1 files changed, 0 insertions, 187 deletions
diff --git a/swarm/storage/mru/metadata.go b/swarm/storage/mru/metadata.go
deleted file mode 100644
index 509114895..000000000
--- a/swarm/storage/mru/metadata.go
+++ /dev/null
@@ -1,187 +0,0 @@
-// Copyright 2018 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package mru
-
-import (
-	"encoding/binary"
-	"hash"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/swarm/storage"
-)
-
-// ResourceMetadata encapsulates the immutable information about a mutable resource :)
-// once serialized into a chunk, the resource can be retrieved by knowing its content-addressed rootAddr
-type ResourceMetadata struct {
-	StartTime Timestamp      // time at which the resource starts to be valid
-	Frequency uint64         // expected update frequency for the resource
-	Name      string         // name of the resource, for the reference of the user or to disambiguate resources with same starttime, frequency, owneraddr
-	Owner     common.Address // public address of the resource owner
-}
-
-const frequencyLength = 8 // sizeof(uint64)
-const nameLengthLength = 1
-
-// Resource metadata chunk layout:
-// 4 prefix bytes (chunkPrefixLength). The first two set to zero. The second two indicate the length
-// Timestamp: timestampLength bytes
-// frequency: frequencyLength bytes
-// name length: nameLengthLength bytes
-// name (variable length, can be empty, up to 255 bytes)
-// ownerAddr: common.AddressLength
-const minimumMetadataLength = chunkPrefixLength + timestampLength + frequencyLength + nameLengthLength + common.AddressLength
-
-// binaryGet populates the resource metadata from a byte array
-func (r *ResourceMetadata) binaryGet(serializedData []byte) error {
-	if len(serializedData) < minimumMetadataLength {
-		return NewErrorf(ErrInvalidValue, "Metadata chunk to deserialize is too short. Expected at least %d. Got %d.", minimumMetadataLength, len(serializedData))
-	}
-
-	// first two bytes must be set to zero to indicate metadata chunks, so enforce this.
-	if serializedData[0] != 0 || serializedData[1] != 0 {
-		return NewError(ErrCorruptData, "Invalid metadata chunk")
-	}
-
-	cursor := 2
-	metadataLength := int(binary.LittleEndian.Uint16(serializedData[cursor : cursor+2])) // metadataLength does not include the 4 prefix bytes
-	if metadataLength+chunkPrefixLength != len(serializedData) {
-		return NewErrorf(ErrCorruptData, "Incorrect declared metadata length. Expected %d, got %d.", metadataLength+chunkPrefixLength, len(serializedData))
-	}
-
-	cursor += 2
-
-	if err := r.StartTime.binaryGet(serializedData[cursor : cursor+timestampLength]); err != nil {
-		return err
-	}
-	cursor += timestampLength
-
-	r.Frequency = binary.LittleEndian.Uint64(serializedData[cursor : cursor+frequencyLength])
-	cursor += frequencyLength
-
-	nameLength := int(serializedData[cursor])
-	if nameLength+minimumMetadataLength > len(serializedData) {
-		return NewErrorf(ErrInvalidValue, "Metadata chunk to deserialize is too short when decoding resource name. Expected at least %d. Got %d.", nameLength+minimumMetadataLength, len(serializedData))
-	}
-	cursor++
-	r.Name = string(serializedData[cursor : cursor+nameLength])
-	cursor += nameLength
-
-	copy(r.Owner[:], serializedData[cursor:])
-	cursor += common.AddressLength
-	if cursor != len(serializedData) {
-		return NewErrorf(ErrInvalidValue, "Metadata chunk has leftover data after deserialization. %d left to read", len(serializedData)-cursor)
-	}
-	return nil
-}
-
-// binaryPut encodes the metadata into a byte array
-func (r *ResourceMetadata) binaryPut(serializedData []byte) error {
-	metadataChunkLength := r.binaryLength()
-	if len(serializedData) != metadataChunkLength {
-		return NewErrorf(ErrInvalidValue, "Need a slice of exactly %d bytes to serialize this metadata, but got a slice of size %d.", metadataChunkLength, len(serializedData))
-	}
-
-	// root chunk has first two bytes both set to 0, which distinguishes from update bytes
-	// therefore, skip the first two bytes of a zero-initialized array.
