sirrow/tweetdistributor
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sirrow
2026-07-03 10:18:39 +09:00
parent 62cff6355b
commit c579ae6980
6 changed files with 197 additions and 14 deletions
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5
go.mod
View File

@@ -1,10 +1,11 @@
module tweetdistributor
go 1.24.1
go 1.25.0
require (
github.com/bluesky-social/indigo v0.0.0-20250313000755-d9a74f690c90
github.com/bwmarrin/discordgo v0.28.1
golang.org/x/image v0.43.0
)
require (
@@ -56,7 +57,7 @@ require (
require (
github.com/gorilla/websocket v1.5.3 // indirect
github.com/michimani/gotwi v0.17.0
github.com/michimani/gotwi v0.18.2
golang.org/x/crypto v0.36.0 // indirect
golang.org/x/sys v0.31.0 // indirect
)

104
main.go
View File

@@ -1,16 +1,103 @@
package main
import (
"bytes"
"fmt"
"image"
_ "image/gif"
"image/jpeg"
_ "image/png"
"io"
"net/http"
"os"
"path"
"strings"
"tweetdistributor/discord"
"tweetdistributor/output"
"unicode/utf8"
"github.com/bwmarrin/discordgo"
"golang.org/x/image/draw"
_ "golang.org/x/image/webp"
)
const maxTweetLength = 140
const maxImagesPerPost = 4
// Bluesky rejects blobs over 2,000,000 bytes; Twitter allows up to 5MB.
const maxImageBytes = 2_000_000
// shrinkImage re-encodes (and if necessary downscales) an image until it
// fits within maxImageBytes. Images already small enough pass through
// untouched.
func shrinkImage(img output.Image) (output.Image, error) {
if len(img.Data) <= maxImageBytes {
return img, nil
}
src, _, err := image.Decode(bytes.NewReader(img.Data))
if err != nil {
return output.Image{}, fmt.Errorf("decoding %s: %w", img.Filename, err)
}
for scale := 1.0; scale > 0.05; scale *= 0.7 {
width := int(float64(src.Bounds().Dx()) * scale)
height := int(float64(src.Bounds().Dy()) * scale)
if width < 1 || height < 1 {
break
}
scaled := image.NewRGBA(image.Rect(0, 0, width, height))
draw.CatmullRom.Scale(scaled, scaled.Bounds(), src, src.Bounds(), draw.Src, nil)
var buf bytes.Buffer
if err := jpeg.Encode(&buf, scaled, &jpeg.Options{Quality: 85}); err != nil {
return output.Image{}, fmt.Errorf("encoding %s: %w", img.Filename, err)
}
if buf.Len() <= maxImageBytes {
filename := strings.TrimSuffix(img.Filename, path.Ext(img.Filename)) + ".jpg"
return output.Image{
Data: buf.Bytes(),
ContentType: "image/jpeg",
Filename: filename,
}, nil
}
}
return output.Image{}, fmt.Errorf("%s could not be shrunk below %d bytes", img.Filename, maxImageBytes)
}
func downloadImages(attachments []*discordgo.MessageAttachment) ([]output.Image, error) {
var images []output.Image
for _, attachment := range attachments {
if !strings.HasPrefix(attachment.ContentType, "image/") {
continue
}
resp, err := http.Get(attachment.URL)
if err != nil {
return nil, fmt.Errorf("downloading %s: %w", attachment.Filename, err)
}
data, err := io.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
return nil, fmt.Errorf("downloading %s: %w", attachment.Filename, err)
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("downloading %s: status %s", attachment.Filename, resp.Status)
}
img, err := shrinkImage(output.Image{
Data: data,
ContentType: attachment.ContentType,
Filename: attachment.Filename,
})
if err != nil {
return nil, err
}
images = append(images, img)
}
return images, nil
}
func main() {
d := discord.Discord(os.Getenv("DISCORD_TOKEN"), os.Getenv("DISCORD_CHANNEL"))
@@ -32,8 +119,23 @@ func main() {
d.Write(errstr)
continue
}
images, err := downloadImages(tweet.Attachments)
if err != nil {
errstr := fmt.Sprintf("Error: %s; not posted", err)
fmt.Fprintln(os.Stderr, errstr)
d.Write(errstr)
continue
}
if len(images) > maxImagesPerPost {
errstr := fmt.Sprintf("Error: %d images attached, exceeding the limit of %d; not posted", len(images), maxImagesPerPost)
fmt.Fprintln(os.Stderr, errstr)
d.Write(errstr)
continue
}
for _, output := range outputs {
err := output.Write(tweet.Content)
err := output.Write(tweet.Content, images)
if err != nil {
errstr := fmt.Sprintf("%s Error: %s", output.GetName(), err)
fmt.Fprintln(os.Stderr, errstr)

