mirror of
https://github.com/hoytech/strfry.git
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web wip
This commit is contained in:
Doug Hoyte
507
src/apps/web/static/base.ts
Normal file
507
src/apps/web/static/base.ts
Normal file
@ -0,0 +1,507 @@
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/*! scure-base - MIT License (c) 2022 Paul Miller (paulmillr.com) */
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// Utilities
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function assertNumber(n: number) {
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if (!Number.isSafeInteger(n)) throw new Error(`Wrong integer: ${n}`);
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}
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interface Coder<F, T> {
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encode(from: F): T;
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decode(to: T): F;
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}
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interface BytesCoder extends Coder<Uint8Array, string> {
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encode: (data: Uint8Array) => string;
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decode: (str: string) => Uint8Array;
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}
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// TODO: some recusive type inference so it would check correct order of input/output inside rest?
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// like <string, number>, <number, bytes>, <bytes, float>
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type Chain = [Coder<any, any>, ...Coder<any, any>[]];
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// Extract info from Coder type
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type Input<F> = F extends Coder<infer T, any> ? T : never;
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type Output<F> = F extends Coder<any, infer T> ? T : never;
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// Generic function for arrays
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type First<T> = T extends [infer U, ...any[]] ? U : never;
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type Last<T> = T extends [...any[], infer U] ? U : never;
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type Tail<T> = T extends [any, ...infer U] ? U : never;
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type AsChain<C extends Chain, Rest = Tail<C>> = {
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// C[K] = Coder<Input<C[K]>, Input<Rest[k]>>
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[K in keyof C]: Coder<Input<C[K]>, Input<K extends keyof Rest ? Rest[K] : any>>;
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};
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function chain<T extends Chain & AsChain<T>>(...args: T): Coder<Input<First<T>>, Output<Last<T>>> {
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// Wrap call in closure so JIT can inline calls
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const wrap = (a: any, b: any) => (c: any) => a(b(c));
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// Construct chain of args[-1].encode(args[-2].encode([...]))
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const encode = Array.from(args)
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.reverse()
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.reduce((acc, i: any) => (acc ? wrap(acc, i.encode) : i.encode), undefined) as any;
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// Construct chain of args[0].decode(args[1].decode(...))
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const decode = args.reduce(
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(acc, i: any) => (acc ? wrap(acc, i.decode) : i.decode),
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undefined
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) as any;
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return { encode, decode };
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}
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type Alphabet = string[] | string;
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// Encodes integer radix representation to array of strings using alphabet and back
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function alphabet(alphabet: Alphabet): Coder<number[], string[]> {
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return {
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encode: (digits: number[]) => {
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if (!Array.isArray(digits) || (digits.length && typeof digits[0] !== 'number'))
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throw new Error('alphabet.encode input should be an array of numbers');
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return digits.map((i) => {
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assertNumber(i);
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if (i < 0 || i >= alphabet.length)
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throw new Error(`Digit index outside alphabet: ${i} (alphabet: ${alphabet.length})`);
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return alphabet[i];
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});
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},
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decode: (input: string[]) => {
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if (!Array.isArray(input) || (input.length && typeof input[0] !== 'string'))
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throw new Error('alphabet.decode input should be array of strings');
