chore: update Go dependencies

A second SIGINT forces shutdown, as usual.

.github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/stale.yml

@@ -1,5 +1,5 @@
 # Number of days of inactivity before an issue becomes stale
-daysUntilStale: 60
+daysUntilStale: 15
 # Number of days of inactivity before a stale issue is closed
 daysUntilClose: 7
 # Issues with these labels will never be considered stale

.github/workflows/continuous_delivery.yml

@@ -11,13 +11,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v2
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
       - name: Checkout source code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Log in to Docker Hub Container Registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}

.github/workflows/continuous_integration.yml

@@ -14,10 +14,15 @@ jobs:
     name: Lint
     runs-on: ubuntu-latest
     steps:
+      - name: Setup Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.20'
+          cache: false
       - name: Checkout source code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Run linters
-        uses: golangci/golangci-lint-action@v2
+        uses: golangci/golangci-lint-action@v3
         with:
           version: v1.51.2
 
@@ -30,11 +35,11 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v2
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
       - name: Checkout source code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Build testing environment
         run: make build build-tests
       - name: Run tests

Makefile

@@ -33,6 +33,7 @@ API_TIMEOUT=30s
 API_ROOT_PATH=/
 API_TRACE_HEADER=Gotenberg-Trace
 API_DISABLE_HEALTH_CHECK_LOGGING=false
+CHROMIUM_FAILED_STARTS_THRESHOLD=5
 CHROMIUM_INCOGNITO=false
 CHROMIUM_ALLOW_INSECURE_LOCALHOST=false
 CHROMIUM_IGNORE_CERTIFICATE_ERRORS=false
@@ -47,6 +48,7 @@ CHROMIUM_DISABLE_ROUTES=false
 LIBREOFFICE_DISABLES_ROUTES=false
 LOG_LEVEL=info
 LOG_FORMAT=auto
+LOG_FIELDS_PREFIX=
 PDFENGINES_ENGINES=
 PDFENGINES_DISABLE_ROUTES=false
 PROMETHEUS_NAMESPACE=gotenberg
@@ -78,6 +80,7 @@ run: ## Start a Gotenberg container
 	--api-root-path=$(API_ROOT_PATH) \
 	--api-trace-header=$(API_TRACE_HEADER) \
 	--api-disable-health-check-logging=$(API_DISABLE_HEALTH_CHECK_LOGGING) \
+	--chromium-failed-starts-threshold=$(CHROMIUM_FAILED_STARTS_THRESHOLD) \
 	--chromium-incognito=$(CHROMIUM_INCOGNITO) \
 	--chromium-allow-insecure-localhost=$(CHROMIUM_ALLOW_INSECURE_LOCALHOST) \
 	--chromium-ignore-certificate-errors=$(CHROMIUM_IGNORE_CERTIFICATE_ERRORS) \
@@ -92,6 +95,7 @@ run: ## Start a Gotenberg container
 	--libreoffice-disable-routes=$(LIBREOFFICE_DISABLES_ROUTES) \
 	--log-level=$(LOG_LEVEL) \
 	--log-format=$(LOG_FORMAT) \
+	--log-fields-prefix=$(LOG_FIELDS_PREFIX) \
 	--pdfengines-engines=$(PDFENGINES_ENGINES) \
 	--pdfengines-disable-routes=$(PDFENGINES_DISABLE_ROUTES) \
 	--prometheus-namespace=$(PROMETHEUS_NAMESPACE) \

SECURITY.md

@@ -0,0 +1,41 @@
+# Security Policy
+
+## Supported Versions
+
+Please ensure to keep your environment up-to-date and use only the latest version of Gotenberg. 
+Security updates and patches will be applied only to the most recent version.
+
+## Reporting a Vulnerability
+
+Your help in identifying vulnerabilities in our project is much appreciated. 
+We take all reports regarding security seriously.
+
+If you discover a security vulnerability, please refrain from publishing it publicly. 
+Instead, kindly send us the details via email to *neuhart [dot] julien [at] gmail [dot] com*.
+
+In the subject of your email, please indicate that it's a security vulnerability report for Gotenberg. 
+In your message, please include:
+
+* A detailed description of the vulnerability.
+* The steps to reproduce the issue.
+* Any potential impact of the vulnerability on the users or system.
+
+Please remember that this process is done in a *'best-effort'* manner. 
+This means we strive to respond and act as quickly as possible, but the speed may vary depending on the severity of
+the issue and our resources.
+
+Thank you in advance for helping to keep our project safe!
+
+## Disclosure Policy
+
+Once we have received your vulnerability report, we will work to validate and reproduce the issue. 
+If we can confirm the vulnerability, we will proceed to:
+
+* Work on a fix and a release timeline.
+* Notify you when the fix has been implemented and released.
+* Credit you for discovering the vulnerability (unless you request anonymity).
+* Please note that we will do our best to keep you informed about the progress towards resolving the issue.
+
+## Comments on this Policy
+
+If you have suggestions on how this process could be improved, please submit a pull request.

build/Dockerfile

@@ -1,11 +1,15 @@
-# Note: ARG instructions do not create additional layers.
-# Instead, next layers will concatenate them.
+# ARG instructions do not create additional layers. Instead, next layers will
+# concatenate them. Also, we have to repeat ARG instructions in each build
+# stage that uses them.
 ARG GOLANG_VERSION
-# Note: we have to repeat ARG instructions in each build stage that uses them.
 ARG GOTENBERG_VERSION
 
-FROM golang:$GOLANG_VERSION AS builder
+# ----------------------------------------------
+# Gotenberg binary build stage
+# ----------------------------------------------
+FROM golang:$GOLANG_VERSION AS binary-stage
 
+ARG GOTENBERG_VERSION
 ENV CGO_ENABLED 0
 
 # Define the working directory outside of $GOPATH (we're using go modules).
@@ -21,14 +25,18 @@ RUN go mod download &&\
 COPY cmd ./cmd
 COPY pkg ./pkg
 
-# Build the binary.
-ARG GOTENBERG_VERSION
-
 RUN go build -o gotenberg -ldflags "-X 'github.com/gotenberg/gotenberg/v7/cmd.Version=$GOTENBERG_VERSION'" cmd/gotenberg/main.go
 
+# ----------------------------------------------
+# Final stage
+# ----------------------------------------------
 FROM debian:11-slim
 
 ARG GOTENBERG_VERSION
+ARG GOTENBERG_USER_GID
+ARG GOTENBERG_USER_UID
+ARG NOTO_COLOR_EMOJI_VERSION
+ARG PDFTK_VERSION
 
 LABEL author="Julien Neuhart" \
       description="A Docker-powered stateless API for PDF files." \
@@ -36,43 +44,33 @@ LABEL author="Julien Neuhart" \
       version="$GOTENBERG_VERSION" \
       website="https://gotenberg.dev"
 
