78 lines
1.8 KiB
JavaScript
78 lines
1.8 KiB
JavaScript
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var findIndex = function (array, callback) {
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var end = false;
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var i = 0;
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for (; i < array.length && !end; i++) {
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end = callback(array[i]);
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}
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return end ? i - 1 : -1;
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};
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var padLeft = function (number, n) {
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return (new Array(n - number.toString.length + 1)).join("0") + number;
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};
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var setupTypes = function () {
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var prefixedType = function (prefix) {
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return function (type, value) {
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var expected = prefix;
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if (type.indexOf(expected) !== 0) {
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return false;
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}
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var padding = parseInt(type.slice(expected.length)) / 8;
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return padLeft(value, padding);
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};
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};
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var namedType = function (name, padding) {
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return function (type, value) {
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if (type !== name) {
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return false;
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}
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return padLeft(value, padding);
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};
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};
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return [
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prefixedType('uint'),
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prefixedType('int'),
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namedType('address', 20),
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namedType('bool', 1),
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];
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};
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var types = setupTypes();
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var toBytes = function (json, methodName, params) {
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var bytes = "";
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var index = findIndex(json, function (method) {
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return method.name === methodName;
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});
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if (index === -1) {
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return;
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}
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bytes = bytes + index + 'x';
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var method = json[index];
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for (var i = 0; i < method.inputs.length; i++) {
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var found = false;
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for (var j = 0; j < types.length && !found; j++) {
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found = types[j](method.inputs[i].type, params[i]);
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}
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if (!found) {
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console.error('unsupported json type: ' + method.inputs[i].type);
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}
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bytes += found;
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}
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return bytes;
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};
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module.exports = {
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toBytes: toBytes
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};
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