Start VERY basic ActivityPub implementation - user endpoint and webfinger acct: support

src/app/http/controllers/pub/Webfinger.controller.ts

@@ -0,0 +1,41 @@
+import {Controller, ErrorWithContext, http, HTTPStatus, Injectable, json} from '@extollo/lib'
+import {User} from '../../../models/User.model'
+
+@Injectable()
+export class Webfinger extends Controller {
+
+    async getUser() {
+        const username = this.request.safe('username').string()
+
+        // @ts-ignore
+        const user = await User.query<User>()
+            .where('username', '=', username)
+            .first()
+
+        if ( !user ) {
+            return http(HTTPStatus.NOT_FOUND)
+        }
+
+        return json(await user.toPub())
+    }
+
+    async getWebfinger() {
+        const resource = this.request.safe('resource').string()
+        if ( !resource.startsWith('acct:') || !resource.endsWith('@garrettmills.dev') ) {  // fixme
+            throw new ErrorWithContext('Invalid webfinger resource query', { resource })
+        }
+
+        const username = resource.slice('acct:'.length, -('@garrettmills.dev'.length))  // fixme
+        // @ts-ignore
+        const user = await User.query<User>()
+            .where('username', '=', username)
+            .first()
+
+        if ( !user ) {
+            return http(HTTPStatus.NOT_FOUND)
+        }
+
+        return json(await user.toWebfinger())
+    }
+
+}

src/app/http/routes/pub.routes.ts

@@ -0,0 +1,10 @@
+import {Route} from '@extollo/lib'
+import {Webfinger} from '../controllers/pub/Webfinger.controller'
+
+Route.get('/.well-known/webfinger')
+	.calls<Webfinger>(Webfinger, w => w.getWebfinger)
+
+Route.group('/pub', () => {
+	Route.get('/:username')
+		.calls<Webfinger>(Webfinger, w => w.getUser)
+})

src/app/migrations/2023-11-07T04:03:41.732Z_CreatePubCertificatesTableMigration.migration.ts

@@ -0,0 +1,52 @@
+import {Injectable, Migration, Inject, DatabaseService, FieldType} from '@extollo/lib'
+
+/**
+ * CreatePubCertificatesTableMigration
+ * ----------------------------------
+ * Put some description here.
+ */
+@Injectable()
+export default class CreatePubCertificatesTableMigration extends Migration {
+    @Inject()
+    protected readonly db!: DatabaseService
+
+    /**
+     * Apply the migration.
+     */
+    async up(): Promise<void> {
+        const schema = this.db.get().schema()
+        const table = await schema.table('pub_certificates')
+
+        table.primaryKey('certificate_id')
+
+        table.column('reltype')
+            .type(FieldType.varchar)
+
+        table.column('relid')
+            .type(FieldType.bigint)
+
+        table.column('pubkey')
+            .type(FieldType.text)
+
+        table.column('privkey')
+            .type(FieldType.text)
+
+        table.index('pub_cert_rel')
+            .field('reltype')
+            .field('relid')
+
+        await schema.commit(table)
+    }
+
+    /**
+     * Undo the migration.
+     */
+    async down(): Promise<void> {
+        const schema = this.db.get().schema()
+        const table = await schema.table('pub_certificates')
+
+        table.dropIfExists()
+
+        await schema.commit(table)
+    }
+}

src/app/models/User.model.ts

@@ -1,5 +1,77 @@
-import {ORMUser} from '@extollo/lib'
+import {Maybe, ModelBuilder, ORMUser, Related} from '@extollo/lib'
+import {Pub} from '../../pub/types'
+import {Certificate} from './pub/Certificate.model'
+import * as child_process from 'child_process'
 
 export class User extends ORMUser {
-
+    get pubUrl(): string {
+        return `https://garrettmills.dev/pub/${this.username}`
+    }
+
+    async toWebfinger(): Promise<Pub.Webfinger> {
+        return {
+            subject: `acct:${this.username}@garrettmills.dev`,  // fixme
+            links: [
+                {
+                    rel: 'self',
+                    type: 'application/activity+json',
+                    href: this.pubUrl,
+                },
+            ],
+        }
+    }
+
+    async toPub(): Promise<Pub.Actor> {
+        return {
+            "@context": [
+                "https://www.w3.org/ns/activitystreams",
+                "https://w3id.org/security/v1"
+            ],
+            id: this.pubUrl,
+            type: 'Person',
+            preferredUsername: this.username,
+            inbox: `${this.pubUrl}/inbox`,
+            publicKey: {
+                id: `${this.pubUrl}#main-key`,
+                owner: this.pubUrl,
+                publicKeyPem: await this.getCertificate().then(c => c.pubkey),
+            },
+        }
+    }
+
+    certificate(): Promise<Maybe<Certificate>> {
+        return Certificate.query<Certificate>()
+            .where('reltype', '=', 'user')
+            .where('relid', '=', this.userId)
+            .first()
+    }
+
+    async getCertificate(): Promise<Certificate> {
+        const existing = await this.certificate()
+        if ( existing ) {
+            return existing
+        }
+
+        const certificate = this.make<Certificate>(Certificate)
+        certificate.reltype = 'user'
+        certificate.relid = this.userId
+        certificate.privkey = await this.exec('openssl genrsa -out - 2048')
+        certificate.pubkey = await this.exec(`echo "${certificate.privkey}" | openssl rsa -outform PEM -pubout -out -`)
+        await certificate.save()
+
+        return certificate
+    }
+
+    /** Dirty, dirty, dirty. @fixme */
+    private async exec(cmd: string): Promise<string> {
+        return new Promise<string>((res, rej) => {
+            child_process.exec(cmd, (err, stdout, stderr) => {
+                if ( err ) {
+                    return rej(err)
+                }
+
+                res(stdout.trim())
+            })
+        })
+    }
 }

src/app/models/pub/Certificate.model.ts

@@ -0,0 +1,22 @@
+import {Injectable, Model, Field, FieldType} from '@extollo/lib'
+
+@Injectable()
+export class Certificate extends Model<Certificate> {
+    protected static table = 'pub_certificates'
+    protected static key = 'certificate_id'
+
+    @Field(FieldType.serial, 'certificate_id')
+    public certificateId?: number
+
+    @Field(FieldType.varchar)
+    public reltype: 'user' = 'user'
+
+    @Field(FieldType.bigint)
+    public relid!: number
+
+    @Field(FieldType.text)
+    public pubkey!: string
+
+    @Field(FieldType.text)
+    public privkey!: string
+}

src/pub/types/index.ts

@@ -0,0 +1,39 @@
+
+export namespace Pub {
+    const ACCEPT_TYPE = 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'
+
+    export interface Config {
+        uri: string,
+    }
+
+    export interface Object {
+        id: string,
+        type: string,  // FIXME
+    }
+
+    export interface Actor extends Object {
+        ["@context"]: [
+            "https://www.w3.org/ns/activitystreams",
+            "https://w3id.org/security/v1"
+        ],
+        type: 'Person',
+        preferredUsername: string,
+        inbox: string,
+        publicKey: {
+            id: string,
+            owner: string,
+            publicKeyPem: string,
+        },
+    }
+
+    export interface Link {
+        rel: string,
+        type: string,
+        href: string,
+    }
+
+    export interface Webfinger {
+        subject: string,
+        links: Link[],
+    }
+}