For example site: aside.io, when we click Sandbox login, it takes you to test.salesforce.com and then when you enter your user name and password it authenticates and redirects to the aside.io with the classes and other files from that org?
While creating my own apex editor I was reading the USerName and password+security token via properties file. But now I have to implement the login screen same as what aside.io does.
What resources should I read to achieve this? Does aside.io store the username and password? Or how do they download and the files and deploy the files ? I suspect it through cookies? Is there any example i can follow?