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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 fileserver
import (
"path/filepath"
"strings"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/caddyserver/caddy/v2/modules/caddyhttp/encode"
"github.com/caddyserver/caddy/v2/modules/caddyhttp/rewrite"
)
func init() {
httpcaddyfile.RegisterHandlerDirective("file_server", parseCaddyfile)
httpcaddyfile.RegisterDirective("try_files", parseTryFiles)
}
// parseCaddyfile parses the file_server directive. It enables the static file
// server and configures it with this syntax:
//
// file_server [<matcher>] [browse] {
// root <path>
// hide <files...>
// index <files...>
// browse [<template_file>]
// precompressed <formats...>
// status <status>
// }
//
func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
var fsrv FileServer
for h.Next() {
args := h.RemainingArgs()
switch len(args) {
case 0:
case 1:
if args[0] != "browse" {
return nil, h.ArgErr()
}
fsrv.Browse = new(Browse)
default:
return nil, h.ArgErr()
}
for h.NextBlock(0) {
switch h.Val() {
case "hide":
fsrv.Hide = h.RemainingArgs()
if len(fsrv.Hide) == 0 {
return nil, h.ArgErr()
}
case "index":
fsrv.IndexNames = h.RemainingArgs()
if len(fsrv.IndexNames) == 0 {
return nil, h.ArgErr()
}
case "root":
if !h.Args(&fsrv.Root) {
return nil, h.ArgErr()
}
case "browse":
if fsrv.Browse != nil {
return nil, h.Err("browsing is already configured")
}
fsrv.Browse = new(Browse)
h.Args(&fsrv.Browse.TemplateFile)
case "precompressed":
var order []string
for h.NextArg() {
modID := "http.precompressed." + h.Val()
mod, err := caddy.GetModule(modID)
if err != nil {
return nil, h.Errf("getting module named '%s': %v", modID, err)
}
inst := mod.New()
precompress, ok := inst.(encode.Precompressed)
if !ok {
return nil, h.Errf("module %s is not a precompressor; is %T", modID, inst)
}
if fsrv.PrecompressedRaw == nil {
fsrv.PrecompressedRaw = make(caddy.ModuleMap)
}
fsrv.PrecompressedRaw[h.Val()] = caddyconfig.JSON(precompress, nil)
order = append(order, h.Val())
}
fsrv.PrecompressedOrder = order
case "status":
if !h.NextArg() {
return nil, h.ArgErr()
}
fsrv.StatusCode = caddyhttp.WeakString(h.Val())
default:
return nil, h.Errf("unknown subdirective '%s'", h.Val())
}
}
}
// hide the Caddyfile (and any imported Caddyfiles)
if configFiles := h.Caddyfiles(); len(configFiles) > 0 {
for _, file := range configFiles {
file = filepath.Clean(file)
if !fileHidden(file, fsrv.Hide) {
// if there's no path separator, the file server module will hide all
// files by that name, rather than a specific one; but we want to hide
// only this specific file, so ensure there's always a path separator
if !strings.Contains(file, separator) {
file = "." + separator + file
}
fsrv.Hide = append(fsrv.Hide, file)
}
}
}
return &fsrv, nil
}
// parseTryFiles parses the try_files directive. It combines a file matcher
// with a rewrite directive, so this is not a standard handler directive.
// A try_files directive has this syntax (notice no matcher tokens accepted):
//
// try_files <files...>
//
// and is basically shorthand for:
//
// @try_files {
// file {
// try_files <files...>
// }
// }
// rewrite @try_files {http.matchers.file.relative}
//
// This directive rewrites request paths only, preserving any other part
// of the URI, unless the part is explicitly given in the file list. For
// example, if any of the files in the list have a query string:
//
// try_files {path} index.php?{query}&p={path}
//
// then the query string will not be treated as part of the file name; and
// if that file matches, the given query string will replace any query string
// that already exists on the request URI.
func parseTryFiles(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error) {
if !h.Next() {
return nil, h.ArgErr()
}
tryFiles := h.RemainingArgs()
if len(tryFiles) == 0 {
return nil, h.ArgErr()
}
// makeRoute returns a route that tries the files listed in try
// and then rewrites to the matched file; userQueryString is
// appended to the rewrite rule.
makeRoute := func(try []string, userQueryString string) []httpcaddyfile.ConfigValue {
handler := rewrite.Rewrite{
URI: "{http.matchers.file.relative}" + userQueryString,
}
matcherSet := caddy.ModuleMap{
"file": h.JSON(MatchFile{TryFiles: try}),
}
return h.NewRoute(matcherSet, handler)
}
var result []httpcaddyfile.ConfigValue
// if there are query strings in the list, we have to split into
// a separate route for each item with a query string, because
// the rewrite is different for that item
try := make([]string, 0, len(tryFiles))
for _, item := range tryFiles {
if idx := strings.Index(item, "?"); idx >= 0 {
if len(try) > 0 {
result = append(result, makeRoute(try, "")...)
try = []string{}
}
result = append(result, makeRoute([]string{item[:idx]}, item[idx:])...)
continue
}
// accumulate consecutive non-query-string parameters
try = append(try, item)
}
if len(try) > 0 {
result = append(result, makeRoute(try, "")...)
}
// ensure that multiple routes (possible if rewrite targets
// have query strings, for example) are grouped together
// so only the first matching rewrite is performed (#2891)
h.GroupRoutes(result)
return result, nil
}
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