Implement uhhh a lot of stuff

main.php

@@ -6,20 +6,44 @@ session_start();
 
 $_dr = $_SERVER['DOCUMENT_ROOT'];
 // TODO: Make configurable in .ini
-$GLOBALS['path_media'] = '/srv/http/boorein/media';
+
-$GLOBALS['base_media'] = 'media';
+// Actual filesystem
-$GLOBALS['base_uri'] =
+$GLOBALS['path_root'] = '/srv/http/boorein';
+$GLOBALS['path_media'] = $GLOBALS['path_root'] . '/media';
+$GLOBALS['path_mediadb'] = $GLOBALS['path_root'] . '/media.db';
+// Uri addressed
+$GLOBALS['base_root'] =
   $_SERVER['REQUEST_SCHEME'] . '://' . $_SERVER['HTTP_HOST'];
+$GLOBALS['base_media'] = 'media';
+
 
 header('Content-Type: application/json');
 
-(match ([$_SERVER['REQUEST_URI'], $_SERVER['REQUEST_METHOD']]) {
+// ----- ROUTER -----
+(match ([$_SERVER['DOCUMENT_URI'], $_SERVER['REQUEST_METHOD']]) {
   ['/item',   'POST'] => post_item(),
-    //['/item',   'GET']  => get_item(),
+  ['/item',   'GET']  => get_item(),
     //['/search', 'GET']  => get_search(),
   default  => Json::error('Not implemented')
 })->die();
 
+
+function get_item()
+{
+  $id = $_GET['q'] ?? false;
+  if (!$id) Json::error('ID not specified')->die();
+
+  $media_db = new MediaDB();
+
+  $item = Item::load($media_db, $id);
+
+  if ($item === null) {
+    Json::error('No item was found with the given ID')->die();
+  }
+
+  return Json::new($item->getUri());
+}
+
 function post_item()
 {
   // The checks are performed internally
@@ -32,10 +56,82 @@ function post_item()
   ]);
 };
 
+class MediaDB
+{
+  private $handler;
+  private bool $finished = false;
+  private array $lines = [];
+
+  public function __construct()
+  {
+    // Just initialize the file handler
+    $this->handler = fopen($GLOBALS['path_mediadb'], 'r');
+    if ($this->handler === false)
+      Json::error('Error opening media DB');
+  }
+
+  private function getLine(): ?array
+  {
+    $ret = fgetcsv($this->handler, 0, ' ');
+    if ($ret === false)
+      return null;
+
+    return $ret;
+  }
+
+  public function map(callable $func)
+  {
+    // First read from what's already in memory
+    foreach ($this->lines as $i_line) {
+      if ($func($i_line) === false) return;
+    }
+
+    // REVIEW: Maybe this isn't needed cuz the while would be as eficient
+    //         anyway?
+
+    // If we already got to the end, there's no sense in carrying on
+    if ($this->finished) return;
+
+    // If we run out, read from the file and append to array so the next lookup
+    // is fast
+    while ($line = $this->getLine()) {
+      $this->lines[] = $line;
+
+      if ($func($line) === false) return;
+    }
+
+    // Set the flag so we don't reach this point two times
+    $this->finished = true;
+  }
+}
+
 class Item
 {
+  // TODO: Change to id here in all occurrences
   private string $hash;
   private string $extension;
+  private array $tags = [];
+
+  public static function load(MediaDB $db, string $id): ?Item
+  {
+    $ret = null;
+
+    $db->map(function ($line) use (&$ret, $id) {
+      if ($line[0] == $id) {
+        $ret = new Item();
+        $ret->hash = array_shift($line);
+        $ret->tags = $line;
+        $ret->extensionFromTags();
+
+        return true;
+      }
+
+      return false;
+    });
+
+    return $ret;
+  }
+
 
   // ::upload() requires the PHP file upload ARRAY from $_FILES
   public static function upload(array $php_file): Item
@@ -51,7 +147,7 @@ class Item
     // --- INITIALIZE ---
     $ret = new Item();
     $ret->hash = hash_file('sha256', $from_path);
-    $ret->calculateExtension($php_file);
+    $ret->extensionFromUpload($php_file);
 
     // --- ACTUALLY GRAB FILE ---
     $new_path = $ret->getPath();
@@ -63,8 +159,19 @@ class Item
     return $ret;
   }
 
+  private function extensionFromTags()
+  {
+    foreach ($this->tags as $i_tag) {
+      $parts = explode(':', $i_tag);
+      if ($parts[0] == 'format') {
+        $this->extension = $parts[1];
+        return;
+      }
+    }
+  }
+
   // Assumes is_uploaded_file has been done
-  private function calculateExtension(array $php_file)
+  private function extensionFromUpload(array $php_file)
   {
     $path = $php_file['tmp_name'] ?? false;
     $name = $php_file['name'] ?? null;
@@ -121,9 +228,10 @@ class Item
   }
   public function getUri(): string
   {
+    // TODO: Implement relative
     return sprintf(
       '%s/%s/%s.%s',
-      $GLOBALS['base_uri'],
+      $GLOBALS['base_root'],
       $GLOBALS['base_media'],
       $this->hash,
       $this->extension,