Personal blog written from scratch using Node.js, Bootstrap, and MySQL.
https://jrtechs.net
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531 lines
14 KiB
531 lines
14 KiB
/**
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* Boated file which handles all the SQL
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* queries ran by the server
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*
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* @author Jeffery Russell
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*/
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const mysql = require('mysql');
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/** Sanitizer to clean user inputs and prevent SQL injections */
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const sanitizer = require('sanitizer');
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/** Crypto package used for hashing */
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const crypto = require('crypto');
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/** Used to parse post data */
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const qs = require('querystring');
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/** Used to load the config file from the disk */
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const config = require('../utils/configLoader').getConfig();
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/** SQL connection */
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const con = mysql.createConnection({
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host: config.SQL_HOST,
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user: config.SQL_USER,
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password: config.SQL_PASSWORD,
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database: config.SQL_DATABASE
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});
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con.connect(function(err) {
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if (err)
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console.log(err);
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});
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/**
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* Function used to query the database for records
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*
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* @param sqlStatement
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* @returns {Array}
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*/
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const fetch = function(sqlStatement)
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{
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return new Promise(function(resolve, reject)
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{
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con.query(sanitizer.sanitize(sqlStatement), function (err, result)
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{
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if(err)
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{
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console.log(err);
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reject(err);
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}
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resolve(result);
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});
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});
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};
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module.exports=
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{
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/**
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* Function used to use insert statements into the database
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*
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* Don't worry, the input gets sanitized
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*
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* @param sqlStatement
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* @return the id of the new record - if there is one
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*/
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insert : function(sqlStatement)
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{
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return new Promise(function(resolve, reject)
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{
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con.query(sanitizer.sanitize(sqlStatement), function (err, result)
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{
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if (err)
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{
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console.log(err);
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reject();
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}
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resolve(result.insertId);
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});
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})
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},
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/**
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* function which fetches the sql info on a post based on it's sql id
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* @param id
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* @returns {Array}
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*/
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getPostById: function(id)
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{
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console.log("select * from posts where post_id='" + id + "' limit 1");
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return new Promise(function(resolve, reject)
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{
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fetch("select * from posts where post_id='" + id + "' limit 1")
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.then(function(post)
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{
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resolve(post[0]);
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}).catch(function(error)
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{
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reject(error);
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});
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});
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},
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/**
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* Not to be mistaken for getPostData() in @file utils/utils.js,
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* this function extracts a post entry from the sql server
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*
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* @param requestURL url user used to request blog post
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* @return {*} the entry found in the data base -- if any
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*/
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getPost : function(requestURL)
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{
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return new Promise(function(resolve, reject)
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{
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var splitURL = requestURL.split("/")
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var q = "select * from categories where url='" + splitURL[1] + "'";
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fetch(q).then(function (result_category)
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{
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if(result_category.length != 0)
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{
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var q2 = "select * from posts where category_id='" +
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result_category[0].category_id +
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"' and url='" + splitURL[2] + "'";
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fetch(q2).then(function (result_posts)
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{
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if(result_posts != 0)
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{
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resolve(result_posts[0]);
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}
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else
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{
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resolve(0);
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}
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});
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}
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else
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{
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resolve(0);
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}
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});
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});
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},
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/**
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* Function used to retrieve all categories when making the sidebar
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*
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* @return {Promise<Response> | * | Array}
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*/
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getCategories : function()
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{
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var q = "select * from categories";
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return fetch(q);
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},
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/**
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* Function which currently returns all posts of a particular
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* category from the database
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* @param requestURL
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* @return {*|Promise}
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*/
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getPostsFromCategory: function(requestURL)
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{
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return new Promise(function(resolve, reject)
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{
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var q = "select * from categories where url ='" + requestURL + "'";
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fetch(q).then(function(categories)
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{
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if(categories.length != 0)
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{
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var qPosts = "select * from posts where category_id='" +
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categories[0].category_id + "' order by published desc";
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resolve(fetch(qPosts));
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}
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else
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{
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resolve([]);
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}
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});
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});
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},
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/**
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* Fetches the recent posts from the database.
