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main.js
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main.js
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import LemmyBot from "lemmy-bot";
import chalk from "chalk";
import sqlite3 from "sqlite3";
import Parser from "rss-parser";
import { load } from "js-yaml";
import "dotenv/config";
import { readFileSync } from "fs";
let {
instances,
feeds,
markAsBot,
postCheckInterval,
dayCheckInterval,
timezone,
dayCutOff,
stopPosts,
showLogs,
postSleepDuration,
maxPosts,
parserOptions,
} = load(readFileSync("config.yaml", "utf8"));
markAsBot = markAsBot ?? true;
postCheckInterval = postCheckInterval ?? 10;
dayCheckInterval = dayCheckInterval ?? 10;
timezone = timezone ?? "America/Toronto";
dayCutOff = dayCutOff ?? 7;
stopPosts = stopPosts ?? false;
showLogs = showLogs ?? false;
postSleepDuration = postSleepDuration ?? 2000;
maxPosts = maxPosts ?? 5;
parserOptions = parserOptions ?? {};
let parser = new Parser({
customFields: {
item: ["image"],
},
...parserOptions
});
console.log(`${chalk.magenta("STARTED:")} Started Bot`);
log(
`${chalk.grey("INSTANCES:")} ${
Object.keys(instances).length
} instances loaded.`
);
log(`${chalk.grey("FEEDS:")} ${Object.keys(feeds).length} feeds loaded.`);
function log(message) {
if (showLogs) {
console.log(message);
}
}
// -----------------------------------------------------------------------------
// Databases
const db = new sqlite3.Database("mega.sqlite3", (err) => {
if (err) {
return console.error(err.message);
}
log(`${chalk.green("DB:")} Connected to the database.`);
db.run(
`CREATE TABLE IF NOT EXISTS posts (
id INTEGER PRIMARY KEY AUTOINCREMENT,
link TEXT NOT NULL UNIQUE,
pin_days INTEGER NOT NULL DEFAULT 0,
post_id TEXT,
featured INTEGER DEFAULT 0
)`,
(err) => {
if (err) {
return console.error(err.message);
}
log(`${chalk.grey("TABLE:")} Loaded posts table.`);
}
);
db.run(
`CREATE TABLE IF NOT EXISTS time (
key TEXT PRIMARY KEY,
value INTEGER
)`,
(err) => {
if (err) {
return console.error(err.message);
}
log(`${chalk.grey("TABLE:")} Loaded time table`);
db.run(
`INSERT OR IGNORE INTO time (key, value) VALUES ('day', 0)`,
(err) => {
if (err) {
return console.error(err.message);
}
}
);
}
);
// get all posts
db.all(`SELECT COUNT(*) as count FROM posts`, (err, rows) => {
if (err) {
return console.error(err.message);
}
log(`${chalk.grey("POSTS:")} ${rows[0].count} posts in database.`);
});
});
// -----------------------------------------------------------------------------
// Main Bot Code
function sleep(ms) {
return new Promise((resolve) => setTimeout(resolve, ms));
}
// Create the list of communities the bot will be interacting in
const allowList = [];
for (const [instance, communities] of Object.entries(instances)) {
allowList.push({
instance: instance,
communities: Object.keys(communities),
});
}
// Log in
const bot = new LemmyBot.LemmyBot({
instance: process.env.LEMMY_INSTANCE,
credentials: {
username: process.env.LEMMY_USERNAME,
password: process.env.LEMMY_PASSWORD,
},
dbFile: "db.sqlite3",
federation: {
allowList: allowList,
},
handlers: {
post: {
handle: async ({
postView: { post, creator },
botActions: { featurePost },
}) => {
// Pin post if its by the bot and set to be pinned
if (creator.name == process.env.LEMMY_USERNAME) {
// get link from db. If pin days > 0 then pin
db.all(
