fix(media-types): return video/mp4 for .mp4 extension

[kt3k]

closes #5433

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.35%. Comparing base (702f048) to head (eda1eea).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5475   +/-   ##
=======================================
  Coverage   96.34%   96.35%           
=======================================
  Files         463      463           
  Lines       37725    37726    +1     
  Branches     5566     5567    +1     
=======================================
+ Hits        36348    36349    +1     
  Misses       1335     1335           
  Partials       42       42           

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[iuioiua]

This makes me wonder if there are any extensions that are incorrect. E.g. .mpg4 should return video/mp4, but it also returns video/mp4. We should probably come up with some better way to calculate preference in a follow-up PR.

This is a quick and dirty script to help find which extensions have more than one content-type:

import db from "./media_types/vendor/db.ts";

const result: Record<string, string[]> = {};

for (const [key, value] of Object.entries(db)) {
  if (Array.isArray(value.extensions)) {
    for (const ext of value.extensions) {
      if (!result[ext]) {
        result[ext] = [];
      }
      result[ext].push(key);
    }
  }
}

for (const [ext, contentTypes] of Object.entries(result)) {
  if (contentTypes.length > 1) console.log([ext, contentTypes]);
}