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Class: Net::IMAP::FetchStruct

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Struct
Instance Chain:
self, Struct
Inherits: Struct
  • Object
Defined in: lib/net/imap/fetch_data.rb

Overview

FetchStruct is the superclass for FetchData and UIDFetchData. #fetch, #uid_fetch, #store, and #uid_store all return arrays of FetchStruct objects.

Fetch attributes

See [IMAP4rev1 §7.4.2] and [IMAP4rev2 §7.5.2] for a full description of the standard fetch response data items, and Net::IMAP@Message+envelope+and+body+structure for other relevant RFCs.

Static fetch data items

Most message attributes are static, and must never change for a given (server, account, mailbox, UIDVALIDITY, UID) tuple.

The static fetch data items defined by both IMAP4rev1 and IMAP4rev2 are:

  • "UID" — See #uid.

  • "BODY" — See #body.

  • "BODY[#{section_spec}]", "BODY[#{section_spec}]<#{offset}>" — See #message, #part, #header, #header_fields, #header_fields_not, #mime, and #text.

  • "BODYSTRUCTURE" — See #bodystructure.

  • "ENVELOPE" — See #envelope.

  • "INTERNALDATE" — See #internaldate.

  • "RFC822.SIZE" — See #rfc822_size.

IMAP4rev2 adds the additional fetch items from the BINARY extension [RFC3516]:

  • "BINARY[#{part}]", "BINARY[#{part}]<#{offset}>" – See #binary.

  • "BINARY.SIZE[#{part}]" – See #binary_size.

Several static message attributes in IMAP4rev1 are obsolete and been removed from IMAP4rev2:

  • "RFC822" — See #rfc822 or replace with "BODY[]" and #message.

  • "RFC822.HEADER" — See #rfc822_header or replace with "BODY[HEADER]" and #header.

  • "RFC822.TEXT" — See #rfc822_text or replace with "BODY[TEXT]" and #text.

::Net::IMAP supports static attributes defined by the following extensions:

  • OBJECTID [RFC8474]

    • "EMAILID" — See #emailid.

    • "THREADID" — See #threadid.

  • X-GM-EXT-1 [non-standard Gmail extension]

    • "X-GM-MSGID" — unique message ID. Access via #attr.

    • "X-GM-THRID" — Thread ID. Access via #attr.

NOTE:

Additional static fields are defined in other IMAP extensions, but Net::IMAP can’t parse them yet.

Dynamic message attributes

Some message attributes can be dynamically changed, for example using the STORE command.

The only dynamic message attribute defined by IMAP4rev1 and IMAP4rev2 is:

::Net::IMAP supports dynamic attributes defined by the following extensions:

NOTE:

Additional dynamic fields are defined in other IMAP extensions, but Net::IMAP can’t parse them yet.

Implicitly setting \Seen and using PEEK

Unless the mailbox has been opened as read-only, fetching BODY[#{section}] or BINARY[#{section}] will implicitly set the \Seen flag. To avoid this, fetch using BODY.PEEK[#{section}] or BINARY.PEEK[#{section}] instead.

NOTE:

The data will always be returned without the ".PEEK" suffix, as BODY[#{specifier}] or BINARY[#{section}].

Instance Method Summary

Instance Method Details

#attr_upcase ⇒ Hash

A transformation of #attr, with all the keys converted to upper case.

Header field names are case-preserved but not case-sensitive, so this is used by #header_fields and #header_fields_not.

[ GitHub ] 

  


# File 'lib/net/imap/fetch_data.rb', line 121



def attr_upcase; attr.transform_keys(&:upcase) end


  








  

    #binary(*part_nums, offset: nil)  ⇒ String?   



  

    

Returns the binary representation of a particular MIME part, which has already been decoded according to its Content-Transfer-Encoding.



See #part for a description of part_nums and offset.



This is the same as getting the value of "BINARY[#{part_nums.join(".")}]" or "BINARY[#{part_nums.join(".")}]<#{offset}>" from #attr.



The server must support either IMAP4rev2 or the BINARY extension [RFC3516].



