Create basic ActivityPub inspector utility

Prints AP information for a given URL.

go.mod

@@ -0,0 +1,3 @@
+module code.as/matt/ap-inspect
+
+go 1.18

main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+)
+
+func main() {
+	if len(os.Args) < 2 {
+		log.Fatalln("usage: ap-inspect BLOG-URL")
+	}
+	blogURL := os.Args[1]
+
+	// Set up request
+	req, err := http.NewRequest("GET", blogURL, nil)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	req.Header.Set("Accept", "application/activity+json")
+
+	// Send request
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	if resp != nil && resp.Body != nil {
+		defer resp.Body.Close()
+	}
+
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	fmt.Printf("Status  : %s\n", resp.Status)
+
+	// Pretty-print the response
+	var fmttd bytes.Buffer
+	err = json.Indent(&fmttd, body, "", "  ")
+	if err != nil {
+		log.Fatalln(err)
+	}
+	fmt.Printf("Response:\n%s\n", fmttd.String())
+}