@@ -0,0 +1,1 @@ 
+navani

@@ -0,0 +1,39 @@ 
+package cache
+
+import (
+	"github.com/gomodule/redigo/redis"
+)
+
+type conn struct {
+	redis.Conn
+}
+
+// Returns a new redis connection.
+func NewConn() (conn, error) {
+	c, err := redis.Dial("tcp", ":6379")
+	if err != nil {
+		c.Close()
+		return conn{}, err
+	}
+	return conn{c}, nil
+}
+
+// SET command.
+func (c *conn) Set(args ...interface{}) (interface{}, error) {
+	cmd := "SET"
+	reply, err := c.Do(cmd, args...)
+	if err != nil {
+		return nil, err
+	}
+	return reply, nil
+}
+
+// GET command. We stringify the response.
+func (c *conn) Get(args ...interface{}) (string, error) {
+	cmd := "GET"
+	reply, err := redis.String(c.Do(cmd, args...))
+	if err != nil {
+		return "", err
+	}
+	return reply, nil
+}

@@ -0,0 +1,11 @@ 
+module git.icyphox.sh/forlater/navani
+
+go 1.16
+
+require (
+	github.com/go-shiori/go-readability v0.0.0-20210627123243-82cc33435520
+	github.com/gomodule/redigo v1.8.5
+	github.com/microcosm-cc/bluemonday v1.0.15
+	golang.org/x/net v0.0.0-20210908191846-a5e095526f91 // indirect
+	mvdan.cc/xurls/v2 v2.3.0
+)

@@ -0,0 +1,175 @@ 
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@@ -0,0 +1,1 @@ 
+

@@ -0,0 +1,36 @@ 
+package mail
+
+import (
+	"fmt"
+
+	"github.com/microcosm-cc/bluemonday"
+	"mvdan.cc/xurls/v2"
+)
+
+type Mail struct {
+	From    string
+	Date    string
+	ReplyTo string
+	Parts   map[string]string
+}
+
+// Extracts URLs from given text.
+func ExtractURLs(text string) []string {
+	x := xurls.Strict()
+	return x.FindAllString(text, -1)
+}
+
+// Returns the main body of the email; hopefully containing URLs.
+func MailBody(parts map[string]string) (string, error) {
+	if plain, ok := parts["text/plain"]; ok {
+		return plain, nil
+	} else if html, ok := parts["text/html"]; ok {
+		p := bluemonday.NewPolicy()
+		p.AllowStandardURLs()
+		p.AddSpaceWhenStrippingTag(true)
+		clean := p.Sanitize(html)
+		return clean, nil
+	} else {
+		return "", fmt.Errorf("no good MIME type found")
+	}
+}

@@ -0,0 +1,42 @@ 
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"net/url"
+
+	"git.icyphox.sh/forlater/navani/mail"
+	"git.icyphox.sh/forlater/navani/reader"
+)
+
+func main() {
+	http.HandleFunc("/webhook", func(w http.ResponseWriter, r *http.Request) {
+		m := mail.Mail{}
+		json.NewDecoder(r.Body).Decode(&m)
+		body, err := mail.MailBody(m.Parts)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		for _, u := range distinct(mail.ExtractURLs(body)) {
+			parsedURL, err := url.Parse(u)
+			if err != nil {
+				log.Fatal(err)
+			}
+
+			f, err := reader.Fetch(parsedURL.String())
+			if err != nil {
+				log.Fatal(err)
+			}
+
+			article, err := reader.Readable(f, parsedURL)
+			if err != nil {
+				log.Fatal(err)
+			}
+		}
+		w.WriteHeader(204)
+	})
+
+	http.ListenAndServe(":8001", nil)
+}

@@ -0,0 +1,53 @@ 
+package reader
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"git.icyphox.sh/forlater/navani/cache"
+	readability "github.com/go-shiori/go-readability"
+)
+
+func checksum(s []byte) string {
+	h := sha1.New()
+	h.Write(s)
+	b := h.Sum(nil)
+	return hex.EncodeToString(b)
+}
+
+// Fetches the web page and stores the hash of the URL against
+// the response body in cache. Returns an io.Reader.
+func Fetch(url string) (io.Reader, error) {
+	sum := checksum([]byte(url))
+	c, err := cache.NewConn()
+
+	body, err := c.Get(sum)
+	// Not in cache.
+	if err != nil {
+		resp, err := http.Get(url)
+		if err != nil {
+			return nil, err
+		}
+		if b, err := io.ReadAll(resp.Body); err == nil {
+			c.Set(sum, b)
+		}
+		return resp.Body, nil
+	}
+	return strings.NewReader(body), nil
+}
+
+// Makes a given html body readable. Returns an error if it
+// can't.
+func Readable(r io.Reader, u *url.URL) (readability.Article, error) {
+	article, err := readability.FromReader(r, u)
+	if err != nil {
+		return readability.Article{}, fmt.Errorf("failed to parse %s: %v\n", u, err)
+	}
+
+	return article, nil
+}

@@ -0,0 +1,13 @@ 
+package main
+
+func distinct(duplicates []string) []string {
+	keys := make(map[string]bool)
+	list := []string{}
+	for _, item := range duplicates {
+		if _, value := keys[item]; !value {
+			keys[item] = true
+			list = append(list, item)
+		}
+	}
+	return list
+}