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* @returns {Array}
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*/
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getRecentPostSQL: function()
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{
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return fetch("select * from posts order by post_id desc limit 10");
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},
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/**
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* Helper method which returns a list of objects which contains the url
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* and name of thee ten most recent posts
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*
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* {[name: , url: ],[name: , url: ],[name: , url: ],...}
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*
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* @return {*|Promise}
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*/
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getRecentPosts: function()
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{
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return new Promise(function(resolve, reject)
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{
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var q = "select name,url, category_id from posts order " +
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"by post_id desc limit 10";
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fetch(q).then(function(sqlPosts)
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{
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var promises = [];
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sqlPosts.forEach(function(post)
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{
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promises.push(new Promise(function(res, rej)
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{
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var getCategory = "select url from categories where " +
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"category_id='" + post.category_id + "'";
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fetch(getCategory).then(function(urls)
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{
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var obj = new Object();
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obj.name = post.name;
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obj.url = post.url;
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obj.category = urls[0].url;
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res(obj);
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});
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}));
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});
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Promise.all(promises).then(function(goodies)
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{
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resolve(goodies);
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});
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});
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});
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},
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/**
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* TODO
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* @returns {*|Promise}
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*/
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getPopularPosts: function()
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{
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return new Promise(function(resolve, reject)
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{
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var q = "select * from popular_posts";
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fetch(q).then(function(sqlPosts)
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{
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});
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});
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},
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/**
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* Function which checks to see if a user successfully logged in based on
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* the post data which they sent
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*
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* @param postData the post data
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* @return {*|Promise} a json object with {pass: , user: }
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* the pass is whether or not they logged in successfully and the user is
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* the username they successfully logged in with
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*/
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checkLogin: function(postData)
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{
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const post = qs.parse(postData);
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return new Promise(function(resolve, reject)
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{
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var result = Object();
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result.pass = false;
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if(post.username && post.password)
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{
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const cleanName = sanitizer.sanitize(post.username);
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const cleanPassword = sanitizer.sanitize(post.password);
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const getSalt = "select * from users where user_name='" +
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cleanName + "'";
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fetch(getSalt).then(function(saltResult)
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{
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if(saltResult.length == 1)
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{
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const hashedPassword = crypto.createHash('sha256')
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.update(cleanPassword + saltResult[0].salt)
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.digest('hex');
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if(saltResult[0].password === hashedPassword)
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{
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result.pass = true;
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result.user = cleanName;
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resolve(result);
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}
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else
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{
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resolve(result)
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}
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}
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else
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{
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//incorrect username
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resolve(result);
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}
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})
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}
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else
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{
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//no login attempts were made
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resolve(result);
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}
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});
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},
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/**
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* Fetches a promise containing every post in the database
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* @returns {Array}
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*/
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getAllPosts: function()
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{
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return fetch("select * from posts order by published desc");
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},
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/**
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* Fetches the sql category information based on it's id
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* @param categoryId
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* @returns {Array}
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*/
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getCategory: function(categoryId)
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{
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return fetch("select * from categories where category_id='"
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+ categoryId + "'");
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},
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/**Returns download information associated with a download name
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*
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* @param downloadURL
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* @returns {Array}
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*/
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getDownload: function(downloadURL)
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{
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var cleanD = sanitizer.sanitize(downloadURL);
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var q = "select * from downloads where name='" + cleanD + "' limit 1";
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return new Promise(function(resolve, reject)
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{
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fetch(q).then(function(sqlData)
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{
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return module.exports.incrementDownloadCount(sqlData);
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}).then(function(sqlData)
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{
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resolve(sqlData)
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}).catch(function(error)
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{
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reject(error);
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})
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});
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},
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/** Increments the download count in the database
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*
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* @param sqlRow
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* @returns {*|Promise}
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*/
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incrementDownloadCount: function(sqlRow)
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{
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return new Promise(function(resolve, reject)
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{
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if(sqlRow.length == 1)
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{
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var q = "update downloads set download_count='" +
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(sqlRow[0].download_count + 1) + "' where download_id='" +
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sqlRow[0].download_id + "'";
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console.log(q);
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module.exports.insert(q).then(function(r)
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{
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resolve(sqlRow);
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}).catch(function(err)
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{
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reject(err);
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})
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}
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else
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{
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resolve(sqlRow);
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}
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});
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},
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/**
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* Fetches all the downloads from the database
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*
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* @returns {Array}
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*/
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getAllDownloads: function()
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{
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return fetch("select * from downloads");
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},
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/**
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* Inserts a download row into the database
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*
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* @param name of the download
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* @param file name of file
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* @returns {*|the}
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*/
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addDownload: function(name, file)
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{
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const q = "insert into downloads (name, file, download_count) " +
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"values('" + name + "', '" + file + "', '0')";
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return module.exports.insert(q);
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},
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/**
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*
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* @param id
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*/
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removeDownload: function(id)
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{
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const q = "delete from downloads where download_id='" + id + "'";
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return module.exports.insert(q);
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},
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/**
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* Based on the post data submitted by the user this function updates
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* the information on the post in the database
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* @param postData
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* @returns {*|the}
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*/
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editPost: function(postData)
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{
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const url = postData.edit_name_new.split(" ").join("-").toLowerCase();
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const q = "update posts " +
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"set category_id='" + postData.edit_cat_num + "' " +
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",name='" + postData.edit_name_new + "' " +
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",url='" + url + "' " +
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",picture_url='" + postData.edit_pic + "' " +
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",published='" + postData.edit_date + "' " +
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" where post_id='" + postData.edit_post_2 + "'";
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return module.exports.insert(q);
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},
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/**
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* Function which returns a promise which contains the string of the
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* entire sitemap for the blog.
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* @returns {Promise|*}
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*/
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getSiteMap: function()
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{
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return new Promise(function(resolve, reject)
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{
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const base = "http://jrtechs.net/";
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var sm = base + "\n";
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var promises = [];
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module.exports.getCategories().then(function(categories)
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{
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categories.forEach(function(cat)
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{
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promises.push(new Promise(function(res, rej)
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{
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sm += base + "category/" + cat.url + "\n";
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module.exports.getPostsFromCategory(cat.url).then(function(posts)
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{
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posts.forEach(function(post)
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{
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sm += base + cat.url + "/" + post.url + "\n";
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});
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res()
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})
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}));
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});
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Promise.all(promises).then(function()
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{
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resolve(sm);
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}).catch(function(error)
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{
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throw error;
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});
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});
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});
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},
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/**
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* Logs visited page for backend server analytics.
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*
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* @param ip
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* @param page
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*/
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logTraffic: function(ip, page)
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{
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if(page.length > 40)
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{
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console.log("Error, request too long to log ip:"
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+ ip + " page: " + page);
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return;
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}
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if(ip.length > 20)
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{
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ip = "";
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}
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const q = "insert into traffic_log (url, ip, date) values " +
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"('" + page + "', '" + ip + "', now())";
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module.exports.insert(q);
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}
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};
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