ComunicAPI/classes/components/conversations.php

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<?php
/**
* Conversations component
*
* @author Pierre HUBERT
*/
class conversations {
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/**
* @var String $conversationsListTable Name of the conversation list table
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*/
private $conversationsListTable;
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/**
* @var String $conversationsUsersTable Name of the conversation users table
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*/
private $conversationsUsersTable;
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/**
* @var String $conversationMessagesTabel Name of the conversation messages table
*/
private $conversationsMessagesTable;
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/**
* Public constructor
*/
public function __construct(){
$this->conversationsListTable = CS::get()->config->get("dbprefix")."conversations_list";
$this->conversationsUsersTable = CS::get()->config->get("dbprefix")."conversations_users";
$this->conversationsMessagesTable = CS::get()->config->get("dbprefix")."conversations_messages";
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}
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/**
* Get the conversations list of a specified user
* or get informations of a specific conversation
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*
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* @param int $userID The ID of the user to get the list
* @param int $conversationID Optionnal, the ID of conversation to get informatios from
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* @return Mixed Array in case of result / False else
*/
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public function getList(int $userID, int $conversationID = 0){
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//Prepare database request
$tablesName = $this->conversationsListTable.", ".$this->conversationsUsersTable;
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//Prepare conditions
$tableJoinCondition = $this->conversationsListTable.".ID = ".$this->conversationsUsersTable.".ID_".$this->conversationsListTable."";
$userCondition = $this->conversationsUsersTable.".ID_utilisateurs = ?";
$orderResults = "ORDER BY ".$this->conversationsListTable.".last_active DESC";
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//Specify conditions values
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$conditionsValues = array($userID);
//Check if we have to get informations about just one conversation
if($conversationID != 0){
$specificConditions = "AND ".$this->conversationsListTable.".ID = ?";
$conditionsValues[] = $conversationID;
}
else
$specificConditions = ""; //Nothing now
//Compile conditions
$conditions = "WHERE ".$tableJoinCondition." AND (".$userCondition.") ".$specificConditions." ".$orderResults;
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//Fields list
$requiredFields = array(
$this->conversationsListTable.".ID",
$this->conversationsListTable.".last_active",
$this->conversationsListTable.".name",
$this->conversationsListTable.".ID_utilisateurs AS ID_owner",
$this->conversationsUsersTable.".following",
$this->conversationsUsersTable.".saw_last_message",
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);
//Perform database request
$results = CS::get()->db->select($tablesName, $conditions, $conditionsValues, $requiredFields);
//Check for errors
if($results === false)
return false; //An error occurred
//Process results
$conversationsList = array();
foreach($results as $processConversation){
$conversationsList[] = array(
"ID" => $processConversation["ID"],
"ID_owner" => $processConversation["ID_owner"],
"last_active" => $processConversation["last_active"],
"name" => ($processConversation["name"] == "" ? false : $processConversation["name"]),
"following" => $processConversation["following"],
"saw_last_message" => $processConversation["saw_last_message"],
//Get and add conversation members
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"members" => $this->getConversationMembers($processConversation["ID"]),
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);
}
//Return results
return $conversationsList;
}
/**
* Get a conversation members
*
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* @param int $conversationID The ID of the conversation
* @return array A list of the conversation members (empty arary may means that an error occured)
*/
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public function getConversationMembers(int $conversationID) : array {
//Perform a request on the database
$tableName = $this->conversationsUsersTable;
$conditions = "WHERE ID_".$this->conversationsListTable." = ?";
$conditionsValues = array($conversationID*1);
$getFields = array("ID_utilisateurs as userID");
//Perform the request
$results = CS::get()->db->select($tableName, $conditions, $conditionsValues, $getFields);
if($results === false)
return array(); //An error occured
//Process results
$membersList = array();
foreach($results as $processUser)
$membersList[] = $processUser["userID"];
//Return result
return $membersList;
}
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/**
* Create a new conversation
*
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* @param int $userID The ID of the user creating the conversation
* @param bool $follow Defines if the user creating the conversation will follow it
* @param array $usersList The list of users following the conversation
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* @param Mixed $name Optionnal, the name of the conversation
