Merge pull request #446 from toasted-nutbread/dictionary-images

Dictionary images

4 files changed, 236 insertions, 2 deletions

diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index e0814c17..8a19203f 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -111,7 +111,8 @@ class Backend {
             ['getAnkiModelFieldNames', {handler: this._onApiGetAnkiModelFieldNames.bind(this), async: true}],
             ['getDictionaryInfo', {handler: this._onApiGetDictionaryInfo.bind(this), async: true}],
             ['getDictionaryCounts', {handler: this._onApiGetDictionaryCounts.bind(this), async: true}],
-            ['purgeDatabase', {handler: this._onApiPurgeDatabase.bind(this), async: true}]
+            ['purgeDatabase', {handler: this._onApiPurgeDatabase.bind(this), async: true}],
+            ['getMedia', {handler: this._onApiGetMedia.bind(this), async: true}]
         ]);
 
         this._commandHandlers = new Map([
@@ -762,6 +763,10 @@ class Backend {
         return await this.translator.purgeDatabase();
     }
 
+    async _onApiGetMedia({targets}) {
+        return await this.database.getMedia(targets);
+    }
+
     // Command handlers
 
     async _onCommandSearch(params) {
diff --git a/ext/bg/js/database.js b/ext/bg/js/database.js
index 260c815a..16612403 100644
--- a/ext/bg/js/database.js
+++ b/ext/bg/js/database.js
@@ -33,7 +33,7 @@ class Database {
         }
 
         try {
-            this.db = await Database._open('dict', 5, (db, transaction, oldVersion) => {
+            this.db = await Database._open('dict', 6, (db, transaction, oldVersion) => {
                 Database._upgrade(db, transaction, oldVersion, [
                     {
                         version: 2,
@@ -90,6 +90,15 @@ class Database {
                                 indices: ['dictionary', 'expression', 'reading', 'sequence', 'expressionReverse', 'readingReverse']
                             }
                         }
+                    },
+                    {
+                        version: 6,
+                        stores: {
+                            media: {
+                                primaryKey: {keyPath: 'id', autoIncrement: true},
+                                indices: ['dictionary', 'path']
+                            }
+                        }
                     }
                 ]);
             });
@@ -268,6 +277,34 @@ class Database {
         return result;
     }
 
+    async getMedia(targets) {
+        this._validate();
+
+        const count = targets.length;
+        const promises = [];
+        const results = new Array(count).fill(null);
+        const createResult = Database._createMedia;
+        const processRow = (row, [index, dictionaryName]) => {
+            if (row.dictionary === dictionaryName) {
+                results[index] = createResult(row, index);
+            }
+        };
+
+        const transaction = this.db.transaction(['media'], 'readonly');
+        const objectStore = transaction.objectStore('media');
+        const index = objectStore.index('path');
+
+        for (let i = 0; i < count; ++i) {
+            const {path, dictionaryName} = targets[i];
+            const only = IDBKeyRange.only(path);
+            promises.push(Database._getAll(index, only, [i, dictionaryName], processRow));
+        }
+
+        await Promise.all(promises);
+
+        return results;
+    }
+
     async getDictionaryInfo() {
         this._validate();
 
@@ -432,6 +469,10 @@ class Database {
         return {character, mode, data, dictionary, index};
     }
 
+    static _createMedia(row, index) {
+        return Object.assign({}, row, {index});
+    }
+
     static _getAll(dbIndex, query, context, processRow) {
         const fn = typeof dbIndex.getAll === 'function' ? Database._getAllFast : Database._getAllUsingCursor;
         return fn(dbIndex, query, context, processRow);
diff --git a/ext/bg/js/dictionary-importer.js b/ext/bg/js/dictionary-importer.js
index bf6809ec..3727f7ee 100644
--- a/ext/bg/js/dictionary-importer.js
+++ b/ext/bg/js/dictionary-importer.js
@@ -18,6 +18,7 @@
 /* global
  * JSZip
  * JsonSchema
+ * mediaUtility
  * requestJson
  */
 
@@ -148,6 +149,22 @@ class DictionaryImporter {
             }
         }
 
+        // Extended data support
+        const extendedDataContext = {
+            archive,
+            media: new Map()
+        };
+        for (const entry of termList) {
+            const glossaryList = entry.glossary;
+            for (let i = 0, ii = glossaryList.length; i < ii; ++i) {
+                const glossary = glossaryList[i];
+                if (typeof glossary !== 'object' || glossary === null) { continue; }
+                glossaryList[i] = await this._formatDictionaryTermGlossaryObject(glossary, extendedDataContext, entry);
+            }
+        }
+
+        const media = [...extendedDataContext.media.values()];
+
         // Add dictionary
         const summary = this._createSummary(dictionaryTitle, version, index, {prefixWildcardsSupported});
 