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return input.map((letter) => {
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if (typeof letter !== 'string')
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throw new Error(`alphabet.decode: not string element=${letter}`);
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const index = alphabet.indexOf(letter);
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if (index === -1) throw new Error(`Unknown letter: "${letter}". Allowed: ${alphabet}`);
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return index;
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});
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},
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};
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}
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function join(separator = ''): Coder<string[], string> {
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if (typeof separator !== 'string') throw new Error('join separator should be string');
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return {
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encode: (from) => {
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if (!Array.isArray(from) || (from.length && typeof from[0] !== 'string'))
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throw new Error('join.encode input should be array of strings');
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for (let i of from)
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if (typeof i !== 'string') throw new Error(`join.encode: non-string input=${i}`);
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return from.join(separator);
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},
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decode: (to) => {
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if (typeof to !== 'string') throw new Error('join.decode input should be string');
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return to.split(separator);
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},
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};
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}
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// Pad strings array so it has integer number of bits
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function padding(bits: number, chr = '='): Coder<string[], string[]> {
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assertNumber(bits);
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if (typeof chr !== 'string') throw new Error('padding chr should be string');
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return {
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encode(data: string[]): string[] {
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if (!Array.isArray(data) || (data.length && typeof data[0] !== 'string'))
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throw new Error('padding.encode input should be array of strings');
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for (let i of data)
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if (typeof i !== 'string') throw new Error(`padding.encode: non-string input=${i}`);
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while ((data.length * bits) % 8) data.push(chr);
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return data;
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},
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decode(input: string[]): string[] {
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if (!Array.isArray(input) || (input.length && typeof input[0] !== 'string'))
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throw new Error('padding.encode input should be array of strings');
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for (let i of input)
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if (typeof i !== 'string') throw new Error(`padding.decode: non-string input=${i}`);
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let end = input.length;
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if ((end * bits) % 8)
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throw new Error('Invalid padding: string should have whole number of bytes');
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for (; end > 0 && input[end - 1] === chr; end--) {
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if (!(((end - 1) * bits) % 8))
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throw new Error('Invalid padding: string has too much padding');
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}
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return input.slice(0, end);
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},
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};
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}
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function normalize<T>(fn: (val: T) => T): Coder<T, T> {
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if (typeof fn !== 'function') throw new Error('normalize fn should be function');
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return { encode: (from: T) => from, decode: (to: T) => fn(to) };
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}
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// NOTE: it has quadratic time complexity
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function convertRadix(data: number[], from: number, to: number) {
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// base 1 is impossible
