Initial import

LICENSE

@@ -0,0 +1,339 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+  The licenses for most software are designed to take away your
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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+
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+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
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+    (at your option) any later version.
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+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
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+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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+Also add information on how to contact you by electronic and paper mail.
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+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
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+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
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+
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+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

README.md

@@ -0,0 +1,89 @@
+# RSS2Hook
+
+This project is a self-hosted utility which will make HTTP POST
+requests to remote web-hooks when new items appear in an RSS feed.
+
+
+## Rational
+
+I have a couple of webhooks in-place already which will take incoming
+HTTP requests and "do stuff" with them, for example:
+
+* Posting to my alerting system.
+   * Which is called [purppura](https://github.com/skx/purppura/) and is pretty neat.
+* Posting to IRC.
+   * IRC was mattermost before slack before born.
+
+I _also_ have a bunch of RSS feeds that I follow, typically these include
+github releases of projects.  For example my git-host is [gitbucket](https://github.com/gitbucket/gitbucket) so I subscribe to the release feed via:
+
+* https://github.com/gitbucket/gitbucket/releases.atom
+
+
+## Deployment
+
+If you have a working golang setup you should be able to install this
+application via:
+
+    go get -u  github.com/skx/rss2hook
+    go install github.com/skx/rss2hook
+
+
+## Setup
+
+There are two parts to the setup:
+
+* Configure the list of feeds and the corresponding hooks to post to.
+* Ensure the program is running.
+
+For the first create a configuration-file like so:
+
+    http://example.com/feed.rss = https://webhook.example.com/notify/me
+...
+
+For the second you can use your favourite supervision took, but in short
+you'll want to run something like this:
+
+     $ rss2hook -config ./sample.cfg
+
+
+### Sample Webhook
+
+There is a simple webhook example beneath [webhook/](webhook/) which
+will listen upon localhost:8080, and dump any POST submission to the
+console.
+
+You can launch it like so:
+
+     cd webhook/
+     go run webhook.go
+
+Testing it via `curl` would look like this:
+
+      $ curl --header "Content-Type: application/json"  \
+      --request POST \
+      --data '{"username":"xyz","password":"xyz"}' \
+      http://localhost:8080/
+
+Finally you'd use the [sample.cfg](sample.cfg) file to POST to this
+server by launching the application:
+
+    $ rss2hook --config=sample.cfg
+
+## Feedback?
+
+Turning this into a SaaS project would be interesting.  A simple setup
+would be very straight-forward to implement, however at a larger scale
+it would get more interesting:
+
+* Assume two people have subscribed to the same feed.
+   * But they did so a few days apart.
+* That means what is "new" to each of them differs.
+   * So you need to keep track of "seen" vs. "new" on a per-user __and__ per-feed basis.
+
+Anyway it would be fun to implement, but I'm not sure there is a decent
+revenue model out there for it.  Especially when you can wire up [IFTTT](https://ifttt.com/) or [similar](https://zapier.com/apps/rss/integrations/webhook/1746/send-a-webhook-when-an-rss-feed-is-updated) system to do the same thing.
+
+
+Steve
+--