See also: #binary_size, #mime


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 428



def binary(*part_nums, offset: nil)
  attr[section_attr("BINARY", part_nums, offset: offset)]
end


  








  

    #binary_size(*part_nums)  ⇒ Integer?   



  

    

Returns the decoded size of a particular MIME part (the size to expect in response to a BINARY fetch request).



See #part for a description of part_nums.



This is the same as getting the value of "BINARY.SIZE[#{part_nums.join(".")}]" from #attr.



The server must support either IMAP4rev2 or the BINARY extension [RFC3516].



See also: #binary, #mime


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 449



def binary_size(*part_nums)
  attr[section_attr("BINARY.SIZE", part_nums)]
end


  








  

    #body  ⇒ body structure?   



  

    

Returns an alternate form of #bodystructure, without any extension data.



This is the same as getting the value for "BODY" from #attr.


NOTE:




Use #message, #part, #header, #header_fields, #header_fields_not, #text, or #mime to retrieve BODY[#{section_spec}] attributes.




  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 133



def body; attr["BODY"] end


  








  

    #body_section_attr   (private)
  

  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 503



def body_section_attr(...) section_attr("BODY", ...) end


  








  

    #body_structure  
  



  

    

Alias for #bodystructure.


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 297



alias body_structure bodystructure


  








  

    #bodystructure  ⇒ BodyStructure struct?     Also known as: #body_structure
  



  

    

A BodyStructure object that describes the message, if it was fetched.



This is the same as getting the value for "BODYSTRUCTURE" from #attr.


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 295



def bodystructure; attr["BODYSTRUCTURE"] end


  








  

    #emailid  ⇒ String?   



  

    

An ObjectID that uniquely identifies the immutable content of a single message.



The server must return the same EMAILID for both the source and destination messages after a COPY or MOVE command.  However, it is possible for different messages with the same EMAILID to have different mutable attributes, such as flags.



This is the same as getting the value for "EMAILID" from #attr.



The server must support the OBJECTID extension [RFC8474].


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 482



def emailid; attr["EMAILID"] end


  








  

    #envelope  ⇒ Envelope?   



  

    

An Envelope object that describes the envelope structure of a message. See the documentation for Envelope for a description of the envelope structure attributes.



This is the same as getting the value for "ENVELOPE" from #attr.


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 307



def envelope; attr["ENVELOPE"] end


  








  

    #flags  ⇒ array of Symbols and Strings, or nil   



  

    

A array of flags that are set for this message.  System flags are symbols that have been capitalized by String#capitalize.  Keyword flags are strings and their case is not changed.



This is the same as getting the value for "FLAGS" from #attr.


NOTE:




The FLAGS field is dynamic, and can change for a uniquely identified message.




  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 320



def flags; attr["FLAGS"] end


  








  

    

      #header(*part_nums, offset: nil)  ⇒ String? 
      #header(*part_nums, fields: names, offset: nil)  ⇒ String? 
      #header(*part_nums, except: names, offset: nil)  ⇒ String? 
    

  



  

    

The [RFC5322] header of a message or of an encapsulated [MIME-IMT] MESSAGE/RFC822 or MESSAGE/GLOBAL message.



Headers can be parsed using the “mail” gem.



See #part for a description of part_nums and offset.



Without fields or except



This is the same as getting the value from #attr for one of:


  • 

    BODY[HEADER]
    

  • 

    BODY[HEADER]<#{offset}>
    

  • 

    BODY[#{part_nums.join "."}.HEADER]"
    

  • 

    BODY[#{part_nums.join "."}.HEADER]<#{offset}>"
    




With fields



When fields is sent, returns a subset of the header which contains only the header fields that match one of the names in the list.



This is the same as getting the value from #attr_upcase for one of:


  • 

    BODY[HEADER.FIELDS (#{names.join " "})]
    

  • 

    BODY[HEADER.FIELDS (#{names.join " "})]<#{offset}>
    

  • 

    BODY[#{part_nums.join "."}.HEADER.FIELDS (#{names.join " "})]
    

  • 

    BODY[#{part_nums.join "."}.HEADER.FIELDS (#{names.join " "})]<#{offset}>
    




See also: #header_fields



With except



When except is sent, returns a subset of the header which contains only the header fields that do not match one of the names in the list.



