commit 29c8eb3d1f9ef584f7dffe1ebe9130e09adf00dd
Author: Andre Staltz <andre@staltz.com>
Date:   Thu Jun 22 13:37:29 2023 +0300

    init

diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
new file mode 100644
index 0000000..7ea0e5f
--- /dev/null
+++ b/.github/workflows/node.js.yml
@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        node-version: [16.x, 18.x, 20.x]
+        os: [ubuntu-latest]
+
+    runs-on: ${{ matrix.os }}
+    timeout-minutes: 2
+
+    steps:
+      - name: Checkout the repo
+        uses: actions/checkout@v2
+      - name: Set up Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm test
diff --git a/.gitignore b/.gitignore
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index 0000000..44bcc03
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+node_modules
+.nyc_output
+coverage
+pnpm-lock.yaml
\ No newline at end of file
diff --git a/.prettierrc.yaml b/.prettierrc.yaml
new file mode 100644
index 0000000..1d2127c
--- /dev/null
+++ b/.prettierrc.yaml
@@ -0,0 +1,2 @@
+semi: false
+singleQuote: true
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..9b34bc1
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,20 @@
+The MIT License (MIT)
+
+Copyright (c) 2023 Andre 'Staltz' Medeiros
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ceba577
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# ppppp-invite
+
+**Work in progress**
diff --git a/lib/index.js b/lib/index.js
new file mode 100644
index 0000000..a9668e3
--- /dev/null
+++ b/lib/index.js
@@ -0,0 +1,231 @@
+// @ts-ignore
+const MultiserverAddress = require('multiserver-address')
+const p = require('promisify-tuple')
+
+/**
+ * @template T
+ * @typedef {(...args: [NodeJS.ErrnoException] | [null, T]) => void} CB<T>
+ */
+
+/**
+ * @typedef {{
+ *   type: 'follow' | 'join',
+ *   hubs: number,
+ *   id?: string,
+ *   _hubMsAddr?: string,
+ * }} CreateOpts
+ *
+ * @typedef {{type: 'join', address: string}} JoinCommand
+ * @typedef {{type: 'follow', id: string}} FollowCommand
+ * @typedef {{
+ *   type: 'promise.follow',
+ *   issuer: string,
+ *   issuerType: 'pubkey' | 'identity',
+ *   token: string
+ * }} PromiseFollowCommand
+ * @typedef {JoinCommand | FollowCommand | PromiseFollowCommand} Command
+ */
+
+/**
+ * @param {Array<string>} pieces
+ * @param {string} uri
+ * @returns {JoinCommand}
+ */
+function parseJoinCommand(pieces, uri) {
+  const [, host, port, pubkey, token] = pieces
+  if (!host) {
+    // prettier-ignore
+    throw new Error(`Invalid URI "${uri}" for invite.parse, missing join hub address`)
+  }
+  // TODO: numeric validation for the port
+  if (!port) {
+    // prettier-ignore
+    throw new Error(`Invalid URI "${uri}" for invite.parse, missing join hub port`)
+  }
+  // TODO: base58 validation for the pubkey
+  if (!pubkey) {
+    // prettier-ignore
+    throw new Error(`Invalid URI "${uri}" for invite.parse, missing join hub pubkey`)
+  }
+  // TODO: base58 validation for the token
+  if (!token) {
+    // prettier-ignore
+    throw new Error(`Invalid URI "${uri}" for invite.parse, missing join hub token`)
+  }
+  pieces.shift()
+  pieces.shift()
+  pieces.shift()
+  pieces.shift()
+  pieces.shift()
+  const shse = `shse:${pubkey}.${token}`
+  const address = `net:${host}:${port}~${shse}` // TODO: add ws address here
+  return { type: 'join', address }
+}
+
+/**
+ * @param {Array<string>} pieces
+ * @param {string} uri
+ * @returns {FollowCommand}
+ */
+function parseFollowCommand(pieces, uri) {
+  const [, id] = pieces
+  if (!id) {
+    // prettier-ignore
+    throw new Error(`Invalid URI "${uri}" for invite.parse, missing follow id`)
+  }
+  pieces.shift()
+  pieces.shift()
+  return { type: 'follow', id }
+}
+
+/**
+ * @param {Array<string>} pieces
+ * @param {string} uri
+ * @returns {PromiseFollowCommand}
+ */
+function parsePromiseFollowCommand(pieces, uri) {
+  const [, issuerAndType, token] = pieces
+  if (!issuerAndType) {
+    // prettier-ignore
+    throw new Error(`Invalid URI "${uri}" for invite.parse, missing promise.follow issuer`)
+  }
+  if (!token) {
+    // prettier-ignore
+    throw new Error(`Invalid URI "${uri}" for invite.parse, missing promise.follow token`)
+  }
+  pieces.shift()
+  pieces.shift()
+  pieces.shift()
+  const [issuerType, issuer] = issuerAndType.split('.')
