Issue when authorizing

[ponnamkarthik]

E/flutter (11409): [ERROR:flutter/shell/common/shell.cc(184)] Dart Error: Unhandled exception:
E/flutter (11409): NoSuchMethodError: The getter 'length' was called on null.
E/flutter (11409): Receiver: null
E/flutter (11409): Tried calling: length
E/flutter (11409): #0      Object.noSuchMethod (dart:core/runtime/libobject_patch.dart:50:5)
E/flutter (11409): #1      _Uri._uriEncode (dart:core/runtime/liburi_patch.dart:44:23)
E/flutter (11409): #2      Uri.encodeComponent (dart:core/uri.dart:1060:17)
E/flutter (11409): #3      AuthorizationHeader._createSignature.<anonymous closure> (package:oauth1/src/authorization_header.dart:83:51)
E/flutter (11409): #4      __InternalLinkedHashMap&_HashVMBase&MapMixin&_LinkedHashMapMixin.forEach (dart:collection/runtime/libcompact_hash.dart:370:8)
E/flutter (11409): #5      AuthorizationHeader._createSignature (package:oauth1/src/authorization_header.dart:82:12)
E/flutter (11409): #6      AuthorizationHeader.toString (package:oauth1/src/authorization_header.dart:55:35)
E/flutter (11409): #7      Authorization.requestTokenCredentials (package:oauth1/src/authorization.dart:94:36)
E/flutter (11409): <asynchronous suspension>
E/flutter (11409): #8      _MyHomePageState.getTwitterAsync.<anonymous closure> (package:flitter/main.dart:70:19)
E/flutter (11409): #9      _RootZone.runUnary (dart:async/zone.dart:1379:54)
E/flutter (11409): #10     _FutureListener.handleValue (dart:async/future_impl.dart:129:18)
E/flutter (11409): #11     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:642:45)
E/flutter (11409): #12     Future._propagateToListeners (dart:async/future_impl.dart:671:32)
E/flutter (11409): #13     Future._complete (dart:async/future_impl.dart:476:7)
E/flutter (11409): #14     _SyncCompleter.complete (dart:async/future_impl.dart:51:12)
E/flutter (11409): #15     _AsyncAwaitCompleter.complete (dart:async/runtime/libasync_patch.dart:28:18)
E/flutter (11409): #16     _completeOnAsyncReturn (dart:async/runtime/libasync_patch.dart:295:13)
E/flutter (11409): #17     Authorization.requestTemporaryCredentials (package:oauth1/src/authorization.dart)
E/flutter (11409): <asynchronous suspension>
E/flutter (11409): #18     _MyHomePageState.getTwitterAsync (package:flitter/main.dart:60:10)
E/flutter (11409): #19     _MyHomePageState.initState (package:flitter/main.dart:38:5)
E/flutter (11409): #20     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3830:58)
E/flutter (11409): #21     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
E/flutter (11409): #22     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
E/flutter (11409): #23     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
E/flutter (11409): #24     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
E/flutter (11409): #25     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
E/flutter (11409): #26     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
E/flutter (11409): #27     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3732:16)
E/flutter (11409): #28     Element.rebuild (package:flutter/src/widgets/framework.dart:3547:5)
E/flutter (11409): #29     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3701:5)
E/flutter (11409): #30     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3696:5)
E/flutter (11409): #31     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
E/flutter (11409): #32     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
E/flutter (11409): #33     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
E/flutter (11409): #34     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
E/flutter (11409): #35     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
E/flutter (11409): #36     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
E/flutter (11409): #37     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
E/flutter (11409): #38     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
E/flutter (11409): #39     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
E/flutter (11409): #40     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
E/flutter (11409): #41     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
E/flutter (11409): #42     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4860:14)
E/flutter (11409): #43     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2950:14)
E/flutter (11409): #44     Element.updateChild (package:flutter/src/widgets/framework.dart:2753:12)
E/flutter (11409): #45     ComponentElement.perform

[kaetemi]

Thanks, will check. Any hints on reproducing?

[kaetemi]

Also, I recommend doing OAuth1 entirely server-side, just passing the result from getResourceOwnerAuthorizationURI to the app to show the authentication web page, and then passing the callback query back to the server.

For the callback url that contains the result query, for Twitter, use:

final oauth1.Platform platform = oauth1.Platform(
	provider.host + provider.requestTokenUrl,
	provider.host + provider.authenticateUrl,
	provider.host + provider.accessTokenUrl,
	oauth1.SignatureMethods.hmacSha1);
final oauth1.ClientCredentials clientCredentials = oauth1.ClientCredentials(
	provider.consumerKey, provider.consumerSecret);
final oauth1.Authorization oauth = oauth1.Authorization(
	clientCredentials, platform, httpClient);

final oauth1.Credentials credentials = oauth1.Credentials(
	query['oauth_token'],
	''); // oauth_token_secret can be left blank it seems
final oauth1.AuthorizationResponse authRes = await auth.requestTokenCredentials(
	credentials, query['oauth_verifier']);
oauthCredentials.token = authRes.credentials.token;
oauthCredentials.tokenSecret = authRes.credentials.tokenSecret;
oauthCredentials.tokenExpires = 0;
oauthCredentials.userId = authRes.optionalParameters['user_id'];

[ponnamkarthik]

To reproduce the issue just use the example code you kept in Readme.md file

[kaetemi]

The example code is using PIN based authentication, and command line input.

Using command line input may be what's failing for you under Flutter.

[kaetemi]

final oauth1.AuthorizationResponse authRes =
    await auth.requestTemporaryCredentials(provider.callbackUrl);
final String authUrl = auth
    .getResourceOwnerAuthorizationURI(authRes.credentials.token);

To get the regular auth url.