Handles user login and logout

functions/errors.php

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+<?php
+/**
+ * Error functions
+ *
+ * @author Pierre HUBERT
+ */
+
+/**
+ * Display a rest fatal error
+ *
+ * @param Integer $errorCode The code of the error
+ * @param String $errorMessage The message of the error
+ */
+function Rest_fatal_error($errorCode, $errorMessage){
+    //Returns a fatal error code
+    http_response_code($errorCode);
+
+    //Display message
+    header("Content-Type: application/json");
+
+    echo json_encode(array(
+        "error" => array(
+            "code"=>$errorCode,
+            "message" => $errorMessage,
+        )
+    ), JSON_PRETTY_PRINT);
+
+    //Quit
+    exit();
+}

functions/strings.php

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+<?php
+/**
+ * API specific methods
+ *
+ * @author Pierre HUBERT
+ */
+
+/**
+ * Generate a random string, using a cryptographically secure 
+ * pseudorandom number generator (random_int)
+ * 
+ * @param int $length      How many characters do we want?
+ * @param string $keyspace A string of all possible characters
+ *                         to select from
+ * @return string
+ */
+function random_str($length, $keyspace = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ')
+{
+    $str = '';
+    $max = mb_strlen($keyspace, '8bit') - 1;
+    for ($i = 0; $i < $length; ++$i) {
+        $str .= $keyspace[random_int(0, $max)];
+    }
+    return $str;
+}