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package httpcaddyfile
import (
"regexp"
"strings"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
)
type ComplexShorthandReplacer struct {
search *regexp.Regexp
replace string
}
type ShorthandReplacer struct {
complex []ComplexShorthandReplacer
simple *strings.Replacer
}
func NewShorthandReplacer() ShorthandReplacer {
// replace shorthand placeholders (which are convenient
// when writing a Caddyfile) with their actual placeholder
// identifiers or variable names
replacer := strings.NewReplacer(placeholderShorthands()...)
// these are placeholders that allow a user-defined final
// parameters, but we still want to provide a shorthand
// for those, so we use a regexp to replace
regexpReplacements := []ComplexShorthandReplacer{
{regexp.MustCompile(`{header\.([\w-]*)}`), "{http.request.header.$1}"},
{regexp.MustCompile(`{cookie\.([\w-]*)}`), "{http.request.cookie.$1}"},
{regexp.MustCompile(`{labels\.([\w-]*)}`), "{http.request.host.labels.$1}"},
{regexp.MustCompile(`{path\.([\w-]*)}`), "{http.request.uri.path.$1}"},
{regexp.MustCompile(`{file\.([\w-]*)}`), "{http.request.uri.path.file.$1}"},
{regexp.MustCompile(`{query\.([\w-]*)}`), "{http.request.uri.query.$1}"},
{regexp.MustCompile(`{re\.([\w-]*)\.([\w-]*)}`), "{http.regexp.$1.$2}"},
{regexp.MustCompile(`{vars\.([\w-]*)}`), "{http.vars.$1}"},
{regexp.MustCompile(`{rp\.([\w-\.]*)}`), "{http.reverse_proxy.$1}"},
{regexp.MustCompile(`{err\.([\w-\.]*)}`), "{http.error.$1}"},
{regexp.MustCompile(`{file_match\.([\w-]*)}`), "{http.matchers.file.$1}"},
}
return ShorthandReplacer{
complex: regexpReplacements,
simple: replacer,
}
}
// placeholderShorthands returns a slice of old-new string pairs,
// where the left of the pair is a placeholder shorthand that may
// be used in the Caddyfile, and the right is the replacement.
func placeholderShorthands() []string {
return []string{
"{dir}", "{http.request.uri.path.dir}",
"{file}", "{http.request.uri.path.file}",
"{host}", "{http.request.host}",
"{hostport}", "{http.request.hostport}",
"{port}", "{http.request.port}",
"{method}", "{http.request.method}",
"{path}", "{http.request.uri.path}",
"{query}", "{http.request.uri.query}",
"{remote}", "{http.request.remote}",
"{remote_host}", "{http.request.remote.host}",
"{remote_port}", "{http.request.remote.port}",
"{scheme}", "{http.request.scheme}",
"{uri}", "{http.request.uri}",
"{uuid}", "{http.request.uuid}",
"{tls_cipher}", "{http.request.tls.cipher_suite}",
"{tls_version}", "{http.request.tls.version}",
"{tls_client_fingerprint}", "{http.request.tls.client.fingerprint}",
"{tls_client_issuer}", "{http.request.tls.client.issuer}",
"{tls_client_serial}", "{http.request.tls.client.serial}",
"{tls_client_subject}", "{http.request.tls.client.subject}",
"{tls_client_certificate_pem}", "{http.request.tls.client.certificate_pem}",
"{tls_client_certificate_der_base64}", "{http.request.tls.client.certificate_der_base64}",
"{upstream_hostport}", "{http.reverse_proxy.upstream.hostport}",
"{client_ip}", "{http.vars.client_ip}",
}
}
// ApplyToSegment replaces shorthand placeholder to its full placeholder, understandable by Caddy.
func (s ShorthandReplacer) ApplyToSegment(segment *caddyfile.Segment) {
if segment != nil {
for i := 0; i < len(*segment); i++ {
// simple string replacements
(*segment)[i].Text = s.simple.Replace((*segment)[i].Text)
// complex regexp replacements
for _, r := range s.complex {
(*segment)[i].Text = r.search.ReplaceAllString((*segment)[i].Text, r.replace)
}
}
}
}
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