Can make the collector use token auth

[julojulox]

Hi together,
I really cant get this work and I would appreciate your help. I have collector v145 with following yaml config (snip below)

extensions:

ZPages for internal debugging

zpages:
endpoint: 0.0.0.0:55679

OAuth2 authentication (client-secret flow)

oauth2client/cc_auth:
client_id_file: ./client_id_file
client_secret_file: ./client_secret_file
token_url: "/oauth/token"

However in logs I see
failed to get security token from token endpoint (endpoint "/oauth/token"); invalid key: Key must be a PEM encoded PKCS1 or PKCS8 key", "interval": "11.112083153s"}
It looks like its still pulling the cert auth instead of client secret. The client ID and secret have special characters like $ or | . Though I could not identify if this is a problem when stored in file and if yes how to overcome it. I tried everything, running out of ideas :/

When I print-config I see something stored in certificate_key but cant find out where it does come from.

extensions:
oauth2client/cc_auth:
client_certificate_key: '[REDACTED]'
client_certificate_key_file: ""
client_certificate_key_id: ""
client_id:
client_id_file: ""
client_secret: '[REDACTED]'
client_secret_file: ""
endpoint_params: {}
expiry_buffer: 5m0s

Any help is highly appreciated. Thx

[wl2027]

@julojulox try 146+ , where client_credentials was incorrectly routed to the JWT bearer path and could cause client_secret_file to be treated like a private key; fixed in #45787