refactor: inject masto instance via nuxt app (#134)

plugins/masto.ts

@@ -0,0 +1,27 @@
+import { login } from 'masto'
+import { currentUser } from '../composables/users'
+import { DEFAULT_SERVER } from '~/constants'
+
+export default defineNuxtPlugin(async () => {
+  try {
+    // TODO: improve upstream to make this synchronous (delayed auth)
+    const masto = await login({
+      url: `https://${currentUser.value?.server || DEFAULT_SERVER}`,
+      accessToken: currentUser.value?.token || undefined,
+    })
+
+    return {
+      provide: {
+        masto,
+      },
+    }
+  }
+  catch {
+    // TODO: handle error
+    // Show error page when Mastodon server is down
+    throw createError({
+      fatal: true,
+      statusMessage: 'Could not log into account.',
+    })
+  }
+})