Auto Login Dropbox account on Core Api without Login Prompt

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The Dropbox API was designed with the intention that each user would link their own Dropbox account, in order to interact with their own files. However, it is technically possible to connect to just one account. The SDKs don’t offer explicit support for it and we don’t recommend doing so, for various technical and security reasons.

However if you did want to go this route, instead of kicking off the authorization flow, you would manually use an existing access token for your app. (Just be careful not to revoke it, e.g. via https://www.dropbox.com/account/security .) In the iOS Core SDK you’d need to use:

- (void)updateAccessToken:(NSString *)token accessTokenSecret:(NSString *)secret forUserId:(NSString *)userId;

Again though, this isn’t a good idea. Since this would be a client-side app, any malicious user of your app could extract the access token and use it to bypass any access restrictions your app attempted to enforce. For example, they could access content they shouldn’t or add or replace content with a malicious payload that other users would access.

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