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// Copyright 2020 CUE 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 encoding
import (
"net/url"
"path"
"strings"
"cuelang.org/go/cue"
"cuelang.org/go/cue/build"
)
// Detect detects the interpretation.
func Detect(v cue.Value) (i build.Interpretation) {
switch {
case isOpenAPI(v):
return build.OpenAPI
case isJSONSchema(v):
return build.JSONSchema
}
return i
}
func isOpenAPI(v cue.Value) bool {
s, _ := v.LookupPath(cue.MakePath(cue.Str("openapi"))).String()
if !strings.HasPrefix(s, "3.") {
return false
}
if _, err := v.LookupPath(cue.MakePath(cue.Str("info"), cue.Str("title"))).String(); err != nil {
return false
}
if _, err := v.LookupPath(cue.MakePath(cue.Str("info"), cue.Str("version"))).String(); err != nil {
return false
}
return true
}
func isJSONSchema(v cue.Value) bool {
s, err := v.LookupPath(cue.MakePath(cue.Str("$schema"))).String()
if err != nil {
return false
}
u, err := url.Parse(s)
if err != nil {
return false
}
if u.Hostname() != "json-schema.org" {
return false
}
if _, base := path.Split(u.EscapedPath()); base != "schema" {
return false
}
return true
}
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