input {
    beats {
        host => "0.0.0.0"
        port => {{ .Port }}
    }
}

filter {
    mutate {
        # Remove some fields that are not needed.
        remove_field => [
            "[agent]",
            "[journald]",
            "[syslog]",
            "[systemd][invocation_id]",
            "[event][original]",
            "[log][offset]",
            "[log][syslog]"
        ]

        # Tag with the provided metadata.
        add_field => {
            {{ range $key, $value := .InfoMap }}
            "[metadata][{{ $key }}]" => "{{ $value }}"
            {{ end }}
        }
    }

    # Parse structured logs for following systemd units.
    if [systemd][unit] in ["bootstrapper.service", "constellation-bootstrapper.service"] {
        # skip_on_invalid_json below does not skip the whole filter, so let's use a cheap workaround here.
        # See:
        # https://discuss.elastic.co/t/skip-on-invalid-json-skipping-all-filters/215195
        # https://discuss.elastic.co/t/looking-for-a-way-to-detect-json/102263
        if [message] =~ "\A\{.+\}\z" {
            json {
                source => "message"
                target => "logs"
                skip_on_invalid_json => true
            }
            mutate {
                replace => {
                    "message" => "%{[logs][msg]}"
                }
                remove_field => [
                    "[logs][msg]",
                    "[logs][ts]"
                ]
            }
            de_dot {
                fields => ["[logs][peer.address]"]
            }
        }
    }
}

output {
    opensearch {
        hosts => "{{ .Host }}"
        index => "systemd-logs-%{+YYYY.MM.dd}"
        user => "{{ .Credentials.Username }}"
        password => "{{ .Credentials.Password }}"
        ssl => true
        ssl_certificate_verification => true
    }
}