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contracts, swarm: implement EIP-1577 (ethereum#19285)
* contracts/ens: update public resolver solidity code * contracts/ens: update public resolver, update go bindings * update build * fix ens.sol * contracts/ens: change contract interface * contracts/ens: implement public resolver changes * contracts/ens: added ENSRegistry contract * contracts/ens: reinstate old contract code * contracts/ens: update README.md * contracts/ens: added test coverage for fallback contract * contracts/ens: added support for fallback contract * contracts/ens: removed unused contract code * contracts/ens: add todo and decode multicodec stub * add encode * vendor: add ipfs cid libraries * contracts/ens: cid sanity tests * contracts/ens: more cid sanity checks * contracts/ens: wip integration * wip * Revert "vendor: add ipfs cid libraries" This reverts commit 29d9b6b. * contracts/ens: removed multiformats dependencies * contracts/ens: added decode tests * contracts/ens: added eip spec test, minor changes to exiting tests * contracts/ens: moved cid decoding to own file * contracts/ens: added unit test to encode hash to content hash * contracts/ens: removed unused code * contracts/ens: fix ens tests to use cid decode and encode * contracts/ens: adjust swarm multicodecs after pr merge * contracts/ens: fix linter error * constracts/ens: address PR comments * cmd, contracts: make peoples lives easier * contracts/ens: fix linter error * contracts/ens: address PR comments
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| // Copyright 2016 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 ens | ||
|
|
||
| import ( | ||
| "encoding/binary" | ||
| "errors" | ||
| "fmt" | ||
|
|
||
| "github.com/ethereum/go-ethereum/common" | ||
| ) | ||
|
|
||
| const ( | ||
| cidv1 = 0x1 | ||
|
|
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| nsIpfs = 0xe3 | ||
| nsSwarm = 0xe4 | ||
|
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| swarmTypecode = 0xfa //swarm manifest, see https://github.com/multiformats/multicodec/blob/master/table.csv | ||
| swarmHashtype = 0xd6 // BMT, see https://github.com/multiformats/multicodec/blob/master/table.csv | ||
|
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| hashLength = 32 | ||
| ) | ||
|
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||
| // deocodeEIP1577ContentHash decodes a chain-stored content hash from an ENS record according to EIP-1577 | ||
| // a successful decode will result the different parts of the content hash in accordance to the CID spec | ||
| // Note: only CIDv1 is supported | ||
| func decodeEIP1577ContentHash(buf []byte) (storageNs, contentType, hashType, hashLength uint64, hash []byte, err error) { | ||
| if len(buf) < 10 { | ||
| return 0, 0, 0, 0, nil, errors.New("buffer too short") | ||
| } | ||
|
|
||
| storageNs, n := binary.Uvarint(buf) | ||
|
|
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| buf = buf[n:] | ||
| vers, n := binary.Uvarint(buf) | ||
|
|
||
| if vers != 1 { | ||
| return 0, 0, 0, 0, nil, fmt.Errorf("expected cid v1, got: %d", vers) | ||
| } | ||
| buf = buf[n:] | ||
| contentType, n = binary.Uvarint(buf) | ||
|
|
||
| buf = buf[n:] | ||
| hashType, n = binary.Uvarint(buf) | ||
|
|
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| buf = buf[n:] | ||
| hashLength, n = binary.Uvarint(buf) | ||
|
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| hash = buf[n:] | ||
|
|
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| if len(hash) != int(hashLength) { | ||
| return 0, 0, 0, 0, nil, errors.New("hash length mismatch") | ||
| } | ||
| return storageNs, contentType, hashType, hashLength, hash, nil | ||
| } | ||
|
|
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| func extractContentHash(buf []byte) (common.Hash, error) { | ||
| storageNs, _ /*contentType*/, _ /* hashType*/, decodedHashLength, hashBytes, err := decodeEIP1577ContentHash(buf) | ||
|
|
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| if err != nil { | ||
| return common.Hash{}, err | ||
| } | ||
|
|
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| if storageNs != nsSwarm { | ||
| return common.Hash{}, errors.New("unknown storage system") | ||
| } | ||
|
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| //todo: for the time being we implement loose enforcement for the EIP rules until ENS manager is updated | ||
| /*if contentType != swarmTypecode { | ||
| return common.Hash{}, errors.New("unknown content type") | ||
| } | ||
| if hashType != swarmHashtype { | ||
| return common.Hash{}, errors.New("unknown multihash type") | ||
| }*/ | ||
|
|
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| if decodedHashLength != hashLength { | ||
| return common.Hash{}, errors.New("odd hash length, swarm expects 32 bytes") | ||
| } | ||
|
|
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| if len(hashBytes) != int(hashLength) { | ||
| return common.Hash{}, errors.New("hash length mismatch") | ||
| } | ||
|
|
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| return common.BytesToHash(buf), nil | ||
| } | ||
|
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| func EncodeSwarmHash(hash common.Hash) ([]byte, error) { | ||
| var cidBytes []byte | ||
