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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package caddyfile
import (
"regexp"
"strconv"
"strings"
"go.uber.org/zap"
"github.com/caddyserver/caddy/v2"
)
// parseVariadic determines if the token is a variadic placeholder,
// and if so, determines the index range (start/end) of args to use.
// Returns a boolean signaling whether a variadic placeholder was found,
// and the start and end indices.
func parseVariadic(token Token, argCount int) (bool, int, int) {
if !strings.HasPrefix(token.Text, "{args[") {
return false, 0, 0
}
if !strings.HasSuffix(token.Text, "]}") {
return false, 0, 0
}
argRange := strings.TrimSuffix(strings.TrimPrefix(token.Text, "{args["), "]}")
if argRange == "" {
caddy.Log().Named("caddyfile").Warn(
"Placeholder "+token.Text+" cannot have an empty index",
zap.String("file", token.File+":"+strconv.Itoa(token.Line)), zap.Strings("import_chain", token.imports))
return false, 0, 0
}
start, end, found := strings.Cut(argRange, ":")
// If no ":" delimiter is found, this is not a variadic.
// The replacer will pick this up.
if !found {
return false, 0, 0
}
// A valid token may contain several placeholders, and
// they may be separated by ":". It's not variadic.
// https://github.com/caddyserver/caddy/issues/5716
if strings.Contains(start, "}") || strings.Contains(end, "{") {
return false, 0, 0
}
var (
startIndex = 0
endIndex = argCount
err error
)
if start != "" {
startIndex, err = strconv.Atoi(start)
if err != nil {
caddy.Log().Named("caddyfile").Warn(
"Variadic placeholder "+token.Text+" has an invalid start index",
zap.String("file", token.File+":"+strconv.Itoa(token.Line)), zap.Strings("import_chain", token.imports))
return false, 0, 0
}
}
if end != "" {
endIndex, err = strconv.Atoi(end)
if err != nil {
caddy.Log().Named("caddyfile").Warn(
"Variadic placeholder "+token.Text+" has an invalid end index",
zap.String("file", token.File+":"+strconv.Itoa(token.Line)), zap.Strings("import_chain", token.imports))
return false, 0, 0
}
}
// bound check
if startIndex < 0 || startIndex > endIndex || endIndex > argCount {
caddy.Log().Named("caddyfile").Warn(
"Variadic placeholder "+token.Text+" indices are out of bounds, only "+strconv.Itoa(argCount)+" argument(s) exist",
zap.String("file", token.File+":"+strconv.Itoa(token.Line)), zap.Strings("import_chain", token.imports))
return false, 0, 0
}
return true, startIndex, endIndex
}
// makeArgsReplacer prepares a Replacer which can replace
// non-variadic args placeholders in imported tokens.
func makeArgsReplacer(args []string) *caddy.Replacer {
repl := caddy.NewEmptyReplacer()
repl.Map(func(key string) (any, bool) {
// TODO: Remove the deprecated {args.*} placeholder
// support at some point in the future
if matches := argsRegexpIndexDeprecated.FindStringSubmatch(key); len(matches) > 0 {
// What's matched may be a substring of the key
if matches[0] != key {
return nil, false
}
value, err := strconv.Atoi(matches[1])
if err != nil {
caddy.Log().Named("caddyfile").Warn(
"Placeholder {args." + matches[1] + "} has an invalid index")
return nil, false
}
if value >= len(args) {
caddy.Log().Named("caddyfile").Warn(
"Placeholder {args." + matches[1] + "} index is out of bounds, only " + strconv.Itoa(len(args)) + " argument(s) exist")
return nil, false
}
caddy.Log().Named("caddyfile").Warn(
"Placeholder {args." + matches[1] + "} deprecated, use {args[" + matches[1] + "]} instead")
return args[value], true
}
// Handle args[*] form
if matches := argsRegexpIndex.FindStringSubmatch(key); len(matches) > 0 {
// What's matched may be a substring of the key
if matches[0] != key {
return nil, false
}
if strings.Contains(matches[1], ":") {
caddy.Log().Named("caddyfile").Warn(
"Variadic placeholder {args[" + matches[1] + "]} must be a token on its own")
return nil, false
}
value, err := strconv.Atoi(matches[1])
if err != nil {
caddy.Log().Named("caddyfile").Warn(
"Placeholder {args[" + matches[1] + "]} has an invalid index")
return nil, false
}
if value >= len(args) {
caddy.Log().Named("caddyfile").Warn(
"Placeholder {args[" + matches[1] + "]} index is out of bounds, only " + strconv.Itoa(len(args)) + " argument(s) exist")
return nil, false
}
return args[value], true
}
// Not an args placeholder, ignore
return nil, false
})
return repl
}
var (
argsRegexpIndexDeprecated = regexp.MustCompile(`args\.(.+)`)
argsRegexpIndex = regexp.MustCompile(`args\[(.+)]`)
)
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