mirror of
https://github.com/caddyserver/caddy.git
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422 lines
12 KiB
Go
422 lines
12 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 fastcgi
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import (
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"encoding/json"
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"net/http"
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"strconv"
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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/fileserver"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp/reverseproxy"
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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.RegisterDirective("php_fastcgi", parsePHPFastCGI)
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}
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// UnmarshalCaddyfile deserializes Caddyfile tokens into h.
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//
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// transport fastcgi {
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// root <path>
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// split <at>
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// env <key> <value>
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// resolve_root_symlink
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// dial_timeout <duration>
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// read_timeout <duration>
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// write_timeout <duration>
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// capture_stderr
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// }
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func (t *Transport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
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for d.Next() {
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for d.NextBlock(0) {
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switch d.Val() {
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case "root":
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if !d.NextArg() {
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return d.ArgErr()
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}
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t.Root = d.Val()
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case "split":
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t.SplitPath = d.RemainingArgs()
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if len(t.SplitPath) == 0 {
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return d.ArgErr()
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}
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case "env":
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args := d.RemainingArgs()
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if len(args) != 2 {
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return d.ArgErr()
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}
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if t.EnvVars == nil {
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t.EnvVars = make(map[string]string)
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}
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t.EnvVars[args[0]] = args[1]
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case "resolve_root_symlink":
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if d.NextArg() {
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return d.ArgErr()
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}
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t.ResolveRootSymlink = true
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case "dial_timeout":
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if !d.NextArg() {
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return d.ArgErr()
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}
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dur, err := caddy.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad timeout value %s: %v", d.Val(), err)
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}
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t.DialTimeout = caddy.Duration(dur)
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case "read_timeout":
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if !d.NextArg() {
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return d.ArgErr()
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}
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dur, err := caddy.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad timeout value %s: %v", d.Val(), err)
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}
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t.ReadTimeout = caddy.Duration(dur)
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case "write_timeout":
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if !d.NextArg() {
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return d.ArgErr()
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}
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dur, err := caddy.ParseDuration(d.Val())
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if err != nil {
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return d.Errf("bad timeout value %s: %v", d.Val(), err)
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}
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t.WriteTimeout = caddy.Duration(dur)
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case "capture_stderr":
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if d.NextArg() {
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return d.ArgErr()
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}
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t.CaptureStderr = true
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default:
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return d.Errf("unrecognized subdirective %s", d.Val())
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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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// parsePHPFastCGI parses the php_fastcgi directive, which has the same syntax
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// as the reverse_proxy directive (in fact, the reverse_proxy's directive
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// Unmarshaler is invoked by this function) but the resulting proxy is specially
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// configured for most™️ PHP apps over FastCGI. A line such as this:
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//
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// php_fastcgi localhost:7777
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//
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// is equivalent to a route consisting of:
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//
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// # Add trailing slash for directory requests
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// @canonicalPath {
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// file {path}/index.php
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// not path */
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// }
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// redir @canonicalPath {path}/ 308
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//
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// # If the requested file does not exist, try index files
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// @indexFiles file {
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// try_files {path} {path}/index.php index.php
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// split_path .php
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// }
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// rewrite @indexFiles {http.matchers.file.relative}
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//
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// # Proxy PHP files to the FastCGI responder
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// @phpFiles path *.php
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// reverse_proxy @phpFiles localhost:7777 {
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// transport fastcgi {
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// split .php
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// }
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// }
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//
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// Thus, this directive produces multiple handlers, each with a different
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// matcher because multiple consecutive handlers are necessary to support
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// the common PHP use case. If this "common" config is not compatible
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// with a user's PHP requirements, they can use a manual approach based
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// on the example above to configure it precisely as they need.
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//
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// If a matcher is specified by the user, for example:
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//
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// php_fastcgi /subpath localhost:7777
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//
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// then the resulting handlers are wrapped in a subroute that uses the
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// user's matcher as a prerequisite to enter the subroute. In other
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// words, the directive's matcher is necessary, but not sufficient.
