Merge pull request #21 from DirectoryTree/bug-20

Bug 20 - IDLE fails with Invalid message number when message moved/deleted after receiving

src/Connection/ImapCommand.php

@@ -22,6 +22,30 @@ public function __construct(
         protected array $tokens = [],
     ) {}
 
+    /**
+     * Get the IMAP tag.
+     */
+    public function tag(): string
+    {
+        return $this->tag;
+    }
+
+    /**
+     * Get the IMAP command.
+     */
+    public function command(): string
+    {
+        return $this->command;
+    }
+
+    /**
+     * Get the IMAP tokens.
+     */
+    public function tokens(): array
+    {
+        return $this->tokens;
+    }
+
     /**
      * Compile the command into lines for transmission.
      *
@@ -62,7 +86,7 @@ public function compile(): array
      */
     public function redacted(): ImapCommand
     {
-        return new ImapCommand($this->tag, $this->command, array_map(
+        return new static($this->tag, $this->command, array_map(
             function (mixed $token) {
                 return is_array($token)
                     ? array_map(fn () => '[redacted]', $token)

src/Exceptions/ImapCommandException.php

@@ -7,11 +7,42 @@
 
 class ImapCommandException extends Exception
 {
+    /**
+     * The IMAP response.
+     */
+    protected Response $response;
+
+    /**
+     * The failed IMAP command.
+     */
+    protected ImapCommand $command;
+
     /**
      * Make a new instance from a failed command and response.
      */
     public static function make(ImapCommand $command, Response $response): static
     {
-        return new static(sprintf('IMAP command "%s" failed. Response: "%s"', $command, $response));
+        $exception = new static(sprintf('IMAP command "%s" failed. Response: "%s"', $command, $response));
+
+        $exception->command = $command;
+        $exception->response = $response;
+
+        return $exception;
+    }
+
+    /**
+     * Get the failed IMAP command.
+     */
+    public function command(): ImapCommand
+    {
+        return $this->command;
+    }
+
+    /**
+     * Get the IMAP response.
+     */
+    public function response(): Response
+    {
+        return $this->response;
     }
 }

src/Folder.php

@@ -8,6 +8,7 @@
 use DirectoryTree\ImapEngine\Exceptions\Exception;
 use DirectoryTree\ImapEngine\Exceptions\ImapCapabilityException;
 use Illuminate\Contracts\Support\Arrayable;
+use Illuminate\Support\ItemNotFoundException;
 use JsonSerializable;
 
 class Folder implements Arrayable, JsonSerializable
@@ -115,8 +116,12 @@ function (int $msgn) use ($callback, $fetch) {
 
                 try {
                     $message = $fetch($msgn);
+                } catch (ItemNotFoundException) {
+                    // The message wasn't found. We will skip
+                    // it and continue awaiting new messages.
+                    return;
                 } catch (Exception) {
-                    // If fetching the message fails, we'll attempt
+                    // Something else happened. We will attempt
                     // reconnecting and re-fetching the message.
                     $this->mailbox->reconnect();
 

src/MessageQuery.php

@@ -9,6 +9,7 @@
 use DirectoryTree\ImapEngine\Connection\Responses\UntaggedResponse;
 use DirectoryTree\ImapEngine\Connection\Tokens\Atom;
 use DirectoryTree\ImapEngine\Enums\ImapFetchIdentifier;
+use DirectoryTree\ImapEngine\Exceptions\ImapCommandException;
 use DirectoryTree\ImapEngine\Pagination\LengthAwarePaginator;
 use DirectoryTree\ImapEngine\Support\ForwardsCalls;
 use DirectoryTree\ImapEngine\Support\Str;
@@ -531,9 +532,10 @@ public function paginate(int $perPage = 5, $page = null, string $pageName = 'pag
      */
     public function findOrFail(int $id, ImapFetchIdentifier $identifier = ImapFetchIdentifier::Uid)
     {
-        $uid = $this->uid($id, $identifier)
-            ->firstOrFail() // Untagged response
-            ->tokenAt(3) // ListData
+        /** @var UntaggedResponse $response */
+        $response = $this->uid($id, $identifier)->firstOrFail();
+
+        $uid = $response->tokenAt(3) // ListData
             ->tokenAt(1) // Atom
             ->value; // UID
 
@@ -545,6 +547,7 @@ public function findOrFail(int $id, ImapFetchIdentifier $identifier = ImapFetchI
      */
     public function find(int $id, ImapFetchIdentifier $identifier = ImapFetchIdentifier::Uid): ?Message
     {
+        /** @var UntaggedResponse $response */
         if (! $response = $this->uid($id, $identifier)->first()) {
             return null;
         }
@@ -557,11 +560,27 @@ public function find(int $id, ImapFetchIdentifier $identifier = ImapFetchIdentif
     }
 
     /**
-     * Get the UID for theb given identifier.
+     * Get the UID for the given identifier.
      */
     protected function uid(int $id, ImapFetchIdentifier $identifier = ImapFetchIdentifier::Uid): ResponseCollection
     {
-        return $this->connection()->uid([$id], $identifier);
+        try {
+            return $this->connection()->uid([$id], $identifier);
+        } catch (ImapCommandException $e) {
+            // IMAP servers may return an error if the message number is not found.
+            // If the identifier being used is a message number, and the message
+            // number is in the command tokens, we can assume this has occurred
+            // and safely ignore the error and return an empty collection.
+            if (
+                $identifier === ImapFetchIdentifier::MessageNumber
+                && in_array($id, $e->command()->tokens())
+            ) {
+                return ResponseCollection::make();
+            }
+
+            // Otherwise, re-throw the exception.
+            throw $e;
+        }
     }
 
     /**