-# Improve fonts subpixel hinting and smoothing.
-# Credits:
-# https://github.com/arachnys/athenapdf/issues/69.
-# https://github.com/arachnys/athenapdf/commit/ba25a8d80a25d08d58865519c4cd8756dc9a336d.
-COPY build/fonts.conf /etc/fonts/conf.d/100-gotenberg.conf
-
-# Simple wrapper around Java and PDFtk.
-COPY build/pdftk.sh /usr/bin/pdftk
-
-# Setup the Docker image.
-ARG GOTENBERG_USER_GID
-ARG GOTENBERG_USER_UID
-ARG NOTO_COLOR_EMOJI_VERSION
-ARG PDFTK_VERSION
-
-# Script for installing either Google Chrome stable on amd64 architecture or
-# Chromium on other architectures.
-# See https://github.com/gotenberg/gotenberg/issues/328.
-COPY build/install-chromium.sh /tmp/install-chromium.sh
-
 RUN \
     # Create a non-root user.
     # All processes in the Docker container will run with this dedicated user.
     groupadd --gid "$GOTENBERG_USER_GID" gotenberg &&\
     useradd --uid "$GOTENBERG_USER_UID" --gid gotenberg --shell /bin/bash --home /home/gotenberg --no-create-home gotenberg &&\
     mkdir /home/gotenberg &&\
-    chown gotenberg: /home/gotenberg &&\
-    # Install dependencies required for the next instructions or debugging.
+    chown gotenberg: /home/gotenberg
+
+RUN \
+    # Install system dependencies required for the next instructions or debugging.
     # Note: tini is a helper for reaping zombie processes.
     apt-get update -qq &&\
     DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends curl gnupg htop tini python3 default-jre-headless &&\
     ln -s /usr/bin/htop /usr/bin/top &&\
+    # Cleanup.
+    # Note: the Debian image does automatically a clean after each install thanks to a hook.
+    # Therefore, there is no need for apt-get clean.
+    # See https://stackoverflow.com/a/24417119/3248473.
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN \
     # Install fonts.
     # Credits:
     # https://github.com/arachnys/athenapdf/blob/master/cli/Dockerfile.
     # https://help.accusoft.com/PrizmDoc/v12.1/HTML/Installing_Asian_Fonts_on_Ubuntu_and_Debian.html.
     curl -o ./ttf-mscorefonts-installer_3.8_all.deb http://httpredir.debian.org/debian/pool/contrib/m/msttcorefonts/ttf-mscorefonts-installer_3.8_all.deb &&\
+    apt-get update -qq &&\
     DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends \
     ./ttf-mscorefonts-installer_3.8_all.deb \
     culmus \
@@ -115,53 +113,69 @@ RUN \
     # https://github.com/gotenberg/gotenberg/pull/325.
     # https://github.com/googlefonts/noto-emoji.
     curl -Ls "https://github.com/googlefonts/noto-emoji/raw/$NOTO_COLOR_EMOJI_VERSION/fonts/NotoColorEmoji.ttf" -o /usr/local/share/fonts/NotoColorEmoji.ttf &&\
-    # Install Google Chrome / Chromium.
-    /tmp/install-chromium.sh &&\
-    # Install LibreOffice.
+    # Cleanup.
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN \
+    # Install either Google Chrome stable on amd64 architecture or
+    # Chromium on other architectures.
+    # See https://github.com/gotenberg/gotenberg/issues/328.
+    /bin/bash -c \
+    'set -e &&\
+    if [[ "$(dpkg --print-architecture)" == "amd64" ]]; then \
+      curl https://dl.google.com/linux/linux_signing_key.pub | apt-key add - &&\
+      echo "deb http://dl.google.com/linux/chrome/deb/ stable main" | tee /etc/apt/sources.list.d/google-chrome.list &&\
+      apt-get update -qq &&\
+      DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends --allow-unauthenticated google-chrome-stable &&\
+      mv /usr/bin/google-chrome-stable /usr/bin/chromium; \
+    else \
+      apt-get update -qq &&\
+      DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends chromium; \
+    fi' &&\
+    # Verify installation.
+    chromium --version &&\
+    # Cleanup.
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN \
+    # Install LibreOffice & unoconv.
+    apt-get update -qq &&\
     DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends libreoffice &&\
-    # Next lines are not currently relevant, as latest versions of LibreOffice
-    # (i.e., > 7.0.4) are causing troubles.
-    # See:
-    # https://packages.debian.org/search?keywords=libreoffice.
-    # https://github.com/gotenberg/gotenberg/issues/442.
-    # https://github.com/gotenberg/gotenberg/issues/516.
-    # https://github.com/gotenberg/gotenberg/issues/529.
-    # https://github.com/gotenberg/gotenberg/issues/537.
-    # https://github.com/gotenberg/gotenberg/issues/568.
-        # Note: we use the bullseye-backports distribution to get the latest LibreOffice version.
-        # See:
-        # https://github.com/gotenberg/gotenberg/pull/322.
-        # https://github.com/gotenberg/gotenberg/issues/403.
-        #echo "deb https://httpredir.debian.org/debian/ bullseye-backports main contrib non-free" >> /etc/apt/sources.list &&\
-        #apt-get update -qq &&\
-        #DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends -t bullseye-backports libreoffice &&\
-    # Download unoconv (Python script).
     curl -Ls https://raw.githubusercontent.com/dagwieers/unoconv/master/unoconv -o /usr/bin/unoconv &&\
     chmod +x /usr/bin/unoconv &&\
     # unoconv will look for the Python binary, which has to be at version 3.
     ln -s /usr/bin/python3 /usr/bin/python &&\
-    # Download PDFtk.
-    # See https://github.com/gotenberg/gotenberg/pull/273. \
+    # Verify installations.
+    libreoffice --version &&\
+    unoconv --version &&\
+    # Cleanup.
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+RUN \
+    # Install PDFtk & QPDF (PDF engines).
+    # See https://github.com/gotenberg/gotenberg/pull/273.
     curl -o /usr/bin/pdftk-all.jar "https://gitlab.com/api/v4/projects/5024297/packages/generic/pdftk-java/$PDFTK_VERSION/pdftk-all.jar" &&\
     chmod a+x /usr/bin/pdftk-all.jar &&\
-    # Download QPDF.
+    echo '#!/bin/bash\n\nexec java -jar /usr/bin/pdftk-all.jar "$@"' > /usr/bin/pdftk && \
+    chmod +x /usr/bin/pdftk &&\
+    apt-get update -qq &&\
     DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends qpdf &&\
     # See https://github.com/nextcloud/docker/issues/380.
     mkdir -p /usr/share/man/man1 &&\
-    # Cleanup.
-    # Note: the Debian image does automatically a clean after each install thanks to a hook.
-    # Therefore, there is no need for apt-get clean.
-    # See https://stackoverflow.com/a/24417119/3248473.
-    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* &&\
-    # Print versions of main dependencies.
-    chromium --version &&\
-    libreoffice --version &&\
-    unoconv --version &&\
+    # Verify installations.
     pdftk --version &&\
-    qpdf --version
+    qpdf --version &&\
+    # Cleanup.
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Improve fonts subpixel hinting and smoothing.
+# Credits:
+# https://github.com/arachnys/athenapdf/issues/69.
+# https://github.com/arachnys/athenapdf/commit/ba25a8d80a25d08d58865519c4cd8756dc9a336d.
+COPY build/fonts.conf /etc/fonts/conf.d/100-gotenberg.conf
 
 # Copy the Gotenberg binary from the builder stage.
-COPY --from=builder /home/gotenberg /usr/bin/
+COPY --from=binary-stage /home/gotenberg /usr/bin/
 
