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114 lines
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../mCaptcha_browser/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
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<span class="doccomment">//! mCaptcha is a proof of work based Denaial-of-Service attack protection system.</span>
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<span class="doccomment">//! This is is a WASM library that you can embed in your frontend code to protect your</span>
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<span class="doccomment">//! service.</span>
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<span class="doccomment">//!</span>
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<span class="doccomment">//! A commercial managed solution is in the works but I'd much rather prefer</span>
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<span class="doccomment">//! folks host their own instances as it will make the more decentralized and free.</span>
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<span class="doccomment">//!</span>
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<span class="doccomment">//! ## Workflow:</span>
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<span class="doccomment">//! mCaptcha workflow in the frontend is simple.</span>
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<span class="doccomment">//! 1. Call service to get a proof of work(PoW) configuration</span>
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<span class="doccomment">//! 2. Call into mCaptcha to get PoW</span>
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<span class="doccomment">//! 3. Send PoW to your service</span>
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<span class="kw">use</span> <span class="ident">wasm_bindgen</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
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<span class="comment">// When the `wee_alloc` feature is enabled, use `wee_alloc` as the global</span>
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<span class="comment">// allocator.</span>
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"wee_alloc"</span>)]</span>
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<span class="attribute">#[<span class="ident">global_allocator</span>]</span>
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<span class="kw">static</span> <span class="ident">ALLOC</span>: <span class="ident">wee_alloc</span>::<span class="ident">WeeAlloc</span> <span class="op">=</span> <span class="ident">wee_alloc</span>::<span class="ident">WeeAlloc</span>::<span class="ident">INIT</span>;
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<span class="kw">use</span> <span class="ident">pow_sha256</span>::<span class="ident">PoW</span>;
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<span class="attribute">#[<span class="ident">wasm_bindgen</span>]</span>
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<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">gen_pow</span>(<span class="ident">difficulty_factor</span>: <span class="ident">u32</span>, <span class="ident">secret</span>: <span class="ident">String</span>) <span class="op">-</span><span class="op">></span> <span class="ident">String</span> {
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<span class="kw">let</span> <span class="ident">difficulty</span> <span class="op">=</span> <span class="ident">u128</span>::<span class="ident">max_value</span>() <span class="op">-</span> <span class="ident">u128</span>::<span class="ident">max_value</span>() <span class="op">/</span> <span class="ident">difficulty_factor</span> <span class="kw">as</span> <span class="ident">u128</span>;
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<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">PoW</span>::<span class="ident">prove_work</span>(<span class="kw-2">&</span><span class="ident">secret</span>.<span class="ident">as_bytes</span>().<span class="ident">to_vec</span>(), <span class="ident">difficulty</span>).<span class="ident">unwrap</span>();
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<span class="kw">let</span> <span class="ident">payload</span> <span class="op">=</span> <span class="ident">serde_json</span>::<span class="ident">to_string</span>(<span class="kw-2">&</span><span class="ident">a</span>).<span class="ident">unwrap</span>();
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<span class="ident">payload</span>
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}
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<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
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<span class="kw">mod</span> <span class="ident">tests</span> {
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<span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
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<span class="attribute">#[<span class="ident">test</span>]</span>
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<span class="kw">fn</span> <span class="ident">it_works</span>() {
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<span class="kw">let</span> <span class="ident">payload</span> <span class="op">=</span> <span class="ident">gen_pow</span>(<span class="number">500</span>, <span class="string">"MFsqLMZId629Dh2hrtux2Qdn3gBzCaSt"</span>.<span class="ident">into</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"{\"nonce\":312,\"result\":\"340175381422106372296624206295814425082\",\"_spook\":null}"</span>, <span class="kw-2">&</span><span class="ident">payload</span> );
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<span class="kw">let</span> <span class="ident">payload</span> <span class="op">=</span> <span class="ident">gen_pow</span>(<span class="number">1_000</span>, <span class="string">"MFsqLMZId629Dh2hrtux2Qdn3gBzCaSt"</span>.<span class="ident">into</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"{\"nonce\":312,\"result\":\"340175381422106372296624206295814425082\",\"_spook\":null}"</span>, <span class="kw-2">&</span><span class="ident">payload</span>);
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<span class="kw">let</span> <span class="ident">payload</span> <span class="op">=</span> <span class="ident">gen_pow</span>(<span class="number">2_000</span>, <span class="string">"MFsqLMZId629Dh2hrtux2Qdn3gBzCaSt"</span>.<span class="ident">into</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">payload</span>, <span class="string">"{\"nonce\":312,\"result\":\"340175381422106372296624206295814425082\",\"_spook\":null}"</span>);
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<span class="kw">let</span> <span class="ident">payload</span> <span class="op">=</span> <span class="ident">gen_pow</span>(<span class="number">100_000</span>, <span class="string">"MFsqLMZId629Dh2hrtux2Qdn3gBzCaSt"</span>.<span class="ident">into</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">payload</span>, <span class="string">"{\"nonce\":59930,\"result\":\"340281433562218714678373578791487113813\",\"_spook\":null}"</span>);
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<span class="kw">let</span> <span class="ident">payload</span> <span class="op">=</span> <span class="ident">gen_pow</span>(<span class="number">1_000_000</span>, <span class="string">"MFsqLMZId629Dh2hrtux2Qdn3gBzCaSt"</span>.<span class="ident">into</span>());
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">payload</span>,<span class="string">"{\"nonce\":1902451,\"result\":\"340282308726676882310449308394036800665\",\"_spook\":null}"</span>);
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}
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}
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</pre></div>
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