Simple blogging system written in Go https://goblog.app
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package main
import (
"bytes"
"context"
"encoding/gob"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"net/url"
"time"
"go.goblog.app/app/pkgs/contenttype"
)
type apRequest struct {
BlogIri, To string
Activity []byte
Try int
}
func (a *goBlog) initAPSendQueue() {
go func() {
for {
qi, err := a.db.peekQueue("ap")
if err != nil {
log.Println(err.Error())
continue
} else if qi != nil {
var r apRequest
err = gob.NewDecoder(bytes.NewReader(qi.content)).Decode(&r)
if err != nil {
log.Println(err.Error())
_ = a.db.dequeue(qi)
continue
}
if err := a.apSendSigned(r.BlogIri, r.To, r.Activity); err != nil {
if r.Try++; r.Try < 20 {
// Try it again
qi.content, _ = r.encode()
_ = a.db.reschedule(qi, time.Duration(r.Try)*10*time.Minute)
continue
} else {
log.Printf("Request to %s failed for the 20th time", r.To)
log.Println()
_ = a.db.apRemoveInbox(r.To)
}
}
err = a.db.dequeue(qi)
if err != nil {
log.Println(err.Error())
}
} else {
// No item in the queue, wait a moment
time.Sleep(15 * time.Second)
}
}
}()
}
func (db *database) apQueueSendSigned(blogIri, to string, activity interface{}) error {
body, err := json.Marshal(activity)
if err != nil {
return err
}
b, err := (&apRequest{
BlogIri: blogIri,
To: to,
Activity: body,
}).encode()
if err != nil {
return err
}
return db.enqueue("ap", b, time.Now())
}
func (r *apRequest) encode() ([]byte, error) {
var buf bytes.Buffer
err := gob.NewEncoder(&buf).Encode(r)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (a *goBlog) apSendSigned(blogIri, to string, activity []byte) error {
// Create request context with timeout
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
// Create request
var requestBuffer bytes.Buffer
requestBuffer.Write(activity)
r, err := http.NewRequestWithContext(ctx, http.MethodPost, to, &requestBuffer)
if err != nil {
return err
}
iri, err := url.Parse(to)
if err != nil {
return err
}
r.Header.Set("Accept-Charset", "utf-8")
r.Header.Set("Date", time.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05")+" GMT")
r.Header.Set(userAgent, appUserAgent)
r.Header.Set("Accept", contenttype.ASUTF8)
r.Header.Set(contentType, contenttype.ASUTF8)
r.Header.Set("Host", iri.Host)
// Sign request
a.apPostSignMutex.Lock()
err = a.apPostSigner.SignRequest(a.apPrivateKey, blogIri+"#main-key", r, activity)
a.apPostSignMutex.Unlock()
if err != nil {
return err
}
// Do request
resp, err := a.httpClient.Do(r)
if err != nil {
return err
}
defer resp.Body.Close()
if !apRequestIsSuccess(resp.StatusCode) {
body, _ := io.ReadAll(resp.Body)
return fmt.Errorf("signed request failed with status %d: %s", resp.StatusCode, string(body))
}
return nil
}