Personal blog written from scratch using Node.js, Bootstrap, and MySQL. https://jrtechs.net
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/**
* Boated file which handles all the SQL
* queries ran by the server
*
* @author Jeffery Russell
*/
const mysql = require('mysql');
/** Sanitizer to clean user inputs and prevent SQL injections */
const sanitizer = require('sanitizer');
/** Crypto package used for hashing */
const crypto = require('crypto');
/** Used to parse post data */
const qs = require('querystring');
/** Used to load the config file from the disk */
const config = require('../utils/configLoader').getConfig();
/** SQL connection */
const con = mysql.createConnection({
host: config.SQL_HOST,
port: config.SQL_PORT,
user: config.SQL_USER,
password: config.SQL_PASSWORD,
database: config.SQL_DATABASE
});
con.connect(function(err) {
if (err)
console.log(err);
});
/**
* Function used to query the database for records
*
* @param sqlStatement
* @returns {Array}
*/
const fetch = function(sqlStatement)
{
return new Promise(function(resolve, reject)
{
con.query(sanitizer.sanitize(sqlStatement), function (err, result)
{
if(err)
{
console.log(err);
reject(err);
}
resolve(result);
});
});
};
/**
* 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
*/
const insert = function(sqlStatement)
{
return new Promise(function(resolve, reject)
{
con.query(sanitizer.sanitize(sqlStatement), function (err, result)
{
if (err)
{
console.log(err);
reject();
}
resolve(result.insertId);
});
})
};
/**
* Helper function to generate a hashed password
* from a given plain text password.
*
* This uses 64 bits of entropy as the random salt
* and uses sha256 hashing method to hash the password
* combined with the salt.
*
* @param password
* @returns {Object pass: hashedPassword, salt: salt used to hash}
*/
const createHashedPassword = function(password)
{
const randBuff = crypto.randomBytes(64);
const salt = crypto.createHash('sha256').update(randBuff).digest('hex');
const hashPass = crypto.createHash('sha256')
.update(password + salt)
.digest('hex');
var hashPassObject = new Object();
hashPassObject.pass = hashPass;
hashPassObject.salt = salt;
return hashPassObject;
};
/**
* Helper function which fetches the category url for all the
* posts returned in the posts table and appends them to the
* posts json objects.
*
* @param sqlPosts
* @returns {Promise}
*/
const fetchWithCategoryInformation = function(sqlPosts)
{
return new Promise(function(resolve, reject)
{
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.published = post.published;
obj.category = urls[0].url;
res(obj);
});
}));
});
Promise.all(promises).then(function(goodies)
{
resolve(goodies);
});
});
};
module.exports=
{
/**
* function which fetches the sql info on a post based on it's sql id
* @param id
* @returns {Array}
*/
getPostById: function(id)
{
return new Promise((resolve, reject)=>
{
fetch("select * from posts where post_id='" + id + "' limit 1")
.then(function(post)
{
if(post.length === 1)
{
resolve(post[0]);
}
else
{
reject();
}
}).catch((error)=>
{
reject(error);
});
});
},
insert: function(sqlStatement)
{
return insert(sqlStatement);
},
/**
* 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)
{
resolve(result_posts);
});
}
else
{
resolve(0);
}
});
});
},
/**
* Function used to retrieve all categories when making the sidebar
*
* @return {Promise<Response> | * | Array}
*/
getCategories : function()
{
const q = "SELECT * FROM categories ORDER BY name";
return fetch(q);
},
/**
* Function which currently returns all blog 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([]);
}
});
});
},
/**
* Fetches the recent posts from the database.
* @returns {Array}
*/
getRecentPostSQL: function()
{
return fetch("select * from posts order by post_id desc");
},
/**
* 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(limit)
{
limit = (limit == null) ? 10 : limit;
return new Promise(function(resolve, reject)
{
var q = "select name,url, published, category_id from posts order " +
"by post_id desc limit " + limit;
fetch(q).then(function(sqlPosts)
{
fetchWithCategoryInformation(sqlPosts).then(function(data)
{
resolve(data);
})
});
});
},
/**
* Returns a list of all the pinned posts in the database.
