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builder.go
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/
builder.go
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package schemas
import (
"fmt"
"reflect"
"strings"
"github.com/aquasecurity/defsec/pkg/state"
"github.com/aquasecurity/trivy-policies/pkg/rego/convert"
)
type RawSchema struct {
Type string `json:"type"` // object
Properties map[string]Property `json:"properties,omitempty"`
Defs map[string]*Property `json:"definitions,omitempty"`
}
type Property struct {
Type string `json:"type,omitempty"`
Ref string `json:"$ref,omitempty"`
Properties map[string]Property `json:"properties,omitempty"`
Items *Property `json:"items,omitempty"`
}
type builder struct {
schema RawSchema
}
func Build() (*RawSchema, error) {
b := newBuilder()
inputValue := reflect.ValueOf(state.State{})
err := b.fromInput(inputValue)
if err != nil {
return nil, err
}
return &b.schema, nil
}
func newBuilder() *builder {
return &builder{
schema: RawSchema{
Properties: nil,
Defs: nil,
},
}
}
func (b *builder) fromInput(inputValue reflect.Value) error {
prop, err := b.readProperty("", nil, inputValue.Type(), 0)
if err != nil {
return err
}
if prop == nil {
return fmt.Errorf("property is nil")
}
b.schema.Properties = prop.Properties
b.schema.Type = prop.Type
return nil
}
func refName(name string, parent, t reflect.Type) string {
if t.Name() == "" { // inline struct
return sanitise(parent.PkgPath() + "." + parent.Name() + "." + name)
}
return sanitise(t.PkgPath() + "." + t.Name())
}
func sanitise(s string) string {
return strings.ReplaceAll(s, "/", ".")
}
func (b *builder) readProperty(name string, parent, inputType reflect.Type, indent int) (*Property, error) {
if inputType.Kind() == reflect.Ptr {
inputType = inputType.Elem()
}
switch inputType.String() {
case "types.Metadata", "types.Range", "types.Reference":
return nil, nil
}
if b.schema.Defs != nil {
_, ok := b.schema.Defs[refName(name, parent, inputType)]
if ok {
return &Property{
Type: "object",
Ref: "#/definitions/" + refName(name, parent, inputType),
}, nil
}
}
fmt.Println(strings.Repeat(" ", indent) + name)
switch kind := inputType.Kind(); kind {
case reflect.Struct:
return b.readStruct(name, parent, inputType, indent)
case reflect.Slice:
return b.readSlice(name, parent, inputType, indent)
case reflect.String:
return &Property{
Type: "string",
}, nil
case reflect.Int:
return &Property{
Type: "integer",
}, nil
case reflect.Bool:
return &Property{
Type: "boolean",
}, nil
case reflect.Float32, reflect.Float64:
return &Property{
Type: "number",
}, nil
}
switch inputType.Name() {
case "BoolValue":
return &Property{
Type: "object",
Properties: map[string]Property{
"value": {
Type: "boolean",
},
},
}, nil
case "IntValue":
return &Property{
Type: "object",
Properties: map[string]Property{
"value": {
Type: "integer",
},
},
}, nil
case "StringValue", "TimeValue", "BytesValue":
return &Property{
Type: "object",
Properties: map[string]Property{
"value": {
Type: "string",
},
},
}, nil
case "MapValue":
return &Property{
Type: "object",
Properties: map[string]Property{
"value": {
Type: "object",
},
},
}, nil
}
fmt.Printf("WARNING: unsupported type: %s (%s)\n", inputType.Name(), inputType)
return nil, nil
}
var converterInterface = reflect.TypeOf((*convert.Converter)(nil)).Elem()
func (b *builder) readStruct(name string, parent, inputType reflect.Type, indent int) (*Property, error) {
if b.schema.Defs == nil {
b.schema.Defs = map[string]*Property{}
}
def := &Property{
Type: "object",
Properties: map[string]Property{},
}
if parent != nil {
b.schema.Defs[refName(name, parent, inputType)] = def
}
if inputType.Implements(converterInterface) {
if inputType.Kind() == reflect.Ptr {
inputType = inputType.Elem()
}
returns := reflect.New(inputType).MethodByName("ToRego").Call(nil)
if err := b.readRego(def, name, parent, returns[0].Type(), returns[0].Interface(), indent); err != nil {
return nil, err
}
} else {
for i := 0; i < inputType.NumField(); i++ {
field := inputType.Field(i)
prop, err := b.readProperty(field.Name, inputType, field.Type, indent+1)
if err != nil {
return nil, err
}
if prop == nil {
continue
}
key := strings.ToLower(field.Name)
if key == "metadata" {
continue
}
def.Properties[key] = *prop
}
}
if parent == nil {
return def, nil
}
return &Property{
Type: "object",
Ref: "#/definitions/" + refName(name, parent, inputType),
}, nil
}
func (b *builder) readSlice(name string, parent, inputType reflect.Type, indent int) (*Property, error) {
items, err := b.readProperty(name, parent, inputType.Elem(), indent+1)
if err != nil {
return nil, err
}
prop := &Property{
Type: "array",
Items: items,
}
return prop, nil
}
func (b *builder) readRego(def *Property, name string, parent reflect.Type, typ reflect.Type, raw interface{}, indent int) error {
switch cast := raw.(type) {
case map[string]interface{}:
def.Type = "object"
for k, v := range cast {
child := &Property{
Properties: map[string]Property{},
}
if err := b.readRego(child, k, reflect.TypeOf(raw), reflect.TypeOf(v), v, indent+1); err != nil {
return err
}
def.Properties[k] = *child
}
case map[string]string:
def.Type = "object"
for k, v := range cast {
child := &Property{
Properties: map[string]Property{},
}
if err := b.readRego(child, k, reflect.TypeOf(raw), reflect.TypeOf(v), v, indent+1); err != nil {
return err
}
def.Properties[k] = *child
}
default:
prop, err := b.readProperty(name, parent, typ, indent)
if err != nil {
return err
}
*def = *prop
}
return nil
}