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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 fastcgi
import (
"encoding/json"
"net/http"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/caddyserver/caddy/v2/modules/caddyhttp/fileserver"
"github.com/caddyserver/caddy/v2/modules/caddyhttp/reverseproxy"
"github.com/caddyserver/caddy/v2/modules/caddyhttp/rewrite"
)
func init() {
httpcaddyfile.RegisterDirective("php_fastcgi", parsePHPFastCGI)
}
// UnmarshalCaddyfile deserializes Caddyfile tokens into h.
//
// transport fastcgi {
// root <path>
// split <at>
// env <key> <value>
// }
//
func (t *Transport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
for d.Next() {
for d.NextBlock(0) {
switch d.Val() {
case "root":
if !d.NextArg() {
return d.ArgErr()
}
t.Root = d.Val()
case "split":
t.SplitPath = d.RemainingArgs()
if len(t.SplitPath) == 0 {
return d.ArgErr()
}
case "env":
args := d.RemainingArgs()
if len(args) != 2 {
return d.ArgErr()
}
if t.EnvVars == nil {
t.EnvVars = make(map[string]string)
}
t.EnvVars[args[0]] = args[1]
default:
return d.Errf("unrecognized subdirective %s", d.Val())
}
}
}
return nil
}
// parsePHPFastCGI parses the php_fastcgi directive, which has the same syntax
// as the reverse_proxy directive (in fact, the reverse_proxy's directive
// Unmarshaler is invoked by this function) but the resulting proxy is specially
// configured for most™️ PHP apps over FastCGI. A line such as this:
//
// php_fastcgi localhost:7777
//
// is equivalent to a route consisting of:
//
// @canonicalPath {
// file {
// try_files {path}/index.php
// }
// not {
// path */
// }
// }
// redir @canonicalPath {path}/ 308
//
// try_files {path} {path}/index.php index.php
//
// @phpFiles {
// path *.php
// }
// reverse_proxy @phpFiles localhost:7777 {
// transport fastcgi {
// split .php
// }
// }
//
// Thus, this directive produces multiple handlers, each with a different
// matcher because multiple consecutive handlers are necessary to support
// the common PHP use case. If this "common" config is not compatible
// with a user's PHP requirements, they can use a manual approach based
// on the example above to configure it precisely as they need.
//
// If a matcher is specified by the user, for example:
//
// php_fastcgi /subpath localhost:7777
//
// then the resulting handlers are wrapped in a subroute that uses the
// user's matcher as a prerequisite to enter the subroute. In other
// words, the directive's matcher is necessary, but not sufficient.
func parsePHPFastCGI(h httpcaddyfile.Helper) ([]httpcaddyfile.ConfigValue, error) {
if !h.Next() {
return nil, h.ArgErr()
}
// route to redirect to canonical path if index PHP file
redirMatcherSet := caddy.ModuleMap{
"file": h.JSON(fileserver.MatchFile{
TryFiles: []string{"{http.request.uri.path}/index.php"},
}),
"not": h.JSON(caddyhttp.MatchNot{
MatcherSetsRaw: []caddy.ModuleMap{
{
"path": h.JSON(caddyhttp.MatchPath{"*/"}),
},
},
}),
}
redirHandler := caddyhttp.StaticResponse{
StatusCode: caddyhttp.WeakString("308"),
Headers: http.Header{"Location": []string{"{http.request.uri.path}/"}},
}
redirRoute := caddyhttp.Route{
MatcherSetsRaw: []caddy.ModuleMap{redirMatcherSet},
HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(redirHandler, "handler", "static_response", nil)},
}
// route to rewrite to PHP index file
rewriteMatcherSet := caddy.ModuleMap{
"file": h.JSON(fileserver.MatchFile{
TryFiles: []string{"{http.request.uri.path}", "{http.request.uri.path}/index.php", "index.php"},
}),
}
rewriteHandler := rewrite.Rewrite{
URI: "{http.matchers.file.relative}",
}
rewriteRoute := caddyhttp.Route{
MatcherSetsRaw: []caddy.ModuleMap{rewriteMatcherSet},
HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(rewriteHandler, "handler", "rewrite", nil)},
}
// route to actually reverse proxy requests to PHP files;
// match only requests that are for PHP files
rpMatcherSet := caddy.ModuleMap{
"path": h.JSON([]string{"*.php"}),
}
// if the user specified a matcher token, use that
// matcher in a route that wraps both of our routes;
// either way, strip the matcher token and pass
// the remaining tokens to the unmarshaler so that
// we can gain the rest of the reverse_proxy syntax
userMatcherSet, err := h.ExtractMatcherSet()
if err != nil {
return nil, err
}
// set up the transport for FastCGI, and specifically PHP
fcgiTransport := Transport{SplitPath: []string{".php"}}
// create the reverse proxy handler which uses our FastCGI transport
rpHandler := &reverseproxy.Handler{
TransportRaw: caddyconfig.JSONModuleObject(fcgiTransport, "protocol", "fastcgi", nil),
}
// the rest of the config is specified by the user
// using the reverse_proxy directive syntax
// TODO: this can overwrite our fcgiTransport that we encoded and
// set on the rpHandler... even with a non-fastcgi transport!
err = rpHandler.UnmarshalCaddyfile(h.Dispenser)
if err != nil {
return nil, err
}
// create the final reverse proxy route which is
// conditional on matching PHP files
rpRoute := caddyhttp.Route{
MatcherSetsRaw: []caddy.ModuleMap{rpMatcherSet},
HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(rpHandler, "handler", "reverse_proxy", nil)},
}
subroute := caddyhttp.Subroute{
Routes: caddyhttp.RouteList{redirRoute, rewriteRoute, rpRoute},
}
// the user's matcher is a prerequisite for ours, so
// wrap ours in a subroute and return that
if userMatcherSet != nil {
return []httpcaddyfile.ConfigValue{
{
Class: "route",
Value: caddyhttp.Route{
MatcherSetsRaw: []caddy.ModuleMap{userMatcherSet},
HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(subroute, "handler", "subroute", nil)},
},
},
}, nil
}
// otherwise, return the literal subroute instead of
// individual routes, to ensure they stay together and
// are treated as a single unit, without necessarily
// creating an actual subroute in the output
return []httpcaddyfile.ConfigValue{
{
Class: "route",
Value: subroute,
},
}, nil
}
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