Encoding

As you know, we use a SQLite database to power the majority of the web app. SQLite is a traditional relational database that works out of a single flat file, meaning it doesn't need a separate server process to run.

Let's talk about the elephant in the room: Our current solution for video thumbnails (storing the media in-memory) is a terrible solution. If the server is restarted, all the thumbnails are lost!

But we can't store an image in a SQLite column?... Right?

hold my beer

To do so, we can actually encode the image as a base64 string and shove the whole thing into a text column in SQLite. Base64 is just a way to encode binary (raw) data as text. It's not the most efficient way to do it, but it will work for now.

Assignment

Update the code to store the image data in the thumbnail_url column in the database.

Use base64.StdEncoding.EncodeToString from the encoding/base64 package to convert the image data to a base64 string.
Create a data URL with the media type and base64 encoded image data. The format is:

data:<media-type>;base64,<data>

Store the URL in the thumbnail_url column in the database.
Because the thumbnail_url has all the data we need, delete the global thumbnail map and the GET route for thumbnails.
Restart the server and re-upload the boots-image-horizontal.png thumbnail image to ensure it's working.

Run and submit the CLI tests.