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// Copyright 2017 Google LLC. All Rights Reserved.
//
// 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 compiler
import (
"bytes"
"fmt"
"os/exec"
"strings"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/anypb"
yaml "gopkg.in/yaml.v3"
extensions "github.com/google/gnostic-models/extensions"
)
// ExtensionHandler describes a binary that is called by the compiler to handle specification extensions.
type ExtensionHandler struct {
Name string
}
// CallExtension calls a binary extension handler.
func CallExtension(context *Context, in *yaml.Node, extensionName string) (handled bool, response *anypb.Any, err error) {
if context == nil || context.ExtensionHandlers == nil {
return false, nil, nil
}
handled = false
for _, handler := range *(context.ExtensionHandlers) {
response, err = handler.handle(in, extensionName)
if response == nil {
continue
} else {
handled = true
break
}
}
return handled, response, err
}
func (extensionHandlers *ExtensionHandler) handle(in *yaml.Node, extensionName string) (*anypb.Any, error) {
if extensionHandlers.Name != "" {
yamlData, _ := yaml.Marshal(in)
request := &extensions.ExtensionHandlerRequest{
CompilerVersion: &extensions.Version{
Major: 0,
Minor: 1,
Patch: 0,
},
Wrapper: &extensions.Wrapper{
Version: "unknown", // TODO: set this to the type/version of spec being parsed.
Yaml: string(yamlData),
ExtensionName: extensionName,
},
}
requestBytes, _ := proto.Marshal(request)
cmd := exec.Command(extensionHandlers.Name)
cmd.Stdin = bytes.NewReader(requestBytes)
output, err := cmd.Output()
if err != nil {
return nil, err
}
response := &extensions.ExtensionHandlerResponse{}
err = proto.Unmarshal(output, response)
if err != nil || !response.Handled {
return nil, err
}
if len(response.Errors) != 0 {
return nil, fmt.Errorf("Errors when parsing: %+v for field %s by vendor extension handler %s. Details %+v", in, extensionName, extensionHandlers.Name, strings.Join(response.Errors, ","))
}
return response.Value, nil
}
return nil, nil
}
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