diff --git a/widget/src/cap.min.js b/widget/src/cap.min.js index d7767f5..1c25308 100644 --- a/widget/src/cap.min.js +++ b/widget/src/cap.min.js @@ -1 +1 @@ -!function(){const e="0.0.6",t=function(){return window?.CAP_CUSTOM_FETCH?window.CAP_CUSTOM_FETCH(...arguments):fetch(...arguments)};window.CAP_CUSTOM_WASM_URL||[`https://cdn.jsdelivr.net/npm/@cap.js/wasm@${e}/browser/cap_wasm.min.js`,`https://cdn.jsdelivr.net/npm/@cap.js/wasm@${e}/browser/cap_wasm_bg.wasm`].forEach(e=>{const t=document.createElement("link");t.rel="prefetch",t.href=e,t.as=e.endsWith(".wasm")?"fetch":"script",document.head.appendChild(t)});class r extends HTMLElement{#e="";#t=null;#r=navigator.hardwareConcurrency||8;token=null;#s;#i;#a;#n=!1;#o;getI18nText(e,t){return this.getAttribute(`data-cap-i18n-${e}`)||t}static get observedAttributes(){return["onsolve","onprogress","onreset","onerror","data-cap-worker-count","data-cap-i18n-initial-state","[cap]"]}constructor(){super(),this.#o&&this.#o.forEach((e,t)=>{this.removeEventListener(t.slice(2),e)}),this.#o=new Map,this.boundHandleProgress=this.handleProgress.bind(this),this.boundHandleSolve=this.handleSolve.bind(this),this.boundHandleError=this.handleError.bind(this),this.boundHandleReset=this.handleReset.bind(this)}initialize(){this.#e=URL.createObjectURL(new Blob(['(()=>{if("object"!=typeof WebAssembly||"function"!=typeof WebAssembly?.instantiate)return self.onmessage=async({data:{salt:e,target:r}})=>{let o=0;let t=0;const s=new TextEncoder,n=new Uint8Array(r.length/2);for(let e=0;e{e!==s&&(e=s,await import(s).then(e=>e.default().then(o=>{r=(o&&o.exports?o.exports:e).solve_pow})).catch(e=>{console.error("[cap worker] using fallback solver due to error:",e)}));try{const e=performance.now(),s=r(o,t),n=performance.now();self.postMessage({nonce:Number(s),found:!0,durationMs:(n-e).toFixed(2)})}catch(e){console.error("[cap worker]",e),self.postMessage({found:!1,error:e.message||String(e)})}},self.onerror=e=>{self.postMessage({found:!1,error:e})}})();'],{type:"application/javascript"}))}attributeChangedCallback(e,t,r){if(e.startsWith("on")){const t=e.slice(2),s=this.#o.get(e);if(s&&this.removeEventListener(t,s),r){const r=t=>{const r=this.getAttribute(e);"function"==typeof window[r]&&window[r].call(this,t)};this.#o.set(e,r),this.addEventListener(t,r)}}"data-cap-worker-count"===e&&this.setWorkersCount(parseInt(r)),"data-cap-i18n-initial-state"===e&&this.#i&&this.#i?.querySelector("p")?.innerText&&(this.#i.querySelector("p").innerText=this.getI18nText("initial-state","I'm a human"))}async connectedCallback(){this.#a=this,this.#s=this.attachShadow({mode:"open"}),this.#i=document.createElement("div"),this.createUI(),this.addEventListeners(),await this.initialize(),this.#i.removeAttribute("disabled");const e=this.getAttribute("data-cap-worker-count"),t=e?parseInt(e,10):null;this.setWorkersCount(t||navigator.hardwareConcurrency||8);const r=this.getAttribute("data-cap-hidden-field-name")||"cap-token";this.#a.innerHTML=``}async solve(){if(!this.#n)try{this.#n=!0,this.updateUI("verifying",this.getI18nText("verifying-label","Verifying..."),!0),this.