1 files changed, 306 insertions, 0 deletions
diff --git a/ext/js/comm/anki-connect.js b/ext/js/comm/anki-connect.js
new file mode 100644
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+++ b/ext/js/comm/anki-connect.js
@@ -0,0 +1,306 @@
+/*
+ * Copyright (C) 2016-2022  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/>.
+ */
+
+/* global
+ * AnkiUtil
+ */
+
+class AnkiConnect {
+    constructor() {
+        this._enabled = false;
+        this._server = null;
+        this._localVersion = 2;
+        this._remoteVersion = 0;
+        this._versionCheckPromise = null;
+    }
+
+    get server() {
+        return this._server;
+    }
+
+    set server(value) {
+        this._server = value;
+    }
+
+    get enabled() {
+        return this._enabled;
+    }
+
+    set enabled(value) {
+        this._enabled = value;
+    }
+
+    async isConnected() {
+        try {
+            await this._invoke('version');
+            return true;
+        } catch (e) {
+            return false;
+        }
+    }
+
+    async getVersion() {
+        if (!this._enabled) { return null; }
+        await this._checkVersion();
+        return await this._invoke('version', {});
+    }
+
+    async addNote(note) {
+        if (!this._enabled) { return null; }
+        await this._checkVersion();
+        return await this._invoke('addNote', {note});
+    }
+
+    async canAddNotes(notes) {
+        if (!this._enabled) { return []; }
+        await this._checkVersion();
+        return await this._invoke('canAddNotes', {notes});
+    }
+
+    async notesInfo(notes) {
+        if (!this._enabled) { return []; }
+        await this._checkVersion();
+        return await this._invoke('notesInfo', {notes});
+    }
+
+    async getDeckNames() {
+        if (!this._enabled) { return []; }
+        await this._checkVersion();
+        return await this._invoke('deckNames');
+    }
+
+    async getModelNames() {
+        if (!this._enabled) { return []; }
+        await this._checkVersion();
+        return await this._invoke('modelNames');
+    }
+
+    async getModelFieldNames(modelName) {
+        if (!this._enabled) { return []; }
+        await this._checkVersion();
+        return await this._invoke('modelFieldNames', {modelName});
+    }
+
+    async guiBrowse(query) {
+        if (!this._enabled) { return []; }
+        await this._checkVersion();
+        return await this._invoke('guiBrowse', {query});
+    }
+
+    async guiBrowseNote(noteId) {
+        return await this.guiBrowse(`nid:${noteId}`);
+    }
+
+    /**
+     * Opens the note editor GUI.
+     * @param {number} noteId The ID of the note.
+     * @returns {Promise<null>} Nothing is returned.
+     */
+    async guiEditNote(noteId) {
+        return await this._invoke('guiEditNote', {note: noteId});
+    }
+
+    /**
+     * Stores a file with the specified base64-encoded content inside Anki's media folder.
+     * @param {string} fileName The name of the file.
+     * @param {string} content The base64-encoded content of the file.
+     * @returns {?string} The actual file name used to store the file, which may be different; or `null` if the file was not stored.
+     * @throws {Error} An error is thrown is this object is not enabled.
+     */
+    async storeMediaFile(fileName, content) {
+        if (!this._enabled) {
+            throw new Error('AnkiConnect not enabled');
+        }
+        await this._checkVersion();
+        return await this._invoke('storeMediaFile', {filename: fileName, data: content});
+    }
+
+    /**
+     * Finds notes matching a query.
+     * @param {string} query Searches for notes matching a query.
+     * @returns {number[]} An array of note IDs.
+     * @see https://docs.ankiweb.net/searching.html
+     */
+    async findNotes(query) {
+        if (!this._enabled) { return []; }
+        await this._checkVersion();
+        return await this._invoke('findNotes', {query});
+    }
+
+    async findNoteIds(notes) {
+        if (!this._enabled) { return []; }
+        await this._checkVersion();
+        const actions = notes.map((note) => {
+            let query = '';
+            switch (this._getDuplicateScopeFromNote(note)) {
+                case 'deck':
+                    query = `"deck:${this._escapeQuery(note.deckName)}" `;
+                    break;
+                case 'deck-root':
+                    query = `"deck:${this._escapeQuery(AnkiUtil.getRootDeckName(note.deckName))}" `;
+                    break;
+            }
+            query += this._fieldsToQuery(note.fields);
+            return {action: 'findNotes', params: {query}};
+        });
+        return await this._invoke('multi', {actions});
+    }
+
+    async suspendCards(cardIds) {
+        if (!this._enabled) { return false; }
+        await this._checkVersion();
+        return await this._invoke('suspend', {cards: cardIds});
+    }
+
+    async findCards(query) {
+        if (!this._enabled) { return []; }
+        await this._checkVersion();
+        return await this._invoke('findCards', {query});
+    }
+
+    async findCardsForNote(noteId) {
+        return await this.findCards(`nid:${noteId}`);
+    }
+
+    /**
+     * Gets information about the AnkiConnect APIs available.
