start implementing asset-api and m2m comms with identity-api

.gitignore

@@ -0,0 +1,2 @@
+.keys/
+.assets/

asset-api/index.js

@@ -1,13 +1,68 @@
+import { readFileSync } from "node:fs"
+import { createSign } from "node:crypto";
 import Fastify from "fastify";
 
+const { private: M2M_PRIVATE_KEY, public: M2M_PUBLIC_KEY } = loadM2MKeys()
+const M2M_ALGORITHM = "RSA-SHA512"
+
+const ASSETS_FOLDER = "~/.assets/"
 const ASSET_API_LANDING_MESSAGE = "asset-api v1.0.0"
 
+const IDENTITY_API_ENDPOINT = "http://localhost:3000"
+
 const fastify = new Fastify({
     logger: true,
 })
 
 fastify.get("/", async (request, reply) => {
-    return ASSET_API_LANDING_MESSAGE
+    return signString(ASSET_API_LANDING_MESSAGE)
+})
+
+fastify.get("/crypto/cert", async (request, reply) => {
+    return M2M_PUBLIC_KEY
+})
+
+fastify.get("/crypto/algo", (request, reply) => {
+    return M2M_ALGORITHM
+})
+
+fastify.get("/asset", {
+    async handler(request, reply) {
+        let url = new URL(IDENTITY_API_ENDPOINT)
+        url.pathname = "/auth/account/fromkey"
+
+        let res = await fetch(url, {
+            method: "POST",
+            body: signString(JSON.stringify({
+                session_key: request.query.session_key,
+            }))
+        })
+
+        return await res.text()
+    },
+    schema: {
+        query: {
+            type: "object",
+            properties: {
+                id: { type: "string" },
+                session_key: { type: "string" },
+            },
+            required: ["id", "session_key"],
+        },
+    },
 })
 
 fastify.listen({ port: 3001 })
+
+function loadM2MKeys() {
+    return {
+        private: readFileSync("../.keys/m2m-dev.pem").toString("ascii"),
+        public: readFileSync("../.keys/m2m-dev.pub").toString("ascii"),
+    }
+}
+
+function signString(content) {
+    let sign = createSign(M2M_ALGORITHM)
+    sign.update(content)
+    return `-----BEGIN SIGNED MESSAGE-----\n\n${content}\n\n-----BEGIN SIGNATURE-----\n\n${sign.sign(M2M_PRIVATE_KEY, "base64")}\n-----END SIGNATURE-----`
+}

identity-api/index.js

@@ -1,6 +1,8 @@
+import { createVerify } from "node:crypto"
 import Fastify from 'fastify';
 import * as Jose from 'jose';
 import { v4 as uuidv4 } from 'uuid'
+import assert from "node:assert";
 
 const IDENTITY_API_LANDING_MESSAGE = 'identity-api v1.0.0';
 const JWT_SECRET = new TextEncoder().encode(
@@ -8,6 +10,15 @@ const JWT_SECRET = new TextEncoder().encode(
 )
 const JWT_ALG = 'HS256'
 
+const ASSET_API_ENDPOINT = "http://localhost:3001/"
+const ASSET_API_PUBKEY = await loadAssetPubkey()
+const ASSET_API_ALGORITHM = await loadAssetAlgo()
+
+let session_keys = {
+    'uid:005d6417-a23c-48bd-b348-eafeae649b94': 'e381ba8c-e18a-4bca-afce-b212b37bc26b',
+    'key:e381ba8c-e18a-4bca-afce-b212b37bc26b': '005d6417-a23c-48bd-b348-eafeae649b94'
+};
+
 let users = {
     'jane@identity.net': {
         uid: '005d6417-a23c-48bd-b348-eafeae649b94',
@@ -24,6 +35,47 @@ fastify.get('/', async (request, reply) => {
     return IDENTITY_API_LANDING_MESSAGE;
 })
 
+fastify.post("/auth/account/fromkey", {
+    async handler(request, reply) {
+        if (!verifySignature(request.body, ASSET_API_PUBKEY)) {
+            reply.statusCode(401)
+        }
+
+        let body = JSON.parse(getContentFromSigned(request.body))
+
+        let uid = session_keys[`key:${body.session_key}`]
+        let user = Object.values(users).filter(v => v.uid === uid)
+
+        assert(user.length === 1)
+        user[0].password = undefined
+
+        return user[0]
+    }
+})
+
+fastify.get('/auth/genkey', {
+    async handler(request, reply) {
+        let jwt = request.headers['authorization'].replace('Bearer', '').trim()
+        let { payload } = await Jose.jwtVerify(jwt, JWT_SECRET)
+
+        let key = uuidv4()
+        session_keys[`uid:${payload.uid}`] = key
+        session_keys[`key:${key}`] = payload.uid
+
+        return {
+            session_key: session_keys[payload.uid]
+        }
+    },
+    schema: {
+        headers: {
+            type: 'object',
+            properties: {
+                authorization: { type: 'string' },
+            },
+        },
+    },
+})
+
 fastify.get('/auth/account', {
     async handler(request, reply) {
         let jwt = request.headers['authorization'].replace('Bearer', '').trim()
@@ -119,3 +171,52 @@ fastify.post('/auth/register', {
 })
 
 fastify.listen({ port: 3000 })
+
+async function loadAssetPubkey() {
+    let url = new URL(ASSET_API_ENDPOINT)
+    url.pathname = "/crypto/cert"
+
+    let res = await fetch(url)
+    return await res.text()
+}
+
+async function loadAssetAlgo() {
+    let url = new URL(ASSET_API_ENDPOINT)
+    url.pathname = "/crypto/algo"
+
+    let res = await fetch(url)
+    return await res.text()
+}
+
+/**
+ * 
+ * @param {string} content 
+ * @param {string} pubkeyText 
+ */
+function verifySignature(content, pubkeyText) {
+    let parts = content
+        .replace("-----BEGIN SIGNED MESSAGE-----\n\n", "")
+        .replace("\n-----END SIGNATURE-----", "")
+        .split("\n\n-----BEGIN SIGNATURE-----\n\n")
+    
+    assert(parts.length === 2);
+
+    let verify = createVerify(ASSET_API_ALGORITHM)
+    verify.update(parts[0])
+
+    let pubkey = Buffer.from(pubkeyText, "ascii")
+    let digest = Buffer.from(parts[1], "base64")
+
+    return verify.verify(pubkey, digest)
+}
+
+function getContentFromSigned(content) {
+    let parts = content
+        .replace("-----BEGIN SIGNED MESSAGE-----\n\n", "")
+        .replace("\n-----END SIGNATURE-----", "")
+        .split("\n\n-----BEGIN SIGNATURE-----\n\n")
+    
+    assert(parts.length === 2);
+
+    return parts[0]
+}