#i.setAttribute("aria-label",this.getI18nText("verifying-aria-label","Verifying you're a human, please wait")),this.dispatchEvent("progress",{progress:0});try{const e=this.getAttribute("data-cap-api-endpoint");if(!e)throw new Error("Missing API endpoint");const{challenge:r,token:s}=await(await t(`${e}challenge`,{method:"POST"})).json();let i=r;if(!Array.isArray(i)){function d(e,t){let r=function(e){let t=2166136261;for(let r=0;r>>0}(e),s="";function i(){return r^=r<<13,r^=r>>>17,r^=r<<5,r>>>0}for(;s.length(l+=1,[d(`${s}${l}`,r.s),d(`${s}${l}d`,r.d)]))}const a=await this.solveChallenges(i),n=await(await t(`${e}redeem`,{method:"POST",body:JSON.stringify({token:s,solutions:a}),headers:{"Content-Type":"application/json"}})).json();if(this.dispatchEvent("progress",{progress:100}),!n.success)throw new Error("Invalid solution");const o=this.getAttribute("data-cap-hidden-field-name")||"cap-token";this.querySelector(`input[name='${o}']`)&&(this.querySelector(`input[name='${o}']`).value=n.token),this.dispatchEvent("solve",{token:n.token}),this.token=n.token,this.#t&&clearTimeout(this.#t);const c=new Date(n.expires).getTime()-Date.now();return c>0&&c<864e5?this.#t=setTimeout(()=>this.reset(),c):this.error("Invalid expiration time"),this.#i.setAttribute("aria-label",this.getI18nText("verified-aria-label","We have verified you're a human, you may now continue")),{success:!0,token:this.token}}catch(h){throw this.#i.setAttribute("aria-label",this.getI18nText("error-aria-label","An error occurred, please try again")),this.error(h.message),h}}finally{this.#n=!1}}async solveChallenges(t){const r=t.length;let s=0;const i=Array(this.#r).fill(null).map(()=>{try{return new Worker(this.#e)}catch(e){throw console.error("[cap] Failed to create worker:",e),new Error("Worker creation failed")}}),a=([t,a],n)=>new Promise((o,c)=>{const d=i[n];if(!d)return void c(new Error("Worker not available"));const l=setTimeout(()=>{try{d.terminate(),i[n]=new Worker(this.#e)}catch(e){console.error("[cap] error terminating/recreating worker:",e)}c(new Error("Worker timeout"))},3e4);d.onmessage=({data:e})=>{e.found&&(clearTimeout(l),s++,this.dispatchEvent("progress",{progress:Math.round(s/r*100)}),o(e.nonce))},d.onerror=e=>{clearTimeout(l),this.error(`Error in worker: ${e.message||e}`),c(e)},d.postMessage({salt:t,target:a,wasmUrl:window.CAP_CUSTOM_WASM_URL||`https://cdn.jsdelivr.net/npm/@cap.js/wasm@${e}/browser/cap_wasm.min.js`})}),n=[];try{for(let e=0;ea(e,t)));n.push(...s)}}finally{i.forEach(e=>{if(e)try{e.terminate()}catch(e){console.error("[cap] error terminating worker:",e)}})}return n}setWorkersCount(e){const t=parseInt(e,10),r=Math.min(navigator.hardwareConcurrency||8,16);this.#r=!isNaN(t)&&t>0&&t<=r?t:navigator.hardwareConcurrency||8}createUI(){this.#i.classList.add("captcha"),this.#i.setAttribute("role","button"),this.#i.setAttribute("tabindex","0"),this.#i.setAttribute("aria-label",this.getI18nText("verify-aria-label","Click to verify you're a human")),this.#i.setAttribute("aria-live","polite"),this.#i.setAttribute("disabled","true"),this.#i.innerHTML=`

${this.getI18nText("initial-state","I'm a human")}

