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This commit is contained in:
julian 2023-10-17 14:55:07 -06:00
parent ee88cd8fb0
commit 24c9561257
1 changed files with 13 additions and 35 deletions
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48
lib/services/coins/bitcoincash/cashtokens.dart
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@ -1,6 +1,4 @@
import 'dart:typed_data';
import 'package:hex/hex.dart';
import 'package:convert/convert.dart';
// The Structure enum
enum Structure {
@ -25,8 +23,6 @@ class CompactSizeResult {
CompactSizeResult({required this.amount, required this.bytesRead});
}
// This class is a data structure representing the entire output, comprised of both the
// normal Script pub key and the token data. We get this after we parse/unwrap the raw
// output.
@ -36,7 +32,6 @@ class ParsedOutput {
ParsedOutput({this.script_pub_key, this.token_data});
}
// This is equivalent to the Electron Cash python's "OutputData" in token.py.
// Named here specifically as "TokenOutputData" to reflect the fact that
// it is specifically for tokens, whereas the other class ParsedOutput represents
@ -55,7 +50,6 @@ class TokenOutputData {
this.bitfield,
});
// Get the "capability", see Capability enum.
int getCapability() {
if (bitfield != null) {
@ -86,7 +80,6 @@ class TokenOutputData {
return false;
}
// Functions to return specific attributes based on the Capability.
bool isMintingNFT() {
return hasNFT() && getCapability() == Capability.Minting.index;
@ -100,7 +93,6 @@ class TokenOutputData {
return hasNFT() && getCapability() == Capability.NoCapability.index;
}
// This function validates if the bitfield makes sense or violates known rules/logic.
bool isValidBitfield() {
if (bitfield == null) {
@ -126,21 +118,17 @@ class TokenOutputData {
return true;
}
// The serialze and deserialize functions are the nuts and bolts of how we unpack
// and pack outputs. These are called by the wrap and unwrap functions.
int deserialize(Uint8List buffer, {int cursor = 0, bool strict = false}) {
try {
this.id = buffer.sublist(cursor, cursor + 32);
cursor += 32;
this.bitfield = Uint8List.fromList([buffer[cursor]]);
cursor += 1;
if (this.hasCommitmentLength()) {
// Read the first byte to determine the length of the commitment data
int commitmentLength = buffer[cursor];
@ -156,34 +144,30 @@ class TokenOutputData {
this.commitment = null;
}
if (this.hasAmount()) {
// Use readCompactSize that returns CompactSizeResult
CompactSizeResult result = readCompactSize(buffer, cursor, strict: strict);
CompactSizeResult result =
readCompactSize(buffer, cursor, strict: strict);
this.amount = result.amount;
cursor += result.bytesRead;
} else {
this.amount = 0;
}
if (!this.isValidBitfield() ||
(this.hasAmount() && this.amount == 0) ||
(this.amount! < 0 || this.amount! > (1 << 63) - 1) ||
(this.hasCommitmentLength() && this.commitment!.isEmpty) ||
(this.amount! == 0 && !this.hasNFT())
) {
(this.amount! == 0 && !this.hasNFT())) {
throw Exception('Unable to parse token data or token data is invalid');
}
return cursor; // Return the number of bytes read
return cursor; // Return the number of bytes read
} catch (e) {
throw Exception('Deserialization failed: $e');
}
}
// Serialize method
Uint8List serialize() {
var buffer = BytesBuilder();
@ -204,9 +188,7 @@ class TokenOutputData {
return buffer.toBytes();
}
} //END OF OUTPUTDATA CLASS
} //END OF OUTPUTDATA CLASS
// The prefix byte is specified by the CashTokens spec.
final List<int> PREFIX_BYTE = [0xef];
@ -232,9 +214,7 @@ ParsedOutput wrap_spk(TokenOutputData? token_data, Uint8List script_pub_key) {
return parsedOutput;
}
// This function unwraps any output, either "normal" (containing no token data)
// This function unwraps any output, either "normal" (containing no token data)
// or an output with token data. If no token data, just the output is returned,
// and if token data exists, both the output and token data are returned.
// Note that the data returend in both cases in of ParsedOutput type, which
@ -242,13 +222,11 @@ ParsedOutput wrap_spk(TokenOutputData? token_data, Uint8List script_pub_key) {
ParsedOutput unwrap_spk(Uint8List wrapped_spk) {
ParsedOutput parsedOutput = ParsedOutput();
if (wrapped_spk.isEmpty || wrapped_spk[0] != PREFIX_BYTE[0]) {
parsedOutput.script_pub_key = wrapped_spk;
return parsedOutput;
}
int read_cursor = 1; // Start after the PREFIX_BYTE
TokenOutputData token_data = TokenOutputData();
@ -256,14 +234,12 @@ ParsedOutput unwrap_spk(Uint8List wrapped_spk) {
try {
// Deserialize updates read_cursor by the number of bytes read
wrapped_spk_without_prefix_byte= wrapped_spk.sublist(read_cursor);
wrapped_spk_without_prefix_byte = wrapped_spk.sublist(read_cursor);
int bytesRead = token_data.deserialize(wrapped_spk_without_prefix_byte);
read_cursor += bytesRead;
parsedOutput.token_data = token_data;
parsedOutput.script_pub_key = wrapped_spk.sublist(read_cursor);
} catch (e) {
// If unable to deserialize, return all bytes as the full scriptPubKey
parsedOutput.script_pub_key = wrapped_spk;
@ -277,9 +253,11 @@ ParsedOutput unwrap_spk(Uint8List wrapped_spk) {
//These are part of a "length value " scheme where the length (and endianness) are given first
// and inform the program of how many bytes to grab next. These are in turn used by the serialize
// and deserialize functions.-
CompactSizeResult readCompactSize(Uint8List buffer, int cursor, {bool strict = false}) {
CompactSizeResult readCompactSize(
Uint8List buffer,
int cursor, {
bool strict = false,
}) {
int bytesRead = 0; // Variable to count bytes read
int val;
try {
@ -314,6 +292,7 @@ CompactSizeResult readCompactSize(Uint8List buffer, int cursor, {bool strict = f
throw Exception("attempt to read past end of buffer");
}
}
Uint8List writeCompactSize(int size) {
var buffer = ByteData(9); // Maximum needed size for compact size is 9 bytes
if (size < 0) {
@ -336,4 +315,3 @@ Uint8List writeCompactSize(int size) {
throw Exception("Size too large to represent as CompactSize");
}
}