mirror of
https://github.com/BlowaterNostr/blowater.git
synced 2024-10-18 07:33:22 +00:00
352 lines
11 KiB
TypeScript
352 lines
11 KiB
TypeScript
import { getTags, Parsed_Event, Profile_Nostr_Event } from "./nostr.ts";
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import * as csp from "https://raw.githubusercontent.com/BlowaterNostr/csp/master/csp.ts";
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import { parseJSON, ProfileData } from "./features/profile.ts";
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import { NostrEvent, NostrKind, Tag, verifyEvent } from "../libs/nostr.ts/nostr.ts";
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import { PublicKey } from "../libs/nostr.ts/key.ts";
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import { ProfileGetter, ProfileSetter } from "./UI/search.tsx";
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import { NoteID } from "../libs/nostr.ts/nip19.ts";
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const buffer_size = 2000;
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export interface Indices {
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readonly id: string;
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readonly create_at?: number;
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readonly kind?: NostrKind;
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readonly tags?: Tag[];
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readonly pubkey?: string;
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}
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export interface EventsFilter {
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filter(f?: (e: NostrEvent) => boolean): Promise<NostrEvent[]>;
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}
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export interface EventRemover {
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remove(id: string): Promise<void>;
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}
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export interface EventGetter {
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get(keys: Indices): Promise<NostrEvent | undefined> | NostrEvent | undefined;
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}
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export interface EventPutter {
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put(e: NostrEvent): Promise<void>;
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}
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export interface RelayRecordSetter {
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setRelayRecord: (eventID: string, url: string) => Promise<void>;
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}
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export interface AllRelayRecordGetter {
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getAllRelayRecords: () => Promise<Map<string, Set<string>>>;
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}
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export type EventMark = {
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event_id: string;
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reason: "removed";
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};
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export interface EventMarker {
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getMark(eventID: string): Promise<EventMark | undefined>;
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markEvent(eventID: string, reason: "removed"): Promise<void>;
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getAllMarks(): Promise<EventMark[]>;
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}
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export type RelayRecorder = RelayRecordSetter & AllRelayRecordGetter;
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export type EventsAdapter =
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& EventsFilter
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& EventGetter
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& EventPutter;
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export interface RelayRecordGetter {
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getRelayRecord: (eventID: string) => Set<string>;
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}
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export class Database_View implements ProfileSetter, ProfileGetter, EventRemover, RelayRecordGetter {
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private readonly sourceOfChange = csp.chan<{ event: Parsed_Event; relay?: string }>(buffer_size);
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private readonly caster = csp.multi<{ event: Parsed_Event; relay?: string }>(this.sourceOfChange);
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private readonly profiles = new Map<string, Profile_Nostr_Event>();
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private readonly deletionEvents = new Map</* event id */ string, /* deletion event */ Parsed_Event>();
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private constructor(
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private readonly eventsAdapter: EventsAdapter,
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private readonly relayRecorder: RelayRecorder,
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private readonly eventMarker: EventMarker,
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private readonly events: Map<string, Parsed_Event>,
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private readonly removedEvents: Set<string>,
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) {
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this.relay_record_loaded = new Promise(async (resolve) => {
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const all_records = await relayRecorder.getAllRelayRecords();
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for (const [event_id, relays] of all_records.entries()) {
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const set = this.relayRecords.get(event_id);
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if (set) {
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for (const relay of relays) {
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set.add(relay);
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}
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} else {
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this.relayRecords.set(event_id, relays);
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}
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}
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resolve(undefined);
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});
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}
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static async New(
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eventsAdapter: EventsAdapter,
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relayAdapter: RelayRecorder,
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eventMarker: EventMarker,
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) {
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const t = Date.now();
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const allEvents = await eventsAdapter.filter();
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console.log("Datebase_View:onload", Date.now() - t, allEvents.length);
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const initialEvents = new Map<string, Parsed_Event>();
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for (const e of allEvents) {
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const pubkey = PublicKey.FromHex(e.pubkey);
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if (pubkey instanceof Error) {
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console.error("impossible state");
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await eventMarker.markEvent(e.id, "removed");
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continue;
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}
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const p: Parsed_Event = {
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...e,
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parsedTags: getTags(e),
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publicKey: pubkey,
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};
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initialEvents.set(p.id, p);
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}
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console.log("Datebase_View:parsed", Date.now() - t);
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const all_removed_events = await eventMarker.getAllMarks();
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// Construct the View
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const db = new Database_View(
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eventsAdapter,
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relayAdapter,
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eventMarker,
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initialEvents,
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new Set(all_removed_events.map((mark) => mark.event_id)),
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);
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console.log("Datebase_View:New time spent", Date.now() - t);
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for (const event of db.events.values()) {
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if (event.kind == NostrKind.META_DATA) {
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// @ts-ignore
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const pEvent = parseProfileEvent(event);
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if (pEvent instanceof Error) {
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console.error(pEvent);
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continue;
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}
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db.setProfile(pEvent);
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} else if (event.kind == NostrKind.DELETE) {
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event.parsedTags.e.forEach((event_id) => {
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db.deletionEvents.set(event_id, event);
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});
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}
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}
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console.log(`Datebase_View:Deletion events size: ${db.deletionEvents.size}`);
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return db;
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}
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getEventByID = (id: string | NoteID) => {
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if (id instanceof NoteID) {
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id = id.hex;
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}
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if (this.removedEvents.has(id)) {
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return;
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}
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return this.events.get(id);
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};
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*getAllEvents() {
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for (const event of this.events.values()) {
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if (this.removedEvents.has(event.id)) {
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continue;
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}
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yield event;
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}
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}
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isDeleted(id: string, admin?: string) {
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const deletionEvent = this.deletionEvents.get(id);
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if (deletionEvent == undefined) {
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return false;
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}
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const targetEvent = this.getEventByID(id);
