From 1ef008ca90aa7e939188de4a7d38ea95fa823f71 Mon Sep 17 00:00:00 2001
From: OFF0 <offbyn@protonmail.com>
Date: Fri, 9 Dec 2022 13:52:59 +0100
Subject: [PATCH] feed: render link in text notes

Links should be rendered as anchors so that they are clickable.
For now only links starting with http:// https:// or www. are
supported.

Temporary disabled text notes shortening.
---
 src/domutil.js | 60 ++++++++++++++++++++++++++++++++++++++++----------
 src/main.js    | 21 +++++++++---------
 2 files changed, 59 insertions(+), 22 deletions(-)

diff --git a/src/domutil.js b/src/domutil.js
index 96c94fb..e364a9b 100644
--- a/src/domutil.js
+++ b/src/domutil.js
@@ -24,16 +24,52 @@ export function elem(name = 'div', {data, ...props} = {}, children = []) {
     return el;
 }
 
-/**
- * Renders line breaks
- *
- * @param {string} text with newlines
- * @return Array<TextNode | HTMLBRElement>
- */
-export function multilineText(string) {
-  return string
-    .trimRight()
-    .replaceAll(/\n{3,}/g, '\n\n')
-    .split('\n')
-    .reduce((acc, next, i) => acc.concat(i === 0 ? next : [elem('br'), next]), []);
+function isValidURL(url) {
+    if (!['http:', 'https:'].includes(url.protocol)) {
+        return false;
+    }
+    if (!['', '443', '80'].includes(url.port)) {
+        return false;
+    }
+    const lastDot = url.hostname.lastIndexOf('.');
+    if (lastDot < 1) {
+        return false;
+    }
+    if (url.hostname.slice(lastDot) === '.local') {
+        return false;
+    }
+    return true;
+}
+
+export function parseTextContent(string) {
+    return string
+        .trimRight()
+        .replaceAll(/\n{3,}/g, '\n\n')
+        .split('\n')
+        .map(line => {
+            const words = line.split(' ');
+            return words.map(word => {
+                if (!word.match(/(https?:\/\/|www\.)\S*/)) {
+                    return word;
+                }
+                try {
+                    if (!word.startsWith('http')) {
+                        word = 'https://' + word;
+                    }
+                    const url = new URL(word);
+                    if (!isValidURL(url)) {
+                        return word;
+                    }
+                    return elem('a', {
+                        href: url.href,
+                        target: '_blank',
+                        rel: 'noopener noreferrer'
+                    }, url.href.slice(url.protocol.length + 2));
+                } catch (err) {
+                    return word;
+                }
+            })
+            .reduce((acc, word) => [...acc, word, ' '], []);
+        })
+        .reduce((acc, words) => [...acc, ...words, elem('br')], []);
 }
diff --git a/src/main.js b/src/main.js
index 46e5c08..7a98a60 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,5 +1,5 @@
 import {relayPool, generatePrivateKey, getPublicKey, signEvent} from 'nostr-tools';
-import {elem, multilineText} from './domutil.js';
+import {elem, parseTextContent} from './domutil.js';
 import {dateTime, formatTime} from './timeutil.js';
 // curl -H 'accept: application/nostr+json' https://nostr.x1ddos.ch
 const pool = relayPool();
@@ -155,11 +155,12 @@ setInterval(() => {
 
 function createTextNote(evt, relay) {
   const {host, img, isReply, name, replies, time, userName} = getMetadata(evt, relay);
-  const isLongContent = evt.content.trimRight().length > 280;
-  const content = isLongContent ? evt.content.slice(0, 280) : evt.content;
+  // const isLongContent = evt.content.trimRight().length > 280;
+  // const content = isLongContent ? evt.content.slice(0, 280) : evt.content;
   const hasReactions = reactionMap[evt.id]?.length > 0;
   const didReact = hasReactions && !!reactionMap[evt.id].find(reaction => reaction.pubkey === pubkey);
   const replyFeed = replies[0] ? replies.map(e => replyDomMap[e.id] = createTextNote(e, relay)) : [];
+  const content = parseTextContent(evt.content);
   const body = elem('div', {className: 'mbox-body'}, [
     elem('header', {
       className: 'mbox-header',
@@ -173,7 +174,7 @@ function createTextNote(evt, relay) {
         elem('time', {dateTime: time.toISOString()}, formatTime(time)),
       ]),
     ]),
-    elem('div', {data: isLongContent ? {append: evt.content.slice(280)} : null}, multilineText(content)),
+    elem('div', {/* data: isLongContent ? {append: evt.content.slice(280)} : null*/}, content),
     elem('button', {
       className: 'btn-inline', name: 'star', type: 'button',
       data: {'eventId': evt.id, relay},
@@ -630,12 +631,12 @@ privateKeyInput.value = localStorage.getItem('private_key');
 pubKeyInput.value = localStorage.getItem('pub_key');
 
 document.body.addEventListener('click', (e) => {
-  const container = e.target.closest('[data-append]');
-  if (container) {
-    container.append(...multilineText(container.dataset.append));
-    delete container.dataset.append;
-    return;
-  }
+  // const container = e.target.closest('[data-append]');
+  // if (container) {
+  //   container.append(...parseTextContent(container.dataset.append));
+  //   delete container.dataset.append;
+  //   return;
+  // }
   const back = e.target.closest('[name="back"]')
   if (back) {
     hideNewMessage(true);