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;;; gh-api.el --- api definition for gh.el
;; Copyright (C) 2011 Yann Hodique
;; Author: Yann Hodique <yann.hodique@gmail.com>
;; Keywords:
;; This file 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, or (at your option)
;; any later version.
;; This file 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;
;;; Code:
(eval-when-compile
(require 'cl))
;;;###autoload
(require 'eieio)
(require 'json)
(require 'gh-profile)
(require 'gh-url)
(require 'gh-auth)
(require 'gh-cache)
(require 'logito)
(defgroup gh-api nil
"Github API."
:group 'gh)
(defcustom gh-api-username-filter 'gh-api-enterprise-username-filter
"Filter to apply to usernames to build URL components"
:type 'function
:group 'gh-api)
;;;###autoload
(defclass gh-api ()
((sync :initarg :sync :initform t)
(cache :initarg :cache :initform nil)
(base :initarg :base :type string)
(profile :initarg :profile :type string)
(auth :initarg :auth :initform nil)
(data-format :initarg :data-format)
(num-retries :initarg :num-retries :initform 0)
(log :initarg :log :initform nil)
(cache-cls :initform gh-cache :allocation :class))
"Github API")
(defmethod logito-log ((api gh-api) level tag string &rest objects)
(apply 'logito-log (oref api :log) level tag string objects))
(defmethod initialize-instance ((api gh-api) &rest args)
(call-next-method))
(defmethod gh-api-set-default-auth ((api gh-api) auth)
(let ((auth (or (oref api :auth) auth))
(cache (oref api :cache))
(classname (symbol-name (funcall (if (fboundp 'eieio-object-class)
'eieio-object-class
'object-class)
api))))
(oset api :auth auth)
(unless (or (null cache)
(and (eieio-object-p cache)
(object-of-class-p cache 'gh-cache)))
(oset api :cache (make-instance
(oref api cache-cls)
:object-name
(format "gh/%s/%s"
classname
(gh-api-get-username api)))))))
(defmethod gh-api-expand-resource ((api gh-api)
resource)
resource)
(defun gh-api-enterprise-username-filter (username)
(replace-regexp-in-string (regexp-quote ".") "-" username))
(defmethod gh-api-get-username ((api gh-api))
(let ((username (oref (oref api :auth) :username)))
(funcall gh-api-username-filter username)))
;;;###autoload
(defclass gh-api-v3 (gh-api)
((data-format :initarg :data-format :initform :json))
"Github API v3")
(defcustom gh-api-v3-authenticator 'gh-oauth-authenticator
"Authenticator for Github API v3"
:type '(choice (const :tag "Password" gh-password-authenticator)
(const :tag "OAuth" gh-oauth-authenticator))
:group 'gh-api)
(defmethod initialize-instance ((api gh-api-v3) &rest args)
(call-next-method)
(let ((gh-profile-current-profile (gh-profile-current-profile)))
(oset api :profile (gh-profile-current-profile))
(oset api :base (gh-profile-url))
(gh-api-set-default-auth api
(or (oref api :auth)
(funcall gh-api-v3-authenticator "auth")))))
;;;###autoload
(defclass gh-api-request (gh-url-request)
((default-response-cls :allocation :class :initform gh-api-response)))
;;;###autoload
(defclass gh-api-response (gh-url-response)
())
(defun gh-api-json-decode (repr)
(if (or (null repr) (string= repr ""))
'empty
(let ((json-array-type 'list))
(json-read-from-string repr))))
(defun gh-api-json-encode (json)
(encode-coding-string (json-encode-list json) 'utf-8))
(defmethod gh-url-response-set-data ((resp gh-api-response) data)
(call-next-method resp (gh-api-json-decode data)))
;;;###autoload
(defclass gh-api-paged-request (gh-api-request)
((default-response-cls :allocation :class :initform gh-api-paged-response)
(page-limit :initarg :page-limit :initform -1)))
;;;###autoload
(defclass gh-api-paged-response (gh-api-response)
())
(defmethod gh-api-paging-links ((resp gh-api-paged-response))
(let ((links-header (cdr (assoc "Link" (oref resp :headers)))))
(when links-header
(loop for item in (split-string links-header ", ")
when (string-match "^<\\(.*\\)>; rel=\"\\(.*\\)\"" item)
collect (cons (match-string 2 item)
(match-string 1 item))))))
(defmethod gh-url-response-set-data ((resp gh-api-paged-response) data)
(let ((previous-data (oref resp :data))
(next (cdr (assoc "next" (gh-api-paging-links resp)))))
(call-next-method)
(oset resp :data (append previous-data (oref resp :data)))
(when (and next (not (equal 304 (oref resp :http-status))))
(let* ((req (oref resp :-req))
(last-page-limit (oref req :page-limit))
(this-page-limit (if (numberp last-page-limit) (- last-page-limit 1) -1)))
(oset req :page-limit this-page-limit)
(unless (eq (oref req :page-limit) 0)
;; We use an explicit check for 0 since -1 indicates that
;; paging should continue forever.
