cmd/anubis: drastically optimize proof of work (#19)

* cmd/anubis: drastically optimize proof of work

Closes #12
Closes #17

This drastically optimizes the proof of work check by removing the
stringify call at every iteration. Additionally, this optimizes the
checks by running them in parallel for as many threads as the browser
has available (according to navigator.hardwareConcurrency).

This also changes the redirect lag to 250 milliseconds instead of 2000
milliseconds in order to be perceptually faster. This is below the
reaction time threshold of many people, so this will make the post-check
success phase perceptually instant.

Testing on an iPhone 7 Plus has shown that this can clear a difficulty 4
check in 3.4 seconds.

This actually optimizes the check so much it may be a logistical concern
for operators.

* cmd/anubis/js: fix happy cachebuster logic

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>

5 files changed, 4 insertions, 4 deletions

diff --git a/cmd/anubis/static/js/main.mjs b/cmd/anubis/static/js/main.mjs
index 043f617..3d9e2d0 100644
--- a/cmd/anubis/static/js/main.mjs
+++ b/cmd/anubis/static/js/main.mjs
@@ -1,2 +1,2 @@
-(()=>{function l(n,s=5){return new Promise((i,e)=>{let o=URL.createObjectURL(new Blob(["(",w(),")()"],{type:"application/javascript"})),t=new Worker(o);t.onmessage=r=>{t.terminate(),i(r.data)},t.onerror=r=>{t.terminate(),e()},t.postMessage({data:n,difficulty:s}),URL.revokeObjectURL(o)})}function w(){return function(){let n=s=>{let i=new TextEncoder().encode(s);return crypto.subtle.digest("SHA-256",i.buffer).then(e=>Array.from(new Uint8Array(e)).map(o=>o.toString(16).padStart(2,"0")).join(""))};addEventListener("message",async s=>{let i=s.data.data,e=s.data.difficulty,o,t=0;do o=await n(i+t++);while(o.substring(0,e)!==Array(e+1).join("0"));t-=1,postMessage({hash:o,data:i,difficulty:e,nonce:t})})}.toString()}var h=(n="",s={})=>{let i=new URL(n,window.location.href);return Object.entries(s).forEach(e=>{let[o,t]=e;i.searchParams.set(o,t)}),i.toString()},m=n=>`/.within.website/x/cmd/anubis/static/img/${n}.webp`;(async()=>{let n=document.getElementById("status"),s=document.getElementById("image"),i=document.getElementById("title"),e=document.getElementById("spinner");n.innerHTML="Calculating...";let{challenge:o,difficulty:t}=await fetch("/.within.website/x/cmd/anubis/api/make-challenge",{method:"POST"}).then(a=>{if(!a.ok)throw new Error("Failed to fetch config");return a.json()}).catch(a=>{throw i.innerHTML="Oh no!",n.innerHTML=`Failed to fetch config: ${a.message}`,s.src=m("sad"),e.innerHTML="",e.style.display="none",a});n.innerHTML=`Calculating...<br/>Difficulty: ${t}`;let r=Date.now(),{hash:u,nonce:c}=await l(o,t),d=Date.now();i.innerHTML="Success!",n.innerHTML=`Done! Took ${d-r}ms, ${c} iterations`,s.src=m("happy"),e.innerHTML="",e.style.display="none",setTimeout(()=>{let a=window.location.href;window.location.href=h("/.within.website/x/cmd/anubis/api/pass-challenge",{response:u,nonce:c,redir:a,elapsedTime:d-r})},2e3)})();})();
+(()=>{function m(n,i=5,e=navigator.hardwareConcurrency){return new Promise((t,d)=>{let s=URL.createObjectURL(new Blob(["(",p(),")()"],{type:"application/javascript"})),a=[];for(let u=0;u<e;u++){let o=new Worker(s);o.onmessage=r=>{a.forEach(c=>c.terminate()),o.terminate(),t(r.data)},o.onerror=r=>{o.terminate(),d()},o.postMessage({data:n,difficulty:i,nonce:1e6*u}),a.push(o)}URL.revokeObjectURL(s)})}function p(){return function(){let n=e=>{let t=new TextEncoder().encode(e);return crypto.subtle.digest("SHA-256",t.buffer)};function i(e){return Array.from(e).map(t=>t.toString(16).padStart(2,"0")).join("")}addEventListener("message",async e=>{let t=e.data.data,d=e.data.difficulty,s,a=e.data.nonce||0;for(;;){let u=await n(t+a++),o=new Uint8Array(u),r=!0;for(let c=0;c<d;c++){let l=Math.floor(c/2),f=c%2;if((o[l]>>(f===0?4:0)&15)!