442 lines
12 KiB
PHP
442 lines
12 KiB
PHP
<?php
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class BlogpostComment
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{
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public $comment_id;
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public $blogpost_id;
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public $poster_id;
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public $poster_name;
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public $parent_id;
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public $timestamp;
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public $content;
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public $children;
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/**
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* Display the comment, and recursively it's children
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*/
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public function display_comment() {
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printf("
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<div class=\"comment\" id=\"comment-%s\">
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<div class=\"comment-own-wrapper\">
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<span class=\"comment-author\"> By: %s </span>
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<span class=\"comment-date\"> On: %s </span>
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<label for=\"reveal-response-%s\" class=\"checkbox-button\">
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Respond
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</label>
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<input type=\"checkbox\" id=\"reveal-response-%s\" style=\"display: none;\">
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<hr>
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<div class=\"comment-content\">
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%s
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</div>
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<div class=\"comment-response\">
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<form method=\"post\" action=\"%s\">
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<input type=\"hidden\" name=\"blogpost_id\" value=\"%s\">
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<input type=\"hidden\" name=\"comment_id\" value=\"%s\">
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<label for=\"comment_entry\">Write response:</label>
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<div class=\"centered-container\">
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<textarea name=\"comment_entry\" class=\"comment-box\"> </textarea>
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</div>
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<input name=\"submit\" type=\"submit\" value=\"Send\">
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</form>
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</div>
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</div>
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<div class=\"comment-child-wrapper\">
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",
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$this->comment_id,
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$this->poster_name,
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date("Y-m-d H:i", strtotime($this->timestamp)),
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$this->comment_id,
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$this->comment_id,
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$this->content,
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htmlspecialchars($_SERVER["PHP_SELF"]),
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$this->blogpost_id,
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$this->comment_id);
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if($this->children != null) {
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for($i = 0; $i < count($this->children); $i++)
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{
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$child = $this->children[$i];
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$child->display_comment();
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}
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}
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printf("</div></div>");
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}
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/**
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* Load the child comments to this comment, and recursively their children.
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*/
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public function load_children($conn) {
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// Prepare new statement for selecting all the child comments.
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$stmt = $conn->prepare("SELECT comment_id, poster_id, timestamp,
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content FROM blogpost_comments WHERE blogpost_id = :blogpost_id AND
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parent_id = :comment_id ORDER BY timestamp ASC;");
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// Bind and execute the comment select
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$stmt->bindParam(":blogpost_id", $this->blogpost_id);
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$stmt->bindParam(":comment_id", $this->comment_id);
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$stmt->execute();
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// Fetch the comments
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$results_arr = $stmt->fetchall(PDO::FETCH_ASSOC);
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$comments_arr = [];
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// Prepare comment author selection statement
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$stmt = $conn->prepare("SELECT username FROM users WHERE
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user_id = :user_id;");
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// Recursively fetch all the child comments
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for($i = 0; $i < count($results_arr); $i++) {
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$com = $results_arr[$i];
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// If comment has a registered author, fetch their name
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if($com["poster_id"]) {
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$stmt->bindParam(":user_id", $com["poster_id"]);
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$stmt->execute();
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$result = $stmt->fetch(PDO::FETCH_ASSOC);
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// If user was erased from database, set name to [Deleted]
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if(!$result) {
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$username = "[Deleted]";
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}
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else {
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$username = $result["username"];
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}
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}
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else {
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$username = "[Guest]";
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}
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$commentObj = new BlogpostComment($com["comment_id"],
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$com["poster_id"], $username, $this->blogpost_id,
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$com["timestamp"], $com["content"], $this->comment_id);
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$comments_arr[] = $commentObj;
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$commentObj->load_children($conn);
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}
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$this->children = $comments_arr;
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}
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/**
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* Constructor for the BlogpostComment object.
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* $comment_id GUID of the comment.
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* $poster_id GUID of the comment author.
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* $poster_name Name of the comment author.
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* $blogpost_id GUID of the blogpost this comment is under.
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* $timestamp Timestamp at comment creation.
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* $content Content of the comment.
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* $parent_id GUID of the comment this is a reply to (or NULL).
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*/
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public function __construct($comment_id, $poster_id, $poster_name,
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$blogpost_id, $timestamp, $content, $parent_id) {
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$this->comment_id = $comment_id;
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$this->blogpost_id = $blogpost_id;
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$this->poster_id = $poster_id;
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$this->poster_name = $poster_name;
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$this->timestamp = $timestamp;
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$this->content = $content;
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$this->parent_id = $parent_id;
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}
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}
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class Blogpost
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{
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public $blogpost_id;
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public $title;
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public $content;
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public $date_posted;
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public $tags;
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public $comments;
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/**
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* Display the article, or a warning message.