+  if (issuerType !== 'pubkey' && issuerType !== 'identity') {
+    // prettier-ignore
+    throw new Error(`Invalid URI "${uri}" for invite.parse, invalid promise.follow issuer type "${issuerType}"`)
+  }
+  return { type: 'promise.follow', issuer, issuerType, token }
+}
+
+/**
+ * @param {`ppppp://invite/${string}`} uri
+ * @returns {Array<Command>}
+ */
+function parse(uri) {
+  const url = new URL(uri)
+  if (url.protocol !== 'ppppp:') {
+    throw new Error(
+      `Invalid protocol in URI "${uri}" for invite.parse, expected "ppppp:"`
+    )
+  }
+  if (url.host !== 'invite') {
+    throw new Error(
+      `Invalid host in URI "${uri}" for invite.parse, expected "invite"`
+    )
+  }
+  const pieces = url.pathname.startsWith('/')
+    ? url.pathname.substring(1).split('/')
+    : url.pathname.split('/')
+
+  const commands = []
+  while (pieces.length > 0) {
+    switch (pieces[0]) {
+      case 'join':
+        commands.push(parseJoinCommand(pieces, uri))
+        break
+      case 'follow':
+        commands.push(parseFollowCommand(pieces, uri))
+        break
+      case 'promise.follow':
+        commands.push(parsePromiseFollowCommand(pieces, uri))
+        break
+      default:
+        console.log('Unknown command', pieces[0])
+        pieces.shift()
+        break
+    }
+  }
+
+  return commands
+}
+
+module.exports = {
+  name: 'invite',
+  manifest: {
+    create: 'async',
+    parse: 'sync',
+  },
+
+  parse,
+
+  /**
+   * @param {any} sstack
+   * @param {any} config
+   */
+  init(sstack, config) {
+    if (!sstack.promise?.create) {
+      throw new Error('ppppp-invite plugin requires ppppp-promise plugin')
+    }
+    if (!sstack.conn?.connect) {
+      throw new Error('ppppp-invite plugin requires ssb-conn plugin')
+    }
+
+    /**
+     * @param {CreateOpts} opts
+     * @param {CB<string>} cb
+     */
+    async function create(opts, cb) {
+      if (typeof opts !== 'object') {
+        return cb(new Error('invite.create is missing opts argument'))
+      }
+      const type = opts.type ?? 'follow'
+      if (type !== 'follow' && type !== 'join') {
+        // prettier-ignore
+        return cb(new Error(`invite.create opts.type should be "follow" or "join" but was "${type}"`))
+      }
+      if (type === 'follow' && !opts.id) {
+        // prettier-ignore
+        return cb(new Error(`invite.create opts.id is required for type "follow"`))
+      }
+      const hubs = opts.hubs ?? 1
+      if (typeof hubs !== 'number') {
+        // prettier-ignore
+        return cb(new Error(`invite.create opts.hubs should be a number but was ${hubs}`))
+      }
+
+      if (!opts._hubMsAddr) {
+        // prettier-ignore
+        return cb(new Error(`invite.create expected opts._hubMsAddr because loading from connDB not yet supported`))
+      }
+
+      // Connect to hub and create token
+      const [err, rpc] = await p(sstack.conn.connect)(opts._hubMsAddr);
+      if (err) return cb(err)
+      const [err2, hubToken] = await p(rpc.hub.createToken)()
+      if (err2) return cb(err2)
+
+      // Parse multiserver address
+      // prettier-ignore
+      const ERROR_MSG = `Invalid multiserver address ${opts._hubMsAddr} for invite.create`
+      const msAddr = MultiserverAddress.decode(opts._hubMsAddr)
+      const [netShsAddr, wsShsAddr] = msAddr
