feat: Improve error text for multiple api urls

locales/en.ftl

@@ -6,6 +6,7 @@ error-not-url = doesn't look like a url to me
 error-request-not-found = looks like i forgot your link, try sending it again
 error-not-button-owner = looks like this button is not yours (¬_¬")
 error-too-large = sorry, but this file is too big - telegram doesn't allow me to upload it
+error-invalid-response = server response is invalid, maybe it's down or encountered an internal error
 error-unknown = oops, an internal error happened. i reported it to my develeoper, so they'll fix it!
 
 download-title = download from provided url

locales/ru.ftl

@@ -6,6 +6,7 @@ error-not-url = не похоже на ссылку
 error-request-not-found = похоже я потерял твою ссылку, можешь отправить её снова?
 error-not-button-owner = похоже что эта кнопка не твоя (¬_¬")
 error-too-large = этот файл слишком большой, к сожалению тг не даёт его загрузить
+error-invalid-response = сервер некорректно ответил, возможно он столкнулся с внутренней ошибкой или лежит
 error-unknown = ой, произошла внутреняя ошибка. я сообщил об этом моим разаработчикам, чтобы они исправили!
 
 download-title = скачать по ссылке

src/handler.ts

@@ -71,7 +71,7 @@ export const handleMediaDownload = async (
         isAudioOnly: outputType === "audio",
         lang,
     })
-    if (res.status === "error") return error(literal(res.text))
+    if (res.status === "fail") return error(res.fails)
 
     if (res.status === "stream") {
         const data = await fetchStream(res.url)

src/request.ts

@@ -1,5 +1,6 @@
 import { z } from "zod"
 import { env } from "#env"
+import { Text, literal, translatable, compound } from "#text"
 
 const genericErrorSchema = z.object({
     status: z.literal("error"),
@@ -30,20 +31,30 @@ const mediaResponseSchema = z.discriminatedUnion("status", [
     genericErrorSchema,
 ])
 
+type FailResponse = {
+    status: "fail",
+    fails: Text,
+}
+
+type FetchMediaResponse =
+    Exclude<z.infer<typeof mediaResponseSchema>, z.infer<typeof genericErrorSchema>> | FailResponse
 export const fetchMedia = async (
     { url, lang, isAudioOnly = false, fails = [] }: {
         url: string,
         lang?: string,
         isAudioOnly?: boolean,
-        fails?: string[],
+        fails?: Text[],
     },
-): Promise<z.infer<typeof mediaResponseSchema>> => {
+): Promise<FetchMediaResponse> => {
     if (fails.length >= env.API_BASE_URL.length)
-        throw new Error(`fetch failed with ${fails}`)
+        return {
+            status: "fail",
+            fails: compound(...fails),
+        }
 
     const currentBaseUrl = env.API_BASE_URL[fails.length]
-    const next = async (reason: string) => await fetchMedia(
-        { url, lang, isAudioOnly, fails: [...fails, `${currentBaseUrl} - ${reason}`] },
+    const next = async (reason: Text) => await fetchMedia(
+        { url, lang, isAudioOnly, fails: [...fails, compound(literal(`\n${currentBaseUrl} - `), reason)] },
     )
 
     const res = await fetch(`${currentBaseUrl}/json`, {
@@ -55,11 +66,11 @@ export const fetchMedia = async (
         ],
         body: JSON.stringify({ url, isAudioOnly, filenamePattern: "basic", isNoTTWatermark: true }),
     })
-    if (!res.ok) return next(`not ok (${res.status})`)
 
     const body = await res.json().catch(() => null)
     const data = mediaResponseSchema.safeParse(body)
-    if (!data.success) return next("invalid response body")
+    if (!data.success) return next(translatable("error-invalid-response"))
+    if (data.data.status === "error") return next(literal(data.data.text))
 
     return data.data
 }

src/text.ts

@@ -11,18 +11,25 @@ export type TranslatableText = {
     key: string,
 }
 
+export type CompoundText = {
+    type: "compound",
+    content: Text[],
+}
+
 export type TextFlavor = {
     evaluateText: (text: Text) => string,
 }
 
-export type Text = LiteralText | TranslatableText
+export type Text = LiteralText | TranslatableText | CompoundText
 
 export const literal = (text: string): LiteralText => ({ type: "literal", text })
 export const translatable = (key: string): TranslatableText => ({ type: "translatable", key })
+export const compound = (...content: Text[]): CompoundText => ({ type: "compound", content })
 export const textMiddleware: MiddlewareFn<Context & I18nFlavor & TextFlavor> = async (ctx, next) => {
     ctx.evaluateText = (text: Text): string => {
         if (text.type === "literal") return text.text
         if (text.type === "translatable") return ctx.t(text.key)
+        if (text.type === "compound") return text.content.map(t => ctx.evaluateText(t)).join("")
         return ""
     }
     await next()