8465579594

Committed 28 Mar 2024 10:03AM UTC coverage: 68.339% (-0.3%) from 68.666%

Build # 8465579594

Build Type

Pull #163

github

Committed by

0x19

Commit Message

Introducing log, tx decoder including fixes for constructor

Pull Request Pull Request #163: Bytecode package: Log, Tx decoder incl. fixes for contract

Run Details

4 of 185 new or added lines in 4 files covered. (2.16%)

2 existing lines in 1 file now uncovered.

26677 of 39036 relevant lines covered (68.34%)

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78.89

/bytecode/metadata.go

package bytecode

import (
        "bytes"
        "errors"
        "fmt"
        "strconv"
        "strings"

        "github.com/fxamacker/cbor/v2"
        "github.com/mr-tron/base58"
        metadata_pb "github.com/unpackdev/protos/dist/go/metadata"
)

// Metadata represents the metadata contained in Ethereum contract creation bytecode.
// The structure and encoding of the metadata is defined by the Solidity compiler.
// More information can be found at https://docs.soliditylang.org/en/v0.8.20/metadata.html#encoding-of-the-metadata-hash-in-the-bytecode
type Metadata struct {
        executionBytecode []byte      // The execution bytecode of the contract
        cborLength        int16       // The length of the CBOR metadata
        auxbytes          []byte      // The raw CBOR metadata
        Ipfs              []byte      `cbor:"ipfs"`         // The IPFS hash of the metadata, if present
        Bzzr1             []byte      `cbor:"bzzr1"`        // The Swarm hash of the metadata, if present (version 1)
        Bzzr0             []byte      `cbor:"bzzr0"`        // The Swarm hash of the metadata, if present (version 0)
        Experimental      interface{} `cbor:"experimental"` // Experimental metadata, if present
        Solc              []byte      `cbor:"solc"`         // The version of the Solidity compiler used
}

// ToProto converts the Metadata instance into a protobuf representation, suitable for
// serialization and transmission across different systems or networks.
func (m *Metadata) ToProto() *metadata_pb.BytecodeMetadata {
        return &metadata_pb.BytecodeMetadata{
                ExecutionBytecode: m.executionBytecode,
                CborLength:        uint32(m.cborLength),
                Raw:               m.auxbytes,
                Ipfs:              m.GetIPFS(),
                Bzzr1:             m.GetBzzr1(),
                Bzzr0:             m.GetBzzr0(),
                Experimental:      m.GetExperimental(),
                Solc:              m.GetCompilerVersion(),
                Solgo:             "", // TODO: Solgo version should be appended...
        }
}

// GetCompilerVersion returns the version of the Solidity compiler used to compile the contract.
func (m *Metadata) GetCompilerVersion() string {
        s := make([]string, 0, len(m.Solc))
        for _, i := range m.Solc {
                s = append(s, strconv.Itoa(int(i)))
        }
        return strings.Join(s, ".")
}

// GetExperimental returns whether the contract includes experimental metadata.
func (m *Metadata) GetExperimental() bool {
        if experimental, ok := m.Experimental.(string); ok {
                toReturn, err := strconv.ParseBool(experimental)
                if err != nil {
                        return false
                }
                return toReturn
        }

        if experimental, ok := m.Experimental.(bool); ok {
                return experimental
        }

        return false
}

// GetIPFS returns the IPFS hash of the contract's metadata, if present.
func (m *Metadata) GetIPFS() string {
        return fmt.Sprintf("ipfs://%s", base58.Encode(m.Ipfs))
}

// GetBzzr0 returns the Swarm (version 0) hash of the contract's metadata, if present.
func (m *Metadata) GetBzzr0() string {
        return fmt.Sprintf("bzz://%s", base58.Encode(m.Bzzr0))
}

// GetBzzr1 returns the Swarm (version 1) hash of the contract's metadata, if present.
func (m *Metadata) GetBzzr1() string {
        return fmt.Sprintf("bzz://%s", base58.Encode(m.Bzzr1))
}

// GetExecutionBytecode returns the execution bytecode of the contract.
func (m *Metadata) GetExecutionBytecode() []byte {
        return m.executionBytecode
}

// GetAuxBytecode returns the raw CBOR metadata of the contract.
func (m *Metadata) GetAuxBytecode() []byte {
        return m.auxbytes
}

// GetCborLength returns the length of the CBOR metadata.
func (m *Metadata) GetCborLength() int16 {
        return m.cborLength
}

// AuxFound returns whether the CBOR metadata bytes are contained in the provided byte slice.
// This is used to verify if contract extracted cbor metadata can be found in the deployed/execution contract bytecode.
func (m *Metadata) AuxFound(b []byte) bool {
        return bytes.Contains(b, m.auxbytes)
}