 # Environment variables required by modules or else.
 ENV GC_EXCLUDE_SUBSTR "hsperfdata_root,hsperfdata_gotenberg"

build/Dockerfile.cloudrun

@@ -1,5 +1,3 @@
-# Note: ARG instructions do not create additional layers.
-# Instead, next layers will concatenate them.
 ARG DOCKER_REPOSITORY
 ARG GOTENBERG_VERSION
 

build/install-chromium.sh

@@ -1,15 +0,0 @@
-#!/bin/bash
-
-set -e
-
-ARCH=$(dpkg --print-architecture)
-
-if [[ "$ARCH" == "amd64" ]]; then
-  curl https://dl.google.com/linux/linux_signing_key.pub | apt-key add -
-  echo "deb http://dl.google.com/linux/chrome/deb/ stable main" | tee /etc/apt/sources.list.d/google-chrome.list
-  apt-get update -qq
-  DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends --allow-unauthenticated google-chrome-stable
-  mv /usr/bin/google-chrome-stable /usr/bin/chromium
-else
-  DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends chromium
-fi

build/pdftk.sh

@@ -1,3 +0,0 @@
-#!/bin/bash
-
-exec java -jar /usr/bin/pdftk-all.jar "$@"

cmd/gotenberg.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"os"
 	"os/signal"
+	"syscall"
 	"time"
 
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
@@ -109,8 +110,8 @@ func Run() {
 
 	quit := make(chan os.Signal, 1)
 
-	// We'll accept graceful shutdowns when quit via SIGINT (Ctrl+C).
-	signal.Notify(quit, os.Interrupt)
+	// We'll accept graceful shutdowns when quit via SIGINT (Ctrl+C) or SIGTERM (Kubernetes).
+	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
 
 	// Block until we receive our signal.
 	<-quit
@@ -119,7 +120,7 @@ func Run() {
 	defer cancel()
 
 	forceQuit := make(chan os.Signal, 1)
-	signal.Notify(forceQuit, os.Interrupt)
+	signal.Notify(forceQuit, syscall.SIGINT)
 
 	go func() {
 		// In case of force quit, cancel the context.

docs/openapi.yaml

@@ -79,6 +79,8 @@ paths:
           $ref: '#/components/responses/SuccessfulPDF'
         '400':
           description: Bad Request
+        '503':
+          $ref: '#/components/responses/Timeout'
 
   /forms/chromium/convert/html:
     post:
@@ -128,6 +130,8 @@ paths:
           $ref: '#/components/responses/SuccessfulPDF'
         '400':
           description: Bad Request
+        '503':
+          $ref: '#/components/responses/Timeout'
 
   /forms/chromium/convert/markdown:
     post:
@@ -181,6 +185,8 @@ paths:
           $ref: '#/components/responses/SuccessfulPDF'
         '400':
           description: Bad Request
+        '503':
+          $ref: '#/components/responses/Timeout'
 
   /forms/libreoffice/convert:
     post:
@@ -244,6 +250,8 @@ paths:
           $ref: '#/components/responses/SuccessfulPDF'
         '400':
           description: Bad Request, e.g. Both 'pdfFormat' and 'nativePdfA1aFormat' form values are provided
+        '503':
+          $ref: '#/components/responses/Timeout'
 
   /forms/pdfengines/merge:
     post:
@@ -300,6 +308,8 @@ paths:
           $ref: '#/components/responses/SuccessfulPDF'
         '400':
           description: Bad Request
+        '503':
+          $ref: '#/components/responses/Timeout'
 
   /forms/pdfengines/convert:
     post:
@@ -355,6 +365,8 @@ paths:
         '400':
           description: >-
             Bad Request, e.g. Invalid form data: no form file found for extensions: [.pdf]; form value 'pdfFormat' is required
+        '503':
+          $ref: '#/components/responses/Timeout'
 
 components:
   schemas:
@@ -727,4 +739,6 @@ components:
         application/pdf:
           schema:
             type: string
-            format: binary
+            format: binary
+    Timeout:
+      description: Service Unavailable

go.mod

@@ -3,38 +3,38 @@ module github.com/gotenberg/gotenberg/v7
 go 1.20
 
 require (
-	github.com/alexliesenfeld/health v0.6.0
+	github.com/alexliesenfeld/health v0.7.0
 	github.com/andybalholm/brotli v1.0.5 // indirect
-	github.com/chromedp/cdproto v0.0.0-20230220211738-2b1ec77315c9
-	github.com/chromedp/chromedp v0.8.7
+	github.com/chromedp/cdproto v0.0.0-20230716001748-3ed7c525ec8b
+	github.com/chromedp/chromedp v0.9.1
 	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/uuid v1.3.0
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
-	github.com/hashicorp/go-retryablehttp v0.7.2
-	github.com/klauspost/compress v1.15.15 // indirect
-	github.com/klauspost/pgzip v1.2.5 // indirect
-	github.com/labstack/echo/v4 v4.10.2
+	github.com/hashicorp/go-retryablehttp v0.7.4
+	github.com/klauspost/compress v1.16.7 // indirect
+	github.com/klauspost/pgzip v1.2.6 // indirect
+	github.com/labstack/echo/v4 v4.11.1
 	github.com/labstack/gommon v0.4.0
-	github.com/mattn/go-isatty v0.0.17 // indirect
+	github.com/mattn/go-isatty v0.0.19 // indirect
 	github.com/mholt/archiver/v3 v3.5.1
-	github.com/microcosm-cc/bluemonday v1.0.22
+	github.com/microcosm-cc/bluemonday v1.0.25
 	github.com/nwaples/rardecode v1.1.3 // indirect
-	github.com/pdfcpu/pdfcpu v0.3.13
-	github.com/pierrec/lz4/v4 v4.1.17 // indirect
-	github.com/prometheus/client_golang v1.14.0
+	github.com/pdfcpu/pdfcpu v0.4.1
+	github.com/pierrec/lz4/v4 v4.1.18 // indirect
+	github.com/prometheus/client_golang v1.16.0
 	github.com/russross/blackfriday/v2 v2.1.0
 	github.com/spf13/pflag v1.0.5
 	github.com/ulikunitz/xz v0.5.11 // indirect
-	go.uber.org/atomic v1.10.0 // indirect
-	go.uber.org/multierr v1.9.0
+	go.uber.org/atomic v1.11.0 // indirect
+	go.uber.org/multierr v1.11.0
 	go.uber.org/zap v1.24.0
-	golang.org/x/crypto v0.6.0 // indirect
-	golang.org/x/image v0.5.0 // indirect
-	golang.org/x/net v0.7.0
-	golang.org/x/sync v0.1.0
-	golang.org/x/sys v0.5.0 // indirect
-	golang.org/x/term v0.5.0
-	golang.org/x/text v0.7.0
+	golang.org/x/crypto v0.11.0 // indirect
+	golang.org/x/image v0.9.0 // indirect
+	golang.org/x/net v0.12.0
+	golang.org/x/sync v0.3.0
+	golang.org/x/sys v0.10.0 // indirect
+	golang.org/x/term v0.10.0
+	golang.org/x/text v0.11.0
 )
 
