Salesforce Oauth redirect CORS issue node express app

问题

I've tried everything to get around the CORS error I am receiving. For oauth flow, to redirect your app to the Salesforce login screen (but this url auto redirects behind the scenes from salesforce to salesforce)

XMLHttpRequest cannot load salesforce url 2 Redirect from salesforce url 1 to salesforce oauth url 2 has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3000' is therefore not allowed access.

I've installed CORS module and also tried this:

app.use('/public',function(req, res, next) {
res.setHeader("Access-Control-Allow-Origin", "*");
// Request headers you wish to allow
res.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested- 
With, Content-Type, Accept");     
// Set to true if you need the website to include cookies in the  
requests sent   
res.setHeader('Access-Control-Allow-Credentials', true);
// Pass to next layer of middleware
next();
});

Can anyone actually get this working and help?

回答1:

I just wrote a blog couple of days back: http://nodexperts.com/blog/salesforce-oauth-using-nodejs/

First of all, this will help you a lot in setting up OAuth2 and SalesForce in your Node-Express app.

Another thing is that you can go from your app -> SalesForce login app -> your_redirect_uri.

You will only get CORS error when you're doing this from server-to-server.

So, if you have an app which has some UI and some user interaction, then I would suggest you to redirect to SalesForce page from your client code.

Here's a snippet of how you can redirect to login page of Salesforce using express roure and jsforce npom package:

app.get('/oauth2/auth', function(req, res) {
  const oauth2 = new jsforce.OAuth2({
    clientId: process.env.CLIENT_ID,
    clientSecret: process.env.CLIENT_SECRET_ID,
    redirectUri: `${req.protocol}://${req.get('host')}/${process.env.REDIRECT_URI}`
  });
  res.redirect(oauth2.getAuthorizationUrl({}));
});

And this is how you can set your SalesForce conncted app, redirect url:

app.get('/redirect_uri', function(req,res) {
  const oauth2 = new jsforce.OAuth2({
    clientId: process.env.CLIENT_ID,
    clientSecret: process.env.CLIENT_SECRET_ID,
    redirectUri: `${req.protocol}://${req.get('host')}/${process.env.REDIRECT_URI}`
  });
  const conn = new jsforce.Connection({ oauth2 : oauth2 });

  conn.authorize(req.query.code, function(err, userInfo) {
    if (err) {
      return console.error(err);
    }
    console.log(conn.accessToken);
  });
});

Hope, everything is clear, let me know in case of any clarification.

来源：https://stackoverflow.com/questions/43150587/salesforce-oauth-redirect-cors-issue-node-express-app

标签

node.js

api

express

cors

salesforce