mirror of https://github.com/caddyserver/caddy.git
131 lines
4.1 KiB
Go
131 lines
4.1 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 caddyconfig
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import (
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"encoding/json"
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"fmt"
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"github.com/caddyserver/caddy/v2"
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)
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// Adapter is a type which can adapt a configuration to Caddy JSON.
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// It returns the results and any warnings, or an error.
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type Adapter interface {
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Adapt(body []byte, options map[string]interface{}) ([]byte, []Warning, error)
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}
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// Warning represents a warning or notice related to conversion.
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type Warning struct {
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File string `json:"file,omitempty"`
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Line int `json:"line,omitempty"`
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Directive string `json:"directive,omitempty"`
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Message string `json:"message,omitempty"`
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}
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// JSON encodes val as JSON, returning it as a json.RawMessage. Any
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// marshaling errors (which are highly unlikely with correct code)
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// are converted to warnings. This is convenient when filling config
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// structs that require a json.RawMessage, without having to worry
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// about errors.
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func JSON(val interface{}, warnings *[]Warning) json.RawMessage {
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b, err := json.Marshal(val)
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if err != nil {
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if warnings != nil {
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*warnings = append(*warnings, Warning{Message: err.Error()})
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}
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return nil
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}
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return b
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}
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// JSONModuleObject is like JSON(), except it marshals val into a JSON object
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// with an added key named fieldName with the value fieldVal. This is useful
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// for encoding module values where the module name has to be described within
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// the object by a certain key; for example, `"handler": "file_server"` for a
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// file server HTTP handler (fieldName="handler" and fieldVal="file_server").
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// The val parameter must encode into a map[string]interface{} (i.e. it must be
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// a struct or map). Any errors are converted into warnings.
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func JSONModuleObject(val interface{}, fieldName, fieldVal string, warnings *[]Warning) json.RawMessage {
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// encode to a JSON object first
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enc, err := json.Marshal(val)
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if err != nil {
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if warnings != nil {
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*warnings = append(*warnings, Warning{Message: err.Error()})
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}
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return nil
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}
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// then decode the object
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var tmp map[string]interface{}
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err = json.Unmarshal(enc, &tmp)
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if err != nil {
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if warnings != nil {
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*warnings = append(*warnings, Warning{Message: err.Error()})
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}
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return nil
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}
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// so we can easily add the module's field with its appointed value
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tmp[fieldName] = fieldVal
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// then re-marshal as JSON
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result, err := json.Marshal(tmp)
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if err != nil {
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if warnings != nil {
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*warnings = append(*warnings, Warning{Message: err.Error()})
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}
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return nil
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}
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return result
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}
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// RegisterAdapter registers a config adapter with the given name.
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// This should usually be done at init-time. It panics if the
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// adapter cannot be registered successfully.
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func RegisterAdapter(name string, adapter Adapter) {
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if _, ok := configAdapters[name]; ok {
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panic(fmt.Errorf("%s: already registered", name))
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}
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configAdapters[name] = adapter
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caddy.RegisterModule(adapterModule{name, adapter})
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}
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// GetAdapter returns the adapter with the given name,
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// or nil if one with that name is not registered.
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func GetAdapter(name string) Adapter {
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return configAdapters[name]
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}
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// adapterModule is a wrapper type that can turn any config
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// adapter into a Caddy module, which has the benefit of being
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// counted with other modules, even though they do not
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// technically extend the Caddy configuration structure.
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// See caddyserver/caddy#3132.
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type adapterModule struct {
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name string
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Adapter
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}
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func (am adapterModule) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: caddy.ModuleID("caddy.adapters." + am.name),
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New: func() caddy.Module { return am },
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}
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}
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var configAdapters = make(map[string]Adapter)
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