refactor: move OC.MimeType to src and add vitest unit tests

core/js/merged-template-prepend.json

@@ -1,5 +1,4 @@
 [
-  "mimetype.js",
   "mimetypelist.js",
   "select2-toggleselect.js"
 ]

core/src/OC/index.js

@@ -63,6 +63,7 @@ import {
 	showMenu,
 	unregisterMenu,
 } from './menu.js'
+import * as MimeType from './mimeType.js'
 import msg from './msg.js'
 import { redirect, reload } from './navigation.js'
 import Notification from './notification.js'
@@ -127,6 +128,7 @@ export default {
 	currentUser,
 	dialogs: Dialogs,
 	EventSource,
+	MimeType,
 	/**
 	 * Returns the currently logged in user or null if there is no logged in
 	 * user (public page mode)

core/src/OC/mimeType.js

@@ -0,0 +1,94 @@
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+import { generateUrl } from '@nextcloud/router'
+
+const iconCache = new Map()
+
+/**
+ * Return the url to icon of the given mimeType
+ *
+ * @param {string} mimeType The mimeType to get the icon for
+ * @return {string} Url to the icon for mimeType
+ */
+export function getIconUrl(mimeType) {
+	if (typeof mimeType === 'undefined') {
+		return undefined
+	}
+
+	while (mimeType in window.OC.MimeTypeList.aliases) {
+		mimeType = window.OC.MimeTypeList.aliases[mimeType]
+	}
+
+	if (!iconCache.has(mimeType)) {
+		// First try to get the correct icon from the current theme
+		let gotIcon = null
+		let path = ''
+		if (OC.theme.folder !== '' && Array.isArray(OC.MimeTypeList.themes[OC.theme.folder])) {
+			path = generateUrl('/themes/' + window.OC.theme.folder + '/core/img/filetypes/')
+			const icon = getMimeTypeIcon(mimeType, window.OC.MimeTypeList.themes[OC.theme.folder])
+
+			if (icon !== null) {
+				gotIcon = true
+				path += icon
+			}
+		}
+		if (window.OCA.Theming && gotIcon === null) {
+			path = generateUrl('/apps/theming/img/core/filetypes/')
+			path += getMimeTypeIcon(mimeType, window.OC.MimeTypeList.files)
+			gotIcon = true
+		}
+
+		// If we do not yet have an icon fall back to the default
+		if (gotIcon === null) {
+			path = generateUrl('/core/img/filetypes/')
+			path += getMimeTypeIcon(mimeType, window.OC.MimeTypeList.files)
+		}
+
+		path += '.svg'
+
+		if (window.OCA.Theming) {
+			path += '?v=' + window.OCA.Theming.cacheBuster
+		}
+
+		// Cache the result
+		iconCache.set(mimeType, path)
+	}
+
+	return iconCache.get(mimeType)
+}
+
+/**
+ * Return the file icon we want to use for the given mimeType.
+ * The file needs to be present in the supplied file list
+ *
+ * @param {string} mimeType The mimeType we want an icon for
+ * @param {string[]} files The available icons in this theme
+ * @return {string | null} The icon to use or null if there is no match
+ */
+function getMimeTypeIcon(mimeType, files) {
+	const icon = mimeType.replace(new RegExp('/', 'g'), '-')
+
+	// Generate path
+	if (mimeType === 'dir' && files.includes('folder')) {
+		return 'folder'
+	} else if (mimeType === 'dir-encrypted' && files.includes('folder-encrypted')) {
+		return 'folder-encrypted'
+	} else if (mimeType === 'dir-shared' && files.includes('folder-shared')) {
+		return 'folder-shared'
+	} else if (mimeType === 'dir-public' && files.includes('folder-public')) {
+		return 'folder-public'
+	} else if ((mimeType === 'dir-external' || mimeType === 'dir-external-root') && files.includes('folder-external')) {
+		return 'folder-external'
+	} else if (files.includes(icon)) {
+		return icon
+	} else if (files.includes(icon.split('-')[0])) {
+		return icon.split('-')[0]
+	} else if (files.includes('file')) {
+		return 'file'
+	}
+
+	return null
+}