survey/vendor/pow/mcaptcha_browser_bg.js

import * as wasm from './mcaptcha_browser_bg.wasm';

let WASM_VECTOR_LEN = 0;

let cachegetUint8Memory0 = null;
function getUint8Memory0() {
    if (cachegetUint8Memory0 === null || cachegetUint8Memory0.buffer !== wasm.memory.buffer) {
        cachegetUint8Memory0 = new Uint8Array(wasm.memory.buffer);
    }
    return cachegetUint8Memory0;
}

const lTextEncoder = typeof TextEncoder === 'undefined' ? (0, module.require)('util').TextEncoder : TextEncoder;

let cachedTextEncoder = new lTextEncoder('utf-8');

const encodeString = (typeof cachedTextEncoder.encodeInto === 'function'
    ? function (arg, view) {
    return cachedTextEncoder.encodeInto(arg, view);
}
    : function (arg, view) {
    const buf = cachedTextEncoder.encode(arg);
    view.set(buf);
    return {
        read: arg.length,
        written: buf.length
    };
});

function passStringToWasm0(arg, malloc, realloc) {

    if (realloc === undefined) {
        const buf = cachedTextEncoder.encode(arg);
        const ptr = malloc(buf.length);
        getUint8Memory0().subarray(ptr, ptr + buf.length).set(buf);
        WASM_VECTOR_LEN = buf.length;
        return ptr;
    }

    let len = arg.length;
    let ptr = malloc(len);

    const mem = getUint8Memory0();

    let offset = 0;

    for (; offset < len; offset++) {
        const code = arg.charCodeAt(offset);
        if (code > 0x7F) break;
        mem[ptr + offset] = code;
    }

    if (offset !== len) {
        if (offset !== 0) {
            arg = arg.slice(offset);
        }
        ptr = realloc(ptr, len, len = offset + arg.length * 3);
        const view = getUint8Memory0().subarray(ptr + offset, ptr + len);
        const ret = encodeString(arg, view);

        offset += ret.written;
    }

    WASM_VECTOR_LEN = offset;
    return ptr;
}

let cachegetInt32Memory0 = null;
function getInt32Memory0() {
    if (cachegetInt32Memory0 === null || cachegetInt32Memory0.buffer !== wasm.memory.buffer) {
        cachegetInt32Memory0 = new Int32Array(wasm.memory.buffer);
    }
    return cachegetInt32Memory0;
}

const lTextDecoder = typeof TextDecoder === 'undefined' ? (0, module.require)('util').TextDecoder : TextDecoder;

let cachedTextDecoder = new lTextDecoder('utf-8', { ignoreBOM: true, fatal: true });

cachedTextDecoder.decode();

function getStringFromWasm0(ptr, len) {
    return cachedTextDecoder.decode(getUint8Memory0().subarray(ptr, ptr + len));
}
/**
* generate proof-of-work
* ```rust
* fn main() {
*    use mcaptcha_browser::*;
*    use pow_sha256::*;
*
*
*    // salt using which PoW should be computed
*    const SALT: &str = "yrandomsaltisnotlongenoug";
*    // one-time phrase over which PoW should be computed
*    const PHRASE: &str = "ironmansucks";
*    // and the difficulty factor
*    const DIFFICULTY: u32 = 1000;
*
*    // currently gen_pow() returns a JSON formated string to better communicate
*    // with JavaScript. See [PoW<T>][pow_sha256::PoW] for schema
*    let serialised_work = gen_pow(SALT.into(), PHRASE.into(), DIFFICULTY);
*
*
*    let work: Work = serde_json::from_str(&serialised_work).unwrap();
*
*    let work = PoWBuilder::default()
*        .result(work.result)
*        .nonce(work.nonce)
*        .build()
*        .unwrap();
*
*    let config = ConfigBuilder::default().salt(SALT.into()).build().unwrap();
*    assert!(config.is_valid_proof(&work, &PHRASE.to_string()));
*    assert!(config.is_sufficient_difficulty(&work, DIFFICULTY));
* }
* ```
* @param {string} salt
* @param {string} phrase
* @param {number} difficulty_factor
* @returns {string}
*/
export function gen_pow(salt, phrase, difficulty_factor) {
    try {
        const retptr = wasm.__wbindgen_add_to_stack_pointer(-16);
        var ptr0 = passStringToWasm0(salt, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
        var len0 = WASM_VECTOR_LEN;
        var ptr1 = passStringToWasm0(phrase, wasm.__wbindgen_malloc, wasm.__wbindgen_realloc);
        var len1 = WASM_VECTOR_LEN;
        wasm.gen_pow(retptr, ptr0, len0, ptr1, len1, difficulty_factor);
        var r0 = getInt32Memory0()[retptr / 4 + 0];
        var r1 = getInt32Memory0()[retptr / 4 + 1];
        return getStringFromWasm0(r0, r1);
    } finally {
        wasm.__wbindgen_add_to_stack_pointer(16);
        wasm.__wbindgen_free(r0, r1);
    }
}