 require (
@@ -45,26 +45,25 @@ require (
 	github.com/dsnet/compress v0.0.2-0.20210315054119-f66993602bf5 // indirect
 	github.com/gobwas/httphead v0.1.0 // indirect
 	github.com/gobwas/pool v0.2.1 // indirect
-	github.com/gobwas/ws v1.1.0 // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/gobwas/ws v1.2.1 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/gorilla/css v1.0.0 // indirect
-	github.com/hhrutter/lzw v0.0.0-20190829144645-6f07a24e8650 // indirect
-	github.com/hhrutter/tiff v0.0.0-20190829141212-736cae8d0bc7 // indirect
+	github.com/hhrutter/lzw v1.0.0 // indirect
+	github.com/hhrutter/tiff v1.0.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
-	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/kr/pretty v0.3.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-runewidth v0.0.14 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/prometheus/client_model v0.3.0 // indirect
-	github.com/prometheus/common v0.40.0 // indirect
-	github.com/prometheus/procfs v0.9.0 // indirect
+	github.com/prometheus/client_model v0.4.0 // indirect
+	github.com/prometheus/common v0.44.0 // indirect
+	github.com/prometheus/procfs v0.11.0 // indirect
+	github.com/rivo/uniseg v0.4.4 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasttemplate v1.2.2 // indirect
 	github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 // indirect
-	google.golang.org/protobuf v1.28.1 // indirect
+	google.golang.org/protobuf v1.31.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )

go.sum

@@ -1,5 +1,5 @@
-github.com/alexliesenfeld/health v0.6.0 h1:HRBTCgybNSe4lqGEk7nU82c3bjwh9W+3b46W6UvD4CQ=
-github.com/alexliesenfeld/health v0.6.0/go.mod h1:N4NDIeQtlWumG+6z1ne1v62eQxktz5ylEgGgH9emdMw=
+github.com/alexliesenfeld/health v0.7.0 h1:U3mSZ3ussRbGx+/rXBjNVxjLX5cKaNh8Ly9Hx3q+yfY=
+github.com/alexliesenfeld/health v0.7.0/go.mod h1:6Nnjbu7vBYHoZqIuZeOnTpnW7OH14ulR+wIBE2QuJ8I=
 github.com/andybalholm/brotli v1.0.1/go.mod h1:loMXtMfwqflxFJPmdbJO0a3KNoPuLBgiu3qAvBg8x/Y=
 github.com/andybalholm/brotli v1.0.5 h1:8uQZIdzKmjc/iuPu7O2ioW48L81FgatrcpfFmiq/cCs=
 github.com/andybalholm/brotli v1.0.5/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
@@ -10,10 +10,11 @@ github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
 github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/chromedp/cdproto v0.0.0-20230220211738-2b1ec77315c9 h1:wMSvdj3BswqfQOXp2R1bJOAE7xIQLt2dlMQDMf836VY=
 github.com/chromedp/cdproto v0.0.0-20230220211738-2b1ec77315c9/go.mod h1:GKljq0VrfU4D5yc+2qA6OVr8pmO/MBbPEWqWQ/oqGEs=
-github.com/chromedp/chromedp v0.8.7 h1:dYOYc5ynTBzwSLOi+1IfgHwPr8r2BqV48l/RC+3OuJ0=
-github.com/chromedp/chromedp v0.8.7/go.mod h1:iL+ywnwk3eG3EVXV1ackXBMNzdEh3Ye/KHvQkq1KRKU=
+github.com/chromedp/cdproto v0.0.0-20230716001748-3ed7c525ec8b h1:4RSQDLMb5m1XmyOgy7iQJmXuVsK24TaBoToW/FIFigA=
+github.com/chromedp/cdproto v0.0.0-20230716001748-3ed7c525ec8b/go.mod h1:GKljq0VrfU4D5yc+2qA6OVr8pmO/MBbPEWqWQ/oqGEs=
+github.com/chromedp/chromedp v0.9.1 h1:CC7cC5p1BeLiiS2gfNNPwp3OaUxtRMBjfiw3E3k6dFA=
+github.com/chromedp/chromedp v0.9.1/go.mod h1:DUgZWRvYoEfgi66CgZ/9Yv+psgi+Sksy5DTScENWjaQ=
 github.com/chromedp/sysutil v1.0.0 h1:+ZxhTpfpZlmchB58ih/LBHX52ky7w2VhQVKQMucy3Ic=
 github.com/chromedp/sysutil v1.0.0/go.mod h1:kgWmDdq8fTzXYcKIBqIYvRRTnYb9aNS9moAV0xufSww=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
@@ -27,19 +28,18 @@ github.com/gobwas/httphead v0.1.0 h1:exrUm0f4YX0L7EBwZHuCF4GDp8aJfVeBrlLQrs6NqWU
 github.com/gobwas/httphead v0.1.0/go.mod h1:O/RXo79gxV8G+RqlR/otEwx4Q36zl9rqC5u12GKvMCM=
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 github.com/gobwas/pool v0.2.1/go.mod h1:q8bcK0KcYlCgd9e7WYLm9LpyS+YeLd8JVDW6WezmKEw=
-github.com/gobwas/ws v1.1.0 h1:7RFti/xnNkMJnrK7D1yQ/iCIB5OrrY/54/H930kIbHA=
 github.com/gobwas/ws v1.1.0/go.mod h1:nzvNcVha5eUziGrbxFCo6qFIojQHjJV5cLYIbezhfL0=
+github.com/gobwas/ws v1.2.1 h1:F2aeBZrm2NDsc7vbovKrWSogd4wvfAxg0FQ89/iqOTk=
+github.com/gobwas/ws v1.2.1/go.mod h1:hRKAFb8wOxFROYNsT1bqfWnhX+b5MFeJM9r2ZSwg/KY=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.5/go.mod h1:6O5/vntMXwX2lRkT1hjjk0nAC1IDOTvTlVgjlRvqsdk=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
-github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/golang/snappy v0.0.2/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
 github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
-github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gorilla/css v1.0.0 h1:BQqNyPTi50JCFMTw/b67hByjMVXZRwGha6wxVGkeihY=
@@ -48,33 +48,31 @@ github.com/hashicorp/go-cleanhttp v0.5.2 h1:035FKYIWjmULyFRBKPs8TBQoi0x6d9G4xc9n
 github.com/hashicorp/go-cleanhttp v0.5.2/go.mod h1:kO/YDlP8L1346E6Sodw+PrpBSV4/SoxCXGY6BqNFT48=
 github.com/hashicorp/go-hclog v0.9.2 h1:CG6TE5H9/JXsFWJCfoIVpKFIkFe6ysEuHirp4DxCsHI=
 github.com/hashicorp/go-hclog v0.9.2/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrjA0H7acj2lQ=
-github.com/hashicorp/go-retryablehttp v0.7.2 h1:AcYqCvkpalPnPF2pn0KamgwamS42TqUDDYFRKq/RAd0=
-github.com/hashicorp/go-retryablehttp v0.7.2/go.mod h1:Jy/gPYAdjqffZ/yFGCFV2doI5wjtH1ewM9u8iYVjtX8=
-github.com/hhrutter/lzw v0.0.0-20190827003112-58b82c5a41cc/go.mod h1:yJBvOcu1wLQ9q9XZmfiPfur+3dQJuIhYQsMGLYcItZk=
-github.com/hhrutter/lzw v0.0.0-20190829144645-6f07a24e8650 h1:1yY/RQWNSBjJe2GDCIYoLmpWVidrooriUr4QS/zaATQ=
-github.com/hhrutter/lzw v0.0.0-20190829144645-6f07a24e8650/go.mod h1:yJBvOcu1wLQ9q9XZmfiPfur+3dQJuIhYQsMGLYcItZk=
-github.com/hhrutter/tiff v0.0.0-20190829141212-736cae8d0bc7 h1:o1wMw7uTNyA58IlEdDpxIrtFHTgnvYzA8sCQz8luv94=
-github.com/hhrutter/tiff v0.0.0-20190829141212-736cae8d0bc7/go.mod h1:WkUxfS2JUu3qPo6tRld7ISb8HiC0gVSU91kooBMDVok=
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-github.com/klauspost/compress v1.15.15 h1:EF27CXIuDsYJ6mmvtBRlEuB2UVOqHG1tAXgZ7yIO+lw=
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-github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
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@@ -82,53 +80,56 @@ github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxec
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@@ -141,31 +142,33 @@ github.com/valyala/fasttemplate v1.2.2/go.mod h1:KHLXt3tVN2HBp8eijSv/kGJopbvo7S+
 github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 h1:nIPpBwaJSVYIxUFsDv3M8ofmx9yWTog9BfvIu0q41lo=
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@@ -176,26 +179,31 @@ golang.org/x/sys v0.0.0-20211103235746-7861aae1554b/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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+golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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-google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
-google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
+google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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@@ -203,3 +211,4 @@ gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

