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;;; mastodon-http.el --- HTTP request/response functions for mastodon.el
;;; Commentary:
;; mastodon.el is an Emacs client for Mastodon, the federated microblogging
;; social network. It is very much a work-in-progress, but it is a labor of
;; love.
;; mastodon-http.el provides HTTP request/response functions.
;;; Code:
(require 'mastodon)
(require 'json)
(defgroup mastodon-http nil
"HTTP requests and responses for Mastodon."
:prefix "mastodon-http-"
:group 'mastodon)
(defun mastodon--api-for (endpoint)
"Return Mastondon API URL for ENDPOINT."
(concat mastodon-instance-url "/api/" mastodon--api-version "/" endpoint))
(defun mastodon--http-post (url callback args &optional headers)
"Make POST request to URL.
Response buffer is passed to CALLBACK function.
ARGS and HEADERS alist arguments are part of the POST request."
(let ((url-request-method "POST")
(url-request-extra-headers
(append '(("Content-Type" . "application/x-www-form-urlencoded")) headers))
(url-request-data
(mapconcat (lambda (arg)
(concat (url-hexify-string (car arg))
"="
(url-hexify-string (cdr arg))))
args
"&")))
(url-retrieve url callback)))
(defun mastodon--response-buffer ()
"Capture response buffer content as string."
(with-current-buffer (current-buffer)
(buffer-substring-no-properties (point-min) (point-max))))
(defun mastodon--response-body-substring (pattern)
"Return substring matching PATTERN from `mastodon--response-buffer'."
(let ((resp (mastodon--response-buffer)))
(progn
(string-match pattern resp)
(match-string 0 resp))))
(defun mastodon--response-match-p (pattern)
"Return non-nil if `mastodon--response-buffer' matches PATTERN."
(let ((resp (mastodon--response-buffer)))
(string-match-p pattern resp)))
(defun mastodon--response-status-p ()
"Return non-nil if `mastodon--response-buffer' has an HTTP Response Status-Line."
(when (mastodon--response-match-p "^HTTP/1.*$") t))
(defun mastodon--response-json ()
"Return string of JSON response body from `mastodon--response-buffer'."
(mastodon--response-body-substring "\{.*\}"))
(defun mastodon--response-code ()
"Return HTTP Response Status Code from `mastodon--response-buffer'."
(let* ((status-line (mastodon--response-body-substring "^HTTP/1.*$")))
(progn
(string-match "[0-9][0-9][0-9]" status-line)
(match-string 0 status-line))))
(defun mastodon--json-hash-table ()
"Read JSON from `mastodon--response-json' into a hash table."
(let ((json-object-type 'hash-table)
(json-array-type 'list)
(json-key-type 'string))
(json-read-from-string (mastodon--response-json))))
(defun mastodon--http-response-triage (status success)
"Callback function to triage an HTTP response.
Recursively waits for `mastodon--response-buffer' to contain a Status-Line.
STATUS is passed by `url-retrieve'.
SUCCESS is a function called on a 2XX level response code.
If response code is not 2XX, switches to the response buffer created by `url-retrieve'."
(when (not (mastodon--response-status-p))
(mastodon--http-response-triage status))
(if (string-prefix-p "2" (mastodon--response-code))
(funcall success)
(switch-to-buffer (current-buffer))))
(provide 'mastodon-http)
;;; mastodon-http.el ends here
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