mirror of
https://github.com/BlowaterNostr/blowater.git
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250 lines
7.4 KiB
TypeScript
250 lines
7.4 KiB
TypeScript
import * as csp from "https://raw.githubusercontent.com/BlowaterNostr/csp/master/csp.ts";
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import { Database_Contextual_View, NotFound, whoIamTalkingTo } from "../database.ts";
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import {
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DecryptionFailure,
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decryptNostrEvent,
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NostrAccountContext,
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NostrEvent,
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NostrKind,
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RelayResponse_Event,
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} from "../lib/nostr-ts/nostr.ts";
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import { ConnectionPool } from "../lib/nostr-ts/relay.ts";
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import { prepareNostrImageEvents, Tag } from "../nostr.ts";
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import { PublicKey } from "../lib/nostr-ts/key.ts";
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import { prepareEncryptedNostrEvent, prepareNormalNostrEvent } from "../lib/nostr-ts/event.ts";
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export async function sendDMandImages(args: {
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sender: NostrAccountContext;
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receiverPublicKey: PublicKey;
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message: string;
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files: Blob[];
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kind: NostrKind;
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lamport_timestamp: number;
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pool: ConnectionPool;
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waitAll: boolean;
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tags: Tag[];
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}) {
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const { tags, sender, receiverPublicKey, message, files, kind, lamport_timestamp, pool, waitAll } = args;
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console.log("sendDMandImages", message, files);
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const eventsToSend: NostrEvent[] = [];
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if (message.trim().length !== 0) {
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// build the nostr event
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const nostrEvent = await prepareEncryptedNostrEvent(
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sender,
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receiverPublicKey,
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kind,
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[
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["p", receiverPublicKey.hex],
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["lamport", String(lamport_timestamp)],
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...tags,
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],
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message,
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);
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console.log("sendDMandImages:", nostrEvent);
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if (nostrEvent instanceof Error) {
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return nostrEvent;
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}
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eventsToSend.push(nostrEvent);
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}
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for (let blob of files) {
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const imgEvent = await prepareNostrImageEvents(
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sender,
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receiverPublicKey,
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blob,
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kind,
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tags,
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);
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if (imgEvent instanceof Error) {
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return imgEvent;
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}
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let [fileEvents, _] = imgEvent;
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for (const event of fileEvents) {
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eventsToSend.push(event);
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}
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}
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// send the event
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const ps = [];
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for (const event of eventsToSend) {
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ps.push(pool.sendEvent(event));
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}
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return waitAll ? Promise.all(ps) : Promise.race(ps);
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}
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export async function sendSocialPost(args: {
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sender: NostrAccountContext;
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message: string;
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lamport_timestamp: number;
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pool: ConnectionPool;
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tags: Tag[];
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}) {
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const { sender, message, lamport_timestamp, pool, tags } = args;
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console.log("sendSocialPost", message);
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const event = await prepareNormalNostrEvent(sender, NostrKind.TEXT_NOTE, [
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["lamport", String(lamport_timestamp)],
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...tags,
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], message);
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return pool.sendEvent(event);
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}
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export function getAllEncryptedMessagesOf(
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publicKey: PublicKey,
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relay: ConnectionPool,
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) {
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const stream1 = getAllEncryptedMessagesSendBy(
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publicKey,
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relay,
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);
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const stream2 = getAllEncryptedMessagesReceivedBy(
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publicKey,
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relay,
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);
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return merge(stream1, stream2);
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}
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async function* getAllEncryptedMessagesSendBy(
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publicKey: PublicKey,
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relay: ConnectionPool,
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) {
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let resp = await relay.newSub(
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`getAllEncryptedMessagesSendBy`,
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{
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authors: [publicKey.hex],
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kinds: [4],
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},
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);
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if (resp instanceof Error) {
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throw resp;
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}
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for await (const nostrMessage of resp.chan) {
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yield nostrMessage;
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}
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}
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async function* getAllEncryptedMessagesReceivedBy(
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publicKey: PublicKey,
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relay: ConnectionPool,
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) {
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let resp = await relay.newSub(
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`getAllEncryptedMessagesReceivedBy`,
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{
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kinds: [4],
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"#p": [publicKey.hex],
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},
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);
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if (resp instanceof Error) {
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throw resp;
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}
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for await (const nostrMessage of resp.chan) {
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yield nostrMessage;
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}
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}
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async function decryptMessage(
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relayResponse: RelayResponse_Event,
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ctx: NostrAccountContext,
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publicKey: string,
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): Promise<NostrEvent | DecryptionFailure> {
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return decryptNostrEvent(relayResponse.event, ctx, publicKey);
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}
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function merge<T>(...iters: AsyncIterable<T>[]) {
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let merged = csp.chan<T>();
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async function coroutine<T>(
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source: AsyncIterable<T>,
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destination: csp.Channel<T>,
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) {
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for await (let ele of source) {
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if (destination.closed()) {
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return;
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}
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let err = await destination.put(ele);
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if (err instanceof csp.PutToClosedChannelError) {
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// this means the merged channel was not closed when
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// line 319 is called,
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// but during waiting time of line 319, no consumer pops it and it was closed.
