go/src/cmd/go/internal/auth/auth.go

var credentialCache …

var authOnce …

// AddCredentials populates the request header with the user's credentials
// as specified by the GOAUTH environment variable.
// It returns whether any matching credentials were found.
// req must use HTTPS or this function will panic.
func AddCredentials(req *http.Request) bool { … }

// runGoAuth executes authentication commands specified by the GOAUTH
// environment variable handling 'off', 'netrc', and 'git' methods specially,
// and storing retrieved credentials for future access.
func runGoAuth() { … }

// loadCredential retrieves cached credentials for the given url prefix and adds
// them to the request headers.
func loadCredential(req *http.Request, prefix string) bool { … }

// storeCredential caches or removes credentials (represented by HTTP headers)
// associated with given URL prefixes.
func storeCredential(prefixes []string, header http.Header) { … }