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feat: add media_types (denoland#2286)
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# std/media_types | ||
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Provides an API for handling media (MIME) types. | ||
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These APIs are inspired by the GoLang [`mime`](https://pkg.go.dev/mime) package | ||
and [jshttp/mime-types](https://github.com/jshttp/mime-types), and is designed | ||
to integrate and improve the APIs from | ||
[deno.land/x/media_types](https://deno.land/x/media_types). | ||
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The `vendor` folder contains copy of the | ||
[jshttp/mime-db](https://github.com/jshttp/mime-types) `db.json` file along with | ||
its license. | ||
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## `contentType()` | ||
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Given a extension or media type, return a fully qualified header value for | ||
setting a `Content-Type` or `Content-Disposition` header. The function will | ||
process the value passed as a media type if it contains a `/`, otherwise will | ||
attempt to match as an extension, with or without the leading `.`. | ||
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> Note: a side effect of `deno/x/media_types` was that you could pass a file | ||
> name (e.g. `file.json`) and it would return the content type. This behavior is | ||
> intentionally not supported here. If you want to get an extension for a file | ||
> name, use `extname()` from `std/path/mod.ts` to determine the extension and | ||
> pass it here. | ||
```ts | ||
import { contentType } from "https://deno.land/std@$STD_VERSION/media_types/mod.ts"; | ||
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contentType(".json"); // `application/json; charset=UTF-8` | ||
contentType("text/html"); // `text/html; charset=UTF-8` | ||
contentType("txt"); // `text/plain; charset=UTF-8` | ||
contentType("foo"); // undefined | ||
contentType("file.json"); // undefined | ||
``` | ||
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## `extension()` | ||
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Given a media type, return the most relevant extension. If no extension can be | ||
determined `undefined` is returned. | ||
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```ts | ||
import { extension } from "https://deno.land/std@$STD_VERSION/media_types/mod.ts"; | ||
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extension("text/plain"); // `txt` | ||
extension("application/json"); // `json` | ||
extension("text/html; charset=UTF-8"); // `html` | ||
extension("application/foo"); // undefined | ||
``` | ||
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## `extensionsByType()` | ||
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Given a media type, return an array of extensions that can be applied. If no | ||
extension can be determined `undefined` is returned. | ||
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```ts | ||
import { extensionsByType } from "https://deno.land/std@$STD_VERSION/media_types/mod.ts"; | ||
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extensionsByType("application/json"); // ["js", "mjs"] | ||
extensionsByType("text/html; charset=UTF-8"); // ["html", "htm", "shtml"] | ||
extensionsByType("application/foo"); // undefined | ||
``` | ||
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## `formatMediaType()` | ||
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Given a media type and optional parameters, return a spec compliant value. If | ||
the parameters result in a non-compliant value, an empty string (`""`) is | ||
returned. | ||
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```ts | ||
import { formatMediaType } from "https://deno.land/std@$STD_VERSION/media_types/mod.ts"; | ||
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formatMediaType("text/plain", { charset: "UTF-8" }); // `text/plain; charset=UTF-8` | ||
``` | ||
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## `getCharset()` | ||
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Given a media type, return the charset encoding for the value. | ||
