remove nsfw AI detector thing.

justfile

@@ -7,7 +7,7 @@ build: templ tailwind
     go build -o ./njump
 
 deploy: templ tailwind
-    GOOS=linux GOARCH=amd64 go build -tags=nsfw -ldflags="-X main.compileTimeTs=$(date '+%s')" -o ./njump
+    GOOS=linux GOARCH=amd64 go build -ldflags="-X main.compileTimeTs=$(date '+%s')" -o ./njump
     rsync --progress njump njump:njump/njump-new
     ssh njump 'systemctl stop njump'
     ssh njump 'mv njump/njump-new njump/njump'

nsfw_checker_impl.go

@@ -1,80 +0,0 @@
-//go:build nsfw
-
-package main
-
-import (
-	"fmt"
-	"image/png"
-	"os"
-	"sync"
-
-	"github.com/ccuetoh/nsfw"
-	lru "github.com/hashicorp/golang-lru/v2"
-)
-
-var nsfwCache, _ = lru.New[string, bool](64)
-
-var nsfwPredictor = func() *nsfw.Predictor {
-	p, err := nsfw.NewLatestPredictor()
-	if err != nil {
-		log.Fatal().Err(err).Msg("failed to start keras nsfw detector")
-		return p
-	}
-	log.Info().Msg("keras nsfw detector enabled")
-	return p
-}()
-
-var tempFileLocks = [3]sync.Mutex{{}, {}, {}}
-
-func isImageNSFW(url string) bool {
-	defer func() {
-		if r := recover(); r != nil {
-			log.Error().Interface("err", r).Str("url", url).Msg("panic while checking nsfw")
-			return
-		}
-	}()
-
-	if is, ok := nsfwCache.Get(url); ok {
-		return is
-	}
-
-	img, err := fetchImageFromURL(url)
-	if err != nil {
-		return false // if we can't read it that means it's ok
-	}
-
-	// grab mutex
-	var tempPath string
-	for i, mu := range tempFileLocks {
-		if ok := mu.TryLock(); ok {
-			tempPath = fmt.Sprintf("/tmp/nsfw-detection-%d.png", i)
-			defer mu.Unlock()
-			break
-		}
-	}
-
-	if tempPath == "" {
-		// apparently we can't allocate a temporary file for this, so let's warn and return false
-		log.Warn().Msg("failed to allocate a temp file for nsfw detection")
-		return false
-	}
-
-	tempFile, err := os.Create(tempPath)
-	if err != nil {
-		log.Warn().Err(err).Msg("failed to open a temp file for nsfw detection")
-		return false
-	}
-	if err := png.Encode(tempFile, img); err != nil {
-		log.Warn().Err(err).Msg("failed to encode png for nsfw detection")
-		tempFile.Close()
-		return false
-	}
-	tempFile.Close() // close here so the thing can read it below
-
-	res := nsfwPredictor.Predict(nsfwPredictor.NewImage(tempPath, 3))
-	log.Debug().Str("url", url).Str("desc", res.Describe()).Msg("image analyzed")
-
-	is := res.Porn > 0.85 || res.Hentai > 0.85
-	nsfwCache.Add(url, is)
-	return is
-}

nsfw_checker_noop.go

@@ -1,7 +0,0 @@
-//go:build !nsfw
-
-package main
-
-func isImageNSFW(url string) bool {
-	return false
-}

render_event.go

@@ -111,22 +111,12 @@ func renderEvent(w http.ResponseWriter, r *http.Request) {
 	//
 
 	// if it's porn we return a 404
-	allUrls := urlRegex.FindAllString(data.event.Content, len(data.event.Content)+1)
-	if len(allUrls) > 0 && hasProhibitedWordOrTag(data.event.Event) {
+	hasURL := urlRegex.MatchString(data.event.Content)
+	if hasURL && hasProhibitedWordOrTag(data.event.Event) {
 		log.Warn().Str("event", data.nevent).Msg("detect prohibited porn content")
 		http.Error(w, "event is not allowed", 404)
 		return
 	}
-	for _, url := range allUrls {
-		url = strings.Split(strings.Split(url, "?")[0], "#")[0]
-		if imageExtensionMatcher.MatchString(url) {
-			if isImageNSFW(url) {
-				log.Warn().Str("url", url).Str("event", data.nevent).Msg("detect nsfw image")
-				http.Error(w, "event is unsuitable for work", 404)
-				return
-			}
-		}
-	}
 
 	// gather page style from user-agent
 	style := getPreviewStyle(r)