@reclaimprotocol/browser-extension-sdk/build/scripts/download-circuits.js

This guide will walk you through integrating the Reclaim Protocol Browser Extension SDK into your own browser extension or web application. It covers installation, manifest configuration, background initialization, content script setup, and how to trigg

const fs=require("fs"),path=require("path"),https=require("https"),REPO="reclaimprotocol/zk-symmetric-crypto",TARGET_DIR=path.join(process.cwd(),"public","browser-rpc","resources"),TEMP_DIR=path.join(process.cwd(),"zk-resources");function getLatestCommitHash(){return new Promise((e,t)=>{const o=`https://api.github.com/repos/${REPO}/commits/HEAD`,r=https.get(o,{headers:{"User-Agent":"Node.js"}},o=>{let r="";o.on("data",e=>r+=e),o.on("end",()=>{try{const o=JSON.parse(r);o.sha?e(o.sha):t(new Error("No SHA found in GitHub API response"))}catch(e){t(new Error(`Failed to parse GitHub API response: ${e.message}`))}})});r.on("error",t),r.setTimeout(1e4,()=>{r.destroy(),t(new Error("Timeout fetching latest commit hash"))})})}function getFileSize(e,t,o=null){return o||(o=`https://github.com/${REPO}/raw/${t}/resources/${e}`),new Promise((r,s)=>{const n=https.request(o,{method:"HEAD"},o=>{if([301,302].includes(o.statusCode)&&o.headers.location)return r(getFileSize(e,t,o.headers.location));const s=parseInt(o.headers["content-length"],10);r(isNaN(s)?0:s)});n.on("error",s),n.end()})}async function downloadFile(e,t,o,r,s=null,n=3){s||(s=`https://github.com/${REPO}/raw/${r}/resources/${e}`);const a=path.dirname(t);await fs.promises.mkdir(a,{recursive:!0});for(let a=1;a<=n;a++)try{return await new Promise((n,a)=>{const i=fs.createWriteStream(t),c=https.get(s,s=>{if([301,302].includes(s.statusCode)&&s.headers.location)return downloadFile(e,t,o,r,s.headers.location).then(n).catch(a);s.on("data",e=>{o(e.length)}),s.pipe(i),i.on("finish",()=>{i.close(n)})});c.on("error",e=>{fs.unlink(t,()=>a(e))}),c.setTimeout(3e4,()=>{c.destroy(),a(new Error(`Timeout downloading ${e}`))})})}catch(t){if(a===n)throw new Error(`Failed to download ${e} after ${n} attempts: ${t.message}`);console.log(`\nRetry ${a}/${n} for ${e}: ${t.message}`),await new Promise(e=>setTimeout(e,1e3*Math.pow(2,a)))}}function formatBytes(e){const t=["B","KB","MB","GB"];let o=0;for(;e>=1024&&o<t.length-1;)e/=1024,o++;return`${e.toFixed(1)} ${t[o]}`}function renderProgress(e,t,o,r,s,n){const a=Math.min(r>0?o/r:0,1),i=Math.round(25*a),c=Math.max(0,25-i),l="█".repeat(i)+"░".repeat(c),d=s>0?Math.max(0,r-o)/s:0,m=(100*a).toFixed(1).padStart(5),p=`${formatBytes(s)}/s`,h=isFinite(d)?`${Math.round(d)}s`.padStart(4):"--";return`[${e.toString().padStart(2)}/${t}] ${m}% [${l}] Speed: ${p} Time Left: ${h} | ${n}`}async function main(){try{console.log("🔄 Fetching latest commit hash...");const e=await getLatestCommitHash();console.log(`📝 Using commit: ${e}`),await fs.promises.mkdir(TARGET_DIR,{recursive:!0});const t=["circuit_final.zkey","circuit.wasm","circuit.r1cs"],o=[...["chacha20","aes-256-ctr","aes-128-ctr"].flatMap(e=>t.map(t=>`snarkjs/${e}/${t}`))];if(await Promise.all(o.map(async e=>{try{return await fs.promises.access(path.join(TARGET_DIR,e)),!0}catch{return!1}})).then(e=>e.every(e=>e)))return console.log("ZK files already exist in target directory, skipping download."),void process.exit(0);await fs.promises.rm(TEMP_DIR,{recursive:!0,force:!0}),await fs.promises.mkdir(TEMP_DIR,{recursive:!0}),console.log("📦 Downloading ZK files ");const r=o.length;console.log("🔍 Fetching file information... please wait");let s={},n=0;for(const t of o)try{const o=await getFileSize(t,e);s[t]=o,n+=o}catch(e){s[t]=0}let a=0,i=0;const c=Date.now();process.stdout.write("[?25l");for(const t of o){const o=path.join(TEMP_DIR,t);let s=0;await downloadFile(t,o,e=>{s+=e,i+=e;const o=(Date.now()-c)/1e3,l=renderProgress(a,r,i,n,o>0?i/o:0,path.basename(t));process.stdout.write("\r"+l)},e),a++;const l=(Date.now()-c)/1e3,d=renderProgress(a,r,i,n,l>0?i/l:0,path.basename(t));process.stdout.write("\r"+d)}process.stdout.write("[?25h\n"),console.log("\nMoving files to final location..."),await fs.promises.rm(TARGET_DIR,{recursive:!0,force:!0}),await fs.promises.rename(TEMP_DIR,TARGET_DIR),console.log("Download completed successfully!"),process.exit(0)}catch(e){process.stdout.write("[?25h\n"),console.error("\nFatal error during download:",e),await fs.promises.rm(TEMP_DIR,{recursive:!0,force:!0}),process.exit(1)}}process.on("unhandledRejection",e=>{console.error("Unhandled promise rejection:",e),process.exit(1)}),main();