rss2hook.go

@@ -0,0 +1,254 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"crypto/sha1"
+	"encoding/hex"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"os/signal"
+	"regexp"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/mmcdole/gofeed"
+	"github.com/robfig/cron"
+)
+
+// RSSEntry describes a single RSS feed and the corresponding hook
+// to POST to.
+type RSSEntry struct {
+	feed string
+	hook string
+}
+
+// Loaded contains the loaded feeds + hooks, as read from the specified
+// configuration file
+var Loaded []RSSEntry
+
+// loadConfig loads the named configuration file and populates our
+// `Loaded` list of RSS-feeds & Webhook addresses
+func loadConfig(filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Printf("Error opening %s - %s\n", filename, err.Error())
+		return
+	}
+	defer file.Close()
+
+	//
+	// Process it line by line.
+	//
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		tmp := scanner.Text()
+		tmp = strings.TrimSpace(tmp)
+
+		//
+		// Skip lines that begin with a comment.
+		//
+		if (tmp != "") && (!strings.HasPrefix(tmp, "#")) {
+
+			//
+			// Otherwise find the feed + post-point
+			//
+			parser := regexp.MustCompile("^(.*)=([^=]+)")
+			match := parser.FindStringSubmatch(tmp)
+			if len(match) == 3 {
+				entry := RSSEntry{feed: strings.TrimSpace(match[1]),
+					hook: strings.TrimSpace(match[2])}
+				Loaded = append(Loaded, entry)
+			}
+
+		}
+	}
+
+}
+
+// fetchFeed fetches a feed from the remote URL.
+func fetchFeed(url string) (string, error) {
+
+	client := &http.Client{Timeout: time.Duration(5 * time.Second)}
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return "", err
+	}
+
+	req.Header.Set("User-Agent", "rss2email (https://github.com/skx/rss2email)")
+	resp, err := client.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	output, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+	return string(output), nil
+}
+
+// isNew returns TRUE if this feed-item hasn't been notified about
+// previously.
+func isNew(parent string, item *gofeed.Item) bool {
+
+	hasher := sha1.New()
+	hasher.Write([]byte(parent))
+	hasher.Write([]byte(item.GUID))
+	hashBytes := hasher.Sum(nil)
+
+	// Hexadecimal conversion
+	hexSha1 := hex.EncodeToString(hashBytes)
+
+	if _, err := os.Stat(os.Getenv("HOME") + "/.rss2hook/seen/" + hexSha1); os.IsNotExist(err) {
+		return true
+	}
+	return false
+}
+
+// recordSeen ensures that we won't re-announce a given feed-item.
+func recordSeen(parent string, item *gofeed.Item) {
+
+	hasher := sha1.New()
+	hasher.Write([]byte(parent))
+	hasher.Write([]byte(item.GUID))
+	hashBytes := hasher.Sum(nil)
+
+	// Hexadecimal conversion
+	hexSha1 := hex.EncodeToString(hashBytes)
+
+	dir := os.Getenv("HOME") + "/.rss2hook/seen"
+	os.MkdirAll(dir, os.ModePerm)
+
+	_ = ioutil.WriteFile(dir+"/"+hexSha1, []byte(item.Link), 0644)
+
+}
+
+// checkFeeds is our work-horse.
+//
+// For each available feed it looks for new entries, and when founds
+// triggers `notify` upon the resulting entry
+func checkFeeds() {
+
+	for _, monitor := range Loaded {
+
+		content, err := fetchFeed(monitor.feed)
+
+		if err != nil {
+			fmt.Printf("Error fetching %s - %s\n",
+				monitor.feed, err.Error())
+			continue
+		}
+
+		// Now we have the content - parse the feed
+		fp := gofeed.NewParser()
+		feed, err := fp.ParseString(content)
+		if err != nil {
+			fmt.Printf("Error parsing %s contents: %s\n", monitor.feed, err.Error())
+			continue
+		}
+
+		// For each entry in the feed ..
+		for _, i := range feed.Items {
+
+			// If we've not already notified about this one.
+			if isNew(monitor.feed, i) {
+
+				err := notify(monitor.hook, i)
+				if err == nil {
+					recordSeen(monitor.feed, i)
+				}
+			}
+		}
+	}
+}
+
+// notify actually submits the specified item to the remote webhook.
+//
+// The RSS-item is submitted as a JSON-object.
+func notify(hook string, item *gofeed.Item) error {
+	jsonValue, err := json.Marshal(item)
+	if err != nil {
+		fmt.Printf("notify: Failed to encode JSON:%s\n", err.Error())
+		return err
+	}
+
+	//
+	// Post to purppura
+	//
+	res, err := http.Post(hook,
+		"application/json",
+		bytes.NewBuffer(jsonValue))
+
+	if err != nil {
+		fmt.Printf("notify: Failed to POST to %s - %s\n",
+			hook, err.Error())
+		return err
+	}
+
+	//
+	// OK now we've submitted the post.
+	//
+	// We should retrieve the status-code + body, if the status-code
+	// is "odd" then we'll show them.
+	//
+	defer res.Body.Close()
+	_, err = ioutil.ReadAll(res.Body)
+	if err != nil {
+		return err
+	}
+	status := res.StatusCode
+
+	if status != 200 {
+		fmt.Printf("notify: Warning - Status code was not 200: %d\n", status)
+	}
+	return nil
+}
+
+// main is our entry-point
+func main() {
+
+	// Parse the command-line flags
+	config := flag.String("config", "", "The path to the configuration-file to read")
+	flag.Parse()
+
+	if *config == "" {
+		fmt.Printf("Please specify a configuration-file to read\n")
+		return
+	}
+
+	//
+	// Load the configuration file
+	//
+	loadConfig(*config)
+
+	// Show the things we're monitoring
+	for _, ent := range Loaded {
+		fmt.Printf("Monitoring feed %s\nPosting to %s\n\n",
+			ent.feed, ent.hook)
+	}
+
+	// Make the initial load
+	checkFeeds()
+
+	// Now repeat that every five minutes
+	c := cron.New()
+	c.AddFunc("@every 5m", func() { checkFeeds() })
+	c.Start()
+
+	// Wait to be terminated.
+	sigs := make(chan os.Signal, 1)
+	done := make(chan bool, 1)
+	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
+	go func() {
+		_ = <-sigs
+		done <- true
+	}()
+	<-done
+}

sample.cfg

@@ -0,0 +1,28 @@
+#
+# This is the sample configuration file for rss2hook.
+#
+# rss2hook is designed to make a HTTP-POST to a webhook
+# when a new RSS item appears in a feed.
+#
+# There are two things to specify:
+#
+#   * The URL of the RSS feed to monitor.
+#
+#   * The corresponding end-point to make the POST request to.
+#
+# In this configuration-file they're specified as pairs like so:
+#
+#   RSS = HOOK
+#
+
+
+#
+# The following example reads from my blog, and posts to the sample
+# webhook-handler as included in the repository:
+#
+https://blog.steve.fi/index.rss = http://localhost:8080/
+
+#
+# We have a second feed here, containing news stories from the BBC
+#
+http://feeds.bbci.co.uk/news/rss.xml = http://localhost:8080/

webhook/webhook.go

@@ -0,0 +1,37 @@
+// webhook.go is a simple example program that will listen upon
+// localhost:8080 and dump the contents of any HTTP POST received
+// to the console.
+//
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+)
+
+// HandleHook is called on any access to the server-root.
+//
+// If a POST request is received dump it to the console.  Regardless
+// of the requested method we then send an "OK" response to the caller.
+func HandleHook(w http.ResponseWriter, r *http.Request) {
+
+	if r.Method == "POST" {
+		content, _ := ioutil.ReadAll(r.Body)
+		fmt.Printf("%s\n", content)
+	}
+	// Always return a response to the caller.
+	io.WriteString(w, "OK\n")
+}
+
+func main() {
+
+	// Bind our handler
+	http.HandleFunc("/", HandleHook)
+
+	// Launch the server
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}