

    end;

}

```

Note: The above code assumes you have obtained the access token through the OAuth2 flow. You may need to implement the OAuth2 flow separately or modify the code to fit your specific authentication requirements.

Remember to replace placeholders like `'YOUR_CLIENT_ID'`, `'YOUR_CLIENT_SECRET'`, and `'YOUR_REDIRECT_URI'` with your actual values.

These code snippets demonstrate the basic functionality for uploading and downloading files. You can extend the code to perform additional operations like listing files, deleting files, creating folders, etc., by making appropriate API calls to the Google Drive API.

Please note that this is a simplified example, and in a real-world scenario, you may need to handle error cases, manage authentication tokens, and handle large file uploads/downloads more efficiently.

Make sure to test the code thoroughly and handle any potential exceptions or errors that may occur during the integration process.