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authorChristopher Brannon <chris@the-brannons.com>2021-03-29 05:51:29 -0700
committerChristopher Brannon <chris@the-brannons.com>2021-03-31 03:47:45 -0700
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+ GNU AFFERO GENERAL PUBLIC LICENSE
+ Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+ Preamble
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+
+ THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published by
+ the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source. For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code. There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..de378c2
--- /dev/null
+++ b/README.md
@@ -0,0 +1,70 @@
+# NAWP (NAWP Ain't WordPress) -- Minimal Blogging Engine in Chicken Scheme
+
+This is very much a work in progress, and not everything is guaranteed
+to work just now.
+
+NAWP stores content in an sqlite database. It is dynamic, not a static
+site generator. It is supposed to run as a CGI script.
+
+Here is a list of the external Scheme libraries ("eggs" in Chicken Scheme parlance) that NAWP needs:
+
+* anaphora
+* atom
+* crypt
+* lowdown
+* matchable
+* rfc3339
+* sql-de-lite
+* srfi-1
+* srfi-13
+* sxml-transforms
+* uri-common
+
+I had some problems installing crypt locally; I need to report that upstream.
+
+You'll also need a CGI-capable web server. I use lighttpd with mod_cgi
+enabled.
+
+Once the dependencies are installed, run:
+```csc nawp.scm```
+
+Copy the resulting binary to your cgi-bin directory.
+
+Next, make the database:
+```sqlite3 /var/lib/nawp/blog.db < schema.sql```
+
+Make it readable and writable by the user the CGI script will run as.
+
+Add a new user.
+Run the script as the owner of the DB, with the adduser argument.
+For instance, to add a user named `chris`:
+
+ doas -u dbowner /path/to/nawp adduser chris 'Chris Brannon'
+
+You'll be prompted for the password. Unfortunately it'll echo to stdout
+for now. Fixing that is going to require a little yak-shaving.
+Finally, you'll want to do some web server configuration. TODO.
+
+## Contributing
+
+To contribute, you can push to branches in this repository that have names
+starting with `patch_`. I borrowed this idea from Tim Vaughan, author
+of `elpher` et al. The difference is that Tim Vaughan uses the `git://`
+protocol, where I use `https://`.
+
+## Roadmap
+
+I plan on adding an API. It will probably be the metaweblog XML-RPC
+API used by WordPress, or a slimmed-down version thereof. There are
+command-line tools for blogging with WordPress, and it would be nice to
+be able to use those with NAWP.
+
+I may add Gemini support. I haven't quite decided how I feel about Gemini.
+At first blush, it seems quite compelling and worth the effort.
+
+I may add support for alternative input formats like asciidoc.
+More likely, I'd consider replacing markdown with asciidoc and sticking
+to one single input format.
+Markdown is useful, but it is also poorly specified -- excepting CommonMark -- and underpowered.
+
+Idle speculation: I wonder how hard it would be to add SXML as an output format to pandoc...
diff --git a/nawp.scm b/nawp.scm
new file mode 100755
index 0000000..5da4456
--- /dev/null
+++ b/nawp.scm
@@ -0,0 +1,347 @@
+#!/usr/bin/csi -s
+;;; NAWP (NAWP Ain't WordPress)
+;;; Copyright (C) 2021 Chris Brannon.
+;;;
+;;; This program is free software: you can redistribute it and/or modify
+;;; it under the terms of the GNU Affero General Public License as
+;;; published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU Affero General Public License
+;;; along with this program. If not, see <https://www.gnu.org/licenses/>.
+;;;
+;;; Author's email: chris@the-brannons.com
+;;;
+(import
+ anaphora
+ atom
+ (chicken format)
+ (chicken io)
+ (chicken pathname)
+ (chicken port)
+ (chicken process-context)
+ (chicken time)
+ (chicken time posix)
+ crypt
+ lowdown
+ matchable
+ rfc3339
+ sql-de-lite
+ srfi-1
+ srfi-13
+ sxml-transforms
+ uri-common)
+
+(define-anaphor avalues values #:cascade)
+
+(define blog-title "Brannon's Banal Babblings")
+(define blog-description "Insert clever description.")
