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util.ts
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util.ts
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import {
AppBskyEmbedExternal,
AppBskyEmbedImages,
AppBskyEmbedRecord,
AppBskyEmbedRecordWithMedia,
type BlobRef,
} from "@atproto/api";
import type { Bot } from "../../../bot/Bot.js";
import { ExternalEmbed } from "./ExternalEmbed.js";
import { ImagesEmbed } from "./ImagesEmbed.js";
import type { PostEmbed } from "./PostEmbed.js";
import { RecordEmbed } from "./RecordEmbed.js";
import { RecordWithMediaEmbed } from "./RecordWithMediaEmbed.js";
/**
* Options for constructing a PostEmbed from an embed view.
*/
export interface PostEmbedFromViewOptions {
/** The embed view. */
view:
| AppBskyEmbedImages.View
| AppBskyEmbedExternal.View
| AppBskyEmbedRecord.View
| AppBskyEmbedRecordWithMedia.View;
/** The embed record. */
record?:
| AppBskyEmbedImages.Main
| AppBskyEmbedExternal.Main
| AppBskyEmbedRecord.Main
| AppBskyEmbedRecordWithMedia.Main;
/** The active Bot instance (needed to create Post instance for RecordEmbed and RecordWithMediaEmbed). */
bot?: Bot;
}
/**
* Constructs the appropriate embed type from an embed view and record.
* @param options The options for constructing the embed.
*/
export function postEmbedFromView({ view, record, bot }: PostEmbedFromViewOptions): PostEmbed {
if (AppBskyEmbedImages.isView(view)) {
if (!record || !AppBskyEmbedImages.isMain(record)) {
throw new Error("Cannot construct ImagesEmbed from view without valid embed record");
}
return ImagesEmbed.fromView(view, record);
} else if (AppBskyEmbedExternal.isView(view)) {
return ExternalEmbed.fromView(view);
} else if (AppBskyEmbedRecord.isView(view)) {
if (!bot) throw new Error("Cannot construct RecordEmbed without bot instance");
return RecordEmbed.fromView(view, bot);
} else if (AppBskyEmbedRecordWithMedia.isView(view)) {
if (!record || !AppBskyEmbedRecordWithMedia.isMain(record)) {
throw new Error(
"Cannot construct RecordWithMediaEmbed from view without valid embed record",
);
}
if (!bot) throw new Error("Cannot construct RecordWithMediaEmbed without bot instance");
return RecordWithMediaEmbed.fromView(view, record, bot);
} else {
throw new Error("Invalid post embed view: " + JSON.stringify(view));
}
}
/**
* Determines if the provided value is an embed record.
* @param embed The embed to check.
*/
export function isEmbedMainRecord(
embed: unknown,
): embed is
| AppBskyEmbedImages.Main
| AppBskyEmbedExternal.Main
| AppBskyEmbedRecord.Main
| AppBskyEmbedRecordWithMedia.Main
{
return (AppBskyEmbedImages.isMain(embed)
|| AppBskyEmbedExternal.isMain(embed)
|| AppBskyEmbedRecord.isMain(embed)
|| AppBskyEmbedRecordWithMedia.isMain(embed));
}
/**
* Determines if the provided value is an embed view.
* @param view The view to check.
*/
export function isEmbedView(
view: unknown,
): view is
| AppBskyEmbedImages.View
| AppBskyEmbedExternal.View
| AppBskyEmbedRecord.View
| AppBskyEmbedRecordWithMedia.View
{
return (AppBskyEmbedImages.isView(view)
|| AppBskyEmbedExternal.isView(view)
|| AppBskyEmbedRecord.isView(view)
|| AppBskyEmbedRecordWithMedia.isView(view));
}
export async function fetchImageForBlob(
url: string,
): Promise<{ type: string; data: Uint8Array } | null> {
const res = await fetch(url);
if (!res || !res.ok) return null;
const blob = await res.blob();
if (!blob) return null;
const type = res.headers.get("content-type");
if (!type?.startsWith("image/")) return null;
return { type, data: new Uint8Array(await blob.arrayBuffer()) };
}
export async function fetchExternalEmbedData(
this: Bot,
url: string,
): Promise<AppBskyEmbedExternal.External | null> {
const res = await fetch(`https://cardyb.bsky.app/v1/extract?url=${encodeURIComponent(url)}`);
if (!res || !res.ok) return null;
const extractedEmbedData = await res.json();
if (!extractedEmbedData || typeof extractedEmbedData !== "object") return null;
if ("error" in extractedEmbedData && extractedEmbedData.error) return null;
if (
!("url" in extractedEmbedData) || typeof extractedEmbedData.url !== "string"
|| !("title" in extractedEmbedData) || typeof extractedEmbedData.title !== "string"
|| !("description" in extractedEmbedData)
|| typeof extractedEmbedData.description !== "string"
) return null;
const { title, description } = extractedEmbedData;
let thumb: BlobRef | undefined;
if ("image" in extractedEmbedData && typeof extractedEmbedData.image === "string") {
const { type, data: image } = await fetchImageForBlob(extractedEmbedData.image) ?? {};
if (image && type) {
const blob = await this.api.com.atproto.repo.uploadBlob(image, { encoding: type });
if (blob.success) {
thumb = blob.data.blob;
}
}
}
return { uri: url, title, description, ...(thumb ? { thumb } : {}) };
}