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if (targetEvent == undefined) {
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return false;
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}
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return deletionEvent.pubkey == targetEvent.publicKey.hex ||
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deletionEvent.pubkey == admin;
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}
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async remove(id: string): Promise<void> {
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this.removedEvents.add(id);
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await this.eventMarker.markEvent(id, "removed");
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}
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private relayRecords = new Map<string, Set<string>>();
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private relay_record_loaded: Promise<void>;
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getRelayRecord(eventID: string) {
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const relays = this.relayRecords.get(eventID);
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if (relays == undefined) {
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return new Set<string>();
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}
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return relays;
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}
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private async recordRelay(eventID: string, url: string) {
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await this.relayRecorder.setRelayRecord(eventID, url);
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const records = this.relayRecords.get(eventID);
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if (records) {
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const size = records.size;
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records.add(url);
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return records.size > size;
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} else {
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this.relayRecords.set(eventID, new Set([url]));
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return true;
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}
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}
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getProfilesByText = (name: string): Profile_Nostr_Event[] => {
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const result = [];
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for (const event of this.profiles.values()) {
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if (
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(event.profile.name &&
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event.profile.name?.toLocaleLowerCase().indexOf(name.toLowerCase()) != -1) ||
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(event.profile.display_name &&
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event.profile.display_name?.toLocaleLowerCase().indexOf(name.toLocaleLowerCase()) != -1)
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) {
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result.push(event);
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}
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}
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return result;
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};
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getProfileByPublicKey = (pubkey: PublicKey): Profile_Nostr_Event | undefined => {
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if (!this.profiles) return;
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const profile = this.profiles.get(pubkey.hex);
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return profile;
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};
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getUniqueProfileCount(): number {
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return this.profiles.size;
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}
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setProfile(profileEvent: Profile_Nostr_Event): void {
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const profile = this.profiles.get(profileEvent.pubkey);
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if (profile) {
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if (profileEvent.created_at > profile.created_at) {
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this.profiles.set(profileEvent.pubkey, profileEvent);
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}
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} else {
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this.profiles.set(profileEvent.pubkey, profileEvent);
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}
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}
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// If url is undefined, it's a locally created event that's not confirmed by relays yet.
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async addEvent(event: NostrEvent, url?: string | undefined) {
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const ok = await verifyEvent(event);
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if (!ok) {
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return ok;
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}
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const mark = await this.eventMarker.getMark(event.id);
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if (mark != undefined && mark.reason == "removed") {
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return false;
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}
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let new_relay_record = false;
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if (url) {
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new_relay_record = await this.recordRelay(event.id, url);
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}
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// parse the event to desired format
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const pubkey = PublicKey.FromHex(event.pubkey);
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if (pubkey instanceof Error) {
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console.error("impossible state");
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return pubkey;
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}
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const parsedEvent: Parsed_Event = {
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...event,
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parsedTags: getTags(event),
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publicKey: pubkey,
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};
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// check if the event exists
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{
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const storedEvent = this.getEventByID(event.id);
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if (storedEvent) { // event exist
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if (new_relay_record) {
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this.sourceOfChange.put({ event: parsedEvent, relay: url });
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}
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return false;
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}
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}
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// add event to database and notify subscribers
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console.log("Database.addEvent", event);
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this.events.set(parsedEvent.id, parsedEvent);
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if (parsedEvent.kind == NostrKind.META_DATA) {
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const pEvent = parseProfileEvent(parsedEvent as NostrEvent<NostrKind.META_DATA>);
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if (pEvent instanceof Error) {
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return pEvent;
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}
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this.setProfile(pEvent);
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} else if (parsedEvent.kind == NostrKind.DELETE) {
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parsedEvent.parsedTags.e.forEach((event_id) => {
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this.deletionEvents.set(event_id, parsedEvent);
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});
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}
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await this.eventsAdapter.put(event);
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/* not await */ this.sourceOfChange.put({ event: parsedEvent, relay: url });
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return parsedEvent;
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}
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//////////////////
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// On DB Change //
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//////////////////
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subscribe() {
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const c = this.caster.copy();
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const res = csp.chan<{ event: Parsed_Event; relay?: string }>(buffer_size);
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(async () => {
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for await (const newE of c) {
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const err = await res.put(newE);
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if (err instanceof csp.PutToClosedChannelError) {
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await c.close(
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"onChange listern has been closed, closing the source",
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);
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}
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}
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await res.close(
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"onChange source has been closed, closing the listener",
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);
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})();
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return res;
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}
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async waitRelayRecordToLoad(): Promise<void> {
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return this.relay_record_loaded;
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}
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}
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export function parseProfileEvent(
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event: NostrEvent<NostrKind.META_DATA>,
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): Profile_Nostr_Event | Error {
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const parsedTags = getTags(event);
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const publicKey = PublicKey.FromHex(event.pubkey);
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if (publicKey instanceof Error) return publicKey;
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const profileData = parseJSON<ProfileData>(event.content);
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if (profileData instanceof Error) {
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return profileData;
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}
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return {
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...event,
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kind: event.kind,
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profile: profileData,
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parsedTags,
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publicKey,
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};
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}
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