+     * @param {string[]} scopes A list of scopes to get information about.
+     * @param {?string[]} actions A list of actions to check for
+     * @returns {object} Information about the APIs.
+     */
+    async apiReflect(scopes, actions=null) {
+        return await this._invoke('apiReflect', {scopes, actions});
+    }
+
+    /**
+     * Checks whether a specific API action exists.
+     * @param {string} action The action to check for.
+     * @returns {boolean} Whether or not the action exists.
+     */
+    async apiExists(action) {
+        const {actions} = await this.apiReflect(['actions'], [action]);
+        return actions.includes(action);
+    }
+
+    /**
+     * Checks if a specific error object corresponds to an unsupported action.
+     * @param {Error} error An error object generated by an API call.
+     * @returns {boolean} Whether or not the error indicates the action is not supported.
+     */
+    isErrorUnsupportedAction(error) {
+        if (error instanceof Error) {
+            const {data} = error;
+            if (isObject(data) && data.apiError === 'unsupported action') {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    // Private
+
+    async _checkVersion() {
+        if (this._remoteVersion < this._localVersion) {
+            if (this._versionCheckPromise === null) {
+                const promise = this._invoke('version');
+                promise
+                    .catch(() => {})
+                    .finally(() => { this._versionCheckPromise = null; });
+                this._versionCheckPromise = promise;
+            }
+            this._remoteVersion = await this._versionCheckPromise;
+            if (this._remoteVersion < this._localVersion) {
+                throw new Error('Extension and plugin versions incompatible');
+            }
+        }
+    }
+
+    async _invoke(action, params) {
+        let response;
+        try {
+            response = await fetch(this._server, {
+                method: 'POST',
+                mode: 'cors',
+                cache: 'default',
+                credentials: 'omit',
+                headers: {
+                    'Content-Type': 'application/json'
+                },
+                redirect: 'follow',
+                referrerPolicy: 'no-referrer',
+                body: JSON.stringify({action, params, version: this._localVersion})
+            });
+        } catch (e) {
+            const error = new Error('Anki connection failure');
+            error.data = {action, params, originalError: e};
+            throw error;
+        }
+
+        if (!response.ok) {
+            const error = new Error(`Anki connection error: ${response.status}`);
+            error.data = {action, params, status: response.status};
+            throw error;
+        }
+
+        let responseText = null;
+        let result;
+        try {
+            responseText = await response.text();
+            result = JSON.parse(responseText);
+        } catch (e) {
+            const error = new Error('Invalid Anki response');
+            error.data = {action, params, status: response.status, responseText, originalError: e};
+            throw error;
+        }
+
+        if (isObject(result)) {
+            const apiError = result.error;
+            if (typeof apiError !== 'undefined') {
+                const error = new Error(`Anki error: ${apiError}`);
+                error.data = {action, params, status: response.status, apiError};
+                throw error;
+            }
+        }
+
+        return result;
+    }
+
+    _escapeQuery(text) {
+        return text.replace(/"/g, '');
+    }
+
+    _fieldsToQuery(fields) {
+        const fieldNames = Object.keys(fields);
+        if (fieldNames.length === 0) {
+            return '';
+        }
+
+        const key = fieldNames[0];
+        return `"${key.toLowerCase()}:${this._escapeQuery(fields[key])}"`;
+    }
+
+    _getDuplicateScopeFromNote(note) {
+        const {options} = note;
+        if (typeof options === 'object' && options !== null) {
+            const {duplicateScope} = options;
+            if (typeof duplicateScope !== 'undefined') {
+                return duplicateScope;
+            }
+        }
+        return null;
+    }
+}