Support WebP image types (#388)

Dockerfile

@@ -1,17 +1,38 @@
 FROM node:18 AS builder
 WORKDIR /usr/app
+
 COPY package*.json ./
 RUN npm ci
+
 COPY tsconfig.json .
 COPY src ./src
+
 RUN npm run build
 
 FROM node:18
-RUN apt-get update \
-  && apt-get -y install exiftool \
-  && rm -rf /var/lib/apt/lists/*
+ENV EXIFTOOL_VERSION 12.60
+
+# Install exiftool: https://exiftool.org/install.html#Unix
+RUN wget -O exiftool.tar.gz "https://exiftool.org/Image-ExifTool-${EXIFTOOL_VERSION}.tar.gz" && \
+  tar -xvf exiftool.tar.gz && \
+  cd Image-ExifTool-${EXIFTOOL_VERSION} && \
+  perl Makefile.PL && \
+  make && \
+  make test && \
+  make install && \
+  cd .. \
+  rm exiftool.tar.gz
+
+# Fix "detected dubious ownership" issue:
+# https://github.com/actions/runner-images/issues/6775#issuecomment-1410270956
+# https://github.com/actions/checkout/issues/1169
+RUN git config --system --add safe.directory /github/workspace
+
 WORKDIR /usr/app
+
 COPY package*.json ./
 RUN npm ci --only=production
+
 COPY --from=builder /usr/app/lib ./lib
+
 CMD ["node", "/usr/app/lib/main.js"]

README.md

@@ -8,7 +8,7 @@
 
 ## Features
 
-- filters PNG and JPEG files in a commit or pull request
+- filters PNG, JPEG, and WebP files in a commit or pull request
 - optionally scales images proportionally
 - sets Exif metadata to prevent duplicate compressions
 - pushes commit with compression metrics

src/exif.ts

@@ -6,7 +6,7 @@ export enum Tag {
 }
 
 export default class Exif {
-  private static COMMAND = '/usr/bin/exiftool'
+  private static COMMAND = '/usr/local/bin/exiftool'
 
   constructor(private filename: string) {}
 

src/images.ts

@@ -3,7 +3,8 @@ import {existsSync} from 'fs'
 import {getType} from 'mime'
 import Image from './image'
 
-const SUPPORTED_MIME_TYPES = ['image/jpeg', 'image/png']
+/** @see https://tinypng.com/developers/reference#compressing-images */
+const SUPPORTED_MIME_TYPES = ['image/jpeg', 'image/png', 'image/webp']
 
 export default class Images implements Iterable<Image> {
   private readonly filenames = new Set<string>()