==0){r=!1;break}}if(r){s=i(o),console.log(s);break}}a-=1,postMessage({hash:s,data:t,difficulty:d,nonce:a})})}.toString()}var w=(n="",i={})=>{let e=new URL(n,window.location.href);return Object.entries(i).forEach(t=>{let[d,s]=t;e.searchParams.set(d,s)}),e.toString()},h=(n,i)=>w(`/.within.website/x/cmd/anubis/static/img/${n}.webp`,{cacheBuster:i});(async()=>{let n=document.getElementById("status"),i=document.getElementById("image"),e=document.getElementById("title"),t=document.getElementById("spinner"),d=JSON.parse(document.getElementById("anubis_version").textContent);n.innerHTML="Calculating...";let{challenge:s,difficulty:a}=await fetch("/.within.website/x/cmd/anubis/api/make-challenge",{method:"POST"}).then(l=>{if(!l.ok)throw new Error("Failed to fetch config");return l.json()}).catch(l=>{throw e.innerHTML="Oh no!",n.innerHTML=`Failed to fetch config: ${l.message}`,i.src=h("sad"),t.innerHTML="",t.style.display="none",l});n.innerHTML=`Calculating...<br/>Difficulty: ${a}`;let u=Date.now(),{hash:o,nonce:r}=await m(s,a),c=Date.now();console.log({hash:o,nonce:r}),e.innerHTML="Success!",n.innerHTML=`Done! Took ${c-u}ms, ${r} iterations`,i.src=h("happy",d),t.innerHTML="",t.style.display="none",setTimeout(()=>{let l=window.location.href;window.location.href=w("/.within.website/x/cmd/anubis/api/pass-challenge",{response:o,nonce:r,redir:l,elapsedTime:c-u})},250)})();})();
 //# sourceMappingURL=main.mjs.map
diff --git a/cmd/anubis/static/js/main.mjs.br b/cmd/anubis/static/js/main.mjs.br
index 27625da..56b6646 100644
--- a/cmd/anubis/static/js/main.mjs.br
+++ b/cmd/anubis/static/js/main.mjs.br
diff --git a/cmd/anubis/static/js/main.mjs.gz b/cmd/anubis/static/js/main.mjs.gz
index c80b596..f4665ee 100644
--- a/cmd/anubis/static/js/main.mjs.gz
+++ b/cmd/anubis/static/js/main.mjs.gz
diff --git a/cmd/anubis/static/js/main.mjs.map b/cmd/anubis/static/js/main.mjs.map
index d5b288f..577503b 100644
--- a/cmd/anubis/static/js/main.mjs.map
+++ b/cmd/anubis/static/js/main.mjs.map
@@ -1,7 +1,7 @@
 {
   "version": 3,
   "sources": ["../../js/proof-of-work.mjs", "../../js/main.mjs"],
-  "sourcesContent": ["// https://dev.to/ratmd/simple-proof-of-work-in-javascript-3kgm\n\nexport function process(data, difficulty = 5) {\n  return new Promise((resolve, reject) => {\n    let webWorkerURL = URL.createObjectURL(new Blob([\n      '(', processTask(), ')()'\n    ], { type: 'application/javascript' }));\n\n    let worker = new Worker(webWorkerURL);\n\n    worker.onmessage = (event) => {\n      worker.terminate();\n      resolve(event.data);\n    };\n\n    worker.onerror = (event) => {\n      worker.terminate();\n      reject();\n    };\n\n    worker.postMessage({\n      data,\n      difficulty\n    });\n\n    URL.revokeObjectURL(webWorkerURL);\n  });\n}\n\nfunction processTask() {\n  return function () {\n    const sha256 = (text) => {\n      const encoded = new TextEncoder().encode(text);\n      return crypto.subtle.digest(\"SHA-256\", encoded.buffer).then((result) =>\n        Array.from(new Uint8Array(result))\n          .map((c) => c.toString(16).padStart(2, \"0\"))\n          .join(\"\"),\n      );\n    };\n\n    addEventListener('message', async (event) => {\n      let data = event.data.data;\n      let difficulty = event.data.difficulty;\n\n      let hash;\n      let nonce = 0;\n      do {\n        hash = await sha256(data + nonce++);\n      } while (hash.substring(0, difficulty) !== Array(difficulty + 1).join('0'));\n\n      nonce -= 1; // last nonce was post-incremented\n\n      postMessage({\n        hash,\n        data,\n        difficulty,\n        nonce,\n      });\n    });\n  }.toString();\n}\n\n", "import { process } from './proof-of-work.mjs';\nimport { testVideo } from './video.mjs';\n\n// from Xeact\nconst u = (url = \"\", params = {}) => {\n  let result = new URL(url, window.location.href);\n  Object.entries(params).forEach((kv) => {\n    let [k, v] = kv;\n    result.searchParams.set(k, v);\n  });\n  return result.toString();\n};\n\nconst imageURL = (mood) => {\n  return `/.within.website/x/cmd/anubis/static/img/${mood}.webp`;\n};\n\n(async () => {\n  const status = document.getElementById('status');\n  const image = document.getElementById('image');\n  const title = document.getElementById('title');\n  const spinner = document.getElementById('spinner');\n  // const testarea = document.getElementById('testarea');\n\n  // const videoWorks = await testVideo(testarea);\n  // console.log(`videoWorks: ${videoWorks}`);\n\n  // if (!videoWorks) {\n  //   title.innerHTML = \"Oh no!