I found changes in OAuth2 for API, so the authorization could be done with offline access, ascuirung both Access and Refresh tokens. This part is OK, with ProcessCodeFlow method in SDK. But could not find any method to refresh access token using saved refresh token.
Can you please help me with this case?
The Dropbox .NET SDK should automatically do the refresh for you, on every client creation and API call as needed.
If you do want to explicitly refresh though, e.g., to get an access token with fewer scopes, you should be able to use RefreshAccessToken to do so, as shown in the example here.
Let us know if something isn't working as expected though.
I understand, the Dropbox client can automatically refresh the refresh tokens if fed with the correct access token and refresh token.
But how can I retrieve the actual new access token and refresh token, to store it, for new instances of the DropboxClient?
@OFV The Dropbox client in the SDK can and will automatically handle the refresh for you, and you shouldn't even need to access to refresh token or new access token after a refresh. The refresh token doesn't change, and the client will automatically set its new access token. And if you need another client, you can just create it like you did originally and let the client handle the refresh again if needed.
Greg, I still can't get it to work for a duration longer than the access token's validity.
(this part works:)
I ask for user authentication (only once) using the DropboxOAuth2Helper.GetAuthorizeUri with OAuthResponseType.Code and TokenAccessType.Offline.
The resulting POST http request gives me a code and DropboxOAuth2Helper.ProcessCodeFlowAsync provides me an access token and refresh token based on that code. The tokens are persisted in the DB and to be used for longer periods (months) without the user needing to re-login
(this part fails:)
The DropboxClient is instantiated with the Access_token and refresh token retrieved in the first part.
Using the DropboxClient.Files.ListFolderAsync it works for a while (a few hours after initial usser auth), but the next day it fails with "Dropbox.Api.AuthException: expired_access_token/"
It concerns an MVC webapp, and the dropboxclient is newly instantiated on every use.
I thought the DropboxClient would do "it's thing" using the initial access and refresh tokens.
(I am using the Official Dropbox .Net v2 SDK v5.5.0 Nuget package)
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