chore(deps): update dependency go to v1.26.0

Reviewed-on: #7

.dockerignore

@@ -0,0 +1 @@
+prometheus-fail2ban-exporter

.editorconfig

@@ -0,0 +1,13 @@
+# Editor configuration, see http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = false
+trim_trailing_whitespace = true
+
+[{Makefile,*.go}]
+indent_style = tab

.gitea/workflows/golang-linters.yaml

@@ -0,0 +1,29 @@
+name: "Lint Golang files"
+
+on:
+  pull_request:
+    types: [ "opened", "reopened", "synchronize" ]
+  push:
+    branches: [ '**' ]
+    tags-ignore: [ '**' ]
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+
+jobs:
+  golangci:
+    name: "Run golang CI linter"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        go: [ stable ]
+        os: [ ubuntu-latest-amd64, ubuntu-latest-arm64 ]
+    steps:
+    - uses: actions/checkout@v6.0.2
+    - uses: actions/setup-go@v6.2.0
+      with:
+        go-version: ${{ matrix.go }}
+    - uses: golangci/golangci-lint-action@v9.2.0
+      with:
+        version: v2.8.0 # renovate: datasource=github-releases depName=golangci/golangci-lint

.gitea/workflows/golang-tests.yaml

@@ -0,0 +1,57 @@
+name: "Run Golang tests"
+
+on:
+  pull_request:
+    types: [ "opened", "reopened", "synchronize" ]
+  push:
+    branches: [ '**' ]
+    tags-ignore: [ '**' ]
+  workflow_dispatch: {}
+
+jobs:
+  # integration-test:
+  #   name: "Run integration tests"
+  #   runs-on: ${{ matrix.os }}
+  #   strategy:
+  #     matrix:
+  #       go: [ stable ]
+  #       os: [ ubuntu-latest-amd64, ubuntu-latest-arm64 ]
+  #   steps:
+  #   - uses: actions/checkout@v4.3.0
+  #   - uses: actions/setup-go@v5.5.0
+  #     with:
+  #       go-version: ${{ matrix.go }}
+  #   - env:
+  #       GOPROXY: ${{ vars.GOPROXY }}
+  #     run: make test/integration
+
+  unit-test:
+    name: "Run unit tests"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        go: [ stable ]
+        os: [ ubuntu-latest-amd64, ubuntu-latest-arm64 ]
+    steps:
+    - uses: actions/checkout@v6.0.2
+    - uses: actions/setup-go@v6.2.0
+      with:
+        go-version: ${{ matrix.go }}
+    - env:
+        GOPROXY: ${{ vars.GOPROXY }}
+      run: make test/unit
+    - id: coverage
+      name: Check coverage
+      run: |
+        coverage="$(make test/coverage | grep total | awk '{ print substr($3, 1, length($3)-1); }')"
+        echo "total_coverage=$coverage" >> $GITHUB_OUTPUT
+        echo "Total coverage: ${coverage}%"
+    - name: Fail if coverage is to low
+      run: |
+        threshold=5
+        total_coverage=${{ steps.coverage.outputs.total_coverage }}
+
+        if (( ${total_coverage%.*} < ${threshold} )); then
+          echo "ERROR: Coverage (${total_coverage}%) is below the threshold (${threshold}%)." 1>&2
+          exit 1
+        fi

.gitea/workflows/markdown-linters.yaml

@@ -0,0 +1,19 @@
+name: "Lint Markdown files"
+
+on:
+  pull_request:
+    types: [ "opened", "reopened", "synchronize" ]
+  push:
+    branches: [ '*' ]
+    tags-ignore: [ '*' ]
+  workflow_dispatch: {}
+
+jobs:
+  markdown-lint:
+    name: "Run markdown linter"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v6.0.2
+    - uses: DavidAnson/markdownlint-cli2-action@v21.0.0
+      with:
+        globs: '**/*.md'

.gitea/workflows/release.yaml

@@ -0,0 +1,53 @@
+name: "Release"
+
+on:
+  push:
+    tags: [ '**' ]
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    name: "Release application"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v6.0.2
+    - uses: docker/setup-qemu-action@v3.7.0
+    - uses: actions/setup-go@v6.2.0
+      with:
+        go-version: stable
+    - uses: docker/login-action@v3.7.0
+      with:
+        registry: git.cryptic.systems
+        username: ${{ github.repository_owner }}
+        password: ${{ secrets.GIT_CRYPTIC_SYSTEMS_PACKAGE_REGISTRY_TOKEN }}
+    - env:
+        GITEA_TOKEN: ${{ secrets.GIT_CRYPTIC_SYSTEMS_PACKAGE_REGISTRY_TOKEN }}
+        GONOSUMDB: ${{ vars.GONOSUMDB }}
+        GOPROXY: ${{ vars.GOPROXY }}
+      uses: goreleaser/goreleaser-action@v6.4.0
+      with:
+        version: v2.13.3 # renovate: datasource=github-releases depName=goreleaser/goreleaser
+        args: release --clean
+
+  sync-to-hub-docker-io:
+    name: "Upload Images to docker.io"
+    needs:
+    - release
+    runs-on: ubuntu-latest
+    steps:
+    - name: Copy images to docker.io
+      run: |
+        TAG=$(echo ${{ github.ref_name }} | sed 's/v//gm')
+
+        apt-get update --yes
+        apt-get install --yes skopeo
+        skopeo copy \
+          --all \
+          --dest-password ${{ secrets.DOCKER_IO_PASSWORD }} \
+          --dest-username ${{ secrets.DOCKER_IO_USERNAME }} \
+          --src-password ${{ secrets.GIT_CRYPTIC_SYSTEMS_PACKAGE_REGISTRY_TOKEN }} \
+          --src-username volker.raschek \
+            docker://git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter:${TAG} \
+            docker://docker.io/volkerraschek/prometheus-fail2ban-exporter:${TAG}

.gitea/workflows/update-docker-hub-description.yaml

@@ -0,0 +1,20 @@
+name: Update Docker Hub Description
+
+on:
+  push:
+    branches: [ 'master' ]
+    paths: [ 'README.md' ]
+  workflow_dispatch: {}
+
+jobs:
+  update-description-on-hub-docker-io:
+    runs-on:
+    - ubuntu-latest
+    steps:
+    - uses: actions/checkout@v6.0.2
+    - uses: peter-evans/dockerhub-description@v5.0.0
+      with:
+        username: ${{ secrets.DOCKER_IO_USERNAME }}
+        password: ${{ secrets.DOCKER_IO_PASSWORD }}
+        repository: volkerraschek/prometheus-fail2ban-exporter
+        readme-filepath: README.md

.gitignore

@@ -1,8 +1,3 @@
-.idea/
+prometheus-fail2ban-exporter
-vendor/
+coverage.*
-*.iml
+dist
-
-build/
-dist/
-
-fail2ban_exporter

.gitlab-ci.yml

@@ -1,58 +0,0 @@
-stages:
-  - test
-  - build
-  - release
-
-.go_template:
-  image: golang:latest
-
-dependencies:
-  extends: .go_template
-  stage: test
-  script:
-    - make check/dependencies
-
-format:
-  extends: .go_template
-  stage: test
-  script:
-    - make check/fmt
-
-test:
-  extends: .go_template
-  stage: test
-  script:
-    - make test
-
-build:
-  extends: .go_template
-  stage: build
-  script:
-    - make build
-  artifacts:
-    paths:
-      - fail2ban_exporter
-    expire_in: 1 day
-
-release:
-  stage: release
-  image: docker:stable
-  services:
-    - docker:dind
-  variables:
-    DOCKER_REGISTRY: $CI_REGISTRY
-    DOCKER_USERNAME: $CI_REGISTRY_USER
-    DOCKER_PASSWORD: $CI_REGISTRY_PASSWORD
-    GIT_DEPTH: 0
-  rules:
-    - if: $CI_COMMIT_TAG =~ /^v.*$/
-  script: |
-    # GITLAB_TOKEN is needed to create GitLab releases.
-    # DOCKER_* are needed to push Docker images.
-    docker run --rm --privileged \
-      -v $PWD:/go/src/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter \
-      -w /go/src/gitlab.com/hectorjsmith/fail2ban-prometheus-exporter \
-      -v /var/run/docker.sock:/var/run/docker.sock \
-      -e DOCKER_USERNAME -e DOCKER_PASSWORD -e DOCKER_REGISTRY  \
-      -e GITLAB_TOKEN \
-      goreleaser/goreleaser release --clean

.golangci.yaml

@@ -0,0 +1,13 @@
+version: "2"
+linters:
+  default: standard
+  enable:
+  - errname
+  - gosec
+
+  exclusions:
+    rules: []
+    warn-unused: true
+
+run:
+  tests: true

