pkg/util: Add fuzzer and ClusterfuzzLite

.clusterfuzzlite/Dockerfile

@@ -0,0 +1,5 @@
+FROM gcr.io/oss-fuzz-base/base-builder-go
+RUN git clone --depth 1 https://github.com/containrrr/shoutrrr
+COPY . $SRC/shoutrrr
+WORKDIR $SRC/shoutrrr
+COPY ./clusterfuzzlite/build.sh $SRC/

.clusterfuzzlite/build.sh

@@ -0,0 +1 @@
+compile_go_fuzzer github.com/containrrr/shoutrrr/pkg/util FuzzPartitionMessage fuzz_partition_message

.clusterfuzzlite/project.yaml

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+language: go

.github/workflows/cflite_pr.yml

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+name: ClusterFuzzLite PR fuzzing
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - '**'
+permissions: read-all
+jobs:
+  PR:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        sanitizer: [address]
+    steps:
+    - name: Build Fuzzers (${{ matrix.sanitizer }})
+      id: build
+      uses: google/clusterfuzzlite/actions/build_fuzzers@v1
+      with:
+        sanitizer: ${{ matrix.sanitizer }}
+        language: go
+    - name: Run Fuzzers (${{ matrix.sanitizer }})
+      id: run
+      uses: google/clusterfuzzlite/actions/run_fuzzers@v1
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        fuzz-seconds: 400
+        mode: 'code-change'
+        sanitizer: ${{ matrix.sanitizer }}

pkg/util/fuzz.go

@@ -0,0 +1,28 @@
+package util
+
+import (
+	fuzz "github.com/AdaLogics/go-fuzz-headers"
+	t "github.com/containrrr/shoutrrr/pkg/types"
+)
+
+func FuzzPartitionMessage(data []byte) int {
+	f := fuzz.NewConsumer(data)
+
+	input, err := f.GetString()
+	if err != nil {
+		return 0
+	}
+
+	limits := t.MessageLimit{}
+	err = f.GenerateStruct(&limits)
+	if err != nil {
+		return 0
+	}
+
+	distance, err := f.GetInt()
+	if err != nil {
+		return 0
+	}
+	_, _ = PartitionMessage(input, limits, distance)
+	return 1
+}