mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-05 07:24:08 +08:00
307 lines
8.7 KiB
Go
307 lines
8.7 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 fileserver
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import (
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"path/filepath"
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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/caddyfile"
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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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"github.com/caddyserver/caddy/v2/modules/caddyhttp/encode"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp/rewrite"
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)
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func init() {
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httpcaddyfile.RegisterHandlerDirective("file_server", parseCaddyfile)
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httpcaddyfile.RegisterDirective("try_files", parseTryFiles)
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}
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// parseCaddyfile parses the file_server directive.
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// See UnmarshalCaddyfile for the syntax.
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func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
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fsrv := new(FileServer)
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err := fsrv.UnmarshalCaddyfile(h.Dispenser)
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if err != nil {
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return fsrv, err
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}
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err = fsrv.FinalizeUnmarshalCaddyfile(h)
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if err != nil {
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return nil, err
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}
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return fsrv, err
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}
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// UnmarshalCaddyfile parses the file_server directive. It enables
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// the static file server and configures it with this syntax:
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//
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// file_server [<matcher>] [browse] {
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// fs <filesystem>
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// root <path>
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// hide <files...>
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// index <files...>
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// browse [<template_file>]
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// precompressed <formats...>
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// status <status>
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// disable_canonical_uris
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// }
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//
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// The FinalizeUnmarshalCaddyfile method should be called after this
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// to finalize setup of hidden Caddyfiles.
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func (fsrv *FileServer) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
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d.Next() // consume directive name
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args := d.RemainingArgs()
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switch len(args) {
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case 0:
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case 1:
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if args[0] != "browse" {
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return d.ArgErr()
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}
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fsrv.Browse = new(Browse)
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default:
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return d.ArgErr()
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}
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for d.NextBlock(0) {
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switch d.Val() {
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case "fs":
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if !d.NextArg() {
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return d.ArgErr()
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}
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if fsrv.FileSystem != "" {
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return d.Err("file system already specified")
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}
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fsrv.FileSystem = d.Val()
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case "hide":
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fsrv.Hide = d.RemainingArgs()
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if len(fsrv.Hide) == 0 {
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return d.ArgErr()
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}
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case "index":
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fsrv.IndexNames = d.RemainingArgs()
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if len(fsrv.IndexNames) == 0 {
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return d.ArgErr()
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}
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case "root":
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if !d.Args(&fsrv.Root) {
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return d.ArgErr()
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}
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case "browse":
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if fsrv.Browse != nil {
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return d.Err("browsing is already configured")
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}
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fsrv.Browse = new(Browse)
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d.Args(&fsrv.Browse.TemplateFile)
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for nesting := d.Nesting(); d.NextBlock(nesting); {
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switch d.Val() {
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case "reveal_symlinks":
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if fsrv.Browse.RevealSymlinks {
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return d.Err("Symlinks path reveal is already enabled")
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}
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fsrv.Browse.RevealSymlinks = true
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default:
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return d.Errf("unknown subdirective '%s'", d.Val())
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}
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}
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case "precompressed":
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var order []string
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for d.NextArg() {
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modID := "http.precompressed." + d.Val()
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mod, err := caddy.GetModule(modID)
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if err != nil {
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return d.Errf("getting module named '%s': %v", modID, err)
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}
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inst := mod.New()
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precompress, ok := inst.(encode.Precompressed)
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if !ok {
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return d.Errf("module %s is not a precompressor; is %T", modID, inst)
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}
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if fsrv.PrecompressedRaw == nil {
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fsrv.PrecompressedRaw = make(caddy.ModuleMap)
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}
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fsrv.PrecompressedRaw[d.Val()] = caddyconfig.JSON(precompress, nil)
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order = append(order, d.Val())
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}
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fsrv.PrecompressedOrder = order
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case "status":
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if !d.NextArg() {
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return d.ArgErr()
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}
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fsrv.StatusCode = caddyhttp.WeakString(d.Val())
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case "disable_canonical_uris":
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if d.NextArg() {
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return d.ArgErr()
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}
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falseBool := false
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fsrv.CanonicalURIs = &falseBool
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case "pass_thru":
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if d.NextArg() {
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return d.ArgErr()
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}
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fsrv.PassThru = true
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case "etag_file_extensions":
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etagFileExtensions := d.RemainingArgs()
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if len(etagFileExtensions) == 0 {
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return d.ArgErr()
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}
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fsrv.EtagFileExtensions = etagFileExtensions
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default:
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return d.Errf("unknown subdirective '%s'", d.Val())
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}
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}
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return nil
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}
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// FinalizeUnmarshalCaddyfile finalizes the Caddyfile parsing which
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// requires having an httpcaddyfile.Helper to function, to setup hidden Caddyfiles.
