feat: custom image proxy (#3056)

.gitignore

@@ -64,3 +64,6 @@ cypress/screenshots
 
 # TS Build Info
 tsconfig.tsbuildinfo
+
+# Config Cache Directory
+config/cache

docs/using-overseerr/settings/README.md

@@ -40,6 +40,14 @@ If you enable this setting and find yourself unable to access Overseerr, you can
 
 This setting is **disabled** by default.
 
+### Enable Image Caching
+
+When enabled, Overseerr will proxy and cache images from pre-configured sources (such as TMDB). This can use a significant amount of disk space.
+
+Images are saved in the `config/cache/images` and stale images are cleared out every 24 hours.
+
+You should enable this if you are having issues with loading images directly from TMDB in your browser.
+
 ### Display Language
 
 Set the default display language for Overseerr. Users can override this setting in their user settings.

overseerr-api.yml

@@ -2475,29 +2475,44 @@ paths:
           content:
             application/json:
               schema:
-                type: array
-                items:
-                  type: object
-                  properties:
-                    id:
-                      type: string
-                      example: cache-id
-                    name:
-                      type: string
-                      example: cache name
-                    stats:
+                type: object
+                properties:
+                  imageCache:
+                    type: object
+                    properties:
+                      tmdb:
+                        type: object
+                        properties:
+                          size:
+                            type: number
+                            example: 123456
+                          imageCount:
+                            type: number
+                            example: 123
+                  apiCaches:
+                    type: array
+                    items:
                       type: object
                       properties:
-                        hits:
-                          type: number
-                        misses:
-                          type: number
-                        keys:
-                          type: number
-                        ksize:
-                          type: number
-                        vsize:
-                          type: number
+                        id:
+                          type: string
+                          example: cache-id
+                        name:
+                          type: string
+                          example: cache name
+                        stats:
+                          type: object
+                          properties:
+                            hits:
+                              type: number
+                            misses:
+                              type: number
+                            keys:
+                              type: number
+                            ksize:
+                              type: number
+                            vsize:
+                              type: number
   /settings/cache/{cacheId}/flush:
     post:
       summary: Flush a specific cache

server/index.ts

@@ -17,6 +17,7 @@ import WebPushAgent from '@server/lib/notifications/agents/webpush';
 import { getSettings } from '@server/lib/settings';
 import logger from '@server/logger';
 import routes from '@server/routes';
+import imageproxy from '@server/routes/imageproxy';
 import { getAppVersion } from '@server/utils/appVersion';
 import restartFlag from '@server/utils/restartFlag';
 import { getClientIp } from '@supercharge/request-ip';
@@ -176,6 +177,9 @@ app
       next();
     });
     server.use('/api/v1', routes);
+
+    server.use('/imageproxy', imageproxy);
+
     server.get('*', (req, res) => handle(req, res));
     server.use(
       (

server/interfaces/api/settingsInterfaces.ts

@@ -51,6 +51,11 @@ export interface CacheItem {
   };
 }
 
+export interface CacheResponse {
+  apiCaches: CacheItem[];
+  imageCache: Record<'tmdb', { size: number; imageCount: number }>;
+}
+
 export interface StatusResponse {
   version: string;
   commitTag: string;

server/job/schedule.ts

@@ -1,4 +1,5 @@
 import downloadTracker from '@server/lib/downloadtracker';
+import ImageProxy from '@server/lib/imageproxy';
 import { plexFullScanner, plexRecentScanner } from '@server/lib/scanners/plex';
 import { radarrScanner } from '@server/lib/scanners/radarr';
 import { sonarrScanner } from '@server/lib/scanners/sonarr';
@@ -133,5 +134,21 @@ export const startJobs = (): void => {
     }),
   });
 
+  // Run image cache cleanup every 5 minutes
+  scheduledJobs.push({
+    id: 'image-cache-cleanup',
+    name: 'Image Cache Cleanup',
+    type: 'process',
+    interval: 'long',
+    cronSchedule: jobs['image-cache-cleanup'].schedule,
+    job: schedule.scheduleJob(jobs['image-cache-cleanup'].schedule, () => {
+      logger.info('Starting scheduled job: Image Cache Cleanup', {
+        label: 'Jobs',
+      });
+      // Clean TMDB image cache
+      ImageProxy.clearCache('tmdb');
+    }),
+  });
+
   logger.info('Scheduled jobs loaded', { label: 'Jobs' });
 };