// GetUrls returns the URLs of the contract's metadata.
func (m *Metadata) GetUrls() []string {
        urls := make([]string, 0)
        if len(m.GetIPFS()) > 7 {
                urls = append(urls, m.GetIPFS())
        }
        if len(m.GetBzzr0()) > 6 {
                urls = append(urls, m.GetBzzr1())
        }
        if len(m.GetBzzr1()) > 6 {
                urls = append(urls, m.GetBzzr0())
        }
        return urls
}

// DecodeContractMetadata decodes the metadata from Ethereum contract creation bytecode.
// It returns a Metadata object and an error, if any occurred during decoding.
func DecodeContractMetadata(bytecode []byte) (*Metadata, error) {
        if len(bytecode) == 0 {
                return nil, errors.New("provided bytecode slice is empty")
        }

        toReturn := Metadata{}

        // Per solidity docs, last two bytes of the bytecode are the length of the cbor object
        bytesLength := 2

        // Take latest 2 bytes of the bytecode (length of the cbor object)
        cborLength := int(bytecode[len(bytecode)-2])<<8 | int(bytecode[len(bytecode)-1])
        toReturn.cborLength = int16(cborLength)

        // If the length of the cbor is more or equal to the length of the execution bytecode, it means there is no cbor
        if len(bytecode)-bytesLength <= 0 {
                return nil, errors.New("provided bytecode slice does not contain cbor metadata")
        }

        // Split the bytecode into execution bytecode and auxdata
        if len(bytecode) >= bytesLength+cborLength {
                toReturn.executionBytecode = bytecode[:len(bytecode)-bytesLength-cborLength]
                toReturn.auxbytes = bytecode[len(bytecode)-bytesLength-cborLength : len(bytecode)-bytesLength]
                if err := cbor.Unmarshal(toReturn.auxbytes, &toReturn); err != nil {
                        return nil, err
                }
        } else {
                return nil, errors.New("provided bytecode slice is smaller than the length of the cbor object")
        }

