Class: Imap::Backup::Account::Folder

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
RetryOnError
Defined in:
lib/imap/backup/account/folder.rb

Constant Summary collapse

BODY_ATTRIBUTE = 
"BODY[]".freeze
UID_FETCH_RETRY_CLASSES = 
[::EOFError, ::Errno::ECONNRESET, ::IOError].freeze
APPEND_RETRY_CLASSES = 
[::Net::IMAP::BadResponseError].freeze
CREATE_RETRY_CLASSES = 
[::Net::IMAP::BadResponseError].freeze
EXAMINE_RETRY_CLASSES = 
[::Net::IMAP::BadResponseError].freeze
PERMITTED_FLAGS = 
%i(Answered Draft Flagged Seen).freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from RetryOnError

#retry_on_error

Constructor Details

#initialize(client, name) ⇒ Folder

Returns a new instance of Folder.



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# File 'lib/imap/backup/account/folder.rb', line 27

def initialize(client, name)
  @client = client
  @name = name
  @uid_validity = nil
end

Instance Attribute Details

#client ⇒ Object (readonly)

Returns the value of attribute client.



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# File 'lib/imap/backup/account/folder.rb', line 24

def client
  @client
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/imap/backup/account/folder.rb', line 25

def name
  @name
end

Instance Method Details

#add_flags(uids, flags) ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 117

def add_flags(uids, flags)
  # Use read-write access, via `select`
  client.select(utf7_encoded_name)
  flags.reject! { |f| f == :Recent }
  client.uid_store(uids, "+FLAGS", flags)
end

#append(message) ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 96

def append(message)
  body = message.imap_body
  date = message.date&.to_time
  flags = message.flags & PERMITTED_FLAGS
  retry_on_error(errors: APPEND_RETRY_CLASSES, limit: 3) do
    response = client.append(utf7_encoded_name, body, flags, date)
    extract_uid(response)
  end
end

#clear ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 129

def clear
  existing = uids
  return if existing.empty?

  add_flags(existing, [:Deleted])
  client.expunge
end

#create ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 42

def create
  return if exist?

  retry_on_error(errors: CREATE_RETRY_CLASSES) do
    client.create(utf7_encoded_name)
  end
end

#delete_multi(uids) ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 106

def delete_multi(uids)
  add_flags(uids, [:Deleted])
  client.expunge
end

#exist? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/imap/backup/account/folder.rb', line 33

def exist?
  retry_on_error(errors: EXAMINE_RETRY_CLASSES) do
    examine
  end
  true
rescue FolderNotFound
  false
end

#fetch_multi(uids, attr = [BODY_ATTRIBUTE, "FLAGS"]) ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 75

def fetch_multi(uids, attr = [BODY_ATTRIBUTE, "FLAGS"])
  examine
  fetch_data_items =
    retry_on_error(errors: UID_FETCH_RETRY_CLASSES) do
      client.uid_fetch(uids, attr)
    end
  return nil if fetch_data_items.nil?

  fetch_data_items.map do |item|
    attributes = item.attr

    {
      uid: attributes["UID"],
      body: attributes[BODY_ATTRIBUTE],
      flags: attributes["FLAGS"]
    }
  end
rescue FolderNotFound
  nil
end

#remove_flags(uids, flags) ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 124

def remove_flags(uids, flags)
  client.select(utf7_encoded_name)
  client.uid_store(uids, "-FLAGS", flags)
end

#set_flags(uids, flags) ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 111

def set_flags(uids, flags)
  client.select(utf7_encoded_name)
  flags.reject! { |f| f == :Recent }
  client.uid_store(uids, "FLAGS", flags)
end

#uid_validity ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 50

def uid_validity
  @uid_validity ||=
    begin
      examine
      client.responses["UIDVALIDITY"][-1]
    end
end

#uids ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 58

def uids
  examine
  client.uid_search(["ALL"]).sort
rescue FolderNotFound
  []
rescue NoMethodError
  message =
    "Folder '#{name}' caused a NoMethodError. " \
    "Probably this was `undefined method `[]' for nil:NilClass (NoMethodError)` " \
    "in `search_internal` in stdlib net/imap.rb. " \
    'This is caused by `@responses["SEARCH"] being unset/undefined. ' \
    "Among others, Apple Mail servers send empty responses when " \
    "folders are empty, causing this error."
  Logger.logger.warn message
  []
end

#unseen(uids) ⇒ Object 



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# File 'lib/imap/backup/account/folder.rb', line 137

def unseen(uids)
  messages = uids.map(&:to_s).join(",")
  examine
  client.uid_search([messages, "UNSEEN"])
rescue NoMethodError
  # Apple Mail returns an empty response when searches have no results
  []
rescue FolderNotFound
  nil
end