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280 | ------------------------------------------------------------------------------
-- G N A T C O L L --
-- --
-- Copyright (C) 2006-2018, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
-- This package contains various utility routines related to handling of
-- email messages
with Ada.Calendar;
with Ada.Containers.Hashed_Sets;
package GNATCOLL.Email.Utils is
type Region is (Addr_Header, Other_Header, Text);
subtype Any_Header is Region range Addr_Header .. Other_Header;
-- Used to indicate where a given character occurs:
-- Addr_Header: From/To/Cc header
-- Header: any other header
-- Text: message body
-----------
-- Dates --
-----------
type Time_Format is (Time_RFC2822, Time_Envelope);
-- The time formats supported by this package.
-- Time_RFC2822 is the one used in the Date: header.
-- Time_Enveloppe is the one used in the From_ header
function To_Time
(Date : String;
Format : Time_Format := Time_RFC2822) return Ada.Calendar.Time;
-- Interprets the Date as a date/time, and returns it. The time is UTC.
-- If Date doesn't match Format, No_Time is returned.
function Format_Date
(Date : Ada.Calendar.Time;
Use_GMT : Boolean := False;
From_Line : Boolean := False;
No_TZ : Boolean := False;
Show_Time : Boolean := True;
Show_Seconds : Boolean := True;
Show_Day : Boolean := True) return String;
-- Format the date as a RFC 2822 string, e.g.:
-- Fri, 09 Nov 2001 01:08:47 -0000
-- If Use_GMT is true, the time stamp is rendered in UTC, and the time zone
-- is shown as "GMT". This is needed for some protocols.
-- If From_Line is True, use the format of standard UNIX mailbox From_
-- lines:
-- Tue Jan 24 14:48:49 2006 +0100
-- If No_TZ is true, then the date is rendered in UTC, and no time zone
-- name is shown.
-- If Show_Seconds is false, then seconds will not be displayed (this can
-- be used to save space, but the output format is not compatible with
-- RFC 2822).
-- If Show_Day is false, the day of week is not displayed. The output is
-- also not compatible with RFC 2822.
function Format_Time (Date : Ada.Calendar.Time) return String;
-- Format the time part of Date, interpreted in UTC, as a RFC2822 string:
-- 01:08:47
---------------
-- Addresses --
---------------
function Hash (Addr : Email_Address) return Ada.Containers.Hash_Type;
package Address_Set is new Ada.Containers.Hashed_Sets
(Email_Address, Hash, "=");
function Quote (Str : String) return String;
-- Return a string which is a quoted version of Str: backslashes have been
-- replaced by \\, and double-quotes by \".
function Unquote (Str : String) return String;
-- Return an unquoted version of Str. Extra Backslashes are removed
function Parse_Address (Email : String) return Email_Address;
-- Split an email address as read from a message header into its
-- constituents
function To_Address
(Address : String;
Real_Name : String := "") return Email_Address;
-- Create an Email_Address from the given parts
function Get_Addresses (Str : String) return Address_Set.Set;
function Get_Addresses
(Str : Charset_String_List.List) return Address_Set.Set;
-- Return the list of addresses in Str.
-- The second version properly preserves real names from extended charsets.
function To_String
(Addresses : Address_Set.Set;
Separator : String := ", ";
Address_Only : Boolean := False;
Charset : String := Charset_US_ASCII) return String;
-- Return the list of addresses as a string compatible with RFC 2822.
-- Parsing this field with Get_Addresses would return the same set of
-- addresses of Separator has its default value.
-- If Address_Only is true, then the real names are never shown in the
-- string.
-- Charset is passed to Format_Address to format individual addresses.
function Get_Recipients
(Msg : Message'Class; Include_From : Boolean := False)
return Address_Set.Set;
function Get_Recipients (H : Header'Class) return Address_Set.Set;
-- Return the list of all recipients of the message. This takes into
-- account all occurrences of all relevant headers.
-- In the first case, Include_From indicates whether the sender of the
-- message should also be returned. For Null_Message, return an empty set.
-- ??? The 2nd function should be renamed to Get_Addresses since it applies
-- to all headers containing addresses, not only those designating
-- message recipients.
function Legacy_Format_Address
(Real : String; Address : String) return String;
-- Format the given email address and real name, using quotes and
-- backslash escaping to protect any special characters occurring in Real.
