Salesforce OAuth with REST API using Javascript

问题

I have an app in my salesforce developer account that I want to allow my users to access from a remote app that I am building. I see that I must use OAuth2.0 to first authorize my users before they are allowed to access the salesforce data. At the moment I am trying to use the username-password OAuth flow described on salesforce.

Step 1) I request access token using username and password via the below code snippet

var password = 'userPassword' + 'securityToken'
$.ajax({
    type: 'GET',
    url: 'https://login.salesforce.com/services/oauth2/token',
    contentType: 'application/json',
    dataType: 'json',
    beforeSend: function(xhr) {
        xhr.setRequestHeader('grant_type','password'),
        xhr.setRequestHeader('client_id',  '<client_id_here>'),
        xhr.setRequestHeader('client_secret', '<client_secret_here'),
        xhr.setRequestHeader('username', 'username@location.com'),
        xhr.setRequestHeader('password', "password")
    },
    success: function(response) {
        console.log('Successfully retrieved ' + response);
        //Other logic here
    },
    error: function(response) {
        console.log('Failed ' + response.status + ' ' + response.statusText);
        //Other logic here
    }
});

My request, however, is failing with the following message:

1) OPTIONS https://login.salesforce.com/services/oauth2/token 400 (Bad Request) 

2) XMLHttpRequest cannot load https://login.salesforce.com/services/oauth2/token. No 
  'Access- Control-Allow-Origin' header is present on the requested resource. 
   Origin   http://localhost is therefore not allowed access.

I have seen some sources (here here here) mention that CORS is not supported in salesforce, and that another solution should be used. Some solutions I have seen are Salesforce APEX code, AJAX toolkit, or ForceTK.

In summary, I am looking to see if (1) there is a simple mistake that I am making with my above request to get the OAuth access_token (2) or if I need to do something different to get the access (3) is there a better way to login users and access their salesforce data from my connected app?

All and any help is appreciated!

回答1:

You will need to handle the OAUTH part on your own server. This isn't just due to lack of CORS, there is also no way to securely OAUTH purely on the client-side. The server could really be anything but here is an example server written in Java using Play Framework which has a JavaScript / AngularJS client as well: http://typesafe.com/activator/template/reactive-salesforce-rest-javascript-seed

回答2:

You can not make this request from JavaScript. You'll need to make a server side request. There are many implementations of this flow in PHP, C#, Java, etc.

回答3:

I'm posting my ajax code here that has worked for me and this CORS error in console doesn't matter. If you see in network you will get the access token. see the ajax code below.

function gettoken()
{
    var param = {
      grant_type: "password",
      client_id : "id here",
      client_secret : "seceret here ",
      username:"username",
      password:"password with full key provided by sf"};
$.ajax({
    url: 'https://test.salesforce.com/services/oauth2/token',
    type: 'POST',
    data: param,
    dataType: "json",
    contentType: "application/x-www-form-urlencoded",
    success: function (data) {
        alert(data);
    }

});
}

I hope this will work for you perfectly.

来源：https://stackoverflow.com/questions/25021482/salesforce-oauth-with-rest-api-using-javascript

标签

javascript

ajax

rest

oauth

salesforce