Send Media Message

//native

/**

 * Send Media Message

 * Send an image, video, audio, document or sticker message to a WhatsApp user, referenced by an uploaded media ID or a public URL.

 */

export async function main(

  auth: RT.WhatsappBusiness,

  to: string,

  media_type: "image" | "video" | "audio" | "document" | "sticker",

  media_id: string | undefined,

  media_link: string | undefined,

  caption: string | undefined,

  filename: string | undefined

) {

  const apiVersion = auth.api_version || "v25.0"

  const url = new URL(

    `https://graph.facebook.com/${apiVersion}/${auth.phone_number_id}/messages`

  )

  const media: { [key: string]: any } = {}

  if (media_id !== undefined && media_id !== "") {

    media.id = media_id

  } else if (media_link !== undefined && media_link !== "") {

    media.link = media_link

  } else {

    throw new Error("Either media_id or media_link must be provided")

  }

  // caption is only honored on image, video and document; filename only on document

  if (

    caption !== undefined &&

    caption !== "" &&

    (media_type === "image" ||

      media_type === "video" ||

      media_type === "document")

  ) {

    media.caption = caption

  }

  if (filename !== undefined && filename !== "" && media_type === "document") {

    media.filename = filename

  }

  const response = await fetch(url, {

    method: "POST",

    headers: {

      Authorization: `Bearer ${auth.token}`,

      "Content-Type": "application/json",

      Accept: "application/json",

    },

    body: JSON.stringify({

      messaging_product: "whatsapp",

      recipient_type: "individual",

      to,

      type: media_type,

      [media_type]: media,

    }),

  })

  if (!response.ok) {

    throw new Error(`${response.status} ${await response.text()}`)

  }

  return await response.json()

}