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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("strip_prefix", parseCaddyfileStripPrefix)
httpcaddyfile.RegisterHandlerDirective("strip_suffix", parseCaddyfileStripSuffix)
httpcaddyfile.RegisterHandlerDirective("uri_replace", parseCaddyfileURIReplace)
}
// 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
}
// parseCaddyfileStripPrefix sets up a handler from Caddyfile tokens. Syntax:
//
// strip_prefix [<matcher>] <prefix>
//
// The request path will be stripped the given prefix.
func parseCaddyfileStripPrefix(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var rewr Rewrite
for h.Next() {
if !h.NextArg() {
return nil, h.ArgErr()
}
rewr.StripPathPrefix = h.Val()
if !strings.HasPrefix(rewr.StripPathPrefix, "/") {
rewr.StripPathPrefix = "/" + rewr.StripPathPrefix
}
if h.NextArg() {
return nil, h.ArgErr()
}
}
return rewr, nil
}
// parseCaddyfileStripSuffix sets up a handler from Caddyfile tokens. Syntax:
//
// strip_suffix [<matcher>] <suffix>
//
// The request path will be stripped the given suffix.
func parseCaddyfileStripSuffix(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var rewr Rewrite
for h.Next() {
if !h.NextArg() {
return nil, h.ArgErr()
}
rewr.StripPathSuffix = h.Val()
if h.NextArg() {
return nil, h.ArgErr()
}
}
return rewr, nil
}
// parseCaddyfileURIReplace sets up a handler from Caddyfile tokens. Syntax:
//
// uri_replace [<matcher>] <find> <replace> [<limit>]
//
// Substring replacements will be performed on the request URI up to the
// number specified by limit, if any (default = 0, or no limit).
func parseCaddyfileURIReplace(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var rewr Rewrite
var repls []replacer
for h.Next() {
args := h.RemainingArgs()
var find, replace, lim string
switch len(args) {
case 3:
lim = args[2]
fallthrough
case 2:
find = args[0]
replace = args[1]
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)
}
}
repls = append(repls, replacer{
Find: find,
Replace: replace,
Limit: limInt,
})
}
rewr.URISubstring = repls
return rewr, nil
}
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