make http:sticker/id basic usable

src/main/scala/cc/sukazyo/cono/morny/core/http/api/HttpStatus.scala

@@ -2,23 +2,45 @@ package cc.sukazyo.cono.morny.core.http.api
 
 import cats.effect.IO
 import cc.sukazyo.cono.morny.data.TelegramImages
+import cc.sukazyo.cono.morny.util.StringEnsure.firstLine
 import cc.sukazyo.cono.morny.util.UseThrowable.toLogString
 import org.http4s.{Header, MediaType, Response}
 import org.http4s.dsl.io.*
 import org.http4s.headers.`Content-Type`
 
+import java.net.URLEncoder
+import java.nio.charset.StandardCharsets
+
+object HttpStatus extends HttpStatus
+
 trait HttpStatus {
 	
 	private type ResponseT = Response[IO]
 	private type ResponseIO = IO[ResponseT]
 	
 	extension (response: ResponseT) {
+		
+		
 		def setMornyInternalErrorHeader (e: Throwable): ResponseT =
 			response.setMornyInternalErrorHeader(
-				e.getClass.getSimpleName,
-				e.getMessage,
-				e.toLogString
+				e.getClass.getSimpleName.firstLine,
+				e.getMessage.firstLine,
+				URLEncoder.encode(e.toLogString, StandardCharsets.UTF_8) // todo: maybe extract this const
 			)
+		
+		/** Set HTTP Header that shows Morny's Internal Server Error related information.
+		  *
+		  * It will set the following headers, corresponding to this method's parameters, you
+		  * can customize those values.
+		  *   - Morny-Internal-Error-Type
+		  *   - Morny-Internal-Error-Message
+		  *   - Morny-Internal-Error-Detail
+		  *
+		  * **Notice that ANY header value MUST NOT contains line breaking!** Or it will only
+		  * returns an empty 500 response.
+		  *
+		  * @return the [[ResponseT]], with above headers added.
+		  */
 		def setMornyInternalErrorHeader (
 			`Morny-Internal-Error-Type`: String,
 			`Morny-Internal-Error-Message`: String,

src/main/scala/cc/sukazyo/cono/morny/stickers_get/StickerType.scala

@@ -0,0 +1,24 @@
+package cc.sukazyo.cono.morny.stickers_get
+
+import java.nio.charset.StandardCharsets
+
+enum StickerType {
+	case WEBP
+	case WEBM
+	case PNG
+}
+
+object StickerType {
+	
+	class UnknownStickerTypeException (message: String)
+		extends Exception (s"Unknown sticker type: $message")
+	
+//	@throws[UnknownStickerTypeException]
+	def check (stickerFile: Array[Byte]): StickerType =
+		val header = new String(stickerFile.take(50), StandardCharsets.UTF_8)
+		if header.contains("WEBP") then WEBP
+		else if header.contains("webm") then WEBM
+		else if header.contains("PNG") then PNG
+		else throw UnknownStickerTypeException("Unable to infer file type.")
+	
+}

src/main/scala/cc/sukazyo/cono/morny/stickers_get/http/StickerService.scala

@@ -3,12 +3,15 @@ package cc.sukazyo.cono.morny.stickers_get.http
 import cats.effect.IO
 import cc.sukazyo.cono.morny.core.http.api.HttpService4Api
 import cc.sukazyo.cono.morny.core.MornyCoeur
+import cc.sukazyo.cono.morny.stickers_get.StickerType
+import cc.sukazyo.cono.morny.stickers_get.StickerType.UnknownStickerTypeException
 import cc.sukazyo.cono.morny.util.tgapi.TelegramExtensions.File.getContent
 import cc.sukazyo.cono.morny.util.tgapi.TelegramExtensions.Requests.execute
 import com.pengrad.telegrambot.request.GetFile
 import com.pengrad.telegrambot.TelegramBot
-import org.http4s.HttpRoutes
+import org.http4s.{HttpRoutes, MediaType}
 import org.http4s.dsl.io.*
+import org.http4s.headers.`Content-Type`
 
 import java.io.IOException
 
@@ -23,8 +26,16 @@ class StickerService (using coeur: MornyCoeur) extends HttpService4Api {
 					try {
 						given TelegramBot = coeur.account
 						val file = response.file.getContent
+						val file_type: MediaType = StickerType.check(file) match
+							case StickerType.WEBP => MediaType.image.webp
+							case StickerType.WEBM => MediaType.video.webm
+							case StickerType.PNG => MediaType.image.png
 						Ok(file)
+							.map(_.withContentType(`Content-Type`(file_type)))
 					} catch {
+						case e: UnknownStickerTypeException =>
+							MornyInternalServerError()
+								.map(_.setMornyInternalErrorHeader(e))
 						case e: IOException =>
 							MornyServiceUnavailable()
 								.map(_.setMornyInternalErrorHeader(e))

src/main/scala/cc/sukazyo/cono/morny/util/StringEnsure.scala

@@ -4,6 +4,14 @@ object StringEnsure {
 	
 	extension (str: String) {
 		
+		/** Take the first line of this String.
+		  *
+		  * It will find the first `\n` (unicode 0x0a, aka. LF) or `\n` (unicode 0x0e, aka. CR)
+		  * and take all the chars before it, and ignores all the contents after it.
+		  */
+		def firstLine : String =
+			str.takeWhile(c => (c != '\n') && (c != '\r'))
+		
 		/** Ensure the string have a length not smaller that the given length.
 		  * 
 		  * If the length of the string is smaller than the given length, then the string will be padded