.goreleaser.yaml

@@ -0,0 +1,175 @@
+project_name: prometheus-fail2ban-exporter
+
+archives:
+- formats: [ "tar.xz" ]
+  files:
+  - README.md
+  - LICENSE
+
+before:
+  hooks:
+  - go mod tidy
+
+builds:
+- main: main.go
+  binary: >-
+    {{ .ProjectName }}-
+    {{- .Version }}-
+    {{- .Os }}-
+    {{- if eq .Arch "amd64" }}amd64
+    {{- else if eq .Arch "amd64_v1" }}amd64
+    {{- else }}{{ .Arch }}{{ end }}
+    {{- if .Arm }}-{{ .Arm }}{{ end }}
+  env:
+  - CGO_ENABLED=0
+  - GONOSUMDB={{ .Env.GONOSUMDB }}
+  - GOPROXY={{ .Env.GOPROXY }}
+  goos:
+  - linux
+  goarch:
+  - amd64
+  - arm
+  - arm64
+  - riscv64
+  goarm:
+  - "6"
+  - "7"
+  flags:
+  - -trimpath
+  ldflags:
+  - -s -w -X 'main.version={{ trimprefix .Tag "v" }}' -X 'main.date={{ time "2006-01-02T15:04:05Z07:00" }}'
+
+changelog:
+  filters:
+    exclude:
+    - '^chore'
+    - '^docs'
+    - '^test'
+    - Merge pull request
+    - Merge branch
+    - go mod tidy
+  format: "{{.SHA}}: {{.Message}} (@{{.AuthorUsername}})"
+  groups:
+  - title: Features
+    regexp: '^.*?feat(\([[:word:]]+\))??!?:.+$'
+    order: 0
+  - title: "Bug fixes"
+    regexp: '^.*?fix(\([[:word:]]+\))??!?:.+$'
+    order: 1
+  - title: Others
+    order: 999
+  sort: asc
+  use: git
+
+dockers:
+- build_flag_templates:
+  - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
+  - --label=org.opencontainers.image.description={{ .ProjectName }}
+  - --label=org.opencontainers.image.documentation={{ .ProjectName }}
+  - --label=org.opencontainers.image.revision={{ .FullCommit }}
+  - --label=org.opencontainers.image.source={{ .GitURL }}
+  - --label=org.opencontainers.image.title={{ .ProjectName }}
+  - --label=org.opencontainers.image.url=https://git.cryptic.systems/volker.raschek/{{ .ProjectName }}
+  - --label=org.opencontainers.image.version={{ trimprefix .Tag "v" }}
+  - --platform=linux/amd64
+  - --pull
+  dockerfile: Dockerfile
+  goarch: amd64
+  goos: linux
+  image_templates:
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-amd64'
+  skip_push: false
+  use: buildx
+
+- build_flag_templates:
+  - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
+  - --label=org.opencontainers.image.description={{ .ProjectName }}
+  - --label=org.opencontainers.image.documentation={{ .ProjectName }}
+  - --label=org.opencontainers.image.revision={{ .FullCommit }}
+  - --label=org.opencontainers.image.source={{ .GitURL }}
+  - --label=org.opencontainers.image.title={{ .ProjectName }}
+  - --label=org.opencontainers.image.url=https://git.cryptic.systems/volker.raschek/{{ .ProjectName }}
+  - --label=org.opencontainers.image.version={{ trimprefix .Tag "v" }}
+  - --platform=linux/arm/v6
+  - --pull
+  dockerfile: Dockerfile
+  goarch: arm
+  goarm: "6"
+  goos: linux
+  image_templates:
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-arm-v6'
+  skip_push: false
+  use: buildx
+
+- build_flag_templates:
+  - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
+  - --label=org.opencontainers.image.description={{ .ProjectName }}
+  - --label=org.opencontainers.image.documentation={{ .ProjectName }}
+  - --label=org.opencontainers.image.revision={{ .FullCommit }}
+  - --label=org.opencontainers.image.source={{ .GitURL }}
+  - --label=org.opencontainers.image.title={{ .ProjectName }}
+  - --label=org.opencontainers.image.url=https://git.cryptic.systems/volker.raschek/{{ .ProjectName }}
+  - --label=org.opencontainers.image.version={{ trimprefix .Tag "v" }}
+  - --platform=linux/arm/v7
+  - --pull
+  dockerfile: Dockerfile
+  goarch: arm
+  goarm: "7"
+  goos: linux
+  image_templates:
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-arm-v7'
+  skip_push: false
+  use: buildx
+
+- build_flag_templates:
+  - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
+  - --label=org.opencontainers.image.description={{ .ProjectName }}
+  - --label=org.opencontainers.image.documentation={{ .ProjectName }}
+  - --label=org.opencontainers.image.revision={{ .FullCommit }}
+  - --label=org.opencontainers.image.source={{ .GitURL }}
+  - --label=org.opencontainers.image.title={{ .ProjectName }}
+  - --label=org.opencontainers.image.url=https://git.cryptic.systems/volker.raschek/{{ .ProjectName }}
+  - --label=org.opencontainers.image.version={{ trimprefix .Tag "v" }}
+  - --platform=linux/arm64
+  - --pull
+  dockerfile: Dockerfile
+  goarch: arm64
+  goos: linux
+  image_templates:
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-arm64'
+  skip_push: false
+  use: buildx
+
+- build_flag_templates:
+  - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
+  - --label=org.opencontainers.image.description={{ .ProjectName }}
+  - --label=org.opencontainers.image.documentation={{ .ProjectName }}
+  - --label=org.opencontainers.image.revision={{ .FullCommit }}
+  - --label=org.opencontainers.image.source={{ .GitURL }}
+  - --label=org.opencontainers.image.title={{ .ProjectName }}
+  - --label=org.opencontainers.image.url=https://git.cryptic.systems/volker.raschek/{{ .ProjectName }}
+  - --label=org.opencontainers.image.version={{ trimprefix .Tag "v" }}
+  - --platform=linux/riscv64
+  - --pull
+  dockerfile: Dockerfile
+  goarch: riscv64
+  goos: linux
+  image_templates:
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-riscv64'
+  skip_push: false
+  use: buildx
+
+docker_manifests:
+- name_template: 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}'
+  image_templates:
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-amd64'
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-arm-v6'
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-arm-v7'
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-arm64'
+  - 'git.cryptic.systems/volker.raschek/{{ .ProjectName }}:{{ trimprefix .Tag "v" }}-riscv64'
+
+gitea_urls:
+  api: https://git.cryptic.systems/api/v1
+  download: https://git.cryptic.systems
+
+version: 2

.goreleaser.yml

@@ -1,45 +0,0 @@
-project_name: fail2ban_exporter
-builds:
-  -
-    binary: fail2ban_exporter
-    goos:
-      - linux
-      - darwin
-    goarch:
-      - amd64
-      - "386"
-      - arm
-      - arm64
-    goarm:
-      - "6"
-      - "7"
-
-dockers:
-- image_templates: ["registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:{{ .Version }}"]
-  dockerfile: Dockerfile
-  build_flag_templates:
-  - --label=org.opencontainers.image.title={{ .ProjectName }}
-  - --label=org.opencontainers.image.description={{ .ProjectName }}
-  - --label=org.opencontainers.image.url=https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
-  - --label=org.opencontainers.image.source=https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
-  - --label=org.opencontainers.image.version={{ .Version }}
-  - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
-  - --label=org.opencontainers.image.revision={{ .FullCommit }}
-  - --label=org.opencontainers.image.licenses=MIT
-
-changelog:
-  groups:
-    - title: "⛔ Breaking Changes"
-      regexp: '^.*?!:.+$'
-      order: 0
-    - title: "🎉 Features"
-      regexp: '^.*?feat(\(\w+\))??:.+$'
-      order: 1
-    - title: "🐛 Fixes"
-      regexp: '^.*?fix(\(\w+\))??:.+$'
-      order: 2
-    - title: "📑 Other"
-      order: 999
-  filters:
-    exclude:
-      - "^Merge"

.markdownlint.yaml

@@ -0,0 +1,136 @@
+# markdownlint YAML configuration
+# https://github.com/DavidAnson/markdownlint/blob/main/schema/.markdownlint.yaml
+
+# Default state for all rules
+default: true
+
+# Path to configuration file to extend
+extends: null
+
+# MD003/heading-style/header-style - Heading style
+MD003:
+  # Heading style
+  style: "atx"
+
+# MD004/ul-style - Unordered list style
+MD004:
+  style: "dash"
+
+# MD007/ul-indent - Unordered list indentation
+MD007:
+  # Spaces for indent
+  indent: 2
+  # Whether to indent the first level of the list
+  start_indented: false
+
+# MD009/no-trailing-spaces - Trailing spaces
+MD009:
+  # Spaces for line break
+  br_spaces: 2
+  # Allow spaces for empty lines in list items
+  list_item_empty_lines: false
+  # Include unnecessary breaks
+  strict: false
+
+# MD010/no-hard-tabs - Hard tabs
+MD010:
+  # Include code blocks
+  code_blocks: true
+
+# MD012/no-multiple-blanks - Multiple consecutive blank lines
+MD012:
+  # Consecutive blank lines
+  maximum: 1
+
+# MD013/line-length - Line length
+MD013:
+  # Number of characters
+  line_length: 120
+  # Number of characters for headings
+  heading_line_length: 120
+  # Number of characters for code blocks
+  code_block_line_length: 120
+  # Include code blocks
+  code_blocks: false
+  # Include tables
+  tables: false
+  # Include headings
+  headings: true
+  # Strict length checking
+  strict: false
+  # Stern length checking
+  stern: false
+
+# MD022/blanks-around-headings/blanks-around-headers - Headings should be surrounded by blank lines
+MD022:
+  # Blank lines above heading
+  lines_above: 1
+  # Blank lines below heading
+  lines_below: 1
+
+# MD025/single-title/single-h1 - Multiple top-level headings in the same document
+MD025:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD026/no-trailing-punctuation - Trailing punctuation in heading
+MD026:
+  # Punctuation characters
+  punctuation: ".,;:!。，；：！"
+
+# MD029/ol-prefix - Ordered list item prefix
+MD029:
+  # List style
+  style: "one_or_ordered"
+
+# MD030/list-marker-space - Spaces after list markers
+MD030:
+  # Spaces for single-line unordered list items
+  ul_single: 1
+  # Spaces for single-line ordered list items
+  ol_single: 1
+  # Spaces for multi-line unordered list items
+  ul_multi: 1
+  # Spaces for multi-line ordered list items
+  ol_multi: 1
+
+# MD033/no-inline-html - Inline HTML
+MD033:
+  # Allowed elements
+  allowed_elements: []
+
+# MD035/hr-style - Horizontal rule style
+MD035:
+  # Horizontal rule style
+  style: "---"
+
+# MD036/no-emphasis-as-heading/no-emphasis-as-header - Emphasis used instead of a heading
+MD036:
+  # Punctuation characters
+  punctuation: ".,;:!?。，；：！？"
+
+# MD041/first-line-heading/first-line-h1 - First line in a file should be a top-level heading
+MD041:
+  # Heading level
+  level: 1
+  # RegExp for matching title in front matter
+  front_matter_title: "^\\s*title\\s*[:=]"
+
+# MD044/proper-names - Proper names should have the correct capitalization
+MD044:
+  # List of proper names
+  names: []
+  # Include code blocks
+  code_blocks: false
+
+# MD046/code-block-style - Code block style
+MD046:
+  # Block style
+  style: "fenced"
+
+# MD048/code-fence-style - Code fence style
+MD048:
+  # Code fence syle
+  style: "backtick"

