(Node.js) OneDrive -- Streaming REST Download to File

Downloads the contents of a DriveItem directly to a file in the local filesystem using the Chilkat REST class.

Note: This example requires Chilkat v9.5.0.69 or greater.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node11-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node11-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node11-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node11-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node11-linux64');
    }
} else if (os.platform() == 'darwin') {
    var chilkat = require('@chilkat/ck-node11-macosx');
}

function chilkatExample() {

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

    var rest = new chilkat.Rest();

    // Use your previously obtained access token here:
    // See the following examples for getting an access token:
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD v2.0 Endpoint).
    //    Get Microsoft Graph OAuth2 Access Token (Azure AD Endpoint).
    //    Refresh Access Token (Azure AD v2.0 Endpoint).
    //    Refresh Access Token (Azure AD Endpoint).

    // First connect to graph.microsoft.com.  If there's a connectivity problem, we'll find out here.
    var success = rest.Connect("graph.microsoft.com",443,true,true);
    if (success !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    // (Make sure your token was obtained with the FilesRead or Files.ReadWrite scope.)
    var oauth2 = new chilkat.OAuth2();
    oauth2.AccessToken = "MICROSOFT_GRAPH_ACCESS_TOKEN";
    rest.SetAuthOAuth2(oauth2);

    // Send the GET request to download the file.
    var uriPath = "/v1.0/me/drive/root:/Misc/wildlife/penguins.jpg:/content";
    success = rest.SendReqNoBody("GET",uriPath);
    if (rest.LastMethodSuccess !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    // NOTE: This way of doing the HTTP GET (i.e. download) may be more cumbersome, but it 
    // allows for finer control of handling errors.  The connection establishment, the sending of the
    // request, the reading of the response header, and the reading of the response body (i.e. the file data)
    // are handled by separate method calls.  If the response header indicates an error, we can read
    // the response body and treat it differently than if reading the file data.

    // Read the response header.
    var statusCode = rest.ReadResponseHeader();
    console.log("Response Status Code = " + statusCode);
    if (statusCode == 302) {
        // This is a redirect.  Read the response body, if any, and then follow the redirect.
        // Usually the response body will be empty for a redirect, but we need to be sure to read
        // the response body just in case it exists.
        var discard = new chilkat.BinData();
        rest.ReadRespBd(discard);
        rest.Disconnect(10);

        // For OneDrive, the redirect URL does not need authorization because the only way
        // to have obtained the direct download URL is from an authenticated request.
        // In fact, if we leave the authentication present, the GET request to the redirect URL will fail.

        // Note: The ClearAuth method is introduced in v9.5.0.69.
        rest.ClearAuth();

        // Follow the redirect URL...
        // redirectUrl: Url
        var redirectUrl = rest.RedirectUrl();
        console.log("Redirect Host: " + redirectUrl.Host);
        console.log("Redirect URI Path: " + redirectUrl.PathWithQueryParams);

        success = rest.Connect(redirectUrl.Host,redirectUrl.Port,redirectUrl.Ssl,true);
        if (success !== true) {
            console.log(rest.LastErrorText);
            return;
        }

        // Send the request..
        success = rest.SendReqNoBody("GET",redirectUrl.Path);

        if (rest.LastMethodSuccess !== true) {
            console.log(rest.LastErrorText);
            return;
        }

        statusCode = rest.ReadResponseHeader();
        console.log(rest.LastErrorText);
        console.log("Redirect Response Status Code = " + statusCode);

    }

    if (statusCode >= 300) {

        // Read the error response body.
        var sbJson = new chilkat.StringBuilder();
        success = rest.ReadRespSb(sbJson);
        if (success !== true) {
            console.log(rest.LastErrorText);
            return;
        }

        var jsonErr = new chilkat.JsonObject();
        jsonErr.EmitCompact = false;
        jsonErr.LoadSb(sbJson);
        console.log(jsonErr.Emit());

        return;
    }

    // Stream the response body directly to a local file.
    var localPath = "qa_output/penguins.jpg";

    var stream = new chilkat.Stream();
    stream.SinkFile = localPath;

    success = rest.ReadRespBodyStream(stream,true);
    if (success !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    console.log("Successfully streamed a OneDrive file to the local filesystem.");

}

chilkatExample();