server/lib/imageproxy.ts

@@ -0,0 +1,268 @@
+import logger from '@server/logger';
+import axios from 'axios';
+import rateLimit, { type rateLimitOptions } from 'axios-rate-limit';
+import { createHash } from 'crypto';
+import { promises } from 'fs';
+import path, { join } from 'path';
+
+type ImageResponse = {
+  meta: {
+    revalidateAfter: number;
+    curRevalidate: number;
+    isStale: boolean;
+    etag: string;
+    extension: string;
+    cacheKey: string;
+    cacheMiss: boolean;
+  };
+  imageBuffer: Buffer;
+};
+
+class ImageProxy {
+  public static async clearCache(key: string) {
+    let deletedImages = 0;
+    const cacheDirectory = path.join(
+      __dirname,
+      '../../config/cache/images/',
+      key
+    );
+
+    const files = await promises.readdir(cacheDirectory);
+
+    for (const file of files) {
+      const filePath = path.join(cacheDirectory, file);
+      const stat = await promises.lstat(filePath);
+
+      if (stat.isDirectory()) {
+        const imageFiles = await promises.readdir(filePath);
+
+        for (const imageFile of imageFiles) {
+          const [, expireAtSt] = imageFile.split('.');
+          const expireAt = Number(expireAtSt);
+          const now = Date.now();
+
+          if (now > expireAt) {
+            await promises.rm(path.join(filePath, imageFile));
+            deletedImages += 1;
+          }
+        }
+      }
+    }
+
+    logger.info(`Cleared ${deletedImages} stale image(s) from cache`, {
+      label: 'Image Cache',
+    });
+  }
+
+  public static async getImageStats(
+    key: string
+  ): Promise<{ size: number; imageCount: number }> {
+    const cacheDirectory = path.join(
+      __dirname,
+      '../../config/cache/images/',
+      key
+    );
+
+    const imageTotalSize = await ImageProxy.getDirectorySize(cacheDirectory);
+    const imageCount = await ImageProxy.getImageCount(cacheDirectory);
+
+    return {
+      size: imageTotalSize,
+      imageCount,
+    };
+  }
+
+  private static async getDirectorySize(dir: string): Promise<number> {
+    const files = await promises.readdir(dir, {
+      withFileTypes: true,
+    });
+
+    const paths = files.map(async (file) => {
+      const path = join(dir, file.name);
+
+      if (file.isDirectory()) return await ImageProxy.getDirectorySize(path);
+
+      if (file.isFile()) {
+        const { size } = await promises.stat(path);
+
+        return size;
+      }
+
+      return 0;
+    });
+
+    return (await Promise.all(paths))
+      .flat(Infinity)
+      .reduce((i, size) => i + size, 0);
+  }
+
+  private static async getImageCount(dir: string) {
+    const files = await promises.readdir(dir);
+
+    return files.length;
+  }
+
+  private axios;
+  private cacheVersion;
+  private key;
+
+  constructor(
+    key: string,
+    baseUrl: string,
+    options: {
+      cacheVersion?: number;
+      rateLimitOptions?: rateLimitOptions;
+    } = {}
+  ) {
+    this.cacheVersion = options.cacheVersion ?? 1;
+    this.key = key;
+    this.axios = axios.create({
+      baseURL: baseUrl,
+    });
+
+    if (options.rateLimitOptions) {
+      this.axios = rateLimit(this.axios, options.rateLimitOptions);
+    }
+  }
+
+  public async getImage(path: string): Promise<ImageResponse> {
+    const cacheKey = this.getCacheKey(path);
+
+    const imageResponse = await this.get(cacheKey);
+
+    if (!imageResponse) {
+      const newImage = await this.set(path, cacheKey);
+
+      if (!newImage) {
+        throw new Error('Failed to load image');
+      }
+
+      return newImage;
+    }
+
+    // If the image is stale, we will revalidate it in the background.
+    if (imageResponse.meta.isStale) {
+      this.set(path, cacheKey);
+    }
+
+    return imageResponse;
+  }
+
+  private async get(cacheKey: string): Promise<ImageResponse | null> {
+    try {
+      const directory = join(this.getCacheDirectory(), cacheKey);
+      const files = await promises.readdir(directory);
+      const now = Date.now();
+
+      for (const file of files) {
+        const [maxAgeSt, expireAtSt, etag, extension] = file.split('.');
+        const buffer = await promises.readFile(join(directory, file));
+        const expireAt = Number(expireAtSt);
+        const maxAge = Number(maxAgeSt);
+
+        return {
+          meta: {
+            curRevalidate: maxAge,
+            revalidateAfter: maxAge * 1000 + now,
+            isStale: now > expireAt,
+            etag,
+            extension,
+            cacheKey,
+            cacheMiss: false,
+          },
+          imageBuffer: buffer,
+        };
+      }
+    } catch (e) {
+      // No files. Treat as empty cache.
+    }
+
+    return null;
+  }
+
+  private async set(
+    path: string,
+    cacheKey: string
+  ): Promise<ImageResponse | null> {
+    try {
+      const directory = join(this.getCacheDirectory(), cacheKey);
+      const response = await this.axios.get(path, {
+        responseType: 'arraybuffer',
+      });
+
+      const buffer = Buffer.from(response.data, 'binary');
+      const extension = path.split('.').pop() ?? '';
+      const maxAge = Number(response.headers['cache-control'].split('=')[1]);
+      const expireAt = Date.now() + maxAge * 1000;
+      const etag = response.headers.etag.replace(/"/g, '');
+
+      await this.writeToCacheDir(
+        directory,
+        extension,
+        maxAge,
+        expireAt,
+        buffer,
+        etag
+      );
+
+      return {
+        meta: {
+          curRevalidate: maxAge,
+          revalidateAfter: expireAt,
+          isStale: false,
+          etag,
+          extension,
+          cacheKey,
+          cacheMiss: true,
+        },
+        imageBuffer: buffer,
+      };
+    } catch (e) {
+      logger.debug('Something went wrong caching image.', {
+        label: 'Image Cache',
+        errorMessage: e.message,
+      });
+      return null;
+    }
+  }
+
+  private async writeToCacheDir(
+    dir: string,
+    extension: string,
+    maxAge: number,
+    expireAt: number,
+    buffer: Buffer,
+    etag: string
+  ) {
+    const filename = join(dir, `${maxAge}.${expireAt}.${etag}.${extension}`);
+
+    await promises.rm(dir, { force: true, recursive: true }).catch(() => {
+      // do nothing
+    });
+
+    await promises.mkdir(dir, { recursive: true });
+    await promises.writeFile(filename, buffer);
+  }
+
+  private getCacheKey(path: string) {
+    return this.getHash([this.key, this.cacheVersion, path]);
+  }
+
+  private getHash(items: (string | number | Buffer)[]) {
+    const hash = createHash('sha256');
+    for (const item of items) {
+      if (typeof item === 'number') hash.update(String(item));
+      else {
+        hash.update(item);
+      }
+    }
+    // See https://en.wikipedia.org/wiki/Base64#Filenames
+    return hash.digest('base64').replace(/\//g, '-');
+  }
+
+  private getCacheDirectory() {
+    return path.join(__dirname, '../../config/cache/images/', this.key);
+  }
+}
+
+export default ImageProxy;