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if (from < 2) throw new Error(`convertRadix: wrong from=${from}, base cannot be less than 2`);
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if (to < 2) throw new Error(`convertRadix: wrong to=${to}, base cannot be less than 2`);
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if (!Array.isArray(data)) throw new Error('convertRadix: data should be array');
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if (!data.length) return [];
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let pos = 0;
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const res = [];
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const digits = Array.from(data);
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digits.forEach((d) => {
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assertNumber(d);
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if (d < 0 || d >= from) throw new Error(`Wrong integer: ${d}`);
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});
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while (true) {
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let carry = 0;
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let done = true;
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for (let i = pos; i < digits.length; i++) {
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const digit = digits[i];
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const digitBase = from * carry + digit;
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if (
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!Number.isSafeInteger(digitBase) ||
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(from * carry) / from !== carry ||
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digitBase - digit !== from * carry
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) {
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throw new Error('convertRadix: carry overflow');
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}
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carry = digitBase % to;
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digits[i] = Math.floor(digitBase / to);
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if (!Number.isSafeInteger(digits[i]) || digits[i] * to + carry !== digitBase)
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throw new Error('convertRadix: carry overflow');
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if (!done) continue;
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else if (!digits[i]) pos = i;
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else done = false;
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}
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res.push(carry);
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if (done) break;
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}
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for (let i = 0; i < data.length - 1 && data[i] === 0; i++) res.push(0);
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return res.reverse();
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}
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const gcd = (a: number, b: number): number => (!b ? a : gcd(b, a % b));
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const radix2carry = (from: number, to: number) => from + (to - gcd(from, to));
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// BigInt is 5x slower
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function convertRadix2(data: number[], from: number, to: number, padding: boolean): number[] {
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if (!Array.isArray(data)) throw new Error('convertRadix2: data should be array');
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if (from <= 0 || from > 32) throw new Error(`convertRadix2: wrong from=${from}`);
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if (to <= 0 || to > 32) throw new Error(`convertRadix2: wrong to=${to}`);
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if (radix2carry(from, to) > 32) {
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throw new Error(
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`convertRadix2: carry overflow from=${from} to=${to} carryBits=${radix2carry(from, to)}`
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);
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}
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let carry = 0;
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let pos = 0; // bitwise position in current element
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const mask = 2 ** to - 1;
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const res: number[] = [];
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for (const n of data) {
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assertNumber(n);
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if (n >= 2 ** from) throw new Error(`convertRadix2: invalid data word=${n} from=${from}`);
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carry = (carry << from) | n;
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if (pos + from > 32) throw new Error(`convertRadix2: carry overflow pos=${pos} from=${from}`);
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pos += from;
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for (; pos >= to; pos -= to) res.push(((carry >> (pos - to)) & mask) >>> 0);
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carry &= 2 ** pos - 1; // clean carry, otherwise it will cause overflow
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}
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carry = (carry << (to - pos)) & mask;