Dockerfile

@@ -1,10 +1,5 @@
-FROM debian:buster-slim
+FROM scratch AS build
 
-# Create main app folder to run from
+COPY prometheus-fail2ban-exporter-* /usr/bin/prometheus-fail2ban-exporter
-WORKDIR /app
 
-# Copy compiled binary to release image
+ENTRYPOINT [ "/usr/bin/prometheus-fail2ban-exporter" ]
-# (must build the binary before running docker build)
-COPY fail2ban_exporter /app/fail2ban_exporter
-
-ENTRYPOINT ["/app/fail2ban_exporter"]

LICENSE

@@ -1,6 +1,7 @@
 MIT License
 
 Copyright (c) 2021 Hector
+Copyright (c) 2023 Markus Pesch
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

Makefile

@@ -1,31 +1,118 @@
-.PHONY: download test fmt check/dependencies check/fmt build build/docker
+EXECUTABLE=prometheus-fail2ban-exporter
+VERSION?=$(shell git describe --abbrev=0)+hash.$(shell git rev-parse --short HEAD)
 
-download:
+# Destination directory and prefix to place the compiled binaries, documentaions
-	go mod download
+# and other files.
+DESTDIR?=
+PREFIX?=/usr/local
 
-test: download
+# CONTAINER_RUNTIME
-	go test ./... -v -race
+# The CONTAINER_RUNTIME variable will be used to specified the path to a
+# container runtime. This is needed to start and run a container image.
+CONTAINER_RUNTIME?=$(shell which podman)
 
-fmt: download
+# PROM_FAIL2BAN_EXP_IMAGE_REGISTRY_NAME
-	go fmt ./...
+# Defines the name of the new container to be built using several variables.
+PROM_FAIL2BAN_EXP_IMAGE_REGISTRY_NAME:=git.cryptic.systems
+PROM_FAIL2BAN_EXP_IMAGE_REGISTRY_USER:=volker.raschek
 
-check/dependencies: download
+PROM_FAIL2BAN_EXP_IMAGE_NAMESPACE?=${PROM_FAIL2BAN_EXP_IMAGE_REGISTRY_USER}
-	go mod tidy -v
+PROM_FAIL2BAN_EXP_IMAGE_NAME:=${EXECUTABLE}
-	git diff-index --quiet HEAD
+PROM_FAIL2BAN_EXP_IMAGE_VERSION?=latest
+PROM_FAIL2BAN_EXP_IMAGE_FULLY_QUALIFIED=${PROM_FAIL2BAN_EXP_IMAGE_REGISTRY_NAME}/${PROM_FAIL2BAN_EXP_IMAGE_NAMESPACE}/${PROM_FAIL2BAN_EXP_IMAGE_NAME}:${PROM_FAIL2BAN_EXP_IMAGE_VERSION}
 
-check/fmt: download
+# BIN
-	test -z $(shell gofmt -l .)
+# ==============================================================================
+prometheus-fail2ban-exporter:
+	CGO_ENABLED=0 \
+	GOPROXY=$(shell go env GOPROXY) \
+		go build -ldflags "-X 'main.version=${VERSION}' -X 'main.date=$(shell date --rfc-3339=seconds )'" -o ${@} main.go
 
-build:
+# CLEAN
-	go build \
+# ==============================================================================
-	-ldflags "\
+PHONY+=clean
-	-X main.version=${shell git describe --tags} \
+clean:
-	-X main.commit=${shell git rev-parse HEAD} \
+	rm --force --recursive prometheus-fail2ban-exporter
-	-X main.date=${shell date --iso-8601=seconds} \
-	-X main.builtBy=manual \
-	" \
-	-o fail2ban_exporter \
-	exporter.go
 
-build/docker: build
+# TESTS
-	docker build -t fail2ban-prometheus-exporter .
+# ==============================================================================
+PHONY+=test/unit
+test/unit:
+	CGO_ENABLED=0 \
+	GOPROXY=$(shell go env GOPROXY) \
+		go test -v -p 1 -coverprofile=coverage.out -covermode=count -timeout 1200s ./...
+
+PHONY+=test/integration
+test/integration:
+	CGO_ENABLED=0 \
+	GOPROXY=$(shell go env GOPROXY) \
+		go test -v -p 1 -count=1 -timeout 1200s ./it/...
+
+PHONY+=test/coverage
+test/coverage:
+	CGO_ENABLED=0 \
+	GOPROXY=$(shell go env GOPROXY) \
+		go tool cover -func=coverage.out
+
+# GOLANGCI-LINT
+# ==============================================================================
+PHONY+=golangci-lint
+golangci-lint:
+	golangci-lint run --concurrency=$(shell nproc)
+
+# INSTALL
+# ==============================================================================
+PHONY+=uninstall
+install: prometheus-fail2ban-exporter
+	install --directory ${DESTDIR}/etc/bash_completion.d
+	./prometheus-fail2ban-exporter completion bash > ${DESTDIR}/etc/bash_completion.d/${EXECUTABLE}
+
+	install --directory ${DESTDIR}${PREFIX}/bin
+	install --mode 0755 ${EXECUTABLE} ${DESTDIR}${PREFIX}/bin/${EXECUTABLE}
+
+	install --directory ${DESTDIR}${PREFIX}/share/licenses/${EXECUTABLE}
+	install --mode 0644 LICENSE ${DESTDIR}${PREFIX}/share/licenses/${EXECUTABLE}/LICENSE
+
+	install --directory ${DESTDIR}${PREFIX}/systemd/system
+	install --mode 0644 systemd/systemd.service ${DESTDIR}${PREFIX}/systemd/system/${EXECUTABLE}.service
+	sed --in-place --regexp-extended 's/EXECUTABLE/${EXECUTABLE}/gm' ${DESTDIR}${PREFIX}/systemd/system/${EXECUTABLE}.service
+
+# UNINSTALL
+# ==============================================================================
+PHONY+=uninstall
+uninstall:
+	-rm --force --recursive \
+		${DESTDIR}/etc/bash_completion.d/${EXECUTABLE} \
+		${DESTDIR}${PREFIX}/bin/${EXECUTABLE} \
+		${DESTDIR}${PREFIX}/share/licenses/${EXECUTABLE}
+
+# BUILD CONTAINER IMAGE
+# ==============================================================================
+PHONY+=container-image/build
+container-image/build:
+	${CONTAINER_RUNTIME} build \
+		--build-arg VERSION=${VERSION} \
+		--file Dockerfile \
+		--no-cache \
+		--pull \
+		--tag ${PROM_FAIL2BAN_EXP_IMAGE_FULLY_QUALIFIED} \
+		.
+
+# DELETE CONTAINER IMAGE
+# ==============================================================================
+PHONY:=container-image/delete
+container-image/delete:
+	- ${CONTAINER_RUNTIME} image rm ${PROM_FAIL2BAN_EXP_IMAGE_FULLY_QUALIFIED}
+
+# PUSH CONTAINER IMAGE
+# ==============================================================================
+PHONY+=container-image/push
+container-image/push:
+	echo ${PROM_FAIL2BAN_EXP_IMAGE_REGISTRY_PASSWORD} | ${CONTAINER_RUNTIME} login ${PROM_FAIL2BAN_EXP_IMAGE_REGISTRY_NAME} --username ${PROM_FAIL2BAN_EXP_IMAGE_REGISTRY_USER} --password-stdin
+	${CONTAINER_RUNTIME} push ${PROM_FAIL2BAN_EXP_IMAGE_FULLY_QUALIFIED}
+
+# PHONY
+# ==============================================================================
+# Declare the contents of the PHONY variable as phony.  We keep that information
+# in a variable so we can use it in if_changed.
+.PHONY: ${PHONY}

README.md

@@ -1,10 +1,10 @@
-# Fail2Ban Prometheus Exporter
+# prometheus-fail2ban-exporter
 
-[![Pipeline](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/badges/main/pipeline.svg)](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter)
+This is a fork of Hector's fail2ban [exporter](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter). This fork
-
+contains some changes to get the application running in a kubernetes cluster.
-Collect metrics from a running fail2ban instance.
 
