CREATE OR REPLACE PACKAGE demo_mail IS

----------------------- Customizable Section -----------------------

-- Customize the SMTP host, port and your domain name below.
smtp_host VARCHAR2(256) := 'smtp.eygle.com';
smtp_port PLS_INTEGER := 25;
smtp_domain VARCHAR2(256) := 'eygle.com';

-- Customize the signature that will appear in the email's MIME header.
-- Useful for versioning.
MAILER_ID CONSTANT VARCHAR2(256) := 'Mailer by Eygle';

--------------------- End Customizable Section ---------------------

-- A unique string that demarcates boundaries of parts in a multi-part email
-- The string should not appear inside the body of any part of the email.
-- Customize this if needed or generate this randomly dynamically.
BOUNDARY CONSTANT VARCHAR2(256) := '-----7D81B75CCC90D2974F7A1CBD';

FIRST_BOUNDARY CONSTANT VARCHAR2(256) := '--' || BOUNDARY || utl_tcp.CRLF;
LAST_BOUNDARY CONSTANT VARCHAR2(256) := '--' || BOUNDARY || '--' ||
utl_tcp.CRLF;

-- A MIME type that denotes multi-part email (MIME) messages.
MULTIPART_MIME_TYPE CONSTANT VARCHAR2(256) := 'multipart/mixed; boundary="'||
BOUNDARY || '"';
MAX_BASE64_LINE_WIDTH CONSTANT PLS_INTEGER := 76 / 4 * 3;

-- A simple email API for sending email in plain text in a single call.
-- The format of an email address is one of these:
-- someone@some-domain
-- "Someone at some domain" <someone@some-domain>
-- Someone at some domain <someone@some-domain>
-- The recipients is a list of email addresses separated by
-- either a "," or a ";"
PROCEDURE mail(sender IN VARCHAR2,
recipients IN VARCHAR2,
subject IN VARCHAR2,
message IN VARCHAR2);

-- Extended email API to send email in HTML or plain text with no size limit.
-- First, begin the email by begin_mail(). Then, call write_text() repeatedly
-- to send email in ASCII piece-by-piece. Or, call write_mb_text() to send
-- email in non-ASCII or multi-byte character set. End the email with
-- end_mail().
FUNCTION begin_mail(sender IN VARCHAR2,
recipients IN VARCHAR2,
subject IN VARCHAR2,
mime_type IN VARCHAR2 DEFAULT 'text/plain',
priority IN PLS_INTEGER DEFAULT NULL)
RETURN utl_smtp.connection;

-- Write email body in ASCII
PROCEDURE write_text(conn IN OUT NOCOPY utl_smtp.connection,
message IN VARCHAR2);

-- Write email body in non-ASCII (including multi-byte). The email body
-- will be sent in the database character set.
PROCEDURE write_mb_text(conn IN OUT NOCOPY utl_smtp.connection,
message IN VARCHAR2);

-- Write email body in binary
PROCEDURE write_raw(conn IN OUT NOCOPY utl_smtp.connection,
message IN RAW);

-- APIs to send email with attachments. Attachments are sent by sending
-- emails in "multipart/mixed" MIME format. Specify that MIME format when
-- beginning an email with begin_mail().

-- Send a single text attachment.
PROCEDURE attach_text(conn IN OUT NOCOPY utl_smtp.connection,
data IN VARCHAR2,
mime_type IN VARCHAR2 DEFAULT 'text/plain',
inline IN BOOLEAN DEFAULT TRUE,
filename IN VARCHAR2 DEFAULT NULL,
last IN BOOLEAN DEFAULT FALSE);

-- Send a binary attachment. The attachment will be encoded in Base-64
-- encoding format.
PROCEDURE attach_base64(conn IN OUT NOCOPY utl_smtp.connection,
data IN RAW,
mime_type IN VARCHAR2 DEFAULT 'application/octet',
inline IN BOOLEAN DEFAULT TRUE,
filename IN VARCHAR2 DEFAULT NULL,
last IN BOOLEAN DEFAULT FALSE);

