OAuth operates like Tesla's “Valet Mode”. The Tesla Owner gives the valet limited access to his/her Tesla without needing to provide the main vehicle key.
You likely have profiles on dozens of applications containing personal information. Originally siloed, these applications have become increasingly connected. Discord searches Facebook for suggested friends, Jira creates user accounts with Github profiles, and so on. This trend of applications talking to each other on your behalf is called “Delegated Access” and has become a necessary part of our online lives.
However, because of the way these applications protect their data, developers run into a challenge: how do we delegate access? Almost every application is protected by a basic username/password schema. To allow Application A to get the data it needs from Application B would require constantly logging into Application B on behalf of Application A — how unwieldy! The workaround was to give Application A the username and password credentials to log in to Application B, which was problematic for a few reasons:
OAuth was formed as a solution to this Catch-22 situation: how to provide delegated access without putting the end user’s data at risk.
Consider that Teslas have a “Valet Mode” for which you need a valet keycard. This keycard informs the vehicle that it is to operate with limited functionality, restricting the max speed and acceleration and locking the trunk. This technique is conceptually identical to how OAuth operates. The Tesla Owner gives the valet limited access to his/her Tesla without needing to provide the main vehicle key.
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