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package main
import (
"context"
"embed"
"flag"
"fmt"
"io"
"io/fs"
"log"
"log/slog"
"net/http"
"strings"
"sync"
"time"
"github.com/a-h/templ"
"github.com/aws/aws-sdk-go-v2/aws"
v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
awsConfig "github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/s3"
"within.website/x/htmx"
"within.website/x/internal"
"within.website/x/xess"
)
//go:generate go tool templ generate
var (
bind = flag.String("bind", ":3923", "TCP address to bind to")
bucketName = flag.String("bucket-name", "xedn", "Bucket to pull from")
folderName = flag.String("folder-name", "stickers", "Folder name for stickers")
//go:embed data/*
static embed.FS
cache = map[string]struct{}{}
cacheLock = sync.RWMutex{}
)
func main() {
internal.HandleStartup()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
cfg, err := awsConfig.LoadDefaultConfig(ctx)
if err != nil {
log.Fatal(err)
}
s3c := s3.NewFromConfig(cfg, func(o *s3.Options) {
o.UsePathStyle = true
})
presigner := Presigner{s3.NewPresignClient(s3c)}
_ = presigner
mux := http.NewServeMux()
htmx.Mount(mux)
xess.Mount(mux)
mux.HandleFunc("GET /{$}", func(w http.ResponseWriter, r *http.Request) {
character := r.FormValue("character")
mood := r.FormValue("mood")
templ.Handler(
xess.Simple("Sticker Tester", index(character, mood)),
).ServeHTTP(w, r)
})
mux.HandleFunc("GET /sticker/{name}/{mood}", func(w http.ResponseWriter, r *http.Request) {
acc := strings.Split(r.Header.Get("Accept"), ",")
name := r.PathValue("name")
mood := r.PathValue("mood")
format := "png"
for _, acceptFormat := range acc {
_, theirFormat, ok := strings.Cut(acceptFormat, "image/")
if !ok {
continue
}
switch theirFormat {
case "avif", "webp":
format = theirFormat
}
}
key := fmt.Sprintf("%s/%s/%s.%s", *folderName, name, mood, format)
if !inCache(name, mood) {
_, err := s3c.HeadObject(r.Context(), &s3.HeadObjectInput{
Bucket: aws.String(*bucketName),
Key: aws.String(key),
})
if err != nil {
slog.Error("can't head key", "format", format, "bucket", *bucketName, "key", key, "err", err)
st, err := fs.Stat(static, "data/not_found."+format)
if err != nil {
http.Error(w, "internal stat error, sorry", http.StatusInternalServerError)
return
}
fin, err := static.Open("data/not_found." + format)
if err != nil {
http.Error(w, "internal fopen error, sorry", http.StatusInternalServerError)
return
}
defer fin.Close()
w.Header().Add("Content-Length", fmt.Sprint(st.Size()))
w.Header().Add("Content-Type", "image/"+format)
w.WriteHeader(http.StatusNotFound)
io.Copy(w, fin)
return
}
setCache(name, mood)
}
req, err := presigner.GetObject(r.Context(), key, 3600)
if err != nil {
slog.Error("can't presign get for key", "format", format, "bucket", *bucketName, "key", key, "err", err)
st, err := fs.Stat(static, "data/error."+format)
if err != nil {
http.Error(w, "internal stat error, sorry", http.StatusInternalServerError)
return
}
fin, err := static.Open("data/error." + format)
if err != nil {
http.Error(w, "internal fopen error, sorry", http.StatusInternalServerError)
return
}
defer fin.Close()
w.Header().Add("Content-Length", fmt.Sprint(st.Size()))
w.Header().Add("Content-Type", "image/"+format)
w.WriteHeader(http.StatusInternalServerError)
io.Copy(w, fin)
return
}
w.Header().Add("Cache-Control", "max-age=3599")
w.Header().Add("Expires", time.Now().Add(time.Hour-time.Second).Format(http.TimeFormat))
http.Redirect(w, r, req.URL, http.StatusTemporaryRedirect)
})
slog.Info("listening", "bind", *bind)
log.Fatal(http.ListenAndServe(*bind, mux))
}
// Presigner encapsulates the Amazon Simple Storage Service (Amazon S3) presign actions
// used in the examples.
// It contains PresignClient, a client that is used to presign requests to Amazon S3.
// Presigned requests contain temporary credentials and can be made from any HTTP client.
type Presigner struct {
PresignClient *s3.PresignClient
}
// GetObject makes a presigned request that can be used to get an object from a bucket.
// The presigned request is valid for the specified number of seconds.
func (presigner Presigner) GetObject(
ctx context.Context,
objectKey string,
lifetimeSecs int64,
) (*v4.PresignedHTTPRequest, error) {
request, err := presigner.PresignClient.PresignGetObject(ctx, &s3.GetObjectInput{
Bucket: aws.String(*bucketName),
Key: aws.String(objectKey),
}, func(opts *s3.PresignOptions) {
opts.Expires = time.Duration(lifetimeSecs * int64(time.Second))
})
if err != nil {
log.Printf("Couldn't get a presigned request to get %v:%v. Here's why: %v\n",
bucketName, objectKey, err)
}
return request, err
}
func inCache(character, mood string) bool {
cacheLock.RLock()
defer cacheLock.RUnlock()
_, ok := cache[character+" "+mood]
return ok
}
func setCache(character, mood string) {
cacheLock.Lock()
defer cacheLock.Unlock()
cache[character+" "+mood] = struct{}{}
}
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