misc

commit 2f2183cd2349530513ca8aa7b2d856827ea9d61e
parent 5df16c096c92cbe1008ed8bb3ee1d0b53bd27762
Author: alex wennerberg <alex@alexwennerberg.com>
Date:   Sun, 24 Oct 2021 18:03:20 -0700

Create pinky client

Diffstat:
A
pinky.go
 | 
105
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 105 insertions(+), 0 deletions(-)
diff --git a/pinky.go b/pinky.go
@@ -0,0 +1,105 @@
+package main
+
+// A very simple client for the Pinky aggregation format
+// https://alex.flounder.online/tech/pinky.gmi
+// Only supports finger ATM
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"net"
+	"net/url"
+	"os"
+	"strings"
+	"time"
+)
+
+const LAYOUT = "2006-01"
+
+func main() {
+	configPath := "pinky-urls"
+	file, err := os.Open(configPath)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+
+	dates := make(map[string][]string)
+	for scanner.Scan() {
+		t := scanner.Text()
+		// TODO goroutine
+		date, err := getDate(t) // yyyy-mm formatted date
+		if err != nil {
+			// log.Println(err)
+			continue
+		}
+		_, ok := dates[date]
+		if !ok {
+			dates[date] = []string{}
+		}
+		dates[date] = append(dates[date], t)
+	}
+
+	if err := scanner.Err(); err != nil {
+		log.Fatal(err)
+	}
+
+	keys := make([]string, 0, len(dates))
+	for k := range dates {
+		keys = append(keys, k)
+	}
+	for _, k := range keys {
+		fmt.Println(k)
+		for _, u := range dates[k] {
+			fmt.Println(u)
+		}
+	}
+}
+
+// returns yyyy-mm
+func getDate(myurl string) (string, error) {
+	log.Println("Getting date for " + myurl)
+	u, err := url.Parse(myurl)
+	if err != nil {
+		return "", err
+	}
+	switch u.Scheme {
+	// This is a draft spec: https://datatracker.ietf.org/doc/html/draft-ietf-uri-url-finger-02
+	case "finger":
+		return getFingerDate(u)
+	}
+	return "", fmt.Errorf("invalid protocol")
+}
+
+func getFingerDate(url *url.URL) (string, error) {
+	conn, err := net.DialTimeout("tcp", url.Host+":79", 5*time.Second)
+	if err != nil {
+		return "", err
+	}
+	defer conn.Close()
+	_, err = conn.Write([]byte(url.Path[1:] + "\r\n"))
+	scanner := bufio.NewScanner(conn)
+	n := 0
+	for scanner.Scan() {
+		t := scanner.Text()
+		// fmt.Println(t)
+		if strings.HasPrefix(t, "Updated: ") {
+			spl := strings.Split(t, " ")
+			u, err := time.Parse(LAYOUT, spl[1])
+			if u.After(time.Now()) {
+				return "", fmt.Errorf("In the future")
+			}
+			if err == nil {
+				return spl[1], nil
+			}
+		}
+		n++
+		if n >= 3 {
+			break
+		}
+	}
+	return "", fmt.Errorf("No valid updated field found")
+}