mirror of
https://github.com/caddyserver/caddy.git
synced 2025-11-03 19:17:29 -05:00
294 lines
8.0 KiB
Go
294 lines
8.0 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 rewrite
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import (
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"encoding/json"
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"strconv"
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"strings"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/caddyconfig"
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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.RegisterDirective("rewrite", parseCaddyfileRewrite)
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httpcaddyfile.RegisterHandlerDirective("method", parseCaddyfileMethod)
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httpcaddyfile.RegisterHandlerDirective("uri", parseCaddyfileURI)
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httpcaddyfile.RegisterDirective("handle_path", parseCaddyfileHandlePath)
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}
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// parseCaddyfileRewrite sets up a basic rewrite handler from Caddyfile tokens. Syntax:
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//
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// rewrite [<matcher>] <to>
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//
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// Only URI components which are given in <to> will be set in the resulting URI.
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// See the docs for the rewrite handler for more information.
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func parseCaddyfileRewrite(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error) {
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h.Next() // consume directive name
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// count the tokens to determine what to do
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argsCount := h.CountRemainingArgs()
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if argsCount == 0 {
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return nil, h.Errf("too few arguments; must have at least a rewrite URI")
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}
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if argsCount > 2 {
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return nil, h.Errf("too many arguments; should only be a matcher and a URI")
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}
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// with only one arg, assume it's a rewrite URI with no matcher token
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if argsCount == 1 {
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if !h.NextArg() {
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return nil, h.ArgErr()
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}
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return h.NewRoute(nil, Rewrite{URI: h.Val()}), nil
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}
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// parse the matcher token into a matcher set
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userMatcherSet, err := h.ExtractMatcherSet()
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if err != nil {
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return nil, err
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}
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h.Next() // consume directive name again, matcher parsing does a reset
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h.Next() // advance to the rewrite URI
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return h.NewRoute(userMatcherSet, Rewrite{URI: h.Val()}), nil
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}
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// parseCaddyfileMethod sets up a basic method rewrite handler from Caddyfile tokens. Syntax:
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//
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// method [<matcher>] <method>
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func parseCaddyfileMethod(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
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h.Next() // consume directive name
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if !h.NextArg() {
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return nil, h.ArgErr()
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}
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if h.NextArg() {
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return nil, h.ArgErr()
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}
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return Rewrite{Method: h.Val()}, nil
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}
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// parseCaddyfileURI sets up a handler for manipulating (but not "rewriting") the
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// URI from Caddyfile tokens. Syntax:
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//
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// uri [<matcher>] strip_prefix|strip_suffix|replace|path_regexp <target> [<replacement> [<limit>]]
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//
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// If strip_prefix or strip_suffix are used, then <target> will be stripped
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// only if it is the beginning or the end, respectively, of the URI path. If
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// replace is used, then <target> will be replaced with <replacement> across
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// the whole URI, up to <limit> times (or unlimited if unspecified). If
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// path_regexp is used, then regular expression replacements will be performed
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// on the path portion of the URI (and a limit cannot be set).
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func parseCaddyfileURI(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
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h.Next() // consume directive name
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args := h.RemainingArgs()
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if len(args) < 1 {
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return nil, h.ArgErr()
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}
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var rewr Rewrite
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switch args[0] {
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case "strip_prefix":
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if len(args) != 2 {
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return nil, h.ArgErr()
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}
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rewr.StripPathPrefix = args[1]
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case "strip_suffix":
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if len(args) != 2 {
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return nil, h.ArgErr()
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}
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rewr.StripPathSuffix = args[1]
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case "replace":
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var find, replace, lim string
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switch len(args) {
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case 4:
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lim = args[3]
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fallthrough
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case 3:
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find = args[1]
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replace = args[2]
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default:
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return nil, h.ArgErr()
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}
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var limInt int
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if lim != "" {
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var err error
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limInt, err = strconv.Atoi(lim)
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if err != nil {
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return nil, h.Errf("limit must be an integer; invalid: %v", err)
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}
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}
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rewr.URISubstring = append(rewr.URISubstring, substrReplacer{
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Find: find,
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Replace: replace,
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Limit: limInt,
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})
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case "path_regexp":
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if len(args) != 3 {
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return nil, h.ArgErr()
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}
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find, replace := args[1], args[2]
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rewr.PathRegexp = append(rewr.PathRegexp, ®exReplacer{
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Find: find,
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Replace: replace,
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})
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case "query":
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if len(args) > 4 {
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return nil, h.ArgErr()
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}
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rewr.Query = &queryOps{}
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var hasArgs bool
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if len(args) > 1 {
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hasArgs = true
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err := applyQueryOps(h, rewr.Query, args[1:])
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if err != nil {
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return nil, err
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}
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}
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for h.NextBlock(0) {
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if hasArgs {
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return nil, h.Err("Cannot specify uri query rewrites in both argument and block")
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}
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queryArgs := []string{h.Val()}
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queryArgs = append(queryArgs, h.RemainingArgs()...)