`SELECT * FROM posts WHERE link = ?`,
[post.url],
async (err, rows) => {
if (err) {
return console.error(err.message);
}
if (rows.length > 0) {
if (rows[0].featured) {
// Pin post
await featurePost({
postId: post.id,
featureType: "Community",
featured: true,
});
log(
`${chalk.green("PINNED:")} Pinned ${post.name} in ${
post.community_id
} by ${creator.name}`
);
// Update post in db
db.run(
`UPDATE posts SET post_id = ? WHERE link = ?`,
[post.id, post.url],
(err) => {
if (err) {
return console.error(err.message);
}
}
);
}
}
}
);
}
},
},
},
markAsBot: markAsBot,
schedule: [
{
cronExpression: `0 */${postCheckInterval} * * * *`,
timezone: timezone,
doTask: async ({ botActions: { getCommunityId, createPost } }) => {
log(`${chalk.cyan("STARTED:")} RSS Feed Fetcher.`);
for (const [name, feed] of Object.entries(feeds)) {
let rss;
try {
rss = await parser.parseURL(feed.url);
} catch (err) {
log(`SKIPPING: rss parse failed for ${name} with error ${err.message}`);
continue;
}
const cutoffDate = new Date();
cutoffDate.setDate(cutoffDate.getDate() - dayCutOff);
let joinedItems = [];
// gather all items from feeds to be joined
if (feed.joinfeeds) {
log(`${chalk.grey("FETCHING:")} joining feeds for ${name}`);
for (const joinFeedName of feed.joinfeeds) {
const joinFeed = Object.entries(feeds).find(
(f) => f[0] === joinFeedName
);
if (joinFeed) {
const joinRss = await parser.parseURL(joinFeed[1].url);
joinedItems = joinedItems.concat(joinRss.items);
}
}
}
let excludeItems = [];
// exclude feeds
if (feed.exclude) {
log(`${chalk.grey("FETCHING:")} exclusion feeds for ${name}`);
for (const excludeFeedName of feed.exclude) {
const excludeFeed = Object.entries(feeds).find(
(f) => f[0] === excludeFeedName
);
if (excludeFeed) {
const excludeRss = await parser.parseURL(excludeFeed[1].url);
for (const excludeItem of excludeRss.items) {
excludeItems.push(excludeItem.link);
}
}
}
}
let commonItems = rss.items.filter((item) => {
if (feed.joinfeeds && feed.exclude) {
return (
joinedItems.map((i) => i.link).includes(item.link) &&
!excludeItems.includes(item.link)
);
} else if (feed.joinfeeds) {
return joinedItems.map((i) => i.link).includes(item.link);
} else if (feed.exclude) {
return !excludeItems.includes(item.link);
} else {
return true;
}
});
let donePosts = 0;
for (const item of commonItems) {
let pin_days = 0;
const itemDate = new Date(
(feed.datefield ? item[feed.datefield] : item.pubDate).trim()
);
//if item is newer than cutoff continue
if (itemDate > cutoffDate) {
// if has categories then see if it's a pin
if (feed.pinCategories && item.categories) {
for (const category of item.categories) {
const found_category = feed.pinCategories.find(
(c) => c.name === category
);
if (found_category) {
pin_days = found_category.days;
}
}
}
db.run(
`INSERT INTO posts (link, pin_days, featured) VALUES (?, ?, ?)`,
[item.link, pin_days, pin_days > 0 ? 1 : 0],
async (err) => {
if (err) {
if (err.message.includes("UNIQUE constraint failed")) {
// do nothing
return;
} else {
return console.error(err.message);
}
}
log(
`${chalk.yellow("INSERTED:")} ${item.link} into database.`
);
if (stopPosts) return;
for (const [instance, communities] of Object.entries(
instances
)) {
for (const [community, value] of Object.entries(
communities
)) {
if (maxPosts != 0 && donePosts >= maxPosts) {
log(`${chalk.green("COMPLETE:")} Max posts reached.`);