| var headerBytes = []byte{ | ||
| nsSwarm, //swarm namespace | ||
| cidv1, // CIDv1 | ||
| swarmTypecode, // swarm hash | ||
| swarmHashtype, // swarm bmt hash | ||
| hashLength, //hash length. 32 bytes | ||
| } | ||
|
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| varintbuf := make([]byte, binary.MaxVarintLen64) | ||
| for _, v := range headerBytes { | ||
| n := binary.PutUvarint(varintbuf, uint64(v)) | ||
| cidBytes = append(cidBytes, varintbuf[:n]...) | ||
| } | ||
|
|
||
| cidBytes = append(cidBytes, hash[:]...) | ||
| return cidBytes, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| // Copyright 2016 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 ens | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "testing" | ||
|
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| "github.com/ethereum/go-ethereum/common" | ||
| ) | ||
|
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| // Tests for the decoding of the example ENS | ||
| func TestEIPSpecCidDecode(t *testing.T) { | ||
| const ( | ||
| eipSpecHash = "e3010170122029f2d17be6139079dc48696d1f582a8530eb9805b561eda517e22a892c7e3f1f" | ||
| eipHash = "29f2d17be6139079dc48696d1f582a8530eb9805b561eda517e22a892c7e3f1f" | ||
| dagPb = 0x70 | ||
| sha2256 = 0x12 | ||
| ) | ||
| b, err := hex.DecodeString(eipSpecHash) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| hashBytes, err := hex.DecodeString(eipHash) | ||
|
|
||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
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||
| storageNs, contentType, hashType, hashLength, decodedHashBytes, err := decodeEIP1577ContentHash(b) | ||
|
|
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| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if storageNs != nsIpfs { | ||
| t.Fatal("wrong ns") | ||
| } | ||
| if contentType != dagPb { | ||
| t.Fatal("should be ipfs typecode") | ||
| } | ||
| if hashType != sha2256 { | ||
| t.Fatal("should be sha2-256") | ||
| } | ||
| if hashLength != 32 { | ||
| t.Fatal("should be 32") | ||
| } | ||
| if !bytes.Equal(hashBytes, decodedHashBytes) { | ||
| t.Fatal("should be equal") | ||
| } | ||
|
|
||
| } | ||
| func TestManualCidDecode(t *testing.T) { | ||
| // call cid encode method with hash. expect byte slice returned, compare according to spec | ||
|
|
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| for _, v := range []struct { | ||
| name string | ||
| headerBytes []byte | ||
| wantErr bool | ||
| }{ | ||
| { | ||
| name: "values correct, should not fail", | ||
| headerBytes: []byte{0xe4, 0x01, 0xfa, 0xd6, 0x20}, | ||
| wantErr: false, | ||
| }, | ||
| { | ||
| name: "cid version wrong, should fail", | ||
| headerBytes: []byte{0xe4, 0x00, 0xfa, 0xd6, 0x20}, | ||
| wantErr: true, | ||
| }, | ||
| { | ||
| name: "hash length wrong, should fail", | ||
| headerBytes: []byte{0xe4, 0x01, 0xfa, 0xd6, 0x1f}, | ||
| wantErr: true, | ||
| }, | ||
| { | ||
| name: "values correct for ipfs, should fail", | ||
| headerBytes: []byte{0xe3, 0x01, 0x70, 0x12, 0x20}, | ||
| wantErr: true, | ||
| }, | ||
| { | ||
| name: "loose values for swarm, todo remove, should not fail", | ||
| headerBytes: []byte{0xe4, 0x01, 0x70, 0x12, 0x20}, | ||
| wantErr: false, | ||
| }, | ||
| { | ||
| name: "loose values for swarm, todo remove, should not fail", | ||
| headerBytes: []byte{0xe4, 0x01, 0x99, 0x99, 0x20}, | ||
| wantErr: false, | ||
| }, | ||
| } { | ||
| t.Run(v.name, func(t *testing.T) { | ||
| const eipHash = "29f2d17be6139079dc48696d1f582a8530eb9805b561eda517e22a892c7e3f1f" | ||
|
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| var bb []byte | ||
| buf := make([]byte, binary.MaxVarintLen64) | ||
| for _, vv := range v.headerBytes { | ||
| n := binary.PutUvarint(buf, uint64(vv)) | ||
| bb = append(bb, buf[:n]...) | ||
| } | ||
|
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| h := common.HexToHash(eipHash) | ||
| bb = append(bb, h[:]...) | ||
| str := hex.EncodeToString(bb) | ||
| fmt.Println(str) | ||
| decodedHash, e := extractContentHash(bb) | ||
| switch v.wantErr { | ||
| case true: | ||
| if e == nil { | ||
| t.Fatal("the decode should fail") | ||
| } | ||
| case false: | ||
| if e != nil { | ||
| t.Fatalf("the deccode shouldnt fail: %v", e) | ||
| } | ||
| if !bytes.Equal(decodedHash[:], h[:]) { | ||
| t.Fatal("hashes not equal") | ||
| } | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
|
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| func TestManuelCidEncode(t *testing.T) { | ||
| // call cid encode method with hash. expect byte slice returned, compare according to spec | ||
| const eipHash = "29f2d17be6139079dc48696d1f582a8530eb9805b561eda517e22a892c7e3f1f" | ||
| cidBytes, err := EncodeSwarmHash(common.HexToHash(eipHash)) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
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| // logic in extractContentHash is unit tested thoroughly | ||
| // hence we just check that the returned hash is equal | ||
| h, err := extractContentHash(cidBytes) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
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| if bytes.Equal(h[:], cidBytes) { | ||
| t.Fatal("should be equal") | ||
| } | ||
| } |
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