feat: implement episode image fallback for banned youtube icons

integrations/jikan/episodes.go

@@ -3,9 +3,79 @@ package jikan
 import (
 	"context"
 	"fmt"
+	"io"
+	"net/http"
+	"regexp"
+	"strconv"
+	"strings"
 	"time"
 )
 
+const bannedImageURL = "https://myanimelist.net/images/icon-banned-youtube.png"
+
+var httpClient = &http.Client{Timeout: 10 * time.Second}
+
+func (e *Episode) GetFallbackImage(animeID int) string {
+	if e.Images == nil || e.Images.Jpg.ImageURL != bannedImageURL {
+		return e.Images.Jpg.ImageURL
+	}
+
+	episodeNum := 1
+	if e.Episode != "" {
+		episodeNum, _ = strconv.Atoi(e.Episode)
+	}
+
+	episodeURL := fmt.Sprintf("https://myanimelist.net/anime/%d/episode/%d", animeID, episodeNum)
+	fallbackURL := scrapeAnimeImageFromEpisodePage(episodeURL, episodeNum)
+	if fallbackURL != "" {
+		return fallbackURL
+	}
+
+	return e.Images.Jpg.ImageURL
+}
+
+func scrapeAnimeImageFromEpisodePage(episodeURL string, episodeNum int) string {
+	req, err := http.NewRequest("GET", episodeURL, nil)
+	if err != nil {
+		return ""
+	}
+	// Setting User-Agent is important for MAL
+	req.Header.Set("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36")
+
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return ""
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != 200 {
+		return ""
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return ""
+	}
+
+	html := string(body)
+
+	// Look for the JSON data in MAL.episodeVideo.aroundVideos
+	// We extract the object {} containing "episode_number":X
+	episodeStr := strconv.Itoa(episodeNum)
+	objPattern := regexp.MustCompile(`\{[^{}]*"episode_number":\s*` + episodeStr + `[^{}]*\}`)
+	match := objPattern.FindString(html)
+	if match != "" {
+		thumbRe := regexp.MustCompile(`"thumbnail":\s*"([^"]+)"`)
+		thumbMatch := thumbRe.FindStringSubmatch(match)
+		if len(thumbMatch) > 1 {
+			// Unescape backslashes in URL
+			return strings.ReplaceAll(thumbMatch[1], `\/`, `/`)
+		}
+	}
+
+	return ""
+}
+
 func (c *Client) GetEpisodes(ctx context.Context, animeID int, page int) (EpisodesResponse, error) {
 	if page < 1 {
 		page = 1