1 files changed, 126 insertions, 0 deletions
diff --git a/ext/js/data/permissions-util.js b/ext/js/data/permissions-util.js
new file mode 100644
index 00000000..bd3a18ce
--- /dev/null
+++ b/ext/js/data/permissions-util.js
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2021  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+class PermissionsUtil {
+    constructor() {
+        this._ankiFieldMarkersRequiringClipboardPermission = new Set([
+            'clipboard-image',
+            'clipboard-text'
+        ]);
+        this._ankiMarkerPattern = /\{([\w-]+)\}/g;
+    }
+
+    hasPermissions(permissions) {
+        return new Promise((resolve, reject) => chrome.permissions.contains(permissions, (result) => {
+            const e = chrome.runtime.lastError;
+            if (e) {
+                reject(new Error(e.message));
+            } else {
+                resolve(result);
+            }
+        }));
+    }
+
+    setPermissionsGranted(permissions, shouldHave) {
+        return (
+            shouldHave ?
+            new Promise((resolve, reject) => chrome.permissions.request(permissions, (result) => {
+                const e = chrome.runtime.lastError;
+                if (e) {
+                    reject(new Error(e.message));
+                } else {
+                    resolve(result);
+                }
+            })) :
+            new Promise((resolve, reject) => chrome.permissions.remove(permissions, (result) => {
+                const e = chrome.runtime.lastError;
+                if (e) {
+                    reject(new Error(e.message));
+                } else {
+                    resolve(!result);
+                }
+            }))
+        );
+    }
+
+    getAllPermissions() {
+        return new Promise((resolve, reject) => chrome.permissions.getAll((result) => {
+            const e = chrome.runtime.lastError;
+            if (e) {
+                reject(new Error(e.message));
+            } else {
+                resolve(result);
+            }
+        }));
+    }
+
+    getRequiredPermissionsForAnkiFieldValue(fieldValue) {
+        const markers = this._getAnkiFieldMarkers(fieldValue);
+        const markerPermissions = this._ankiFieldMarkersRequiringClipboardPermission;
+        for (const marker of markers) {
+            if (markerPermissions.has(marker)) {
+                return ['clipboardRead'];
+            }
+        }
+        return [];
+    }
+
+    hasRequiredPermissionsForOptions(permissions, options) {
+        const permissionsSet = new Set(permissions.permissions);
+
+        if (!permissionsSet.has('nativeMessaging')) {
+            if (options.parsing.enableMecabParser) {
+                return false;
+            }
+        }
+
+        if (!permissionsSet.has('clipboardRead')) {
+            if (options.clipboard.enableBackgroundMonitor || options.clipboard.enableSearchPageMonitor) {
+                return false;
+            }
+            const fieldMarkersRequiringClipboardPermission = this._ankiFieldMarkersRequiringClipboardPermission;
+            const fieldsList = [
+                options.anki.terms.fields,
+                options.anki.kanji.fields
+            ];
+            for (const fields of fieldsList) {
+                for (const fieldValue of Object.values(fields)) {
+                    const markers = this._getAnkiFieldMarkers(fieldValue);
+                    for (const marker of markers) {
+                        if (fieldMarkersRequiringClipboardPermission.has(marker)) {
+                            return false;
+                        }
+                    }
+                }
+            }
+        }
+
+        return true;
+    }
+
+    // Private
+
+    _getAnkiFieldMarkers(fieldValue) {
+        const pattern = this._ankiMarkerPattern;
+        const markers = [];
+        let match;
+        while ((match = pattern.exec(fieldValue)) !== null) {
+            markers.push(match[1]);
+        }
+        return markers;
+    }
+}