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* @return int 0 for a fail else the ID of the newly created conversation
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*/
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public function create(int $userID, bool $follow, array $usersList, $name = "") : int{
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$mainInformations = array(
"ID_utilisateurs" => $userID*1,
"name" => ($name ? $name : ""),
"last_active" => time(),
"creation_time" => time()
);
//First, insert the conversation in the main table
if(!CS::get()->db->addLine($this->conversationsListTable, $mainInformations))
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return 0; //An error occured
//Get the last inserted ID
$conversationID = CS::get()->db->getLastInsertedID();
//Check for errors
if($conversationID == 0)
return 0;
//Insert users registrattions
foreach($usersList as $processUser){
//Make user follow the conversation if required
$processUserFollowing = false;
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if($userID == $processUser)
$processUserFollowing = $follow;
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//Try to insert user in conversation
if(!$this->addMember($conversationID, $processUser, $processUserFollowing))
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return 0; //Error
}
//Conversation creation is a success
return $conversationID;
}
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/**
* Check if a user is a member of a conversation or not
*
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* @param int $userID The ID of the user to check
* @param int $conversationID The ID of the conversation to check
* @return bool True if the user belongs to the conversation
*/
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public function userBelongsTo(int $userID, int $conversationID) : bool {
//Prepare a request on the database
$tableName = $this->conversationsUsersTable;
$conditions = "WHERE ID_".$this->conversationsListTable." = ? AND ID_utilisateurs = ?";
$values = array(
$conversationID,
$userID
);
//Peform a request on the database
$result = CS::get()->db->count($tableName, $conditions, $values);
//Check if request failed
if($result === false)
return false; // An error occured
//Analyse result and return it
return $result != 0;
}
/**
* Change the follow state of a user on conversation
*
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* @param int $userID The ID to update
* @param int $conversationID The ID of the conversation
* @param bool $follow Specify if the conversation is followed or not
* @return bool True for a success
*/
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public function changeFollowState(int $userID, int $conversationID, bool $follow) : bool{
//Prepare the request on the database
$tableName = $this->conversationsUsersTable;
$conditions = "ID_".$this->conversationsListTable." = ? AND ID_utilisateurs = ?";
$condVals = array(
$conversationID,
$userID
);
//Defines modifications
$modifs = array(
"following" => $follow ? 1 : 0,
);
//Update the table
if(!CS::get()->db->updateDB($tableName, $conditions, $modifs, $condVals))
return false; //An error occured
//Success
return true;
}
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/**
* Change conversation name
*
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* @param int $conversationID The ID of the conversation
* @param string $conversationName The name of the conversation
* @return bool True for a success
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*/
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public function changeName(int $conversationID, string $conversationName) : bool{
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//Prepare database request
$tableName = $this->conversationsListTable;
$conditions = "ID = ?";
$condVals = array($conversationID);
//Changes
$changes = array(
"name" => $conversationName,
);
//Try to perform request
if(!CS::get()->db->updateDB($tableName, $conditions, $changes, $condVals))
return false; //An error occured
//Success
return true;
}
/**
* Update conversation members list
*
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* @param int $conversationID The ID of the conversation to update
* @param array $conversationMembers The new list of conversation members
* @return bool True for a success
*/
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public function updateMembers(int $conversationID, array $conversationMembers) : bool{
//Get the current conversation list
$currentMembers = $this->getConversationMembers($conversationID);
//Determinate entries to add
$toAdd = array_diff($conversationMembers, $currentMembers);
//Determinate entries to remove
$toRemove = array_diff($currentMembers, $conversationMembers);
//Add new member
foreach($toAdd as $processInsert){
if(!$this->addMember($conversationID, $processInsert))
return false; //An error occured
}
//Remove old members
foreach($toRemove as $processDelete){
if(!$this->removeMember($conversationID, $processDelete))
return false; //An error occured
}
//Success
return true;
}
/**
* Add a member to the list
*
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* @param int $conversationID The ID of the target conversation
* @param int $userID The ID of the user to add to the conversation
* @param bool $follow Optionnal, specify if the user will follow or not the conversation
* @return bool True for a success
*/
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private function addMember(int $conversationID, int $userID, bool $follow = false) : bool {
//Prepare database request
