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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 caddyfile
import (
"bytes"
"encoding/json"
"fmt"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/caddyconfig"
)
// Adapter adapts Caddyfile to Caddy JSON.
type Adapter struct {
ServerType ServerType
}
// Adapt converts the Caddyfile config in body to Caddy JSON.
func (a Adapter) Adapt(body []byte, options map[string]interface{}) ([]byte, []caddyconfig.Warning, error) {
if a.ServerType == nil {
return nil, nil, fmt.Errorf("no server type")
}
if options == nil {
options = make(map[string]interface{})
}
filename, _ := options["filename"].(string)
if filename == "" {
filename = "Caddyfile"
}
serverBlocks, err := Parse(filename, body)
if err != nil {
return nil, nil, err
}
cfg, warnings, err := a.ServerType.Setup(serverBlocks, options)
if err != nil {
return nil, warnings, err
}
// lint check: see if input was properly formatted; sometimes messy files files parse
// successfully but result in logical errors (the Caddyfile is a bad format, I'm sorry)
if warning, different := formattingDifference(filename, body); different {
warnings = append(warnings, warning)
}
result, err := json.Marshal(cfg)
return result, warnings, err
}
// formattingDifference returns a warning and true if the formatted version
// is any different from the input; empty warning and false otherwise.
// TODO: also perform this check on imported files
func formattingDifference(filename string, body []byte) (caddyconfig.Warning, bool) {
formatted := Format(body)
if bytes.Equal(formatted, body) {
return caddyconfig.Warning{}, false
}
// find where the difference is
line := 1
for i, ch := range body {
if i >= len(formatted) || ch != formatted[i] {
break
}
if ch == '\n' {
line++
}
}
return caddyconfig.Warning{
File: filename,
Line: line,
Message: "input is not formatted with 'caddy fmt'",
}, true
}
// Unmarshaler is a type that can unmarshal
// Caddyfile tokens to set itself up for a
// JSON encoding. The goal of an unmarshaler
// is not to set itself up for actual use,
// but to set itself up for being marshaled
// into JSON. Caddyfile-unmarshaled values
// will not be used directly; they will be
// encoded as JSON and then used from that.
// Implementations must be able to support
// multiple segments (instances of their
// directive or batch of tokens); typically
// this means wrapping all token logic in
// a loop: `for d.Next() { ... }`.
type Unmarshaler interface {
UnmarshalCaddyfile(d *Dispenser) error
}
// ServerType is a type that can evaluate a Caddyfile and set up a caddy config.
type ServerType interface {
// Setup takes the server blocks which
// contain tokens, as well as options
// (e.g. CLI flags) and creates a Caddy
// config, along with any warnings or
// an error.
Setup([]ServerBlock, map[string]interface{}) (*caddy.Config, []caddyconfig.Warning, error)
}
// UnmarshalModule instantiates a module with the given ID and invokes
// UnmarshalCaddyfile on the new value using the immediate next segment
// of d as input. In other words, d's next token should be the first
// token of the module's Caddyfile input.
//
// This function is used when the next segment of Caddyfile tokens
// belongs to another Caddy module. The returned value is often
// type-asserted to the module's associated type for practical use
// when setting up a config.
func UnmarshalModule(d *Dispenser, moduleID string) (Unmarshaler, error) {
mod, err := caddy.GetModule(moduleID)
if err != nil {
return nil, d.Errf("getting module named '%s': %v", moduleID, err)
}
inst := mod.New()
unm, ok := inst.(Unmarshaler)
if !ok {
return nil, d.Errf("module %s is not a Caddyfile unmarshaler; is %T", mod.ID, inst)
}
err = unm.UnmarshalCaddyfile(d.NewFromNextSegment())
if err != nil {
return nil, err
}
return unm, nil
}
// Interface guard
var _ caddyconfig.Adapter = (*Adapter)(nil)
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