Differential D11626 Diff 34354 web/cashtab/src/utils/cashMethods.js

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web/cashtab/src/utils/cashMethods.js

Show First 20 Lines • Show All 81 Lines • ▼ Show 20 Lines	try {
}		}
} catch (err) {		} catch (err) {
console.log('Error in parseXecSendValue: ' + err);		console.log('Error in parseXecSendValue: ' + err);
throw err;		throw err;
}		}
return value;		return value;
};		};

		/*
		* Generates an OP_RETURN script to reflect the various send XEC permutations
		* involving messaging, encryption, eToken IDs and airdrop flags.
		*
		* Returns the final encoded script object
		*/
		export const generateOpReturnScript = (
		BCH,
		optionalOpReturnMsg,
		encryptionFlag,
		airdropFlag,
		airdropTokenId,
		encryptedEj,
		) => {
		// encrypted mesage is mandatory when encryptionFlag is true
		// airdrop token id is mandatory when airdropFlag is true
		if (
		!BCH \|\|
		(encryptionFlag && !encryptedEj) \|\|
		(airdropFlag && !airdropTokenId)
		) {
		throw new Error('Invalid OP RETURN script input');
		}

		// Note: script.push(Buffer.from(currency.opReturn.opReturnPrefixHex, 'hex')); actually evaluates to '016a'
		// instead of keeping the hex string intact. This behavour is specific to the initial script array element.
		// To get around this, the bch-js approach of directly using the opReturn prefix in decimal form for the initial entry is used here.
		let script = [currency.opReturn.opReturnPrefixDec]; // initialize script with the OP_RETURN op code (6a) in decimal form (106)

		try {
		if (encryptionFlag) {
		// if the user has opted to encrypt this message

		// add the encrypted cashtab messaging prefix and encrypted msg to script
		script.push(
		Buffer.from(
		currency.opReturn.appPrefixesHex.cashtabEncrypted,
		'hex',
		), // 65746162
		);

		// add the encrypted message to script
		script.push(Buffer.from(encryptedEj));
		} else {
		// this is an un-encrypted message

		if (airdropFlag) {
		// if this was routed from the airdrop component
		// add the airdrop prefix to script
		script.push(
		Buffer.from(
		currency.opReturn.appPrefixesHex.airdrop,
		'hex',
		), // drop
		);
		// add the airdrop token ID to script
		script.push(Buffer.from(airdropTokenId, 'hex'));
		}

		// add the cashtab prefix to script
		script.push(
		Buffer.from(currency.opReturn.appPrefixesHex.cashtab, 'hex'), // 00746162
		);

		// add the un-encrypted message to script if supplied
		if (optionalOpReturnMsg) {
		script.push(Buffer.from(optionalOpReturnMsg));
		}
		}
		} catch (err) {
		console.log('Error in generateOpReturnScript(): ' + err);
		throw err;
		}

		const data = BCH.Script.encode(script);
		return data;
		};

export function parseOpReturn(hexStr) {		export function parseOpReturn(hexStr) {
if (		if (
!hexStr \|\|		!hexStr \|\|
typeof hexStr !== 'string' \|\|		typeof hexStr !== 'string' \|\|
hexStr.substring(0, 2) !== currency.opReturn.opReturnPrefixHex		hexStr.substring(0, 2) !== currency.opReturn.opReturnPrefixHex
) {		) {
return false;		return false;
}		}
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