$tableName = $this->conversationsUsersTable;
$values = array(
"ID_".$this->conversationsListTable => $conversationID,
"ID_utilisateurs" => $userID,
"time_add" => time(),
"following" => $follow ? 1 : 0,
"saw_last_message" => 1
);
//Try to perform request
return CS::get()->db->addLine($tableName, $values);
}
/**
* Remove a member from the list
*
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* @param int $conversationID The ID of the target conversation
* @param int $userID The ID of the user to remove from the conversation
* @return bool True for a success
*/
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private function removeMember(int $conversationID, int $userID) : bool {
//Prepare database request
$tableName = $this->conversationsUsersTable;
$conditions = "ID_".$this->conversationsListTable." = ? AND ID_utilisateurs = ?";
$values = array(
$conversationID,
$userID
);
//Try to perform request
return CS::get()->db->deleteEntry($tableName, $conditions, $values);
}
/**
* Check if a user is a conversation moderator or not
*
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* @param int $userID The ID of the user to check
* @param int $conversationID The ID of the conversation to check
* @return bool True if the user is a conversation moderator / false else
*/
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public function userIsModerator(int $userID, int $conversationID) : bool {
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//Prepare database request
$tableName = $this->conversationsListTable;
$conditions = "WHERE ID = ?";
$values = array($conversationID);
$requiredFields = array(
"ID_utilisateurs"
);
//Peform a request on the database
$results = CS::get()->db->select($tableName, $conditions, $values, $requiredFields);
//Check for errors
if($results === false)
return false; // An error occured
//Check if there was results
if(count($results) === 0)
return false;
//Check the first result only
return $results[0]["ID_utilisateurs"] == $userID;
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}
/**
* Search for a private conversation between two users
*
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* @param int $user1 The first user
* @param int $user2 The second user
* @return array The list of private conversations
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*/
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public function findPrivate(int $user1, int $user2) : array{
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//Prepare database request
$tableName = $this->conversationsUsersTable." AS table1 JOIN ".
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$this->conversationsUsersTable." AS table2 JOIN ".
$this->conversationsUsersTable." AS table3";
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//Prepare conditions
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$joinCondition = "(table1.ID_".$this->conversationsListTable." = table2.ID_".$this->conversationsListTable.")".
"AND (table1.ID_".$this->conversationsListTable." = table3.ID_".$this->conversationsListTable.")";
$whereConditions = "table1.ID_utilisateurs = ? AND table2.ID_utilisateurs = ?";
$groupCondition = "table1.ID_".$this->conversationsListTable." having count(*) = 2";
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//Conditions values
$condValues = array($user1, $user2);
//Required fields
$requiredFields = array(
"table1.ID_".$this->conversationsListTable." as conversationID",
);
//Build conditions
$conditions = "ON ".$joinCondition." WHERE ".$whereConditions." GROUP BY ".$groupCondition;
//Try to perform request
$results = CS::get()->db->select($tableName, $conditions, $condValues, $requiredFields);
//Check for errors
if($results === false)
return false;
//Prepare return
$conversationsID = array();
foreach($results as $processConversation)
$conversationsID[] = $processConversation["conversationID"];
//Return result
return $conversationsID;
}
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/**
* Insert a new message in the database
*
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* @param int $userID The ID of the user inserting the message
* @param int $conversationID The ID of the target conversation
* @param string $message The message to insert
* @param Mixed $image_path Optionnal, the path to an image associated with the message
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* @return bool True for a success
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*/
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private function insertMessage(int $userID, int $conversationID, string $message, $image_path = false) : bool{
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//Prepare values
$tableName = $this->conversationsMessagesTable;
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$values = array(
"ID_".$this->conversationsListTable => $conversationID,
"ID_utilisateurs" => $userID,
"time_insert" => time(),
"message" => $message
);
//Add image path (if required)
if($image_path)
$values['image_path'] = $image_path;
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//Try to insert new value in database
if(!CS::get()->db->addLine($tableName, $values))
return false; //An error occured
//Success
return true;
}
/**
* Update the last time a conversation was active
*
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* @param int $conversationID The ID of the conversation to update
* @param int $time The new time of last activity to set
* @return bool True for a success
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*/
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private function updateLastActive(int $conversationID, int $time) : bool{
