Bsky link card service (#4547)

* setup bskycard

* quick proof of concept for png card generation

* bskycard: use jsx

* bskycard: 3x5 profile layout

* bskycard: add butterfly overlay

* bskycard: tidy

* bskycard: separate and reorganize

* bskycard: tidy

* bskycard: tidy

* bskycard: tidy

* bskycard: poc of transparent overlay and box shadow

* bskycard: reorg impl into src/ directory

* bskycard: use more standard app structure

* bskycard: setup dockerfile, fix build

* bskycard: support for x-origin-verify

* bskycard: card layout, filter images based on labels

* bskycard: tidy

* bskycard: support cluster mode

* bskycard: handle error fetching starter pack info

* bskycard: tidy

* bskycard: fix leak on failed image fetch

* bskycard: build workflow

* bskyogcard: rename from bskycard

* bskyogcard: fix some express plumbing

* bskyogcard: add cdn tags, tidy

1 files changed, 41 insertions, 0 deletions

diff --git a/bskyogcard/src/index.ts b/bskyogcard/src/index.ts
new file mode 100644
index 000000000..ef8d48494
--- /dev/null
+++ b/bskyogcard/src/index.ts
@@ -0,0 +1,41 @@
+import events from 'node:events'
+import http from 'node:http'
+
+import express from 'express'
+import {createHttpTerminator, HttpTerminator} from 'http-terminator'
+
+import {Config} from './config.js'
+import {AppContext} from './context.js'
+import {default as routes, errorHandler} from './routes/index.js'
+
+export * from './config.js'
+export * from './logger.js'
+
+export class CardService {
+  public server?: http.Server
+  private terminator?: HttpTerminator
+
+  constructor(public app: express.Application, public ctx: AppContext) {}
+
+  static async create(cfg: Config): Promise<CardService> {
+    let app = express()
+
+    const ctx = await AppContext.fromConfig(cfg)
+    app = routes(ctx, app)
+    app.use(errorHandler)
+
+    return new CardService(app, ctx)
+  }
+
+  async start() {
+    this.server = this.app.listen(this.ctx.cfg.service.port)
+    this.server.keepAliveTimeout = 90000
+    this.terminator = createHttpTerminator({server: this.server})
+    await events.once(this.server, 'listening')
+  }
+
+  async destroy() {
+    this.ctx.abortController.abort()
+    await this.terminator?.terminate()
+  }
+}