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```ts | ||
import { getCharset } from "https://deno.land/std@$STD_VERSION/media_types/mod.ts"; | ||
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getCharset("text/plain"); // `UTF-8` | ||
getCharset("application/foo"); // undefined | ||
getCharset("application/news-checkgroups"); // `US-ASCII` | ||
getCharset("application/news-checkgroups; charset=UTF-8"); // `UTF-8` | ||
``` | ||
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## `parseMediaType()` | ||
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Given a header value string, parse a value into a media type and any optional | ||
parameters. If the supplied value is invalid, the function will throw. | ||
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```ts | ||
import { parseMediaType } from "https://deno.land/std@$STD_VERSION/media_types/mod.ts"; | ||
import { assertEquals } from "https://deno.land/std@$STD_VERSION/testing/asserts.ts"; | ||
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assertEquals( | ||
parseMediaType("application/JSON"), | ||
[ | ||
"application/json", | ||
undefined, | ||
], | ||
); | ||
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assertEquals( | ||
parseMediaType("text/html; charset=UTF-8"), | ||
[ | ||
"application/json", | ||
{ charset: "UTF-8" }, | ||
], | ||
); | ||
``` | ||
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## `typeByExtension()` | ||
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Given an extension, return a media type. The extension can have a leading `.` or | ||
not. | ||
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```ts | ||
import { typeByExtension } from "https://deno.land/std@$STD_VERSION/media_types/mod.ts"; | ||
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typeByExtension("js"); // `application/json` | ||
typeByExtension(".HTML"); // `text/html` | ||
typeByExtension("foo"); // undefined | ||
typeByExtension("file.json"); // undefined | ||
``` |
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license. | ||
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/** Supporting functions for media_types that do not make part of the public | ||
* API. | ||
* | ||
* @module | ||
* @private | ||
*/ | ||
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export function consumeToken(v: string): [token: string, rest: string] { | ||
const notPos = indexOf(v, isNotTokenChar); | ||
if (notPos == -1) { | ||
return [v, ""]; | ||
} | ||
if (notPos == 0) { | ||
return ["", v]; | ||
} | ||
return [v.slice(0, notPos), v.slice(notPos)]; | ||
} | ||
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export function consumeValue(v: string): [value: string, rest: string] { | ||
if (!v) { | ||
return ["", v]; | ||
} | ||
if (v[0] !== `"`) { | ||
return consumeToken(v); | ||
} | ||
let value = ""; | ||
for (let i = 1; i < v.length; i++) { | ||
const r = v[i]; | ||
if (r === `"`) { | ||
return [value, v.slice(i + 1)]; | ||
} | ||
if (r === "\\" && i + 1 < v.length && isTSpecial(v[i + 1])) { | ||
value += v[i + 1]; | ||
i++; | ||
continue; | ||
} | ||
if (r === "\r" || r === "\n") { | ||
return ["", v]; | ||
} | ||
value += v[i]; | ||
} | ||
return ["", v]; | ||
} | ||
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export function consumeMediaParam( | ||
v: string, | ||
): [key: string, value: string, rest: string] { | ||
let rest = v.trimStart(); | ||
if (!rest.startsWith(";")) { | ||
return ["", "", v]; | ||
} | ||
rest = rest.slice(1); | ||
rest = rest.trimStart(); | ||
let param: string; | ||
[param, rest] = consumeToken(rest); | ||
param = param.toLowerCase(); | ||
if (!param) { | ||
return ["", "", v]; | ||
} | ||
rest = rest.slice(1); | ||
rest = rest.trimStart(); | ||
const [value, rest2] = consumeValue(rest); | ||
if (value == "" && rest2 === rest) { | ||
return ["", "", v]; | ||
} | ||
rest = rest2; | ||
return [param, value, rest]; | ||
} | ||
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export function decode2331Encoding(v: string): string | undefined { | ||
const sv = v.split(`'`, 3); | ||
if (sv.length !== 3) { | ||
return undefined; | ||
} | ||
const charset = sv[0].toLowerCase(); | ||
if (!charset) { | ||
return undefined; | ||
} | ||
if (charset != "us-ascii" && charset != "utf-8") { | ||
