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;;; rt-liberation-rest.el --- Interface to the RT REST API
;; Copyright (C) 2014 Yoni Rabkin
;;
;; Authors: Yoni Rabkin <yrk@gnu.org>
;;
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2 of the
;; License, or (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public
;; License along with this program; if not, write to the Free
;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
;; MA 02111-1307, USA.
;;
;; Note: Licensed under GPLv2+ and not GPLv3+ in order to be
;; compatible with the license of RT.
;;; History:
;;
;; Started in May of 2014 in order to remove rt-liberation's
;; dependency on a local copy of the RT CLI.
;;; Code:
(require 'url)
(require 'url-util)
(defvar rt-liber-rest-debug ""
"Debug capture of last HTTP call.")
(defvar rt-liber-rest-scheme "https"
"Scheme used for transport. Is one of http or https.")
(defvar rt-liber-rest-url ""
"URL of RT installation.")
(defvar rt-liber-rest-username ""
"Username of RT account.")
(defvar rt-liber-rest-password ""
"Password of RT account.")
(defun rt-liber-rest-search-string (scheme url username password query)
""
(let ((user (url-encode-url username))
(pass (url-encode-url password)))
(concat scheme
"://"
url
"/REST/1.0/search/ticket" "?"
"user=" user "&"
"pass=" pass "&"
"query=" (url-encode-url query) "&"
"format=i" "&"
"orderby=+Created")))
(defun rt-liber-rest-show-string (scheme url ticket-id-list username password query)
""
(let ((user (url-encode-url username))
(pass (url-encode-url password)))
(concat scheme
"://"
url
"/REST/1.0/ticket/" ticket-id-list
"/show" "?"
"user=" user "&"
"pass=" pass "&")))
(defun rt-liber-rest-call (url)
""
(let ((url-request-method "POST"))
(let ((response
(url-retrieve-synchronously url))
str)
(setq str
(with-current-buffer response
(buffer-substring-no-properties (point-min)
(point-max))))
(setq rt-liber-rest-debug str)
str)))
(defun rt-liber-rest-query-runner (op query-string)
(message "starting REST '%s' query at %s..." op (current-time-string))
(when (or (not (stringp op))
(not (stringp query-string)))
(error "bad arguments"))
(cond ((string= op "ls")
(rt-liber-rest-call
(rt-liber-rest-search-string rt-liber-rest-scheme
rt-liber-rest-url
rt-liber-rest-username
rt-liber-rest-password
query-string)))
;; The "show" API call doesn't support getting multiple
;; tickets at once. This is a problem. I've emailed the
;; rt-users mailing list asking how to to this.
;;
;; A much more insidious method to figure this out is to
;; wireshark the CLI connection as it asks for multiple
;; tickets and see if we can capture the query the CLI
;; uses. This would necessitate a non-HTTPS connection, such
;; that the one to the demo servers.
((string= op "show")
(rt-liber-rest-show-string rt-liber-rest-scheme
rt-liber-rest-url
query-string
rt-liber-rest-username
rt-liber-rest-password
query-string))
(t (error "unknown op [%s]" op))))
(defun rt-liber-rest-parse-http-header ()
"Parse the HTTP header from the server."
(let ((http-ok-regexp "^HTTP.*200 OK$")
(rt-ok-regexp "^rt/.*200 ok$"))
(condition-case excep
(progn
(re-search-forward http-ok-regexp (point-max))
(re-search-forward rt-ok-regexp (point-max)))
(error "bad HTTP response from server"))))
(defun rt-liber-rest-ticketsql-runner-parser-f ()
"Parser function for a textual list of tickets."
(let (idsub-list)
(rt-liber-rest-parse-http-header)
(while (re-search-forward "ticket/\\([0-9].+\\)" (point-max) t)
;; the output should be compatible with the input to
;; `rt-liber-create-tickets-string'
(push (list (match-string-no-properties 1)
".")
idsub-list))
idsub-list))
(defun rt-liber-rest-run-ls-query (query)
"Run an \"ls\" type query against the server with QUERY."
(rt-liber-parse-answer
(rt-liber-rest-query-runner "ls" query)
'rt-liber-rest-ticketsql-runner-parser-f))
(provide 'rt-liber-rest)
;;; rt-liberation-rest.el ends here.
|
