✨ Be able to lookup sticker via thier pack prefix + alias

pkg/internal/server/api/index.go

@@ -23,6 +23,7 @@ func MapAPIs(app *fiber.App, baseURL string) {
 		api.Post("/attachments/multipart", createAttachmentMultipartPlaceholder)
 		api.Post("/attachments/multipart/:file/:chunk", uploadAttachmentMultipart)
 
+		api.Get("/stickers/lookup/:alias", lookupSticker)
 		api.Get("/stickers/manifest", listStickerManifest)
 		api.Get("/stickers/packs", listStickerPacks)
 		api.Post("/stickers/packs", createStickerPack)

pkg/internal/server/api/stickers_api.go

@@ -12,6 +12,15 @@ import (
 	"github.com/gofiber/fiber/v2"
 )
 
+func lookupSticker(c *fiber.Ctx) error {
+	alias := c.Params("alias")
+	if sticker, err := services.GetStickerWithAlias(alias); err != nil {
+		return fiber.NewError(fiber.StatusNotFound, err.Error())
+	} else {
+		return c.JSON(sticker)
+	}
+}
+
 func listStickers(c *fiber.Ctx) error {
 	take := c.QueryInt("take", 0)
 	offset := c.QueryInt("offset", 0)