38
output/bluesky.go
View File

@@ -1,8 +1,9 @@
package output
import (
"bytes"
"context"
"log"
"fmt"
"time"
"github.com/bluesky-social/indigo/api/atproto"
@@ -26,7 +27,7 @@ func BlueskyOutput(identifier string, password string) *blueskyoutput {
return blueskyoutput
}
func (bo *blueskyoutput) Write(str string) error {
func (bo *blueskyoutput) Write(str string, images []Image) error {
cli := &xrpc.Client{
Host: "https://bsky.social",
}
@@ -38,7 +39,7 @@ func (bo *blueskyoutput) Write(str string) error {
output, err := atproto.ServerCreateSession(context.TODO(), cli, input)
if err != nil {
log.Fatal(err)
return err
}
cli.Auth = &xrpc.AuthInfo{
AccessJwt: output.AccessJwt,
@@ -47,14 +48,35 @@ func (bo *blueskyoutput) Write(str string) error {
Did: output.Did,
}
post := &bsky.FeedPost{
Text: str,
CreatedAt: time.Now().Format(util.ISO8601),
Langs: []string{"ja"},
}
if len(images) > 0 {
embedimages := make([]*bsky.EmbedImages_Image, 0, len(images))
for _, img := range images {
blob, err := atproto.RepoUploadBlob(context.TODO(), cli, bytes.NewReader(img.Data))
if err != nil {
return fmt.Errorf("uploading %s: %w", img.Filename, err)
}
embedimages = append(embedimages, &bsky.EmbedImages_Image{
Alt: img.Filename,
Image: blob.Blob,
})
}
post.Embed = &bsky.FeedPost_Embed{
EmbedImages: &bsky.EmbedImages{
Images: embedimages,
},
}
}
Recordinput := &atproto.RepoCreateRecord_Input{
Collection: "app.bsky.feed.post",
Repo: cli.Auth.Did, // "matope.bsky.social" のDID
Record: &lexutil.LexiconTypeDecoder{&bsky.FeedPost{
Text: str,
CreatedAt: time.Now().Format(util.ISO8601),
Langs: []string{"ja"},
}},
Record: &lexutil.LexiconTypeDecoder{Val: post},
}
_, recerr := atproto.RepoCreateRecord(context.TODO(), cli, Recordinput)

8
output/output.go
View File

@@ -1,6 +1,12 @@
package output
type Image struct {
Data []byte
ContentType string
Filename string
}
type OutputInterface interface {
Write(string) error
Write(string, []Image) error
GetName() string
}

5
output/stdout.go
View File

@@ -11,8 +11,11 @@ func StdOutput() *stdoutput {
return &stdoutput{}
}
func (so *stdoutput) Write(str string) error {
func (so *stdoutput) Write(str string, images []Image) error {
fmt.Println(str)
for _, img := range images {
fmt.Printf("[image: %s (%s, %d bytes)]\n", img.Filename, img.ContentType, len(img.Data))
}
return nil
}

51
output/twitter.go
View File

@@ -1,11 +1,14 @@
package output
import (
"bytes"
"context"
"fmt"
"os"
"github.com/michimani/gotwi"
"github.com/michimani/gotwi/media/upload"
uploadtypes "github.com/michimani/gotwi/media/upload/types"
"github.com/michimani/gotwi/tweet/managetweet"
"github.com/michimani/gotwi/tweet/managetweet/types"
)
@@ -41,15 +44,61 @@ func (to *twitteroutput) newOAuth1Client(accessToken, accessSecret string) error
return err
}
func (to *twitteroutput) Write(str string) error {
func (to *twitteroutput) Write(str string, images []Image) error {
mediaIDs := make([]string, 0, len(images))
for _, img := range images {
mediaID, err := to.uploadImage(img)
if err != nil {
return fmt.Errorf("uploading %s: %w", img.Filename, err)
}
mediaIDs = append(mediaIDs, mediaID)
}
p := &types.CreateInput{
Text: gotwi.String(str),
}
if len(mediaIDs) > 0 {
p.Media = &types.CreateInputMedia{
MediaIDs: mediaIDs,
}
}
_, err := managetweet.Create(context.Background(), to.client, p)
return err
}
func (to *twitteroutput) uploadImage(img Image) (string, error) {
ctx := context.Background()
initialized, err := upload.Initialize(ctx, to.client, &uploadtypes.InitializeInput{
MediaCategory: uploadtypes.MediaCategoryTweetImage,
MediaType: uploadtypes.MediaType(img.ContentType),
TotalBytes: len(img.Data),
})
if err != nil {
return "", err
}
mediaID := initialized.Data.MediaID
_, err = upload.Append(ctx, to.client, &uploadtypes.AppendInput{
MediaID: mediaID,
Media: bytes.NewReader(img.Data),
SegmentIndex: 0,
})
if err != nil {
return "", err
}
_, err = upload.Finalize(ctx, to.client, &uploadtypes.FinalizeInput{
MediaID: mediaID,
})
if err != nil {
return "", err
}
return mediaID, nil
}
func (to *twitteroutput) GetName() string {
return "twitter"
}