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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 rewrite
import (
"strconv"
"strings"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
func init() {
httpcaddyfile.RegisterHandlerDirective("rewrite", parseCaddyfileRewrite)
httpcaddyfile.RegisterHandlerDirective("uri", parseCaddyfileURI)
}
// parseCaddyfileRewrite sets up a basic rewrite handler from Caddyfile tokens. Syntax:
//
// rewrite [<matcher>] <to>
//
// Only URI components which are given in <to> will be set in the resulting URI.
// See the docs for the rewrite handler for more information.
func parseCaddyfileRewrite(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var rewr Rewrite
for h.Next() {
if !h.NextArg() {
return nil, h.ArgErr()
}
rewr.URI = h.Val()
if h.NextArg() {
return nil, h.ArgErr()
}
}
return rewr, nil
}
// parseCaddyfileURI sets up a handler for manipulating (but not "rewriting") the
// URI from Caddyfile tokens. Syntax:
//
// uri [<matcher>] strip_prefix|strip_suffix|replace <target> [<replacement> [<limit>]]
//
// If strip_prefix or strip_suffix are used, then <target> will be stripped
// only if it is the beginning or the end, respectively, of the URI path. If
// replace is used, then <target> will be replaced with <replacement> across
// the whole URI, up to <limit> times (or unlimited if unspecified).
func parseCaddyfileURI(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var rewr Rewrite
for h.Next() {
args := h.RemainingArgs()
if len(args) < 2 {
return nil, h.ArgErr()
}
switch args[0] {
case "strip_prefix":
if len(args) > 2 {
return nil, h.ArgErr()
}
rewr.StripPathPrefix = args[1]
if !strings.HasPrefix(rewr.StripPathPrefix, "/") {
rewr.StripPathPrefix = "/" + rewr.StripPathPrefix
}
case "strip_suffix":
if len(args) > 2 {
return nil, h.ArgErr()
}
rewr.StripPathSuffix = args[1]
case "replace":
var find, replace, lim string
switch len(args) {
case 4:
lim = args[3]
fallthrough
case 3:
find = args[1]
replace = args[2]
default:
return nil, h.ArgErr()
}
var limInt int
if lim != "" {
var err error
limInt, err = strconv.Atoi(lim)
if err != nil {
return nil, h.Errf("limit must be an integer; invalid: %v", err)
}
}
rewr.URISubstring = append(rewr.URISubstring, replacer{
Find: find,
Replace: replace,
Limit: limInt,
})
default:
return nil, h.Errf("unrecognized URI manipulation '%s'", args[0])
}
}
return rewr, nil
}
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