Oauth 2.0

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import { ArcGISIdentityManager } from "@esri/arcgis-rest-request";

// register your own app to create a unique clientId
const clientId = "abc123"

// send the user to the authorization page
ArcGISIdentityManager.beginOAuth2({
  clientId,
  redirectUri: 'https://yourapp.com/authenticate.html'
})
  .then(authenticationManager => {
    console.log(authenticationManager)
  });

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import { ArcGISIdentityManager } from "@esri/arcgis-rest-request";

const clientId = "abc123"

/**
 * after the user authorizes the application they will be redirected to
 * the page defined in redirectUri which will need to complete the
 * authentication process.
 **/
ArcGISIdentityManager.completeOAuth2({
  clientId,
  redirectUri: 'https://yourapp.com/authenticate.html'
});

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  const clientID = "YOUR_CLIENT_ID";
  let accessToken;
  const callbacks = [];
  const protocol = window.location.protocol;
  const callbackPage = protocol + "./oauth-callback.html";

  function oauth(callback) {
        if (accessToken) {
          callback(accessToken);
        } else {
          callbacks.push(callback);
          window.open(
            "https://www.arcgis.com/sharing/oauth2/authorize?client_id=" +
              clientID +
              "&response_type=token&expiration=20160&redirect_uri=" +
              window.encodeURIComponent(callbackPage),
            "oauth",
            "height=400,width=600,menubar=no,location=yes,resizable=yes,scrollbars=yes,status=yes"
          );
        }
      }

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/* Once the user is authorized, the access token must be retrieved.*/
let match;
  if (window.location.hash && (match = window.location.hash.match(/#access_token=([^&]+)/))) {
    if (window.opener && window.opener.parent) {
      window.opener.parent.oauthCallback(match[1]);
    } else {
      window.parent.oauthCallback(match[1]);
    }
    window.close();
  }