 ## Table of Contents
+
 1. Quick Start
 2. Metrics
 3. Configuration
@@ -17,34 +17,40 @@ The exporter can be run as a standalone binary or a docker container.
 
 ### 1.1. Standalone
 
-The following command will start collecting metrics from the `/var/run/fail2ban/fail2ban.sock` file and expose them on port `9191`.
+The following command will start collecting metrics from the `/var/run/fail2ban/fail2ban.sock` file and expose them on
+port `9191`.
 
-```
+```bash
 $ fail2ban_exporter --collector.f2b.socket=/var/run/fail2ban/fail2ban.sock --web.listen-address=":9191"
 
-2022/02/20 09:54:06 fail2ban exporter version 0.5.0
+2022/02/20 09:54:06 fail2ban exporter version 0.8.1
 2022/02/20 09:54:06 starting server at :9191
 2022/02/20 09:54:06 reading metrics from fail2ban socket: /var/run/fail2ban/fail2ban.sock
 2022/02/20 09:54:06 metrics available at '/metrics'
 2022/02/20 09:54:06 ready
 ```
 
-Binary files for each release can be found on the [releases](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases) page.
+Binary files for each release can be found on the
+[releases](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/releases) page.
+
+There is also an [example systemd service file](/_examples/systemd/fail2ban_exporter.service) included in the
+repository. This is a starting point to run the exporter as a service.
 
 ### 1.2. Docker
 
-**Docker run**
+#### Docker run
-```
+
-docker run -d \
+```bash
+$ docker run -d \
     --name "fail2ban-exporter" \
     -v /var/run/fail2ban:/var/run/fail2ban:ro \
     -p "9191:9191" \
     registry.gitlab.com/hectorjsmith/fail2ban-prometheus-exporter:latest
 ```
 
-**Docker compose**
+#### Docker compose
 
-```
+```yaml
 version: "2"
 services:
   exporter:
@@ -55,12 +61,13 @@ services:
     - "9191:9191"
 ```
 
-Use the `:latest` tag to get the latest stable release. Or use the `:nightly` tag for the latest (unstable) version.
+Use the `:latest` tag to get the latest stable release. See the [registry
-See the [registry page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/container_registry) for all available tags.
+page](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/container_registry) for all available tags.
 
-**NOTE:** While it is possible to mount the `fail2ban.sock` file directly, it is recommended to mount the parent folder instead.
+**NOTE:** While it is possible to mount the `fail2ban.sock` file directly, it is recommended to mount the parent folder
-The `.sock` file is deleted by fail2ban on shutdown and re-created on startup and this causes problems for the docker mount.
+instead. The `.sock` file is deleted by fail2ban on shutdown and re-created on startup and this causes problems for the
-See [this reply](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/issues/11#note_665003499) for more details.
+docker mount. See [this reply](https://gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/-/issues/11#note_665003499)
+for more details.
 
 ## 2. Metrics
 
@@ -84,8 +91,10 @@ The exporter exposes the following metrics:
 | `jail_config_max_retry`      | The max number of failures allowed before banning an IP in this jail               | `f2b_config_jail_max_retries{jail="sshd"} 5`        |
 | `version`                    | Version string of the exporter and fail2ban                                        | `f2b_version{exporter="0.5.0",fail2ban="0.11.1"} 1` |
 
-The metrics above correspond to the matching fields in the `fail2ban-client status <jail>` command:
+The metrics above correspond to the matching fields in the `fail2ban-client
-```
+status <jail>` command:
+
+```text
 Status for the jail: sshd
 |- Filter
 |  |- Currently failed: 6
@@ -99,44 +108,52 @@ Status for the jail: sshd
 
 ### 2.1. Grafana
 
-The metrics exported by this tool are compatible with Prometheus and Grafana.
+The metrics exported by this tool are compatible with Prometheus and Grafana. A sample grafana dashboard can be found in
-A sample grafana dashboard can be found in the [grafana.json](/examples/grafana/dashboard.json) file.
+the [grafana.json](/_examples/grafana/dashboard.json) file. Just import the contents of this file into a new Grafana
-Just import the contents of this file into a new Grafana dashboard to get started.
+dashboard to get started.
 
-The dashboard supports displaying data from multiple exporters. Use the `instance` dashboard variable to select which ones to display.
+The dashboard supports displaying data from multiple exporters. Use the `instance` dashboard variable to select which
+ones to display.
 
 *(Sample dashboard is compatible with Grafana `9.1.8` and above)*
 
 ## 3. Configuration
 
-The exporter is configured with CLI flags and environment variables.
+The exporter is configured with CLI flags and environment variables. There are no configuration files.
-There are no configuration files.
 
-**CLI flags**
+### CLI flags
-```
+
-usage: exporter [<flags>]
+```text
+🚀 Collect prometheus metrics from a running Fail2Ban instance
 
 Flags:
-  -h, --help     Show context-sensitive help (also try --help-long and --help-man).
+  -h, --help                          Show context-sensitive help.
-  -v, --version  show version info and exit
+  -v, --version                       Show version info and exit
+      --dry-run                       Attempt to connect to the fail2ban socket then exit
+                                      before starting the server
+      --web.listen-address=":9191"    Address to use for the metrics server
+                                      ($F2B_WEB_LISTEN_ADDRESS)
       --collector.f2b.socket="/var/run/fail2ban/fail2ban.sock"
-                 path to the fail2ban server socket
+                                      Path to the fail2ban server socket
-      --collector.textfile.directory=""  
+                                      ($F2B_COLLECTOR_SOCKET)
-                 directory to read text files with metrics from
-      --web.listen-address=":9191"  
-                 address to use for the metrics server
-      --web.basic-auth.username=""  
-                 username to use to protect endpoints with basic auth
-      --web.basic-auth.password=""  
-                 password to use to protect endpoints with basic auth
       --collector.f2b.exit-on-socket-connection-error
-                 when set to true the exporter will immediately exit on a fail2ban socket connection error
+                                      When set to true the exporter will immediately
+                                      exit on a fail2ban socket connection error
+                                      ($F2B_EXIT_ON_SOCKET_CONN_ERROR)
+      --collector.textfile.directory=STRING
+                                      Directory to read text files with metrics from
+                                      ($F2B_COLLECTOR_TEXT_PATH)
+      --web.basic-auth.username=STRING
+                                      Username to use to protect endpoints with basic auth
+                                      ($F2B_WEB_BASICAUTH_USER)
+      --web.basic-auth.password=STRING
+                                      Password to use to protect endpoints with basic auth
+                                      ($F2B_WEB_BASICAUTH_PASS)
 ```
 
-**Environment variables**
+### Environment variables
 
-Each environment variable corresponds to a CLI flag.
+Each environment variable corresponds to a CLI flag. If both are specified, the CLI flag takes precedence.
-If both are specified, the CLI flag takes precedence.
 
 | Environment variable            | Corresponding CLI flag                            |
 |---------------------------------|---------------------------------------------------|
@@ -149,12 +166,14 @@ If both are specified, the CLI flag takes precedence.
 
 ## 4. Building from source
 
-The simplest way to build the project is to run the `build/snapshot` make command.
+Building from source has the following dependencies:
-This will use `goreleaser` to build out binaries and archives for the project.
-Binaries are stored in the `dist/` folder.
 
-Alternatively, `go mod download` and `go build` can be used from the `src/` folder to build out the project.
+- Go v1.20
-This will download dependencies and build the project.
+- Make
+
+From there, simply run `make build`
+
+This will download the necessary dependencies and build a `fail2ban_exporter` binary in the root of the project.
 
 ## 5. Textfile metrics
 
@@ -162,12 +181,12 @@ For more flexibility the exporter also allows exporting metrics collected from a
 
 To enable textfile metrics provide the directory to read files from with the `--collector.textfile.directory` flag.
 
-Metrics collected from these files will be exposed directly alongside the other metrics without any additional processing.
+Metrics collected from these files will be exposed directly alongside the other metrics without any additional
-This means that it is the responsibility of the file creator to ensure the format is correct.
+processing. This means that it is the responsibility of the file creator to ensure the format is correct.
 
