mirror of https://github.com/perkeep/perkeep.git
112 lines
2.5 KiB
Go
112 lines
2.5 KiB
Go
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/*
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Copyright 2013 Google Inc.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package schema
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import (
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"encoding/json"
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"strings"
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"camlistore.org/pkg/blobref"
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)
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// AnyBlob represents any type of schema blob.
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type AnyBlob interface {
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Blob() *Blob
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}
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// Buildable returns a Builder from a base.
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type Buildable interface {
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Builder() *Builder
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}
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// A Blob represents a Camlistore schema blob.
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// It is immutable.
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type Blob struct {
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br *blobref.BlobRef
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str string
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ss *Superset
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}
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// Type returns the blob's "camliType" field.
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func (b *Blob) Type() string { return b.ss.Type }
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// BlobRef returns the schema blob's blobref.
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func (b *Blob) BlobRef() *blobref.BlobRef { return b.br }
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// JSON returns the JSON bytes of the schema blob.
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func (b *Blob) JSON() string { return b.str }
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func (b *Blob) Blob() *Blob { return b }
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func (b *Blob) Builder() *Builder {
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return b.jsonMap().Builder()
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}
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func (b *Blob) jsonMap() Map {
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var m map[string]interface{}
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err := json.Unmarshal([]byte(b.str), &m)
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if err != nil {
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panic("failed to decode previously-thought-valid Blob's JSON: " + err.Error())
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}
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return m
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}
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// MapToBlob is a transitional function to ease the migration from schema.Map to *schema.Blob.
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// TODO(bradfitz): delete.
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func MapToBlob(m Map) *Blob {
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json, err := m.JSON()
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if err != nil {
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panic(err)
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}
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ss, err := ParseSuperset(strings.NewReader(json))
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if err != nil {
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panic(err)
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}
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h := blobref.NewHash()
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h.Write([]byte(json))
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return &Blob{
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str: json,
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ss: ss,
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br: blobref.FromHash(h),
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}
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}
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// A Claim is a Blob that is signed.
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type Claim struct {
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b *Blob
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}
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// Blob returns the claim's Blob.
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func (c Claim) Blob() *Blob { return c.b }
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// A Builder builds a JSON blob.
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// After mutating the Builder, call Blob to get the built blob.
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type Builder struct {
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m map[string]interface{}
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}
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// Blob builds the Blob. The builder continues to be usable after a call to Build.
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func (b *Builder) Blob() *Blob {
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return MapToBlob(b.m)
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}
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func (b *Builder) SetSigner(signer *blobref.BlobRef) *Builder {
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b.m["camliSigner"] = signer.String()
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return b
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}
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