\";\n  //   status.innerHTML = \"Checks failed. Please check your browser's settings and try again.\";\n  //   image.src = imageURL(\"sad\");\n  //   spinner.innerHTML = \"\";\n  //   spinner.style.display = \"none\";\n  //   return;\n  // }\n\n  status.innerHTML = 'Calculating...';\n\n  const { challenge, difficulty } = await fetch(\"/.within.website/x/cmd/anubis/api/make-challenge\", { method: \"POST\" })\n    .then(r => {\n      if (!r.ok) {\n        throw new Error(\"Failed to fetch config\");\n      }\n      return r.json();\n    })\n    .catch(err => {\n      title.innerHTML = \"Oh no!\";\n      status.innerHTML = `Failed to fetch config: ${err.message}`;\n      image.src = imageURL(\"sad\");\n      spinner.innerHTML = \"\";\n      spinner.style.display = \"none\";\n      throw err;\n    });\n\n  status.innerHTML = `Calculating...<br/>Difficulty: ${difficulty}`;\n\n  const t0 = Date.now();\n  const { hash, nonce } = await process(challenge, difficulty);\n  const t1 = Date.now();\n\n  title.innerHTML = \"Success!\";\n  status.innerHTML = `Done! Took ${t1 - t0}ms, ${nonce} iterations`;\n  image.src = imageURL(\"happy\");\n  spinner.innerHTML = \"\";\n  spinner.style.display = \"none\";\n\n  setTimeout(() => {\n    const redir = window.location.href;\n    window.location.href = u(\"/.within.website/x/cmd/anubis/api/pass-challenge\", { response: hash, nonce, redir, elapsedTime: t1 - t0 });\n  }, 2000);\n})();"],
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-  "names": ["process", "data", "difficulty", "resolve", "reject", "webWorkerURL", "processTask", "worker", "event", "sha256", "text", "encoded", "result", "c", "hash", "nonce", "u", "url", "params", "result", "kv", "k", "v", "imageURL", "mood", "status", "image", "title", "spinner", "challenge", "difficulty", "r", "err", "t0", "hash", "nonce", "process", "t1", "redir"]
+  "sourcesContent": ["// https://dev.to/ratmd/simple-proof-of-work-in-javascript-3kgm\n\nexport function process(data, difficulty = 5, threads = navigator.hardwareConcurrency) {\n  return new Promise((resolve, reject) => {\n    let webWorkerURL = URL.createObjectURL(new Blob([\n      '(', processTask(), ')()'\n    ], { type: 'application/javascript' }));\n\n    const workers = [];\n\n    for (let i = 0; i < threads; i++) {\n      let worker = new Worker(webWorkerURL);\n\n      worker.onmessage = (event) => {\n        workers.forEach(worker => worker.terminate());\n        worker.terminate();\n        resolve(event.data);\n      };\n\n      worker.onerror = (event) => {\n        worker.terminate();\n        reject();\n      };\n\n      worker.postMessage({\n        data,\n        difficulty,\n        nonce: 1000000 * i,\n      });\n\n      workers.push(worker);\n    }\n\n    URL.revokeObjectURL(webWorkerURL);\n  });\n}\n\nfunction processTask() {\n  return function () {\n    const sha256 = (text) => {\n      const encoded = new TextEncoder().encode(text);\n      return crypto.subtle.digest(\"SHA-256\", encoded.buffer);\n    };\n\n    function uint8ArrayToHexString(arr) {\n      return Array.from(arr)\n        .map((c) => c.toString(16).padStart(2, \"0\"))\n        .join(\"\");\n    }\n\n    addEventListener('message', async (event) => {\n      let data = event.data.data;\n      let difficulty = event.data.difficulty;\n      let hash;\n      let nonce = event.data.nonce || 0;\n\n      while (true) {\n        const currentHash = await sha256(data + nonce++);\n        const thisHash = new Uint8Array(currentHash);\n        let valid = true;\n\n        for (let j = 0; j < difficulty; j++) {\n          const byteIndex = Math.floor(j / 2); // which byte we are looking at\n          const nibbleIndex = j % 2; // which nibble in the byte we are looking at (0 is high, 1 is low)\n\n          let nibble = (thisHash[byteIndex] >> (nibbleIndex === 0 ? 