[Chat] Add OpenGraph card for chat invite links (#10629)

bskyogcard/src/context.ts

@@ -3,6 +3,7 @@ import * as path from 'node:path'
 import {fileURLToPath} from 'node:url'
 
 import {AtpAgent} from '@atproto/api'
+import {type FontWeight} from 'satori'
 
 import {type Config} from './config.js'
 
@@ -11,13 +12,15 @@ const __DIRNAME = path.dirname(fileURLToPath(import.meta.url))
 export type AppContextOptions = {
   cfg: Config
   appviewAgent: AtpAgent
-  fonts: {name: string; data: Buffer}[]
+  chatAgent: AtpAgent
+  fonts: {name: string; data: Buffer; weight?: FontWeight}[]
 }
 
 export class AppContext {
   cfg: Config
   appviewAgent: AtpAgent
-  fonts: {name: string; data: Buffer}[]
+  chatAgent: AtpAgent
+  fonts: {name: string; data: Buffer; weight?: FontWeight}[]
   abortController = new AbortController()
 
   private opts: AppContextOptions
@@ -26,24 +29,46 @@ export class AppContext {
     this.opts = opts
     this.cfg = opts.cfg
     this.appviewAgent = opts.appviewAgent
+    this.chatAgent = opts.chatAgent
     this.fonts = opts.fonts
   }
 
   static async fromConfig(cfg: Config, overrides?: Partial<AppContextOptions>) {
     const appviewAgent = new AtpAgent({service: cfg.service.appviewUrl})
+    const chatAgent = new AtpAgent({service: cfg.service.chatUrl})
     const fontDirectory = path.join(__DIRNAME, 'assets', 'fonts')
     const fontFiles = readdirSync(fontDirectory)
     const fonts = fontFiles.map(file => {
       return {
-        name: path.basename(file, path.extname(file)),
+        name: getName(file),
         data: readFileSync(path.join(fontDirectory, file)),
+        weight: getWeight(file),
       }
     })
     return new AppContext({
       cfg,
       appviewAgent,
+      chatAgent,
       fonts,
       ...overrides,
     })
   }
 }
+
+function getName(file: string): string {
+  const base = path.basename(file, path.extname(file))
+  if (base.startsWith('Inter-')) return 'Inter'
+  return base
+}
+
+function getWeight(file: string): FontWeight {
+  switch (path.basename(file, path.extname(file))) {
+    case 'Inter-Regular':
+      return 400
+    case 'Inter-SemiBold':
+      return 600
+    case 'Inter-Bold':
+    default:
+      return 700
+  }
+}