feat: filename 倒序，方便在 folder 中查看

docs/dev-log.md

@@ -1,3 +1,18 @@
+## FIXME: bug: 无法发送 20 分钟的长视频
+
+![bug log: 无法发送 20 分钟的长视频](./bug_log_发送20分钟长视频.png)
+
+> Bots can currently send video files of up to 50 MB in size, this limit may be changed in the future.
+> Check the documentation of this method in https://core.telegram.org/bots/api#sendvideo
+
+## 2024-07-22 x.com 无法下载图片 tweet
+
+like: https://x.com/magnum_d1ngus/status/1815029025984643510?s=46
+
+## ex_gram message struct
+
+![ex_gram message struct](ex_gram_input.png)
+
 # ins response
 
 ```elixir

docs/todos.md

@@ -1,5 +1,15 @@
 # Todos
 
+- [ ] list all ins response
+  - [ ] image
+  - [ ] images
+  - [ ] video
+  - [ ] videos
+  - [ ] images and videos
+  - [ ] with url I should download?
+
+big task
+
 - [x] download ins videos and images
   - [ ] download multiple files in one task
 - [ ] make it fast and with UI progress bar

lib/aier_bot/bot.ex

@@ -24,11 +24,36 @@ defmodule AierBot.Bot do
     answer(context, "Here is your help:")
   end
 
+  # def handle({:text, text, message}, context) do
   def handle({:text, text, %{chat: chat}}, _context) do
-    url = CobaltClient.get_download_url(text)
-    {file_name, file_content} = FileDownloader.download(url)
+    urls = extract_urls_from_string(text)
 
-    {:ok, _} = bot_send_file(chat.id, file_name, file_content)
+    if Enum.empty?(urls) do
+      # TODO: 思考：使用 DSL answer 还是 function send_message?
+      # answer(context, "No URL found.")
+      ExGram.send_message(chat.id, "No URL found.")
+    else
+      # MEMO: for payment, free only one url, for multiple urls, need to pay
+      url = List.first(urls)
+
+      case CobaltClient.get_download_url(url) do
+        {:ok, download_url} ->
+          {:ok, file_name, file_content} = FileDownloader.download(download_url)
+
+          {:ok, _} = bot_send_file(chat.id, file_name, file_content)
+
+        {:error, error} ->
+          ExGram.send_message(chat.id, "Failed to download file. Reason: #{inspect(error)}")
+      end
+    end
+  end
+
+  defp extract_urls_from_string(str) do
+    regex = ~r/http[s]?:\/\/[^\s]+/
+    matches = Regex.scan(regex, str)
+
+    # 扁平化匹配结果，因为Regex.scan返回的是一个列表的列表
+    Enum.map(matches, fn [url] -> url end)
   end
 
   defp bot_send_file(chat_id, file_name, file_content) do

lib/aier_bot/cobalt_client.ex

@@ -16,7 +16,8 @@ defmodule AierBot.CobaltClient do
     get_download_url("https://www.instagram.com/p/C9pr7NDPAyd/?igsh=azBiNHJ0ZXd3bTFh") #=>
 
   """
-  def get_download_url("https://www.instagram.com/" <> _ = text) do
+  # def get_download_url("https://www.instagram.com/" <> _ = text) do
+  def get_download_url(text) do
     # https://www.instagram.com/p/C9pr7NDPAyd/?igsh=azBiNHJ0ZXd3bTFh => https://www.instagram.com/p/C9pr7NDPAyd/
     url = String.split(text, "?") |> hd()
     # IO.inspect(pure_url)
@@ -25,40 +26,46 @@ defmodule AierBot.CobaltClient do
         #
         case response.body do
           %{"url" => url} ->
-            url
+            {:ok, url}
 
           %{"status" => "picker", "picker" => picker_items} ->
             # [%{"url" => url}] = picker_items
             # error:  you attempted to apply a function named :first on [],  If you are using Kernel.apply/3, make sure the module is an atom. If you are using the dot syntax, such as module.function(), make sure the left-hand side of the dot is an atom representing a module
             # picker_items.first()["url"]
-            Enum.at(picker_items, 0)["url"]