+      if (!netShsAddr) return cb(new Error(ERROR_MSG))
+      const [net, shse] = netShsAddr
+      if (!net) return cb(new Error(ERROR_MSG))
+      if (net.name !== 'net') return cb(new Error(ERROR_MSG))
+      const [host, port] = net.data
+      if (!shse) return cb(new Error(ERROR_MSG))
+      if (shse.name !== 'shse') return cb(new Error(ERROR_MSG))
+      const [pubkey] = shse.data
+
+      // Create follow promise
+      const [err3, token] = await p(sstack.promise.create)({type: 'follow'})
+      if (err3) return cb(err3)
+
+      const joinCommand = `join/${host}/${port}/${pubkey}/${hubToken}`
+      const followCommand = `follow/${opts.id}`
+      const promiseCommand = `promise.follow/identity.${opts.id}/${token}`
+      const uri = `ppppp://invite/${joinCommand}/${followCommand}/${promiseCommand}`
+      cb(null, uri)
+    }
+
+    return { create, parse }
+  },
+}
diff --git a/package.json b/package.json
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--- /dev/null
+++ b/package.json
@@ -0,0 +1,55 @@
+{
+  "name": "ppppp-invite",
+  "version": "0.0.1",
+  "description": "PPPPP invite code generator and parser",
+  "homepage": "https://github.com/staltz/ppppp-invite",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/staltz/ppppp-invite.git"
+  },
+  "author": "Andre 'Staltz' Medeiros <contact@staltz.com>",
+  "license": "MIT",
+  "type": "commonjs",
+  "main": "lib/index.js",
+  "files": [
+    "lib/**/*"
+  ],
+  "engines": {
+    "node": ">=16"
+  },
+  "exports": {
+    ".": {
+      "require": "./lib/index.js"
+    }
+  },
+  "dependencies": {
+    "multiserver-address": "~1.0.1",
+    "promisify-tuple": "1.2.0"
+  },
+  "devDependencies": {
+    "@types/node": "^20.2.5",
+    "c8": "^7.11.0",
+    "husky": "^4.3.0",
+    "ppppp-caps": "github:staltz/ppppp-caps",
+    "ppppp-keypair": "github:staltz/ppppp-keypair",
+    "ppppp-promise": "file:../promise",
+    "prettier": "^2.6.2",
+    "pretty-quick": "^3.1.3",
+    "rimraf": "^5.0.1",
+    "secret-handshake-ext": "~0.0.6",
+    "secret-stack": "^6.4.2",
+    "typescript": "^5.0.2"
+  },
+  "scripts": {
+    "build": "tsc",
+    "test": "node --test",
+    "format-code": "prettier --write \"*.js\" \"(test|lib)/*.js\"",
+    "format-code-staged": "pretty-quick --staged --pattern \"*.js\" --pattern \"(test|lib)/*.js\"",
+    "coverage": "c8 --reporter=lcov npm run test"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "pretty-quick --staged"
+    }
+  }
+}
diff --git a/test/create.test.js b/test/create.test.js
new file mode 100644
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--- /dev/null
+++ b/test/create.test.js
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+const test = require('node:test')
+const assert = require('node:assert')
+const Path = require('node:path')
+const os = require('node:os')
+const p = require('node:util').promisify
+const rimraf = require('rimraf')
+const Keypair = require('ppppp-keypair')
+const caps = require('ppppp-caps')
+
+test('create()', async (t) => {
+  const path = Path.join(os.tmpdir(), 'ppppp-promise-create-0')
+  rimraf.sync(path)
+  const keypair = Keypair.generate('ed25519', 'alice')
+
+  let connectCalled = false
+  let createTokenCalled = false
+  let createPromiseCalled = false
+
+  const mockConn = {