        return &toReturn, nil
}

1	package bytecode
2
3	import (
4	"bytes"
5	"errors"
6	"fmt"
7	"strconv"
8	"strings"
9
10	"github.com/fxamacker/cbor/v2"
11	"github.com/mr-tron/base58"
12	metadata_pb "github.com/unpackdev/protos/dist/go/metadata"
13	)
14
15	// Metadata represents the metadata contained in Ethereum contract creation bytecode.
16	// The structure and encoding of the metadata is defined by the Solidity compiler.
17	// More information can be found at https://docs.soliditylang.org/en/v0.8.20/metadata.html#encoding-of-the-metadata-hash-in-the-bytecode
18	type Metadata struct {
19	executionBytecode []byte // The execution bytecode of the contract
20	cborLength int16 // The length of the CBOR metadata
21	auxbytes []byte // The raw CBOR metadata
22	Ipfs []byte `cbor:"ipfs"` // The IPFS hash of the metadata, if present
23	Bzzr1 []byte `cbor:"bzzr1"` // The Swarm hash of the metadata, if present (version 1)
24	Bzzr0 []byte `cbor:"bzzr0"` // The Swarm hash of the metadata, if present (version 0)
25	Experimental interface{} `cbor:"experimental"` // Experimental metadata, if present
26	Solc []byte `cbor:"solc"` // The version of the Solidity compiler used
27	}
28
29	// ToProto converts the Metadata instance into a protobuf representation, suitable for
30	// serialization and transmission across different systems or networks.
31	func (m Metadata) ToProto() metadata_pb.BytecodeMetadata {	1✔
32	return &metadata_pb.BytecodeMetadata{	1✔
33	ExecutionBytecode: m.executionBytecode,	1✔
34	CborLength: uint32(m.cborLength),	1✔
35	Raw: m.auxbytes,	1✔
36	Ipfs: m.GetIPFS(),	1✔
37	Bzzr1: m.GetBzzr1(),	1✔
38	Bzzr0: m.GetBzzr0(),	1✔
39	Experimental: m.GetExperimental(),	1✔
40	Solc: m.GetCompilerVersion(),	1✔
41	Solgo: "", // TODO: Solgo version should be appended...	1✔
42	}	1✔
43	}	1✔
44
45	// GetCompilerVersion returns the version of the Solidity compiler used to compile the contract.
46	func (m *Metadata) GetCompilerVersion() string {	1✔
47	s := make([]string, 0, len(m.Solc))	1✔
48	for _, i := range m.Solc {	2✔
49	s = append(s, strconv.Itoa(int(i)))	1✔
50	}	1✔
51	return strings.Join(s, ".")	1✔
52	}
53
54	// GetExperimental returns whether the contract includes experimental metadata.
55	func (m *Metadata) GetExperimental() bool {	1✔
56	if experimental, ok := m.Experimental.(string); ok {	1✔
NEW 57	toReturn, err := strconv.ParseBool(experimental)	×
NEW 58	if err != nil {	×
NEW 59	return false	×
NEW 60	}	×
NEW 61	return toReturn	×
62	}
63
64	if experimental, ok := m.Experimental.(bool); ok {	1✔
NEW 65	return experimental	×
UNCOV 66	}	×
67
68	return false	1✔
69	}
70
71	// GetIPFS returns the IPFS hash of the contract's metadata, if present.
72	func (m *Metadata) GetIPFS() string {	1✔
73	return fmt.Sprintf("ipfs://%s", base58.Encode(m.Ipfs))	1✔
74	}	1✔
75
76	// GetBzzr0 returns the Swarm (version 0) hash of the contract's metadata, if present.
77	func (m *Metadata) GetBzzr0() string {	1✔
78	return fmt.Sprintf("bzz://%s", base58.Encode(m.Bzzr0))	1✔
79	}	1✔
80
81	// GetBzzr1 returns the Swarm (version 1) hash of the contract's metadata, if present.
82	func (m *Metadata) GetBzzr1() string {	1✔
83	return fmt.Sprintf("bzz://%s", base58.Encode(m.Bzzr1))	1✔
84	}	1✔
85
86	// GetExecutionBytecode returns the execution bytecode of the contract.
87	func (m *Metadata) GetExecutionBytecode() []byte {	1✔
88	return m.executionBytecode	1✔
89	}	1✔
90
91	// GetAuxBytecode returns the raw CBOR metadata of the contract.
92	func (m *Metadata) GetAuxBytecode() []byte {	1✔
93	return m.auxbytes	1✔
94	}	1✔
95
96	// GetCborLength returns the length of the CBOR metadata.
97	func (m *Metadata) GetCborLength() int16 {	1✔
98	return m.cborLength	1✔
99	}	1✔
100
101	// AuxFound returns whether the CBOR metadata bytes are contained in the provided byte slice.
102	// This is used to verify if contract extracted cbor metadata can be found in the deployed/execution contract bytecode.
103	func (m *Metadata) AuxFound(b []byte) bool {	×
104	return bytes.Contains(b, m.auxbytes)	×
105	}	×
106
107	// GetUrls returns the URLs of the contract's metadata.
108	func (m *Metadata) GetUrls() []string {	1✔
109	urls := make([]string, 0)	1✔
110	if len(m.GetIPFS()) > 7 {	2✔
111	urls = append(urls, m.GetIPFS())	1✔
112	}	1✔
113	if len(m.GetBzzr0()) > 6 {	1✔
114	urls = append(urls, m.GetBzzr1())	×
115	}	×
116	if len(m.GetBzzr1()) > 6 {	1✔
117	urls = append(urls, m.GetBzzr0())	×
118	}	×
119	return urls	1✔
120	}
121
122	// DecodeContractMetadata decodes the metadata from Ethereum contract creation bytecode.
123	// It returns a Metadata object and an error, if any occurred during decoding.
124	func DecodeContractMetadata(bytecode []byte) (*Metadata, error) {	1✔
125	if len(bytecode) == 0 {	2✔
126	return nil, errors.New("provided bytecode slice is empty")	1✔
127	}	1✔
128
129	toReturn := Metadata{}	1✔
130		1✔
131	// Per solidity docs, last two bytes of the bytecode are the length of the cbor object	1✔
132	bytesLength := 2	1✔
133		1✔
134	// Take latest 2 bytes of the bytecode (length of the cbor object)	1✔
135	cborLength := int(bytecode[len(bytecode)-2])<<8 \| int(bytecode[len(bytecode)-1])	1✔
136	toReturn.cborLength = int16(cborLength)	1✔
137		1✔
138	// If the length of the cbor is more or equal to the length of the execution bytecode, it means there is no cbor	1✔
139	if len(bytecode)-bytesLength <= 0 {	2✔
140	return nil, errors.New("provided bytecode slice does not contain cbor metadata")	1✔
141	}	1✔
142
143	// Split the bytecode into execution bytecode and auxdata
144	if len(bytecode) >= bytesLength+cborLength {	2✔
145	toReturn.executionBytecode = bytecode[:len(bytecode)-bytesLength-cborLength]	1✔
146	toReturn.auxbytes = bytecode[len(bytecode)-bytesLength-cborLength : len(bytecode)-bytesLength]	1✔
147	if err := cbor.Unmarshal(toReturn.auxbytes, &toReturn); err != nil {	1✔
UNCOV 148	return nil, err	×
149	}	×
150	} else {	×
151	return nil, errors.New("provided bytecode slice is smaller than the length of the cbor object")	×
152	}	×
153
154	return &toReturn, nil	1✔
155	}

unpackdev / solgo / 8465579594

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