catbase/plugins/meme/meme.go

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package meme
import (
"bytes"
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"encoding/json"
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"fmt"
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"image"
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"image/color"
"image/draw"
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"image/png"
"net/http"
"net/url"
"path"
"regexp"
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"strings"
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"time"
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"github.com/fogleman/gg"
"github.com/google/uuid"
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"github.com/nfnt/resize"
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"github.com/rs/zerolog/log"
"github.com/velour/catbase/bot"
"github.com/velour/catbase/bot/msg"
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"github.com/velour/catbase/bot/user"
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"github.com/velour/catbase/config"
)
type MemePlugin struct {
bot bot.Bot
c *config.Config
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images cachedImages
}
type cachedImage struct {
created time.Time
repr []byte
}
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type memeText struct {
XPerc float64 `json:"x"`
YPerc float64 `json:"y"`
Text string `json:"t"`
}
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var horizon = 24 * 7
type cachedImages map[string]*cachedImage
func (ci cachedImages) cleanup() {
for key, img := range ci {
if time.Now().After(img.created.Add(time.Hour * time.Duration(horizon))) {
delete(ci, key)
}
}
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}
func New(b bot.Bot) *MemePlugin {
mp := &MemePlugin{
bot: b,
c: b.Config(),
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images: make(cachedImages),
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}
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horizon = mp.c.GetInt("meme.horizon", horizon)
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b.Register(mp, bot.Message, mp.message)
b.Register(mp, bot.Help, mp.help)
mp.registerWeb(b.DefaultConnector())
return mp
}
var cmdMatch = regexp.MustCompile(`(?i)meme (.+)`)
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func (p *MemePlugin) message(c bot.Connector, kind bot.Kind, message msg.Message, args ...interface{}) bool {
if message.Command && cmdMatch.MatchString(message.Body) {
subs := cmdMatch.FindStringSubmatch(message.Body)
if len(subs) != 2 {
p.bot.Send(c, bot.Message, message.Channel, "Invalid meme request.")
return true
}
minusMeme := subs[1]
p.sendMeme(c, message.Channel, message.ChannelName, message.ID, message.User, minusMeme)
return true
}
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return false
}
func (p *MemePlugin) help(c bot.Connector, kind bot.Kind, message msg.Message, args ...interface{}) bool {
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webRoot := p.c.Get("BaseURL", "https://catbase.velour.ninja")
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formats := p.c.GetMap("meme.memes", defaultFormats)
msg := "Use `/meme [format] [text]` to create a meme.\nI know the following formats:"
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msg += "\n`[format]` can be a URL"
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msg += fmt.Sprintf("\nor a format from the list of %d pre-made memes listed on the website", len(formats))
msg += fmt.Sprintf("\nHead over to %s/meme to view and add new meme formats", webRoot)
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msg += "\nYou can use `_` as a placeholder for empty text and a newline (|| on Discord) to separate top vs bottom."
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msg += "\nOR you can configure the text yourself with JSON. Send a code quoted message like:"
msg += "```/meme doge `[{\"x\": 0.2, \"y\": 0.1, \"t\": \"such image\"},{\"x\": 0.7, \"y\": 0.5, \"t\": \"much meme\"},{\"x\": 0.4, \"y\": 0.8, \"t\": \"wow\"}]` ```"
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p.bot.Send(c, bot.Message, message.Channel, msg)
return true
}
func (p *MemePlugin) registerWeb(c bot.Connector) {
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http.HandleFunc("/slash/meme", p.slashMeme(c))
http.HandleFunc("/meme/img/", p.img)
http.HandleFunc("/meme/all", p.all)
http.HandleFunc("/meme/add", p.addMeme)
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http.HandleFunc("/meme/rm", p.rmMeme)
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http.HandleFunc("/meme", p.webRoot)
p.bot.RegisterWeb("/meme", "Memes")
}
type webResp struct {
Name string `json:"name"`
URL string `json:"url"`
}
type webResps []webResp
func (w webResps) Len() int { return len(w) }
func (w webResps) Swap(i, j int) { w[i], w[j] = w[j], w[i] }
type ByName struct{ webResps }
func (s ByName) Less(i, j int) bool { return s.webResps[i].Name < s.webResps[j].Name }
func (p *MemePlugin) bully(c bot.Connector, format, id string) image.Image {
bullyIcon := ""
for _, bully := range p.c.GetArray("meme.bully", []string{}) {
if format == bully {
if u, err := c.Profile(bully); err == nil {
bullyIcon = u.Icon
} else {
log.Debug().Err(err).Msgf("could not get profile for %s", format)
}
formats := p.c.GetMap("meme.memes", defaultFormats)
