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validation_mapping.go
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/
validation_mapping.go
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// Copyright 2019 Aporeto Inc.
// 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 spec
import (
"bytes"
"fmt"
"io"
"os"
"sort"
"github.com/xeipuuv/gojsonschema"
"go.aporeto.io/regolithe/schema"
yaml "gopkg.in/yaml.v2"
)
// A ValidationMap represent a single ValidationMap.
type ValidationMap struct {
Name string `yaml:"name,omitempty" json:"name,omitempty"`
Import string `yaml:"import,omitempty" json:"import,omitempty"`
}
// ValidationMapping holds the mapping of the validation function.
type ValidationMapping map[string]map[string]*ValidationMap
// NewValidationMapping returns a new ValidationMapping.
func NewValidationMapping() ValidationMapping {
return ValidationMapping{}
}
// LoadValidationMapping loads a ValidationMapping from the given ini file.
func LoadValidationMapping(path string) (ValidationMapping, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close() // nolint: errcheck
vm := NewValidationMapping()
if err = vm.Read(file, true); err != nil {
return nil, err
}
return vm, nil
}
// Read loads a validation mapping from the given io.Reader
func (v ValidationMapping) Read(reader io.Reader, validate bool) (err error) {
decoder := yaml.NewDecoder(reader)
decoder.SetStrict(true)
if err = decoder.Decode(&v); err != nil {
return err
}
if validate {
if errs := v.Validate(); len(errs) != 0 {
return formatValidationErrors(errs)
}
}
return nil
}
// Write dumps the specification into a []byte.
func (v ValidationMapping) Write(writer io.Writer) error {
repr := yaml.MapSlice{}
keys := make([]string, len(v))
var i int
for k := range v {
keys[i] = k
i++
}
sort.Strings(keys)
for _, k := range keys {
repr = append(repr, yaml.MapItem{
Key: k,
Value: v[k],
})
}
data, err := yaml.Marshal(repr)
if err != nil {
return err
}
buf := &bytes.Buffer{}
lines := bytes.Split(data, []byte("\n"))
for i, line := range lines {
condFirstLine := i == 0
if !condFirstLine && len(line) > 0 && line[0] != ' ' {
buf.WriteRune('\n')
}
buf.Write(line)
if i+1 < len(lines) {
buf.WriteRune('\n')
}
}
_, err = writer.Write(buf.Bytes())
return err
}
// Mapping returns the ValidationMap for the given external type.
func (v ValidationMapping) Mapping(mode string, functionName string) (mapping *ValidationMap, err error) {
m, ok := v[functionName]
if !ok {
return nil, fmt.Errorf("no function '%s' found in type mapping mode %s", functionName, mode)
}
return m[mode], nil
}
// Validate validates the type mappings against the schema.
func (v ValidationMapping) Validate() []error {
schemaData, err := schema.Asset("rego-validation-mapping.json")
if err != nil {
return []error{err}
}
schemaLoader := gojsonschema.NewBytesLoader(schemaData)
specLoader := gojsonschema.NewGoLoader(v)
res, err := gojsonschema.Validate(schemaLoader, specLoader)
if err != nil {
return []error{err}
}
if !res.Valid() {
return makeSchemaValidationError("_validation.mapping", res.Errors())
}
return nil
}