server/lib/settings.ts

@@ -247,7 +247,8 @@ export type JobId =
   | 'radarr-scan'
   | 'sonarr-scan'
   | 'download-sync'
-  | 'download-sync-reset';
+  | 'download-sync-reset'
+  | 'image-cache-cleanup';
 
 interface AllSettings {
   clientId: string;
@@ -414,6 +415,9 @@ class Settings {
         'download-sync-reset': {
           schedule: '0 0 1 * * *',
         },
+        'image-cache-cleanup': {
+          schedule: '0 0 5 * * *',
+        },
       },
     };
     if (initialSettings) {

server/routes/imageproxy.ts

@@ -0,0 +1,39 @@
+import ImageProxy from '@server/lib/imageproxy';
+import logger from '@server/logger';
+import { Router } from 'express';
+
+const router = Router();
+const tmdbImageProxy = new ImageProxy('tmdb', 'https://image.tmdb.org', {
+  rateLimitOptions: {
+    maxRequests: 20,
+    maxRPS: 50,
+  },
+});
+
+/**
+ * Image Proxy
+ */
+router.get('/*', async (req, res) => {
+  const imagePath = req.path.replace('/image', '');
+  try {
+    const imageData = await tmdbImageProxy.getImage(imagePath);
+
+    res.writeHead(200, {
+      'Content-Type': `image/${imageData.meta.extension}`,
+      'Content-Length': imageData.imageBuffer.length,
+      'Cache-Control': `public, max-age=${imageData.meta.curRevalidate}`,
+      'OS-Cache-Key': imageData.meta.cacheKey,
+      'OS-Cache-Status': imageData.meta.cacheMiss ? 'MISS' : 'HIT',
+    });
+
+    res.end(imageData.imageBuffer);
+  } catch (e) {
+    logger.error('Failed to proxy image', {
+      imagePath,
+      errorMessage: e.message,
+    });
+    res.status(500).send();
+  }
+});
+
+export default router;