+            # TODO: handle multiple urls
+            {:ok, Enum.at(picker_items, 0)["url"]}
 
           # url
+          %{"status" => "error", "text" => error_msg} ->
+            IO.puts("Error: #{error_msg}")
+
+            {:error, error_msg}
+
           _ ->
             IO.inspect(response.body)
-            nil
+            {:error, "Unknown error"}
         end
 
       {:error, error} ->
-        error
+        {:error, error}
     end
   end
 
   # TODO: get_download_urls for multiple urls
-  def get_download_url(url) do
-    case post("api/json", %{url: url}) do
-      {:ok, response} ->
-        # %{
-        #   "status" => "redirect",
-        #   "url" => "https://video.twimg.com/amplify_video/1814202798097268736/vid/avc1/720x1192/HAD9zyJn1xoP4oRN.mp4?tag=16"
-        # }
-        %{"url" => url} = response.body
-        url
+  # def get_download_url(url) do
+  #   case post("api/json", %{url: url}) do
+  #     {:ok, response} ->
+  #       # %{
+  #       #   "status" => "redirect",
+  #       #   "url" => "https://video.twimg.com/amplify_video/1814202798097268736/vid/avc1/720x1192/HAD9zyJn1xoP4oRN.mp4?tag=16"
+  #       # }
+  #       %{"url" => url} = response.body
+  #       url
 
-      # TODO send photo to telegram
+  #     # TODO send photo to telegram
 
-      {:error, error} ->
-        error
-    end
-  end
+  #     {:error, error} ->
+  #       error
+  #   end
+  # end
 end

lib/aier_bot/file_downloader.ex

@@ -2,32 +2,40 @@ defmodule AierBot.FileDownloader do
   use Tesla
 
   def download(url) do
-    # https://video.twimg.com/amplify_video/1814202798097268736/vid/avc1/720x1192/HAD9zyJn1xoP4oRN.mp4?tag=16
-
-    IO.puts(url)
+    IO.inspect(url, label: "Download URL")
 
+    # TODO: support youtube video download,
     case get(url) do
       {:ok, %Tesla.Env{status: 200, body: body, headers: headers}} ->
-        # TODO: 可以使用异步，并且实时更新 bot 状态
-        IO.puts("Downloading file...")
-
-        # [..., {"content-type", "video/mp4"}, ...] = headers
-        utc_now_str =
-          DateTime.utc_now() |> DateTime.shift_zone!("Etc/UTC") |> DateTime.to_iso8601()
-
-        content_type = headers |> Enum.find(fn {k, _} -> k == "content-type" end) |> elem(1)
-        # IO.puts("Content-Type: #{content_type}")
-        file_path = (utc_now_str <> "_" <> content_type) |> String.replace("/", ".")
+        ext =
+          headers
+          |> Enum.find(fn {k, _} -> k == "content-type" end)
+          |> elem(1)
+          |> String.split("/")
+          |> List.last()
 
-        File.write("./.local/storage/#{file_path}", body)
-        IO.puts("File downloaded successfully.")
-        {file_path, body}
+        file_name = gen_desc_filename() <> "." <> ext
+        File.write("./.local/storage/#{file_name}", body)
+        {:ok, file_name, body}
 
       {:ok, %Tesla.Env{status: status}} ->
         IO.puts("Failed to download file. Status: #{status}")
+        {:error, "Failed to download file"}
 
       {:error, reason} ->
         IO.puts("Failed to download file. Reason: #{inspect(reason)}")
+        {:error, "Failed to download file"}
     end
   end
+
+  @spec gen_desc_filename() :: String.t()
+  defp gen_desc_filename() do
+    # 10^16 - current_time = 9999999999999999 - current_time = 9999999999999999 - 1630848000000 = 9999999998361159
+    max = :math.pow(10, 16) |> round()
+    utc_now = DateTime.utc_now() |> DateTime.to_unix()
+
+    (max - utc_now)
+    |> Integer.to_string()
+    |> String.pad_leading(16, "0")
+  end
 end