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err := applyQueryOps(h, rewr.Query, queryArgs)
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if err != nil {
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return nil, err
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}
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}
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default:
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return nil, h.Errf("unrecognized URI manipulation '%s'", args[0])
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}
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return rewr, nil
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}
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func applyQueryOps(h httpcaddyfile.Helper, qo *queryOps, args []string) error {
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key := args[0]
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switch {
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case strings.HasPrefix(key, "-"):
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if len(args) != 1 {
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return h.ArgErr()
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}
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qo.Delete = append(qo.Delete, strings.TrimLeft(key, "-"))
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case strings.HasPrefix(key, "+"):
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if len(args) != 2 {
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return h.ArgErr()
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}
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param := strings.TrimLeft(key, "+")
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qo.Add = append(qo.Add, queryOpsArguments{Key: param, Val: args[1]})
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case strings.Contains(key, ">"):
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if len(args) != 1 {
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return h.ArgErr()
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}
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renameValKey := strings.Split(key, ">")
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qo.Rename = append(qo.Rename, queryOpsArguments{Key: renameValKey[0], Val: renameValKey[1]})
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case len(args) == 3:
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qo.Replace = append(qo.Replace, &queryOpsReplacement{Key: key, SearchRegexp: args[1], Replace: args[2]})
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default:
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if len(args) != 2 {
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return h.ArgErr()
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}
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qo.Set = append(qo.Set, queryOpsArguments{Key: key, Val: args[1]})
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}
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return nil
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}
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// parseCaddyfileHandlePath parses the handle_path directive. Syntax:
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//
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// handle_path [<matcher>] {
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// <directives...>
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// }
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//
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// Only path matchers (with a `/` prefix) are supported as this is a shortcut
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// for the handle directive with a strip_prefix rewrite.
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func parseCaddyfileHandlePath(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error) {
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h.Next() // consume directive name
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// there must be a path matcher
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if !h.NextArg() {
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return nil, h.ArgErr()
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}
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// read the prefix to strip
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path := h.Val()
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if !strings.HasPrefix(path, "/") {
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return nil, h.Errf("path matcher must begin with '/', got %s", path)
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}
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// we only want to strip what comes before the '/' if
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// the user specified it (e.g. /api/* should only strip /api)
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var stripPath string
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if strings.HasSuffix(path, "/*") {
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stripPath = path[:len(path)-2]
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} else if strings.HasSuffix(path, "*") {
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stripPath = path[:len(path)-1]
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} else {
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stripPath = path
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}
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// the ParseSegmentAsSubroute function expects the cursor
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// to be at the token just before the block opening,
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// so we need to rewind because we already read past it
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h.Reset()
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h.Next()
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// parse the block contents as a subroute handler
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handler, err := httpcaddyfile.ParseSegmentAsSubroute(h)
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if err != nil {
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return nil, err
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}
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subroute, ok := handler.(*caddyhttp.Subroute)
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if !ok {
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return nil, h.Errf("segment was not parsed as a subroute")
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}
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// make a matcher on the path and everything below it
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pathMatcher := caddy.ModuleMap{
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"path": h.JSON(caddyhttp.MatchPath{path}),
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}
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// build a route with a rewrite handler to strip the path prefix
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route := caddyhttp.Route{
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HandlersRaw: []json.RawMessage{
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caddyconfig.JSONModuleObject(Rewrite{
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StripPathPrefix: stripPath,
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}, "handler", "rewrite", nil),
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},
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}
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// prepend the route to the subroute
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subroute.Routes = append([]caddyhttp.Route{route}, subroute.Routes...)
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// build and return a route from the subroute
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return h.NewRoute(pathMatcher, subroute), nil
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}
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