4 : 0)) & 0x0F; // Get the nibble\n\n          if (nibble !== 0) {\n            valid = false;\n            break;\n          }\n        }\n\n        if (valid) {\n          hash = uint8ArrayToHexString(thisHash);\n          console.log(hash);\n          break;\n        }\n      }\n\n      nonce -= 1; // last nonce was post-incremented\n\n      postMessage({\n        hash,\n        data,\n        difficulty,\n        nonce,\n      });\n    });\n  }.toString();\n}\n\n", "import { process } from './proof-of-work.mjs';\nimport { testVideo } from './video.mjs';\n\n// from Xeact\nconst u = (url = \"\", params = {}) => {\n  let result = new URL(url, window.location.href);\n  Object.entries(params).forEach((kv) => {\n    let [k, v] = kv;\n    result.searchParams.set(k, v);\n  });\n  return result.toString();\n};\n\nconst imageURL = (mood, cacheBuster) =>\n  u(`/.within.website/x/cmd/anubis/static/img/${mood}.webp`, { cacheBuster });\n\n(async () => {\n  const status = document.getElementById('status');\n  const image = document.getElementById('image');\n  const title = document.getElementById('title');\n  const spinner = document.getElementById('spinner');\n  const anubisVersion = JSON.parse(document.getElementById('anubis_version').textContent);\n\n  // const testarea = document.getElementById('testarea');\n\n  // const videoWorks = await testVideo(testarea);\n  // console.log(`videoWorks: ${videoWorks}`);\n\n  // if (!videoWorks) {\n  //   title.innerHTML = \"Oh no!\";\n  //   status.innerHTML = \"Checks failed. Please check your browser's settings and try again.\";\n  //   image.src = imageURL(\"sad\");\n  //   spinner.innerHTML = \"\";\n  //   spinner.style.display = \"none\";\n  //   return;\n  // }\n\n  status.innerHTML = 'Calculating...';\n\n  const { challenge, difficulty } = await fetch(\"/.within.website/x/cmd/anubis/api/make-challenge\", { method: \"POST\" })\n    .then(r => {\n      if (!r.ok) {\n        throw new Error(\"Failed to fetch config\");\n      }\n      return r.json();\n    })\n    .catch(err => {\n      title.innerHTML = \"Oh no!\";\n      status.innerHTML = `Failed to fetch config: ${err.message}`;\n      image.src = imageURL(\"sad\");\n      spinner.innerHTML = \"\";\n      spinner.style.display = \"none\";\n      throw err;\n    });\n\n  status.innerHTML = `Calculating...<br/>Difficulty: ${difficulty}`;\n\n  const t0 = Date.now();\n  const { hash, nonce } = await process(challenge, difficulty);\n  const t1 = Date.now();\n  console.log({ hash, nonce });\n\n  title.innerHTML = \"Success!\";\n  status.innerHTML = `Done! Took ${t1 - t0}ms, ${nonce} iterations`;\n  image.src = imageURL(\"happy\", anubisVersion);\n  spinner.innerHTML = \"\";\n  spinner.style.display = \"none\";\n\n  setTimeout(() => {\n    const redir = window.location.href;\n    window.location.href = u(\"/.within.website/x/cmd/anubis/api/pass-challenge\", { response: hash, nonce, redir, elapsedTime: t1 - t0 });\n  }, 250);\n})();"],
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+  "names": ["process", "data", "difficulty", "threads", "resolve", "reject", "webWorkerURL", "processTask", "workers", "i", "worker", "event", "sha256", "text", "encoded", "uint8ArrayToHexString", "arr", "c", "hash", "nonce", "currentHash", "thisHash", "valid", "j", "byteIndex", "nibbleIndex", "u", "url", "params", "result", "kv", "k", "v", "imageURL", "mood", "cacheBuster", "status", "image", "title", "spinner", "anubisVersion", "challenge", "difficulty", "r", "err", "t0", "hash", "nonce", "process", "t1", "redir"]
 }
diff --git a/cmd/anubis/static/js/main.mjs.zst b/cmd/anubis/static/js/main.mjs.zst
index 3f27a9e..1b71378 100644
--- a/cmd/anubis/static/js/main.mjs.zst
+++ b/cmd/anubis/static/js/main.mjs.zst