init project

.gitignore

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+lib-cov
+*.seed
+*.log
+*.csv
+*.dat
+*.out
+*.pid
+*.gz
+*.swp
+
+pids
+logs
+results
+tmp
+
+# Build
+public/css/main.css
+
+# Coverage reports
+coverage
+
+# API keys and secrets
+.env
+
+# Dependency directory
+node_modules
+bower_components
+
+# Editors
+.idea
+*.iml
+
+# OS metadata
+.DS_Store
+Thumbs.db
+
+# Ignore built ts files
+dist/**/*
+
+# ignore yarn.lock
+yarn.lock
+
+package-lock.json
+
+.bak
+.bk
+

package.json

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+{
+  "name": "snapshot-node-poc",
+  "version": "0.1.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "node -r ts-node/register src/index.ts",
+    "compile-aqua": "aqua --import . -i ./aqua/ -o ./src/_aqua",
+    "watch-aqua": "chokidar \"**/*.aqua\" -c \"npm run compile-aqua\""
+  },
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "@fluencelabs/aqua": "^0.3.1-231",
+    "chokidar-cli": "^3.0.0",
+    "ts-node": "^10.2.1",
+    "typescript": "^4.4.2"
+  },
+  "dependencies": {
+    "@fluencelabs/fluence": "0.13.0",
+    "@fluencelabs/fluence-network-environment": "1.0.10",
+    "@types/sqlite3": "^3.1.7",
+    "ethers": "^5.4.7",
+    "ethers-eip712": "^0.2.0",
+    "sqlite3": "^4.2.0"
+  }
+}

src/eip_processor.ts

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+import { ethers } from "ethers";
+// import { TypedDataUtils } from 'ethers-eip712';  // https://github.com/0xsequence/ethers-eip712
+
+// move that 
+const MAX_TS_DELTA = 180; // 3 minutes -- 60*3
+
+export interface Response {
+    peer_id: string; // may replace with random signing address for now
+    timestamp: number;
+    eip_validation: boolean;
+    ts_validation: any;
+}
+
+// local UTC epoch
+function get_local_ts(): number {
+    return Math.round(Date.now() / 1000);
+}
+
+// validate snapshot timestamp against node +/- delta allowance
+function ts_comp(peer_ts: number, snapshot_ts: number, ts_delta: number): boolean {
+    const ts_diff = Math.abs(peer_ts - snapshot_ts);
+    if (ts_diff <= ts_delta) {
+        return true;
+    }
+    return false;
+}
+
+
+function check_signature(eip_obj: any): boolean {
+    const signing_addr = ethers.utils.verifyTypedData(eip_obj.data.domain, eip_obj.data.types, eip_obj.data.message, eip_obj.sig);
+
+    // there may be an upper/lowercase hex difference
+    const sig_assert = (signing_addr == eip_obj.address);
+    console.log("sig assert: ", sig_assert);
+    return sig_assert;
+}
+
+
+export async function eip_validation(eip_str: string, peer_id: string): Promise<Response> {
+
+    const eip_obj = JSON.parse(eip_str);
+
+    // verify eip document integrity -- not working
+    // const digest = TypedDataUtils.encodeDigest(eip_obj.data);
+    // const digest_hex = ethers.utils.hexlify(digest);
+
+    // verify signed EIP hash
+    const sig_check = check_signature(eip_obj);
+
+    var response: Response;
+
+    if (!sig_check) {
+        response = { peer_id: peer_id, timestamp: get_local_ts(), eip_validation: false, ts_validation: null };
+    }
+    else {
+        // validate choices -- not implemented
+
+        // validate timestamp
+        const peer_ts = get_local_ts();
+        const ts_check = ts_comp(peer_ts, eip_obj.data.message.timestamp, MAX_TS_DELTA);
+
+        if (!ts_check) {
+            // no good
+            response = { peer_id: peer_id, timestamp: peer_ts, eip_validation: true, ts_validation: false };
+        }
+        else {
+            response = { peer_id: peer_id, timestamp: peer_ts, eip_validation: true, ts_validation: true };
+        }
+
+    }
+
+    return response;
+}