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if (!padding && pos >= from) throw new Error('Excess padding');
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if (!padding && carry) throw new Error(`Non-zero padding: ${carry}`);
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if (padding && pos > 0) res.push(carry >>> 0);
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return res;
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}
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function radix(num: number): Coder<Uint8Array, number[]> {
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assertNumber(num);
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return {
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encode: (bytes: Uint8Array) => {
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if (!(bytes instanceof Uint8Array))
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throw new Error('radix.encode input should be Uint8Array');
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return convertRadix(Array.from(bytes), 2 ** 8, num);
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},
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decode: (digits: number[]) => {
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if (!Array.isArray(digits) || (digits.length && typeof digits[0] !== 'number'))
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throw new Error('radix.decode input should be array of strings');
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return Uint8Array.from(convertRadix(digits, num, 2 ** 8));
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},
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};
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}
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// If both bases are power of same number (like `2**8 <-> 2**64`),
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// there is a linear algorithm. For now we have implementation for power-of-two bases only
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function radix2(bits: number, revPadding = false): Coder<Uint8Array, number[]> {
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assertNumber(bits);
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if (bits <= 0 || bits > 32) throw new Error('radix2: bits should be in (0..32]');
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if (radix2carry(8, bits) > 32 || radix2carry(bits, 8) > 32)
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throw new Error('radix2: carry overflow');
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return {
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encode: (bytes: Uint8Array) => {
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if (!(bytes instanceof Uint8Array))
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throw new Error('radix2.encode input should be Uint8Array');
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return convertRadix2(Array.from(bytes), 8, bits, !revPadding);
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},
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decode: (digits: number[]) => {
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if (!Array.isArray(digits) || (digits.length && typeof digits[0] !== 'number'))
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throw new Error('radix2.decode input should be array of strings');
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return Uint8Array.from(convertRadix2(digits, bits, 8, revPadding));
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},
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};
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}
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type ArgumentTypes<F extends Function> = F extends (...args: infer A) => any ? A : never;
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function unsafeWrapper<T extends (...args: any) => any>(fn: T) {
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if (typeof fn !== 'function') throw new Error('unsafeWrapper fn should be function');
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return function (...args: ArgumentTypes<T>): ReturnType<T> | undefined {
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try {
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return fn.apply(null, args);
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} catch (e) {}
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};
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}
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function checksum(
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len: number,
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fn: (data: Uint8Array) => Uint8Array
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): Coder<Uint8Array, Uint8Array> {
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assertNumber(len);
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if (typeof fn !== 'function') throw new Error('checksum fn should be function');
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return {
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encode(data: Uint8Array) {
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if (!(data instanceof Uint8Array))
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throw new Error('checksum.encode: input should be Uint8Array');
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const checksum = fn(data).slice(0, len);
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const res = new Uint8Array(data.length + len);
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res.set(data);