server/routes/settings/index.ts

@@ -14,9 +14,10 @@ import type {
 import { scheduledJobs } from '@server/job/schedule';
 import type { AvailableCacheIds } from '@server/lib/cache';
 import cacheManager from '@server/lib/cache';
+import ImageProxy from '@server/lib/imageproxy';
 import { Permission } from '@server/lib/permissions';
 import { plexFullScanner } from '@server/lib/scanners/plex';
-import type { MainSettings } from '@server/lib/settings';
+import type { JobId, MainSettings } from '@server/lib/settings';
 import { getSettings } from '@server/lib/settings';
 import logger from '@server/logger';
 import { isAuthenticated } from '@server/middleware/auth';
@@ -491,7 +492,7 @@ settingsRoutes.post<{ jobId: string }>('/jobs/:jobId/run', (req, res, next) => {
   });
 });
 
-settingsRoutes.post<{ jobId: string }>(
+settingsRoutes.post<{ jobId: JobId }>(
   '/jobs/:jobId/cancel',
   (req, res, next) => {
     const scheduledJob = scheduledJobs.find(
@@ -518,7 +519,7 @@ settingsRoutes.post<{ jobId: string }>(
   }
 );
 
-settingsRoutes.post<{ jobId: string }>(
+settingsRoutes.post<{ jobId: JobId }>(
   '/jobs/:jobId/schedule',
   (req, res, next) => {
     const scheduledJob = scheduledJobs.find(
@@ -553,16 +554,23 @@ settingsRoutes.post<{ jobId: string }>(
   }
 );
 
-settingsRoutes.get('/cache', (req, res) => {
-  const caches = cacheManager.getAllCaches();
+settingsRoutes.get('/cache', async (_req, res) => {
+  const cacheManagerCaches = cacheManager.getAllCaches();
 
-  return res.status(200).json(
-    Object.values(caches).map((cache) => ({
-      id: cache.id,
-      name: cache.name,
-      stats: cache.getStats(),
-    }))
-  );
+  const apiCaches = Object.values(cacheManagerCaches).map((cache) => ({
+    id: cache.id,
+    name: cache.name,
+    stats: cache.getStats(),
+  }));
+
+  const tmdbImageCache = await ImageProxy.getImageStats('tmdb');
+
+  return res.status(200).json({
+    apiCaches,
+    imageCache: {
+      tmdb: tmdbImageCache,
+    },
+  });
 });
 
 settingsRoutes.post<{ cacheId: AvailableCacheIds }>(

src/components/Common/CachedImage/index.tsx

@@ -1,18 +1,27 @@
 import useSettings from '@app/hooks/useSettings';
-import type { ImageProps } from 'next/image';
+import type { ImageLoader, ImageProps } from 'next/image';
 import Image from 'next/image';
 
+const imageLoader: ImageLoader = ({ src }) => src;
+
 /**
  * The CachedImage component should be used wherever
  * we want to offer the option to locally cache images.
- *
- * It uses the `next/image` Image component but overrides
- * the `unoptimized` prop based on the application setting `cacheImages`.
  **/
-const CachedImage = (props: ImageProps) => {
+const CachedImage = ({ src, ...props }: ImageProps) => {
   const { currentSettings } = useSettings();
 
-  return <Image unoptimized={!currentSettings.cacheImages} {...props} />;
+  let imageUrl = src;
+
+  if (typeof imageUrl === 'string' && imageUrl.startsWith('http')) {
+    const parsedUrl = new URL(imageUrl);
+
+    if (parsedUrl.host === 'image.tmdb.org' && currentSettings.cacheImages) {
+      imageUrl = imageUrl.replace('https://image.tmdb.org', '/imageproxy');
+    }
+  }
+
+  return <Image unoptimized loader={imageLoader} src={imageUrl} {...props} />;
 };
 
 export default CachedImage;

src/components/CompanyCard/index.tsx

@@ -1,3 +1,4 @@
+import CachedImage from '@app/components/Common/CachedImage';
 import Link from 'next/link';
 import { useState } from 'react';
 
