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core.clj
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core.clj
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(ns inbox-feed.core
(:use [postal core]
[hiccup core]
[clojure.tools logging cli])
(:import (java.net URL)
(java.util Date)
(java.io File InputStreamReader)
(com.sun.syndication.feed.synd SyndFeed)
(com.sun.syndication.io SyndFeedInput XmlReader))
(:gen-class))
(def encoding (System/getProperty "file.encoding"))
(defn setup-logging []
(let [logger (java.util.logging.Logger/getLogger "")]
(doseq [handler (.getHandlers logger)]
(. handler setFormatter
(proxy [java.util.logging.Formatter] []
(format [record]
(str (Date. (.getMillis record)) " "
(.getLevel record) ": "
(.getMessage record) "\n")))))))
(defn set-log-level! [level]
(let [^java.util.logging.LogManager$RootLogger logger (java.util.logging.Logger/getLogger "")]
(.setLevel logger level)
(doseq [^java.util.logging.Handler handler (.getHandlers logger)]
(. handler setLevel level))))
(let [props (java.util.Properties.)
session (delay (javax.mail.Session/getDefaultInstance props))
conn (atom nil)
creds (atom nil)
connect (fn []
(let [[protocol server user pass] @creds]
(swap! conn (fn [_]
(doto (.getStore @session protocol)
(.connect server user pass))))))]
(defn imap-conn
([protocol server user pass]
(.setProperty props "mail.store.protocol" protocol)
(swap! creds (fn [_] [protocol server user pass]))
(connect))
([]
(if (.isConnected @conn)
@conn
(do (info "Reconnecting to IMAP Server.")
(.close @conn)
(connect)))))
(defn folder [path]
(reduce (fn[h v]
(.getFolder h v))
(.getFolder (imap-conn) (first path))
(rest path)))
(defn message [feed-name subject body-text body-html]
(let [address (javax.mail.internet.InternetAddress. (str feed-name " <inbox-feed@localhost>"))
content (javax.mail.internet.MimeMultipart. "alternative")
text (doto (javax.mail.internet.MimeBodyPart.)
(.setContent body-text (str "text/plain; charset=" encoding "")))
html (doto (javax.mail.internet.MimeBodyPart.)
(.setContent body-html (str "text/html; charset=" encoding "")))]
(doto content
(.addBodyPart text)
(.addBodyPart html))
(doto (javax.mail.internet.MimeMessage. @session)
(.setFrom address)
(.addRecipient javax.mail.Message$RecipientType/TO address)
(.setSubject subject)
(.setContent content))))
(defn append-messages [folder messages]
(when (not (empty? messages))
(.appendMessages folder (into-array messages)))))
(defn schedule-work
([f rate]
(let [pool (java.util.concurrent.Executors/newSingleThreadScheduledExecutor)]
(.scheduleAtFixedRate
pool f (long 0) (long rate) java.util.concurrent.TimeUnit/SECONDS)
pool))
([jobs]
(let [pool (java.util.concurrent.Executors/newSingleThreadScheduledExecutor)]
(doall (for [[f rate] jobs]
(schedule-work pool f rate)))
pool)))
(defn entry [e]
{:author (.getAuthor e)
:categories (into [] (map #(.getName %) (.getCategories e)))
:content (cond (.getDescription e) (.getValue (.getDescription e))
(> (count (.getContents e)) 0) (.getValue (nth (.getContents e) 0))
:default "")
:id (.getUri e)
:link (.getLink e)
:published (.getPublishedDate e)
:title (.getTitle e)
:updated (.getUpdatedDate e)})
(defn parse [url]
(let [input (SyndFeedInput.)
feed (.build input (InputStreamReader.
(-> (URL. url) .openConnection .getInputStream)))]
{:author (.getAuthor feed)
:description (.getDescription feed)
:language (.getLanguage feed)
:link (.getLink feed)
:type (.getFeedType feed)
:published (.getPublishedDate feed)
:title (.getTitle feed)
:entries (map entry (.getEntries feed))}))
(defn diff-feed-entries [curr old]
(reduce (fn[h v]
(if (and (every? false? (map #(= (:id %) (:id v)) old))
(every? false? (map #(= (:title %) (:title v)) old)))
(conj h v) h)) [] curr))
(defn feed-state [entries]
(map #(dissoc % :author :categories :content :link :published :updated) entries))
(let [size 500]
(defn fixed-size-seq [s xs]
(cond (empty? xs) s
(< (count s) size) (apply conj s xs)
:default (let [excess (+ (- (count s) size) (count xs))]
(fixed-size-seq (take (- (count s) excess) s) xs)))))
(defn html-template [feed-name id title url content]
(html [:html
[:head
[:meta {:http-equiv "Content-Type" :content (str "text/html; charset=" encoding "")}]]
[:style {:type "text/css"}
"a { color:#153aa4; text-decoration:underline; }
pre, code { margin: 1.5em 0; white-space: pre; }
pre, code, tt { font: 12px 'andale mono', 'monotype.com',
'lucida console', monospace; line-height: 1.5; }
tt { display: block; margin: 1.5em 0; line-height: 1.5; }"]
[:body {:style "padding:0; margin:0; background:#fff;"}
[:div {:style "font-size: 20px; font-family: Arial,Helvetica,sans-serif;
letter-spacing: -1px; font-weight: bold;"}
[:a {:href url :style "color: #153aa4; text-decoration:none;"} title]]
[:div {:style "font-size: 12px; font-family: Arial, Helvetica, sans-serif; color: #575c5d;"}
(.toString (java.util.Date.))]
