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import { register } from "../actions/register";
import { FONT_FAMILY, VERTICAL_ALIGN } from "../constants";
import type { ExcalidrawProps } from "../types";
import { escapeDoubleQuotes, getFontString, updateActiveTool } from "../utils";
import { setCursorForShape } from "../cursor";
import { newTextElement } from "./newElement";
import { wrapText } from "./textWrapping";
import { isIframeElement } from "./typeChecks";
import type {
ExcalidrawElement,
ExcalidrawIframeLikeElement,
IframeData,
} from "./types";
import type { MarkRequired } from "../utility-types";
import { CaptureUpdateAction } from "../store";
type IframeDataWithSandbox = MarkRequired<IframeData, "sandbox">;
const embeddedLinkCache = new Map<string, IframeDataWithSandbox>();
const RE_YOUTUBE =
/^(?:http(?:s)?:\/\/)?(?:www\.)?youtu(?:be\.com|\.be)\/(embed\/|watch\?v=|shorts\/|playlist\?list=|embed\/videoseries\?list=)?([a-zA-Z0-9_-]+)(?:\?t=|&t=|\?start=|&start=)?([a-zA-Z0-9_-]+)?[^\s]*$/;
const RE_VIMEO =
/^(?:http(?:s)?:\/\/)?(?:(?:w){3}\.)?(?:player\.)?vimeo\.com\/(?:video\/)?([^?\s]+)(?:\?.*)?$/;
const RE_FIGMA = /^https:\/\/(?:www\.)?figma\.com/;
const RE_GH_GIST = /^https:\/\/gist\.github\.com\/([\w_-]+)\/([\w_-]+)/;
const RE_GH_GIST_EMBED =
/^<script[\s\S]*?\ssrc=["'](https:\/\/gist\.github\.com\/.*?)\.js["']/i;
// not anchored to start to allow <blockquote> twitter embeds
const RE_TWITTER =
/(?:https?:\/\/)?(?:(?:w){3}\.)?(?:twitter|x)\.com\/[^/]+\/status\/(\d+)/;
const RE_TWITTER_EMBED =
/^<blockquote[\s\S]*?\shref=["'](https?:\/\/(?:twitter|x)\.com\/[^"']*)/i;
const RE_VALTOWN =
/^https:\/\/(?:www\.)?val\.town\/(v|embed)\/[a-zA-Z_$][0-9a-zA-Z_$]+\.[a-zA-Z_$][0-9a-zA-Z_$]+/;
const RE_GENERIC_EMBED =
/^<(?:iframe|blockquote)[\s\S]*?\s(?:src|href)=["']([^"']*)["'][\s\S]*?>$/i;
const RE_GIPHY =
/giphy.com\/(?:clips|embed|gifs)\/[a-zA-Z0-9]*?-?([a-zA-Z0-9]+)(?:[^a-zA-Z0-9]|$)/;
const RE_REDDIT =
/^(?:http(?:s)?:\/\/)?(?:www\.)?reddit\.com\/r\/([a-zA-Z0-9_]+)\/comments\/([a-zA-Z0-9_]+)\/([a-zA-Z0-9_]+)\/?(?:\?[^#\s]*)?(?:#[^\s]*)?$/;
const RE_REDDIT_EMBED =
/^<blockquote[\s\S]*?\shref=["'](https?:\/\/(?:www\.)?reddit\.com\/[^"']*)/i;
const ALLOWED_DOMAINS = new Set([
"youtube.com",
"youtu.be",
"vimeo.com",
"player.vimeo.com",
"figma.com",
"link.excalidraw.com",
"gist.github.com",
"twitter.com",
"x.com",
"*.simplepdf.eu",
"stackblitz.com",
"val.town",
"giphy.com",
"reddit.com",
]);
const ALLOW_SAME_ORIGIN = new Set([
"youtube.com",
"youtu.be",
"vimeo.com",
"player.vimeo.com",
"figma.com",
"twitter.com",
"x.com",
"*.simplepdf.eu",
"stackblitz.com",
"reddit.com",
]);
export const createSrcDoc = (body: string) => {
return `<html><body>${body}</body></html>`;
};
export const getEmbedLink = (
link: string | null | undefined,
): IframeDataWithSandbox | null => {
if (!link) {
return null;
}
if (embeddedLinkCache.has(link)) {
return embeddedLinkCache.get(link)!;
}
const originalLink = link;
const allowSameOrigin = ALLOW_SAME_ORIGIN.has(
matchHostname(link, ALLOW_SAME_ORIGIN) || "",
);
let type: "video" | "generic" = "generic";
let aspectRatio = { w: 560, h: 840 };
const ytLink = link.match(RE_YOUTUBE);
if (ytLink?.[2]) {
const time = ytLink[3] ? `&start=${ytLink[3]}` : ``;
const isPortrait = link.includes("shorts");
type = "video";
switch (ytLink[1]) {
case "embed/":
case "watch?v=":
case "shorts/":
link = `https://www.youtube.com/embed/${ytLink[2]}?enablejsapi=1${time}`;
break;
case "playlist?list=":
case "embed/videoseries?list=":
link = `https://www.youtube.com/embed/videoseries?list=${ytLink[2]}&enablejsapi=1${time}`;
break;
default:
link = `https://www.youtube.com/embed/${ytLink[2]}?enablejsapi=1${time}`;
break;
}
