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hash.go
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/
hash.go
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/* Copyright 2020 PhysarumSM Development Team
*
* 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 util
import (
"context"
"os"
"github.com/ipfs/go-blockservice"
"github.com/ipfs/go-ipfs/core"
"github.com/ipfs/go-ipfs/core/coreunix"
"github.com/ipfs/go-ipfs-files"
dag "github.com/ipfs/go-merkledag"
dagtest "github.com/ipfs/go-merkledag/test"
"github.com/ipfs/go-mfs"
"github.com/ipfs/go-unixfs"
)
func IpfsHashBytes(data []byte) (hash string, err error) {
bytesFile := files.NewBytesFile(data)
return getIpfsHash(bytesFile)
}
func IpfsHashFile(path string) (hash string, err error) {
stat, err := os.Lstat(path)
if err != nil {
return "", err
}
fileNode, err := files.NewSerialFile(path, false, stat)
if err != nil {
return "", err
}
defer fileNode.Close()
return getIpfsHash(fileNode)
}
func getIpfsHash(fileNode files.Node) (hash string, err error) {
ctx := context.Background()
nilIpfsNode, err := core.NewNode(ctx, &core.BuildCfg{NilRepo: true})
if err != nil {
return "", err
}
bserv := blockservice.New(nilIpfsNode.Blockstore, nilIpfsNode.Exchange)
dserv := dag.NewDAGService(bserv)
fileAdder, err := coreunix.NewAdder(
ctx, nilIpfsNode.Pinning, nilIpfsNode.Blockstore, dserv)
if err != nil {
return "", err
}
fileAdder.Pin = false
fileAdder.CidBuilder = dag.V0CidPrefix()
mockDserv := dagtest.Mock()
emptyDirNode := unixfs.EmptyDirNode()
emptyDirNode.SetCidBuilder(fileAdder.CidBuilder)
mfsRoot, err := mfs.NewRoot(ctx, mockDserv, emptyDirNode, nil)
if err != nil {
return "", err
}
fileAdder.SetMfsRoot(mfsRoot)
dagIpldNode, err := fileAdder.AddAllAndPin(fileNode)
if err != nil {
return "", err
}
hash = dagIpldNode.String()
return hash, nil
}