-- Send an attachment with no size limit. First, begin the attachment
-- with begin_attachment(). Then, call write_text repeatedly to send
-- the attachment piece-by-piece. If the attachment is text-based but
-- in non-ASCII or multi-byte character set, use write_mb_text() instead.
-- To send binary attachment, the binary content should first be
-- encoded in Base-64 encoding format using the demo package for 8i,
-- or the native one in 9i. End the attachment with end_attachment.
PROCEDURE begin_attachment(conn IN OUT NOCOPY utl_smtp.connection,
mime_type IN VARCHAR2 DEFAULT 'text/plain',
inline IN BOOLEAN DEFAULT TRUE,
filename IN VARCHAR2 DEFAULT NULL,
transfer_enc IN VARCHAR2 DEFAULT NULL);

-- End the attachment.
PROCEDURE end_attachment(conn IN OUT NOCOPY utl_smtp.connection,
last IN BOOLEAN DEFAULT FALSE);

-- End the email.
PROCEDURE end_mail(conn IN OUT NOCOPY utl_smtp.connection);

-- Extended email API to send multiple emails in a session for better
-- performance. First, begin an email session with begin_session.
-- Then, begin each email with a session by calling begin_mail_in_session
-- instead of begin_mail. End the email with end_mail_in_session instead
-- of end_mail. End the email session by end_session.
FUNCTION begin_session RETURN utl_smtp.connection;

-- Begin an email in a session.
PROCEDURE begin_mail_in_session(conn IN OUT NOCOPY utl_smtp.connection,
sender IN VARCHAR2,
recipients IN VARCHAR2,
subject IN VARCHAR2,
mime_type IN VARCHAR2 DEFAULT 'text/plain',
priority IN PLS_INTEGER DEFAULT NULL);

-- End an email in a session.
PROCEDURE end_mail_in_session(conn IN OUT NOCOPY utl_smtp.connection);

-- End an email session.
PROCEDURE end_session(conn IN OUT NOCOPY utl_smtp.connection);

END;
/
CREATE OR REPLACE PACKAGE BODY demo_mail IS

-- Return the next email address in the list of email addresses, separated
-- by either a "," or a ";". The format of mailbox may be in one of these:
-- someone@some-domain
-- "Someone at some domain" <someone@some-domain>
-- Someone at some domain <someone@some-domain>
FUNCTION get_address(addr_list IN OUT VARCHAR2) RETURN VARCHAR2 IS

addr VARCHAR2(256);
i pls_integer;

FUNCTION lookup_unquoted_char(str IN VARCHAR2,
chrs IN VARCHAR2) RETURN pls_integer AS
c VARCHAR2(5);
i pls_integer;
len pls_integer;
inside_quote BOOLEAN;
BEGIN
inside_quote := false;
i := 1;
len := length(str);
WHILE (i <= len) LOOP

c := substr(str, i, 1);

IF (inside_quote) THEN
IF (c = '"') THEN
inside_quote := false;
ELSIF (c = '\') THEN
i := i + 1; -- Skip the quote character
END IF;
GOTO next_char;
END IF;

IF (c = '"') THEN
inside_quote := true;
GOTO next_char;
END IF;

IF (instr(chrs, c) >= 1) THEN
RETURN i;
END IF;

<<next_char>>
i := i + 1;

END LOOP;

RETURN 0;

END;

BEGIN

addr_list := ltrim(addr_list);
i := lookup_unquoted_char(addr_list, ',;');
IF (i >= 1) THEN
addr := substr(addr_list, 1, i - 1);
addr_list := substr(addr_list, i + 1);
ELSE
addr := addr_list;
addr_list := '';
END IF;

i := lookup_unquoted_char(addr, '<');
IF (i >= 1) THEN
addr := substr(addr, i + 1);
i := instr(addr, '>');
IF (i >= 1) THEN
addr := substr(addr, 1, i - 1);
END IF;
END IF;

RETURN addr;
END;

-- Write a MIME header
PROCEDURE write_mime_header(conn IN OUT NOCOPY utl_smtp.connection,
name IN VARCHAR2,
value IN VARCHAR2) IS
BEGIN
utl_smtp.write_data(conn, name || ': ' || value || utl_tcp.CRLF);
END;