src/index.ts

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+// import { Fluence } from "@fluencelabs/fluence";
+// import { krasnodar } from "@fluencelabs/fluence-network-environment";
+// import { registerCalc, CalcDef } from "./_aqua/calc";
+
+import { ethers } from "ethers";
+import { TypedDataUtils } from 'ethers-eip712';  // https://github.com/0xsequence/ethers-eip712
+import { eip_validation, Response } from "./eip_processor";
+import { get_db, crate_table, insert_event } from './local_db';
+
+
+const DB_PATH = './data/snapshot.db';
+
+function create_wallet(): ethers.Wallet {
+  return ethers.Wallet.createRandom();
+}
+
+function sign_response(wallet: ethers.Wallet, response: Response): Promise<string> {
+  const signed_msg = wallet.signMessage(JSON.stringify(response));
+  return signed_msg;
+}
+
+
+async function main() {
+  // https://ipfs.fleek.co/ipfs/QmWGzSQFm57ohEq2ATw4UNHWmYU2HkMjtedcNLodYywpmS
+  // should come from Aqua
+  // note: I changed \" to \\" in order for JSON.parse to work
+  const eip712_doc = `{"address":"0xeF8305E140ac520225DAf050e2f71d5fBcC543e7","sig":"0xc0a90a0bf43c0b774570608bf0279143b366b7880798112b678b416a7500576b41e19f7b4eb457d58de29be3a201f700fafab1f02179da0faae653b7e8ecf82b1c","data":{"domain":{"name":"snapshot","version":"0.1.4"},"types":{"Proposal":[{"name":"from","type":"address"},{"name":"space","type":"string"},{"name":"timestamp","type":"uint64"},{"name":"type","type":"string"},{"name":"title","type":"string"},{"name":"body","type":"string"},{"name":"choices","type":"string[]"},{"name":"start","type":"uint64"},{"name":"end","type":"uint64"},{"name":"snapshot","type":"uint64"},{"name":"network","type":"string"},{"name":"strategies","type":"string"},{"name":"plugins","type":"string"},{"name":"metadata","type":"string"}]},"message":{"space":"fabien.eth","type":"single-choice","title":"This is a long title this is a long title this is a long title this is a long title this is a long title this is a long","body":"This is a long title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title title this is a long title this is a long title.","choices":["Approve","Reject"],"start":1630472400,"end":1640926800,"snapshot":9278489,"network":"4","strategies":"[{\\"name\\":\\"ticket\\",\\"params\\":{\\"value\\":100,\\"symbol\\":\\"$\\"}}]","plugins":"{}","metadata":"{}","from":"0xeF8305E140ac520225DAf050e2f71d5fBcC543e7","timestamp":1631432106}}}`;
+
+  // todo: replace with actual peer pk and sk
+  const wallet = create_wallet();
+  const peer_id = wallet.address;
+  let response = await eip_validation(eip712_doc, peer_id);
+
+
+
+  // stringify, hexlify, hash and sign response
+  const resp_str = JSON.stringify(response);
+  console.log("eip validation response: ", resp_str);
+
+  // just sign the raw message string for a long message
+  const signed_response = await wallet.signMessage(resp_str);
+  console.log("signed response: ", signed_response);
+
+  // verify
+  const address = ethers.utils.verifyMessage(resp_str, signed_response);
+  console.log("verify signature. peer_id: ", peer_id, " verified addr: ", address, " equal: ", peer_id === address);
+
+  // return (resp_str, signed_response);
+
+  var db = get_db('./data/snapshot.db');
+  // crate_table(db);
+}
+
+main();

src/local_db.ts

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+// import { sqlite3, open } from 'sqlite3';
+var sqlite3 = require("sqlite3").verbose();
+import { Response } from './eip_processor';
+
+
+
+// db handler
+export async function get_db(db_path: any) {
+    var db_path = db_path;
+
+    if (db_path === null) {
+        db_path = ':memory';
+    }
+
+    let db = new sqlite3.Database(db_path, (err: any) => {
+        if (err) {
+            return console.error("failure to get sqlite: ", err.message);
+        }
+    });
+    return db;
+
+}
+
+export async function crate_table(db: any) {
+    const stmt = `create table if not exists snapshot.db (
+        snapshot_id: integer primary key,
+        event_address: text,
+        event_signature: text,
+        eip712_doc text,
+        peer_id: text,
+        timestamp: integer;
+        eip_validation: boolean;
+        ts_validation: boolean;
+        signed_response text
+    )`;
+
+    db.run(stmt);
+}
+
+export async function insert_event(db: any, eip_obj: any, response_obj: Response, signed_msg: string) {
+    const stmt = `insert into snapshot.db (
+        values (?,?,?,?,?,?,?,?,?)
+    )`;
+    const values = [eip_obj.data.message.snapshot, eip_obj.address, eip_obj.sig, JSON.stringify(eip_obj.data), response_obj.peer_id, response_obj.timestamp, response_obj.eip_validation, response_obj.ts_validation, signed_msg];
+    db.run(stmt, values, function (err: any) {
+        if (err) {
+            return console.log(err.message);
+        }
+        // console.log(`A row has been inserted with row id: ${this.lastID}`);
+        // console.log(`A row has been inserted with row id: ${db.}`);
+    });
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig.json to read more about this file */
+
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "./dist",                       /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "skipLibCheck": true,                     /* Skip type checking of declaration files. */
+    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
+  }
+}