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//Perform a request on the database
$tableName = $this->conversationsListTable;
$conditions = "ID = ?";
$condVals = array($conversationID);
//Set new values
$newValues = array(
"last_active" => $time,
);
//Try to perform a request on the database
if(!CS::get()->db->updateDB($tableName, $conditions, $newValues, $condVals))
return false; //An error occured
//Success
return true;
}
/**
* Mark all the users of a conversation as "unread"
*
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* @param int $conversationID The ID of the conversation to update
* @param array $exceptions Users that should not be marked as read
* @return bool True for a success
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*/
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private function allUsersAsUnread(int $conversationID, array $exceptions) : bool{
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//Prepare request
$tableName = $this->conversationsUsersTable;
$conditions = "ID_".$this->conversationsListTable." = ?";
$condVals = array($conversationID);
//Remove users exceptions
foreach($exceptions as $userID){
$conditions.= " AND ID_utilisateurs != ?";
$condVals[] = $userID;
}
//Define new values
$newValues = array(
"saw_last_message" => 0
);
//Try to perform a request on the database
if(!CS::get()->db->updateDB($tableName, $conditions, $newValues, $condVals))
return false; //An error occured
//Success
return true;
}
/**
* Mark the user of a conversation as "read" for a conversation
*
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* @param int $userID The ID of the user to update
* @param int $conversationID The ID of a conversation to update
* @return bool True for a success
*/
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public function markUserAsRead(int $userID, int $conversationID) : bool {
//Prepare database request
$tableName = $this->conversationsUsersTable;
$conditions = "ID_".$this->conversationsListTable." = ? AND ID_utilisateurs = ?";
$condVals = array(
$conversationID,
$userID
);
//Define new values
$newValues = array(
"saw_last_message" => 1
);
//Try to perform a request on the database
if(!CS::get()->db->updateDB($tableName, $conditions, $newValues, $condVals))
return false; //An error occured
//Success
return true;
}
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/**
* Send a new message
*
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* @param int $userID The ID of the user sending the message
* @param int $conversationID The ID of the target conversation
* @param string $message The message
* @param Mixed $image_path Optionnal, define the path to an image associated with the message
* @return bool True for a success
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*/
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public function sendMessage(int $userID, int $conversationID, string $message, $image_path = false) : bool{
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//GUIDE LINE : this method act like a "controller" : it doesn't perform any database operation
//But it manage all operations (insert message; save image; inform other users; ...)
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//First, try to insert the message
if(!$this->insertMessage($userID, $conversationID, $message, $image_path))
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return false; //An error occured
//Then, update the last activity of the conversation
if(!$this->updateLastActive($conversationID, time()))
return false; //An error occured (2)
//Then, set all the users of the conversation as unread
if(!$this->allUsersAsUnread($conversationID, array($userID)))
return false; //An error occured (3)
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//Success
return true;
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}
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/**
* Get the last messages of a conversation
*
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* @param int $conversationID The ID of the target conversation
* @param int $numberOfMessages The number of messages to return
* @return array The messages of the conversation
*/
public function getLastMessages(int $conversationID, int $numberOfMessages) : array {
//Define conditions
$conditions = "WHERE ID_".$this->conversationsListTable." = ? ORDER BY ID DESC LIMIT ".($numberOfMessages*1);
$condVals = array(
$conversationID
);
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//Perform request
$messages = $this->getMessages($conditions, $condVals);
//Revert messages order
$messages = array_reverse($messages);
//Return messages
return $messages;
}
/**
* Get the new messages of a conversation
*
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* @param int $conversationID The ID of the target conversation
* @param int $lastMessageID The ID of the last know message
* @return array A list of messages
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*/
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public function getNewMessages(int $conversationID, int $lastMessageID) : array {
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//Define conditions
$conditions = "WHERE ID_".$this->conversationsListTable." = ? AND ID > ? ORDER BY ID";
$condVals = array(
$conversationID,
$lastMessageID
);
//Perform request
$messages = $this->getMessages($conditions, $condVals);
//Return messages
return $messages;
}
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/**
* Check whether a conversation exists or not
*
* @param int $convID The ID of the conversation to check
* @return bool TRUE if it exists / false else