Cap`,this.#s.innerHTML='',this.#s.appendChild(this.#i)}addEventListeners(){this.#i&&(this.#i.querySelector("a").addEventListener("click",e=>{e.stopPropagation(),e.preventDefault(),window.open("https://capjs.js.org","_blank")}),this.#i.addEventListener("click",()=>{this.#i.hasAttribute("disabled")||this.solve()}),this.#i.addEventListener("keydown",e=>{"Enter"!==e.key&&" "!==e.key||this.#i.hasAttribute("disabled")||(e.preventDefault(),e.stopPropagation(),this.solve())}),this.addEventListener("progress",this.boundHandleProgress),this.addEventListener("solve",this.boundHandleSolve),this.addEventListener("error",this.boundHandleError),this.addEventListener("reset",this.boundHandleReset))}updateUI(e,t,r=!1){this.#i&&(this.#i.setAttribute("data-state",e),this.#i.querySelector("p").innerText=t,r?this.#i.setAttribute("disabled","true"):this.#i.removeAttribute("disabled"))}handleProgress(e){if(!this.#i)return;const t=this.#i.querySelector("p"),r=this.#i.querySelector(".checkbox");t&&r&&(r.style.setProperty("--progress",`${e.detail.progress}%`),t.innerText=`${this.getI18nText("verifying-label","Verifying...")} ${e.detail.progress}%`),this.executeAttributeCode("onprogress",e)}handleSolve(e){this.updateUI("done",this.getI18nText("solved-label","You're a human"),!0),this.executeAttributeCode("onsolve",e)}handleError(e){this.updateUI("error",this.getI18nText("error-label","Error. Try again.")),this.executeAttributeCode("onerror",e)}handleReset(e){this.updateUI("",this.getI18nText("initial-state","I'm a human")),this.executeAttributeCode("onreset",e)}executeAttributeCode(e,t){const r=this.getAttribute(e);r&&new Function("event",r).call(this,t)}error(e="Unknown error"){console.error("[cap]",e),this.dispatchEvent("error",{isCap:!0,message:e})}dispatchEvent(e,t={}){const r=new CustomEvent(e,{bubbles:!0,composed:!0,detail:t});super.dispatchEvent(r)}reset(){this.#t&&(clearTimeout(this.#t),this.#t=null),this.dispatchEvent("reset"),this.token=null;const e=this.getAttribute("data-cap-hidden-field-name")||"cap-token";this.querySelector(`input[name='${e}']`)&&(this.querySelector(`input[name='${e}']`).value="")}get tokenValue(){return this.token}disconnectedCallback(){this.removeEventListener("progress",this.boundHandleProgress),this.removeEventListener("solve",this.boundHandleSolve),this.removeEventListener("error",this.boundHandleError),this.removeEventListener("reset",this.boundHandleReset),this.#o.forEach((e,t)=>{this.removeEventListener(t.slice(2),e)}),this.#o.clear(),this.#s&&(this.#s.innerHTML=""),this.reset(),this.cleanup()}cleanup(){this.#t&&(clearTimeout(this.#t),this.#t=null),this.#e&&(URL.revokeObjectURL(this.#e),this.#e="")}}class s{constructor(e={},t){let r=t||document.createElement("cap-widget");if(Object.entries(e).forEach(([e,t])=>{r.setAttribute(e,t)}),!e.apiEndpoint)throw r.remove(),new Error("Missing API endpoint");r.setAttribute("data-cap-api-endpoint",e.apiEndpoint),this.widget=r,this.solve=this.widget.solve.bind(this.widget),this.reset=this.widget.reset.bind(this.widget),this.addEventListener=this.widget.addEventListener.bind(this.widget),Object.defineProperty(this,"token",{get:()=>r.token,configurable:!0,enumerable:!0}),t||(r.style.display="none",document.documentElement.appendChild(r))}}window.Cap=s,customElements.get("cap-widget")||window?.CAP_DONT_SKIP_REDEFINE?console.warn("[cap] the cap-widget element has already been defined, skipping re-defining it.\nto prevent this, set window.CAP_DONT_SKIP_REDEFINE to true"):customElements.define("cap-widget",r),"object"==typeof exports&&"undefined"!=typeof module?module.exports=s:"function"==typeof define&&define.amd&&define([],function(){return s}),"undefined"!