From 4652c09617588b72ccda83de2ebd07bf81242978 Mon Sep 17 00:00:00 2001
From: "Jakob L. Kreuze" <zerodaysfordays@sdf.lonestar.org>
Date: Sun, 28 Apr 2019 11:19:23 -0400
Subject: Generate headers for 'post-article

---
 brisket.hy | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 57 insertions(+), 12 deletions(-)

diff --git a/brisket.hy b/brisket.hy
index f42db86..1b88e76 100644
--- a/brisket.hy
+++ b/brisket.hy
@@ -22,12 +22,14 @@
 (setv __license__ "GPL")
 (setv __version__ "0.1.0 'Kansas City-style'")
 
+(import [binascii [hexlify]])
 (import [configparser [ConfigParser]])
+(import [nntplib [NNTP-SSL]])
 (import [os [getcwd getenv makedirs]])
 (import [os.path [dirname expanduser join]])
-(import [sys [argv exit stderr stdin]])
-(import [nntplib [NNTP-SSL]])
 (import [subprocess [Popen PIPE]])
+(import [sys [argv exit stderr stdin]])
+(import [time [strftime]])
 
 (require [hy.contrib.walk [let]])
 
@@ -165,22 +167,65 @@ usage: fetch-posts (group [optional]) (article-id [optional])"
           [group (fetch-group-articles session dest write-to-stdout group)]
           [True (fetch-all-articles session dest write-to-stdout)])))
 
+;; RFC 5536, the Netnews Article Format specifies the following headers as
+;; mandatory an article.
+;;
+;; - Date
+;; - From
+;; - Message-ID
+;; - Newsgroups
+;; - Path
+;; - Subject
+;;
+;; The following headers, though not mandatory, are handled as well by brisket.
+;;
+;; - User-Agent
+;; - Mime-Version
+;; - Content-Type
+;; - Content-Transfer-Encoding
+;; - Content-Language
+
+(defn generate-message-id [posting-address]
+  (let [random (with [rand (open "/dev/urandom" "rb")]
+                 (hexlify (.read rand 16)))
+        host (second (.split posting-address "@"))]
+    (.format "<brisket-{}@{}>" random host)))
+
+(defn generate-headers [posting-address subject group]
+  "Return a list of headers to prepend to an article."
+  [(.format "Date: {}" (strftime "%a, %d %b %Y %H:%M:%S %z"))
+   (.format "From: {}" posting-address)
+   (.format "Message-ID: {}" (generate-message-id posting-address))
+   (.format "Newsgroups: {}" group)
+   (.format "Path: {}" "not-for-mail")
+   (.format "Subject: {}" subject)
+   (.format "User-Agent: {} {}" "brisket" __version__)
+   (.format "Mime-Version: {}" "1.0")
+   (.format "Content-Type: {}" "text/plain; charset=utf-8")
+   (.format "Content-Transfer-Encoding: {}" "7bit")
+   (.format "Content-Language: {}" "en-US")])
+
 (defn post-article [session &rest args]
   "Post an article to the server.
 
 Reads from stdin if the path of a file is not specified.
 
-usage: post-article [group] (path [optional])"
-  (when (= (len args) 0)
-    (err "usage: post-article [group] (path [optional])")
+usage: post-article [posting-address] [subject] [group] (path [optional])"
+  (when (< (len args) 3)
+    (err "usage: post-article [posting-address] [subject] [group] (path [optional])")
     (return))
-  (let [group (first args)
-        path (if (> (len args) 1) (second args))]
-    (.group session group)
-    (if path
-        (with [f (open path "rb")]
-          (.post session))
-        (.post session (list (map str.encode (.split (.read stdin) "\n")))))))
+  (let [posting-address (nth args 0)
+        subject (nth args 1)
+        group (nth args 2)
+        headers (generate-headers posting-address subject group)
+        path (if (> (len args) 3) (nth args 3))
+        content (if path
+                    (with [f (open path)]
+                      (+ (list (map str.encode headers))
+                         (list (map str.encode (.split (.read f) "\n")))))
+                    (+ (list (map str.encode headers))
+                       (list (map str.encode (.split (.read stdin) "\n")))))]
+    (.post session content)))
 
 (defn make-config []
   "Create a default configuration file.
-- 
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