 By exporting textfile metrics an extra metric is also exported with an error count for each file:
 
-```
+```text
 # HELP textfile_error Checks for errors while reading text files
 # TYPE textfile_error gauge
 textfile_error{path="file.prom"} 0
@@ -175,15 +194,17 @@ textfile_error{path="file.prom"} 0
 
 **NOTE:** Any file not ending with `.prom` will be ignored.
 
-**Running in Docker**
+### Running in Docker
 
 To collect textfile metrics inside a docker container, a couple of things need to be done:
+
 1. Mount the folder with the metrics files
 2. Set the `F2B_COLLECTOR_TEXT_PATH` environment variable
 
 *For example:*
-```
+
-docker run -d \
+```bash
+$ docker run -d \
     --name "fail2ban-exporter" \
     -v /var/run/fail2ban:/var/run/fail2ban:ro \
     -v /path/to/metrics:/app/metrics/:ro \

_examples/grafana/dashboard.json

@@ -68,7 +68,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "${DS_PROMETHEUS}"
+        "uid": "prometheus"
       },
       "description": "",
       "fieldConfig": {
@@ -129,7 +129,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "${DS_PROMETHEUS}"
+            "uid": "prometheus"
           },
           "editorMode": "code",
           "exemplar": false,
@@ -143,7 +143,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "${DS_PROMETHEUS}"
+            "uid": "prometheus"
           },
           "editorMode": "code",
           "exemplar": false,
@@ -158,7 +158,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "${DS_PROMETHEUS}"
+            "uid": "prometheus"
           },
           "editorMode": "code",
           "exemplar": false,
@@ -230,7 +230,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "${DS_PROMETHEUS}"
+        "uid": "prometheus"
       },
       "description": "",
       "fieldConfig": {
@@ -309,7 +309,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "${DS_PROMETHEUS}"
+            "uid": "prometheus"
           },
           "editorMode": "code",
           "exemplar": true,
@@ -328,7 +328,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "${DS_PROMETHEUS}"
+        "uid": "prometheus"
       },
       "description": "",
       "fieldConfig": {
@@ -407,7 +407,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "${DS_PROMETHEUS}"
+            "uid": "prometheus"
           },
           "editorMode": "code",
           "exemplar": true,
@@ -425,7 +425,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "${DS_PROMETHEUS}"
+        "uid": "prometheus"
       },
       "description": "",
       "fieldConfig": {
@@ -504,7 +504,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "${DS_PROMETHEUS}"
+            "uid": "prometheus"
           },
           "editorMode": "code",
           "exemplar": true,
@@ -522,7 +522,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "${DS_PROMETHEUS}"
+        "uid": "prometheus"
       },
       "description": "",
       "fieldConfig": {
@@ -601,7 +601,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "${DS_PROMETHEUS}"
+            "uid": "prometheus"
           },
           "editorMode": "code",
           "exemplar": true,
@@ -619,7 +619,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "${DS_PROMETHEUS}"
+        "uid": "prometheus"
       },
       "description": "",
       "fieldConfig": {
@@ -699,7 +699,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "${DS_PROMETHEUS}"
+            "uid": "prometheus"
           },
           "editorMode": "code",
           "exemplar": true,
@@ -717,7 +717,7 @@
     {
       "datasource": {
         "type": "prometheus",
-        "uid": "${DS_PROMETHEUS}"
+        "uid": "prometheus"
       },
       "description": "",
       "fieldConfig": {
@@ -797,7 +797,7 @@
         {
           "datasource": {
             "type": "prometheus",
-            "uid": "${DS_PROMETHEUS}"
+            "uid": "prometheus"
           },
           "editorMode": "code",
           "exemplar": true,
@@ -842,7 +842,7 @@
         "current": {},
         "datasource": {
           "type": "prometheus",
-          "uid": "${DS_PROMETHEUS}"
+          "uid": "prometheus"
         },
         "definition": "f2b_up",
         "description": "Select which instance(s) to show",

_examples/systemd/README.md

@@ -1,7 +1,9 @@
 # Systemd
 
 The `.service` file in this directory should be copied to the `/etc/systemd/system/` folder.
+
 - It expects the binary file to be installed at `/usr/sbin/fail2ban_exporter`.
-- It expects a user named `fail2ban_exporter` to exist. This user should not have a shell or any special privileges aside from read-access to the fail2ban socket file.
+- It expects a user named `fail2ban_exporter` to exist. This user should not have a shell or any special privileges
+  aside from read-access to the fail2ban socket file.
 
 The `ExecStart` line can be modified to add any custom CLI flags.

auth/basic.go

@@ -0,0 +1,29 @@
+package auth
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func NewBasicAuthProvider(username, password string) AuthProvider {
+	return &basicAuthProvider{
+		hashedAuth: encodeBasicAuth(username, password),
+	}
+}
+
+type basicAuthProvider struct {
+	hashedAuth string
+}
+
+func (p *basicAuthProvider) IsAllowed(request *http.Request) bool {
+	username, password, ok := request.BasicAuth()
+	if !ok {
+		return false
+	}
+	requestAuth := encodeBasicAuth(username, password)
+	return p.hashedAuth == requestAuth
+}
+
+func encodeBasicAuth(username, password string) string {
+	return HashString(fmt.Sprintf("%s:%s", username, password))
+}

auth/basic_test.go

@@ -0,0 +1,53 @@
+package auth
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func Test_GIVEN_BasicAuthSet_WHEN_CallingIsAllowedWithCorrectCreds_THEN_TrueReturned(t *testing.T) {
+	// assemble
+	username := "u1"
+	password := HashString("abc")
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	request.SetBasicAuth(username, password)
+	provider := NewBasicAuthProvider(username, password)
+
+	// act
+	result := provider.IsAllowed(request)
+
+	// assert
+	if !result {
+		t.Errorf("expected request to be allowed, but failed")
+	}
+}
+
+func Test_GIVEN_BasicAuthSet_WHEN_CallingIsAllowedWithoutCreds_THEN_FalseReturned(t *testing.T) {
+	// assemble
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	provider := NewBasicAuthProvider("u1", "p1")
+
+	// act
+	result := provider.IsAllowed(request)
+
+	// assert
+	if result {
+		t.Errorf("expected request to be denied, but was allowed")
+	}
+}
+
+func Test_GIVEN_BasicAuthSet_WHEN_CallingIsAllowedWithWrongCreds_THEN_FalseReturned(t *testing.T) {
+	// assemble
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	request.SetBasicAuth("wrong", "pw")
+	provider := NewBasicAuthProvider("u1", "p1")
+
+	// act
+	result := provider.IsAllowed(request)
+
+	// assert
+	if result {
+		t.Errorf("expected request to be denied, but was allowed")
+	}
+}

auth/empty.go

@@ -0,0 +1,14 @@
+package auth
+
+import "net/http"
+
+func NewEmptyAuthProvider() AuthProvider {
+	return &emptyAuthProvider{}
+}
+
+type emptyAuthProvider struct {
+}
+
+func (p *emptyAuthProvider) IsAllowed(request *http.Request) bool {
+	return true
+}

auth/empty_test.go

@@ -0,0 +1,36 @@
+package auth
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+func Test_GIVEN_EmptyAuth_WHEN_CallingIsAllowedWithoutAuth_THEN_TrueReturned(t *testing.T) {
+	// assemble
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	provider := NewEmptyAuthProvider()
+
+	// act
+	response := provider.IsAllowed(request)
+
+	// assert
+	if !response {
+		t.Errorf("expected request to be allowed, but failed")
+	}
+}
+
+func Test_GIVEN_EmptyAuth_WHEN_CallingIsAllowedWithAuth_THEN_TrueReturned(t *testing.T) {
+	// assemble
+	request := httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+	request.SetBasicAuth("user", "pass")
+	provider := NewEmptyAuthProvider()
+
+	// act
+	response := provider.IsAllowed(request)
+
+	// assert
+	if !response {
+		t.Errorf("expected request to be allowed, but failed")
+	}
+}

auth/hash.go

@@ -5,7 +5,7 @@ import (
 	"encoding/hex"
 )
 
-func Hash(data []byte) []byte {
+func hash(data []byte) []byte {
 	if len(data) == 0 {
 		return []byte{}
 	}
@@ -14,5 +14,5 @@ func Hash(data []byte) []byte {
 }
 
 func HashString(data string) string {
-	return hex.EncodeToString(Hash([]byte(data)))
+	return hex.EncodeToString(hash([]byte(data)))
 }

auth/middleware.go

@@ -1,31 +0,0 @@
-package auth
-
-import (
-	"net/http"
-)
-
-type BasicAuthProvider interface {
-	Enabled() bool
-	DoesBasicAuthMatch(username, password string) bool
-}
-
-func BasicAuthMiddleware(handlerFunc http.HandlerFunc, basicAuthProvider BasicAuthProvider) http.HandlerFunc {
-	if basicAuthProvider.Enabled() {
-		return func(w http.ResponseWriter, r *http.Request) {
-			if doesBasicAuthMatch(r, basicAuthProvider) {
-				handlerFunc.ServeHTTP(w, r)
-			} else {
-				w.WriteHeader(http.StatusUnauthorized)
-			}
-		}
-	}
-	return handlerFunc
-}
-
-func doesBasicAuthMatch(r *http.Request, basicAuthProvider BasicAuthProvider) bool {
-	rawUsername, rawPassword, ok := r.BasicAuth()
-	if ok {
-		return basicAuthProvider.DoesBasicAuthMatch(rawUsername, rawPassword)
-	}
-	return false
-}