+(define atom-page-name "feed.atom")
+(define blog-base-uri (uri-reference "https://the-brannons.com/blog/"))
+(define posts-base-uri (uri-relative-to (uri-reference "posts/") blog-base-uri))
+(define feed-uri (uri-relative-to (uri-reference atom-page-name) blog-base-uri))
+(define db-file "/var/lib/nawp/blog.db")
+(define default-author "Chris Brannon")
+
+(define-record post id timestamp slug title author body)
+
+(define (post-body-tree post)
+ (with-input-from-string (post-body post) read))
+
+(define (list-min l)
+ (reduce min (car l) (cdr l)))
+(define (list-max l)
+ (reduce max (car l) (cdr l)))
+
+(define (split-path p)
+ (receive (_ _ parts) (decompose-directory p) (or parts '())))
+
+
+(define (compare-crypted-passwords check against)
+ (string=? (crypt check against) against))
+
+(define (authenticated username password)
+ (call-with-database
+ db-file
+ (lambda (db)
+ (let ((res (query fetch
+ (sql db
+ "SELECT password FROM users where username = ?;")
+ username)))
+ (and (pair? res) (compare-crypted-passwords password (car res)))))))
+
+(define (db-queryer our-db-file)
+ (lambda (statement . args)
+ (call-with-database
+ our-db-file
+ (lambda (db)
+ (apply query (cons fetch-alists (cons (sql db statement) args)))))))
+
+(define (adjust-headings tree)
+ (cond
+ ((null? tree) tree)
+ ((eq? tree 'h1) 'h2)
+ ((eq? tree 'h2) 'h3)
+ ((eq? tree 'h3) 'h4)
+ ((eq? tree 'h4) 'h5)
+ ((eq? tree 'h5) 'h6)
+ ((not (list? tree)) tree)
+ (else (cons (adjust-headings (car tree)) (adjust-headings (cdr tree))))))
+
+
+(define (write-html-page blog-title blog-description canonical-uri feed-uri
+ body #!key (page-title blog-title))
+ (print "Content-type: text/html\n")
+ (print "<!DOCTYPE html>")
+ ;; I stole a lot of this boilerplate stuff from Jekyll.
+ (SXML->HTML
+ `(html
+ (head
+ (meta (@ (charset "utf-8")))
+ (meta (@ (http-equiv "X-UA-Compatible")
+ (content "IE=edge")))
+ (meta (@ (name "viewport")
+ (content "width=device-width, initial-scale=1")))
+ (title ,page-title)
+ (meta (@ (name "description")
+ (content ,blog-description)))
+ (link (@ (rel "canonical") (href ,canonical-uri)))
+ (link (@ (rel "alternate")
+ (type "application/rss+xml")
+ (title ,blog-title)
+ (href ,feed-uri))))
+ (body ,@body))))
+
+(define (make-ahref uri text)
+ `(a (@ (href ,uri)) ,text))
+
+(define (format-post-date post)
+ (time->string (seconds->local-time
+ (post-timestamp post)) "%a, %d %b %Y %H:%M:%S %z"))
+
+(define (post-slug-uri post)
+ (uri->string (uri-relative-to (uri-reference (post-slug post)) posts-base-uri)))
+
+(define (format-post-link post #!key (in-list #t))
+ (let ((link (post-slug-uri post)))
+ (if in-list
+ (list
+ 'li (make-ahref link
+ (sprintf "~a: ~a" (format-post-date post) (post-title post))))
+ (make-ahref link (post-title post)))))
+
+(define (transform-for-sxhtml post #!key h1)
+ (cons
+ (if h1
+ (list 'h1 (post-title post))
+ (list 'h2 (format-post-link post in-list: #f)))
+ (cons
+ (list 'p '(@ ("style" "font-size:14px;color:#828282;"))
+ (sprintf "~a - ~a" (format-post-date post) (post-author post))) (post-body-tree post))))
+
+(define (min-post-id)
+ (let ((res
+ ((db-queryer db-file) "SELECT min(id) as m FROM posts;")))
+ (if (pair? res) (assoc 'm (car res)) 0)))
+
+(define (latest-sxhtml #!key before)
+ (receive (posts stop-offset)
+ (avalues
+ (fetch-latest-posts before)
+ (and (pair? it) (list-min (map post-id it))))
+ (let ((older-link