This is the same as getting the value from #attr_upcase for one of:


  • 

    BODY[HEADER.FIELDS.NOT (#{names.join " "})]
    

  • 

    BODY[HEADER.FIELDS.NOT (#{names.join " "})]<#{offset}>
    

  • 

    BODY[#{part_nums.join "."}.HEADER.FIELDS.NOT (#{names.join " "})]
    

  • 

    BODY[#{part_nums.join "."}.HEADER.FIELDS.NOT (#{names.join " "})]<#{offset}>
    




See also: #header_fields_not


  





  


  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 219



def header(*part_nums, fields: nil, except: nil, offset: nil)
  fields && except and
    raise ArgumentError, "conflicting 'fields' and 'except' arguments"
  if fields
    text = "HEADER.FIELDS (%s)" % [fields.join(" ").upcase]
    attr_upcase[body_section_attr(part_nums, text, offset: offset)]
  elsif except
    text = "HEADER.FIELDS.NOT (%s)" % [except.join(" ").upcase]
    attr_upcase[body_section_attr(part_nums, text, offset: offset)]
  else
    attr[body_section_attr(part_nums, "HEADER", offset: offset)]
  end
end


  








  

    #header_fields(*names, part: [], offset: nil)  ⇒ String?   



  

    

The result from #header when called with fields: names.


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 237



def header_fields(first, *rest, part: [], offset: nil)
  header(*part, fields: [first, *rest], offset: offset)
end


  








  

    #header_fields_not(*names, part: [], offset: nil)  ⇒ String?   



  

    

The result from #header when called with except: names.


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 245



def header_fields_not(first, *rest, part: [], offset: nil)
  header(*part, except: [first, *rest], offset: offset)
end


  








  

    #internal_date  
  



  

    

Alias for #internaldate.


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 339



alias internal_date internaldate


  








  

    #internaldate  ⇒ Time?     Also known as: #internal_date
  



  

    

The internal date and time of the message on the server.  This is not the date and time in the [RFC5322] header, but rather a date and time which reflects when the message was received.



This is similar to getting the value for "INTERNALDATE" from #attr.


NOTE:




attr["INTERNALDATE"] returns a string, and this method returns a Time object.




  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 335



def internaldate
  attr["INTERNALDATE"]&.then { IMAP.decode_time _1 }
end


  








  

    #message(offset: bytes)  ⇒ String?   



  

    

The RFC5322 expression of the entire message, as a string.



See #part for a description of offset.



RFC5322 messages can be parsed using the “mail” gem.



This is the same as getting the value for "BODY[]" or "BODY[]<#{offset}>" from #attr.



See also: #header, #text, and #mime.


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 149



def message(offset: nil) attr[body_section_attr(offset: offset)] end


  








  

    

      #mime(*part_nums)  ⇒ String? 
      #mime(*part_nums, offset: bytes)  ⇒ String? 
    

  



  

    

The [MIME-IMB] header for a message part, if it was fetched.



See #part for a description of part_nums and offset.



This is the same as getting the value for "BODY[#{part_nums}.MIME]" or "BODY[#{part_nums}.MIME]<#{offset}>" from #attr.



See also: #message, #header, and #text.


  





  


  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 263



def mime(part, *subparts, offset: nil)
  attr[body_section_attr([part, *subparts], "MIME", offset: offset)]
end


  








  

    #modseq  ⇒ Integer?   



  

    

The modification sequence number associated with this ::Net::IMAP message.



This is the same as getting the value for "MODSEQ" from #attr.



The server must support the CONDSTORE extension [RFC7162].


NOTE:




The MODSEQ field is dynamic, and can change for a uniquely identified message.




  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 465



def modseq; attr["MODSEQ"] end


  








  

    #part(*part_nums, offset: bytes)  ⇒ String?   



  

    

The string representation of a particular MIME part.



part_nums forms a path of MIME part numbers, counting up from 1, which may specify an arbitrarily nested part, similarly to Array#dig. Messages that don’t use MIME, or MIME messages that are not multipart and don’t hold an encapsulated message, only have part 1.