+    name: 'conn',
+    manifest: {
+      connect: 'async',
+    },
+    init() {
+      return {
+        connect(address, cb) {
+          connectCalled = true
+          assert.equal(address, 'net:example.com:8008~shse:HUB_PUBKEY')
+          const mockRpc = {
+            hub: {
+              createToken(cb) {
+                createTokenCalled = true
+                cb(null, 'MOCK_TOKEN')
+              },
+            },
+          }
+          cb(null, mockRpc)
+        },
+      }
+    },
+  }
+
+  const mockPromise = {
+    name: 'promise',
+    manifest: {
+      create: 'async',
+    },
+    init() {
+      return {
+        create(opts, cb) {
+          createPromiseCalled = true
+          assert.deepEqual(opts, { type: 'follow' })
+          cb(null, 'MOCK_PROMISE')
+        },
+      }
+    },
+  }
+
+  const stack = require('secret-stack/lib/api')([], {})
+    .use(require('secret-stack/lib/core'))
+    .use(require('secret-stack/lib/plugins/net'))
+    .use(require('secret-handshake-ext/secret-stack'))
+    .use(mockConn)
+    .use(mockPromise)
+    .use(require('../lib'))
+    .call(null, {
+      path,
+      caps,
+      keypair,
+      connections: {
+        outgoing: {
+          net: [{ transform: 'shse' }],
+        },
+      },
+    })
+
+  const uri = await p(stack.invite.create)({
+    _hubMsAddr: 'net:example.com:8008~shse:HUB_PUBKEY',
+    id: 'MOCK_ID',
+  })
+  assert.equal(
+    uri,
+    `ppppp://invite/join/example.com/8008/HUB_PUBKEY/MOCK_TOKEN/follow/MOCK_ID/promise.follow/identity.MOCK_ID/MOCK_PROMISE`
+  )
+
+  assert.ok(connectCalled)
+  assert.ok(createTokenCalled)
+  assert.ok(createPromiseCalled)
+  await p(stack.close)()
+})
diff --git a/test/parse.test.js b/test/parse.test.js
new file mode 100644
index 0000000..c7f3270
--- /dev/null
+++ b/test/parse.test.js
@@ -0,0 +1,37 @@
+const test = require('node:test')
+const assert = require('node:assert')
+const plugin = require('../lib/index')
+
+test('parse() error cases', (t) => {
+  assert.throws(() => {
+    plugin.parse('ssb://invite/join/HUB_ADDR/HUB_PUBKEY/HUB_TOKEN')
+  })
+  assert.throws(() => {
+    plugin.parse('ppppp:invite')
+  })
+  assert.throws(() => {
+    plugin.parse('ppppp:invite/join/HUB_ADDR')
+  })
+})
+
+test('parse() good cases', (t) => {
+  const commands = plugin.parse(
+    'ppppp://invite/join/HOST/PORT/PUBKEY/TOKEN/follow/ALICE/promise.follow/identity.ALICE/ALICE_TOKEN'
+  )
+  assert.deepEqual(commands, [
+    {
+      type: 'join',
+      address: 'net:HOST:PORT~shse:PUBKEY.TOKEN',
+    },
+    {
+      type: 'follow',
+      id: 'ALICE',
+    },
+    {
+      type: 'promise.follow',
+      issuerType: 'identity',
+      issuer: 'ALICE',
+      token: 'ALICE_TOKEN',
+    },
+  ])
+})
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..f6eb639
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,15 @@
+{
+  "include": ["lib/**/*.js"],
+  "exclude": ["coverage/", "node_modules/", "test/"],
+  "compilerOptions": {
+    "checkJs": true,
+    "noEmit": true,
+    "exactOptionalPropertyTypes": true,
+    "forceConsistentCasingInFileNames": true,
+    "lib": ["es2021", "dom"],
+    "module": "node16",
+    "skipLibCheck": true,
+    "strict": true,
+    "target": "es2021"
+  }
+}
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