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res.set(checksum, data.length);
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return res;
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},
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decode(data: Uint8Array) {
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if (!(data instanceof Uint8Array))
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throw new Error('checksum.decode: input should be Uint8Array');
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const payload = data.slice(0, -len);
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const newChecksum = fn(payload).slice(0, len);
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const oldChecksum = data.slice(-len);
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for (let i = 0; i < len; i++)
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if (newChecksum[i] !== oldChecksum[i]) throw new Error('Invalid checksum');
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return payload;
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},
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};
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}
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const utils = { alphabet, chain, checksum, radix, radix2, join, padding };
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// RFC 4648 aka RFC 3548
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// ---------------------
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const base16: BytesCoder = chain(radix2(4), alphabet('0123456789ABCDEF'), join(''));
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const base32: BytesCoder = chain(
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radix2(5),
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alphabet('ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'),
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padding(5),
|
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join('')
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);
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const base32hex: BytesCoder = chain(
|
||||
radix2(5),
|
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alphabet('0123456789ABCDEFGHIJKLMNOPQRSTUV'),
|
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padding(5),
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join('')
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||||
);
|
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const base32crockford: BytesCoder = chain(
|
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radix2(5),
|
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alphabet('0123456789ABCDEFGHJKMNPQRSTVWXYZ'),
|
||||
join(''),
|
||||
normalize((s: string) => s.toUpperCase().replace(/O/g, '0').replace(/[IL]/g, '1'))
|
||||
);
|
||||
const base64: BytesCoder = chain(
|
||||
radix2(6),
|
||||
alphabet('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'),
|
||||
padding(6),
|
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join('')
|
||||
);
|
||||
const base64url: BytesCoder = chain(
|
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radix2(6),
|
||||
alphabet('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'),
|
||||
padding(6),
|
||||
join('')
|
||||
);
|
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const base64urlnopad: BytesCoder = chain(
|
||||
radix2(6),
|
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alphabet('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'),
|
||||
join('')
|
||||
);
|
||||
|
||||
// base58 code
|
||||
// -----------
|
||||
const genBase58 = (abc: string) => chain(radix(58), alphabet(abc), join(''));
|
||||
|
||||
const base58: BytesCoder = genBase58(
|
||||
'123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
|
||||
);
|
||||
const base58flickr: BytesCoder = genBase58(
|
||||
'123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ'
|
||||
);
|
||||
const base58xrp: BytesCoder = genBase58(
|
||||
'rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz'
|
||||
);
|
||||
|
||||
// xmr ver is done in 8-byte blocks (which equals 11 chars in decoding). Last (non-full) block padded with '1' to size in XMR_BLOCK_LEN.
|
||||
// Block encoding significantly reduces quadratic complexity of base58.
|
||||
|
||||
// Data len (index) -> encoded block len
|
||||
const XMR_BLOCK_LEN = [0, 2, 3, 5, 6, 7, 9, 10, 11];
|
||||
const base58xmr: BytesCoder = {
|
||||
encode(data: Uint8Array) {
|
||||
let res = '';
|
||||
for (let i = 0; i < data.length; i += 8) {
|
||||
const block = data.subarray(i, i + 8);
|
||||
res += base58.encode(block).padStart(XMR_BLOCK_LEN[block.length], '1');
|
||||
}
|
||||
return res;
|
||||
},
|
||||
decode(str: string) {
|
||||
let res: number[] = [];
|
||||
for (let i = 0; i < str.length; i += 11) {
|
||||
const slice = str.slice(i, i + 11);
|
||||
const blockLen = XMR_BLOCK_LEN.indexOf(slice.length);
|
||||
const block = base58.decode(slice);
|
||||
for (let j = 0; j < block.length - blockLen; j++) {
|
||||
if (block[j] !== 0) throw new Error('base58xmr: wrong padding');
|
||||
}
|
||||
res = res.concat(Array.from(block.slice(block.length - blockLen)));
|
||||
}
|
||||
return Uint8Array.from(res);
|
||||
},
|
||||
};
|
||||
|
||||
const base58check = (sha256: (data: Uint8Array) => Uint8Array): BytesCoder =>
|
||||
chain(
|
||||
checksum(4, (data) => sha256(sha256(data))),
|
||||
base58
|
||||
);
|
||||
|
||||
// Bech32 code
|
||||
// -----------
|
||||
interface Bech32Decoded {
|
||||
prefix: string;
|
||||
words: number[];
|
||||
}
|
||||
interface Bech32DecodedWithArray {
|
||||
prefix: string;
|
||||
words: number[];
|
||||
bytes: Uint8Array;
