allowing basic auth breaks oidc login for the client

[butonic]

Try connecting the desktop client to an ocis instance that has PROXY_ENABLE_BASIC_AUTH=true set.

The client will try to authenticate the token, sending a basic auth, leading to:

Anmeldefehler
Beim Zugriff auf den 'token' Endpunkt trat ein Fehler auf:
Der Host verlangt eine Authentifizierung

the ocis log shows

2021-05-28T14:30:12Z DBG dataprovider routing: path=/index.cs3/unique.github.com.owncloud.ocis.accounts.pkg.proto.v0.Account.Mail/xdxot13jkxym1b1qcencf2xdklaexmbfwit9j6efhhhfjhs2km9jbjtmf8jbxe69 pkg=rhttp service=storage traceid=ce738e48883194d48e3cbec46b6e3d80
2021-05-28T14:30:12Z DBG NodeFromPath() fn=/index.cs3/unique.github.com.owncloud.ocis.accounts.pkg.proto.v0.Account.Mail/xdxot13jkxym1b1qcencf2xdklaexmbfwit9j6efhhhfjhs2km9jbjtmf8jbxe69 pkg=rhttp service=storage traceid=ce738e48883194d48e3cbec46b6e3d80
2021-05-28T14:30:12Z DBG NodeFromPath() walk node={"BlobID":"","Blobsize":0,"Exists":true,"ID":"1ed4ae5d-23f3-42e2-814b-0dedf59afbe4","Name":"index.cs3","ParentID":"root"} pkg=rhttp service=storage traceid=ce738e48883194d48e3cbec46b6e3d80
2021-05-28T14:30:12Z DBG NodeFromPath() walk node={"BlobID":"","Blobsize":0,"Exists":true,"ID":"c442473d-3101-4717-8d74-1319c6897e45","Name":"unique.github.com.owncloud.ocis.accounts.pkg.proto.v0.Account.Mail","ParentID":"1ed4ae5d-23f3-42e2-814b-0dedf59afbe4"} pkg=rhttp service=storage traceid=ce738e48883194d48e3cbec46b6e3d80
2021-05-28T14:30:12Z DBG NodeFromPath() walk node={"BlobID":"","Blobsize":0,"Exists":false,"ID":"","Name":"xdxot13jkxym1b1qcencf2xdklaexmbfwit9j6efhhhfjhs2km9jbjtmf8jbxe69","ParentID":"c442473d-3101-4717-8d74-1319c6897e45"} pkg=rhttp service=storage traceid=ce738e48883194d48e3cbec46b6e3d80
2021-05-28T14:30:12Z DBG file not found error="error: not found: c442473d-3101-4717-8d74-1319c6897e45/xdxot13jkxym1b1qcencf2xdklaexmbfwit9j6efhhhfjhs2km9jbjtmf8jbxe69" action=stat handler=download pkg=rhttp service=storage svc=datatx traceid=ce738e48883194d48e3cbec46b6e3d80
2021-05-28T14:30:12Z WRN http end="28/May/2021:14:30:12 +0000" host=127.0.0.1 method=GET pkg=rhttp proto=HTTP/1.1 service=storage size=0 start="28/May/2021:14:30:12 +0000" status=404 time_ns=1348700 traceid=ce738e48883194d48e3cbec46b6e3d80 uri=/data/index.cs3/unique.github.com.owncloud.ocis.accounts.pkg.proto.v0.Account.Mail/xdxot13jkxym1b1qcencf2xdklaexmbfwit9j6efhhhfjhs2km9jbjtmf8jbxe69 url=/data/index.cs3/unique.github.com.owncloud.ocis.accounts.pkg.proto.v0.Account.Mail/xdxot13jkxym1b1qcencf2xdklaexmbfwit9j6efhhhfjhs2km9jbjtmf8jbxe69
2021-05-28T14:30:12Z ERR error fetching from accounts-service error="{\"id\":\"com.owncloud.api.accounts\",\"code\":401,\"detail\":\"account not found or invalid credentials\",\"status\":\"Unauthorized\"}" query="login eq 'xdXOt13JKxym1B1QcEncf2XDkLAexMBFwiT9j6EfhhHFJhs2KM9jbjTmf8JBXE69' and password eq 'UBntmLjC2yYCeHwsyj73Uwo9TAaecAetRwMw0xYcvNL9yRdLSUi0hUAHfvCHFeFh'" service=proxy

the problem is caused by the fallback chain that tries to authenticate the basic auth credentials with the accounts service.