@@ -188,6 +205,7 @@ class DictionaryImporter {
         await bulkAdd('kanji', kanjiList);
         await bulkAdd('kanjiMeta', kanjiMetaList);
         await bulkAdd('tagMeta', tagList);
+        await bulkAdd('media', media);
 
         return {result: summary, errors};
     }
@@ -275,4 +293,76 @@ class DictionaryImporter {
 
         return [termBank, termMetaBank, kanjiBank, kanjiMetaBank, tagBank];
     }
+
+    async _formatDictionaryTermGlossaryObject(data, context, entry) {
+        switch (data.type) {
+            case 'text':
+                return data.text;
+            case 'image':
+                return await this._formatDictionaryTermGlossaryImage(data, context, entry);
+            default:
+                throw new Error(`Unhandled data type: ${data.type}`);
+        }
+    }
+
+    async _formatDictionaryTermGlossaryImage(data, context, entry) {
+        const dictionary = entry.dictionary;
+        const {path, width: preferredWidth, height: preferredHeight, title, description, pixelated} = data;
+        if (context.media.has(path)) {
+            // Already exists
+            return data;
+        }
+
+        let errorSource = entry.expression;
+        if (entry.reading.length > 0) {
+            errorSource += ` (${entry.reading});`;
+        }
+
+        const file = context.archive.file(path);
+        if (file === null) {
+            throw new Error(`Could not find image at path ${JSON.stringify(path)} for ${errorSource}`);
+        }
+
+        const content = await file.async('base64');
+        const mediaType = mediaUtility.getImageMediaTypeFromFileName(path);
+        if (mediaType === null) {
+            throw new Error(`Could not determine media type for image at path ${JSON.stringify(path)} for ${errorSource}`);
+        }
+
+        let image;
+        try {
+            image = await mediaUtility.loadImageBase64(mediaType, content);
+        } catch (e) {
+            throw new Error(`Could not load image at path ${JSON.stringify(path)} for ${errorSource}`);
+        }
+
+        const width = image.naturalWidth;
+        const height = image.naturalHeight;
+
+        // Create image data
+        const mediaData = {
+            dictionary,
+            path,
+            mediaType,
+            width,
+            height,
+            content
+        };
+        context.media.set(path, mediaData);
+
+        // Create new data
+        const newData = {
+            type: 'image',
+            path,
+            width,
+            height
+        };
+        if (typeof preferredWidth === 'number') { newData.preferredWidth = preferredWidth; }
+        if (typeof preferredHeight === 'number') { newData.preferredHeight = preferredHeight; }
+        if (typeof title === 'string') { newData.title = title; }
+        if (typeof description === 'string') { newData.description = description; }
+        if (typeof pixelated === 'boolean') { newData.pixelated = pixelated; }
+
+        return newData;
+    }
 }
diff --git a/ext/bg/js/media-utility.js b/ext/bg/js/media-utility.js
new file mode 100644
index 00000000..1f93b2b4
--- /dev/null
+++ b/ext/bg/js/media-utility.js
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2020  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/>.
+ */
+
+/**
+ * mediaUtility is an object containing helper methods related to media processing.
+ */
+const mediaUtility = (() => {
+    /**
+     * Gets the file extension of a file path. URL search queries and hash
+     * fragments are not handled.
+     * @param path The path to the file.
+     * @returns The file extension, including the '.', or an empty string
+     *   if there is no file extension.
+     */
+    function getFileNameExtension(path) {
+        const match = /\.[^./\\]*$/.exec(path);
+        return match !== null ? match[0] : '';
+    }
+
+    /**
+     * Gets an image file's media type using a file path.
+     * @param path The path to the file.
+     * @returns The media type string if it can be determined from the file path,
+     *   otherwise null.
+     */
+    function getImageMediaTypeFromFileName(path) {
+        switch (getFileNameExtension(path).toLowerCase()) {
+            case '.apng':
+                return 'image/apng';
+            case '.bmp':
+                return 'image/bmp';
+            case '.gif':
+                return 'image/gif';
+            case '.ico':
+            case '.cur':
+                return 'image/x-icon';
+            case '.jpg':
+            case '.jpeg':
+            case '.jfif':
+            case '.pjpeg':
+            case '.pjp':
+                return 'image/jpeg';
+            case '.png':
+                return 'image/png';
+            case '.svg':
+                return 'image/svg+xml';
+            case '.tif':
+            case '.tiff':
+                return 'image/tiff';
+            case '.webp':
+                return 'image/webp';
+            default:
+                return null;
+        }
+    }
+
+    /**
+     * Attempts to load an image using a base64 encoded content and a media type.
+     * @param mediaType The media type for the image content.
+     * @param content The binary content for the image, encoded in base64.
+     * @returns A Promise which resolves with an HTMLImageElement instance on
+     *   successful load, otherwise an error is thrown.
+     */
+    function loadImageBase64(mediaType, content) {
+        return new Promise((resolve, reject) => {
+            const image = new Image();
+            const eventListeners = new EventListenerCollection();
+            eventListeners.addEventListener(image, 'load', () => {
+                eventListeners.removeAllEventListeners();
+                resolve(image);
+            }, false);
+            eventListeners.addEventListener(image, 'error', () => {
+                eventListeners.removeAllEventListeners();
+                reject(new Error('Image failed to load'));
+            }, false);
+            image.src = `data:${mediaType};base64,${content}`;
+        });
+    }
+
+    return {
+        getImageMediaTypeFromFileName,
+        loadImageBase64
+    };
+})();