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*/
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public function display_article(){
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// If a blog with given ID was not found display warning message.
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if(!$this->title){
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printf("
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<article>
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<h2> Article not found </h2>
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<hr>
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<p>
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I am sorry, but I couldn't find an article with this ID.
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</p>
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</article>
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");
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return;
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}
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// Begin the article
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printf("<article>");
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// Display the blogpost name
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printf("<h2>%s</h2>", $this->title);
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// Display the blog metadata
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printf("<div class=\"blog-metadata\">");
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// Display tags
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for($i = 0; $i < count($this->tags); $i++) {
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$tag = $this->tags[$i];
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printf("
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<span class=\"blog-tag\" style=\"background-color: %s\">
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%s
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</span>", $tag["color"], $tag["name"]);
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}
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// Display publish date and end metadata div
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printf("<span class=\"blog-publish-date\">Published on: %s</span></div>",
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date("Y-m-d", strtotime($this->date_posted)));
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// Display hrule, article content and end the article
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printf("</article><hr><article>%s</article>", $this->content);
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}
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/**
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* Display the comments for this post and their children.
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*/
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public function display_comments(){
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printf("<article>");
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for($i = 0; $i < count($this->comments); $i++){
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$this->comments[$i]->display_comment();
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}
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printf("</article>");
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}
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/**
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* Constructor for the blogpost.
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* $blogpost_id GUID of the blogpost in the database.
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* $title Title of the blogpost.
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* $content Content of the blogpost article.
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* $date_posted Timestamp at publishing of article.
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* $tags Array of the tags this article has.
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* $comments Array of Blogpostcomment objects,
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* the comments of this article.
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*/
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public function __construct($blogpost_id, $title, $content,
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$date_posted, $tags, $comments){
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$this->blogpost_id = $blogpost_id;
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$this->title = $title;
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$this->content = $content;
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$this->date_posted = $date_posted;
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$this->tags = $tags;
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$this->comments = $comments;
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}
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}
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/**
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* Send a comment to the database.
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* If the poster is not signed in, send "NULL" (as a string) as the $posterID
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* The same goes for $parentId (that is the parent comment,
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* if this one is a response)
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* Returns: GUID PK of the newly added comment.
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*/
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function send_comment($conn, $blogId, $posterId, $content, $parentId) {
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// If content is empty, do not post
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if(empty($content)) {
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return "";
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}
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// Get a uuid for the comment
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$stmt = $conn->prepare("SELECT UUID()");
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$stmt->execute();
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$result = $stmt->fetch(PDO::FETCH_ASSOC);
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$uuid = $result["UUID()"];
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// Prepare the statemtnt
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$stmt = $conn->prepare("INSERT INTO blogpost_comments
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( comment_id, parent_id, blogpost_id, poster_id, content) VALUES
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(:comment_id, :parent_id, :blogpost_id, :poster_id, :content);");
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// Bind all the parameters
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$stmt->bindValue(":comment_id", $uuid, PDO::PARAM_STR);
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$stmt->bindValue(":parent_id", $parentId == "NULL"
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? NULL : $parentId, PDO::PARAM_STR);
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$stmt->bindValue(":blogpost_id", $blogId, PDO::PARAM_STR);
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$stmt->bindValue(":poster_id", $posterId == "NULL"
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? NULL : $posterId, PDO::PARAM_STR);
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$stmt->bindValue(":content", $content, PDO::PARAM_STR);
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// Execute the statement
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$stmt->execute();
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return $uuid;
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}
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/**
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* Load comments under a given blog.
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* Returns array of BlogpostComment objects.
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*/
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function load_comments($conn, $blogId) {
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// Prepare new statement for selecting all the child comments.
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$stmt = $conn->prepare("SELECT comment_id, poster_id, timestamp,
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content FROM blogpost_comments WHERE blogpost_id = :blogpost_id
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AND parent_id IS NULL ORDER BY timestamp ASC;");
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// Bind and execute the comment select
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$stmt->bindParam(":blogpost_id", $blogId);
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$stmt->execute();
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// Fetch the comments
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$results_arr = $stmt->fetchall(PDO::FETCH_ASSOC);
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$comments_arr = [];
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// Prepare comment author selection statement
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$stmt = $conn->prepare("SELECT username FROM users WHERE
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user_id = :user_id;");
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// Recursively fetch all the child comments
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for($i = 0; $i < count($results_arr); $i++) {
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$com = $results_arr[$i];
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// If comment has a registered author, fetch their name
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if($com["poster_id"]) {
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$stmt->bindParam(":user_id", $com["poster_id"]);
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$stmt->execute();
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$result = $stmt->fetch(PDO::FETCH_ASSOC);
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// If user was erased from database, set name to [Deleted]
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if(!$result) {
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$username = "[Deleted]";
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}
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else {
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$username = $result["username"];
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}
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}
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else {
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$username = "[Guest]";
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}
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$commentObj = new BlogpostComment($com["comment_id"], $com["poster_id"],
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$username, $blogId, $com["timestamp"], $com["content"], NULL);
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$commentObj->load_children($conn);
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$comments_arr[] = $commentObj;
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}
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return $comments_arr;
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}
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/**
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* Load info about the blog with a given guid and return corresponding
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* Blogpost object. NULL if blog couldn't be loaded.