aspectRatio = isPortrait ? { w: 315, h: 560 } : { w: 560, h: 315 };
embeddedLinkCache.set(originalLink, {
link,
intrinsicSize: aspectRatio,
type,
sandbox: { allowSameOrigin },
});
return {
link,
intrinsicSize: aspectRatio,
type,
sandbox: { allowSameOrigin },
};
}
const vimeoLink = link.match(RE_VIMEO);
if (vimeoLink?.[1]) {
const target = vimeoLink?.[1];
const error = !/^\d+$/.test(target)
? new URIError("Invalid embed link format")
: undefined;
type = "video";
link = `https://player.vimeo.com/video/${target}?api=1`;
aspectRatio = { w: 560, h: 315 };
//warning deliberately ommited so it is displayed only once per link
//same link next time will be served from cache
embeddedLinkCache.set(originalLink, {
link,
intrinsicSize: aspectRatio,
type,
sandbox: { allowSameOrigin },
});
return {
link,
intrinsicSize: aspectRatio,
type,
error,
sandbox: { allowSameOrigin },
};
}
const figmaLink = link.match(RE_FIGMA);
if (figmaLink) {
type = "generic";
link = `https://www.figma.com/embed?embed_host=share&url=${encodeURIComponent(
link,
)}`;
aspectRatio = { w: 550, h: 550 };
embeddedLinkCache.set(originalLink, {
link,
intrinsicSize: aspectRatio,
type,
sandbox: { allowSameOrigin },
});
return {
link,
intrinsicSize: aspectRatio,
type,
sandbox: { allowSameOrigin },
};
}
const valLink = link.match(RE_VALTOWN);
if (valLink) {
link =
valLink[1] === "embed" ? valLink[0] : valLink[0].replace("/v", "/embed");
embeddedLinkCache.set(originalLink, {
link,
intrinsicSize: aspectRatio,
type,
sandbox: { allowSameOrigin },
});
return {
link,
intrinsicSize: aspectRatio,
type,
sandbox: { allowSameOrigin },
};
}
if (RE_TWITTER.test(link)) {
const postId = link.match(RE_TWITTER)![1];
// the embed srcdoc still supports twitter.com domain only.
// Note that we don't attempt to parse the username as it can consist of
// non-latin1 characters, and the username in the url can be set to anything
// without affecting the embed.
const safeURL = escapeDoubleQuotes(
`https://twitter.com/x/status/${postId}`,
);
const ret: IframeDataWithSandbox = {
type: "document",
srcdoc: (theme: string) =>
createSrcDoc(
`<blockquote class="twitter-tweet" data-dnt="true" data-theme="${theme}"><a href="${safeURL}"></a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>`,
),
intrinsicSize: { w: 480, h: 480 },
sandbox: { allowSameOrigin },
};
embeddedLinkCache.set(originalLink, ret);
return ret;
}
if (RE_REDDIT.test(link)) {
const [, page, postId, title] = link.match(RE_REDDIT)!;
const safeURL = escapeDoubleQuotes(
`https://reddit.com/r/${page}/comments/${postId}/${title}`,
);
const ret: IframeDataWithSandbox = {
type: "document",
srcdoc: (theme: string) =>
createSrcDoc(
`<blockquote class="reddit-embed-bq" data-embed-theme="${theme}"><a href="${safeURL}"></a><br></blockquote><script async="" src="https://embed.reddit.com/widgets.js" charset="UTF-8"></script>`,
),
intrinsicSize: { w: 480, h: 480 },
sandbox: { allowSameOrigin },
};
embeddedLinkCache.set(originalLink, ret);
return ret;
}
if (RE_GH_GIST.test(link)) {
const [, user, gistId] = link.match(RE_GH_GIST)!;
const safeURL = escapeDoubleQuotes(
`https://gist.github.com/${user}/${gistId}`,
);
const ret: IframeDataWithSandbox = {
type: "document",
srcdoc: () =>
createSrcDoc(`
<script src="${safeURL}.js"></script>
<style type="text/css">
* { margin: 0px; }
table, .gist { height: 100%; }
.gist .gist-file { height: calc(100vh - 2px); padding: 0px; display: grid; grid-template-rows: 1fr auto; }
</style>
`),
intrinsicSize: { w: 550, h: 720 },
sandbox: { allowSameOrigin },
};
embeddedLinkCache.set(link, ret);
return ret;
}
embeddedLinkCache.set(link, {
link,
intrinsicSize: aspectRatio,
type,
sandbox: { allowSameOrigin },
});
return {
link,
intrinsicSize: aspectRatio,
type,
sandbox: { allowSameOrigin },