auth/middleware_test.go

@@ -1,58 +0,0 @@
-package auth
-
-import (
-	"net/http"
-	"net/http/httptest"
-	"testing"
-)
-
-type testAuthProvider struct {
-	enabled bool
-	match   bool
-}
-
-func (p testAuthProvider) Enabled() bool {
-	return p.enabled
-}
-
-func (p testAuthProvider) DoesBasicAuthMatch(username, password string) bool {
-	return p.match
-}
-
-func newTestRequest() *http.Request {
-	return httptest.NewRequest(http.MethodGet, "http://example.com", nil)
-}
-
-func executeBasicAuthMiddlewareTest(t *testing.T, authEnabled bool, authMatches bool, expectedCode int, expectedCallCount int) {
-	callCount := 0
-	testHandler := func(w http.ResponseWriter, r *http.Request) {
-		callCount++
-	}
-
-	handler := BasicAuthMiddleware(testHandler, testAuthProvider{enabled: authEnabled, match: authMatches})
-	recorder := httptest.NewRecorder()
-	request := newTestRequest()
-	if authEnabled {
-		request.SetBasicAuth("test", "test")
-	}
-	handler.ServeHTTP(recorder, request)
-
-	if recorder.Code != expectedCode {
-		t.Errorf("statusCode = %v, want %v", recorder.Code, expectedCode)
-	}
-	if callCount != expectedCallCount {
-		t.Errorf("callCount = %v, want %v", callCount, expectedCallCount)
-	}
-}
-
-func Test_GIVEN_DisabledBasicAuth_WHEN_MethodCalled_THEN_RequestProcessed(t *testing.T) {
-	executeBasicAuthMiddlewareTest(t, false, false, http.StatusOK, 1)
-}
-
-func Test_GIVEN_EnabledBasicAuth_WHEN_MethodCalledWithCorrectCredentials_THEN_RequestProcessed(t *testing.T) {
-	executeBasicAuthMiddlewareTest(t, true, true, http.StatusOK, 1)
-}
-
-func Test_GIVEN_EnabledBasicAuth_WHEN_MethodCalledWithIncorrectCredentials_THEN_RequestRejected(t *testing.T) {
-	executeBasicAuthMiddlewareTest(t, true, false, http.StatusUnauthorized, 0)
-}

auth/provider.go

@@ -0,0 +1,9 @@
+package auth
+
+import (
+	"net/http"
+)
+
+type AuthProvider interface {
+	IsAllowed(*http.Request) bool
+}

cfg/basicAuth.go

@@ -1,25 +0,0 @@
-package cfg
-
-import "gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
-
-type hashedBasicAuth struct {
-	username string
-	password string
-}
-
-func newHashedBasicAuth(rawUsername, rawPassword string) *hashedBasicAuth {
-	return &hashedBasicAuth{
-		username: auth.HashString(rawUsername),
-		password: auth.HashString(rawPassword),
-	}
-}
-
-func (p *hashedBasicAuth) Enabled() bool {
-	return len(p.username) > 0 && len(p.password) > 0
-}
-
-func (p *hashedBasicAuth) DoesBasicAuthMatch(rawUsername, rawPassword string) bool {
-	username := auth.HashString(rawUsername)
-	password := auth.HashString(rawPassword)
-	return username == p.username && password == p.password
-}

cfg/basicAuth_test.go

@@ -1,60 +0,0 @@
-package cfg
-
-import "testing"
-
-func Test_hashedBasicAuth_DoesBasicAuthMatch(t *testing.T) {
-	type args struct {
-		username string
-		password string
-	}
-	type fields struct {
-		username string
-		password string
-	}
-	tests := []struct {
-		name   string
-		fields fields
-		args   args
-		want   bool
-	}{
-		{"Happy test #1", fields{username: "1234", password: "1234"}, args{username: "1234", password: "1234"}, true},
-		{"Happy test #2", fields{username: "test", password: "1234"}, args{username: "test", password: "1234"}, true},
-		{"Happy test #3", fields{username: "TEST", password: "1234"}, args{username: "TEST", password: "1234"}, true},
-		{"Non match #1", fields{username: "test", password: "1234"}, args{username: "1234", password: "1234"}, false},
-		{"Non match #2", fields{username: "1234", password: "test"}, args{username: "1234", password: "1234"}, false},
-		{"Non match #3", fields{username: "1234", password: "test"}, args{username: "1234", password: "TEST"}, false},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			basicAuth := newHashedBasicAuth(tt.fields.username, tt.fields.password)
-			if got := basicAuth.DoesBasicAuthMatch(tt.args.username, tt.args.password); got != tt.want {
-				t.Errorf("DoesBasicAuthMatch() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}
-
-func Test_hashedBasicAuth_Enabled(t *testing.T) {
-	type fields struct {
-		username string
-		password string
-	}
-	tests := []struct {
-		name   string
-		fields fields
-		want   bool
-	}{
-		{"Both blank", fields{username: "", password: ""}, false},
-		{"Single blank #1", fields{username: "test", password: ""}, false},
-		{"Single blank #1", fields{username: "", password: "test"}, false},
-		{"Both populated", fields{username: "test", password: "test"}, true},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			basicAuth := newHashedBasicAuth(tt.fields.username, tt.fields.password)
-			if got := basicAuth.Enabled(); got != tt.want {
-				t.Errorf("Enabled() = %v, want %v", got, tt.want)
-			}
-		})
-	}
-}

cfg/cfg.go

@@ -2,108 +2,83 @@ package cfg
 
 import (
 	"fmt"
-	"github.com/alecthomas/kingpin/v2"
+	"log"
 	"os"
+
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/auth"
+	"github.com/alecthomas/kong"
 )
 
-const (
+var cliStruct struct {
-	socketEnvName                = "F2B_COLLECTOR_SOCKET"
+	VersionMode          bool   `name:"version" short:"v" help:"Show version info and exit"`
-	fileCollectorPathEnvName     = "F2B_COLLECTOR_TEXT_PATH"
+	DryRunMode           bool   `name:"dry-run" help:"Attempt to connect to the fail2ban socket then exit before starting the server"`
-	addressEnvName               = "F2B_WEB_LISTEN_ADDRESS"
+	ServerAddress        string `name:"web.listen-address" env:"F2B_WEB_LISTEN_ADDRESS" help:"Address to use for the metrics server" default:"${default_address}"`
-	basicAuthUserEnvName         = "F2B_WEB_BASICAUTH_USER"
+	F2bSocketPath        string `name:"collector.f2b.socket" env:"F2B_COLLECTOR_SOCKET" help:"Path to the fail2ban server socket" default:"${default_socket}"`
-	basicAuthPassEnvName         = "F2B_WEB_BASICAUTH_PASS"
+	ExitOnSocketError    bool   `name:"collector.f2b.exit-on-socket-connection-error" env:"F2B_EXIT_ON_SOCKET_CONN_ERROR" help:"When set to true the exporter will immediately exit on a fail2ban socket connection error"`
-	exitOnSocketConnErrorEnvName = "F2B_EXIT_ON_SOCKET_CONN_ERROR"
+	TextFileExporterPath string `name:"collector.textfile.directory" env:"F2B_COLLECTOR_TEXT_PATH" help:"Directory to read text files with metrics from"`
-)
+	BasicAuthUser        string `name:"web.basic-auth.username" env:"F2B_WEB_BASICAUTH_USER" help:"Username to use to protect endpoints with basic auth"`
-
+	BasicAuthPass        string `name:"web.basic-auth.password" env:"F2B_WEB_BASICAUTH_PASS" help:"Password to use to protect endpoints with basic auth"`
-type AppSettings struct {
-	VersionMode           bool
-	MetricsAddress        string
-	Fail2BanSocketPath    string
-	FileCollectorPath     string
-	BasicAuthProvider     *hashedBasicAuth
-	ExitOnSocketConnError bool
-}
-
-func init() {
-	kingpin.HelpFlag.Short('h')
 }
 
 func Parse() *AppSettings {
-	settings := &AppSettings{}
+	ctx := kong.Parse(
-	readParamsFromCli(settings)
+		&cliStruct,
-	settings.validateFlags()
+		kong.Vars{
+			"default_socket":  "/var/run/fail2ban/fail2ban.sock",
+			"default_address": ":9191",
+		},
+		kong.Name("fail2ban_exporter"),
+		kong.Description("🚀 Export prometheus metrics from a running Fail2Ban instance"),
+		kong.UsageOnError(),
+	)
+
+	validateFlags(ctx)
+	settings := &AppSettings{
+		VersionMode:           cliStruct.VersionMode,
+		DryRunMode:            cliStruct.DryRunMode,
+		MetricsAddress:        cliStruct.ServerAddress,
+		Fail2BanSocketPath:    cliStruct.F2bSocketPath,
+		FileCollectorPath:     cliStruct.TextFileExporterPath,
+		ExitOnSocketConnError: cliStruct.ExitOnSocketError,
+		AuthProvider:          createAuthProvider(),
+	}
 	return settings
 }
 
-func readParamsFromCli(settings *AppSettings) {
+func createAuthProvider() auth.AuthProvider {
-	versionMode := kingpin.
+	username := cliStruct.BasicAuthUser
-		Flag("version", "show version info and exit").
+	password := cliStruct.BasicAuthPass
-		Short('v').
-		Default("false").
-		Bool()
-	socketPath := kingpin.
-		Flag("collector.f2b.socket", "path to the fail2ban server socket").
-		Default("/var/run/fail2ban/fail2ban.sock").
-		Envar(socketEnvName).
-		String()
-	fileCollectorPath := kingpin.
-		Flag("collector.textfile.directory", "directory to read text files with metrics from").
-		Default("").
-		Envar(fileCollectorPathEnvName).
-		String()
-	address := kingpin.
-		Flag("web.listen-address", "address to use for the metrics server").
-		Default(":9191").
-		Envar(addressEnvName).
-		String()
-	rawBasicAuthUsername := kingpin.
-		Flag("web.basic-auth.username", "username to use to protect endpoints with basic auth").
-		Default("").
-		Envar(basicAuthUserEnvName).
-		String()
-	rawBasicAuthPassword := kingpin.
-		Flag("web.basic-auth.password", "password to use to protect endpoints with basic auth").
-		Default("").
-		Envar(basicAuthPassEnvName).
-		String()
-	rawExitOnSocketConnError := kingpin.
-		Flag("collector.f2b.exit-on-socket-connection-error", "when set to true the exporter will immediately exit on a fail2ban socket connection error").
-		Default("false").
-		Envar(exitOnSocketConnErrorEnvName).
-		Bool()
 
