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Fix "Undefined index" exception setting Meme text
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Authored by aklapper on Sep 16 2023, 12:14.
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Details

Summary

strlen() was used in Phabricator to check if a generic value is a non-empty string.
This behavior is deprecated since PHP 8.1. Phorge adopts phutil_nonempty_string() as a replacement.

Note: this may highlight other absurd input values that might be worth correcting
instead of just ignoring. If phutil_nonempty_string() throws an exception in your
instance, report it to Phorge to evaluate and fix that specific corner case.

EXCEPTION: (RuntimeException) Undefined index: above at [<arcanist>/src/error/PhutilErrorHandler.php:251]
 arcanist(), phorge()
   #0 <#2> PhutilErrorHandler::handleError(integer, string, string, integer, array) called at [<phorge>/src/applications/macro/engine/PhabricatorMemeEngine.php:276]

Closes T15637

Test Plan

Create a meme called "angrycat" from the /macro/ page, and try a comment like this, expecting no nuclear implosion:

{meme, src=angrycat, below=}
{meme, src=angrycat, above=}
{meme, src=angrycat, below=, above=}
{meme, src=angrycat, below=  , above=  }
{meme, src=angrycat, below=asd}
{meme, src=angrycat, above=asd}
{meme, src=angrycat, above=asd, below=dsa}
{meme, src=angrycat, above=   asd   , below=   dsa  }

Also carefully read the code with your big eyes, keeping in mind that strlen does not accept passing null in PHP 8, and looking at what we did in rPb4cfe56f03b44615ac9251aed8d74bf13b085051.

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Event Timeline

Fixed my dirty tree, sorry

Thanks

Maybe other people would like to propose a coalesce() and always trim() that and just have the if(phutil_nonempty...($)), but to be honest this is just correct and somehow minimal.

I tested this with:

{meme, src=angrycat, below=}

{meme, src=angrycat, above=}

{meme, src=angrycat, below=, above=}

{meme, src=angrycat, below=  , above=  }

{meme, src=angrycat, below=asd}

{meme, src=angrycat, above=asd}

{meme, src=angrycat, above=asd, below=dsa}

{meme, src=angrycat, above=   asd   , below=   dsa  }
This revision is now accepted and ready to land.Sep 29 2023, 07:54

There is a thing, to be honest. We are trimming the $above just in the test, but then we are not using the trimmed string in the rendering. So, the $v = coalesce($v, '') thing, and always trim() later, may still be better.

What about something like this?

So we add a bit of documentation, plus some commodity methods to avoid NULL at all costs, and only manage strings. So we have simpler business logic.

diff --git a/src/applications/macro/engine/PhabricatorMemeEngine.php b/src/applications/macro/engine/PhabricatorMemeEngine.php
index e1befc20a2..f97fb002ae 100644
--- a/src/applications/macro/engine/PhabricatorMemeEngine.php
+++ b/src/applications/macro/engine/PhabricatorMemeEngine.php
@@ -33,19 +33,39 @@ final class PhabricatorMemeEngine extends Phobject {
     return $this;
   }
 
+  /**
+   * @return wild
+   */
   public function getAboveText() {
     return $this->aboveText;
   }
 
+  /**
+   * @return string
+   */
+  public function getAboveTextStr() {
+    return phutil_string_cast($this->getAboveText());
+  }
+
   public function setBelowText($below_text) {
     $this->belowText = $below_text;
     return $this;
   }
 
+  /**
+   * @return wild
+   */
   public function getBelowText() {
     return $this->belowText;
   }
 
+  /**
+   * @return string
+   */
+  public function getBelowTextStr() {
+    return phutil_string_cast($this->getBelowText());
+  }
+
   public function getGenerateURI() {
     $params = array(
       'macro' => $this->getTemplate(),
@@ -272,16 +292,16 @@ final class PhabricatorMemeEngine extends Phobject {
     $font = $this->getFont();
     $size = $metrics['size'];
 
-    $above = $this->getAboveText();
-    if (strlen($above)) {
+    $above = trim($this->getAboveTextStr());
+    if ($above !== '') {
       $x = (int)floor(($dx - $metrics['text']['above']['width']) / 2);
       $y = $metrics['text']['above']['height'] + 12;
 
       $this->drawText($img, $font, $metrics['size'], $x, $y, $above);
     }
 
-    $below = $this->getBelowText();
-    if (strlen($below)) {
+    $below = trim($this->getBelowTextStr());
+    if ($below !== '') {
       $x = (int)floor(($dx - $metrics['text']['below']['width']) / 2);
       $y = $dy - 12 - $metrics['text']['below']['descend'];

@valerio.bozzolan: I've lost track a bit given the latest comments. Shall I commit the accepted version, or are changes required?

You have green light, feel free to land and thanks

Mine was just a proposal