-- Mark a message-part boundary. Set <last> to TRUE for the last boundary.
PROCEDURE write_boundary(conn IN OUT NOCOPY utl_smtp.connection,
last IN BOOLEAN DEFAULT FALSE) AS
BEGIN
IF (last) THEN
utl_smtp.write_data(conn, LAST_BOUNDARY);
ELSE
utl_smtp.write_data(conn, FIRST_BOUNDARY);
END IF;
END;

------------------------------------------------------------------------
PROCEDURE mail(sender IN VARCHAR2,
recipients IN VARCHAR2,
subject IN VARCHAR2,
message IN VARCHAR2) IS
conn utl_smtp.connection;
BEGIN
conn := begin_mail(sender, recipients, subject);
write_text(conn, message);
end_mail(conn);
END;

------------------------------------------------------------------------
FUNCTION begin_mail(sender IN VARCHAR2,
recipients IN VARCHAR2,
subject IN VARCHAR2,
mime_type IN VARCHAR2 DEFAULT 'text/plain',
priority IN PLS_INTEGER DEFAULT NULL)
RETURN utl_smtp.connection IS
conn utl_smtp.connection;
BEGIN
conn := begin_session;
begin_mail_in_session(conn, sender, recipients, subject, mime_type,
priority);
RETURN conn;
END;

------------------------------------------------------------------------
PROCEDURE write_text(conn IN OUT NOCOPY utl_smtp.connection,
message IN VARCHAR2) IS
BEGIN
utl_smtp.write_data(conn, message);
END;

------------------------------------------------------------------------
PROCEDURE write_mb_text(conn IN OUT NOCOPY utl_smtp.connection,
message IN VARCHAR2) IS
BEGIN
utl_smtp.write_raw_data(conn, utl_raw.cast_to_raw(message));
END;

------------------------------------------------------------------------
PROCEDURE write_raw(conn IN OUT NOCOPY utl_smtp.connection,
message IN RAW) IS
BEGIN
utl_smtp.write_raw_data(conn, message);
END;

------------------------------------------------------------------------
PROCEDURE attach_text(conn IN OUT NOCOPY utl_smtp.connection,
data IN VARCHAR2,
mime_type IN VARCHAR2 DEFAULT 'text/plain',
inline IN BOOLEAN DEFAULT TRUE,
filename IN VARCHAR2 DEFAULT NULL,
last IN BOOLEAN DEFAULT FALSE) IS
BEGIN
begin_attachment(conn, mime_type, inline, filename);
write_text(conn, data);
end_attachment(conn, last);
END;

------------------------------------------------------------------------
PROCEDURE attach_base64(conn IN OUT NOCOPY utl_smtp.connection,
data IN RAW,
mime_type IN VARCHAR2 DEFAULT 'application/octet',
inline IN BOOLEAN DEFAULT TRUE,
filename IN VARCHAR2 DEFAULT NULL,
last IN BOOLEAN DEFAULT FALSE) IS
i PLS_INTEGER;
len PLS_INTEGER;
BEGIN

begin_attachment(conn, mime_type, inline, filename, 'base64');

-- Split the Base64-encoded attachment into multiple lines
i := 1;
len := utl_raw.length(data);
WHILE (i < len) LOOP
IF (i + MAX_BASE64_LINE_WIDTH < len) THEN
utl_smtp.write_raw_data(conn,
utl_encode.base64_encode(utl_raw.substr(data, i,
MAX_BASE64_LINE_WIDTH)));
ELSE
utl_smtp.write_raw_data(conn,
utl_encode.base64_encode(utl_raw.substr(data, i)));
END IF;
utl_smtp.write_data(conn, utl_tcp.CRLF);
i := i + MAX_BASE64_LINE_WIDTH;
END LOOP;

end_attachment(conn, last);

END;

------------------------------------------------------------------------
PROCEDURE begin_attachment(conn IN OUT NOCOPY utl_smtp.connection,
mime_type IN VARCHAR2 DEFAULT 'text/plain',
inline IN BOOLEAN DEFAULT TRUE,
filename IN VARCHAR2 DEFAULT NULL,
transfer_enc IN VARCHAR2 DEFAULT NULL) IS
BEGIN
write_boundary(conn);
write_mime_header(conn, 'Content-Type', mime_type);

