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--- reference:attachment_processing_script [2018/06/28 08:41] – created paul
+++ reference:attachment_processing_script [2022/11/24 09:29] (current) – [IsLockNeeded] paul
@@ Line 10: / Line 10: @@
   * IsLockNeeded
   * RewriteAttachment
+====NeedsRecode====
+  function NeedsRecode(filtervariables, attachments_array, mime_structure)
+Called when VPOP3 is about to process a message
+  * returns True if the Lua script wants to alter any of the attachments of the whole message
+====NeedsRewrite====
+  function NeedsRewrite(attachmentname, MIMEtype, filtervariables)
+Called when VPOP3 is about to process an attachment in a message (Only called if 'NeedsRecode' returned true, or there is some other reason for VPOP3 to process attachments, eg to remove/rename an attachment due to Attachment Filtering)
+  * returns True if the Lua script wants to rewrite/rename the attachment
+====GetRename====
+  function GetRename(type, attachmentName, MIMEtype, filterVariables)
+  * type = MIME or UUENCODE
+  * returns two values, the first is the new filename, the second is the new MIME type (eg 'text/plain', 'image/jpeg', etc)
+====GetContentDispositionLine====
+  function GetContentDispositionLine(originalContentDispositionLine, type, attachmentName, rewriteSection, MIMEtype, filterVariables)
+  * type = MIME
+  * rewriteSection = true if the MIME section will be rewritten (eg because of 'NeedsRewrite' function)
+  * returns new Content-Disposition MIME header line
+====IsLockNeeded====
+  function IsLockNeeded(originalFileName, newFileName, originalAttachmentName, MIMEtype)
+  * returns True if a critical section is required around the 'RewriteAttachment' function call (so it is not called multiple times in parallel)
+==RewriteAttachment====
+  function RewriteAttachment(originalFileName, newFileName, originalAttachmentName, MIMEtype, filterVariables)
+Called to give the script a chance to rewrite the attachment. The original attachment is stored in the file 'originalFileName'. The script should write the new attachment to 'newFileName'.
+Note that whether or not this function alters the attachment, the attachment data in the message is rewritten using Base64 encoding, so if the original attachment was stored using a different encoding (eg Quoted-Printable) then the message will be changed. 'NeedsRewrite' should return False if you want the message to stay unaltered.
+  * returns True if the attachment has actually been rewritten. If not, the original one is used.

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