(oset resp :data-received nil)
(oset req :url next)
;; Params need to be set to nil because the next uri will
;; already have query params. If params are non-nil this will
;; cause another set of params to be added to the end of the
;; string which will override the params that are set in the
;; next link.
(oset req :query nil)
(gh-url-run-request req resp))))))
(defmethod gh-api-authenticated-request
((api gh-api) transformer method resource &optional data params page-limit)
(let* ((fmt (oref api :data-format))
(headers (cond ((eq fmt :form)
'(("Content-Type" .
"application/x-www-form-urlencoded")))
((eq fmt :json)
'(("Content-Type" .
"application/json")))))
(cache (oref api :cache))
(key (list resource
method
(sha1 (format "%s" transformer))))
(cache-key (and cache
(member method (oref cache safe-methods))
key))
(has-value (and cache-key (pcache-has cache cache-key)))
(value (and has-value (pcache-get cache cache-key)))
(is-outdated (and has-value (gh-cache-outdated-p cache cache-key)))
(etag (and is-outdated (gh-cache-etag cache cache-key)))
(req
(and (or (not has-value)
is-outdated)
(gh-auth-modify-request
(oref api :auth)
;; TODO: use gh-api-paged-request only when needed
(make-instance 'gh-api-paged-request
:method method
:url (concat (oref api :base)
(gh-api-expand-resource
api resource))
:query params
:headers (if etag
(cons (cons "If-None-Match" etag)
headers)
headers)
:data (or (and (eq fmt :json)
(gh-api-json-encode data))
(and (eq fmt :form)
(gh-url-form-encode data))
"")
:page-limit page-limit)))))
(cond ((and has-value ;; got value from cache
(not is-outdated))
(make-instance 'gh-api-response :data-received t :data value))
(cache-key ;; no value, but cache exists and method is safe
(let ((resp (make-instance (oref req default-response-cls)
:transform transformer)))
(gh-url-run-request req resp)
(gh-url-add-response-callback
resp (make-instance 'gh-api-callback :cache cache :key cache-key
:revive etag))
resp))
(cache ;; unsafe method, cache exists
(pcache-invalidate cache key)
(gh-url-run-request req (make-instance
(oref req default-response-cls)
:transform transformer)))
(t ;; no cache involved
(gh-url-run-request req (make-instance
(oref req default-response-cls)
:transform transformer))))))
;;;###autoload
(defclass gh-api-callback (gh-url-callback)
((cache :initarg :cache)
(key :initarg :key)
(revive :initarg :revive)))
(defmethod gh-url-callback-run ((cb gh-api-callback) resp)
(let ((cache (oref cb :cache))
(key (oref cb :key)))
(if (and (oref cb :revive) (equal (oref resp :http-status) 304))
(progn
(gh-cache-revive cache key)
(oset resp :data (pcache-get cache key)))
(pcache-put cache key (oref resp :data))
(gh-cache-set-etag cache key
(cdr (assoc "ETag" (oref resp :headers)))))))
(define-obsolete-function-alias 'gh-api-add-response-callback
'gh-url-add-response-callback "0.6.0")
(provide 'gh-api)
;;; gh-api.el ends here
;; Local Variables:
;; indent-tabs-mode: nil
;; End: