| 1 | /** |
| 2 | * Standard MIME type lookup. |
| 3 | * |
| 4 | * @stability unstable |
| 5 | * @since 4.0.0 |
| 6 | */ |
| 7 | import * as Option from "../Option.ts" |
| 8 | import standardTypes from "./internal/mimeTypes.ts" |
| 9 | |
| 10 | interface Tables { |
| 11 | readonly extensionToType: Map<string, string> |
| 12 | readonly typeToExtension: Map<string, string> |
| 13 | readonly typeToExtensions: Map<string, Set<string>> |
| 14 | } |
| 15 | |
| 16 | // Built on first lookup rather than at module evaluation, so bundles that import this |
| 17 | // module without calling a lookup can drop the tables and the MIME data they index. |
| 18 | let tables: Tables | undefined |
| 19 | |
| 20 | const getTables = (): Tables => { |
| 21 | if (tables !== undefined) { |
| 22 | return tables |
| 23 | } |
| 24 | const extensionToType = new Map<string, string>() |
| 25 | const typeToExtension = new Map<string, string>() |
| 26 | const typeToExtensions = new Map<string, Set<string>>() |
| 27 | |
| 28 | for (const [type, extensions] of Object.entries(standardTypes)) { |
| 29 | const allExtensions = new Set<string>() |
| 30 | typeToExtensions.set(type, allExtensions) |
| 31 | for (let index = 0; index < extensions.length; index++) { |
| 32 | let extension: string = extensions[index] |
| 33 | const starred = extension.startsWith("*") |
| 34 | if (starred) { |
| 35 | extension = extension.slice(1) |
| 36 | } |
| 37 | allExtensions.add(extension) |
| 38 | if (index === 0) { |
| 39 | typeToExtension.set(type, extension) |
| 40 | } |
| 41 | if (!starred) { |
| 42 | extensionToType.set(extension, type) |
| 43 | } |
| 44 | } |
| 45 | } |
| 46 | tables = { extensionToType, typeToExtension, typeToExtensions } |
| 47 | return tables |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * Returns the standard MIME type associated with a file name or extension. |
| 52 | * |
| 53 | * @stability unstable |
| 54 | * @category utilities |
| 55 | * @since 4.0.0 |
| 56 | */ |
| 57 | export const getType = (path: string): Option.Option<string> => { |
| 58 | if (typeof path !== "string") { |
| 59 | return Option.none() |
| 60 | } |
| 61 | const last = path.replace(/^.*[/\\]/s, "").toLowerCase() |
| 62 | const extension = last.replace(/^.*\./s, "").toLowerCase() |
| 63 | const hasPath = last.length < path.length |
| 64 | const hasDot = extension.length < last.length - 1 |
| 65 | if (!hasDot && hasPath) { |
| 66 | return Option.none() |
| 67 | } |
| 68 | return Option.fromUndefinedOr(getTables().extensionToType.get(extension)) |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Returns the default file extension associated with a standard MIME type. |
| 73 | * |
| 74 | * @stability unstable |
| 75 | * @category utilities |
| 76 | * @since 4.0.0 |
| 77 | */ |
| 78 | export const getExtension = (type: string): Option.Option<string> => { |
| 79 | if (typeof type !== "string") { |
| 80 | return Option.none() |
| 81 | } |
| 82 | return Option.fromUndefinedOr(getTables().typeToExtension.get(type.split(";")[0].trim().toLowerCase())) |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Returns every file extension associated with a standard MIME type. |
| 87 | * |
| 88 | * @stability unstable |
| 89 | * @category utilities |
| 90 | * @since 4.0.0 |
| 91 | */ |
| 92 | export const getAllExtensions = (type: string): Option.Option<ReadonlySet<string>> => { |
| 93 | if (typeof type !== "string") { |
| 94 | return Option.none() |
| 95 | } |
| 96 | return Option.fromUndefinedOr(getTables().typeToExtensions.get(type.split(";")[0].trim().toLowerCase())) |
| 97 | } |