=typeof exports&&(exports.default=s)}(); \ No newline at end of file +(()=>{const e="0.0.6",t=(...e)=>window?.CAP_CUSTOM_FETCH?window.CAP_CUSTOM_FETCH(...e):fetch(...e);function r(e,t){let r=function(e){let t=2166136261;for(let r=0;r>>0}(e),s="";function i(){return r^=r<<13,r^=r>>>17,r^=r<<5,r>>>0}for(;s.length{const t=document.createElement("link");t.rel="prefetch",t.href=e,t.as=e.endsWith(".wasm")?"fetch":"script",document.head.appendChild(t)});class s extends HTMLElement{#e="";#t=null;#r=navigator.hardwareConcurrency||8;token=null;#s;#i;#a;#n=!1;#o;getI18nText(e,t){return this.getAttribute(`data-cap-i18n-${e}`)||t}static get observedAttributes(){return["onsolve","onprogress","onreset","onerror","data-cap-worker-count","data-cap-i18n-initial-state","[cap]"]}constructor(){super(),this.#o&&this.#o.forEach((e,t)=>{this.removeEventListener(t.slice(2),e)}),this.#o=new Map,this.boundHandleProgress=this.handleProgress.bind(this),this.boundHandleSolve=this.handleSolve.bind(this),this.boundHandleError=this.handleError.bind(this),this.boundHandleReset=this.handleReset.bind(this)}initialize(){this.#e=URL.createObjectURL(new Blob(['(()=>{const e=async({salt:e,target:t})=>{let r=0;const o=new TextEncoder,s=new Uint8Array(t.length/2);for(let e=0;ee({salt:t,target:r}));let t,r;self.onmessage=async({data:{salt:o,target:s,wasmUrl:n}})=>{let a;if(t===n||(t=n,await import(n).then(e=>e.default().then(t=>{r=(t?.exports?t.exports:e).solve_pow})).catch(t=>(console.error("[cap worker] using fallback solver due to error:",t),a=!0,e({salt:o,target:s}))),!a))try{const e=performance.now(),t=r(o,s),n=performance.now();self.postMessage({nonce:Number(t),found:!0,durationMs:(n-e).toFixed(2)})}catch(e){console.error("[cap worker]",e),self.postMessage({found:!1,error:e.message||String(e)})}},self.onerror=e=>{self.postMessage({found:!1,error:e})}})();'],{type:"application/javascript"}))}attributeChangedCallback(e,t,r){if(e.startsWith("on")){const t=e.slice(2),s=this.#o.get(e);if(s&&this.removeEventListener(t,s),r){const r=t=>{const r=this.getAttribute(e);"function"==typeof window[r]&&window[r].call(this,t)};this.#o.set(e,r),this.addEventListener(t,r)}}"data-cap-worker-count"===e&&this.setWorkersCount(parseInt(r)),"data-cap-i18n-initial-state"===e&&this.#i&&this.#i?.querySelector("p")?.innerText&&(this.#i.querySelector("p").innerText=this.getI18nText("initial-state","I'm a human"))}async connectedCallback(){this.#a=this,this.#s=this.attachShadow({mode:"open"}),this.#i=document.createElement("div"),this.createUI(),this.addEventListeners(),await this.initialize(),this.#i.removeAttribute("disabled");const e=this.getAttribute("data-cap-worker-count"),t=e?parseInt(e,10):null;this.setWorkersCount(t||navigator.hardwareConcurrency||8);const r=this.getAttribute("data-cap-hidden-field-name")||"cap-token";this.#a.innerHTML=``}async solve(){if(!this.#n)try{this.#n=!0,this.updateUI("verifying",this.getI18nText("verifying-label","Verifying..."),!0),this.#i.setAttribute("aria-label",this.getI18nText("verifying-aria-label","Verifying you're a human, please wait")),this.dispatchEvent("progress",{progress:0});try{let e=this.getAttribute("data-cap-api-endpoint");if(!e&&window?.CAP_CUSTOM_FETCH)e="/";else if(!e)throw new Error("Missing API endpoint. Either custom fetch or an API endpoint must be provided.");const{challenge:s,token:i}=await(await t(`${e}challenge`,{method:"POST"})).json();let a=s;if(!Array.isArray(a)){let e=0;a=Array.from({length:s.c},()=>(e+=1,[r(`${i}${e}`,s.s),r(`${i}${e}d`,s.d)]))}const n=await this.solveChallenges(a),o=await(await t(`${e}redeem`,{method:"POST",body:JSON.stringify({token:i,solutions:n}),headers:{"Content-Type":"application/json"}})).json();if(this.dispatchEvent("progress",{progress:100}),!o.success)throw new Error("Invalid solution");const d=this.getAttribute("data-cap-hidden-field-name")||"cap-token";this.querySelector(`input[name='${d}']`)&&(this.querySelector(`input[name='${d}']`).value=o.token),this.dispatchEvent("solve",{token:o.token}),this.token=o.token,this.