return undefined; | ||
} | ||
const encv = decodeURI(sv[2]); | ||
if (!encv) { | ||
return undefined; | ||
} | ||
return encv; | ||
} | ||
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function indexOf<T>(s: Iterable<T>, fn: (s: T) => boolean): number { | ||
let i = -1; | ||
for (const v of s) { | ||
i++; | ||
if (fn(v)) { | ||
return i; | ||
} | ||
} | ||
return -1; | ||
} | ||
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export function isIterator<T>(obj: unknown): obj is Iterable<T> { | ||
if (obj == null) { | ||
return false; | ||
} | ||
// deno-lint-ignore no-explicit-any | ||
return typeof (obj as any)[Symbol.iterator] === "function"; | ||
} | ||
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export function isToken(s: string): boolean { | ||
if (!s) { | ||
return false; | ||
} | ||
return indexOf(s, isNotTokenChar) < 0; | ||
} | ||
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function isNotTokenChar(r: string): boolean { | ||
return !isTokenChar(r); | ||
} | ||
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function isTokenChar(r: string): boolean { | ||
const code = r.charCodeAt(0); | ||
return code > 0x20 && code < 0x7f && !isTSpecial(r); | ||
} | ||
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function isTSpecial(r: string): boolean { | ||
return `()<>@,;:\\"/[]?=`.includes(r[0]); | ||
} | ||
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const CHAR_CODE_SPACE = " ".charCodeAt(0); | ||
const CHAR_CODE_TILDE = "~".charCodeAt(0); | ||
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export function needsEncoding(s: string): boolean { | ||
for (const b of s) { | ||
const charCode = b.charCodeAt(0); | ||
if ( | ||
(charCode < CHAR_CODE_SPACE || charCode > CHAR_CODE_TILDE) && b !== "\t" | ||
) { | ||
return true; | ||
} | ||
} | ||
return false; | ||
} |
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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license. | ||
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import { assertEquals } from "../testing/asserts.ts"; | ||
import { consumeMediaParam, consumeToken, consumeValue } from "./_util.ts"; | ||
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Deno.test({ | ||
name: "media_types::util - consumeToken()", | ||
fn() { | ||
const fixtures = [ | ||
["foo bar", "foo", " bar"], | ||
["bar", "bar", ""], | ||
["", "", ""], | ||
[" foo", "", " foo"], | ||
] as const; | ||
for (const [fixture, token, rest] of fixtures) { | ||
assertEquals(consumeToken(fixture), [token, rest]); | ||
} | ||
}, | ||
}); | ||
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Deno.test({ | ||
name: "media_types::util - consumeValue()", | ||
fn() { | ||
const fixtures = [ | ||
["foo bar", "foo", " bar"], | ||
["bar", "bar", ""], | ||
[" bar ", "", " bar "], | ||
[`"My value"end`, "My value", "end"], | ||
[`"My value" end`, "My value", " end"], | ||
[`"\\\\" rest`, "\\", " rest"], | ||
[`"My \\" value"end`, 'My " value', "end"], | ||
[`"\\" rest`, "", `"\\" rest`], | ||
[`"C:\\dev\\go\\robots.txt"`, `C:\\dev\\go\\robots.txt`, ""], | ||
[`"C:\\新建文件夹\\中文第二次测试.mp4"`, `C:\\新建文件夹\\中文第二次测试.mp4`, ""], | ||
] as const; | ||
for (const [fixture, value, rest] of fixtures) { | ||
assertEquals(consumeValue(fixture), [value, rest]); | ||
} | ||
}, | ||
}); | ||
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Deno.test({ | ||
name: "media_types::util - consumeMediaParam()", | ||
fn() { | ||
const fixtures = [ | ||
[" ; foo=bar", "foo", "bar", ""], | ||
["; foo=bar", "foo", "bar", ""], | ||
[";foo=bar", "foo", "bar", ""], | ||
[";FOO=bar", "foo", "bar", ""], | ||
[`;foo="bar"`, "foo", "bar", ""], | ||
[`;foo="bar"; `, "foo", "bar", "; "], | ||
[`;foo="bar"; foo=baz`, "foo", "bar", "; foo=baz"], | ||
[` ; boundary=----CUT;`, "boundary", "----CUT", ";"], | ||
[ | ||
` ; key=value; blah="value";name="foo" `, | ||
"key", | ||
"value", | ||
`; blah="value";name="foo" `, | ||
], | ||
[`; blah="value";name="foo" `, "blah", "value", `;name="foo" `], | ||
[`;name="foo" `, "name", "foo", ` `], | ||
] as const; | ||
for (const [fixture, key, value, rest] of fixtures) { | ||
assertEquals(consumeMediaParam(fixture), [key, value, rest]); | ||
} | ||
}, | ||
}); |
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