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// This is normal semantics of channels
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// so that it's fine to not throw it up to the call stack
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// but then this ele has already been popped from the iter,
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// it will be lost.
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throw new Error("destination channel should not be closed");
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}
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}
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}
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for (let iter of iters) {
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coroutine(iter, merged);
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}
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return merged;
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}
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//////////////////
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// Read from DB //
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//////////////////
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// get the messages send by and received by pubkey
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export function getDirectMessageEventsOf(db: Database_Contextual_View, pubkey: PublicKey) {
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return db.filterEvents(filterDMof(pubkey));
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}
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export function getContactPubkeysOf(db: Database_Contextual_View, pubkey: PublicKey): Set<string> | Error {
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const msgs = getDirectMessageEventsOf(db, pubkey);
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const contactList = new Set<string>();
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for (const event of msgs) {
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const whoIAmTalkingTo = whoIamTalkingTo(event, pubkey);
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if (whoIAmTalkingTo instanceof Error) {
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return whoIAmTalkingTo;
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}
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contactList.add(whoIAmTalkingTo);
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}
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return contactList;
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}
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export function getNewestEventOf(
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db: Database_Contextual_View,
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pubkey: PublicKey,
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): NostrEvent | typeof NotFound {
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const events = Array.from(getDirectMessageEventsOf(db, pubkey));
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if (events.length === 0) {
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return NotFound;
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}
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let newest = events[0];
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for (let event of events.slice(1)) {
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if (event.created_at > newest.created_at) {
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newest = event;
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}
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}
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return newest;
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}
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export function get_Kind4_Events_Between(
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db: Database_Contextual_View,
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myPubKey: string,
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contactPubkey: string,
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) {
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const events = db.filterEvents(
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filterDMBetween(myPubKey, contactPubkey),
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);
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return events;
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}
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function filterDMof(pubkey: PublicKey) {
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return (e: NostrEvent) => {
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const isAuthor = e.pubkey === pubkey.hex;
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const isReceiver = e.tags.filter((t) => t[0] === "p" && t[1] === pubkey.hex).length === 1;
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const isDM = e.kind === NostrKind.DIRECT_MESSAGE;
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return isDM && (isAuthor || isReceiver);
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};
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}
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function filterDMBetween(myPubKey: string, contactPubKey: string) {
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return (e: NostrEvent) => {
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const isDM = e.kind === NostrKind.DIRECT_MESSAGE;
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const iAmAuthor = e.pubkey === myPubKey;
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const otherIsReceiver = e.tags.filter((t) => t[0] === "p" && t[1] === contactPubKey)
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.length > 0;
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const otherIsAuthor = e.pubkey === contactPubKey;
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const iAmReceiver = e.tags.filter((t) => t[0] === "p" && t[1] === myPubKey).length > 0;
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return isDM &&
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((iAmAuthor && otherIsReceiver) || (otherIsAuthor && iAmReceiver));
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};
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}
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