Fix calendar emails to be outlook compatible

Signed-off-by: Anna Larch <anna@nextcloud.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/lib/private/Mail/Message.php b/lib/private/Mail/Message.php
index 01beefcc6d6..35d6f96d33a 100644
--- a/lib/private/Mail/Message.php
+++ b/lib/private/Mail/Message.php
@@ -76,6 +76,22 @@ class Message implements IMessage {
 	}
 
 	/**
+	 * Can be used to "attach content inline" as message parts with specific MIME type and encoding.
+	 * {@inheritDoc}
+	 * @since 26.0.0
+	 */
+	public function attachInline(string $body, string $name, string $contentType = null): IMessage {
+		# To be sure this works with iCalendar messages, we encode with 8bit instead of
+		# quoted-printable encoding. We save the current encoder, replace the current
+		# encoder with an 8bit encoder and after we've finished, we reset the encoder
+		# to the previous one. Originally intended to be added after the message body,
+		# as it is curently unknown if all mail clients handle this properly if added
+		# before.
+		$this->symfonyEmail->embed($body, $name, $contentType);
+		return $this;
+	}
+
+	/**
 	 * Converts the [['displayName' => 'email'], ['displayName2' => 'email2']] arrays to valid Adresses
 	 *
 	 * @param array $addresses Array of mail addresses
diff --git a/lib/public/Mail/IMessage.php b/lib/public/Mail/IMessage.php
index 35a67bc4bb8..b3cc86839f1 100644
--- a/lib/public/Mail/IMessage.php
+++ b/lib/public/Mail/IMessage.php
@@ -40,6 +40,18 @@ interface IMessage {
 	public function attach(IAttachment $attachment): IMessage;
 
 	/**
+	 * Can be used to "attach content inline" as message parts with specific MIME type and encoding.
+	 *
+	 * @param string $body body of the MIME part
+	 * @param string $name the file name
+	 * @param string|null $contentType MIME Content-Type (e.g. text/plain or text/calendar)
+	 *
+	 * @return IMessage
+	 * @since 26.0.0
+	 */
+	public function attachInline(string $body, string $name, string $contentType = null): IMessage;
+
+	/**
 	 * Set the from address of this message.
 	 *
 	 * If no "From" address is used \OC\Mail\Mailer will use mail_from_address and mail_domain from config.php