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(ns cljssss-g
(require [clojure.xml :as xml]
[clojure.contrib.sql :as sql]
compojure)
(import (org.antlr.stringtemplate StringTemplateGroup)
(com.sun.syndication.io SyndFeedInput XmlReader)
(com.sun.syndication.feed.synd SyndFeed SyndEntry)
(java.net URL))
(use compojure))
(Class/forName "org.sqlite.JDBC")
(def templates (new StringTemplateGroup ""))
(def db-connection-data {:classname "org.sqlite.JDBC"
:subprotocol "sqlite"
:subname "cljssss-g.sqlite3"
:create true})
(defmacro with-db [& body]
`(sql/with-connection db-connection-data
~@body))
(defmacro with-dbt [& body]
`(with-db
(sql/transaction
~@body)))
;;; FIXME: clojure has no way of creating interfaces on-the-fly. So I
;;; cannot use stringtemplate here.
(defn opml-string [id]
(with-dbt
(sql/with-query-results
results
["SELECT feed.uri, feed.link, user_feed_link.title FROM feed, user_feed_link WHERE user_feed_link.feed=feed.id AND user_feed_link.user=?" id]
(str "<?xml version=\"1.0\" encoding=\"utf-8\"?><opml version=\"1.0\"><head>"
"<dateCreated>blah</dateCreated>"
"<title>Gödel-Gentzen Clojure Syndication Services Super System Feed Export</title></head><body>"
(loop [clstr "" r results]
(if (first r)
(recur
(str clstr
"<outline text=\""
(:title (first r))
"\" xmlUrl=\""
(:uri (first r))
"\" htmlUrl=\""
(:link (first r))
"\" />")
(rest r))
clstr))
"</body></opml>"))))
(defn lynxy-feedlist [id]
(with-dbt
(sql/with-query-results
results
["SELECT feed.id, feed.uri, feed.link, user_feed_link.title FROM feed, user_feed_link WHERE user_feed_link.feed=feed.id AND user_feed_link.user=?" id]
(html `[html [head [title "Gödel-Gentzen Clojure Syndication Services Super System"]]
[body [ul
~@(loop [back '[] r results]
(if (first r)
(recur (concat back `[[li
[a {:href ~(str "lynxy-showfeed?feed=" (:id (first r)))}
~(:title (first r)) " - "
~(:link (first r))
]]])
(rest r))
back))]]]))))
(defn lynxy-showfeed [id feednum]
(with-dbt
(sql/with-query-results
results
["SELECT entry.link, entry.title FROM entry, feed_entry_link, user_feed_link WHERE entry.id = feed_entry_link.entry AND feed_entry_link.feed = user_feed_link.feed AND user_feed_link.user = ? AND user_feed_link.feed = ?" id feednum]
(html `[html [head [title "Gödel-Gentzen Clojure Syndication Services Super System"]]
[body [ul
~@(loop [back '[] r results]
(if (first r)
(recur (concat back `[[li
[a {:href ~(:link (first r))}
~(:title (first r)) " - "
~(:link (first r))
]]])
(rest r))
back))]
[a {:href "lynxy-feedlist.html"} "« To Feedlist"]
]]))))
(defmacro with-session [& body]
`(if (not (~'session :id))
(redirect-to "/login")
(do ~@body)))
(defservlet cljssss-g
(GET "/login"
(if (= (params :valuesofbetawillgiverisetodom) "true")
(.toString (doto
(.getInstanceOf templates "login")
(.setAttributes {"logintext" "Login failed"})))
(.toString (doto
(.getInstanceOf templates "login")
(.setAttributes {"logintext" "Login"})))))
(POST "/login"
(dosync
(with-db
(sql/with-query-results [{id :id password :password}]
["SELECT id, password FROM user WHERE name = ?"
