Cannot exchange AccessToken from Google API inside Docker container

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Cannot exchange AccessToken from Google API inside Docker container



I have a web app written in Go, use oauth2 (package golang.org/x/oauth2) to sign user in by Google (follow this tutorial https://developers.google.com/identity/sign-in/web/server-side-flow).


golang.org/x/oauth2



When I test app on local, it works fine but when I deploy app and run inside a Docker container (base on golang:alpine), it has an error:
Post https://accounts.google.com/o/oauth2/token: x509: certificate signed by unknown authority


Post https://accounts.google.com/o/oauth2/token: x509: certificate signed by unknown authority



Here is my code to exchange the accessToken:


ctx = context.Background()

config := &oauth2.Config
ClientID: config.GoogleClientId,
ClientSecret: config.GoogleClientSecret,
RedirectURL: config.GoogleLoginRedirectUrl,
Endpoint: google.Endpoint,
Scopes: string"email", "profile",


accessToken, err := config.Exchange(ctx, req.Code)
if err != nil
log.Println(err.Error()) // Error here




1 Answer
1



You will need to add the Google Issuing CA certificate to the trusted cert store of the docker image.



The Google CA cert is this https://pki.google.com/GIAG2.crt .



More info on the certificate can be found from here



Then within the Dockerfile , you will need to do something like this


cp GIAG2.crt /usr/local/share/ca-certificates/GIAG2.crt
update-ca-certificates






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