format = randEntry(formats)
break
}
}
if u, err := c.Profile(id); bullyIcon == "" && err == nil {
if u.IconImg != nil {
return u.IconImg
}
bullyIcon = u.Icon
}
u, err := url.Parse(bullyIcon)
if err != nil {
log.Error().Err(err).Msg("error with bully URL")
}
bullyImg, err := DownloadTemplate(u)
if err != nil {
log.Error().Err(err).Msg("error downloading bully icon")
}
return bullyImg
}
func (p *MemePlugin) sendMeme(c bot.Connector, channel, channelName, msgID string, from *user.User, text string) {
parts := strings.SplitN(text, " ", 2)
if len(parts) != 2 {
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log.Debug().Msgf("Bad meme request: %v, %v", from, text)
p.bot.Send(c, bot.Message, channel, fmt.Sprintf("%v tried to send me a bad meme request.", from.Name))
return
}
isCmd, message := bot.IsCmd(p.c, parts[1])
format := parts[0]
log.Debug().Strs("parts", parts).Msgf("Meme:\n%+v", text)
go func() {
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var config []memeText
message = strings.TrimPrefix(message, "`")
message = strings.TrimSuffix(message, "`")
err := json.Unmarshal([]byte(message), &config)
if err == nil {
message = ""
for _, c := range config {
message += c.Text + "\n"
}
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} else {
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top, bottom := "", message
if strings.Contains(message, "||") {
parts = strings.Split(message, "||")
} else {
parts = strings.Split(message, "\n")
}
if len(parts) > 1 {
top, bottom = parts[0], parts[1]
}
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if top == "_" {
message = bottom
} else if bottom == "_" {
message = top
}
topPos := p.bot.Config().GetFloat64("meme.top", 0.05)
bottomPos := p.bot.Config().GetFloat64("meme.bottom", 0.95)
config = []memeText{
{Text: top, XPerc: 0.5, YPerc: topPos},
{Text: bottom, XPerc: 0.5, YPerc: bottomPos},
}
}
bullyImg := p.bully(c, format, from.ID)
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id, w, h, err := p.genMeme(format, bullyImg, config)
if err != nil {
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msg := fmt.Sprintf("Hey %v, I couldn't download that image you asked for.", from.Name)
p.bot.Send(c, bot.Message, channel, msg)
return
}
baseURL := p.c.Get("BaseURL", ``)
u, _ := url.Parse(baseURL)
u.Path = path.Join(u.Path, "meme", "img", id)
log.Debug().Msgf("image is at %s", u.String())
_, err = p.bot.Send(c, bot.Message, channel, "", bot.ImageAttachment{
URL: u.String(),
AltTxt: fmt.Sprintf("%s: %s", from.Name, message),
Width: w,
Height: h,
})
if err == nil && msgID != "" {
p.bot.Send(c, bot.Delete, channel, msgID)
}
m := msg.Message{
User: &user.User{
ID: from.ID,
Name: from.Name,
Admin: false,
},
Channel: channel,
ChannelName: channelName,
Body: message,
Command: isCmd,
Time: time.Now(),
}
p.bot.Receive(c, bot.Message, m)
}()
}
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func (p *MemePlugin) slashMeme(c bot.Connector) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
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r.ParseForm()
log.Debug().Msgf("Meme:\n%+v", r.PostForm.Get("text"))
channel := r.PostForm.Get("channel_id")
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channelName := r.PostForm.Get("channel_name")
from := r.PostForm.Get("user_name")
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text := r.PostForm.Get("text")
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log.Debug().Msgf("channel: %s", channel)
user := &user.User{
ID: from, // HACK but should work fine
Name: from,
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}
p.sendMeme(c, channel, channelName, "", user, text)
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w.WriteHeader(200)
w.Write(nil)
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}
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}
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func randEntry(m map[string]string) string {
for _, e := range m {
return e
}
return ""
}
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func DownloadTemplate(u *url.URL) (image.Image, error) {
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res, err := http.Get(u.String())
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if err != nil {
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log.Error().Msgf("template from %s failed because of %v", u.String(), err)
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return nil, err
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}
defer res.Body.Close()
image, _, err := image.Decode(res.Body)
if err != nil {
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log.Error().Msgf("Could not decode %v because of %v", u, err)
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return nil, err
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}
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return image, nil
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}
var defaultFormats = map[string]string{
"fry": "Futurama-Fry.jpg",
"aliens": "Ancient-Aliens.jpg",
"doge": "Doge.jpg",
"simply": "One-Does-Not-Simply.jpg",
"wonka": "Creepy-Condescending-Wonka.jpg",
"grumpy": "Grumpy-Cat.jpg",
"raptor": "Philosoraptor.jpg",
}
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func (p *MemePlugin) findFontSize(config []memeText, w, h int, sizes []float64) float64 {
fontSize := 12.0
m := gg.NewContext(w, h)
