Fix premature closure of connections, add Tags util

src/util/nostr.ts

@@ -1,4 +1,5 @@
 import type {Event} from 'nostr-tools'
+import normalizeUrl from "normalize-url"
 import {verifySignature, getEventHash, matchFilter as nostrToolsMatchFilter} from 'nostr-tools'
 import {cached} from "./LRUCache"
 
@@ -7,38 +8,51 @@ import {cached} from "./LRUCache"
 
 export const now = () => Math.round(Date.now() / 1000)
 
+export const last = <T>(xs: T[]) => xs[xs.length - 1]
+
+export const identity = <T>(x: T) => x
+
 // ===========================================================================
 // Relays
 
 export const stripProto = (url: string) => url.replace(/.*:\/\//, "")
 
 export const isShareableRelay = (url: string) =>
-  // Is it actually a websocket url
-  url.match(/^wss:\/\/.+/) &&
-  // Sometimes bugs cause multiple relays to get concatenated
-  url.match(/:\/\//g)?.length === 1 &&
-  // It shouldn't have any whitespace
-  !url.match(/\s/) &&
-  // Don't match stuff with a port number
-  !url.slice(6).match(/:\d+/) &&
-  // Don't match raw ip addresses
-  !url.slice(6).match(/\d+\.\d+\.\d+\.\d+/) &&
-  // Skip nostr.wine's virtual relays
-  !url.slice(6).match(/\/npub/)
+  Boolean(
+    // Is it actually a websocket url and has a dot
+    url.match(/^wss?:\/\/.+\..+/) &&
+    // Sometimes bugs cause multiple relays to get concatenated
+    url.match(/:\/\//g)?.length === 1 &&
+    // It shouldn't have any whitespace
+    !url.match(/\s/) &&
+    // It shouldn't have any url-encoded whitespace
+    !url.match(/%/) &&
+    // Is it secure
+    url.match(/^wss:\/\/.+/) &&
+    // Don't match stuff with a port number
+    !url.slice(6).match(/:\d+/) &&
+    // Don't match raw ip addresses
+    !url.slice(6).match(/\d+\.\d+\.\d+\.\d+/) &&
+    // Skip nostr.wine's virtual relays
+    !url.slice(6).match(/\/npub/)
+  )
 
 export const normalizeRelayUrl = (url: string) => {
-  // If it doesn't start with a compatible protocol, strip the proto and add wss
-  if (!url.match(/^(wss|local):\/\/.+/)) {
-    url = "wss://" + stripProto(url)
+  // Use our library to normalize
+  url = normalizeUrl(url, {stripHash: true, stripAuthentication: false})
+
+  // Strip the protocol since only wss works
+  url = stripProto(url)
+
+  // Urls without pathnames are supposed to have a trailing slash
+  if (!url.includes("/")) {
+    url += "/"
   }
 
-  try {
-    return new URL(url).href.replace(/\/+$/, "").toLowerCase()
-  } catch (e) {
-    return null
-  }
+  return "wss://" + url
 }
 
+
 // ===========================================================================
 // Nostr URIs
 
@@ -49,7 +63,13 @@ export const toNostrURI = (s: string) => `nostr:${s}`
 // ===========================================================================
 // Events
 
-export const createEvent = (kind: number, {content = "", tags = [], created_at = now()}) =>
+export type CreateEventOpts = {
+  content?: string
+  tags?: string[][]
+  created_at?: number
+}
+
+export const createEvent = (kind: number, {content = "", tags = [], created_at = now()}: CreateEventOpts) =>
   ({kind, content, tags, created_at})
 
 export const hasValidSignature = cached({
@@ -66,6 +86,131 @@ export const hasValidSignature = cached({
   },
 })
 
+// ==========================================================================
+// Tags
+
+export class Fluent<T> {
+  xs: any[]
+
+  constructor(xs: T[]) {
+    this.xs = xs.filter(identity)
+  }
+
+  as = <U>(f: (xs: T[]) => U) => f(this.xs)
+
+  all = () => this.xs
+
+  count = () => this.xs.length
+
+  exists = () => this.xs.length > 0
+
+  first = () => this.xs[0]
+
+  nth = (i: number) => this.xs[i]
+
+  last = () => last(this.xs)
+
+  flat = () => new Fluent(this.xs.flatMap(identity))
+
+  uniq = () => new Fluent(Array.from(new Set(this.xs)))
+
+  drop = (n: number) => new Fluent(this.xs.map(t => t.slice(n)))
+
+  take = (n: number) => new Fluent(this.xs.map(t => t.slice(0, n)))
+
+  map = <U>(f: (t: T) => U) => new Fluent(this.xs.map(f))
+
+  pluck = (k: number | string) => new Fluent(this.xs.map(x => x[k]))
+
+  filter = (f: (t: T) => boolean) => new Fluent(this.xs.filter(f))
+
+  reject = (f: (t: T) => boolean) => new Fluent(this.xs.filter(t => !f(t)))
+
+  any = (f: (t: T) => boolean) => this.filter(f).exists()
+
+  find = (f: (t: T) => boolean) => this.xs.find(f)
+
+  has = (x: any) => this.xs.includes(x)
+}
+
+export class Tags extends Fluent<string[]> {
+  static from (e: Event | Event[]) {
+    const events = Array.isArray(e) ? e : [e]
+
+    return new Tags(events.flatMap(e => e.tags))
+  }
+
+  valueEquals = (v: string) => new Tags(this.xs.filter(t => t[1] === v))
+
+  values = (k?: string) => this.filter(t => !k || t[0] === k).pluck(1)
+
+  type(t: string | string[]) {
+    const types = Array.isArray(t) ? t : [t]
+
+    return new Tags(this.xs.filter(t => types.includes(t[0])))
+  }
+
+  mark(m: string | string[]) {
+    const marks = Array.isArray(m) ? m : [m]
+
+    return new Tags(this.xs.filter(t => marks.includes(last(t))))
+  }
+
+  relays = () => this.flat().filter(isShareableRelay).uniq()
+
+  topics = () => this.type("t").values().map((t: string) => t.replace(/^#/, ""))
+
+  pubkeys = () => this.type("p").values()
+
+  urls = () => this.type("r").values()
+
+  getValue = (k?: string) => this.values(k).first()
+
+  getDict() {
+    const meta: Record<string, string> = {}
+
+    for (const [k, v] of this.xs) {
+      if (!meta[k]) {
+        meta[k] = v
+      }
+    }
+
+    return meta
+  }
+
+  // Support the deprecated version where tags are not marked as replies
+  normalize() {
+    const tags = this.type(["a", "e"]).filter(t => last(t) !== "mention")
+    const legacy = tags.any(t => !["reply", "root"].includes(last(t)))
+
+    if (!legacy) {
+      return this
+    }
+
+    const reply = tags.last()
+    const root = tags.count() > 1 ? tags.first() : null
+    const newTags = tags.reject(t => [reply?.[1], root?.[1]].includes(t[1])).all()
+
+    if (reply) {
+      newTags.push(reply.slice(0, 3).concat("reply"))
+    }
+
+    if (root) {
+      newTags.push(root.slice(0, 3).concat("root"))
+    }
+
+    return new Tags(newTags)
+  }
+
+  getReply = () => {
+    const tags = this.normalize()
+
+    return tags.mark('reply').values().first() || tags.mark('root').values().first()
+  }
+
+  getRoot = () => this.normalize().mark('root').values().first()
+}
+
 // ===========================================================================
 // Filters