#t&&clearTimeout(this.#t);const c=new Date(o.expires).getTime()-Date.now();return c>0&&c<864e5?this.#t=setTimeout(()=>this.reset(),c):this.error("Invalid expiration time"),this.#i.setAttribute("aria-label",this.getI18nText("verified-aria-label","We have verified you're a human, you may now continue")),{success:!0,token:this.token}}catch(e){throw this.#i.setAttribute("aria-label",this.getI18nText("error-aria-label","An error occurred, please try again")),this.error(e.message),e}}finally{this.#n=!1}}async solveChallenges(t){const r=t.length;let s=0;const i=Array(this.#r).fill(null).map(()=>{try{return new Worker(this.#e)}catch(e){throw console.error("[cap] Failed to create worker:",e),new Error("Worker creation failed")}}),a=([t,a],n)=>new Promise((o,d)=>{const c=i[n];if(!c)return void d(new Error("Worker not available"));const l=setTimeout(()=>{try{c.terminate(),i[n]=new Worker(this.#e)}catch(e){console.error("[cap] error terminating/recreating worker:",e)}d(new Error("Worker timeout"))},3e4);c.onmessage=({data:e})=>{e.found&&(clearTimeout(l),s++,this.dispatchEvent("progress",{progress:Math.round(s/r*100)}),o(e.nonce))},c.onerror=e=>{clearTimeout(l),this.error(`Error in worker: ${e.message||e}`),d(e)},c.postMessage({salt:t,target:a,wasmUrl:window.CAP_CUSTOM_WASM_URL||`https://cdn.jsdelivr.net/npm/@cap.js/wasm@${e}/browser/cap_wasm.min.js`})}),n=[];try{for(let e=0;ea(e,t)));n.push(...s)}}finally{i.forEach(e=>{if(e)try{e.terminate()}catch(e){console.error("[cap] error terminating worker:",e)}})}return n}setWorkersCount(e){const t=parseInt(e,10),r=Math.min(navigator.hardwareConcurrency||8,16);this.#r=!Number.isNaN(t)&&t>0&&t<=r?t:navigator.hardwareConcurrency||8}createUI(){this.#i.classList.add("captcha"),this.#i.setAttribute("role","button"),this.#i.setAttribute("tabindex","0"),this.#i.setAttribute("aria-label",this.getI18nText("verify-aria-label","Click to verify you're a human")),this.#i.setAttribute("aria-live","polite"),this.#i.setAttribute("disabled","true"),this.#i.innerHTML=`

${this.getI18nText("initial-state","I'm a human")}

Cap`,this.#s.innerHTML='',this.#s.appendChild(this.#i)}addEventListeners(){this.#i&&(this.#i.querySelector("a").addEventListener("click",e=>{e.stopPropagation(),e.preventDefault(),window.open("https://capjs.js.org","_blank")}),this.#i.addEventListener("click",()=>{this.#i.hasAttribute("disabled")||this.solve()}),this.#i.addEventListener("keydown",e=>{"Enter"!==e.key&&" "!==e.key||this.#i.hasAttribute("disabled")||(e.preventDefault(),e.stopPropagation(),this.solve())}),this.addEventListener("progress",this.boundHandleProgress),this.addEventListener("solve",this.boundHandleSolve),this.addEventListener("error",this.boundHandleError),this.addEventListener("reset",this.boundHandleReset))}updateUI(e,t,r=!1){this.#i&&(this.#i.setAttribute("data-state",e),this.#i.querySelector("p").innerText=t,r?this.