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*/
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function load_blog($conn, $blogId){
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// Prepare and bind statement for gathering blogpost info
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$stmt = $conn->prepare("SELECT title, content, date_posted
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FROM blogposts WHERE blogpost_id = :blogpost_id;");
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$stmt->bindParam(":blogpost_id", $blogId);
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// Execute the statement
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$stmt->execute();
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// Fetch the blogpost
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$result = $stmt->fetch(PDO::FETCH_ASSOC);
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// If no post with given guid was found,
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// there is no information to gather, return.
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if(!$result){
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return null;
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}
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// Prepare new statement for selecting the tags for a given blogpost
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$stmt = $conn->prepare("SELECT name, color FROM
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blogpost_tags INNER JOIN blogpost_has_tag ON
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blogpost_tags.tag_id = blogpost_has_tag.tag_id WHERE
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blogpost_id = :blogpost_id;");
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// Bind and execute the tag select
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$stmt->bindParam(":blogpost_id", $blogId);
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$stmt->execute();
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// Fetch the tags
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$tags_arr = $stmt->fetchall(PDO::FETCH_ASSOC);
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// Set the variables
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$blogTitle = $result["title"];
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$blogContent = $result["content"];
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$datePosted = $result["date_posted"];
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$tags = $tags_arr;
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$comments = load_comments($conn, $blogId);
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return new Blogpost($blogId, $blogTitle, $blogContent,
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$datePosted, $tags, $comments);
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}
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// Check DB connection
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if($conn == null){
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include($_SERVER["DOCUMENT_ROOT"]."/errors/503.php");
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include($_SERVER["DOCUMENT_ROOT"]."/../common/footer.php");
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die();
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}
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// If the method is post (user submitted a comment), try to post it,
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// Refill the appropriate comment sumbmission form and display
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// error message on error.
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if(isset($_POST["submit"])) {
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// Sanitise the user-submitted data
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$blogId = sanitize_input($_POST["blogpost_id"]);
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$commentContent = sanitize_input($_POST["comment_entry"]);
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$parentId = isset($_POST["comment_id"]) ? $_POST["comment_id"] : "NULL";
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$posterId = isset($_SESSION["current_user"]) ? $_SESSION["current_user"]->user_id : "NULL";
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// Try to send the comment
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$commentId = send_comment($conn, $blogId, $posterId,
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$commentContent, $parentId);
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// Redirect to this page with GET
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header("Location: http://www.zdenekborovec-dev.cz/blog/article?guid=".
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$blogId."#comment-".$commentId);
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}
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// Get the blog id.
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$blogId = sanitize_input($_GET["guid"]);
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// If no ID was entered, display warning and die.
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if(!$blogId) {
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display_header("No article requested.");
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include($_SERVER["DOCUMENT_ROOT"]."/errors/404.php");
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include($_SERVER["DOCUMENT_ROOT"]."/../common/footer.php");
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die();
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}
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$blogPost = load_blog($conn, $blogId);
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// If no ID was entered, display warning and die.
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if(!$blogPost) {
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display_header("Article not found");
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include($_SERVER["DOCUMENT_ROOT"]."/errors/404.php");
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include($_SERVER["DOCUMENT_ROOT"]."/../common/footer.php");
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die();
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}
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// Display the header with title being the blog name
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display_header($blogPost->title);
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// Display the blog
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$blogPost->display_article();
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printf("<hr style=\"border-style: solid;\">");
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// Display post comment form.
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printf("
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<article>
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<h2> Comments: </h2>
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<form method=\"post\" action=\"%s\">
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<input type=\"hidden\" name=\"blogpost_id\" value=\"%s\">
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<label for=\"comment_entry\">Write a comment (%s):</label>
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<div class=\"centered-container\">
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<textarea name=\"comment_entry\" class=\"comment-box\" tabindex=\"1\"> </textarea>
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</div>
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<input name=\"submit\" type=\"submit\" tabindex=\"2\" value=\"Send\">
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</form>
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</article>
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",
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htmlspecialchars($_SERVER["PHP_SELF"]), $blogId,
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isset($_SESSION["current_user"]) ? $_SESSION["current_user"]->user_name :
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"Guest");
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// Display the blog comments
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$blogPost->display_comments();
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?>
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