| 1 | import { useEffect } from "react"; |
| 2 | import { type ShouldRevalidateFunctionArgs, data } from "react-router"; |
| 3 | |
| 4 | |
| 5 | import type { Channel, ChannelMember, ChatMessage, User } from "@g1t/contracts"; |
| 6 | |
| 7 | import type { Route } from "./+types/channel"; |
| 8 | import { ChannelView } from "../../../components/chat/channel"; |
| 9 | import { conversationCache } from "../../../components/chat/conversation-cache"; |
| 10 | import { ChatUnavailable } from "../../../components/chat/empty"; |
| 11 | import { channelPath } from "../../../lib/chat"; |
| 12 | import { rememberChat } from "../../../lib/chat.server"; |
| 13 | import { page } from "../../../lib/meta"; |
| 14 | import { chat } from "../../../lib/services.server"; |
| 15 | import { requireUser, roleIn } from "../../../lib/session.server"; |
| 16 | |
| 17 | export function meta({ loaderData, params, ...args }: Route.MetaArgs) { |
| 18 | const title = loaderData && "title" in loaderData ? loaderData.title : "Chat"; |
| 19 | return page(args, { title: `${title} · ${params.owner} · g1t` }); |
| 20 | } |
| 21 | |
| 22 | export type ChannelData = |
| 23 | | { unavailable: true; title: string } |
| 24 | | { |
| 25 | unavailable: false; |
| 26 | title: string; |
| 27 | channel: Channel; |
| 28 | members: ChannelMember[]; |
| 29 | messages: ChatMessage[]; |
| 30 | older: string | null; |
| 31 | /** Whether the viewer is in it: a public channel can be read before joining. */ |
| 32 | joined: boolean; |
| 33 | /** Whether the viewer may rename, archive and unarchive it (the workspace's chat settings). */ |
| 34 | can_manage?: boolean; |
| 35 | }; |
| 36 | |
| 37 | /** |
| 38 | * One conversation: a channel by its name (`-/chat/general`) or a direct |
| 39 | * message by its id (`-/chat/dm/<id>`), with its latest messages. Live |
| 40 | * updates arrive over the socket once the page is open. |
| 41 | */ |
| 42 | export async function loader({ params, context, request }: Route.LoaderArgs) { |
| 43 | const viewer = requireUser(context, request); |
| 44 | if (!roleIn(viewer, params.owner)) throw data(null, { status: 404 }); |
| 45 | const slug = params.owner.toLowerCase(); |
| 46 | const name = "channel" in params ? (params.channel as string | undefined) : undefined; |
| 47 | const fallbackTitle = name ? `#${name}` : "Direct message"; |
| 48 | const read = await readConversation(slug, viewer, name, "id" in params ? (params.id as string | undefined) : undefined).catch( |
| 49 | (error: unknown) => { |
| 50 | console.error("chat: the conversation could not be read", error); |
| 51 | return "unavailable" as const; |
| 52 | }, |
| 53 | ); |
| 54 | if (read === "missing") throw data(null, { status: 404 }); |
| 55 | if (read === "unavailable") return { unavailable: true, title: fallbackTitle } satisfies ChannelData; |
| 56 | const secure = new URL(request.url).protocol === "https:"; |
| 57 | return data(read, { headers: { "Set-Cookie": rememberChat(channelPath(slug, read.channel), secure) } }); |
| 58 | } |
| 59 | |
| 60 | /** The conversation and its latest messages; "missing" for a 404, "unavailable" when chat does not answer. */ |
| 61 | async function readConversation( |
| 62 | slug: string, |
| 63 | viewer: User, |
| 64 | name: string | undefined, |
| 65 | byId: string | undefined, |
| 66 | ): Promise<Extract<ChannelData, { unavailable: false }> | "missing" | "unavailable"> { |
| 67 | // A channel's address is its name; a direct message's, its id. |
| 68 | const lookup = byId ? chat.channel(slug, byId, viewer) : name ? chat.channelByName(slug, name, viewer) : null; |
| 69 | if (!lookup) return "missing"; |
| 70 | const detail = await lookup; |
| 71 | if (!detail.ok) return detail.error.code === "not_found" || detail.error.code === "forbidden" ? "missing" : "unavailable"; |
| 72 | const history = await chat.messages(slug, detail.value.channel.id, viewer, { limit: 60 }); |
| 73 | const { channel, members } = detail.value; |
| 74 | // A public channel can be read before joining it. |
| 75 | const joined = members.some((m) => m.member.kind === "user" && m.member.id === viewer.id); |
| 76 | const others = members.filter((m) => !(m.member.kind === "user" && m.member.id === viewer.id)); |
| 77 | const title = |
| 78 | channel.kind === "channel" |
| 79 | ? `#${channel.name}` |
| 80 | : others.map((m) => m.member.display_name || m.member.name).join(", ") || "Direct message"; |
| 81 | return { |
| 82 | unavailable: false, |
| 83 | title, |
| 84 | channel, |
| 85 | members, |
| 86 | messages: history.ok ? history.value.messages : [], |
| 87 | older: history.ok ? history.value.older : null, |
| 88 | joined, |
| 89 | can_manage: detail.value.can_manage === true, |
| 90 | }; |
| 91 | } |
| 92 | |
| 93 | /** Opening a thread (`?thread=`) is the same page: nothing to load again. */ |
| 94 | export function shouldRevalidate({ currentUrl, nextUrl, formMethod, defaultShouldRevalidate }: ShouldRevalidateFunctionArgs) { |
| 95 | if (formMethod && formMethod !== "GET") return defaultShouldRevalidate; |
| 96 | if (currentUrl.pathname === nextUrl.pathname) return false; |
| 97 | return defaultShouldRevalidate; |
| 98 | } |
| 99 | |
| 100 | /** Conversations already seen in this tab (lib/chat-cache.ts), kept by the page as it changes. */ |
| 101 | const cache = conversationCache; |
| 102 | |
| 103 | /** |
| 104 | * Switching conversations: one seen before draws at once from the cache, |
| 105 | * and the server is asked again behind it; what it answers is merged in by |
| 106 | * id (components/chat/channel.tsx listens for `g1t:chat-fresh`). One not |
| 107 | * seen waits for the server, and is kept for next time. |
| 108 | */ |
| 109 | export async function clientLoader({ request, serverLoader }: Route.ClientLoaderArgs) { |
| 110 | const key = new URL(request.url).pathname; |
| 111 | const kept = cache.peek(key) ?? (await cache.load(key)); |
| 112 | const fresh = serverLoader().then((value) => { |
| 113 | if (!value.unavailable) { |
| 114 | cache.set(key, value); |
| 115 | window.dispatchEvent(new CustomEvent("g1t:chat-fresh", { detail: { key, value } })); |
| 116 | } |
| 117 | return value; |
| 118 | }); |
| 119 | if (kept && !kept.unavailable) { |
| 120 | fresh.catch(() => undefined); |
| 121 | return kept; |
| 122 | } |
| 123 | return fresh; |
| 124 | } |
| 125 | |
| 126 | export default function ChannelPage({ loaderData }: Route.ComponentProps) { |
| 127 | // What the server drew first is kept too, for coming back. |
| 128 | useEffect(() => { |
| 129 | if (!loaderData.unavailable) cache.set(window.location.pathname, loaderData); |
| 130 | }, [loaderData]); |
| 131 | if (loaderData.unavailable) return <ChatUnavailable title={loaderData.title} />; |
| 132 | return <ChannelView key={loaderData.channel.id} data={loaderData} />; |
| 133 | } |