[:p {:style "font-size: 13px; font-family: Arial, Helvetica, sans-serif;
color: #404040; line-height:1.3em; padding-bottom:10px;" :bgcolor= "#ffffff"} content]
[:p {:style "font-size: 12px; font-family: Arial, Helvetica, sans-serif; color: #FFFFFF;"} id]]]))
(defn mail-entry [creds feed-name feed-url entry id]
(try
(send-message
(with-meta {:from (str feed-name " <" (:user creds) ">")
:to (:to creds)
:subject (:title entry)
:body [:alternative
{:type (str "text/plain; charset=" encoding "")
:content (str (:title entry) "\n"
(.toString (java.util.Date.)) "\n"
(:link entry) "\n")}
{:type (str "text/html; charset=" encoding "")
:content (html-template
feed-name id (:title entry)
(:link entry) (:content entry))}]
:X-RSS-ID (if id
id feed-url)
:X-RSS-FEED feed-name}
creds))
(catch Exception e
(log :debug "Message send failed retrying.")
(mail-entry creds feed-name entry id))))
(defn inject-entries [feed-name id new-entries]
(let [folder (if id
(folder id)
(folder ["INBOX"]))]
(append-messages folder (map #(message feed-name
(:title %)
(str (:title %) "\n"
(.toString (java.util.Date.)) "\n"
(:link %) "\n")
(html-template
name nil (:title %) (:link %) (:content %)))
new-entries))))
(defn watch-feed [state config url name id]
(try
(log :debug (str "Checking " url))
(let [old-state (state url)
feed (parse url)
name (if (nil? name)
(:title feed) name)
curr-state (:entries feed)
new-entries (diff-feed-entries curr-state old-state)]
(if (:imap-creds config)
(inject-entries name id new-entries)
(doseq [entry new-entries]
(future (mail-entry (:smtp-creds config) name url entry id))))
(dosync (alter state assoc url (fixed-size-seq old-state (feed-state new-entries)))))
(catch Exception e
(warn (str "Error checking " url " " e)))))
(defn watch-feeds [state config]
(doseq [[feed freq id name] (:feed-list config)]
(schedule-work #(watch-feed state config feed name id) (* (if (nil? freq)
60 freq) 60))))
(defn discard-feeds [state config]
(doseq [[url] (:feed-list config)]
(let [feed (parse url)
old-state (state url)
curr-state (feed-state (:entries feed))
new-entries (diff-feed-entries curr-state old-state)]
(dosync (alter state assoc url (fixed-size-seq old-state (feed-state new-entries)))))))
(defn prepare-config [file]
(try
(let [config (apply hash-map (read-string (slurp (File. file))))]
(if (nil? (->> config :smtp-creds :user))
(assoc-in config [:smtp-creds :user] "inbox-feed@localhost")
config))
(catch Exception e
(warn (str "Error reading config file. " e))
(System/exit 1))))
(defn prepare-state [file]
(ref
(if (.exists (File. file))
(try (read-string (slurp file))
(catch Exception e
(warn "Error reading feed data.")
{}))
{})))
(def writer-agent (agent true))
(defn atomic-dump [_ obj feed-data]
(try
(let [data-file (File. feed-data)
tmp-file (File. (str feed-data ".tmp"))]
(binding [*out* (java.io.FileWriter. tmp-file)]
(prn obj))
(.renameTo tmp-file data-file))
true
(catch Exception e
(warn e)
true)))
(defn -main [& args]
(let [[opts _ banner] (cli args
["--verbose" "Verbose mode" :default false :flag true]
["--config" "Config file location" :default "./config.clj"]
["--data" "Feeds data file" :default "./feeds.data"]
["--discard" "Do not send current feed content" :default false :flag true]
["--help" "Show help" :default false :flag true])
{:keys [verbose config data discard help]} opts]
(when help
(println "Inbox Feed")
(println banner)
(System/exit 0))
(setup-logging)
(when verbose
(set-log-level! java.util.logging.Level/ALL))
(let [config (prepare-config config)
state (prepare-state data)]
(info (str "Using " encoding " encoding."))
(when (:imap-creds config)
(info "Connecting to IMAP Server.")
(apply imap-conn (:imap-creds config)))
(add-watch state "save-state" (fn [k r o n]
(send writer-agent atomic-dump n data)))
(when discard
(info "Discarding current feed content.")
(discard-feeds state config))
(watch-feeds state config))))
(comment
(watch-feeds sample-config)
(let [config (prepare-config "config.clj")
state (prepare-state "feeds.data")]
;;(watch-feeds state config)
(discard-feeds state config)
;; (let [[feed freq name id] (nth (:feed-list config) 5)]
;; (watch-feed state config feed name id)
;; :t
;; (println [feed freq name id])
;; )
)
)