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<script lang="ts">
import { parseContent, isImage, isVideo, isAudio } from "$lib/parseContent";
let {
content,
tags = [],
decryptMedia,
}: {
content: string;
tags?: any[];
decryptMedia?: (tag: string[]) => Promise<string>;
} = $props();
// Detect MIP-04 encrypted media (has "v mip04-v2" field)
let encryptedMedia = $derived(
tags.filter(
(t: string[]) =>
t[0] === "imeta" &&
t.some((v) => v === "v mip04-v2") &&
t.some((v) => v.startsWith("url ")),
),
);
// Plain (unencrypted) media from imeta tags
let plainMedia = $derived(
tags
.filter(
(t: string[]) =>
t[0] === "imeta" &&
!t.some((v) => v === "v mip04-v2") &&
t.some((v) => v.startsWith("url ")),
)
.map((t: string[]) => ({
url: t.find((v) => v.startsWith("url "))?.slice(4) || "",
mime: t.find((v) => v.startsWith("m "))?.slice(2) || "",
}))
.filter((m) => m.url),
);
// Set of all imeta URLs to suppress duplicate link rendering
let imetaUrls = $derived(
new Set([
...plainMedia.map((m) => m.url),
...encryptedMedia
.map((t: string[]) => t.find((v) => v.startsWith("url "))?.slice(4) || "")
.filter(Boolean),
]),
);
let parts = $derived(parseContent({ content, tags }));
const truncUrl = (url: string) => {
const short = url.replace(/^https?:\/\/(www\.)?/, "");
return short.length > 40 ? short.slice(0, 40) + "..." : short;
};
const resolveName = async (pubkey: string): Promise<string> => {
try {
const res = await fetch(`/api/users/${pubkey}`);
if (res.ok) {
const info = await res.json();
if (!info.anon && info.username) return `@${info.username}`;
}
} catch {}
return `@${pubkey.slice(0, 8)}...`;
};
const getMime = (tag: string[]): string =>
tag.find((v) => v.startsWith("m "))?.slice(2) || "image/jpeg";
</script>
{#each encryptedMedia as tag}
{#if decryptMedia}
{@const mime = getMime(tag)}
{#await decryptMedia(tag)}
<div class="chat-img-placeholder"></div>
{:then blobUrl}
{#if mime.startsWith("image/")}
<a href={blobUrl} target="_blank" rel="noopener noreferrer">
<img src={blobUrl} alt="" class="chat-img" />
</a>
{:else if mime.startsWith("video/")}
<!-- svelte-ignore a11y_media_has_caption -->
<video src={blobUrl} controls class="chat-video"></video>
{:else if mime.startsWith("audio/")}
<audio src={blobUrl} controls></audio>
{/if}
{:catch}
{@const url = tag.find((v) => v.startsWith("url "))?.slice(4) || ""}
<a href={url} target="_blank" rel="noopener noreferrer" class="chat-link">{truncUrl(url)}</a>
{/await}
{/if}
{/each}
{#each plainMedia as media}
{#if media.mime.startsWith("image/")}
<a href={media.url} target="_blank" rel="noopener noreferrer">
<img src={media.url} alt="" class="chat-img" />
</a>
{:else if media.mime.startsWith("video/")}
<!-- svelte-ignore a11y_media_has_caption -->
<video src={media.url} controls class="chat-video"></video>
{:else if media.mime.startsWith("audio/")}
<audio src={media.url} controls></audio>
{:else}
<a href={media.url} target="_blank" rel="noopener noreferrer" class="chat-link">{truncUrl(media.url)}</a>
{/if}
{/each}
{#each parts as { type, value }}
{#if type === "text"}
{value}
{:else if type === "newline"}
<br />
{:else if type === "link"}
{#if imetaUrls.has(value.url)}
<!-- Already rendered as imeta media above -->
{:else if isImage(value.url)}
<a href={value.url} target="_blank" rel="noopener noreferrer">
<img src={value.url} alt="" class="chat-img" />
</a>
{:else if isVideo(value.url)}
<!-- svelte-ignore a11y_media_has_caption -->
<video src={value.url} controls class="chat-video"></video>
{:else if isAudio(value.url)}
<audio src={value.url} controls>
<a href={value.url}>{truncUrl(value.url)}</a>
</audio>
{:else}
<a href={value.url} target="_blank" rel="noopener noreferrer" class="chat-link">{truncUrl(value.url)}</a>
{/if}
{:else if type === "topic"}
<a href={`/tag/${encodeURIComponent(value)}`} class="chat-topic">#{value}</a>
{:else if type.match(/^nostr:n(profile|pub)$/)}
{#await resolveName(value.pubkey)}
<a href={`/${value.pubkey}`} class="chat-mention">@{value.pubkey.slice(0, 8)}...</a>
{:then name}
<a href={`/${value.pubkey}`} class="chat-mention">{name}</a>
{/await}
{:else if type === "nostr:note"}
<a href={`/e/${value.id}`} class="chat-link">nostr:{value.entity?.slice(0, 16)}...</a>
{:else if type === "nostr:nevent"}
<a href={`/e/${value.id}`} class="chat-link">nostr:{value.entity?.slice(0, 16)}...</a>
{/if}
{/each}
<style>
.chat-img {
max-width: 100%;
border-radius: 8px;
margin: 4px 0;
}
.chat-img-placeholder {
width: 200px;
height: 150px;
border-radius: 8px;
margin: 4px 0;
background: var(--bg-secondary, #e5e7eb);
animation: pulse 1.5s ease-in-out infinite;
}
@keyframes pulse {
0%, 100% { opacity: 0.5; }
50% { opacity: 0.8; }
}
.chat-video {
max-width: 100%;
border-radius: 8px;
margin: 4px 0;
}
.chat-link {
text-decoration: underline;
word-break: break-all;
}
.chat-topic {
font-weight: bold;
color: var(--accent, #6366f1);
}
.chat-mention {
font-weight: bold;
color: var(--accent, #6366f1);
}
</style>
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