-	kingpin.Parse()
+	if len(username) == 0 && len(password) == 0 {
-
+		return auth.NewEmptyAuthProvider()
-	settings.VersionMode = *versionMode
+	}
-	settings.MetricsAddress = *address
+	log.Print("basic auth enabled")
-	settings.Fail2BanSocketPath = *socketPath
+	return auth.NewBasicAuthProvider(username, password)
-	settings.FileCollectorPath = *fileCollectorPath
-	settings.setBasicAuthValues(*rawBasicAuthUsername, *rawBasicAuthPassword)
-	settings.ExitOnSocketConnError = *rawExitOnSocketConnError
 }
 
-func (settings *AppSettings) setBasicAuthValues(rawUsername, rawPassword string) {
+func validateFlags(cliCtx *kong.Context) {
-	settings.BasicAuthProvider = newHashedBasicAuth(rawUsername, rawPassword)
-}
-
-func (settings *AppSettings) validateFlags() {
 	var flagsValid = true
-	if !settings.VersionMode {
+	var messages = []string{}
-		if settings.Fail2BanSocketPath == "" {
+	if !cliStruct.VersionMode {
-			fmt.Println("error: fail2ban socket path must not be blank")
+		if cliStruct.F2bSocketPath == "" {
+			messages = append(messages, "error: fail2ban socket path must not be blank")
 			flagsValid = false
 		}
-		if settings.MetricsAddress == "" {
+		if cliStruct.ServerAddress == "" {
-			fmt.Println("error: invalid server address, must not be blank")
+			messages = append(messages, "error: invalid server address, must not be blank")
 			flagsValid = false
 		}
-		if (len(settings.BasicAuthProvider.username) > 0) != (len(settings.BasicAuthProvider.password) > 0) {
+		if (len(cliStruct.BasicAuthUser) > 0) != (len(cliStruct.BasicAuthPass) > 0) {
-			fmt.Println("error: to enable basic auth both the username and the password must be provided")
+			messages = append(messages, "error: to enable basic auth both the username and the password must be provided")
 			flagsValid = false
 		}
 	}
 	if !flagsValid {
-		kingpin.Usage()
+		_ = cliCtx.PrintUsage(false)
+		fmt.Println()
+		for i := 0; i < len(messages); i++ {
+			fmt.Println(messages[i])
+		}
 		os.Exit(1)
 	}
 }

cfg/settings.go

@@ -0,0 +1,13 @@
+package cfg
+
+import "git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/auth"
+
+type AppSettings struct {
+	VersionMode           bool
+	DryRunMode            bool
+	MetricsAddress        string
+	Fail2BanSocketPath    string
+	FileCollectorPath     string
+	AuthProvider          auth.AuthProvider
+	ExitOnSocketConnError bool
+}

collector/f2b/collector.go

@@ -1,11 +1,12 @@
 package f2b
 
 import (
-	"github.com/prometheus/client_golang/prometheus"
-	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
-	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/socket"
 	"log"
 	"os"
+
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/cfg"
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/socket"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 type Collector struct {
@@ -18,7 +19,8 @@ type Collector struct {
 }
 
 func NewExporter(appSettings *cfg.AppSettings, exporterVersion string) *Collector {
-	log.Printf("reading metrics from fail2ban socket: %s", appSettings.Fail2BanSocketPath)
+	log.Printf("reading fail2ban metrics from socket file: %s", appSettings.Fail2BanSocketPath)
+	printFail2BanServerVersion(appSettings.Fail2BanSocketPath)
 	return &Collector{
 		socketPath:                 appSettings.Fail2BanSocketPath,
 		exporterVersion:            exporterVersion,
@@ -48,7 +50,7 @@ func (c *Collector) Collect(ch chan<- prometheus.Metric) {
 			os.Exit(1)
 		}
 	} else {
-		defer s.Close()
+		defer func() { _ = s.Close() }()
 	}
 
 	c.collectServerUpMetric(ch, s)
@@ -58,3 +60,17 @@ func (c *Collector) Collect(ch chan<- prometheus.Metric) {
 	}
 	c.collectErrorCountMetric(ch)
 }
+
+func printFail2BanServerVersion(socketPath string) {
+	s, err := socket.ConnectToSocket(socketPath)
+	if err != nil {
+		log.Printf("error connecting to socket: %v", err)
+	} else {
+		version, err := s.GetServerVersion()
+		if err != nil {
+			log.Printf("error interacting with socket: %v", err)
+		} else {
+			log.Printf("successfully connected to fail2ban socket! fail2ban version: %s", version)
+		}
+	}
+}

collector/f2b/socket.go

@@ -1,9 +1,10 @@
 package f2b
 
 import (
-	"github.com/prometheus/client_golang/prometheus"
-	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/socket"
 	"log"
+
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/socket"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 const (

collector/textfile/collector.go

@@ -1,9 +1,10 @@
 package textfile
 
 import (
-	"github.com/prometheus/client_golang/prometheus"
-	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
 	"log"
+
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/cfg"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 type Collector struct {

collector/textfile/file.go

@@ -1,11 +1,12 @@
 package textfile
 
 import (
-	"github.com/prometheus/client_golang/prometheus"
-	"io/ioutil"
 	"log"
+	"os"
 	"path/filepath"
 	"strings"
+
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 const namespace = "textfile"
@@ -19,7 +20,7 @@ var (
 )
 
 func (c *Collector) collectFileContents() {
-	files, err := ioutil.ReadDir(c.folderPath)
+	files, err := os.ReadDir(c.folderPath)
 	if err != nil {
 		log.Printf("error reading directory '%s': %v", c.folderPath, err)
 		return
@@ -36,7 +37,8 @@ func (c *Collector) collectFileContents() {
 		}
 
 		fullPath := filepath.Join(c.folderPath, fileName)
-		content, err := ioutil.ReadFile(fullPath)
+		// #nosec G304
+		content, err := os.ReadFile(fullPath)
 		if err != nil {
 			c.appendErrorForPath(fileName)
 			log.Printf("error reading contents of file '%s': %v", fileName, err)

env

@@ -0,0 +1,6 @@
+# F2B_COLLECTOR_SOCKET=""
+# F2B_COLLECTOR_TEXT_PATH=""
+# F2B_WEB_LISTEN_ADDRESS=""
+# F2B_WEB_BASICAUTH_USER=""
+# F2B_WEB_BASICAUTH_PASS=""
+# F2B_EXIT_ON_SOCKET_CONN_ERROR=""

exporter.go

@@ -1,103 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/auth"
-	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/cfg"
-	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/f2b"
-	"gitlab.com/hectorjsmith/fail2ban-prometheus-exporter/collector/textfile"
-	"log"
-	"net/http"
-	"os"
-	"os/signal"
-	"syscall"
-)
-
-const (
-	metricsPath = "/metrics"
-)
-
-var (
-	version = "dev"
-	commit  = "none"
-	date    = "unknown"
-	builtBy = "unknown"
-)
-
-func printAppVersion() {
-	fmt.Println(version)
-	fmt.Printf("    build date:  %s\r\n    commit hash: %s\r\n    built by:    %s\r\n", date, commit, builtBy)
-}
-
-func rootHtmlHandler(w http.ResponseWriter, r *http.Request) {
-	_, err := w.Write([]byte(
-		`<html>
-			<head><title>Fail2Ban Exporter</title></head>
-			<body>
-			<h1>Fail2Ban Exporter</h1>
-			<p><a href="` + metricsPath + `">Metrics</a></p>
-			</body>
-		</html>`))
-	if err != nil {
-		log.Printf("error handling root url: %v", err)
-		w.WriteHeader(http.StatusInternalServerError)
-	}
-}
-
-func metricHandler(w http.ResponseWriter, r *http.Request, collector *textfile.Collector) {
-	promhttp.Handler().ServeHTTP(w, r)
-	collector.WriteTextFileMetrics(w, r)
-}
-
-func main() {
-	appSettings := cfg.Parse()
-	if appSettings.VersionMode {
-		printAppVersion()
-	} else {
-		handleGracefulShutdown()
-		log.Printf("fail2ban exporter version %s", version)
-		log.Printf("starting server at %s", appSettings.MetricsAddress)
-
-		f2bCollector := f2b.NewExporter(appSettings, version)
-		prometheus.MustRegister(f2bCollector)
-
-		textFileCollector := textfile.NewCollector(appSettings)
-		prometheus.MustRegister(textFileCollector)
-
-		http.HandleFunc("/", auth.BasicAuthMiddleware(rootHtmlHandler, appSettings.BasicAuthProvider))
-		http.HandleFunc(metricsPath, auth.BasicAuthMiddleware(
-			func(w http.ResponseWriter, r *http.Request) {
-				metricHandler(w, r, textFileCollector)
-			},
-			appSettings.BasicAuthProvider,
-		))
-		log.Printf("metrics available at '%s'", metricsPath)
-		if appSettings.BasicAuthProvider.Enabled() {
-			log.Printf("basic auth enabled")
-		}
-
-		svrErr := make(chan error)
-		go func() {
-			svrErr <- http.ListenAndServe(appSettings.MetricsAddress, nil)
-		}()
-		log.Print("ready")
-
-		err := <-svrErr
-		log.Fatal(err)
-	}
-}
-
-func handleGracefulShutdown() {
-	var signals = make(chan os.Signal)
-
-	signal.Notify(signals, syscall.SIGTERM)
-	signal.Notify(signals, syscall.SIGINT)
-
-	go func() {
-		sig := <-signals
-		log.Printf("caught signal: %+v", sig)
-		os.Exit(0)
-	}()
-}

go.mod

@@ -1,12 +1,27 @@
-module gitlab.com/hectorjsmith/fail2ban-prometheus-exporter
+module git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter
 