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func parsePHPFastCGI(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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// set up the transport for FastCGI, and specifically PHP
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fcgiTransport := Transport{}
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// set up the set of file extensions allowed to execute PHP code
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extensions := []string{".php"}
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// set the default index file for the try_files rewrites
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indexFile := "index.php"
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// set up for explicitly overriding try_files
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tryFiles := []string{}
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// if the user specified a matcher token, use that
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// matcher in a route that wraps both of our routes;
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// either way, strip the matcher token and pass
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// the remaining tokens to the unmarshaler so that
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// we can gain the rest of the reverse_proxy syntax
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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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// make a new dispenser from the remaining tokens so that we
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// can reset the dispenser back to this point for the
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// reverse_proxy unmarshaler to read from it as well
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dispenser := h.NewFromNextSegment()
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// read the subdirectives that we allow as overrides to
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// the php_fastcgi shortcut
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// NOTE: we delete the tokens as we go so that the reverse_proxy
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// unmarshal doesn't see these subdirectives which it cannot handle
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for dispenser.Next() {
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for dispenser.NextBlock(0) {
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// ignore any sub-subdirectives that might
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// have the same name somewhere within
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// the reverse_proxy passthrough tokens
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if dispenser.Nesting() != 1 {
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continue
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}
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// parse the php_fastcgi subdirectives
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switch dispenser.Val() {
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case "root":
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if !dispenser.NextArg() {
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return nil, dispenser.ArgErr()
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}
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fcgiTransport.Root = dispenser.Val()
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dispenser.DeleteN(2)
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case "split":
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extensions = dispenser.RemainingArgs()
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dispenser.DeleteN(len(extensions) + 1)
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if len(extensions) == 0 {
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return nil, dispenser.ArgErr()
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}
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case "env":
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args := dispenser.RemainingArgs()
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dispenser.DeleteN(len(args) + 1)
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if len(args) != 2 {
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return nil, dispenser.ArgErr()
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}
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if fcgiTransport.EnvVars == nil {
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fcgiTransport.EnvVars = make(map[string]string)
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}
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fcgiTransport.EnvVars[args[0]] = args[1]
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case "index":
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args := dispenser.RemainingArgs()
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dispenser.DeleteN(len(args) + 1)
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if len(args) != 1 {
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return nil, dispenser.ArgErr()
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}
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indexFile = args[0]
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case "try_files":
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args := dispenser.RemainingArgs()
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dispenser.DeleteN(len(args) + 1)
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if len(args) < 1 {
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return nil, dispenser.ArgErr()
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}
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tryFiles = args
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case "resolve_root_symlink":
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args := dispenser.RemainingArgs()
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dispenser.DeleteN(len(args) + 1)
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fcgiTransport.ResolveRootSymlink = true
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case "dial_timeout":
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if !dispenser.NextArg() {
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return nil, dispenser.ArgErr()
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}
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dur, err := caddy.ParseDuration(dispenser.Val())
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if err != nil {
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return nil, dispenser.Errf("bad timeout value %s: %v", dispenser.Val(), err)
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}
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fcgiTransport.DialTimeout = caddy.Duration(dur)
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dispenser.DeleteN(2)
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case "read_timeout":
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if !dispenser.NextArg() {
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return nil, dispenser.ArgErr()
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}
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dur, err := caddy.ParseDuration(dispenser.Val())
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if err != nil {
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return nil, dispenser.Errf("bad timeout value %s: %v", dispenser.Val(), err)
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}
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fcgiTransport.ReadTimeout = caddy.Duration(dur)
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dispenser.DeleteN(2)
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case "write_timeout":
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if !dispenser.NextArg() {
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return nil, dispenser.ArgErr()
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}
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dur, err := caddy.ParseDuration(dispenser.Val())
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if err != nil {
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return nil, dispenser.Errf("bad timeout value %s: %v", dispenser.Val(), err)
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}
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fcgiTransport.WriteTimeout = caddy.Duration(dur)
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dispenser.DeleteN(2)
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case "capture_stderr":
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args := dispenser.RemainingArgs()
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dispenser.DeleteN(len(args) + 1)
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fcgiTransport.CaptureStderr = true
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}
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}
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}