pkg/gotenberg/logging.go

@@ -2,8 +2,8 @@ package gotenberg
 
 import "go.uber.org/zap"
 
-// LoggerProvider is a module interface which exposes a method for creating a
-// zap.Logger for other modules.
+// LoggerProvider is an interface for a module that supplies a method for
+// creating a zap.Logger instance for use by other modules.
 //
 //	func (m *YourModule) Provision(ctx *gotenberg.Context) error {
 //		provider, _ := ctx.Module(new(gotenberg.LoggerProvider))

pkg/modules/chromium/chromium.go

@@ -11,6 +11,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/alexliesenfeld/health"
 	"github.com/chromedp/cdproto/cdp"
 	"github.com/chromedp/cdproto/emulation"
 	"github.com/chromedp/cdproto/fetch"
@@ -69,6 +70,7 @@ var (
 type Chromium struct {
 	binPath                  string
 	engine                   gotenberg.PDFEngine
+	failedStartsThreshold    int
 	userAgent                string
 	incognito                bool
 	allowInsecureLocalhost   bool
@@ -261,6 +263,7 @@ func (mod Chromium) Descriptor() gotenberg.ModuleDescriptor {
 		ID: "chromium",
 		FlagSet: func() *flag.FlagSet {
 			fs := flag.NewFlagSet("chromium", flag.ExitOnError)
+			fs.Int("chromium-failed-starts-threshold", 5, "Set the number of consecutive failed starts after which the module is considered unhealthy - 0 means ignore")
 			fs.String("chromium-user-agent", "", "Override the default User-Agent header")
 			fs.Bool("chromium-incognito", false, "Start Chromium with incognito mode")
 			fs.Bool("chromium-allow-insecure-localhost", false, "Ignore TLS/SSL errors on localhost")
@@ -288,6 +291,7 @@ func (mod Chromium) Descriptor() gotenberg.ModuleDescriptor {
 // Provision sets the module properties.
 func (mod *Chromium) Provision(ctx *gotenberg.Context) error {
 	flags := ctx.ParsedFlags()
+	mod.failedStartsThreshold = flags.MustInt("chromium-failed-starts-threshold")
 	mod.userAgent = flags.MustString("chromium-user-agent")
 	mod.allowInsecureLocalhost = flags.MustBool("chromium-allow-insecure-localhost")
 	mod.ignoreCertificateErrors = flags.MustBool("chromium-ignore-certificate-errors")
@@ -345,6 +349,41 @@ func (mod Chromium) Metrics() ([]gotenberg.Metric, error) {
 				return activeInstancesCount
 			},
 		},
+		{
+			Name:        "chromium_failed_starts_count",
+			Description: "Current number of Chromium consecutive starting failures.",
+			Read: func() float64 {
+				failedStartsCountMu.RLock()
+				defer failedStartsCountMu.RUnlock()
+
+				return failedStartsCount
+			},
+		},
+	}, nil
+}
+
+// Checks adds a health check that verifies if Chromium consecutive failed
+// starts threshold has been reached or not.
+// See https://github.com/gotenberg/gotenberg/issues/633.
+func (mod Chromium) Checks() ([]health.CheckerOption, error) {
+	if mod.failedStartsThreshold == 0 {
+		return nil, nil
+	}
+
+	return []health.CheckerOption{
+		health.WithCheck(health.Check{
+			Name: "chromium",
+			Check: func(_ context.Context) error {
+				failedStartsCountMu.RLock()
+				defer failedStartsCountMu.RUnlock()
+
+				if int(failedStartsCount) < mod.failedStartsThreshold {
+					return nil
+				}
+
+				return errors.New("failed starts threshold reached")
+			},
+		}),
 	}, nil
 }
 
@@ -906,9 +945,21 @@ func (mod Chromium) PDF(ctx context.Context, logger *zap.Logger, URL, outputPath
 			return ErrRpccMessageTooLarge
 		}
 
+		// See https://github.com/gotenberg/gotenberg/issues/633.
+		if strings.Contains(errMessage, "chrome failed to start") {
+			failedStartsCountMu.Lock()
+			failedStartsCount += 1
+			failedStartsCountMu.Unlock()
+		}
+
 		return fmt.Errorf("chromium PDF: %w", err)
 	}
 
+	// See https://github.com/gotenberg/gotenberg/issues/633.
+	failedStartsCountMu.Lock()
+	failedStartsCount = 0
+	failedStartsCountMu.Unlock()
+
 	// See https://github.com/gotenberg/gotenberg/issues/262.
 	consoleExceptionsMu.RLock()
 	defer consoleExceptionsMu.RUnlock()
@@ -923,6 +974,8 @@ func (mod Chromium) PDF(ctx context.Context, logger *zap.Logger, URL, outputPath
 var (
 	activeInstancesCount   float64
 	activeInstancesCountMu sync.RWMutex
+	failedStartsCount      float64
+	failedStartsCountMu    sync.RWMutex
 )
 
 // Interface guards.
@@ -931,6 +984,7 @@ var (
 	_ gotenberg.Provisioner     = (*Chromium)(nil)
 	_ gotenberg.Validator       = (*Chromium)(nil)
 	_ gotenberg.MetricsProvider = (*Chromium)(nil)
+	_ api.HealthChecker         = (*Chromium)(nil)
 	_ api.Router                = (*Chromium)(nil)
 	_ API                       = (*Chromium)(nil)
 	_ Provider                  = (*Chromium)(nil)

pkg/modules/chromium/chromium_test.go

@@ -9,6 +9,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/alexliesenfeld/health"
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
 	"go.uber.org/zap"
 )
@@ -178,14 +179,88 @@ func TestChromium_Metrics(t *testing.T) {
 		t.Fatalf("expected no error but got: %v", err)
 	}
 
