| Code with Finding: |
class SocialNetworkDatabasePosts {
/**
* Returns the list of posts within the Free For All board that the
* specified user can see.
*
* A User can see a post if they are:
* - the creator of the post (username == postedBy)
* - granted view privilege in PostsPrivileges
*
* Different from a regular board because you must check each post
* one by one to ensure that the user has the privilege for it.
*/
public static String getPostListFreeForAll(Connection conn, String username) {
String posts = "print Posts:;";
/*Retrieves all posts, joined with their most recent reply*/
Statement getPosts = null;
String getPostsFreeForAll = "SELECT pid, P.postedBy, P.datePosted, P.dateLastUpdated, MAX(R.dateReplied) " +
"FROM freeforall.posts AS P LEFT OUTER JOIN " +
"freeforall.replies as R USING (pid) " +
"GROUP BY pid ORDER BY P.dateLastUpdated DESC";
ResultSet postsResults = null;
/*Retrieves the privilege for a given post and user*/
PreparedStatement getPrivs = null;
String getPostPrivileges = "SELECT privilege " +
"FROM freeforall.postprivileges " +
"WHERE pid = ? AND username = ?";
ResultSet privsResult = null;
boolean sqlex = false;
try {
getPrivs = conn.prepareStatement(getPostPrivileges);
getPosts = conn.createStatement();
postsResults = getPosts.executeQuery(getPostsFreeForAll);
int pid;
String postedBy;
while (postsResults.next()) {
pid = postsResults.getInt("pid");
postedBy = postsResults.getString("P.postedBy");
if (!postedBy.equals(username)) {
getPrivs.setInt(1, pid);
getPrivs.setString(2, username);
privsResult = getPrivs.executeQuery();
/*Only expect one result set*/
if (privsResult.next()) { //user has view or viewpost priv
posts += "print \t" +
(privsResult.getString("privilege").equals("viewpost")? specialStrPostable : "") +
"Post#" + pid + "[" + postsResults.getString("P.postedBy") + "];";
if (postsResults.getTimestamp("MAX(R.dateReplied)") != null) {
posts += "print \t\t" +
"Most Recent Reply at " +
postsResults.getTimestamp("MAX(R.dateReplied)") + ";";
}
}
}
else { //the user is the creator of the post
posts += "print \t" + specialStrCreatedPost +
"Post#" + pid + "[" + postsResults.getString("P.postedBy") + "];";
if (postsResults.getTimestamp("MAX(R.dateReplied)") != null) {
posts += "print \t\t" +
"Most Recent Reply at " +
postsResults.getTimestamp("MAX(R.dateReplied)") + ";";
}
}
}
}
catch (SQLException e) {
e.printStackTrace();
sqlex = true;
}
finally {
DBManager.closeStatement(getPosts);
DBManager.closeResultSet(postsResults);
DBManager.closePreparedStatement(getPrivs);
DBManager.closeResultSet(privsResult);
}
if (posts.equals("print Posts:;") && !sqlex) {
return "print No posts for this board.";
}
else if (sqlex) {
return "print Error: Database Error while querying viewable posts. Contact an admin.";
}
else {
return posts;
}
}
}
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