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import * as nip19 from "nostr-tools/nip19";
export const NEWLINE = "newline";
export const TEXT = "text";
export const TOPIC = "topic";
export const LINK = "link";
export const INVOICE = "invoice";
export const NOSTR_NOTE = "nostr:note";
export const NOSTR_NEVENT = "nostr:nevent";
export const NOSTR_NPUB = "nostr:npub";
export const NOSTR_NPROFILE = "nostr:nprofile";
export const NOSTR_NADDR = "nostr:naddr";
const first = (list: any) => (list ? list[0] : undefined);
export const fromNostrURI = (s: string) => s.replace(/^[\w+]+:\/?\/?/, "");
export const urlIsMedia = (url: string) =>
!url.match(/\.(apk|docx|xlsx|csv|dmg)/) && url.split("://").pop()?.includes("/");
export type ParsedPart = {
type: string;
value: any;
};
export const isImage = (url: string) => url?.match(/^.*\.(jpg|jpeg|png|webp|gif|avif|svg)/gi);
export const isVideo = (url: string) => url?.match(/^.*\.(mov|mkv|mp4|avi|m4v|webm)/gi);
export const isAudio = (url: string) => url?.match(/^.*\.(ogg|mp3|wav)/gi);
type ContentArgs = {
content: string;
tags?: Array<[string, string, string]>;
};
export const parseContent = ({ content, tags = [] }: ContentArgs): ParsedPart[] => {
const result: ParsedPart[] = [];
let text = content.trim();
let buffer = "";
const parseNewline = () => {
const newline = first(text.match(/^\n+/));
if (newline) {
return [NEWLINE, newline, newline];
}
};
const parseMention = () => {
const mentionMatch = text.match(/^#\[(\d+)\]/i);
if (mentionMatch) {
const i = parseInt(mentionMatch[1]);
if (tags[i]) {
const [tag, value, url] = tags[i];
const relays = url ? [url] : [];
let type, data, entity;
try {
if (tag === "p") {
type = "nprofile";
data = { pubkey: value, relays };
entity = nip19.nprofileEncode(data);
} else {
type = "nevent";
data = { id: value, relays, pubkey: null };
entity = nip19.neventEncode(data);
}
} catch {
/**/
}
return [`nostr:${type}`, mentionMatch[0], { ...data, entity }];
}
}
};
const parseTopic = () => {
const topic = first(text.match(/^#\w+/i));
if (topic && !topic.match(/^#\d+$/)) {
return [TOPIC, topic, topic.slice(1)];
}
};
const parseBech32 = () => {
const bech32 = first(
text.match(/^(web\+)?(nostr:)?\/?\/?n(event|ote|profile|pub|addr)1[\d\w]+/i),
);
if (bech32) {
try {
const entity = fromNostrURI(bech32);
const { type, data } = nip19.decode(entity) as {
type: string;
data: object;
};
let value = data;
if (type === "note") {
value = { id: data };
} else if (type === "npub") {
value = { pubkey: data };
}
return [`nostr:${type}`, bech32, { ...value, entity }];
} catch (e) {
console.log(e);
}
}
};
const parseUrl = () => {
const raw = first(text.match(/^([a-z+:]{2,30}:\/\/)?[^\s]+\.[a-z]{2,6}[^\s]*[^.!?,:\s]/gi));
if (raw) {
const prev = result[result.length - 1];
if (prev?.type === "text" && prev.value.endsWith("/")) {
return;
}
let url = raw;
if (url.match(/\.\./)) {
return;
}
if (!url.match("://")) {
url = "https://" + url;
}
return [LINK, raw, { url, isMedia: urlIsMedia(url) }];
}
};
while (text) {
const part =
parseNewline() ||
parseMention() ||
parseTopic() ||
parseBech32() ||
parseUrl();
if (part) {
if (buffer) {
result.push({ type: "text", value: buffer });
buffer = "";
}
const [type, raw, value] = part;
result.push({ type, value });
text = text.slice(raw.length);
} else {
const match = first(text.match(/^[\w\d]+ ?/i)) || text[0];
buffer += match;
text = text.slice(match.length);
}
}
if (buffer) {
result.push({ type: TEXT, value: buffer });
}
return result;
};
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