@@ -30,11 +31,15 @@ const CompanyCard = ({ image, url, name }: CompanyCardProps) => {
         role="link"
         tabIndex={0}
       >
-        <img
-          src={image}
-          alt={name}
-          className="relative z-40 max-h-full max-w-full"
-        />
+        <div className="relative h-full w-full">
+          <CachedImage
+            src={image}
+            alt={name}
+            className="relative z-40 h-full w-full"
+            layout="fill"
+            objectFit="contain"
+          />
+        </div>
         <div
           className={`absolute bottom-0 left-0 right-0 z-0 h-12 rounded-b-xl bg-gradient-to-t ${
             isHovered ? 'from-gray-800' : 'from-gray-900'

src/components/MediaSlider/ShowMoreCard/index.tsx

@@ -1,6 +1,8 @@
+import TitleCard from '@app/components/TitleCard';
 import { ArrowCircleRightIcon } from '@heroicons/react/solid';
 import Link from 'next/link';
 import { useState } from 'react';
+import { useInView } from 'react-intersection-observer';
 import { defineMessages, useIntl } from 'react-intl';
 
 const messages = defineMessages({
@@ -15,6 +17,18 @@ interface ShowMoreCardProps {
 const ShowMoreCard = ({ url, posters }: ShowMoreCardProps) => {
   const intl = useIntl();
   const [isHovered, setHovered] = useState(false);
+  const { ref, inView } = useInView({
+    triggerOnce: true,
+  });
+
+  if (!inView) {
+    return (
+      <div ref={ref}>
+        <TitleCard.Placeholder />
+      </div>
+    );
+  }
+
   return (
     <Link href={url}>
       <a

src/components/Settings/SettingsJobsCache/index.tsx

@@ -11,7 +11,10 @@ import { formatBytes } from '@app/utils/numberHelpers';
 import { Transition } from '@headlessui/react';
 import { PlayIcon, StopIcon, TrashIcon } from '@heroicons/react/outline';
 import { PencilIcon } from '@heroicons/react/solid';
-import type { CacheItem } from '@server/interfaces/api/settingsInterfaces';
+import type {
+  CacheItem,
+  CacheResponse,
+} from '@server/interfaces/api/settingsInterfaces';
 import type { JobId } from '@server/lib/settings';
 import axios from 'axios';
 import cronstrue from 'cronstrue/i18n';
@@ -54,6 +57,7 @@ const messages: { [messageName: string]: MessageDescriptor } = defineMessages({
   'sonarr-scan': 'Sonarr Scan',
   'download-sync': 'Download Sync',
   'download-sync-reset': 'Download Sync Reset',
+  'image-cache-cleanup': 'Image Cache Cleanup',
   editJobSchedule: 'Modify Job',
   jobScheduleEditSaved: 'Job edited successfully!',
   jobScheduleEditFailed: 'Something went wrong while saving the job.',
@@ -63,6 +67,11 @@ const messages: { [messageName: string]: MessageDescriptor } = defineMessages({
     'Every {jobScheduleHours, plural, one {hour} other {{jobScheduleHours} hours}}',
   editJobScheduleSelectorMinutes:
     'Every {jobScheduleMinutes, plural, one {minute} other {{jobScheduleMinutes} minutes}}',
+  imagecache: 'Image Cache',
+  imagecacheDescription:
+    'When enabled in settings, Overseerr will proxy and cache images from pre-configured external sources. Cached images are saved into your config folder. You can find the files in <code>{appDataPath}/cache/images</code>.',
+  imagecachecount: 'Images Cached',
+  imagecachesize: 'Total Cache Size',
 });
 
