NAME

       Mail::SpamAssassin::Message::Node - decode, render, and make available MIME message parts

DESCRIPTION

       This module will encapsulate an email message and allow access to the various MIME message parts.

PUBLIC METHODS

       new()
           Generates an empty Node object and returns it.  Typically only called by functions in Message.

       find_parts()
           Used to search the tree for specific MIME parts.  An array of matching Node objects (pointers into
           the tree) is returned.  The parameters that can be passed in are (in order, all scalars):

           Regexp - Used to match against each part's Content-Type header, specifically the type and not the
           rest of the header.  ie: "Content-type: text/html; encoding=quoted-printable" has a type of
           "text/html".  If no regexp is specified, find_parts() will return an empty array.

           Only_leaves - By default, find_parts() will return any part that matches the regexp, including
           multipart.  If you only want to see leaves of the tree (ie: parts that aren't multipart), set this to
           true (1).

           Recursive - By default, when find_parts() finds a multipart which has parts underneath it, it will
           recurse through all sub-children.  If set to 0, only look at the part and any direct children of the
           part.

       header()
           Stores and retrieves headers from a specific MIME part.  The first parameter is the header name.  If
           there is no other parameter, the header is retrieved.  If there is a second parameter, the header is
           stored.

           Header names are case-insensitive and are stored in both raw and decoded form.  Using header(), only
           the decoded form is retrievable.

           For retrieval, if header() is called in an array context, an array will be returned with each header
           entry in a different element.  In a scalar context, the last specific header is returned.

           ie: If 'Subject' is specified as the header, and there are 2 Subject headers in a message, the
           last/bottom one in the message is returned in scalar context or both are returned in array context.

       raw_header()
           Retrieves the raw version of headers from a specific MIME part.  The only parameter is the header
           name.  Header names are case-insensitive.

           For retrieval, if raw_header() is called in an array context, an array will be returned with each
           header entry in a different element.  In a scalar context, the last specific header is returned.

           ie: If 'Subject' is specified as the header, and there are 2 Subject headers in a message, the
           last/bottom one in the message is returned in scalar context or both are returned in array context.

       add_body_part()
           Adds a Node child object to the current node object.

       is_leaf()
           Returns true if the tree node in question is a leaf of the tree (ie: has no children of its own).
           Note: This function may return odd results unless the message has been mime parsed via _do_parse()!

       raw()
           Return a reference to the the raw array.  Treat this as READ ONLY.

       decode()
           If necessary, decode the part text as base64 or quoted-printable.  The decoded text will be returned
           as a scalar string.  An optional length parameter can be passed in which limits how much decoded data
           is returned.  If the scalar isn't needed, call with "0" as a parameter.

       rendered()
           render_text() takes the given text/* type MIME part, and attempts to render it into a text scalar.
           It will always render text/html, and will use a heuristic to determine if other text/* parts should
           be considered text/html.  Two scalars are returned: the rendered type (either text/html or whatever
           the original type was), and the rendered text.

       set_rendered($text, $type)
           Set the rendered text and type for the given part.  If type is not specified, and text is a defined
           value, a default of 'text/plain' is used.  This can be used, for instance, to render non-text parts
           using plugins.

       visible_rendered()
           Render and return the visible text in this part.

       invisible_rendered()
           Render and return the invisible text in this part.

       content_summary()
           Returns an array of scalars describing the mime parts of the message.  Note: This function requires
           that the message be parsed first!

       delete_header()
           Delete the specified header (decoded and raw) from the Node information.

       get_header()
           Retrieve a specific header.  Will have a newline at the end and will be unfolded.  The first
           parameter is the header name (case-insensitive), and the second parameter (optional) is whether or
           not to return the raw header.

           If get_header() is called in an array context, an array will be returned with each header entry in a
           different element.  In a scalar context, the last specific header is returned.

           ie: If 'Subject' is specified as the header, and there are 2 Subject headers in a message, the
           last/bottom one in the message is returned in scalar context or both are returned in array context.

           Btw, returning the last header field (not the first) happens to be consistent with DKIM signatures,
           which search for and cover multiple header fields bottom-up according to the 'h' tag. Let's keep it
           this way.

       get_all_headers()
           Retrieve all headers.  Each header will have a newline at the end and will be unfolded.  The first
           parameter (optional) is whether or not to return the raw headers, and the second parameter (optional)
           is whether or not to include the mbox separator.

           If get_all_header() is called in an array context, an array will be returned with each header entry
           in a different element.  In a scalar context, the headers are returned in a single scalar.