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parse.go
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parse.go
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// Copyright 2022 Snyk Ltd
//
// 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 schemas
import (
"archive/zip"
"bytes"
"encoding/json"
"io/ioutil"
"strings"
)
type schema struct {
TypeName string `json:"typeName"`
Properties map[string]property `json:"properties"`
Definitions map[string]property `json:"definitions"`
}
type property struct {
Ref string `json:"$ref"`
Type interface{} `json:"type"` // String or array of string
Properties map[string]property `json:"properties"`
Items *property `json:"items"`
}
func (p property) isRef() bool {
return p.Ref != ""
}
func (p property) getRef() string {
return strings.TrimPrefix(p.Ref, "#/definitions/")
}
func (p property) getType() (Type, bool) {
if str, ok := p.Type.(string); ok {
switch str {
case "boolean":
return Boolean, true
case "integer":
return Integer, true
case "number":
return Number, true
case "string":
return String, true
case "array":
return Array, true
case "object":
return Object, true
}
}
return Object, false
}
// Conversion of schemas as they are in CloudformationSchema.zip to the above
// type.
func (schema schema) convert() *Schema {
// Declare definitions first so they can be reused.
definitions := map[string]*Schema{}
for key := range schema.Definitions {
definitions[key] = &Schema{}
}
// Property conversion resolves references in `Definitions`.
var convertProperty func(property) *Schema
convertProperty = func(prop property) *Schema {
if prop.isRef() {
if def, ok := definitions[prop.getRef()]; ok {
return def
} else {
return nil
}
} else {
out := Schema{}
if ty, ok := prop.getType(); ok {
out.Type = ty
} else {
return nil
}
if len(prop.Properties) > 0 {
out.Properties = map[string]*Schema{}
for k, v := range prop.Properties {
out.Properties[k] = convertProperty(v)
}
}
if prop.Items != nil {
out.Items = convertProperty(*prop.Items)
}
return &out
}
}
// Convert definitions.
for k, def := range definitions {
if out := convertProperty(schema.Definitions[k]); out != nil {
def.Type = out.Type
def.Properties = out.Properties
def.Items = out.Items
}
}
// Convert properties.
properties := map[string]*Schema{}
for key, prop := range schema.Properties {
properties[key] = convertProperty(prop)
}
// Return schema.
return &Schema{
Type: Object,
Properties: properties,
}
}
func parseSchemasFromZip(zipbytes []byte) ([]schema, error) {
schemas := []schema{}
r, err := zip.NewReader(bytes.NewReader(zipbytes), int64(len(zipbytes)))
if err != nil {
return nil, err
}
for _, f := range r.File {
rc, err := f.Open()
if err != nil {
return nil, err
}
body, err := ioutil.ReadAll(rc)
if err != nil {
return nil, err
}
rc.Close()
var schema schema
err = json.Unmarshal(body, &schema)
if err != nil {
return nil, err
}
schemas = append(schemas, schema)
}
return schemas, nil
}