Autotag scraper (#1817)

* Refactor scraper structures
* Move matching code into new package
* Add autotag scraper
* Always check first letter of auto-tag names
* Account for nulls

Co-authored-by: Kermie <kermie@isinthe.house>

pkg/scraper/scraper.go

@@ -0,0 +1,51 @@
+package scraper
+
+import "github.com/stashapp/stash/pkg/models"
+
+type urlMatcher interface {
+	matchesURL(url string) bool
+}
+
+type performerScraper interface {
+	scrapeByName(name string) ([]*models.ScrapedPerformer, error)
+	scrapeByFragment(scrapedPerformer models.ScrapedPerformerInput) (*models.ScrapedPerformer, error)
+	scrapeByURL(url string) (*models.ScrapedPerformer, error)
+}
+
+type sceneScraper interface {
+	scrapeByName(name string) ([]*models.ScrapedScene, error)
+	scrapeByScene(scene *models.Scene) (*models.ScrapedScene, error)
+	scrapeByFragment(scene models.ScrapedSceneInput) (*models.ScrapedScene, error)
+	scrapeByURL(url string) (*models.ScrapedScene, error)
+}
+
+type galleryScraper interface {
+	scrapeByGallery(gallery *models.Gallery) (*models.ScrapedGallery, error)
+	scrapeByFragment(gallery models.ScrapedGalleryInput) (*models.ScrapedGallery, error)
+	scrapeByURL(url string) (*models.ScrapedGallery, error)
+}
+
+type movieScraper interface {
+	scrapeByURL(url string) (*models.ScrapedMovie, error)
+}
+
+type scraper struct {
+	ID   string
+	Spec *models.Scraper
+
+	Performer performerScraper
+	Scene     sceneScraper
+	Gallery   galleryScraper
+	Movie     movieScraper
+}
+
+func matchesURL(maybeURLMatcher interface{}, url string) bool {
+	if maybeURLMatcher != nil {
+		matcher, ok := maybeURLMatcher.(urlMatcher)
+		if ok {
+			return matcher.matchesURL(url)
+		}
+	}
+
+	return false
+}