+ (if (and stop-offset (> stop-offset (min-post-id))) (list (make-ahref (sprintf "?before=~s" stop-offset) "Older")) '())))
+ (write-html-page
+ blog-title blog-description (uri->string blog-base-uri)
+ (uri->string feed-uri)
+ (append (concatenate (map transform-for-sxhtml posts)) '((br)) older-link
+ '((br)) (list (make-ahref "all-post-links" "Links to all posts")))))))
+
+(define (all-post-links)
+ (write-html-page
+ blog-title blog-description (uri->string blog-base-uri)
+ (uri->string feed-uri)
+ (list
+ (cons 'ul
+ (map (compose format-post-link row->post)
+ ((db-queryer db-file) "SELECT slug, title, author, timestamp FROM blog_entries;"))))
+ page-title: (sprintf "~a -- Links to All Posts" blog-title)))
+
+(define seconds->rfc3339-string (compose rfc3339->string seconds->rfc3339))
+
+(define (SXML->HTMLSTRING sxml-expr)
+ (with-output-to-string (lambda () (SXML->HTML sxml-expr))))
+
+(define (atom-entry post)
+ (make-entry
+ id: (post-slug-uri post)
+ updated: (seconds->rfc3339-string (post-timestamp post))
+ title: (make-title (post-title post))
+ content: (make-content (SXML->HTMLSTRING (post-body-tree post)) type: 'html)
+ authors: (list (make-author name: (post-author post)))))
+
+(define (latest-atom)
+ (let ((posts (fetch-latest-posts)))
+ ;; What should an empty feed look like?
+ (when (null? posts) (http-fail 503 "Service unavailable."))
+ (make-atom-doc
+ (make-feed id: "foo" title: (make-title "foo")
+ updated: (seconds->rfc3339-string (list-max (map post-timestamp posts)))
+ entries: (map atom-entry posts)))))
+
+(define (row->post row)
+ (apply make-post
+ (map
+ (lambda (field) (aand (assoc field row) (cdr it)))
+ '(title timestamp slug title author body))))
+
+(define (fetch-latest-posts #!key before)
+ ;; What I really want here is a composable sexp representation of SQL.
+ (let* ((queryer (db-queryer db-file)))
+ (map row->post
+ (if before
+ (queryer "SELECT * FROM blog_entries WHERE id < ? ORDER BY id DESC LIMIT 40;" before)
+ (queryer "SELECT * from blog_entries ORDER BY id DESC LIMIT 40;")))))
+
+(define (add-user username password display-name)
+ (let ((crypted-password (crypt password (crypt-gensalt type: 'sha512))))
+ (call-with-database
+ db-file
+ (lambda (db)
+ (exec
+ (sql db
+ "INSERT INTO users (username, password, display_name) VALUES (?,?,?);")
+ username crypted-password display-name)))))
+
+(define (add-post slug title author body-md)
+ (let ((body-sxhtml-string (sprintf "~s" (adjust-headings (markdown->sxml body-md)))))
+ (call-with-database
+ db-file
+ (lambda (db)
+ (exec
+ (sql db
+ "INSERT INTO blog_entries (slug, title, author, body, timestamp) VALUES (?,?,?,?,?);")
+ slug title author body-sxhtml-string (current-seconds))))))
+
+(define (form-field-value key form)
+ (aand (assoc key form) (cdr it)))
+
+(define (http-fail status message)
+ (print "Content-type: text/html")
+ (printf "Status: ~a\n\n" status)
+ (printf "<html><head><title>Error</title></head><body>~a</body></html\n" message)
+ (exit 0))
+
+(define (http-redirect code uri)
+ (printf "Status: ~a\nContent-type: text/html\nLocation: ~a\n\n"
+ code uri)
+ (printf "<html><head><title>Redirected</title></head><body><a href=\"~a\">click here</a>\n\n" uri)
+ (exit 0))
+
+(define (read-response)
+ (form-urldecode (read-string 3333333)))
+
+(define (send-one-post slug)
+ (let ((post-l ((db-queryer db-file) "SELECT * FROM blog_entries WHERE slug = ?;" slug)))
+ (when (null? post) (http-fail 404 "Post not known."))
