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cue.go
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cue.go
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package utils
import (
"fmt"
"cuelang.org/go/cue"
"cuelang.org/go/cue/cuecontext"
"cuelang.org/go/cue/errors"
"cuelang.org/go/cue/format"
"cuelang.org/go/encoding/json"
"cuelang.org/go/encoding/jsonschema"
"cuelang.org/go/encoding/yaml"
)
func Validate(schema cue.Value, value cue.Value) (bool, []errors.Error) {
var errs []errors.Error
uval := value.Unify(schema)
err := uval.Validate()
if err != nil {
cueErr := errors.Errors(err)
errs = append(errs, cueErr...)
}
// check for required fields
schema.Walk(func(v cue.Value) bool {
val := value.LookupPath(v.Path())
if !(val.Err() == nil && val.IsConcrete()) {
cueErr := errors.Errors(errors.New(fmt.Sprintf("%v is a required field", v.Path().String())))
errs = append(errs, cueErr...)
}
return true
}, nil)
if len(errs) != 0 {
return false, errs
}
return true, make([]errors.Error, 0)
}
func GetNonConcreteFields(val cue.Value) []string {
res := make([]string, 0)
val.Walk(func(v cue.Value) bool {
if !v.IsConcrete() {
res = append(res, v.Path().String())
}
return true
}, nil)
return res
}
func JsonToCue(value []byte) (cue.Value, error) {
var out cue.Value
cuectx := cuecontext.New()
expr, err := json.Extract("", value)
if err != nil {
return out, ErrJsonToCue(err)
}
out = cuectx.BuildExpr(expr)
if out.Err() != nil {
return out, ErrJsonToCue(out.Err())
}
return out, nil
}
func YamlToCue(value string) (cue.Value, error) {
var out cue.Value
cuectx := cuecontext.New()
expr, err := yaml.Extract("", value)
if err != nil {
return out, ErrYamlToCue(err)
}
out = cuectx.BuildFile(expr)
if out.Err() != nil {
return out, ErrYamlToCue(out.Err())
}
return out, nil
}
func JsonSchemaToCue(value string) (cue.Value, error) {
var out cue.Value
jsonSchema, err := json.Extract("", []byte(value))
if err != nil {
return out, ErrJsonSchemaToCue(err)
}
cueCtx := cuecontext.New()
cueJsonSchemaExpr := cueCtx.BuildExpr(jsonSchema)
if err = cueJsonSchemaExpr.Err(); err != nil {
return out, ErrJsonSchemaToCue(err)
}
extractedSchema, err := jsonschema.Extract(cueJsonSchemaExpr, &jsonschema.Config{
PkgName: "jsonschemeconv",
})
if err != nil {
return out, ErrJsonSchemaToCue(err)
}
src, err := format.Node(extractedSchema)
if err != nil {
return out, ErrJsonSchemaToCue(err)
}
out = cueCtx.CompileString(string(src))
if out.Err() != nil {
return out, ErrJsonSchemaToCue(out.Err())
}
return out, nil
}
func Lookup(rootVal cue.Value, path string) (cue.Value, error) {
res := rootVal.LookupPath(cue.ParsePath(path))
if res.Err() != nil {
return res, ErrCueLookup(res.Err())
}
if !res.Exists() {
return res, ErrCueLookup(fmt.Errorf("Could not find the value at the path: %s", path))
}
return res.Value(), nil
}