|
||||
}
|
||||
|
||||
const BECH_ALPHABET: Coder<number[], string> = chain(
|
||||
alphabet('qpzry9x8gf2tvdw0s3jn54khce6mua7l'),
|
||||
join('')
|
||||
);
|
||||
|
||||
const POLYMOD_GENERATORS = [0x3b6a57b2, 0x26508e6d, 0x1ea119fa, 0x3d4233dd, 0x2a1462b3];
|
||||
function bech32Polymod(pre: number): number {
|
||||
const b = pre >> 25;
|
||||
let chk = (pre & 0x1ffffff) << 5;
|
||||
for (let i = 0; i < POLYMOD_GENERATORS.length; i++) {
|
||||
if (((b >> i) & 1) === 1) chk ^= POLYMOD_GENERATORS[i];
|
||||
}
|
||||
return chk;
|
||||
}
|
||||
|
||||
function bechChecksum(prefix: string, words: number[], encodingConst = 1): string {
|
||||
const len = prefix.length;
|
||||
let chk = 1;
|
||||
for (let i = 0; i < len; i++) {
|
||||
const c = prefix.charCodeAt(i);
|
||||
if (c < 33 || c > 126) throw new Error(`Invalid prefix (${prefix})`);
|
||||
chk = bech32Polymod(chk) ^ (c >> 5);
|
||||
}
|
||||
chk = bech32Polymod(chk);
|
||||
for (let i = 0; i < len; i++) chk = bech32Polymod(chk) ^ (prefix.charCodeAt(i) & 0x1f);
|
||||
for (let v of words) chk = bech32Polymod(chk) ^ v;
|
||||
for (let i = 0; i < 6; i++) chk = bech32Polymod(chk);
|
||||
chk ^= encodingConst;
|
||||
return BECH_ALPHABET.encode(convertRadix2([chk % 2 ** 30], 30, 5, false));
|
||||
}
|
||||
|
||||
function genBech32(encoding: 'bech32' | 'bech32m') {
|
||||
const ENCODING_CONST = encoding === 'bech32' ? 1 : 0x2bc830a3;
|
||||
const _words = radix2(5);
|
||||
const fromWords = _words.decode;
|
||||
const toWords = _words.encode;
|
||||
const fromWordsUnsafe = unsafeWrapper(fromWords);
|
||||
|
||||
function encode(
|
||||
prefix: string,
|
||||
words: number[] | Uint8Array,
|
||||
limit: number | false = 90
|
||||
): string {
|
||||
if (typeof prefix !== 'string')
|
||||
throw new Error(`bech32.encode prefix should be string, not ${typeof prefix}`);
|
||||
if (!Array.isArray(words) || (words.length && typeof words[0] !== 'number'))
|
||||
throw new Error(`bech32.encode words should be array of numbers, not ${typeof words}`);
|
||||
const actualLength = prefix.length + 7 + words.length;
|
||||
if (limit !== false && actualLength > limit)
|
||||
throw new TypeError(`Length ${actualLength} exceeds limit ${limit}`);
|
||||
prefix = prefix.toLowerCase();
|
||||
return `${prefix}1${BECH_ALPHABET.encode(words)}${bechChecksum(prefix, words, ENCODING_CONST)}`;
|
||||
}
|
||||
|
||||
function decode(str: string, limit: number | false = 90): Bech32Decoded {
|
||||
if (typeof str !== 'string')
|
||||
throw new Error(`bech32.decode input should be string, not ${typeof str}`);
|
||||
if (str.length < 8 || (limit !== false && str.length > limit))
|
||||
throw new TypeError(`Wrong string length: ${str.length} (${str}). Expected (8..${limit})`);
|
||||
// don't allow mixed case
|
||||
const lowered = str.toLowerCase();
|
||||
if (str !== lowered && str !== str.toUpperCase())
|
||||
throw new Error(`String must be lowercase or uppercase`);
|
||||
str = lowered;
|
||||
const sepIndex = str.lastIndexOf('1');
|
||||
if (sepIndex === 0 || sepIndex === -1)
|
||||
throw new Error(`Letter "1" must be present between prefix and data only`);
|
||||
const prefix = str.slice(0, sepIndex);
|
||||
const _words = str.slice(sepIndex + 1);
|
||||
if (_words.length < 6) throw new Error('Data must be at least 6 characters long');
|
||||
const words = BECH_ALPHABET.decode(_words).slice(0, -6);
|
||||
const sum = bechChecksum(prefix, words, ENCODING_CONST);
|
||||
if (!_words.endsWith(sum)) throw new Error(`Invalid checksum in ${str}: expected "${sum}"`);
|
||||
return { prefix, words };
|
||||
}
|
||||
|
||||
const decodeUnsafe = unsafeWrapper(decode);
|
||||
|
||||
function decodeToBytes(str: string): Bech32DecodedWithArray {
|
||||
const { prefix, words } = decode(str, false);
|
||||
return { prefix, words, bytes: fromWords(words) };
|
||||
}
|
||||
|
||||
return { encode, decode, decodeToBytes, decodeUnsafe, fromWords, fromWordsUnsafe, toWords };
|
||||
}
|
||||
|
||||
const bech32 = genBech32('bech32');
|
||||
const bech32m = genBech32('bech32m');
|
||||
|
||||
declare const TextEncoder: any;
|
||||
declare const TextDecoder: any;
|
||||
|
||||
const utf8: BytesCoder = {
|
||||
encode: (data) => new TextDecoder().decode(data),
|
||||
decode: (str) => new TextEncoder().encode(str),
|
||||
};
|
||||
|
||||
const hex: BytesCoder = chain(
|
||||
radix2(4),
|
||||
alphabet('0123456789abcdef'),
|
||||
join(''),
|
||||
normalize((s: string) => {
|
||||
if (typeof s !== 'string' || s.length % 2)
|
||||
throw new TypeError(`hex.decode: expected string, got ${typeof s} with length ${s.length}`);
|
||||
return s.toLowerCase();
|
||||
})
|
||||
);
|
||||
|
||||
// prettier-ignore
|
||||
const CODERS = {
|
||||
utf8, hex, base16, base32, base64, base64url, base58, base58xmr
|
||||
};
|
||||
type CoderType = keyof typeof CODERS;
|
||||
const coderTypeError = `Invalid encoding type. Available types: ${Object.keys(CODERS).join(', ')}`;
|
||||
|
||||
const bytesToString = (type: CoderType, bytes: Uint8Array): string => {
|
||||
if (typeof type !== 'string' || !CODERS.hasOwnProperty(type)) throw new TypeError(coderTypeError);
|
||||
if (!(bytes instanceof Uint8Array)) throw new TypeError('bytesToString() expects Uint8Array');
|
||||
return CODERS[type].encode(bytes);
|
||||
};
|
||||
const str = bytesToString; // as in python, but for bytes only
|
||||
|
||||
const stringToBytes = (type: CoderType, str: string): Uint8Array => {
|
||||
if (!CODERS.hasOwnProperty(type)) throw new TypeError(coderTypeError);
|
||||
if (typeof str !== 'string') throw new TypeError('stringToBytes() expects string');
|
||||
return CODERS[type].decode(str);
|
||||
};
|
||||
const bytes = stringToBytes;
|
||||
Reference in New Issue
Block a user