protected void btnPost_Click(object sender, EventArgs e)
{
if (Session["userID"] != null)
{
// connect
using (DefaultConnection db = new DefaultConnection())
{
// create new post object in memory
post postObj = new post();
// get user id
Int32 userID = Convert.ToInt32(Session["userID"]);
String username = Session["username"].ToString();
// fill new post content
postObj.message = txtMessage.Text;
postObj.user_id = userID;
postObj.dislike_count = 0;
postObj.post_by = username;
// add post to database
db.posts.Add(postObj);
// save the new post
db.SaveChanges();
txtMessage.Text = "";
lblStatus.Text = "";
GetMessages();
}
} else
{
lblStatus.Text = "You must log in first to post";
}
}
protected void btnUpdate_Click(object sender, EventArgs e)
{
if (Session["userID"] != null)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
if (!String.IsNullOrEmpty(Request.QueryString["id"]))
{
//get the id from the url
Int32 postID = Convert.ToInt32(Request.QueryString["id"]);
// look up post
post postObj = (from p in db.posts
where p.id == postID
select p).FirstOrDefault();
postObj.message = txtNewMsg.Text;
//save updated post
db.SaveChanges();
// redirect to user profile page
Response.Redirect("profile.aspx");
}
}
}
else
{
Response.Redirect("default.aspx");
}
}
protected void GetMessages()
{
using (DefaultConnection db = new DefaultConnection())
{
grdMessages.DataSource = db.posts.ToArray();
grdMessages.DataBind();
}
}
protected void btnLogin_Click(object sender, EventArgs e)
{
//connect
using (DefaultConnection db = new DefaultConnection())
{
// create user obj
user userObj = new user();
// get username from input value
String username = txtUsername.Text;
userObj = (from u in db.users
where u.username == username
select u).FirstOrDefault();
// check if user exists
if (userObj != null)
{
String salt = userObj.salt;
// salt and hash the plain text password
String password = txtPassword.Text;
String pass_and_salt = password + salt;
// Create a new instance of the hash crypto service provider.
HashAlgorithm hashAlg = new SHA256CryptoServiceProvider();
// Convert the data to hash to an array of Bytes.
byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(pass_and_salt);
// Compute the Hash. This returns an array of Bytes.
byte[] bytHash = hashAlg.ComputeHash(bytValue);
// Optionally, represent the hash value as a base64-encoded string,
// For example, if you need to display the value or transmit it over a network.
string base64 = Convert.ToBase64String(bytHash);
if (userObj.password == base64)
{
//lblError.Text = "Valid Login";
//store the identity in the session object
Session["userID"] = userObj.id;
Session["username"] = userObj.username;
// redirect to departments page
Response.Redirect("default.aspx");
}
else
{
lblError.Text = "Invalid Login";
}
} else
{
lblError.Text = "Invalid Login";
}
}
}
protected void GetTheMsg()
{
using (DefaultConnection db = new DefaultConnection())
{
//get the id from the url
Int32 postID = Convert.ToInt32(Request.QueryString["id"]);
// look up post
post postObj = (from p in db.posts
where p.id == postID
select p).FirstOrDefault();
txtNewMsg.Text = postObj.message;
}
}
protected void GetUserMsg()
{
using (DefaultConnection db = new DefaultConnection())
{
Int32 userID = Convert.ToInt32(Session["userID"]);
// posts filtered for logged in user
var posts = from p in db.posts
where p.user_id == userID
select p;
// bind user posts to profile page gridview
grdUserMsg.DataSource = posts.ToArray();
grdUserMsg.DataBind();
}
}
protected void grdUserMsg_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
// identify post id
Int32 postID = Convert.ToInt32(grdUserMsg.DataKeys[e.RowIndex].Values["id"]);
// connect
using (DefaultConnection db = new DefaultConnection())
{
post postObj = (from p in db.posts
where p.id == postID
select p).FirstOrDefault();
// delete
db.posts.Remove(postObj);
db.SaveChanges();
//refresh grid
GetUserMsg();
}
}
protected void btnSignup_Click(object sender, EventArgs e)
{
// connect
using (DefaultConnection db = new DefaultConnection())
{
// create a new user
user userObj = new user();
// fill user name from sign up form input
userObj.username = txtUsername.Text;
// salt and hash the plain text password
String password = txtPassword.Text;
String salt = CreateSalt(8);
String pass_and_salt = password + salt;
// Create a new instance of the hash crypto service provider.
HashAlgorithm hashAlg = new SHA256CryptoServiceProvider();
// Convert the data to hash to an array of Bytes.
byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(pass_and_salt);
// Compute the Hash. This returns an array of Bytes.
byte[] bytHash = hashAlg.ComputeHash(bytValue);
// Optionally, represent the hash value as a base64-encoded string,
// For example, if you need to display the value or transmit it over a network.
string base64 = Convert.ToBase64String(bytHash);
userObj.password = base64;
userObj.salt = salt;
// save
db.users.Add(userObj);
db.SaveChanges();
// redirect
Response.Redirect("default.aspx");
}
}
protected void grdMessages_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "DislikeMsg")
{
Int32 index = Convert.ToInt32(e.CommandArgument);
Int32 postID = Convert.ToInt32(grdMessages.DataKeys[index].Values["id"]);
//connect
using (DefaultConnection db = new DefaultConnection())
{
post postObj = (from p in db.posts
where p.id == postID
select p).FirstOrDefault();
// increase dislike count
postObj.dislike_count++;
db.SaveChanges();
// refresh grid
GetMessages();
}
}
}