-	if len(metrics) != 1 {
-		t.Fatalf("expected %d metrics, but got %d", 1, len(metrics))
+	if len(metrics) != 2 {
+		t.Fatalf("expected %d metrics, but got %d", 2, len(metrics))
 	}
 
 	actual := metrics[0].Read()
 	if actual != 0 {
 		t.Errorf("expected %d Chromium instances, but got %f", 0, actual)
 	}
+
+	actual = metrics[1].Read()
+	if actual != 0 {
+		t.Errorf("expected %d Chromium failed starts, but got %f", 0, actual)
+	}
+}
+
+func TestChromium_Checks(t *testing.T) {
+	tests := []struct {
+		name                     string
+		mod                      Chromium
+		tearUp                   func()
+		tearDown                 func()
+		expectAvailabilityStatus health.AvailabilityStatus
+	}{
+		{
+			name: "ignore Chromium failed starts",
+			mod: Chromium{
+				failedStartsThreshold: 0,
+			},
+		},
+		{
+			name: "with Chromium failed starts threshold not reached",
+			mod: Chromium{
+				failedStartsThreshold: 1,
+			},
+			expectAvailabilityStatus: health.StatusUp,
+		},
+		{
+			name: "with Chromium failed starts threshold reached",
+			mod: Chromium{
+				failedStartsThreshold: 1,
+			},
+			tearUp: func() {
+				failedStartsCount = 1
+			},
+			tearDown: func() {
+				failedStartsCount = 0
+			},
+			expectAvailabilityStatus: health.StatusDown,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if tc.tearUp != nil {
+				tc.tearUp()
+			}
+
+			checks, err := tc.mod.Checks()
+			if err != nil {
+				t.Fatalf("expected no error from mod.Checks(), but got: %v", err)
+			}
+
+			if len(checks) == 0 {
+				return
+			}
+
+			if len(checks) != 1 {
+				t.Fatalf("expected 1 check from mod.Checks(), but got %d", len(checks))
+			}
+
+			checker := health.NewChecker(checks...)
+			result := checker.Check(context.Background())
+
+			if result.Status != tc.expectAvailabilityStatus {
+				t.Errorf("expected '%s' as availability status, but got '%s'", tc.expectAvailabilityStatus, result.Status)
+			}
+
+			if tc.tearDown != nil {
+				tc.tearDown()
+			}
+		})
+	}
 }
 
 func TestChromium_Chromium(t *testing.T) {

pkg/modules/libreoffice/uno/uno_test.go

@@ -196,7 +196,12 @@ func TestUNO_Validate(t *testing.T) {
 }
 
 func TestUNO_Start(t *testing.T) {
+	mod := new(UNO)
 
+	err := mod.Start()
+	if err != nil {
+		t.Errorf("expected no error but got: %v", err)
+	}
 }
 
 func TestUNO_StartupMessage(t *testing.T) {

pkg/modules/logging/logging.go

@@ -32,8 +32,9 @@ const (
 
 // Logging is a module which implements the gotenberg.LoggerProvider interface.
 type Logging struct {
-	level  string
-	format string
+	level        string
+	format       string
+	fieldsPrefix string
 }
 
 // Descriptor returns a Logging's module descriptor.
@@ -42,8 +43,9 @@ func (Logging) Descriptor() gotenberg.ModuleDescriptor {
 		ID: "logging",
 		FlagSet: func() *flag.FlagSet {
 			fs := flag.NewFlagSet("logging", flag.ExitOnError)
-			fs.String("log-level", infoLoggingLevel, fmt.Sprintf("Set the log level - %s, %s, %s, or %s", errorLoggingLevel, warnLoggingLevel, infoLoggingLevel, debugLoggingLevel))
-			fs.String("log-format", autoLoggingFormat, fmt.Sprintf("Set log format - %s, %s, or %s", autoLoggingFormat, jsonLoggingFormat, textLoggingFormat))
+			fs.String("log-level", infoLoggingLevel, fmt.Sprintf("Choose the level of logging detail. Options include %s, %s, %s, or %s", errorLoggingLevel, warnLoggingLevel, infoLoggingLevel, debugLoggingLevel))
+			fs.String("log-format", autoLoggingFormat, fmt.Sprintf("Specify the format of logging. Options include %s, %s, or %s", autoLoggingFormat, jsonLoggingFormat, textLoggingFormat))
+			fs.String("log-fields-prefix", "", "Prepend a specified prefix to each field in the logs")
 
 			return fs
 		}(),
@@ -57,6 +59,7 @@ func (log *Logging) Provision(ctx *gotenberg.Context) error {
 
 	log.level = flags.MustString("log-level")
 	log.format = flags.MustString("log-format")
+	log.fieldsPrefix = flags.MustString("log-fields-prefix")
 
 	return nil
 }
@@ -101,29 +104,64 @@ func (log Logging) Logger(mod gotenberg.Module) (*zap.Logger, error) {
 			return nil, fmt.Errorf("get log encoder: %w", err)
 		}
 
-		core := zapcore.NewCore(encoder, os.Stderr, lvl)
-		logger = zap.New(core)
-
-		// nolint
-		defer logger.Sync()
+		logger = zap.New(customCore{
+			Core:         zapcore.NewCore(encoder, os.Stderr, lvl),
+			fieldsPrefix: log.fieldsPrefix,
+		})
 	}
 
 	return logger.Named(mod.Descriptor().ID), nil
 }
 
-func newLogLevel(level string) (zapcore.Level, error) {
-	switch level {
-	case errorLoggingLevel:
-		return zap.ErrorLevel, nil
-	case warnLoggingLevel:
-		return zap.WarnLevel, nil
-	case infoLoggingLevel:
-		return zap.InfoLevel, nil
-	case debugLoggingLevel:
-		return zap.DebugLevel, nil
-	default:
-		return -2, fmt.Errorf("%s is not a recognized log level", level)
+// See https://github.com/gotenberg/gotenberg/issues/659.
+type customCore struct {
+	zapcore.Core
+	fieldsPrefix string
+}
+
+func (c customCore) With(fields []zapcore.Field) zapcore.Core {
+	if c.fieldsPrefix != "" {
+		for i := range fields {
+			fields[i].Key = c.fieldsPrefix + "_" + fields[i].Key
+		}
 	}
+
+	return customCore{
+		Core:         c.Core.With(fields),
+		fieldsPrefix: c.fieldsPrefix,
+	}
+}
+
+func (c customCore) Check(ent zapcore.Entry, ce *zapcore.CheckedEntry) *zapcore.CheckedEntry {
+	// This is a copy from the zapcore.ioCore implementation. Indeed, by doing
+	// so, we are able to prefix the fields given to the logger methods like
+	// Debug, Info, Warn, Error, etc.
+	if c.Enabled(ent.Level) {
+		return ce.AddCore(ent, c)
+	}
+
+	return ce
+}
+
+func (c customCore) Write(entry zapcore.Entry, fields []zapcore.Field) error {
+	if c.fieldsPrefix != "" {
+		for i := range fields {
+			fields[i].Key = c.fieldsPrefix + "_" + fields[i].Key
+		}
+	}
+
+	return c.Core.Write(entry, fields)
+}
+
+func newLogLevel(level string) (zapcore.Level, error) {
+	lvl := zapcore.InvalidLevel
+
+	err := lvl.UnmarshalText([]byte(level))
+	if err != nil {
+		return lvl, fmt.Errorf("%q is not a recognized log level: %w", level, err)
+	}
+
+	return lvl, nil
 }
 
 func newLogEncoder(format string) (zapcore.Encoder, error) {
@@ -158,6 +196,7 @@ func newLogEncoder(format string) (zapcore.Encoder, error) {
 	}
 }
 
