[Feature Request] Server may take time to process media

[SpriteOvO]

After I attached a GIF media and tried to post a new status with it, I got an error:

Api { status: 422, response: ApiError { error: "Cannot attach files that have not finished processing. Try again in a moment!", error_description: None } }

According to the API /media docs.

202: Accepted

MediaAttachment was created successfully, but the full-size file is still processing. Note that the MediaAttachment’s url will still be null, as the media is still being processed in the background. However, the preview_url should be available. Use GET /api/v1/media/:id to check the status of the media attachment.

Checking if an attachment has finished processing is impossible for now. I suggest:

• Make Mastodon::media method returns an enum to indicate if it is still being processing.

• Add a new method Mastodon::check_media_status to check if a media is finished processing.

• Add a new method Mastodon::upload_media (maybe another better name) to wrap the wait process, it receives a timeout value from users.