119 lines
3.1 KiB
Go
119 lines
3.1 KiB
Go
// Copyright 2016 The Linux Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package schema
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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"github.com/xeipuuv/gojsonschema"
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)
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// Validator wraps a media type string identifier
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// and implements validation against a JSON schema.
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type Validator string
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type validateDescendantsFunc func(r io.Reader) error
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var mapValidateDescendants = map[Validator]validateDescendantsFunc{
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MediaTypeManifest: validateManifestDescendants,
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}
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// ValidationError contains all the errors that happened during validation.
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type ValidationError struct {
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Errs []error
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}
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func (e ValidationError) Error() string {
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return fmt.Sprintf("%v", e.Errs)
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}
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// Validate validates the given reader against the schema of the wrapped media type.
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func (v Validator) Validate(src io.Reader) error {
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buf, err := ioutil.ReadAll(src)
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if err != nil {
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return errors.Wrap(err, "unable to read the document file")
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}
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if f, ok := mapValidateDescendants[v]; ok {
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if f == nil {
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return fmt.Errorf("internal error: mapValidateDescendents[%q] is nil", v)
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}
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err = f(bytes.NewReader(buf))
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if err != nil {
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return err
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}
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}
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sl := gojsonschema.NewReferenceLoaderFileSystem("file:///"+specs[v], fs)
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ml := gojsonschema.NewStringLoader(string(buf))
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result, err := gojsonschema.Validate(sl, ml)
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if err != nil {
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return errors.Wrapf(
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WrapSyntaxError(bytes.NewReader(buf), err),
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"schema %s: unable to validate", v)
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}
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if result.Valid() {
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return nil
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}
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errs := make([]error, 0, len(result.Errors()))
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for _, desc := range result.Errors() {
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errs = append(errs, fmt.Errorf("%s", desc))
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}
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return ValidationError{
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Errs: errs,
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}
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}
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type unimplemented string
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func (v unimplemented) Validate(src io.Reader) error {
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return fmt.Errorf("%s: unimplemented", v)
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}
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func validateManifestDescendants(r io.Reader) error {
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header := v1.Manifest{}
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buf, err := ioutil.ReadAll(r)
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if err != nil {
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return errors.Wrapf(err, "error reading the io stream")
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}
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err = json.Unmarshal(buf, &header)
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if err != nil {
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return errors.Wrap(err, "manifest format mismatch")
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}
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if header.Config.MediaType != string(v1.MediaTypeImageConfig) {
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fmt.Printf("warning: config %s has an unknown media type: %s\n", header.Config.Digest, header.Config.MediaType)
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}
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for _, layer := range header.Layers {
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if layer.MediaType != string(v1.MediaTypeImageLayer) &&
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layer.MediaType != string(v1.MediaTypeImageLayerNonDistributable) {
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fmt.Printf("warning: layer %s has an unknown media type: %s\n", layer.Digest, layer.MediaType)
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}
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}
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return nil
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}
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