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func (fsrv *FileServer) FinalizeUnmarshalCaddyfile(h httpcaddyfile.Helper) error {
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// Hide the Caddyfile (and any imported Caddyfiles).
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// This needs to be done in here instead of UnmarshalCaddyfile
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// because UnmarshalCaddyfile only has access to the dispenser
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// and not the helper, and only the helper has access to the
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// Caddyfiles function.
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if configFiles := h.Caddyfiles(); len(configFiles) > 0 {
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for _, file := range configFiles {
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file = filepath.Clean(file)
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if !fileHidden(file, fsrv.Hide) {
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// if there's no path separator, the file server module will hide all
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// files by that name, rather than a specific one; but we want to hide
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// only this specific file, so ensure there's always a path separator
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if !strings.Contains(file, separator) {
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file = "." + separator + file
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}
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fsrv.Hide = append(fsrv.Hide, file)
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}
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}
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}
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return nil
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}
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// parseTryFiles parses the try_files directive. It combines a file matcher
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// with a rewrite directive, so this is not a standard handler directive.
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// A try_files directive has this syntax (notice no matcher tokens accepted):
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//
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// try_files <files...> {
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// policy first_exist|smallest_size|largest_size|most_recently_modified
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// }
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//
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// and is basically shorthand for:
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//
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// @try_files file {
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// try_files <files...>
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// policy first_exist|smallest_size|largest_size|most_recently_modified
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// }
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// rewrite @try_files {http.matchers.file.relative}
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//
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// This directive rewrites request paths only, preserving any other part
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// of the URI, unless the part is explicitly given in the file list. For
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// example, if any of the files in the list have a query string:
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//
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// try_files {path} index.php?{query}&p={path}
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//
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// then the query string will not be treated as part of the file name; and
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// if that file matches, the given query string will replace any query string
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// that already exists on the request URI.
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func parseTryFiles(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error) {
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if !h.Next() {
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return nil, h.ArgErr()
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}
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tryFiles := h.RemainingArgs()
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if len(tryFiles) == 0 {
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return nil, h.ArgErr()
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}
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// parse out the optional try policy
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var tryPolicy string
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for h.NextBlock(0) {
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switch h.Val() {
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case "policy":
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if tryPolicy != "" {
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return nil, h.Err("try policy already configured")
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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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tryPolicy = h.Val()
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switch tryPolicy {
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case tryPolicyFirstExist, tryPolicyLargestSize, tryPolicySmallestSize, tryPolicyMostRecentlyMod:
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default:
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return nil, h.Errf("unrecognized try policy: %s", tryPolicy)
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}
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}
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}
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// makeRoute returns a route that tries the files listed in try
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// and then rewrites to the matched file; userQueryString is
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// appended to the rewrite rule.
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makeRoute := func(try []string, userQueryString string) []httpcaddyfile.ConfigValue {
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handler := rewrite.Rewrite{
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URI: "{http.matchers.file.relative}" + userQueryString,
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}
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matcherSet := caddy.ModuleMap{
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"file": h.JSON(MatchFile{TryFiles: try, TryPolicy: tryPolicy}),
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}
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return h.NewRoute(matcherSet, handler)
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}
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var result []httpcaddyfile.ConfigValue
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// if there are query strings in the list, we have to split into
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// a separate route for each item with a query string, because
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// the rewrite is different for that item
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try := make([]string, 0, len(tryFiles))
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for _, item := range tryFiles {
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if idx := strings.Index(item, "?"); idx >= 0 {
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if len(try) > 0 {
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result = append(result, makeRoute(try, "")...)
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try = []string{}
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}
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result = append(result, makeRoute([]string{item[:idx]}, item[idx:])...)
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continue
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}
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// accumulate consecutive non-query-string parameters
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try = append(try, item)
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}
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if len(try) > 0 {
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result = append(result, makeRoute(try, "")...)
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}
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// ensure that multiple routes (possible if rewrite targets
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// have query strings, for example) are grouped together
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// so only the first matching rewrite is performed (#2891)
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h.GroupRoutes(result)
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return result, nil
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}
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var _ caddyfile.Unmarshaler = (*FileServer)(nil)
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