-	cursor := 2
-	binary.LittleEndian.PutUint16(serializedData[cursor:cursor+2], uint16(metadataChunkLength-chunkPrefixLength)) // metadataLength does not include the 4 prefix bytes
-	cursor += 2
-
-	r.StartTime.binaryPut(serializedData[cursor : cursor+timestampLength])
-	cursor += timestampLength
-
-	binary.LittleEndian.PutUint64(serializedData[cursor:cursor+frequencyLength], r.Frequency)
-	cursor += frequencyLength
-
-	// Encode the name string as a 1 byte length followed by the encoded string.
-	// Longer strings will be truncated.
-	nameLength := len(r.Name)
-	if nameLength > 255 {
-		nameLength = 255
-	}
-	serializedData[cursor] = uint8(nameLength)
-	cursor++
-	copy(serializedData[cursor:cursor+nameLength], []byte(r.Name[:nameLength]))
-	cursor += nameLength
-
-	copy(serializedData[cursor:cursor+common.AddressLength], r.Owner[:])
-	cursor += common.AddressLength
-
-	return nil
-}
-
-func (r *ResourceMetadata) binaryLength() int {
-	return minimumMetadataLength + len(r.Name)
-}
-
-// serializeAndHash returns the root chunk addr and metadata hash that help identify and ascertain ownership of this resource
-// returns the serialized metadata as a byproduct of having to hash it.
-func (r *ResourceMetadata) serializeAndHash() (rootAddr, metaHash []byte, chunkData []byte, err error) {
-
-	chunkData = make([]byte, r.binaryLength())
-	if err := r.binaryPut(chunkData); err != nil {
-		return nil, nil, nil, err
-	}
-	rootAddr, metaHash = metadataHash(chunkData)
-	return rootAddr, metaHash, chunkData, nil
-
-}
-
-// creates a metadata chunk out of a resourceMetadata structure
-func (metadata *ResourceMetadata) newChunk() (chunk storage.Chunk, metaHash []byte, err error) {
-	// the metadata chunk contains a timestamp of when the resource starts to be valid
-	// and also how frequently it is expected to be updated
-	// from this we know at what time we should look for updates, and how often
-	// it also contains the name of the resource, so we know what resource we are working with
-
-	// the key (rootAddr) of the metadata chunk is content-addressed
-	// if it wasn't we couldn't replace it later
-	// resolving this relationship is left up to external agents (for example ENS)
-	rootAddr, metaHash, chunkData, err := metadata.serializeAndHash()
-	if err != nil {
-		return nil, nil, err
-	}
-
-	// make the chunk and send it to swarm
-	chunk = storage.NewChunk(rootAddr, chunkData)
-
-	return chunk, metaHash, nil
-}
-
-// metadataHash returns the metadata chunk root address and metadata hash
-// that help identify and ascertain ownership of this resource
-// We compute it as rootAddr = H(ownerAddr, H(metadata))
-// Where H() is SHA3
-// metadata are all the metadata fields, except ownerAddr
-// ownerAddr is the public address of the resource owner
-// Update chunks must carry a rootAddr reference and metaHash in order to be verified
-// This way, a node that receives an update can check the signature, recover the public address
-// and check the ownership by computing H(ownerAddr, metaHash) and comparing it to the rootAddr
-// the resource is claiming to update without having to lookup the metadata chunk.
-// see verifyResourceOwnerhsip in signedupdate.go
-func metadataHash(chunkData []byte) (rootAddr, metaHash []byte) {
-	hasher := hashPool.Get().(hash.Hash)
-	defer hashPool.Put(hasher)
-	hasher.Reset()
-	hasher.Write(chunkData[:len(chunkData)-common.AddressLength])
-	metaHash = hasher.Sum(nil)
-	hasher.Reset()
-	hasher.Write(metaHash)
-	hasher.Write(chunkData[len(chunkData)-common.AddressLength:])
-	rootAddr = hasher.Sum(nil)
-	return
-}