#i.setAttribute("disabled","true"):this.#i.removeAttribute("disabled"))}handleProgress(e){if(!this.#i)return;const t=this.#i.querySelector("p"),r=this.#i.querySelector(".checkbox");t&&r&&(r.style.setProperty("--progress",`${e.detail.progress}%`),t.innerText=`${this.getI18nText("verifying-label","Verifying...")} ${e.detail.progress}%`),this.executeAttributeCode("onprogress",e)}handleSolve(e){this.updateUI("done",this.getI18nText("solved-label","You're a human"),!0),this.executeAttributeCode("onsolve",e)}handleError(e){this.updateUI("error",this.getI18nText("error-label","Error. Try again.")),this.executeAttributeCode("onerror",e)}handleReset(e){this.updateUI("",this.getI18nText("initial-state","I'm a human")),this.executeAttributeCode("onreset",e)}executeAttributeCode(e,t){const r=this.getAttribute(e);r&&new Function("event",r).call(this,t)}error(e="Unknown error"){console.error("[cap]",e),this.dispatchEvent("error",{isCap:!0,message:e})}dispatchEvent(e,t={}){const r=new CustomEvent(e,{bubbles:!0,composed:!0,detail:t});super.dispatchEvent(r)}reset(){this.#t&&(clearTimeout(this.#t),this.#t=null),this.dispatchEvent("reset"),this.token=null;const e=this.getAttribute("data-cap-hidden-field-name")||"cap-token";this.querySelector(`input[name='${e}']`)&&(this.querySelector(`input[name='${e}']`).value="")}get tokenValue(){return this.token}disconnectedCallback(){this.removeEventListener("progress",this.boundHandleProgress),this.removeEventListener("solve",this.boundHandleSolve),this.removeEventListener("error",this.boundHandleError),this.removeEventListener("reset",this.boundHandleReset),this.#o.forEach((e,t)=>{this.removeEventListener(t.slice(2),e)}),this.#o.clear(),this.#s&&(this.#s.innerHTML=""),this.reset(),this.cleanup()}cleanup(){this.#t&&(clearTimeout(this.#t),this.#t=null),this.#e&&(URL.revokeObjectURL(this.#e),this.#e="")}}class i{constructor(e={},t){const r=t||document.createElement("cap-widget");if(Object.entries(e).forEach(([e,t])=>{r.setAttribute(e,t)}),!e.apiEndpoint&&!window?.CAP_CUSTOM_FETCH)throw r.remove(),new Error("Missing API endpoint. Either custom fetch or an API endpoint must be provided.");e.apiEndpoint&&r.setAttribute("data-cap-api-endpoint",e.apiEndpoint),this.widget=r,this.solve=this.widget.solve.bind(this.widget),this.reset=this.widget.reset.bind(this.widget),this.addEventListener=this.widget.addEventListener.bind(this.widget),Object.defineProperty(this,"token",{get:()=>r.token,configurable:!0,enumerable:!0}),t||(r.style.display="none",document.documentElement.appendChild(r))}}window.Cap=i,customElements.get("cap-widget")||window?.CAP_DONT_SKIP_REDEFINE?console.warn("[cap] the cap-widget element has already been defined, skipping re-defining it.\nto prevent this, set window.CAP_DONT_SKIP_REDEFINE to true"):customElements.define("cap-widget",s),"object"==typeof exports&&"undefined"!=typeof module?module.exports=i:"function"==typeof define&&define.amd&&define([],()=>i),"undefined"!