 interface Job {
@@ -128,7 +137,8 @@ const SettingsJobs = () => {
   } = useSWR<Job[]>('/api/v1/settings/jobs', {
     refreshInterval: 5000,
   });
-  const { data: cacheData, mutate: cacheRevalidate } = useSWR<CacheItem[]>(
+  const { data: appData } = useSWR('/api/v1/status/appdata');
+  const { data: cacheData, mutate: cacheRevalidate } = useSWR<CacheResponse>(
     '/api/v1/settings/cache',
     {
       refreshInterval: 10000,
@@ -430,7 +440,7 @@ const SettingsJobs = () => {
             </tr>
           </thead>
           <Table.TBody>
-            {cacheData?.map((cache) => (
+            {cacheData?.apiCaches.map((cache) => (
               <tr key={`cache-list-${cache.id}`}>
                 <Table.TD>{cache.name}</Table.TD>
                 <Table.TD>{intl.formatNumber(cache.stats.hits)}</Table.TD>
@@ -449,6 +459,41 @@ const SettingsJobs = () => {
           </Table.TBody>
         </Table>
       </div>
+      <div>
+        <h3 className="heading">{intl.formatMessage(messages.imagecache)}</h3>
+        <p className="description">
+          {intl.formatMessage(messages.imagecacheDescription, {
+            code: (msg: React.ReactNode) => (
+              <code className="bg-opacity-50">{msg}</code>
+            ),
+            appDataPath: appData ? appData.appDataPath : '/app/config',
+          })}
+        </p>
+      </div>
+      <div className="section">
+        <Table>
+          <thead>
+            <tr>
+              <Table.TH>{intl.formatMessage(messages.cachename)}</Table.TH>
+              <Table.TH>
+                {intl.formatMessage(messages.imagecachecount)}
+              </Table.TH>
+              <Table.TH>{intl.formatMessage(messages.imagecachesize)}</Table.TH>
+            </tr>
+          </thead>
+          <Table.TBody>
+            <tr>
+              <Table.TD>The Movie Database (tmdb)</Table.TD>
+              <Table.TD>
+                {intl.formatNumber(cacheData?.imageCache.tmdb.imageCount ?? 0)}
+              </Table.TD>
+              <Table.TD>
+                {formatBytes(cacheData?.imageCache.tmdb.size ?? 0)}
+              </Table.TD>
+            </tr>
+          </Table.TBody>
+        </Table>
+      </div>
     </>
   );
 };

src/components/Settings/SettingsMain.tsx

@@ -46,7 +46,7 @@ const messages = defineMessages({
     'Do NOT enable this setting unless you understand what you are doing!',
   cacheImages: 'Enable Image Caching',
   cacheImagesTip:
-    'Cache and serve optimized images (requires a significant amount of disk space)',
+    'Cache externally sourced images (requires a significant amount of disk space)',
   trustProxy: 'Enable Proxy Support',
   trustProxyTip:
     'Allow Overseerr to correctly register client IP addresses behind a proxy',

src/i18n/locale/en.json

@@ -644,6 +644,11 @@
   "components.Settings.SettingsJobsCache.editJobScheduleSelectorHours": "Every {jobScheduleHours, plural, one {hour} other {{jobScheduleHours} hours}}",
   "components.Settings.SettingsJobsCache.editJobScheduleSelectorMinutes": "Every {jobScheduleMinutes, plural, one {minute} other {{jobScheduleMinutes} minutes}}",
   "components.Settings.SettingsJobsCache.flushcache": "Flush Cache",
+  "components.Settings.SettingsJobsCache.image-cache-cleanup": "Image Cache Cleanup",
+  "components.Settings.SettingsJobsCache.imagecache": "Image Cache",
+  "components.Settings.SettingsJobsCache.imagecacheDescription": "When enabled in settings, Overseerr will proxy and cache images from pre-configured external sources. Cached images are saved into your config folder. You can find the files in <code>{appDataPath}/cache/images</code>.",
+  "components.Settings.SettingsJobsCache.imagecachecount": "Images Cached",
+  "components.Settings.SettingsJobsCache.imagecachesize": "Total Cache Size",
   "components.Settings.SettingsJobsCache.jobScheduleEditFailed": "Something went wrong while saving the job.",
   "components.Settings.SettingsJobsCache.jobScheduleEditSaved": "Job edited successfully!",
   "components.Settings.SettingsJobsCache.jobcancelled": "{jobname} canceled.",
@@ -754,7 +759,7 @@
   "components.Settings.applicationTitle": "Application Title",
   "components.Settings.applicationurl": "Application URL",
   "components.Settings.cacheImages": "Enable Image Caching",
-  "components.Settings.cacheImagesTip": "Cache and serve optimized images (requires a significant amount of disk space)",
+  "components.Settings.cacheImagesTip": "Cache externally sourced images (requires a significant amount of disk space)",
   "components.Settings.cancelscan": "Cancel Scan",
   "components.Settings.copied": "Copied API key to clipboard.",
   "components.Settings.csrfProtection": "Enable CSRF Protection",