mirror of
https://github.com/caddyserver/caddy.git
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115 lines
3.3 KiB
Go
115 lines
3.3 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package maphandler
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import (
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"strings"
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"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp"
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)
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func init() {
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httpcaddyfile.RegisterHandlerDirective("map", parseCaddyfile)
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}
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// parseCaddyfile sets up the map handler from Caddyfile tokens. Syntax:
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//
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// map [<matcher>] <source> <destinations...> {
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// [~]<input> <outputs...>
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// default <defaults...>
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// }
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//
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// If the input value is prefixed with a tilde (~), then the input will be parsed as a
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// regular expression.
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//
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// The Caddyfile adapter treats outputs that are a literal hyphen (-) as a null/nil
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// value. This is useful if you want to fall back to default for that particular output.
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//
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// The number of outputs for each mapping must not be more than the number of destinations.
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// However, for convenience, there may be fewer outputs than destinations and any missing
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// outputs will be filled in implicitly.
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func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
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var handler Handler
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for h.Next() {
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// source
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if !h.NextArg() {
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return nil, h.ArgErr()
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}
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handler.Source = h.Val()
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// destinations
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handler.Destinations = h.RemainingArgs()
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if len(handler.Destinations) == 0 {
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return nil, h.Err("missing destination argument(s)")
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}
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for _, dest := range handler.Destinations {
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if shorthand := httpcaddyfile.WasReplacedPlaceholderShorthand(dest); shorthand != "" {
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return nil, h.Errf("destination %s conflicts with a Caddyfile placeholder shorthand", shorthand)
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}
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}
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// mappings
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for h.NextBlock(0) {
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// defaults are a special case
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if h.Val() == "default" {
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if len(handler.Defaults) > 0 {
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return nil, h.Err("defaults already defined")
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}
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handler.Defaults = h.RemainingArgs()
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for len(handler.Defaults) < len(handler.Destinations) {
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handler.Defaults = append(handler.Defaults, "")
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}
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continue
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}
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// every line maps an input value to one or more outputs
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in := h.Val()
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var outs []any
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for h.NextArg() {
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val := h.ScalarVal()
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if val == "-" {
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outs = append(outs, nil)
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} else {
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outs = append(outs, val)
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}
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}
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// cannot have more outputs than destinations
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if len(outs) > len(handler.Destinations) {
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return nil, h.Err("too many outputs")
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}
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// for convenience, can have fewer outputs than destinations, but the
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// underlying handler won't accept that, so we fill in nil values
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for len(outs) < len(handler.Destinations) {
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outs = append(outs, nil)
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}
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// create the mapping
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mapping := Mapping{Outputs: outs}
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if strings.HasPrefix(in, "~") {
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mapping.InputRegexp = in[1:]
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} else {
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mapping.Input = in
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}
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handler.Mappings = append(handler.Mappings, mapping)
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}
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}
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return handler, nil
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}
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