Node.js

Download File from Dropbox (Streaming)

See more Dropbox Examples

Downloads a file from Dropbox, streaming it directly to a file in the filesystem. Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

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

    //  A Dropbox access token should have been previously obtained.
    //  Dropbox access tokens do not expire.
    //  See Dropbox Access Token.

    var rest = new chilkat.Rest();

    //  Connect to Dropbox
    success = rest.Connect("content.dropboxapi.com",443,true,true);
    if (success == false) {
        console.log(rest.LastErrorText);
        return;
    }

    //  Add request headers.
    rest.AddHeader("Authorization","Bearer DROPBOX_ACCESS_TOKEN");

    //  The download "parameters" are contained in JSON passed in an HTTP request header.
    //  This is the JSON indicating the file to be downloaded:
    //  { 
    //     "path": "/Homework/lit/hamlet.xml",
    //  }

    var json = new chilkat.JsonObject();
    json.AppendString("path","/Homework/lit/hamlet.xml");
    rest.AddHeader("Dropbox-API-Arg",json.Emit());

    //  Setup a file stream for the download
    var fileStream = new chilkat.Stream();
    fileStream.SinkFile = "qa_output/hamletFromDropbox.xml";

    //  Indicate that the call to FullRequestNoBody should send the response body
    //  to fileStream if the response status code is 200.
    //  If a non-success response status code is received, then nothing
    //  is streamed to the output file and the error response is returned by FullRequestNoBody.
    var expectedStatus = 200;
    rest.SetResponseBodyStream(expectedStatus,true,fileStream);

    var responseStr = rest.FullRequestNoBody("POST","/2/files/download");
    if (rest.LastMethodSuccess == false) {
        console.log(rest.LastErrorText);
        return;
    }

    //  When successful, Dropbox responds with a 200 response code.
    if (rest.ResponseStatusCode !== 200) {
        //  Examine the request/response to see what happened.
        console.log("response status code = " + rest.ResponseStatusCode);
        console.log("response status text = " + rest.ResponseStatusText);
        console.log("response header: " + rest.ResponseHeader);
        console.log("response body (if any): " + responseStr);
        console.log("---");
        console.log("LastRequestStartLine: " + rest.LastRequestStartLine);
        console.log("LastRequestHeader: " + rest.LastRequestHeader);
        return;
    }

    //  Information about the downloaded file is also available as JSON in a response header.
    //  The "dropbox-api-result" response header contains the information.  For example:
    var apiResult = rest.ResponseHdrByName("dropbox-api-result");
    console.log(apiResult);

    //  In this case, the pretty-formatted dropbox-api-result JSON looks like this:
    //  { 
    //    "name": "hamlet.xml",
    //    "path_lower": "/homework/lit/hamlet.xml",
    //    "path_display": "/Homework/lit/hamlet.xml",
    //    "id": "id:74FkdeNuyKAAAAAAAAAAAQ",
    //    "client_modified": "2016-06-02T23:19:00Z",
    //    "server_modified": "2016-06-02T23:19:00Z",
    //    "rev": "9482db15f",
    //    "size": 279658
    //  }

    //  Load the JSON, pretty-print it, and demonstrate how to get some values...
    var jsonResult = new chilkat.JsonObject();
    jsonResult.EmitCompact = false;
    jsonResult.Load(apiResult);
    //  Show the JSON pretty-printed...
    console.log(jsonResult.Emit());

    //  Sample code to get data from the JSON response:
    var size = jsonResult.IntOf("size");
    console.log("size = " + size);

    var rev = jsonResult.StringOf("rev");
    console.log("rev = " + rev);

    var clientModified = jsonResult.StringOf("client_modified");
    var ckdt = new chilkat.CkDateTime();
    ckdt.SetFromTimestamp(clientModified);
    var bLocalTime = true;
    var dt = new chilkat.DtObj();
    ckdt.ToDtObj(bLocalTime,dt);

    console.log(dt.Day + "/" + dt.Month + "/" + dt.Year + " " + dt.Hour + ":" + dt.Minute);

}

chilkatExample();