Add media_types collection (denoland/deno_std#97)

Original: https://github.com/denoland/deno_std/commit/0e00fe9cd361165d28beb117cdf103ff8f9d3d8b

1 files changed, 93 insertions, 0 deletions

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+# media_types
+
+A module that assists in resolving media types and extensions. It consumes the
+[mime-db](https://github.com/jshttp/mime-db) and provides API access to the
+information.
+
+## Usage
+
+### `lookup(path)`
+
+Lookup the content type associated with a file. The path can be just the
+extension or the full path name. If the content type cannot be determined the
+function returns `undefined`:
+
+```ts
+import { lookup } from "https://deno.land/x/std/media_types/mod.ts";
+
+lookup("json"); // "application/json"
+lookup(".md"); // "text/markdown"
+lookup("folder/file.js"); // "application/javascript"
+lookup("folder/.htaccess"); // undefined
+```
+
+### `contentType(type)`
+
+Return a full `Content-Type` header value for a given content type or
+extension. When an extension is used, `lookup()` is used to resolve the
+content type first. A default charset is added if not present. The
+function will return `undefined` if the content type cannot be resolved:
+
+```ts
+import { contentType } from "https://deno.land/x/std/media_types/mod.ts";
+import * as path from "https://deno.land/x/std/path/mod.ts";
+
+contentType("markdown"); // "text/markdown; charset=utf-8"
+contentType("file.json"); // "application/json; charset=utf-8"
+contentType("text/html"); // "text/html; charset=utf-8"
+contentType("text/html; charset=iso-8859-1"); // "text/html; charset=iso-8859-1"
+
+contentType(path.extname("/path/to/file.json")); // "application/json; charset=utf-8"
+```
+
+### `extension(type)`
+
+Return a default extension for a given content type. If there is not an
+appropriate extension, `undefined` is returned:
+
+```ts
+import { extension } from "https://deno.land/x/std/media_types/mod.ts";
+
+extension("application/octet-stream"); // "bin"
+```
+
+### `charset(type)`
+
+Lookup the implied default charset for a given content type. If the content
+type cannot be resolved, `undefined` is returned:
+
+```ts
+import { charset } from "https://deno.land/x/std/media_types/mod.ts";
+
+charset("text/markdown"); // "UTF-8"
+```
+
+### `extensions`
+
+A `Map` of extensions by content type, in priority order:
+
+```ts
+import { extensions } from "https://deno.land/x/std/media_types/mod.ts";
+
+extensions.get("application/javascript"); // [ "js", "mjs" ]
+```
+
+### `types`
+
+A `Map` of content types by extension:
+
+```ts
+import { types } from "https://deno.land/x/std/media_types/mod.ts";
+
+types.get("ts"); // "application/javascript"
+```
+
+---
+
+Adapted from [mime-type](https://github.com/jshttp/mime-types).
+
+MIT License.
+
+```
+
+```