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');
const 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}
*/
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);
});
});
};
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);
reject();
}
resolve(result.insertId);
});
})
},
/**
* function which fetches the sql info on a post based on it's sql id
* @param id
* @returns {Array}
*/
getPostById: function(id)
{
console.log("select * from posts where post_id='" + id + "' limit 1");
return new Promise(function(resolve, reject)
{
fetch("select * from posts where post_id='" + id + "' limit 1")
.then(function(post)
{
resolve(post[0]);
}).catch(function(error)
{
reject(error);
});
});
},
/**
* 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([]);
}
});
});
},
/**
* Fetches the recent posts from the database.
* @returns {Array}
*/
getRecentPostSQL: function()
{
return fetch("select * from posts order by post_id desc limit 10");
},
/**
* 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);
});
});
});
},
/**
* TODO
* @returns {*|Promise}
*/
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)
{
const 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);
}
});
},
/**
* Fetches a promise containing every post in the database
* @returns {Array}
*/
getAllPosts: function()
{
return fetch("select * from posts order by published desc");
},
/**
* 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);
module.exports.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)
{
var q = "insert into downloads (name, file, download_count) " +
"values('" + name + "', '" + file + "', '0')";
return module.exports.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)
{
var url = postData.edit_name_new.split(" ").join("-").toLowerCase();
var q = "update posts ";
q+= "set category_id='" + postData.edit_cat_num + "' ";
q+= ",name='" + postData.edit_name_new + "' ";
q+= ",url='" + url + "' ";
q+= ",picture_url='" + postData.edit_pic + "' ";
q+= ",published='" + postData.edit_date + "' ";
q+= " where post_id='" + postData.edit_post_2 + "'";
return module.exports.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)
{
var 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())";
module.exports.insert(q);
}
};