};
};
export const createPlaceholderEmbeddableLabel = (
element: ExcalidrawIframeLikeElement,
): ExcalidrawElement => {
let text: string;
if (isIframeElement(element)) {
text = "IFrame element";
} else {
text =
!element.link || element?.link === "" ? "Empty Web-Embed" : element.link;
}
const fontSize = Math.max(
Math.min(element.width / 2, element.width / text.length),
element.width / 30,
);
const fontFamily = FONT_FAMILY.Helvetica;
const fontString = getFontString({
fontSize,
fontFamily,
});
return newTextElement({
x: element.x + element.width / 2,
y: element.y + element.height / 2,
strokeColor:
element.strokeColor !== "transparent" ? element.strokeColor : "black",
backgroundColor: "transparent",
fontFamily,
fontSize,
text: wrapText(text, fontString, element.width - 20),
textAlign: "center",
verticalAlign: VERTICAL_ALIGN.MIDDLE,
angle: element.angle ?? 0,
});
};
export const actionSetEmbeddableAsActiveTool = register({
name: "setEmbeddableAsActiveTool",
trackEvent: { category: "toolbar" },
target: "Tool",
label: "toolBar.embeddable",
perform: (elements, appState, _, app) => {
const nextActiveTool = updateActiveTool(appState, {
type: "embeddable",
});
setCursorForShape(app.canvas, {
...appState,
activeTool: nextActiveTool,
});
return {
elements,
appState: {
...appState,
activeTool: updateActiveTool(appState, {
type: "embeddable",
}),
},
captureUpdate: CaptureUpdateAction.EVENTUALLY,
};
},
});
const matchHostname = (
url: string,
/** using a Set assumes it already contains normalized bare domains */
allowedHostnames: Set<string> | string,
): string | null => {
try {
const { hostname } = new URL(url);
const bareDomain = hostname.replace(/^www\./, "");
if (allowedHostnames instanceof Set) {
if (ALLOWED_DOMAINS.has(bareDomain)) {
return bareDomain;
}
const bareDomainWithFirstSubdomainWildcarded = bareDomain.replace(
/^([^.]+)/,
"*",
);
if (ALLOWED_DOMAINS.has(bareDomainWithFirstSubdomainWildcarded)) {
return bareDomainWithFirstSubdomainWildcarded;
}
return null;
}
const bareAllowedHostname = allowedHostnames.replace(/^www\./, "");
if (bareDomain === bareAllowedHostname) {
return bareAllowedHostname;
}
} catch (error) {
// ignore
}
return null;
};
export const maybeParseEmbedSrc = (str: string): string => {
const twitterMatch = str.match(RE_TWITTER_EMBED);
if (twitterMatch && twitterMatch.length === 2) {
return twitterMatch[1];
}
const redditMatch = str.match(RE_REDDIT_EMBED);
if (redditMatch && redditMatch.length === 2) {
return redditMatch[1];
}
const gistMatch = str.match(RE_GH_GIST_EMBED);
if (gistMatch && gistMatch.length === 2) {
return gistMatch[1];
}
if (RE_GIPHY.test(str)) {
return `https://giphy.com/embed/${RE_GIPHY.exec(str)![1]}`;
}
const match = str.match(RE_GENERIC_EMBED);
if (match && match.length === 2) {
return match[1];
}
return str;
};
export const embeddableURLValidator = (
url: string | null | undefined,
validateEmbeddable: ExcalidrawProps["validateEmbeddable"],
): boolean => {
if (!url) {
return false;
}
if (validateEmbeddable != null) {
if (typeof validateEmbeddable === "function") {
const ret = validateEmbeddable(url);
// if return value is undefined, leave validation to default
if (typeof ret === "boolean") {
return ret;
}
} else if (typeof validateEmbeddable === "boolean") {
return validateEmbeddable;
} else if (validateEmbeddable instanceof RegExp) {
return validateEmbeddable.test(url);
} else if (Array.isArray(validateEmbeddable)) {
for (const domain of validateEmbeddable) {
if (domain instanceof RegExp) {
if (url.match(domain)) {
return true;
}
} else if (matchHostname(url, domain)) {
return true;
}
}
return false;
}
}
return !!matchHostname(url, ALLOWED_DOMAINS);
};
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