Personal blog written from scratch using Node.js, Bootstrap, and MySQL. https://jrtechs.net
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const mysql = require('mysql');
const sanitizer = require('sanitizer');
const Promise = require('promise');
const crypto = require('crypto');
const qs = require('querystring');
const utils = require('../utils/utils.js');
var con = mysql.createConnection({
host: "localhost",
user: "blog_user",
password: utils.getFileLine('../sql_secret'),
database: "jrtechs_blog"
});
con.connect(function(err) {
if (err) throw err;
});
/**
* Function used to query the database for records
*
* @param sqlStatement
* @returns {Array}
*/
var fetch = function(sqlStatement)
{
return new Promise(function(resolve, reject)
{
con.query(sqlStatement, function (err, result)
{
if(err)
{
reject();
}
resolve(result);
});
});
};
module.exports=
{
/**
* Function used to use insert statements into the database
*
* Don't worry, the input gets sanitized
*
* @param sqlStatement
* @return the id of the new record - if there is one
*/
insert : function(sqlStatement)
{
return new Promise(function(resolve, reject)
{
con.query(sanitizer.sanitize(sqlStatement), function (err, result)
{
if (err)
{
console.log(err);
resolve(0);
}
resolve(result.insertId);
});
})
},
/**
* Not to be mistaken for getPostData() in @file utils/utils.js,
* this function extracts a post entry from the sql server
*
* @param requestURL url user used to request blog post
* @return {*} the entry found in the data base -- if any
*/
getPost : function(requestURL)
{
return new Promise(function(resolve, reject)
{
var splitURL = requestURL.split("/")
var q = "select * from categories where url='" + splitURL[1] + "'";
fetch(q).then(function (result_category)
{
if(result_category.length != 0)
{
var q2 = "select * from posts where category_id='" +
result_category[0].category_id +
"' and url='" + splitURL[2] + "'";
fetch(q2).then(function (result_posts)
{
if(result_posts != 0)
{
resolve(result_posts[0]);
}
else
{
resolve(0);
}
});
}
else
{
resolve(0);
}
});
});
},
/**
* Function used to retrieve all categories when making the sidebar
*
* @return {Promise<Response> | * | Array}
*/
getCategories : function()
{
var q = "select * from categories";
return fetch(q);
},
/**
* Function which currently returns all posts of a particular
* category from the database
* @param requestURL
* @return {*|Promise}
*/
getPostsFromCategory: function(requestURL)
{
return new Promise(function(resolve, reject)
{
var q = "select * from categories where url ='" + requestURL + "'";
fetch(q).then(function(categories)
{
if(categories.length != 0)
{
var qPosts = "select * from posts where category_id='" +
categories[0].category_id + "' order by published desc";
resolve(fetch(qPosts));
}
else
{
resolve([]);
}
});
});
},
/**
* Helper method which returns a list of objects which contains the url
* and name of thee ten most recent posts
*
* {[name: , url: ],[name: , url: ],[name: , url: ],...}
*
* @return {*|Promise}
*/
getRecentPosts: function()
{
return new Promise(function(resolve, reject)
{
var q = "select name,url, category_id from posts order " +
"by post_id desc limit 10";
fetch(q).then(function(sqlPosts)
{
var promises = [];
sqlPosts.forEach(function(post)
{
promises.push(new Promise(function(res, rej)
{
var getCategory = "select url from categories where " +
"category_id='" + post.category_id + "'";
fetch(getCategory).then(function(urls)
{
var obj = new Object();
obj.name = post.name;
obj.url = post.url;
obj.category = urls[0].url;
res(obj);
});
}));
});
Promise.all(promises).then(function(goodies)
{
resolve(goodies);
});
});
});
},
getPopularPosts: function()
{
return new Promise(function(resolve, reject)
{
var q = "select * from popular_posts";
fetch(q).then(function(sqlPosts)
{
});
});
},
/**
* Function which checks to see if a user successfully logged in based on
* the post data which they sent
*
* @param postData the post data
* @return {*|Promise} a json object with {pass: , user: }
* the pass is whether or not they logged in successfully and the user is
* the username they successfully logged in with
*/
checkLogin: function(postData)
{
var post = qs.parse(postData);
return new Promise(function(resolve, reject)
{
var result = Object();
result.pass = false;
if(post.username && post.password)
{
var cleanName = sanitizer.sanitize(post.username);
var cleanPassword = sanitizer.sanitize(post.password);
var getSalt = "select * from users where user_name='" +
cleanName + "'";
fetch(getSalt).then(function(saltResult)
{
if(saltResult.length == 1)
{
var hashedPassword = crypto.createHash('sha256')
.update(cleanPassword + saltResult[0].salt)
.digest('hex');
if(saltResult[0].password === hashedPassword)
{
result.pass = true;
result.user = cleanName;
resolve(result);
}
else
{
resolve(result)
}
}
else
{
//incorrect username
resolve(result);
}
})
}
else
{
//no login attempts were made
resolve(result);
}
});
},
getCategory: function(categoryId)
{
return fetch("select * from categories where category_id='"
+ categoryId + "'");
},
getDownload: function(downloadURL)
{
var cleanD = sanitizer.sanitize(downloadURL);
var q = "select * from downloads where url='" + cleanD + "' limit 1";
return fetch(q);
},
getSiteMap: function()
{
return new Promise(function(resolve, reject)
{
});
}
};