deletefood.php

<?php
include "./utils.php";
$food_id = $_GET["food"];
$service_id = $_GET["service"];

// Authenticate using provided service ID.
$service_id = strtolower($service_id);
if ($service_id != preg_replace("/[^a-f0-9]/", '', $service_id)) { // Check to see if the service identifier contains disallowed characters.
    echo "{\"error\": {\"id\": \"invalid_service\", \"reason\": \"disallowed_characters\", \"description\": \"The service identifier contains invalid characters.\"}}";
    exit();
}
if (strlen($service_id) > 100) { // Check to see if the service identifier is excessively long.
    echo "{\"error\": {\"id\": \"invalid_service\", \"reason\": \"too_long\", \"description\": \"The service identifier is excessively long.\"}}";
    exit();
} else if (strlen($service_id) < 8) {
    echo "{\"error\": {\"id\": \"invalid_service\", \"reason\": \"too_short\", \"description\": \"The service identifier is too short.\"}}";
    exit();
}

include "./servicedata.php";
$services = load_servicedata();

$associated_user = find_serviceid($service_id, $services); // Search for the provided service ID in the service database.
if ($associated_user == false) {
    echo "{\"error\": {\"id\": \"invalid_service\", \"reason\": \"not_found\", \"description\": \"The specified service identifier does not exist.\"}}";
    exit();
}

if (check_permissions_action($service_id, "foods-delete", $services) == false) {
    echo "{\"error\": {\"id\": \"invalid_service\", \"reason\": \"permission_denied\", \"description\": \"The specified service identifier does not have permission to delete foods.\"}}";
    exit();
}

include "./fooddata.php";
include "./healthdata.php";
include "./metrics.php";
$metrics = load_metrics();
for ($x = 0; $x <= 10; $x++) { // Run 10 times, checking to see if this file is unlocked.
    if (is_file_unlocked($food_database_filepath)) {
        lock_file($food_database_filepath);
        $food_data = load_food();
        break; // Exit the loop
    } else {
        usleep(100*1000); // Wait briefly for the file to become unlocked.
    }
}
if (!isset($food_data)) { // Check to see if the health data was never loaded after several checks in the previous step.
    echo "{\"error\": {\"id\": \"system\", \"reason\": \"file_is_locked\", \"description\": \"The food data file is locked for writing by another process.\"}}";
    exit();
}
for ($x = 0; $x <= 10; $x++) { // Run 10 times, checking to see if this file is unlocked.
    if (is_file_unlocked($healthdata_database_filepath)) {
        lock_file($healthdata_database_filepath);
        $health_data = load_healthdata();
        break; // Exit the loop
    } else {
        usleep(100*1000); // Wait briefly for the file to become unlocked.
    }
}
if (!isset($health_data)) { // Check to see if the health data was never loaded after several checks in the previous step.
    echo "{\"error\": {\"id\": \"system\", \"reason\": \"file_is_locked\", \"description\": \"The health data file is locked for writing by another process.\"}}";
    exit();
}


if ($food_id != preg_replace("/[^a-zA-Z0-9\-_]/", '', $food_id)) { // Check to see if the provided food_id contains disallowed values.
    echo "{\"error\": {\"id\": \"invalid_id\", \"description\": \"The submitted food_id is invalid because it contains disallowed characters.\"}}";
    unlock_file($food_database_filepath);
    unlock_file($healthdata_database_filepath);
    exit();
} else if (strlen($food_id) >= 100) { // Check of the provided food_id is excessively long.
    echo "{\"error\": {\"id\": \"invalid_id\", \"description\": \"The submitted food_id is invalid because it is excessively long.\"}}";
    unlock_file($food_database_filepath);
    unlock_file($healthdata_database_filepath);
    exit();
}

if (!in_array($food_id, array_keys($food_data["entries"][$associated_user]["foods"]))) {
    echo "{\"error\": {\"id\": \"invalid_id\", \"description\": \"The specified food_id does not exist in this user's food database.\"}}";
    unlock_file($food_database_filepath);
    unlock_file($healthdata_database_filepath);
    exit();
}


// Remove any datapoints that reference this food ID.
$healthdata_modified = false; // This will be switched to true if the health data has been modified (and needs to be saved).
if (in_array($associated_user, array_keys($health_data))) { // Check to see if this user exists in the health database.
    foreach (array_keys($metrics) as $category) { // Iterate through each category.
        foreach (array_keys($metrics[$category]["metrics"]) as $metric) { // Iterate through each metric.
            $validation_index = 0;
            foreach ($metrics[$category]["metrics"][$metric]["validation"] as $validation) { // Iterate through each validation rule.
                $corresponding_key_name = $metrics[$category]["metrics"][$metric]["keys"][$validation_index];
                if ($validation == "foodid") { // Check to see if this metric makes use of food IDs.
                    if (isset($health_data[$associated_user][$category][$metric])) { // Check to see if this user has any datapoints for this metric.
                        foreach (array_keys($health_data[$associated_user][$category][$metric]) as $datapoint) { // Iterate through each validation rule.
                            if ($health_data[$associated_user][$category][$metric][$datapoint]["data"][$corresponding_key_name] == $food_id) { // Check to see if the food connected to this datapoint is the same as the food we are currently deleting.
                                $healthdata_modified = true;
                                $health_data = delete_datapoint($health_data, $associated_user, $category, $metric, $datapoint); // Erase this datapoint.
                            }
                        }
                    }
                }
                $validation_index = $validation_index + 1;
            }
        }
    }
}
if ($healthdata_modified == true) {
    save_healthdata($health_data);
}

unset($food_data["entries"][$associated_user]["foods"][$food_id]);
save_food($food_data);
unlock_file($food_database_filepath);
unlock_file($healthdata_database_filepath);
echo "{\"success\": {\"description\": \"The '" . $food_id . "' food has been deleted.\"}}";
?>