I was trying to download the file from azure data lake storage. it's working on c# side using Rest API. but it's not working in a java script.
My Sample c# code is
//Get Access Token
public DataLakeAccessToken ServiceAuth(string tenatId, string clientid, string clientsecret)
{
var authtokenurl = string.Format("https://login.microsoftonline.com/{0}/oauth2/token", tenatId);
using (var client = new HttpClient())
{
var model = new List<KeyValuePair<string, string>>()
{
new KeyValuePair<string, string>("grant_type","client_credentials"),
new KeyValuePair<string, string>("resource","https://management.core.windows.net/"),//Bearer
new KeyValuePair<string, string>("client_id",clientid),
new KeyValuePair<string, string>("client_secret",clientsecret),
};
var content = new FormUrlEncodedContent(model);
HttpResponseMessage response = client.PostAsync(authtokenurl, content).Result;
if (response.StatusCode == System.Net.HttpStatusCode.OK)
{
var accessToken = JsonConvert.DeserializeObject<DataLakeAccessToken>(response.Content.ReadAsStringAsync().Result);
return accessToken;
}
else
{
return null;
}
}
}
File Download Code is
public void DownloadFile(string srcFilePath, ref string destFilePath)
{
int i = 0;
var folderpath = Path.GetDirectoryName(destFilePath);
var filename = Path.GetFileNameWithoutExtension(destFilePath);
var extenstion = Path.GetExtension(destFilePath);
Increment:
var isfileExist = File.Exists(destFilePath);
if (isfileExist)
{
i++;
destFilePath = folderpath+filename + "_" + i + "_" + extenstion;
goto Increment;
}
string DownloadUrl = "https://{0}.azuredatalakestore.net/webhdfs/v1/{1}?op=OPEN&read=true";
var fullurl = string.Format(DownloadUrl, _datalakeAccountName, srcFilePath);
using (var client = new HttpClient())
{
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", _accesstoken.access_token);
using (var formData = new MultipartFormDataContent())
{
var response = client.GetAsync(fullurl).Result;
using (var fs = new FileStream(destFilePath, FileMode.Create, FileAccess.Write, FileShare.None))
{
response.Content.CopyToAsync(fs).Wait();
}
}
}
}
first i was Generate the token using client credentials and the token based download file using path example https://mydatalaksestore.azuredatalaksestore.net/myfolder/myfile i pass myfolder/myfile in source path and destFilePath file name based download the file
in javascript i was get the accesstoken from my api server and send the request for mydatalakestore it's throw error for cross orgin for localhost:8085 like this
Any one know how to download the datalake store file using Javascript from Client Side using Access Token without cross orgin error
Thanks in Advance