*/
public function exist(int $convID) : bool {
//Perform a request on the database
$tableName = $this->conversationsListTable;
return CS::get()->db->count($tableName, "WHERE ID = ?", array($convID)) > 0;
}
/**
* Delete a conversation
*
* Delete all the messages, membership and informations about a conversation
*
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* @param int $conID The conversation to delete
* @return bool True in case of success / False else
*/
public function delete_conversation(int $convID) : bool {
//Get all the messages of the conversation
$messages = $this->getMessages("WHERE ID_".$this->conversationsListTable." = ?", array($convID));
//Delete each message
foreach($messages as $message){
if(!$this->delete_message($message['ID'], $convID))
return false;
}
//Delete all the members of the conversation
if(!$this->delete_all_members($convID))
return false;
//Delete the conversation entry itself
if(!$this->delete_conversation_entry($convID))
return false;
//Success
return true;
}
/**
* Delete a conversation membership
*
* This function is just removing a user from a conversation by
* deleting all the messages the user has posted and removing its
* membership
*
* @param int $convID The target conversation
* @param int $memberID The ID of the member to delete from the conversation
* @return bool True in case of success / false else
*/
public function delete_member(int $convID, int $memberID) : bool {
//Get all the messages of member the conversation
$messages = $this->getMessages(
"WHERE ID_".$this->conversationsListTable." = ? AND ID_utilisateurs = ?",
array($convID, $memberID));
//Delete each message
foreach($messages as $message){
if(!$this->delete_message($message['ID'], $convID))
return false;
}
//Delete user membership
if(!$this->removeMember($convID, $memberID))
return false;
//Success
return true;
}
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/**
* Delete a single message of a conversation
*
* @param int $messageID The ID of the message to delete
* @param int $convID The target conversation
* @param array $informations Optionnal, informations about the message
* @return bool True in case of success / false else
*/
private function delete_message(int $messageID, int $convID, array $informations = null) : bool {
//Check if we have to fetch informations about the message
if(is_null($informations)){
$messages = $this->getMessages("WHERE ID_".$this->conversationsListTable." = ? AND ID = ?", array($convID, $messageID), false);
if(count($messages) == 0)
return false;
$informations = $messages[0];
}
//Check if we have to delete an image
if(!is_null($informations["image_path"]) AND $informations["image_path"] !== ""){
//Get system path of the image
$img_sys_path = path_user_data($informations["image_path"], true);
if(file_exists($img_sys_path)){
unlink($img_sys_path);
}
}
//Delete message from the database
$conditions = "ID = ?";
$condValues = array($messageID);
return CS::get()->db->deleteEntry($this->conversationsMessagesTable, $conditions, $condValues);
}
/**
* Delete all the members of a conversation
*
* @param int $convID The target conversation
* @return bool TRUE in case of success / false else
*/
private function delete_all_members(int $convID) : bool {
//Prepare request on the database
$conditions = "ID_".$this->conversationsListTable." = ?";
$values = array(
$convID
);
//Try to perform request
return CS::get()->db->deleteEntry($this->conversationsUsersTable, $conditions, $values);
}
/**
* Delete a conversation entry in the database
*
* @param int $convID The target conversation
* @return bool True in case of success / false else
*/
private function delete_conversation_entry(int $convID) : bool {
return CS::get()->db->deleteEntry($this->conversationsListTable, "ID = ?", array($convID));
}
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/**
* Get a list of conversation messages based on specified conditions
*
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* @param string $conditions The conditions of the request
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* @param Array $conditionsValues The values of the conditions (Optionnal)
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* @param bool $transformPath Transform the path of the files into URLS (true by default)
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* @return Array The list of messages
*/
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private function getMessages(string $conditions, array $conditionsValues = array(), bool $transformPath = true) : array{
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//Prepare database request
$tableName = $this->conversationsMessagesTable;
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//Define required fields
$requiredFields = array(
"ID",
"ID_utilisateurs AS ID_user",
"image_path",
"message",
"time_insert"
);
//Try to perform request on the database
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$messages = CS::get()->db->select($tableName, $conditions, $conditionsValues, $requiredFields);
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//Process each message
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if($transformPath){
array_walk($messages, function(&$item){
//Check if the image of the message is not null
if($item["image_path"] !== null && $item["image_path"] != ""){
//Replace image name with full URL
$item["image_path"] = path_user_data($item["image_path"]);
}
});
}
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//Return result
return $messages;
}
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}
//Register component
Components::register("conversations", new conversations());