IF (filename IS NOT NULL) THEN
IF (inline) THEN
write_mime_header(conn, 'Content-Disposition',
'inline; filename="'||filename||'"');
ELSE
write_mime_header(conn, 'Content-Disposition',
'attachment; filename="'||filename||'"');
END IF;
END IF;

IF (transfer_enc IS NOT NULL) THEN
write_mime_header(conn, 'Content-Transfer-Encoding', transfer_enc);
END IF;

utl_smtp.write_data(conn, utl_tcp.CRLF);
END;

------------------------------------------------------------------------
PROCEDURE end_attachment(conn IN OUT NOCOPY utl_smtp.connection,
last IN BOOLEAN DEFAULT FALSE) IS
BEGIN
utl_smtp.write_data(conn, utl_tcp.CRLF);
IF (last) THEN
write_boundary(conn, last);
END IF;
END;

------------------------------------------------------------------------
PROCEDURE end_mail(conn IN OUT NOCOPY utl_smtp.connection) IS
BEGIN
end_mail_in_session(conn);
end_session(conn);
END;

------------------------------------------------------------------------
FUNCTION begin_session RETURN utl_smtp.connection IS
conn utl_smtp.connection;
BEGIN
-- open SMTP connection
conn := utl_smtp.open_connection(smtp_host, smtp_port);
utl_smtp.helo(conn, smtp_domain);
RETURN conn;
END;

------------------------------------------------------------------------
PROCEDURE begin_mail_in_session(conn IN OUT NOCOPY utl_smtp.connection,
sender IN VARCHAR2,
recipients IN VARCHAR2,
subject IN VARCHAR2,
mime_type IN VARCHAR2 DEFAULT 'text/plain',
priority IN PLS_INTEGER DEFAULT NULL) IS
my_recipients VARCHAR2(32767) := recipients;
my_sender VARCHAR2(32767) := sender;
BEGIN

-- Specify sender's address (our server allows bogus address
-- as long as it is a full email address (xxx@yyy.com).
utl_smtp.mail(conn, get_address(my_sender));

-- Specify recipient(s) of the email.
WHILE (my_recipients IS NOT NULL) LOOP
utl_smtp.rcpt(conn, get_address(my_recipients));
END LOOP;

-- Start body of email
utl_smtp.open_data(conn);

-- Set "From" MIME header
write_mime_header(conn, 'From', sender);

-- Set "To" MIME header
write_mime_header(conn, 'To', recipients);

-- Set "Subject" MIME header
write_mime_header(conn, 'Subject', subject);

-- Set "Content-Type" MIME header
write_mime_header(conn, 'Content-Type', mime_type);

-- Set "X-Mailer" MIME header
write_mime_header(conn, 'X-Mailer', MAILER_ID);

-- Set priority:
-- High Normal Low
-- 1 2 3 4 5
IF (priority IS NOT NULL) THEN
write_mime_header(conn, 'X-Priority', priority);
END IF;

-- Send an empty line to denotes end of MIME headers and
-- beginning of message body.
utl_smtp.write_data(conn, utl_tcp.CRLF);

IF (mime_type LIKE 'multipart/mixed%') THEN
write_text(conn, 'This is a multi-part message in MIME format.' ||
utl_tcp.crlf);
END IF;

END;

------------------------------------------------------------------------
PROCEDURE end_mail_in_session(conn IN OUT NOCOPY utl_smtp.connection) IS
BEGIN
utl_smtp.close_data(conn);
END;

------------------------------------------------------------------------
PROCEDURE end_session(conn IN OUT NOCOPY utl_smtp.connection) IS
BEGIN
utl_smtp.quit(conn);
END;

END;
/

CREATE OR REPLACE procedure MailTest IS
Begin
DEMO_MAIL.mail('eygle@itpub.net',
'gqgai@hurray.com.cn',
'Just a test',
'It is ok.');
end;
/

begin
MailTest;
end;