=typeof exports&&(exports.default=i)})(); \ No newline at end of file diff --git a/widget/src/package.json b/widget/src/package.json index 0aa7a08..7265364 100644 --- a/widget/src/package.json +++ b/widget/src/package.json @@ -1,6 +1,6 @@ { "name": "@cap.js/widget", - "version": "0.1.25", + "version": "0.1.26", "description": "Client-side widget for Cap, a lightweight, modern open-source CAPTCHA alternative designed using SHA-256 PoW.", "keywords": [ "security", diff --git a/widget/src/src/worker.js b/widget/src/src/worker.js index ad5188d..34662d6 100644 --- a/widget/src/src/worker.js +++ b/widget/src/src/worker.js @@ -1,69 +1,71 @@ (() => { + const solveFallback = async ({ salt, target }) => { + let nonce = 0; + const batchSize = 50000; + const encoder = new TextEncoder(); + + const targetBytes = new Uint8Array(target.length / 2); + for (let k = 0; k < targetBytes.length; k++) { + targetBytes[k] = parseInt(target.substring(k * 2, k * 2 + 2), 16); + } + const targetBytesLength = targetBytes.length; + + while (true) { + try { + for (let i = 0; i < batchSize; i++) { + const inputString = salt + nonce; + const inputBytes = encoder.encode(inputString); + + const hashBuffer = await crypto.subtle.digest("SHA-256", inputBytes); + + const hashBytes = new Uint8Array(hashBuffer, 0, targetBytesLength); + + let matches = true; + for (let k = 0; k < targetBytesLength; k++) { + if (hashBytes[k] !== targetBytes[k]) { + matches = false; + break; + } + } + + if (matches) { + self.postMessage({ nonce, found: true }); + return; + } + + nonce++; + } + } catch (error) { + console.error("[cap worker]", error); + self.postMessage({ + found: false, + error: error.message, + }); + return; + } + } + }; + if ( typeof WebAssembly !== "object" || typeof WebAssembly?.instantiate !== "function" ) { - // fallback worker for environments without wasm - // this is much slower than the wasm version - - self.onmessage = async ({ data: { salt, target } }) => { - let nonce = 0; - const batchSize = 50000; - const encoder = new TextEncoder(); - - const targetBytes = new Uint8Array(target.length / 2); - for (let k = 0; k < targetBytes.length; k++) { - targetBytes[k] = parseInt(target.substring(k * 2, k * 2 + 2), 16); - } - const targetBytesLength = targetBytes.length; - - while (true) { - try { - for (let i = 0; i < batchSize; i++) { - const inputString = salt + nonce; - const inputBytes = encoder.encode(inputString); - - const hashBuffer = await crypto.subtle.digest( - "SHA-256", - inputBytes, - ); - - const hashBytes = new Uint8Array(hashBuffer, 0, targetBytesLength); - - let matches = true; - for (let k = 0; k < targetBytesLength; k++) { - if (hashBytes[k] !== targetBytes[k]) { - matches = false; - break; - } - } - - if (matches) { - self.postMessage({ nonce, found: true }); - return; - } - - nonce++; - } - } catch (error) { - console.error("[cap worker]", error); - self.postMessage({ - found: false, - error: error.message, - }); - return; - } - } - }; - - return console.warn( + console.warn( "[cap worker] wasm not supported, falling back to alternative solver. this will be significantly slower.", ); + + self.onmessage = async ({ data: { salt, target } }) => { + return solveFallback({ salt, target }); + }; + + return; } let wasmCacheUrl, solve_pow_function; self.onmessage = async ({ data: { salt, target, wasmUrl } }) => { + let fb; + if (wasmCacheUrl !== wasmUrl) { wasmCacheUrl = wasmUrl; await import(wasmUrl) @@ -76,7 +78,12 @@ }) .catch((e) => { console.error("[cap worker] using fallback solver due to error:", e); + fb = true; + + return solveFallback({ salt, target }); }); + + if (fb) return; } try { @@ -91,6 +98,7 @@ }); } catch (error) { console.error("[cap worker]", error); + self.postMessage({ found: false, error: error.message || String(error),