//nolint:testpackage // absent is what these wordings are read by
package ssh

import "testing"

// What a session says besides its report on the file that was asked
// for: sftp echoes the command it is running, and ssh warns about an
// identity file it cannot find in the words of a missing file even
// though the session goes on to authenticate.
const (
	echoed = `sftp> get .ssh/authorized_keys "/tmp/keyfunc/authorized_keys"
`
	warning = `Warning: Identity file /gone not accessible: ` +
		"No such file or directory.\n"
)

// TestAbsenceIsReadOnlyFromWhatSFTPSaidAboutAuthorizedKeys holds the
// wordings the OpenSSH client was seen to use against a real server:
// a file it cannot find is reported one way, naming the path the
// server expanded, and everything else it says is a failure.
func TestAbsenceIsReadOnlyFromWhatSFTPSaidAboutAuthorizedKeys(t *testing.T) {
	t.Parallel()

	sessions := map[string]struct {
		said string
		want bool
	}{
		"the file is not there": {
			said: echoed +
				`File "/home/someone/.ssh/authorized_keys" not found.` + "\n",
			want: true,
		},
		"the file is not there, named as it was asked for": {
			said: echoed + `File ".ssh/authorized_keys" not found.` + "\n",
			want: true,
		},
		"the file is not there and an identity file is not either": {
			said: warning + echoed +
				`File "/home/someone/.ssh/authorized_keys" not found.` + "\n",
			want: true,
		},
		"the file is there and cannot be read": {
			said: echoed +
				`remote open "/home/someone/.ssh/authorized_keys": ` +
				"Permission denied\n",
			want: false,
		},
		"only an identity file is not there": {
			said: warning + echoed +
				`remote open "/home/someone/.ssh/authorized_keys": ` +
				"Permission denied\n",
			want: false,
		},
		"some other file is not there": {
			said: echoed + `File "/home/someone/.ssh/known_hosts" not found.` +
				"\n",
			want: false,
		},
		"the connection did not come up": {
			said: "ssh: connect to host example.com port 22: " +
				"Connection refused\nConnection closed\n",
			want: false,
		},
	}

	for name, session := range sessions {
		t.Run(name, func(t *testing.T) {
			t.Parallel()

			if absent(session.said) != session.want {
				t.Errorf(
					"read as absent: %t, wanted %t, from:\n%s",
					!session.want, session.want, session.said,
				)
			}
		})
	}
}