mirror of
https://github.com/caddyserver/caddy.git
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229 lines
7 KiB
Go
229 lines
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 fastcgi
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import (
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"encoding/json"
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"net/http"
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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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// }
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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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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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// @canonicalPath {
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// file {
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// try_files {path}/index.php
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// }
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// not {
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// path */
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// }
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// }
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// redir @canonicalPath {path}/ 308
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//
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// try_files {path} {path}/index.php index.php
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//
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// @phpFiles {
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// path *.php
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// }
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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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// 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}/index.php"},
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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("308"),
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Headers: http.Header{"Location": []string{"{http.request.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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// 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: []string{"{http.request.uri.path}", "{http.request.uri.path}/index.php", "index.php"},
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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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// 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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rpMatcherSet := caddy.ModuleMap{
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"path": h.JSON([]string{"*.php"}),
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}
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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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// set up the transport for FastCGI, and specifically PHP
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fcgiTransport := Transport{SplitPath: []string{".php"}}
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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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// TODO: this can overwrite our fcgiTransport that we encoded and
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// set on the rpHandler... even with a non-fastcgi transport!
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err = rpHandler.UnmarshalCaddyfile(h.Dispenser)
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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: caddyhttp.RouteList{redirRoute, rewriteRoute, 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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