+ (let ((post (row->post (car post-l))))
+ (write-html-page
+ blog-title blog-description (uri->string blog-base-uri)
+ (uri->string feed-uri)
+ (transform-for-sxhtml post h1: #t)
+ page-title: (post-title post)))))
+
+(define (lookup-author-name username)
+ (let ((res ((db-queryer db-file) "SELECT display_name FROM users WHERE username = ?" username)))
+ (when (null? res) "unknown")
+ (cdr (assoc 'display_name (car res)))))
+
+(define (make-form-input name #!key (type "text"))
+ (list (sprintf "~a:" (string-titlecase name))
+ `(input (@ (type ,type) (name ,name)))
+ '(br)))
+
+(define post-form
+ `(html
+ (head (title "Write a Post"))
+ (body
+ (form (@ (method "post"))
+ ,@(make-form-input "username")
+ ,@(make-form-input "password" type: "password")
+ ,@(make-form-input "slug")
+ ,@(make-form-input "title")
+ "Content:"
+ (br)
+ (textarea (@ (name "body")))
+ (input (@ (type "submit")))))))
+
+(define (route request-method path-info)
+ (match
+ (cons request-method path-info)
+ (("GET")
+ (latest-sxhtml
+ before: (form-field-value
+ 'before (form-urldecode
+ (get-environment-variable "QUERY_STRING")))))
+ (("GET" "feed.atom")
+ (print "Content-type: application/atom+xml\n")
+ (write-atom-doc (latest-atom )))
+ (("GET" "post-form")
+ (print "Content-type: text/html\n")
+ (SXML->HTML post-form))
+ (("POST" "post-form")
+ (let* ((response (read-response))
+ (username (form-field-value 'username response))
+ (password (form-field-value 'password response))
+ (slug (form-field-value 'slug response))
+ (title (form-field-value 'title response))
+ (author (lookup-author-name username))
+ (body (form-field-value 'body response)))
+ (when (not (and username password slug title author body))
+ (http-fail 400 "Bad request."))
+ (unless (authenticated username password)
+ (http-fail 403 "Bad credentials."))
+ (add-post slug title author body)
+ (http-redirect 303 (uri->string blog-base-uri))))
+ (("GET" "posts" slug)
+ (send-one-post slug))
+ (("GET" "all-post-links") (all-post-links))
+ (everything-else
+ (http-fail 400 "Bad request."))))
+
+(define (cgi-main)
+ (let (
+ (path-info
+ (split-path (string-trim-both
+ (or (get-environment-variable "PATH_INFO") "/")
+ #\/)))
+ (request-method (get-environment-variable "REQUEST_METHOD")))
+ (route request-method path-info)))
+
+;; We should use stty for this, but the stty egg appears broken on musl
+;; for now. I use musl.
+(define (read-password prompt)
+ (display prompt)
+ (flush-output)
+ ;; (with-stty '(not echo) read-line))
+ (read-line))
+
+(define (help)
+ (let ((program-base (pathname-file (program-name))))
+ (printf "Usage: ~a adduser USERNAME DISPLAY-NAME\n" program-base)
+ (print " adds a new user, prompting for the password.\n")
+ (print "If this program is called without arguments, it operates in CGI mode.\n")))
+
+(define (main)
+ (match (command-line-arguments)
+ (() (cgi-main))
+ ((adduser username display-name)
+ (add-user username (read-password "Password: ") display-name))
+ (everything-else (help))))
+
+(main)
diff --git a/schema.sql b/schema.sql
new file mode 100644
index 0000000..23e4d71
--- /dev/null
+++ b/schema.sql
@@ -0,0 +1,12 @@
+CREATE TABLE blog_entries (
+ ID INTEGER PRIMARY KEY AUTOINCREMENT,
+ timestamp INTEGER,
+ slug TEXT UNIQUE NOT NULL,
+ title TEXT,
+ author TEXT,
+ body TEXT);
+
+CREATE TABLE users (
+ username VARCHAR(20) PRIMARY KEY,
+ password VARCHAR(255),
+ display_name VARCHAR(255));