-go 1.15
+go 1.23.0
+
+toolchain go1.26.0
 
 require (
-	github.com/alecthomas/kingpin/v2 v2.3.2
+	github.com/alecthomas/kong v1.14.0
-	github.com/kisielk/og-rek v1.2.0
+	github.com/kisielk/og-rek v1.3.0
-	github.com/nlpodyssey/gopickle v0.2.0
+	github.com/nlpodyssey/gopickle v0.3.0
-	github.com/prometheus/client_golang v1.15.1
+	github.com/prometheus/client_golang v1.23.2
-	github.com/prometheus/common v0.44.0 // indirect
+)
-	github.com/prometheus/procfs v0.10.1 // indirect
+
+require (
+	github.com/aristanetworks/gomap v0.0.0-20240919214256-2b26376628e1 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/client_model v0.6.2 // indirect
+	github.com/prometheus/common v0.66.1 // indirect
+	github.com/prometheus/procfs v0.16.1 // indirect
+	go.yaml.in/yaml/v2 v2.4.2 // indirect
+	golang.org/x/sys v0.35.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
+	google.golang.org/protobuf v1.36.8 // indirect
 )

go.sum

@@ -1,555 +1,62 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/alecthomas/assert/v2 v2.11.0 h1:2Q9r3ki8+JYXvGsDyBXwH3LcJ+WK5D0gc5E8vS6K3D0=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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main.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/cfg"
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/collector/f2b"
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/collector/textfile"
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/server"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	version = "dev"
+	date    = "unknown"
+)
+
+func printAppVersion() {
+	fmt.Printf("Version:    %s\n", version)
+	fmt.Printf("Build date: %s\n", date)
+}
+
+func main() {
+	appSettings := cfg.Parse()
+	if appSettings.VersionMode {
+		printAppVersion()
+		return
+	}
+
+	handleGracefulShutdown()
+	log.Printf("fail2ban exporter version %s", version)
+	log.Printf("starting server at %s", appSettings.MetricsAddress)
+
+	f2bCollector := f2b.NewExporter(appSettings, version)
+	prometheus.MustRegister(f2bCollector)
+
+	textFileCollector := textfile.NewCollector(appSettings)
+	prometheus.MustRegister(textFileCollector)
+
+	if !appSettings.DryRunMode {
+		svrErr := server.StartServer(appSettings, textFileCollector)
+		err := <-svrErr
+		log.Fatal(err)
+	} else {
+		log.Print("running in dry-run mode - exiting")
+	}
+}
+
+func handleGracefulShutdown() {
+	var signals = make(chan os.Signal, 1)
+
+	signal.Notify(signals, syscall.SIGTERM)
+	signal.Notify(signals, syscall.SIGINT)
+
+	go func() {
+		sig := <-signals
+		log.Printf("caught signal: %+v", sig)
+		os.Exit(0)
+	}()
+}

renovate.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>volker.raschek/renovate-config:default#master",
+    "local>volker.raschek/renovate-config:container#master",
+    "local>volker.raschek/renovate-config:actions#master",
+    "local>volker.raschek/renovate-config:golang#master",
+    "local>volker.raschek/renovate-config:regexp#master"
+  ]
+}

server/auth.go

@@ -0,0 +1,17 @@
+package server
+
+import (
+	"net/http"
+
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/auth"
+)
+
+func AuthMiddleware(handlerFunc http.HandlerFunc, authProvider auth.AuthProvider) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if authProvider.IsAllowed(r) {
+			handlerFunc.ServeHTTP(w, r)
+		} else {
+			w.WriteHeader(http.StatusUnauthorized)
+		}
+	}
+}

server/auth_test.go

@@ -0,0 +1,46 @@
+package server
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+)
+
+type testAuthProvider struct {
+	match bool
+}
+
+func (p testAuthProvider) IsAllowed(request *http.Request) bool {
+	return p.match
+}
+
+func newTestRequest() *http.Request {
+	return httptest.NewRequest(http.MethodGet, "http://example.com", nil)
+}
+
+func executeAuthMiddlewareTest(t *testing.T, authMatches bool, expectedCode int, expectedCallCount int) {
+	callCount := 0
+	testHandler := func(w http.ResponseWriter, r *http.Request) {
+		callCount++
+	}
+
+	handler := AuthMiddleware(testHandler, testAuthProvider{match: authMatches})
+	recorder := httptest.NewRecorder()
+	request := newTestRequest()
+	handler.ServeHTTP(recorder, request)
+
+	if recorder.Code != expectedCode {
+		t.Errorf("statusCode = %v, want %v", recorder.Code, expectedCode)
+	}
+	if callCount != expectedCallCount {
+		t.Errorf("callCount = %v, want %v", callCount, expectedCallCount)
+	}
+}
+
+func Test_GIVEN_MatchingBasicAuth_WHEN_MethodCalled_THEN_RequestProcessed(t *testing.T) {
+	executeAuthMiddlewareTest(t, true, http.StatusOK, 1)
+}
+
+func Test_GIVEN_NonMatchingBasicAuth_WHEN_MethodCalled_THEN_RequestRejected(t *testing.T) {
+	executeAuthMiddlewareTest(t, false, http.StatusUnauthorized, 0)
+}

server/handler.go

@@ -0,0 +1,33 @@
+package server
+
+import (
+	"log"
+	"net/http"
+
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/collector/textfile"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+const (
+	metricsPath = "/metrics"
+)
+
+func rootHtmlHandler(w http.ResponseWriter, r *http.Request) {
+	_, err := w.Write([]byte(
+		`<html>
+			<head><title>Fail2Ban Exporter</title></head>
+			<body>
+			<h1>Fail2Ban Exporter</h1>
+			<p><a href="` + metricsPath + `">Metrics</a></p>
+			</body>
+		</html>`))
+	if err != nil {
+		log.Printf("error handling root url: %v", err)
+		w.WriteHeader(http.StatusInternalServerError)
+	}
+}
+
+func metricHandler(w http.ResponseWriter, r *http.Request, collector *textfile.Collector) {
+	promhttp.Handler().ServeHTTP(w, r)
+	collector.WriteTextFileMetrics(w, r)
+}

server/server.go

@@ -0,0 +1,41 @@
+package server
+
+import (
+	"log"
+	"net/http"
+	"time"
+
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/cfg"
+	"git.cryptic.systems/volker.raschek/prometheus-fail2ban-exporter/collector/textfile"
+)
+
+func StartServer(
+	appSettings *cfg.AppSettings,
+	textFileCollector *textfile.Collector,
+) chan error {
+	http.HandleFunc("/", AuthMiddleware(
+		rootHtmlHandler,
+		appSettings.AuthProvider,
+	))
+	http.HandleFunc(metricsPath, AuthMiddleware(
+		func(w http.ResponseWriter, r *http.Request) {
+			metricHandler(w, r, textFileCollector)
+		},
+		appSettings.AuthProvider,
+	))
+	log.Printf("metrics available at '%s'", metricsPath)
+
+	svrErr := make(chan error)
+	go func() {
+		httpServer := &http.Server{
+			Addr:              appSettings.MetricsAddress,
+			ReadHeaderTimeout: 10 * time.Second,
+			ReadTimeout:       10 * time.Second,
+			WriteTimeout:      10 * time.Second,
+			IdleTimeout:       30 * time.Second,
+		}
+		svrErr <- httpServer.ListenAndServe()
+	}()
+	log.Print("ready")
+	return svrErr
+}

socket/protocol.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
+
 	"github.com/nlpodyssey/gopickle/pickle"
 )
 
@@ -62,7 +63,7 @@ func (s *Fail2BanSocket) read() (interface{}, error) {
 		if (module == "builtins" || module == "__builtin__") && name == "str" {
 			return &Py_builtins_str{}, nil
 		}
-		return nil, fmt.Errorf("class not found: " + module + " : " + name)
+		return nil, fmt.Errorf("class not found: %s: %s", module, name)
 	}
 
 	return unpickler.Load()

systemd/systemd.service

@@ -0,0 +1,22 @@
+[Unit]
+Description=Prometheus exporter for fail2ban metrics
+Requires=network-online.target
+After=network-online.target
+
+[Service]
+EnvironmentFile=/etc/conf.d/EXECUTABLE
+ExecStart=/usr/bin/EXECUTABLE
+ExecReload=/bin/kill -HUP $MAINPID
+Restart=on-failure
+RestartSec=5s
+
+NoNewPrivileges=true
+
+# NOTE: Would be great to create and use a dedicated user/group via
+# sysusers.conf to access the fail2ban socket, but currently it is no possible
+# without manual configuration of the fail2ban daemon.
+User=root
+Group=root
+
+[Install]
+WantedBy=multi-user.target