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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 httpcaddyfile
import (
"encoding/json"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
// defaultDirectiveOrder specifies the order
// to apply directives in HTTP routes.
// TODO: finish the ability to customize this
var defaultDirectiveOrder = []string{
"rewrite",
"try_files",
"headers",
"encode",
"templates",
"redir",
"static_response", // TODO: "reply" or "respond"?
"reverse_proxy",
"file_server",
}
// RegisterDirective registers a unique directive dir with an
// associated unmarshaling (setup) function. When directive dir
// is encountered in a Caddyfile, setupFunc will be called to
// unmarshal its tokens.
func RegisterDirective(dir string, setupFunc UnmarshalFunc) {
if _, ok := registeredDirectives[dir]; ok {
panic("directive " + dir + " already registered")
}
registeredDirectives[dir] = setupFunc
}
// RegisterHandlerDirective is like RegisterDirective, but for
// directives which specifically output only an HTTP handler.
func RegisterHandlerDirective(dir string, setupFunc UnmarshalHandlerFunc) {
RegisterDirective(dir, func(h Helper) ([]ConfigValue, error) {
if !h.Next() {
return nil, h.ArgErr()
}
matcherSet, ok, err := h.MatcherToken()
if err != nil {
return nil, err
}
if ok {
h.Dispenser.Delete() // strip matcher token
}
h.Dispenser.Reset() // pretend this lookahead never happened
val, err := setupFunc(h)
if err != nil {
return nil, err
}
return h.NewRoute(matcherSet, val), nil
})
}
// Helper is a type which helps setup a value from
// Caddyfile tokens.
type Helper struct {
*caddyfile.Dispenser
warnings *[]caddyconfig.Warning
matcherDefs map[string]map[string]json.RawMessage
parentBlock caddyfile.ServerBlock
}
// Caddyfiles returns the list of config files from
// which tokens in the current server block were loaded.
func (h Helper) Caddyfiles() []string {
// first obtain set of names of files involved
// in this server block, without duplicates
files := make(map[string]struct{})
for _, segment := range h.parentBlock.Segments {
for _, token := range segment {
files[token.File] = struct{}{}
}
}
// then convert the set into a slice
filesSlice := make([]string, 0, len(files))
for file := range files {
filesSlice = append(filesSlice, file)
}
return filesSlice
}
// JSON converts val into JSON. Any errors are added to warnings.
func (h Helper) JSON(val interface{}, warnings *[]caddyconfig.Warning) json.RawMessage {
return caddyconfig.JSON(val, h.warnings)
}
// MatcherToken assumes the current token is (possibly) a matcher, and
// if so, returns the matcher set along with a true value. If the current
// token is not a matcher, nil and false is returned. Note that a true
// value may be returned with a nil matcher set if it is a catch-all.
func (h Helper) MatcherToken() (map[string]json.RawMessage, bool, error) {
if !h.NextArg() {
return nil, false, nil
}
return matcherSetFromMatcherToken(h.Dispenser.Token(), h.matcherDefs, h.warnings)
}
// NewRoute returns config values relevant to creating a new HTTP route.
func (h Helper) NewRoute(matcherSet map[string]json.RawMessage,
handler caddyhttp.MiddlewareHandler) []ConfigValue {
mod, err := caddy.GetModule(caddy.GetModuleName(handler))
if err != nil {
// TODO: append to warnings
}
var matcherSetsRaw []map[string]json.RawMessage
if matcherSet != nil {
matcherSetsRaw = append(matcherSetsRaw, matcherSet)
}
return []ConfigValue{
{
Class: "route",
Value: caddyhttp.Route{
MatcherSetsRaw: matcherSetsRaw,
HandlersRaw: []json.RawMessage{caddyconfig.JSONModuleObject(handler, "handler", mod.ID(), h.warnings)},
},
},
}
}
// NewBindAddresses returns config values relevant to adding
// listener bind addresses to the config.
func (h Helper) NewBindAddresses(addrs []string) []ConfigValue {
return []ConfigValue{{Class: "bind", Value: addrs}}
}
// NewVarsRoute returns config values relevant to adding a
// "vars" wrapper route to the config.
func (h Helper) NewVarsRoute(route caddyhttp.Route) []ConfigValue {
return []ConfigValue{{Class: "var", Value: route}}
}
// ConfigValue represents a value to be added to the final
// configuration, or a value to be consulted when building
// the final configuration.
type ConfigValue struct {
// The kind of value this is. As the config is
// being built, the adapter will look in the
// "pile" for values belonging to a certain
// class when it is setting up a certain part
// of the config. The associated value will be
// type-asserted and placed accordingly.
Class string
// The value to be used when building the config.
// Generally its type is associated with the
// name of the Class.
Value interface{}
directive string
}
// serverBlock pairs a Caddyfile server block
// with a "pile" of config values, keyed by class
// name.
type serverBlock struct {
block caddyfile.ServerBlock
pile map[string][]ConfigValue // config values obtained from directives
}
type (
// UnmarshalFunc is a function which can unmarshal Caddyfile
// tokens into zero or more config values using a Helper type.
// These are passed in a call to RegisterDirective.
UnmarshalFunc func(h Helper) ([]ConfigValue, error)
// UnmarshalHandlerFunc is like UnmarshalFunc, except the
// output of the unmarshaling is an HTTP handler. This
// function does not need to deal with HTTP request matching
// which is abstracted away. Since writing HTTP handlers
// with Caddyfile support is very common, this is a more
// convenient way to add a handler to the chain since a lot
// of the details common to HTTP handlers are taken care of
// for you. These are passed to a call to
// RegisterHandlerDirective.
UnmarshalHandlerFunc func(h Helper) (caddyhttp.MiddlewareHandler, error)
)
var registeredDirectives = make(map[string]UnmarshalFunc)
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