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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 maphandler
import (
"strings"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
func init() {
httpcaddyfile.RegisterHandlerDirective("map", parseCaddyfile)
}
// parseCaddyfile sets up the map handler from Caddyfile tokens. Syntax:
//
// map [<matcher>] <source> <destinations...> {
// [~]<input> <outputs...>
// default <defaults...>
// }
//
// If the input value is prefixed with a tilde (~), then the input will be parsed as a
// regular expression.
//
// The Caddyfile adapter treats outputs that are a literal hyphen (-) as a null/nil
// value. This is useful if you want to fall back to default for that particular output.
//
// The number of outputs for each mapping must not be more than the number of destinations.
// However, for convenience, there may be fewer outputs than destinations and any missing
// outputs will be filled in implicitly.
func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var handler Handler
for h.Next() {
// source
if !h.NextArg() {
return nil, h.ArgErr()
}
handler.Source = h.Val()
// destinations
handler.Destinations = h.RemainingArgs()
if len(handler.Destinations) == 0 {
return nil, h.Err("missing destination argument(s)")
}
for _, dest := range handler.Destinations {
if shorthand := httpcaddyfile.WasReplacedPlaceholderShorthand(dest); shorthand != "" {
return nil, h.Errf("destination %s conflicts with a Caddyfile placeholder shorthand", shorthand)
}
}
// mappings
for h.NextBlock(0) {
// defaults are a special case
if h.Val() == "default" {
if len(handler.Defaults) > 0 {
return nil, h.Err("defaults already defined")
}
handler.Defaults = h.RemainingArgs()
for len(handler.Defaults) < len(handler.Destinations) {
handler.Defaults = append(handler.Defaults, "")
}
continue
}
// every line maps an input value to one or more outputs
in := h.Val()
var outs []any
for h.NextArg() {
val := h.ScalarVal()
if val == "-" {
outs = append(outs, nil)
} else {
outs = append(outs, val)
}
}
// cannot have more outputs than destinations
if len(outs) > len(handler.Destinations) {
return nil, h.Err("too many outputs")
}
// for convenience, can have fewer outputs than destinations, but the
// underlying handler won't accept that, so we fill in nil values
for len(outs) < len(handler.Destinations) {
outs = append(outs, nil)
}
// create the mapping
mapping := Mapping{Outputs: outs}
if strings.HasPrefix(in, "~") {
mapping.InputRegexp = in[1:]
} else {
mapping.Input = in
}
handler.Mappings = append(handler.Mappings, mapping)
}
}
return handler, nil
}
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