*
* @returns {Promise}
*/
getPinnedPosts: function()
{
return new Promise(function(resolve, reject)
{
var q = "select name,url, category_id from posts where pinned=1 order " +
"by post_id desc limit 10";
fetch(q).then(function(sqlPosts)
{
fetchWithCategoryInformation(sqlPosts).then(function(data)
{
resolve(data);
})
});
});
},
/**
* 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)
{
const post = qs.parse(postData);
return new Promise(function(resolve, reject)
{
var result = Object();
result.pass = false;
if(post.username && post.password)
{
const cleanName = sanitizer.sanitize(post.username);
const cleanPassword = sanitizer.sanitize(post.password);
const getSalt = "select * from users where user_name='" +
cleanName + "'";
fetch(getSalt).then(function(saltResult)
{
if(saltResult.length == 1)
{
const 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);
}
});
},
/**
* Fetches a promise containing every post in the database
* @returns {Array}
*/
getAllPosts: function()
{
return fetch("select * from posts order by published desc");
},
getAllUsers: function()
{
return fetch("select * from users");
},
getUserByID: function(userID)
{
const cleanID = sanitizer.sanitize(userID);
const q = "select * from users where user_id='" + cleanID + "'";
return fetch(q);
},
removeUser: function(user_id)
{
const cleanID = sanitizer.sanitize(user_id);
return insert("delete from users where user_id='" + cleanID + "'");
},
addUser: function(username, password)
{
const cleanName = sanitizer.sanitize(username);
const cleanPassword = sanitizer.sanitize(password);
const hashedPassword = createHashedPassword(cleanPassword);
const q = "insert into users(user_name, password, salt) values('" + cleanName + "'," +
"'" + hashedPassword.pass + "','" + hashedPassword.salt + "')";
return insert(q);
},
updateUser: function(userID, username, password)
{
const cleanID = sanitizer.sanitize(userID);
const cleanName = sanitizer.sanitize(username);
const cleanPassword = sanitizer.sanitize(password);
const hashedPassword = createHashedPassword(cleanPassword);
const q = "update users " +
"set user_name='" + cleanName + "'" +
",password='" + hashedPassword.pass + "'" +
",salt='" + hashedPassword.salt + "'" +
" where user_id='" + cleanID + "'";
return insert(q);
},
/**
* Fetches the sql category information based on it's id
* @param categoryId
* @returns {Array}
*/
getCategory: function(categoryId)
{
return fetch("select * from categories where category_id='"
+ categoryId + "'");
},
/**Returns download information associated with a download name
*
* @param downloadURL
* @returns {Array}
*/
getDownload: function(downloadURL)
{
var cleanD = sanitizer.sanitize(downloadURL);
var q = "select * from downloads where name='" + cleanD + "' limit 1";
return new Promise(function(resolve, reject)
{
fetch(q).then(function(sqlData)
{
return module.exports.incrementDownloadCount(sqlData);
}).then(function(sqlData)
{
resolve(sqlData)
}).catch(function(error)
{
reject(error);
})
});
},
/** Increments the download count in the database
*
* @param sqlRow
* @returns {*|Promise}
*/
incrementDownloadCount: function(sqlRow)
{
return new Promise(function(resolve, reject)
{
if(sqlRow.length == 1)
{
var q = "update downloads set download_count='" +
(sqlRow[0].download_count + 1) + "' where download_id='" +
sqlRow[0].download_id + "'";
console.log(q);
insert(q).then(function(r)
{
resolve(sqlRow);
}).catch(function(err)
{
reject(err);
})
}
else
{
resolve(sqlRow);
}
});
},
/**
* Fetches all the downloads from the database
*
* @returns {Array}
*/
getAllDownloads: function()
{
return fetch("select * from downloads");
},
/**
* Inserts a download row into the database
*
* @param name of the download
* @param file name of file
* @returns {*|the}
*/
addDownload: function(name, file)
{
const q = "insert into downloads (name, file, download_count) " +
"values('" + name + "', '" + file + "', '0')";
return insert(q);
},
/**
*
* @param id
*/
removeDownload: function(id)
{
const q = "delete from downloads where download_id='" + id + "'";
return insert(q);
},
/**
* Based on the post data submitted by the user this function updates
* the information on the post in the database
* @param postData
* @returns {*|the}
*/
editPost: function(postData)
{
const url = postData.edit_name_new.split(" ").join("-").toLowerCase();
console.log(postData);
var pinned = ("pinned_checkbox" in postData) == false ? "NULL": "1";
console.log(pinned);
const q = "update posts " +
"set category_id='" + postData.edit_cat_num + "' " +
",name='" + postData.edit_name_new + "' " +
",url='" + url + "' " +
",picture_url='" + postData.edit_pic + "' " +
",published='" + postData.edit_date + "' " +
",pinned=" + pinned+
" where post_id='" + postData.edit_post_2 + "'";
console.log(q);
return insert(q);
},
/**
* Function which returns a promise which contains the string of the
* entire sitemap for the blog.
* @returns {Promise|*}
*/
getSiteMap: function()
{
return new Promise(function(resolve, reject)
{
const base = "http://jrtechs.net/";
var sm = base + "\n";
var promises = [];
module.exports.getCategories().then(function(categories)
{
categories.forEach(function(cat)
{
promises.push(new Promise(function(res, rej)
{
sm += base + "category/" + cat.url + "\n";
module.exports.getPostsFromCategory(cat.url).then(function(posts)
{
posts.forEach(function(post)
{
sm += base + cat.url + "/" + post.url + "\n";
});
res()
})
}));
});
Promise.all(promises).then(function()
{
resolve(sm);
}).catch(function(error)
{
throw error;
});
});
});
},
/**
* Logs visited page for backend server analytics.
*
* @param ip
* @param page
*/
logTraffic: function(ip, page)
{
if(page.length > 40)
{
console.log("Error, request too long to log ip:"
+ ip + " page: " + page);
return;
}
if(ip.length > 20)
{
ip = "";
}
const q = "insert into traffic_log (url, ip, date) values " +
"('" + page + "', '" + ip + "', now())";
insert(q);
},
getTraffic: function()
{
return fetch("select * from traffic_log");
}
};