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improvement(ui): thumbnail generaiton uses now mime_type (ex: for .ogg containers can be music or video)

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- improve also error handling (shows reason of thumbnail generation failure)
This commit is contained in:
Edouard Vanbelle
2026-05-04 10:54:07 +02:00
parent 1d2085457e
commit e802cdb268
3 changed files with 68 additions and 54 deletions
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static/js/features/thumbnail.js
+63 -51
View File
@@ -1,5 +1,7 @@
import { getCsrfHeaders } from '../core/csrf.js';
/** @import {FileInfo} from '../core/types.js' */
/** @type {typeof import('../vendors/pdf.min.d.ts') | null} */
let _pdfjsLib = null;
@@ -18,14 +20,19 @@ async function getPdfjsLib() {
}
export const thumbnail = {
SUPPORTED_CLASS: ['image-icon', 'pdf-icon', 'video-icon'],
SUPPORTED_MIME_TYPE: [/^image\//, /^application\/pdf$/, /^video\//],
/**
*
* @param {String} iconSpecialClass
* @param {Object} file
* @returns {boolean}
*/
canHandle(iconSpecialClass) {
return this.SUPPORTED_CLASS.includes(iconSpecialClass);
canHandle(file) {
for (const re of this.SUPPORTED_MIME_TYPE) {
if (file.mime_type.match(re)) {
return true;
}
}
return false;
},
// TODO: use these informations from server ?
@@ -102,7 +109,7 @@ export const thumbnail = {
/**
*
* @param {Object} file
* @param {FileInfo} file
* @param {string} source
* @returns {Promise<ImageBitmap>}
*
@@ -110,58 +117,55 @@ export const thumbnail = {
*/
async _sourceToBitmap(file, source) {
// FIXME: more efficient to use mimetype
switch (file.icon_special_class) {
case 'image-icon': {
const response = await fetch(source);
if (!response.ok) throw new Error(`failed to fetch: ${response.status}`);
const blob = await response.blob();
return createImageBitmap(blob);
}
case 'pdf-icon': {
const pdfjsLib = await getPdfjsLib();
const pdf = await pdfjsLib.getDocument(source).promise;
const page = await pdf.getPage(1);
const viewport = page.getViewport({ scale: 1 });
const canvas = document.createElement('canvas');
canvas.width = viewport.width;
canvas.height = viewport.height;
await page.render({ canvasContext: canvas.getContext('2d'), viewport }).promise;
return createImageBitmap(canvas);
}
case 'video-icon': {
return new Promise((resolve, reject) => {
const video = document.createElement('video');
video.src = source;
video.muted = true;
video.preload = 'metadata';
video.onloadedmetadata = () => {
// seek to 1/3 of video to take snapshot
video.currentTime = video.duration / 3;
};
video.onseeked = async () => {
const bitmap = await createImageBitmap(video);
video.pause();
video.removeAttribute('src'); // hack to close network connection
video.load();
resolve(bitmap);
};
video.onerror = reject;
});
}
default:
throw new Error(`unknown type: ${file.icon_special_class} for file ${file.name}`);
if (file.mime_type.startsWith('image/')) {
const response = await fetch(source);
if (!response.ok) throw new Error(`failed to fetch: ${response.status}`);
const blob = await response.blob();
return createImageBitmap(blob);
}
if (file.mime_type === 'application/pdf') {
const pdfjsLib = await getPdfjsLib();
const pdf = await pdfjsLib.getDocument(source).promise;
const page = await pdf.getPage(1);
const viewport = page.getViewport({ scale: 1 });
const canvas = document.createElement('canvas');
canvas.width = viewport.width;
canvas.height = viewport.height;
await page.render({ canvasContext: canvas.getContext('2d'), viewport }).promise;
return createImageBitmap(canvas);
}
if (file.mime_type.startsWith('video/')) {
return new Promise((resolve, reject) => {
const video = document.createElement('video');
video.src = source;
video.muted = true;
video.preload = 'metadata';
video.onloadedmetadata = () => {
// seek to 1/3 of video to take snapshot
video.currentTime = video.duration / 3;
};
video.onseeked = async () => {
const bitmap = await createImageBitmap(video);
video.pause();
video.removeAttribute('src'); // hack to close network connection
video.load();
resolve(bitmap);
};
video.onerror = reject;
});
}
throw new Error(`unsupported mime type: ${file.mime_type} for file ${file.name}`);
},
/**
* generateThumbnail and update image
*
* @param {Object} file the source of the image
* @param {(dataURL: string) => void} [onIconGenerated] the callback once thumbnail is generated
* @param {(dataURL: string) => void} [onPreviewGenerated] the callback once thumbnail is generated
* @param {((dataURL: string) => void) | null} [onIconGenerated] the callback once thumbnail is generated
* @param {((dataURL: string) => void) | null} [onPreviewGenerated] the callback once thumbnail is generated
*
* @private
*/
@@ -207,7 +211,7 @@ export const thumbnail = {
* At most MAX_CONCURRENT generations run simultaneously; excess calls are
* queued and resume automatically as slots free up.
*
* @param {Object} file
* @param {FileInfo} file
* @param {((dataURL: string) => void) | null} [onIconGenerated]
* @param {((dataURL: string) => void) | null} [onPreviewGenerated]
* @returns {Promise<void>}
@@ -219,6 +223,14 @@ export const thumbnail = {
this._activeGenerates++;
try {
await this._generate(file, onIconGenerated, onPreviewGenerated);
} catch (err) {
if (err instanceof Event) {
console.warn(`generation of thumbnail for ${file.name} failed: `, err.target.error);
} else if (err instanceof Error) {
console.warn(`generation of thumbnail for ${file.name} failed: `, err.message);
} else {
console.warn(`generation of thumbnail for ${file.name} failed: `, err);
}
} finally {
this._activeGenerates--;
if (this._generateQueue.length > 0) {