-- Note: Real should be a US ASCII string.
function Format_Address
(Email : Email_Address;
Charset : String := Charset_US_ASCII) return Charset_String_List.List;
-- Format an email address into a proper format for RFC2822
-- Charset specifies the character set for the real name.
function Format_Address
(Email : Email_Address;
Charset : String := Charset_US_ASCII) return Unbounded_String;
-- Same as above, and return result as an RFC 2047 encoded string
function Domain_From_Address (Email : String) return String;
function Domain_From_Address (Email : Email_Address) return String;
-- Return the domain name for the given Email address. In the first case,
-- Email must only contain the address, not the real name.
-- If no domain is specified, the empty string is returned. Look at
-- GNAT.Socket.Host_Name to fall back on the current host.
function Login_From_Address (Email : String) return String;
function Login_From_Address (Email : Email_Address) return String;
-- Return the login name from the given email address, i.e. the part before
-- the '@'. In the first case, Email must only contain the address, not the
-- real name.
----------
-- Mime --
----------
function Get_Main_Type (MIME_Type : String) return String;
-- Return the main type component of the MIME_Type, for instance "text"
-- when the type is "text/plain";
function Get_Sub_Type (MIME_Type : String) return String;
-- Return the sub type component of the MIME_Type, for instance "plain"
-- when the type is "text/plain";
---------------
-- Encodings --
---------------
procedure Quoted_Printable_Encode
(Str : String;
Charset : String;
Max_Block_Len : Integer := Integer'Last;
Where : Region := Text;
Result : out Unbounded_String);
-- Encode Str in quoted-printable format, as per RFC 2045/2047.
-- This should be used for ASCII-like charsets, like all ISO-8859-*
-- charsets, i.e. when most of the characters are already in the ASCII
-- charset (0 through 127).
procedure Quoted_Printable_Decode
(Str : String;
Result : out Unbounded_String;
Where : Region := Text);
-- Decode Str as a quoted-printable encoded string as per RFC 2045.
-- The returned value may contain non - ASCII characters, their
-- interpretation is left to the called (i.e. the charset is unknown).
-- If the optional argument header is present and true, underscore will be
-- decoded as space. This is used to decode "Q" encoded headers as
-- described in RFC 2047: "MIME (Multipurpose Internet Mail Extensions)
-- Part Three: Message Header Extensions for Non-ASCII Text".
procedure Base64_Encode
(Str : String;
Charset : String;
Max_Block_Len : Integer := Integer'Last;
Where : Region := Text;
Result : out Unbounded_String);
-- Encode Str in base64 format, as defined by RFC 2045.
-- This should be used for charsets that have little similarity with
-- ASCII, for instance Asian charsets.
procedure Base64_Encode
(Str : String;
Charset : String;
Max_Block_Len : Integer := Integer'Last;
Where : Region := Text;
Put_Parts : not null access procedure (Part : String));
-- Encode Str in base64 format like above but returning result part by part
-- over Put_Parts routine to be able to use another kind of output.
procedure Base64_Decode
(Str : String;
Result : out Unbounded_String);
-- Decode Str from a base64 encoding, as defined by RFC 2045
procedure Encode
(Str : String;
Charset : String := Charset_US_ASCII;
Where : Region := Text;
Result : out Unbounded_String);
-- Encode Str in the best encoding to use for Charset. The encoding depends
-- on how close charset is to ASCII.
-- If Header is true, then several encoded blocks will be created as
-- required by RFC 2045 (separated by spaces). In addition, the charset is
-- included as part of the encoded field, as suitable for mail headers.
procedure Decode_Header
(Str : String;
Default_Charset : String := Charset_US_ASCII;
Result : out Charset_String_List.List;
Where : Any_Header := Other_Header);
-- Decode Str. It might contain several mime-encoded sections, with
-- different charsets. Each section is returned separately. For each
-- section, Contents must be interpreted in the context of that charset.
-- When several adjacent sections have the same encoding, they are merged
-- for ease of use.
-- When no charset is specified for a section, the default charset is
-- assumed.
-- This function can also be used for headers, when each section starts
-- with =?charset?q?....?=.
--------------
-- Charsets --
--------------
procedure Flatten
(List : Charset_String_List.List;
Result : out Unbounded_String);
-- Return a flatten version of List, where all sections are concatenated.
-- It will not be possible to go back to List afterward, since the sections
-- are not MIME-encoded, only their contents is taken into account.
-- This should never be used for display to the user, only for internal
-- manipulation when the exact charset of each section is irrelevant.
procedure To_String
(List : Charset_String_List.List;
Result : out Unbounded_String;
Where : Any_Header := Other_Header);
-- Return a single string representing list, where all sections is
-- properly encoded and surrounded by =?charset? markers.
end GNATCOLL.Email.Utils;
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