+// Singleton so that we instantiate our logger only once.
 var logger *zap.Logger = nil
 
 // Interface guards.
@@ -166,4 +205,5 @@ var (
 	_ gotenberg.Provisioner    = (*Logging)(nil)
 	_ gotenberg.Validator      = (*Logging)(nil)
 	_ gotenberg.LoggerProvider = (*Logging)(nil)
+	_ zapcore.Core             = (*customCore)(nil)
 )

pkg/modules/logging/logging_test.go

@@ -1,24 +1,18 @@
 package logging
 
 import (
+	"fmt"
 	"reflect"
 	"testing"
 
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
+	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
+	"go.uber.org/zap/zaptest/observer"
 )
 
-type ProtoModule struct {
-	descriptor func() gotenberg.ModuleDescriptor
-}
-
-func (mod ProtoModule) Descriptor() gotenberg.ModuleDescriptor {
-	return mod.descriptor()
-}
-
 func TestLogging_Descriptor(t *testing.T) {
 	descriptor := Logging{}.Descriptor()
-
 	actual := reflect.TypeOf(descriptor.New())
 	expect := reflect.TypeOf(new(Logging))
 
@@ -28,155 +22,302 @@ func TestLogging_Descriptor(t *testing.T) {
 }
 
 func TestLogging_Provision(t *testing.T) {
-	logging := new(Logging)
-	fs := logging.Descriptor().FlagSet
+	for _, tc := range []struct {
+		scenario           string
+		level              string
+		format             string
+		fieldsPrefix       string
+		expectLevel        string
+		expectFormat       string
+		expectFieldsPrefix string
+	}{
+		{
+			scenario:           "default values",
+			expectLevel:        infoLoggingLevel,
+			expectFormat:       autoLoggingFormat,
+			expectFieldsPrefix: "",
+		},
+		{
+			scenario:           "explicit values",
+			level:              "debug",
+			format:             "json",
+			fieldsPrefix:       "gotenberg",
+			expectLevel:        debugLoggingLevel,
+			expectFormat:       jsonLoggingFormat,
+			expectFieldsPrefix: "gotenberg",
+		},
+		{
+			scenario:           "wrong values", // no validation at this point.
+			level:              "foo",
+			format:             "foo",
+			expectLevel:        "foo",
+			expectFormat:       "foo",
+			expectFieldsPrefix: "",
+		},
+	} {
+		var flags []string
 
-	err := fs.Parse([]string{""})
-	if err != nil {
-		t.Fatalf("expected no error but got: %v", err)
-	}
+		if tc.level != "" {
+			flags = append(flags, "--log-level", tc.level)
+		}
 
-	ctx := gotenberg.NewContext(gotenberg.ParsedFlags{FlagSet: fs}, nil)
+		if tc.format != "" {
+			flags = append(flags, "--log-format", tc.format)
+		}
 
-	err = logging.Provision(ctx)
-	if err != nil {
-		t.Errorf("expected no error but got: %v", err)
+		if tc.fieldsPrefix != "" {
+			flags = append(flags, "--log-fields-prefix", tc.fieldsPrefix)
+		}
+
+		logging := new(Logging)
+		fs := logging.Descriptor().FlagSet
+
+		err := fs.Parse(flags)
+		if err != nil {
+			t.Fatalf("%s: expected no error but got: %v", tc.scenario, err)
+		}
+
+		ctx := gotenberg.NewContext(gotenberg.ParsedFlags{FlagSet: fs}, nil)
+
+		err = logging.Provision(ctx)
+		if err != nil {
+			t.Fatalf("%s: expected no error but got: %v", tc.scenario, err)
+		}
+
+		if logging.level != tc.expectLevel {
+			t.Errorf("%s: expected '%s' but got '%s'", tc.scenario, tc.expectLevel, logging.level)
+		}
+
+		if logging.format != tc.expectFormat {
+			t.Errorf("%s: expected '%s' but got '%s'", tc.scenario, tc.expectFormat, logging.format)
+		}
+
+		if logging.fieldsPrefix != tc.expectFieldsPrefix {
+			t.Errorf("%s: expected '%s' but got '%s'", tc.scenario, tc.expectFieldsPrefix, logging.fieldsPrefix)
+		}
 	}
 }
 
 func TestLogging_Validate(t *testing.T) {
-	for i, tc := range []struct {
-		level, format string
-		expectErr     bool
+	for _, tc := range []struct {
+		scenario  string
+		level     string
+		format    string
+		expectErr bool
 	}{
 		{
+			scenario:  "invalid level",
 			level:     "foo",
 			expectErr: true,
 		},
 		{
+			scenario:  "invalid format",
 			level:     debugLoggingLevel,
 			format:    "foo",
 			expectErr: true,
 		},
 		{
-			level:  debugLoggingLevel,
-			format: autoLoggingFormat,
+			scenario: "valid level and format",
+			level:    debugLoggingLevel,
+			format:   autoLoggingFormat,
 		},
 	} {
-		mod := new(Logging)
-		mod.level = tc.level
-		mod.format = tc.format
+		logging := new(Logging)
+		logging.level = tc.level
+		logging.format = tc.format
 
-		err := mod.Validate()
+		err := logging.Validate()
 
 		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
+			t.Errorf("%s: expected error but got: %v", tc.scenario, err)
 		}
 
 		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
+			t.Errorf("%s: expected no error but got: %v", tc.scenario, err)
 		}
 	}
 }
 
 func TestLogging_Logger(t *testing.T) {
-	for i, tc := range []struct {
-		level, format string
-		expectErr     bool
+	for _, tc := range []struct {
+		scenario     string
+		level        string
+		format       string
+		fieldsPrefix string
+		expectErr    bool
 	}{
 		{
+			scenario:  "invalid level",
 			level:     "foo",
 			expectErr: true,
 		},
 		{
+			scenario:  "invalid format",
 			level:     debugLoggingLevel,
 			format:    "foo",
 			expectErr: true,
 		},
 		{
-			level:  debugLoggingLevel,
-			format: autoLoggingFormat,
+			scenario: "valid level and format",
+			level:    debugLoggingLevel,
+			format:   autoLoggingFormat,
 		},
 	} {
-		mod := new(Logging)
-		mod.level = tc.level
-		mod.format = tc.format
+		logging := new(Logging)
+		logging.level = tc.level
+		logging.format = tc.format
+		logging.fieldsPrefix = tc.fieldsPrefix
 
-		_, err := mod.Logger(ProtoModule{
-			descriptor: func() gotenberg.ModuleDescriptor {
-				return gotenberg.ModuleDescriptor{ID: "foo", New: nil}
+		_, err := logging.Logger(gotenberg.ModuleMock{
+			DescriptorMock: func() gotenberg.ModuleDescriptor {
+				return gotenberg.ModuleDescriptor{ID: "mock", New: nil}
 			},
 		})
 