If a zero-based offset is given, the returned string is a substring of the entire contents, starting at that origin octet.  This means that BODY[]<0> MAY be truncated, but BODY[] is never truncated.



This is the same as getting the value of "BODY[#{part_nums.join(".")}]" or "BODY[#{part_nums.join(".")}]<#{offset}>" from #attr.



See also: #message, #header, #text, and #mime.


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 171



def part(index, *subparts, offset: nil)
  attr[body_section_attr([index, *subparts], offset: offset)]
end


  








  

    #rfc822  ⇒ String?   



  

    

Semantically equivalent to #message with no arguments.



This is the same as getting the value for "RFC822" from #attr.


NOTE:




IMAP4rev2 deprecates RFC822.




  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 349



def rfc822; attr["RFC822"] end


  








  

    #rfc822_header  ⇒ String?   



  

    

Semantically equivalent to #header, with no arguments.



This is the same as getting the value for "RFC822.HEADER" from #attr.


NOTE:




IMAP4rev2 deprecates RFC822.HEADER.




  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 386



def rfc822_header; attr["RFC822.HEADER"] end


  








  

    #rfc822_size  ⇒ Integer?   



  

    

A number expressing the [RFC5322] size of the message.



This is the same as getting the value for "RFC822.SIZE" from #attr.


NOTE:




IMAP was originally developed for the older RFC822 standard, and as a consequence several fetch items in IMAP incorporate “RFC822” in their name.  With the exception of RFC822.SIZE, there are more modern replacements; for example, the modern version of RFC822.HEADER is BODY.PEEK[HEADER].  In all cases, “RFC822” should be interpreted as a reference to the updated RFC5322 standard.




  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 368



def rfc822_size; attr["RFC822.SIZE"] end


  








  

    #rfc822_text  ⇒ String?   



  

    

Semantically equivalent to #text, with no arguments.



This is the same as getting the value for "RFC822.TEXT" from #attr.


NOTE:




IMAP4rev2 deprecates RFC822.TEXT.




  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 397



def rfc822_text; attr["RFC822.TEXT"] end


  








  

    #section_attr(attr, part = [], text = nil, offset: nil)   (private)
  

  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 505



def section_attr(attr, part = [], text = nil, offset: nil)
  spec = Array(part).flatten.map { Integer(_1) }
  spec << text if text
  spec = spec.join(".")
  if offset then "%s[%s]<%d>" % [attr, spec, Integer(offset)] else "%s[%s]" % [attr, spec] end
end


  








  

    #size  
  



  

    

Alias for: rfc822_size


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 375



def size; rfc822_size end


  








  

    

      #text(*part_nums)  ⇒ String? 
      #text(*part_nums, offset: bytes)  ⇒ String? 
    

  



  

    

The text body of a message or a message part, if it was fetched, omitting the [RFC5322] header.



See #part for a description of part_nums and offset.



This is the same as getting the value from #attr for one of:


  • 

    "BODY[TEXT]",
    

  • 

    "BODY[TEXT]<#{offset}>",
    

  • 

    "BODY[#{section}.TEXT]", or
    

  • 

    "BODY[#{section}.TEXT]<#{offset}>".
    




See also: #message, #header, and #mime.


  





  


  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 284



def text(*part, offset: nil)
  attr[body_section_attr(part, "TEXT", offset: offset)]
end


  








  

    #threadid  ⇒ String?   



  

    

An ObjectID that uniquely identifies a set of messages that the server believes should be grouped together.



It is generally based on some combination of References, In-Reply-To, and Subject, but the exact implementation is left up to the server implementation.  The server should return the same thread identifier for related messages, even if they are in different mailboxes.



This is the same as getting the value for "THREADID" from #attr.



The server must support the OBJECTID extension [RFC8474].


  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 499



def threadid; attr["THREADID"] end


  








  

    #uid  ⇒ Integer?   



  

    

A number expressing the unique identifier of the message.



This is the same as getting the value for "UID" from #attr.


NOTE:




For UIDFetchData, this returns the uniqueid at the beginning of the UIDFETCH response, not the value from #attr.




  



  [ GitHub ]


  

  


# File 'lib/net/imap/fetch_data.rb', line 408



def uid; attr["UID"] end