fontLocation := p.c.Get("meme.font", "impact.ttf")
longestStr, longestW := "", 0.0
for _, s := range config {
err := m.LoadFontFace(fontLocation, 12) // problem
if err != nil {
log.Error().Err(err).Msg("could not load font")
return fontSize
}
w, _ := m.MeasureString(s.Text)
if w > longestW {
longestStr = s.Text
longestW = w
}
}
for _, sz := range sizes {
err := m.LoadFontFace(fontLocation, sz) // problem
if err != nil {
log.Error().Err(err).Msg("could not load font")
return fontSize
}
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topW, _ := m.MeasureString(longestStr)
if topW < float64(w) {
fontSize = sz
break
}
}
return fontSize
}
func (p *MemePlugin) genMeme(meme string, bully image.Image, config []memeText) (string, int, int, error) {
fontSizes := []float64{48, 36, 24, 16, 12}
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formats := p.c.GetMap("meme.memes", defaultFormats)
path := uuid.New().String()
imgName, ok := formats[meme]
if !ok {
imgName = meme
}
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u, err := url.Parse(imgName)
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if err != nil || u.Scheme == "" {
log.Debug().Err(err).Str("imgName", imgName).Msgf("url not detected")
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u, _ = url.Parse("https://imgflip.com/s/meme/" + imgName)
}
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log.Debug().Msgf("Attempting to download url: %s", u.String())
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img, err := DownloadTemplate(u)
if err != nil {
log.Debug().Msgf("failed to download image: %s", err)
return "", 0, 0, err
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}
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r := img.Bounds()
w := r.Dx()
h := r.Dy()
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// /meme2 5guys [{"x": 0.1, "y": 0.1, "t": "test"}]
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maxSz := p.c.GetFloat64("maxImgSz", 750.0)
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if w > h {
scale := maxSz / float64(w)
w = int(float64(w) * scale)
h = int(float64(h) * scale)
} else {
scale := maxSz / float64(h)
w = int(float64(w) * scale)
h = int(float64(h) * scale)
}
log.Debug().Msgf("trynig to resize to %v, %v", w, h)
img = resize.Resize(uint(w), uint(h), img, resize.Lanczos3)
r = img.Bounds()
w = r.Dx()
h = r.Dy()
log.Debug().Msgf("resized to %v, %v", w, h)
if bully != nil {
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img = p.applyBully(img, bully)
}
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m := gg.NewContext(w, h)
m.DrawImage(img, 0, 0)
fontLocation := p.c.Get("meme.font", "impact.ttf")
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m.LoadFontFace(fontLocation, p.findFontSize(config, w, h, fontSizes))
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// Apply black stroke
m.SetHexColor("#000")
strokeSize := 6
for dy := -strokeSize; dy <= strokeSize; dy++ {
for dx := -strokeSize; dx <= strokeSize; dx++ {
// give it rounded corners
if dx*dx+dy*dy >= strokeSize*strokeSize {
continue
}
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for _, c := range config {
x := float64(w)*c.XPerc + float64(dx)
y := float64(h)*c.YPerc + float64(dy)
m.DrawStringAnchored(c.Text, x, y, 0.5, 0.5)
}
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}
}
// Apply white fill
m.SetHexColor("#FFF")
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for _, c := range config {
x := float64(w) * c.XPerc
y := float64(h) * c.YPerc
m.DrawStringAnchored(c.Text, x, y, 0.5, 0.5)
}
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i := bytes.Buffer{}
png.Encode(&i, m.Image())
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p.images[path] = &cachedImage{time.Now(), i.Bytes()}
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log.Debug().Msgf("Saved to %s\n", path)
return path, w, h, nil
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}
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func (p *MemePlugin) applyBully(img, bullyImg image.Image) image.Image {
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dst := image.NewRGBA(img.Bounds())
scaleFactor := p.c.GetFloat64("meme.bullyScale", 0.1)
scaleFactor = float64(img.Bounds().Max.X) * scaleFactor / float64(bullyImg.Bounds().Max.X)
newSzX := uint(float64(bullyImg.Bounds().Max.X) * scaleFactor)
newSzY := uint(float64(bullyImg.Bounds().Max.Y) * scaleFactor)
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bullyImg = resize.Resize(newSzX, newSzY, bullyImg, resize.Lanczos3)
draw.Draw(dst, img.Bounds(), img, image.Point{}, draw.Src)
srcSz := img.Bounds().Size()
w, h := bullyImg.Bounds().Max.X, bullyImg.Bounds().Max.Y
pt := image.Point{srcSz.X - w, srcSz.Y - h}
rect := image.Rect(pt.X, pt.Y, srcSz.X, srcSz.Y)
draw.DrawMask(dst, rect, bullyImg, image.Point{}, &circle{image.Point{w / 2, h / 2}, w / 2}, image.Point{}, draw.Over)
return dst
}
// the following is ripped off of https://blog.golang.org/image-draw
type circle struct {
p image.Point
r int
}
func (c *circle) ColorModel() color.Model {
return color.AlphaModel
}
func (c *circle) Bounds() image.Rectangle {
return image.Rect(c.p.X-c.r, c.p.Y-c.r, c.p.X+c.r, c.p.Y+c.r)
}
func (c *circle) At(x, y int) color.Color {
xx, yy, rr := float64(x-c.p.X)+0.5, float64(y-c.p.Y)+0.5, float64(c.r)
if xx*xx+yy*yy < rr*rr {
return color.Alpha{255}
}
return color.Alpha{0}
}