 		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
+			t.Errorf("%s: expected error but got: %v", tc.scenario, err)
 		}
 
 		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
+			t.Errorf("%s: expected no error but got: %v", tc.scenario, err)
 		}
 	}
 }
 
-func TestNewLogLevel(t *testing.T) {
-	for i, tc := range []struct {
+func TestCustomCore(t *testing.T) {
+	for _, tc := range []struct {
+		scenario     string
+		level        zapcore.Level
+		fieldsPrefix string
+		expectEntry  bool
+	}{
+		{
+			scenario:     "level enabled",
+			level:        zapcore.DebugLevel,
+			fieldsPrefix: "gotenberg",
+			expectEntry:  true,
+		},
+		{
+			scenario:    "no fields prefix",
+			level:       zapcore.DebugLevel,
+			expectEntry: true,
+		},
+		{
+			scenario: "level disabled",
+			level:    zapcore.ErrorLevel,
+		},
+	} {
+		core, obsvr := observer.New(tc.level)
+		lgr := zap.New(customCore{
+			Core:         core,
+			fieldsPrefix: tc.fieldsPrefix,
+		}).With(zap.String("a_field", "a value"))
+
+		lgr.Debug("a debug message", zap.String("another_field", "another value"))
+
+		entries := obsvr.TakeAll()
+
+		if tc.expectEntry && len(entries) == 0 {
+			t.Fatalf("%s: expected an entry", tc.scenario)
+		}
+
+		if !tc.expectEntry && len(entries) != 0 {
+			t.Fatalf("%s: expected no entry", tc.scenario)
+		}
+
+		var prefix string
+		if tc.fieldsPrefix != "" {
+			prefix = tc.fieldsPrefix + "_"
+		}
+
+		for _, entry := range entries {
+			fields := entry.Context
+
+			if len(fields) != 2 {
+				t.Fatalf("expected 2 fields but got %d", len(fields))
+			}
+
+			if fields[0].Key != fmt.Sprintf("%sa_field", prefix) {
+				t.Errorf("expected 'gotenberg_a_field' but got '%s'", fields[0].Key)
+			}
+
+			if fields[1].Key != fmt.Sprintf("%sanother_field", prefix) {
+				t.Errorf("expected 'gotenberg_another_field' but got '%s'", fields[1].Key)
+			}
+		}
+	}
+}
+
+func Test_newLogLevel(t *testing.T) {
+	for _, tc := range []struct {
+		scenario       string
 		level          string
 		expectZapLevel zapcore.Level
 		expectErr      bool
 	}{
 		{
+			scenario:       "error level",
 			level:          errorLoggingLevel,
 			expectZapLevel: zapcore.ErrorLevel,
 		},
 		{
+			scenario:       "warning level",
 			level:          warnLoggingLevel,
 			expectZapLevel: zapcore.WarnLevel,
 		},
 		{
+			scenario:       "info level",
 			level:          infoLoggingLevel,
 			expectZapLevel: zapcore.InfoLevel,
 		},
 		{
+			scenario:       "debug level",
 			level:          debugLoggingLevel,
 			expectZapLevel: zapcore.DebugLevel,
 		},
 		{
+			scenario:       "invalid level",
 			level:          "foo",
-			expectZapLevel: -2,
+			expectZapLevel: zapcore.InvalidLevel,
 			expectErr:      true,
 		},
 	} {
 		actual, err := newLogLevel(tc.level)
 
 		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
+			t.Errorf("%s: expected error but got: %v", tc.scenario, err)
 		}
 
 		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
+			t.Errorf("%s: expected no error but got: %v", tc.scenario, err)
 		}
 
 		if tc.expectZapLevel != actual {
-			t.Errorf("test %d: expected %d level but got %d", i, tc.expectZapLevel, actual)
+			t.Errorf("%s: expected %d level but got %d", tc.scenario, tc.expectZapLevel, actual)
 		}
 	}
 }
 
-func TestNewLogEncoder(t *testing.T) {
-	for i, tc := range []struct {
+func Test_newLogEncoder(t *testing.T) {
+	for _, tc := range []struct {
+		scenario  string
 		format    string
 		expectErr bool
 	}{
 		{
-			format: autoLoggingFormat,
+			scenario: "auto format",
+			format:   autoLoggingFormat,
 		},
 		{
-			format: textLoggingFormat,
+			scenario: "text format",
+			format:   textLoggingFormat,
 		},
 		{
-			format: jsonLoggingFormat,
+			scenario: "json format",
+			format:   jsonLoggingFormat,
 		},
 		{
+			scenario:  "invalid format",
 			format:    "foo",
 			expectErr: true,
 		},
@@ -184,16 +325,11 @@ func TestNewLogEncoder(t *testing.T) {
 		_, err := newLogEncoder(tc.format)
 
 		if tc.expectErr && err == nil {
-			t.Errorf("test %d: expected error but got: %v", i, err)
+			t.Errorf("%s: expected error but got: %v", tc.scenario, err)
 		}
 
 		if !tc.expectErr && err != nil {
-			t.Errorf("test %d: expected no error but got: %v", i, err)
+			t.Errorf("%s: expected no error but got: %v", tc.scenario, err)
 		}
 	}
 }
-
-// Interface guards.
-var (
-	_ gotenberg.Module = (*ProtoModule)(nil)
-)

pkg/modules/pdfcpu/pdfcpu.go

@@ -7,7 +7,7 @@ import (
 	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
 	pdfcpuAPI "github.com/pdfcpu/pdfcpu/pkg/api"
 	pdfcpuLog "github.com/pdfcpu/pdfcpu/pkg/log"
-	pdfcpuConfig "github.com/pdfcpu/pdfcpu/pkg/pdfcpu"
+	pdfcpuConfig "github.com/pdfcpu/pdfcpu/pkg/pdfcpu/model"
 	"go.uber.org/zap"
 )
 

test/Dockerfile

@@ -11,12 +11,6 @@ FROM $DOCKER_REPOSITORY/gotenberg:$GOTENBERG_VERSION
 
 USER root
 
-COPY --from=golang /usr/local/go /usr/local/go
-COPY ./test/docker-entrypoint.sh /usr/bin/docker-entrypoint.sh
-COPY ./test/golint.sh /usr/bin/golint
-COPY ./test/gotest.sh /usr/bin/gotest
-COPY ./test/gotodos.sh /usr/bin/gotodos
-
 ENV GOPATH /go
 ENV PATH $GOPATH/bin:/usr/local/go/bin:$PATH
 ENV CGO_ENABLED 1
@@ -39,6 +33,12 @@ RUN apt-get update -qq &&\
     sed -i 's#/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin#/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/go/bin:/usr/local/go/bin#g' /etc/sudoers &&\
     curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin $GOLANGCI_LINT_VERSION
 
+COPY --from=golang /usr/local/go /usr/local/go
+COPY ./test/docker-entrypoint.sh /usr/bin/docker-entrypoint.sh
+COPY ./test/golint.sh /usr/bin/golint
+COPY ./test/gotest.sh /usr/bin/gotest
+COPY ./test/gotodos.sh /usr/bin/gotodos
+
 # Pristine working directory.
 WORKDIR /tests