(params :name)]
(if (= password (params :password))
(do
(alter session assoc :id id)
(redirect-to "/"))
(redirect-to "/login?valuesofbetawillgiverisetodom=true"))))))
(GET "/feedlist.opml"
(with-session (opml-string (session :id))))
(GET "/lynxy-feedlist.html"
(with-session (lynxy-feedlist (session :id))))
(GET "/lynxy-showfeed"
(with-session
(lynxy-showfeed (session :id) (. Integer parseInt (params :feed)))))
(GET "/"
(with-session
(.toString
(doto (.getInstanceOf templates "index")
(.setAttributes {"title" "Subscriptions",
"mainParagraph" "Hi there!"})))))
(ANY "*"
(page-not-found)))
(defn trim-nil [thing]
(and thing (.trim thing)))
(defn maximum-id [table-name]
(sql/with-query-results [max-id-map]
[(str "SELECT MAX(id) FROM " table-name)]
(or (second (first max-id-map)) -1)))
(defn fetch-feed [id]
(with-db
(let [uri (sql/with-query-results [{uri :uri}]
["SELECT uri FROM feed WHERE id = ?" id]
uri),
feed #^SyndFeed (.build (new SyndFeedInput)
(new XmlReader (new URL uri)))]
(sql/transaction
(sql/update-values :feed
["id = ?" id]
{:language (.getLanguage feed)
:iri (.getUri feed)
:link (.getLink feed)
:rights (trim-nil (.getCopyright feed))
:title (trim-nil (.getTitle feed))
:subtitle (trim-nil (.getDescription feed))
:updated (.getPublishedDate feed)})
(doseq [entry #^SyndEntry (.getEntries feed)]
(sql/with-query-results [{potential-entry-id :id}]
["SELECT id FROM entry WHERE iri = ?" (.getUri entry)]
(let [entry-id
(or potential-entry-id (+ 1 (maximum-id "entry")))]
(sql/update-or-insert-values :entry
["id = ?" entry-id]
{:id entry-id
:iri (.getUri entry)
:link (.getLink entry)
:title (trim-nil (.getTitle entry))
:summary_type (if (.getDescription entry)
(.getType (.getDescription entry))
nil)
:summary (if (.getDescription entry)
(.getValue (.getDescription entry))
nil)
:content_type (if (and (.getContents entry)
(first (.getContents entry)))
(.getType (first (.getContents entry)))
nil)
:content (if (and (.getContents entry)
(first (.getContents entry)))
(.getValue (first (.getContents entry)))
nil)
:updated (.getUpdatedDate entry)
:published (.getPublishedDate entry)})
(sql/update-or-insert-values :feed_entry_link
["feed = ? AND entry = ?" id entry-id]
{:feed id
:entry entry-id}))))))))
;; system-wide subscription
(defn subscribe-to-feed [url]
(let [maybe-id
(with-dbt
(when-not
(sql/with-query-results [{id :id}]
["SELECT id FROM feed WHERE uri=?" url]
id)
(let [free-id (+ 1 (maximum-id "feed"))]
(sql/insert-values :feed [:id :uri] [free-id url])
free-id)))]
(when maybe-id
(fetch-feed maybe-id))
maybe-id))
(run-server {:port 8080}
"/*" cljssss-g)
;;;; Sample database content
(comment
(subscribe-to-feed "http://matthias.benkard.de/journal/feed/")
(subscribe-to-feed "http://uxul.wordpress.com/feed/")
(with-dbt
(sql/insert-values :user
[:id :name :password]
[0 "mulk" "klum"])
(sql/insert-values :user_feed_link
[:user :feed :title]
[0 0 "Kompottkins Weisheiten"])
(sql/insert-values :user_feed_link
[:user :feed :title]
[0 1 "Dijkstrabühl"])))
;;;; Database schema
(comment
(with-dbt
(sql/create-table :user
[:id "integer" "PRIMARY KEY"]
[:name "text"]
[:email "text"]
[:password "text"]))
(with-dbt
(sql/create-table :feed
[:id "integer" "PRIMARY KEY"]
[:uri "text"]
[:language "text"]
[:iri "text"]
[:icon "blob"]
[:link "text"]
[:logo "text"]
[:rights "text"]
[:title "text"]
[:subtitle "text"]
[:updated "timestamp"]))
(with-dbt
(sql/create-table :entry
[:id "integer" "PRIMARY KEY"]
[:uri "text"] ;?
[:language "text"]
[:content "blob"]
[:content_type "text"]
[:iri "text"]
[:link "text"]
[:published "timestamp"]
[:rights "text"]
[:source "integer"] ;:feed
[:title "text"]
[:summary "blob"]
[:summary_type "text"]
[:updated "timestamp"]))
(with-dbt
(sql/create-table :feed_entry_link
[:feed "integer"]
[:entry "integer"]))
(with-dbt
(sql/create-table :user_feed_link ;subscription
[:user "integer"]
[:feed "integer"]
[:title "text"]))
(with-dbt
(sql/create-table :user_entry_link
[:user "integer"]
[:entry "integer"]
[:read "boolean"]
[:marked "boolean"]
[:hidden "boolean"])))
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