PostgreSQL cURL allows most curl actions, including data transfer with URL syntax via HTTP, HTTPS, FTP, FTPS, GOPHER, TFTP, SCP, SFTP, SMB, TELNET, DICT, LDAP, LDAPS, FILE, IMAP, SMTP, POP3, RTSP and RTMP

http get

CREATE OR REPLACE FUNCTION get(url TEXT) RETURNS TEXT LANGUAGE SQL AS $BODY$
    WITH s AS (SELECT
        curl_easy_reset(),
        curl_easy_setopt_url(url),
        curl_easy_perform(),
        curl_easy_getinfo_data_in()
    ) SELECT convert_from(curl_easy_getinfo_data_in, 'utf-8') FROM s;
$BODY$;

http urlencoded form post

CREATE OR REPLACE FUNCTION post(url TEXT, request JSON) RETURNS TEXT LANGUAGE SQL AS $BODY$
    WITH s AS (SELECT
        curl_easy_reset(),
        ( WITH s AS (
            SELECT (json_each_text(request)).*
        ) SELECT array_agg(curl_postfield_append(key, value)) FROM s),
        curl_easy_setopt_url(url),
        curl_easy_perform(),
        curl_easy_getinfo_data_in()
    ) SELECT convert_from(curl_easy_getinfo_data_in, 'utf-8') FROM s;
$BODY$;

http multipart/form-data form post

CREATE OR REPLACE FUNCTION post(url TEXT, request JSON) RETURNS TEXT LANGUAGE SQL AS $BODY$
    WITH s AS (SELECT
        curl_easy_reset(),
        ( WITH s AS (
            SELECT (json_each_text(request)).*
        ) SELECT array_agg(curl_mime_data(value, name:=key)) FROM s),
        curl_easy_setopt_url(url),
        curl_easy_perform(),
        curl_easy_getinfo_data_in()
    ) SELECT convert_from(curl_easy_getinfo_data_in, 'utf-8') FROM s;
$BODY$;

http json post

CREATE OR REPLACE FUNCTION post(url TEXT, request JSON) RETURNS TEXT LANGUAGE SQL AS $BODY$
    WITH s AS (SELECT
        curl_easy_reset(),
        curl_easy_setopt_postfields(convert_to(request::TEXT, 'utf-8')),
        curl_easy_setopt_url(url),
        curl_header_append('Content-Type', 'application/json; charset=utf-8'),
        curl_easy_perform(),
        curl_easy_getinfo_data_in()
    ) SELECT convert_from(curl_easy_getinfo_data_in, 'utf-8') FROM s;
$BODY$;

email

CREATE OR REPLACE FUNCTION email(url TEXT, username TEXT, password TEXT, subject TEXT, sender TEXT, recipient TEXT, body TEXT, type TEXT) RETURNS TEXT LANGUAGE SQL AS $BODY$
    WITH s AS (SELECT
        curl_easy_reset(),
        curl_easy_setopt_mail_from(sender),
        curl_easy_setopt_password(password),
        curl_easy_setopt_url(url),
        curl_easy_setopt_username(username),
        curl_header_append('From', sender),
        curl_header_append('Subject', subject),
        curl_header_append('To', recipient),
        curl_mime_data(body, type:=type),
        curl_recipient_append(recipient),
        curl_easy_perform(),
        curl_easy_getinfo_header_in()
    ) SELECT curl_easy_getinfo_header_in FROM s;
$BODY$;

convert http headers to table

WITH s AS (
    SELECT regexp_matches(curl_easy_getinfo_header_in(), E'([^ \t\r\n\f]+): ?([^\t\r\n\f]+)', 'g') AS s
) SELECT s[1] AS key, s[2] AS value FROM s;

Goga1992 / pg_curl