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Forum Discussion
xtremebytes
7 years agoExplorer | Level 3
Dropbox invalid redirect_uri, must be an absolute uri
My app (Xamarin Forms) used to work with the Dropbox API authorisation but now it is showing me an error "invalid redirect_uri, must be an absolute uri". This started happening, probably after I upgraded the Visual Studio/Xamarin nuget package for Dropbox.Api to 4.8.0 from 4.7.0. Absolutely, nothing else in the code for Dropbox authorisation was changed.
Yet, the non-local URLs I have for OAuth2 redirection on my app begin with "https://". What could have gone wrong?
@xtremebytes
This is the Xamarin Issue which causes the problem. Apparently work in progress:
[iOS] WebView.Source URL's are HTML encoded
Hope that helps.
- xtremebytesExplorer | Level 3
Digging in a bit deeper and looking at this code fragment:
this._oauth2State = Guid.NewGuid ().ToString ("N"); var authorizeUri = DropboxOAuth2Helper.GetAuthorizeUri (OAuthResponseType.Token, DropboxAppKey, RedirectUri, this._oauth2State, false, false, null, true); //force re-authenticate var webView = new WebView { Source = new UrlWebViewSource { Url = authorizeUri.AbsoluteUri } }; webView.Navigating += async (sender, e) => { if (!e.Url.StartsWith (RedirectUri, StringComparison.OrdinalIgnoreCase)) { // we need to ignore all navigation that isn't to the redirect uri. return;
the e.Url used to match the RedirectUri, and now it doesn't. Instead, the e.Url now contains the RedirectUri as a query string parameter as follows:
Is there something more that I am missing?
- xtremebytesExplorer | Level 3
Another note: the code is based on https://gist.github.com/tomcrusader/b0856a383bcdcf905c7a774c8c1b0879 -- and it used to work fine.
- xtremebytesExplorer | Level 3
Seems like there were some issues with the new Xamarin Forms upgrade, .net and PCL stuff, so I rolled back all packages upgrades including Dropbox and now things are working.
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