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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-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)))
+	(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.