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app.js
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app.js
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// ----------------- INCLUDES -----------------
const snoowrap = require('snoowrap');
const parse = require('excel');
const mongoose = require('mongoose');
// ----------------- VARIABLES -----------------
var opinionValues = [];
// ----------------- CONFIG -----------------
if(!process.env.MONGODB_URI) {
const env = require('./env.js');
}
mongoose.Promise = global.Promise;
mongoose.connect(process.env.MONGODB_URI);
// ----------------- MAIN -----------------
// initialize all bots (will begin scanning for query)
var opinionBot = new Bot("in my opinion", {
clientId: process.env.OPINIONATEDBOT_REDDIT_ID,
clientSecret: process.env.OPINIONATEDBOT_REDDIT_SECRET,
username: process.env.OPINIONATEDBOT_REDDIT_USERNAME,
password: process.env.OPINIONATEDBOT_REDDIT_PASSWORD
});
// ----------------- CLASSES -----------------
function Bot(searchQuery, snoowrapParams) {
var self = this;
this.name = snoowrapParams.username;
this.r = new snoowrap({
userAgent: "bot",
clientId: snoowrapParams.clientId,
clientSecret: snoowrapParams.clientSecret,
username: snoowrapParams.username,
password: snoowrapParams.password
});
this.query = searchQuery;
this.maxRepliesPerThread = 1;
this.replySchema = new mongoose.Schema({
link_id: String,
comment_id: String
},
{
// capped databases have a max size and can listen for changes
capped: {size: 5242880, max: 500, autoIndexId: true}
});
this.Reply = mongoose.model(self.name + "-reply", self.replySchema);
this.wordArray;
this.scanInterval;
this.scanAndReply = function() {
self.r.getNewComments({limit: 500})
// self.r.getNewComments('test')
.then(comments => Promise.all(comments.map(self.checkCommentBody)))
.then(comments => Promise.all(comments.map(self.checkCommentAuthor)))
.then(comments => Promise.all(comments.map(self.checkReplied)))
.then(comments => Promise.all(comments.map(self.checkMaxReplies)))
.then(comments => self.removeNull(comments))
.then(comments => Promise.all(comments.map(self.reply)))
.then(comments => console.log(comments))
}
// check that comment author is not bot
this.checkCommentAuthor = function(comment) {
return new Promise(function(resolve) {
if (comment != null && comment.author.name != self.r.username) {
console.log("comment author is not bot");
resolve(comment);
} else {
resolve(null);
}
});
}
// check that this comment has not been replied to by bot already
this.checkReplied = function(comment) {
return new Promise(function(resolve) {
if (comment == null) {
resolve(null);
return;
}
self.Reply.find({ comment_id: comment.id }, function(err, replies) {
if (replies.length < 1) {
console.log("comment has not been replied to by bot");
resolve(comment);
} else {
resolve(null);
}
});
});
}
// check that thread has not been replied to more than x times
this.checkMaxReplies = function(comment) {
return new Promise(function(resolve) {
if (comment == null) {
resolve(null);
return;
}
self.Reply.find({ link_id: comment.link_id }, function(err, replies) {
if (replies.length < self.maxRepliesPerThread) {
console.log("thread has less than max replies by bot");
resolve(comment);
} else {
resolve(null);
}
});
});
}
// removes null comment entries
this.removeNull = function(comments) {
return new Promise(function(resolve) {
var validComments = [];
for (let i = 0; i < comments.length; i++) {
if (comments[i] != null) {
validComments.push(comments[i]);
}
}
resolve(validComments);
});
}
// check comment for matching query string
this.checkCommentBody = function(comment) {
return new Promise(function(resolve) {
// console.log("comment");
if (comment != null && comment.body && comment.body.toLowerCase().includes(self.query)) {
console.log("comment includes query");
resolve(comment);
} else {
resolve(null);
}
});
}
// reply to comment, and save thread id and comment id to DB
this.reply = function(comment) {
return new Promise(function(resolve) {
if (comment != null) {
var response = self.generateResponse();
comment.reply(response)
.catch(err => console.log(err.message))
.then(comment => self.addReplyToDB(comment))
.then(comment => resolve(comment))
} else {
resolve(null);
}
});
}
this.addReplyToDB = function(comment) {
return new Promise(function(resolve) {
if (comment != null) {
var newReply = {
link_id: comment.link_id,
comment_id: comment.id
}
// add reply to database
self.Reply.create(newReply, function(err, newReply) {
if (err) {
console.log(err);
}
resolve(comment);
});
} else {
resolve(null);
}
});
}
// generate a string response for replies
this.generateResponse = function() {
var words = [self.getRandWord(), self.getRandWord()];
// regenerate opinions if they're identical
while (words[0] === words[1]) {
words[1] = self.getRandWord();
}
var response = "Well, in MY opinion, " + words[0] + " is better than " + words[1] + ".";
return response;
}
// returns a single word from this bots word spreadsheet
this.getRandWord = function() {
var rand = Math.floor(Math.random() * self.wordArray.length);
return self.wordArray[rand];
}
this.init = function() {
// reads words from excel spreadsheet
parse('opinions.xlsx', function(err, data) {
if(err) throw err;
// data is an array of arrays
self.wordArray = flatten(data);
});
// begin scanning for matching posts every 60 seconds
self.scanInterval = setInterval(self.scanAndReply.bind(this), 60000);
}();
}
// ----------------- FUNCTIONS -----------------
function flatten(arr) {
return arr.reduce(function (flat, toFlatten) {
return flat.concat(Array.isArray(toFlatten) ? flatten(toFlatten) : toFlatten);
}, []);
}