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// reset the dispenser after we're done so that the reverse_proxy
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// unmarshaler can read it from the start
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dispenser.Reset()
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// set up a route list that we'll append to
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routes := caddyhttp.RouteList{}
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// set the list of allowed path segments on which to split
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fcgiTransport.SplitPath = extensions
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// if the index is turned off, we skip the redirect and try_files
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if indexFile != "off" {
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// route to redirect to canonical path if index PHP file
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redirMatcherSet := caddy.ModuleMap{
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"file": h.JSON(fileserver.MatchFile{
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TryFiles: []string{"{http.request.uri.path}/" + indexFile},
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}),
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"not": h.JSON(caddyhttp.MatchNot{
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MatcherSetsRaw: []caddy.ModuleMap{
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{
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"path": h.JSON(caddyhttp.MatchPath{"*/"}),
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},
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},
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}),
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}
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redirHandler := caddyhttp.StaticResponse{
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StatusCode: caddyhttp.WeakString(strconv.Itoa(http.StatusPermanentRedirect)),
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Headers: http.Header{"Location": []string{"{http.request.orig_uri.path}/"}},
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}
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redirRoute := caddyhttp.Route{
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MatcherSetsRaw: []caddy.ModuleMap{redirMatcherSet},
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HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(redirHandler, "handler", "static_response", nil)},
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}
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// if tryFiles wasn't overridden, use a reasonable default
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if len(tryFiles) == 0 {
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tryFiles = []string{"{http.request.uri.path}", "{http.request.uri.path}/" + indexFile, indexFile}
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}
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// route to rewrite to PHP index file
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rewriteMatcherSet := caddy.ModuleMap{
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"file": h.JSON(fileserver.MatchFile{
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TryFiles: tryFiles,
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SplitPath: extensions,
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}),
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}
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rewriteHandler := rewrite.Rewrite{
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URI: "{http.matchers.file.relative}",
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}
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rewriteRoute := caddyhttp.Route{
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MatcherSetsRaw: []caddy.ModuleMap{rewriteMatcherSet},
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HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(rewriteHandler, "handler", "rewrite", nil)},
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}
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routes = append(routes, redirRoute, rewriteRoute)
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}
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// route to actually reverse proxy requests to PHP files;
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// match only requests that are for PHP files
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pathList := []string{}
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for _, ext := range extensions {
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pathList = append(pathList, "*"+ext)
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}
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rpMatcherSet := caddy.ModuleMap{
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"path": h.JSON(pathList),
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}
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// create the reverse proxy handler which uses our FastCGI transport
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rpHandler := &reverseproxy.Handler{
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TransportRaw: caddyconfig.JSONModuleObject(fcgiTransport, "protocol", "fastcgi", nil),
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}
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// the rest of the config is specified by the user
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// using the reverse_proxy directive syntax
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dispenser.Next() // consume the directive name
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err = rpHandler.UnmarshalCaddyfile(dispenser)
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if err != nil {
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return nil, err
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}
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err = rpHandler.FinalizeUnmarshalCaddyfile(h)
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if err != nil {
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return nil, err
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}
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// create the final reverse proxy route which is
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// conditional on matching PHP files
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rpRoute := caddyhttp.Route{
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MatcherSetsRaw: []caddy.ModuleMap{rpMatcherSet},
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HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(rpHandler, "handler", "reverse_proxy", nil)},
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}
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subroute := caddyhttp.Subroute{
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Routes: append(routes, rpRoute),
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}
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// the user's matcher is a prerequisite for ours, so
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// wrap ours in a subroute and return that
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if userMatcherSet != nil {
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return []httpcaddyfile.ConfigValue{
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{
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Class: "route",
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Value: caddyhttp.Route{
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MatcherSetsRaw: []caddy.ModuleMap{userMatcherSet},
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HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(subroute, "handler", "subroute", nil)},
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},
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},
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}, nil
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}
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// otherwise, return the literal subroute instead of
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// individual routes, to ensure they stay together and
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// are treated as a single unit, without necessarily
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// creating an actual subroute in the output
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return []httpcaddyfile.ConfigValue{
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{
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Class: "route",
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Value: subroute,
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},
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}, nil
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}
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