return;
}
if (Object.values(value).includes(name)) {
log(
`${chalk.grey("CREATING:")} post for link ${
item.link
} in ${community}`
);
const communityId = await getCommunityId({
name: community,
instance: instance,
});
if (!communityId) {
console.error(`Could not find community ${community} on instance ${instance}`);
return;
}
let title = item.title;
title = parseTags(title);
let body =
feed.content && feed.content === "summary"
? item.summary
: item.content;
body = parseTags(body);
try {
donePosts++;
await createPost({
name: title,
body: body,
url: item.link || undefined,
community_id: communityId,
nsfw: feed.nsfw,
});
} catch (e) {
console.error(e);
}
await sleep(postSleepDuration);
}
}
}
}
);
}
}
log(`${chalk.green("COMPLETE:")} Feed ${name} processed.`);
}
},
},
{
cronExpression: `0 */${dayCheckInterval} * * * *`,
timezone: "America/Toronto",
doTask: async ({ botActions: { featurePost } }) => {
const now = addMinutes(new Date(), 30);
const day = now.getDay();
db.get(`SELECT value FROM time WHERE key = 'day'`, (err, row) => {
if (err) {
return console.error(err.message);
}
if (row.value !== day) {
db.run(
`UPDATE time SET value = ${day} WHERE key = 'day'`,
(err) => {
if (err) {
return console.error(err.message);
}
}
);
log(`${chalk.magenta("TIME:")} Updated day to ${day}`);
// decrement all post times by 1
db.run(
`UPDATE posts SET pin_days = pin_days - 1 WHERE featured = 1`,
(err) => {
if (err) {
return console.error(err.message);
}
log(`${chalk.magenta("TIME:")} Decremented all post times`);
// get all posts with 0 days left and unpin them
db.all(
`SELECT * FROM posts WHERE pin_days = 0 && featured = 1`,
async (err, rows) => {
if (err) {
return console.error(err.message);
}
for (const row of rows) {
await featurePost({
postId: row.post_id,
featureType: "Community",
featured: false,
});
log(
`${chalk.green("UNFEATURED:")} Unfeatured ${
row.post_id
}`
);
}
// set all posts with 0 days left to unfeatured
db.run(
`UPDATE posts SET featured = 0 WHERE pin_days = 0 AND featured = 1`,
(err) => {
if (err) {
return console.error(err.message);
}
log(
`${chalk.magenta(
"TIME:"
)} Unfeatured all posts with 0 days left`
);
}
);
}
);
}
);
}
});
},
},
],
});
let tags = {
"<em>": "**",
"</em>": "**",
"<p>": "",
"</p>": "",
"<strong>": "**",
"</strong>": "**",
"<br>": "\n",
"<br/>": "\n",
"<br />": "\n",
" ": " ",
"<ol>": "",
"</ol>": "",
"<li>": "- ",
"</li>": "",
"<ul>": "",
"</ul>": "\n",
" ": " ",
};
function parseTags(input) {
let output = input;
for (const [key, value] of Object.entries(tags)) {
output = output.replaceAll(key, value);
}
// Fix Links
const linkRegex = /<a href="([^"]+)">([^<]+)<\/a>/g;
let match;
match = linkRegex.exec(output);
while (match != null) {
output = output.replace(match[0], `[${match[2]}](${match[1]})`);
match = linkRegex.exec(output);
}
// Fix Links target black
const linkTargetRegex = /<a href="([^"]+)" target="_blank">([^<]+)<\/a>/g;
match = linkTargetRegex.exec(output);
while (match != null) {
output = output.replace(match[0], `[${match[2]}](${match[1]})`);
match = linkTargetRegex.exec(output);
}
// Fix font color
const fontRegex = /<font color="([^"]+)">([^<]+)<\/font>/g;
match = fontRegex.exec(output);
while (match != null) {
output = output.replace(match[0], match[2]);
match = fontRegex.exec(output);
}
return output;
}
bot.start();