Adds possibility to post photos.

With this it is possible to post a photo note with a description, nothing
more. It doesn't move the file in the file system, just posts it from
the temp location to the users server. It also does validate for file size,
content type and max upload size and shows the errors to the user.

If everything goes according to plan the response from the users server
is shown, together with a link with the posted photos URL.

1 files changed, 75 insertions, 10 deletions

diff --git a/lib/helpers.php b/lib/helpers.php
index 4f6b4c1..ad16e1b 100644
--- a/lib/helpers.php
+++ b/lib/helpers.php
@@ -70,9 +70,9 @@ function get_timezone($lat, $lng) {
   return null;
 }
 
-function micropub_post_for_user(&$user, $params) {
+function micropub_post_for_user(&$user, $params, $file_path = NULL) {
   // Now send to the micropub endpoint
-  $r = micropub_post($user->micropub_endpoint, $params, $user->micropub_access_token);
+  $r = micropub_post($user->micropub_endpoint, $params, $user->micropub_access_token, $file_path);
 
   $user->last_micropub_response = substr(json_encode($r), 0, 1024);
   $user->last_micropub_response_date = date('Y-m-d H:i:s');
@@ -90,21 +90,33 @@ function micropub_post_for_user(&$user, $params) {
   return $r;
 }
 
-function micropub_post($endpoint, $params, $access_token) {
+function micropub_post($endpoint, $params, $access_token, $file_path = NULL) {
   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $endpoint);
-  curl_setopt($ch, CURLOPT_HTTPHEADER, array(
-    'Authorization: Bearer ' . $access_token
-  ));
   curl_setopt($ch, CURLOPT_POST, true);
-  $post = http_build_query(array_merge(array(
-    'h' => 'entry'
-  ), $params));
-  $post = preg_replace('/%5B[0-9]+%5D/', '%5B%5D', $post); // change [0] to []
+
+  $httpheaders = array('Authorization: Bearer ' . $access_token);
+  $params = array_merge(array('h' => 'entry'), $params);
+
+  if(!$file_path) {
+    $post = http_build_query($params);
+    $post = preg_replace('/%5B[0-9]+%5D/', '%5B%5D', $post); // change [0] to []
+  } else {
+    $finfo = finfo_open(FILEINFO_MIME_TYPE);
+    $mimetype = finfo_file($finfo, $file_path);
+    $multipart = new p3k\Multipart();
+    $multipart->addArray($params);
+    $multipart->addFile('photo', $file_path, $mimetype);
+    $post = $multipart->data();
+    array_push($httpheaders, 'Content-Type: ' . $multipart->contentType());
+  }
+
+  curl_setopt($ch, CURLOPT_HTTPHEADER, $httpheaders);
   curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
   curl_setopt($ch, CURLOPT_HEADER, true);
   curl_setopt($ch, CURLINFO_HEADER_OUT, true);
+
   $response = curl_exec($ch);
   $error = curl_error($ch);
   $sent_headers = curl_getinfo($ch, CURLINFO_HEADER_OUT);
@@ -215,4 +227,57 @@ function instagram_client() {
   ));
 }
 
+function validate_photo(&$file) {
+  try {
 
+    if ($_SERVER['REQUEST_METHOD'] == 'POST' && count($_POST) < 1 ) {
+      throw new RuntimeException('File upload size exceeded.');
+    }
+   
+    // Undefined | Multiple Files | $_FILES Corruption Attack
+    // If this request falls under any of them, treat it invalid.
+    if (
+        !isset($file['error']) ||
+        is_array($file['error'])
+    ) {
+        throw new RuntimeException('Invalid parameters.');
+    }
+
+    // Check $file['error'] value.
+    switch ($file['error']) {
+        case UPLOAD_ERR_OK:
+            break;
+        case UPLOAD_ERR_NO_FILE:
+            throw new RuntimeException('No file sent.');
+        case UPLOAD_ERR_INI_SIZE:
+        case UPLOAD_ERR_FORM_SIZE:
+            throw new RuntimeException('Exceeded filesize limit.');
+        default:
+            throw new RuntimeException('Unknown errors.');
+    }
+
+    // You should also check filesize here.
+    if ($file['size'] > 1000000) {
+        throw new RuntimeException('Exceeded filesize limit.');
+    }
+
+    // DO NOT TRUST $file['mime'] VALUE !!
+    // Check MIME Type by yourself.
+    $finfo = new finfo(FILEINFO_MIME_TYPE);
+    if (false === $ext = array_search(
+        $finfo->file($file['tmp_name']),
+        array(
+            'jpg' => 'image/jpeg',
+            'png' => 'image/png',
+            'gif' => 'image/gif',
+        ),
+        true
+    )) {
+        throw new RuntimeException('Invalid file format.');
+    }
+
+  } catch (RuntimeException $e) {
+
+      return $e->getMessage();
+  }
+}
\ No newline at end of file