Warp/apps/web/src/components/RoomComposer.vue

<script setup lang="ts">
import type { Room } from 'matrix-js-sdk'
import { computed, nextTick, onBeforeUnmount, ref, watch } from 'vue'
import { WBanner, WComposer, WIcon, WIconButton, WSpinner } from '@warp/ui'
import { drafts } from '@/lib/drafts'
import { errorMessage, formatBytes } from '@/lib/format'
import { client, cryptoError } from '@/matrix/client'
import { sendFile, sendText } from '@/matrix/send'
import type { MessageItem } from '@/matrix/timeline'
import { useChat } from '@/stores/chat'
import { useToasts } from '@/stores/toasts'

// Writing to a room, or to one of its threads: the text field with its
// draft, typing notifications, uploads, and the message being replied to
// above it. The room view and the thread pane each have one.

const props = defineProps<{ room: Room; threadId?: string; placeholder: string }>()
const replyTo = defineModel<MessageItem | null>('replyTo', { default: null })

const chat = useChat()
const toasts = useToasts()
const me = client().getUserId() ?? ''
const composer = ref<InstanceType<typeof WComposer>>()

const encrypted = computed(() => {
  void chat.version
  return props.room.hasEncryptionStateEvent()
})
// An encrypted room can't be written to without the crypto stack.
const cryptoMissing = computed(() => encrypted.value && !chat.canEncrypt)
const canSend = computed(() => {
  void chat.version
  return props.room.currentState.maySendMessage(me)
})
/** Whether files dropped on the room can be sent. */
const canWrite = computed(() => canSend.value && !cryptoMissing.value)

const draftKey = computed(() => (props.threadId ? `${props.room.roomId}/${props.threadId}` : props.room.roomId))
const text = ref(drafts.get(draftKey.value) ?? '')
watch(text, (v) => (v ? drafts.set(draftKey.value, v) : drafts.delete(draftKey.value)))

// Typing notifications: on while there is text, renewed every few seconds,
// off when it's sent or cleared. Matrix has them per room, threads or not.
let typingUntil = 0
function setTyping(on: boolean) {
  const now = Date.now()
  if (on && now < typingUntil) return
  if (!on && typingUntil === 0) return
  typingUntil = on ? now + 4000 : 0
  client()
    .sendTyping(props.room.roomId, on, on ? 6000 : 0)
    .catch(() => undefined)
}
watch(text, (v) => setTyping(Boolean(v.trim())))
onBeforeUnmount(() => setTyping(false))

// Choosing a message to reply to puts the cursor in the field.
watch(replyTo, (v) => v && nextTick(() => composer.value?.focus()))

function target() {
  return { threadId: props.threadId, replyTo: replyTo.value?.eventId }
}

function send(body: string) {
  setTyping(false)
  const to = target()
  replyTo.value = null
  sendText(client(), props.room.roomId, body, to).catch((e) => {
    // A failed send stays in the timeline with Retry; say why once.
    toasts.error(errorMessage(e))
  })
}

// Uploads.
const uploads = ref<{ id: number; name: string; loaded: number; total: number }[]>([])
let uploadId = 0
let maxUpload: number | null | undefined

async function sendFiles(list: FileList | File[]) {
  // Copied first: the composer clears its file input (and so the live
  // FileList) as soon as it has handed the files over.
  const files = Array.from(list)
  if (!canWrite.value) return
  if (maxUpload === undefined) {
    maxUpload = await client()
      .getMediaConfig(true)
      .then((c) => c['m.upload.size'] ?? null)
      .catch(() => null)
  }
  const to = target()
  replyTo.value = null
  for (const file of files) {
    if (maxUpload && file.size > maxUpload) {
      toasts.error(`${file.name} is ${formatBytes(file.size)}; this homeserver takes files up to ${formatBytes(maxUpload)}.`)
      continue
    }
    const id = ++uploadId
    uploads.value.push({ id, name: file.name, loaded: 0, total: file.size })
    sendFile(
      client(),
      props.room,
      file,
      (p) => {
        const u = uploads.value.find((x) => x.id === id)
        if (u) Object.assign(u, { loaded: p.loaded, total: p.total })
      },
      to,
    )
      .catch((e) => toasts.error(`Can’t send ${file.name}: ${errorMessage(e)}`))
      .finally(() => (uploads.value = uploads.value.filter((x) => x.id !== id)))
  }
}

function onPaste(e: ClipboardEvent) {
  const files = e.clipboardData?.files
  if (files && files.length) {
    e.preventDefault()
    sendFiles(files)
  }
}

function onKey(e: KeyboardEvent) {
  if (e.key === 'Escape' && replyTo.value) {
    e.stopPropagation()
    replyTo.value = null
  }
}

defineExpose({ sendFiles, canWrite, focus: () => composer.value?.focus() })
</script>

<template>
  <div class="flex flex-col gap-2">
    <div v-for="u in uploads" :key="u.id" class="flex items-center gap-3 rounded-md bg-surface-raised px-3 py-2">
      <WSpinner :size="16" />
      <span class="small min-w-0 flex-1 truncate">Uploading {{ u.name }}</span>
      <span class="caption text-ink-muted tabular-nums">{{ u.total ? Math.round((u.loaded / u.total) * 100) : 0 }}%</span>
    </div>

    <WBanner v-if="cryptoMissing" tone="warning" title="End-to-end encryption didn’t start">
      This browser can’t read or send messages in this room. Reload the page to try again{{ cryptoError() ? ` (${cryptoError()})` : '' }}.
    </WBanner>
    <WBanner v-else-if="!canSend" tone="info">You don’t have permission to post in this room.</WBanner>
    <div v-else class="flex flex-col gap-1" @paste="onPaste" @keydown="onKey">
      <div v-if="replyTo" class="flex items-center gap-2 rounded-md border-l-2 border-teal-strong bg-surface-raised py-1 pr-1 pl-3">
        <WIcon name="reply" :size="16" class="shrink-0 text-ink-muted" />
        <p class="small m-0 min-w-0 flex-1 truncate">
          Replying to <span class="font-semibold">{{ replyTo.own ? 'yourself' : replyTo.senderName }}</span>
          <span class="text-ink-muted"> · {{ replyTo.media ? replyTo.media.filename : replyTo.body }}</span>
        </p>
        <WIconButton icon="close" label="Cancel reply" @click="replyTo = null" />
      </div>
      <WComposer ref="composer" v-model="text" :placeholder="placeholder" :encrypted="encrypted" @send="send" @attach="sendFiles" />
    </div>
  </div>
</template>