Provides access to a header object.
2.2. Header Fields Header fields are lines composed of a field name, followed by a colon (":"), followed by a field body, and terminated by CRLF. A field name MUST be composed of printable US-ASCII characters (i.e., characters that have values between 33 and 126, inclusive), except colon. A field body may be composed of any US-ASCII characters, except for CR and LF. However, a field body may contain CRLF when used in header "folding" and "unfolding" as described in section 2.2.3. All field bodies MUST conform to the syntax described in sections 3 and 4 of this standard.
Creates a new header object.
Accepts raw text or nothing. If given raw text will attempt to parse it and split it into the various fields, instantiating each field as it goes.
If it finds a field that should be a structured field (such as content type), but it fails to parse it, it will simply make it an unstructured field and leave it alone. This will mean that the data is preserved but no automatic processing of that field will happen. If you find one of these cases, please make a patch and send it in, or at the least, send me the example so we can fix it.
# File lib/mail/header.rb, line 35 def initialize(header_text = nil) self.raw_source = header_text.to_crlf split_header if header_text end
3.6. Field definitions The following table indicates limits on the number of times each field may occur in a message header as well as any special limitations on the use of those fields. An asterisk next to a value in the minimum or maximum column indicates that a special restriction appears in the Notes column. <snip table from 3.6>
As per RFC, many fields can appear more than once, we will return a string of the value if there is only one header, or if there is more than one matching header, will return an array of values in order that they appear in the header ordered from top to bottom.
Example:
h = Header.new h.fields = ['To: mikel@me.com', 'X-Mail-SPAM: 15', 'X-Mail-SPAM: 20'] h['To'] #=> 'mikel@me.com' h['X-Mail-SPAM'] #=> ['15', '20']
# File lib/mail/header.rb, line 108 def [](name) name = dasherize(name) selected = select_field_for(name) case when selected.length > 1 selected.map { |f| f } when !selected.blank? selected.first else nil end end
Sets the FIRST matching field in the header to passed value, or deletes the FIRST field matched from the header if passed nil
Example:
h = Header.new h.fields = ['To: mikel@me.com', 'X-Mail-SPAM: 15', 'X-Mail-SPAM: 20'] h['To'] = 'bob@you.com' h['To'] #=> 'bob@you.com' h['X-Mail-SPAM'] = '10000' h['X-Mail-SPAM'] # => ['15', '20', '10000'] h['X-Mail-SPAM'] = nil h['X-Mail-SPAM'] # => nil
# File lib/mail/header.rb, line 134 def []=(name, value) name = dasherize(name) selected = select_field_for(name) case # User wants to delete the field when !selected.blank? && value == nil fields.delete_if { |f| selected.include?(f) } # User wants to change the field when !selected.blank? && limited_field?(name) selected.first.update(name, value) # User wants to create the field else # Need to insert in correct order for trace fields self.fields << Field.new(name.to_s, value) end end
# File lib/mail/header.rb, line 172 def decoded raise NoMethodError, 'Can not decode an entire header as there could be character set conflicts, try calling #decoded on the various fields.' end
# File lib/mail/header.rb, line 160 def encoded buffer = '' fields.each do |field| buffer << field.encoded end buffer end
# File lib/mail/header.rb, line 176 def field_summary fields.map { |f| "<#{f.name}: #{f.value}>" }.join(", ") end
Returns an array of all the fields in the header in order that they were read in.
# File lib/mail/header.rb, line 48 def fields @fields ||= FieldList.new end
3.6. Field definitions It is important to note that the header fields are not guaranteed to be in a particular order. They may appear in any order, and they have been known to be reordered occasionally when transported over the Internet. However, for the purposes of this standard, header fields SHOULD NOT be reordered when a message is transported or transformed. More importantly, the trace header fields and resent header fields MUST NOT be reordered, and SHOULD be kept in blocks prepended to the message. See sections 3.6.6 and 3.6.7 for more information.
Populates the fields container with Field objects in the order it receives them in.
Acceps an array of field string values, for example:
h = Header.new h.fields = ['From: mikel@me.com', 'To: bob@you.com']
# File lib/mail/header.rb, line 71 def fields=(unfolded_fields) @fields = Mail::FieldList.new unfolded_fields.each do |field| field = Field.new(field) selected = select_field_for(field.name) if selected.any? && limited_field?(field.name) selected.first.update(field.name, field.value) else @fields << field end end end
Returns true if the header has a Content-ID defined (empty or not)
# File lib/mail/header.rb, line 186 def has_content_id? !fields.select { |f| f.responsible_for?('Content-ID') }.empty? end
Returns true if the header has a Date defined (empty or not)
# File lib/mail/header.rb, line 191 def has_date? !fields.select { |f| f.responsible_for?('Date') }.empty? end
Returns true if the header has a Message-ID defined (empty or not)
# File lib/mail/header.rb, line 181 def has_message_id? !fields.select { |f| f.responsible_for?('Message-ID') }.empty? end
Returns true if the header has a message_id defined (empty or not)
# File lib/mail/header.rb, line 196 def has_mime_version? !fields.select { |f| f.responsible_for?('Mime-Version') }.empty? end
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