Add OTel collector processor for redact

otelprocessor/README.md

@@ -0,0 +1,32 @@
+# Redact Processor
+
+This is a processor made to use with the [OpenTelemetry Collector](https://opentelemetry.io/docs/collector/), that redacts sensitive information present in log bodies using [cockroachdb/redact](https://github.com/cockroachdb/redact).
+
+
+## Usage
+
+Follow the [guide to build a custom OpenTelemetry collector](https://opentelemetry.io/docs/collector/custom-collector/) which has this processor included in it.
+
+```yaml
+# builder-config.yaml
+
+# ...
+processors:
+  - gomod:
+      github.com/cockroachdb/redact/otelprocessor master
+# ...
+```
+
+And in the config for the collector:
+
+```yaml
+processors:
+  redact:
+
+service:
+  pipelines:
+    logs:
+      receivers: [...]
+      processors: [redact]
+      exporters: [...]
+```

otelprocessor/config.go

@@ -0,0 +1,10 @@
+package otelprocessor
+
+import "go.opentelemetry.io/collector/component"
+
+type Config struct {
+}
+
+func createDefaultConfig() component.Config {
+	return &Config{}
+}

otelprocessor/factory.go

@@ -0,0 +1,32 @@
+package otelprocessor
+
+import (
+	"context"
+
+	"github.com/cockroachdb/redact/otelprocessor/metadata"
+	"go.opentelemetry.io/collector/component"
+	"go.opentelemetry.io/collector/consumer"
+	"go.opentelemetry.io/collector/processor"
+	"go.opentelemetry.io/collector/processor/processorhelper"
+)
+
+func NewFactory() processor.Factory {
+	return processor.NewFactory(
+		metadata.Type,
+		createDefaultConfig,
+		processor.WithLogs(createLogsProcessor, metadata.LogsStability),
+	)
+}
+
+func createLogsProcessor(ctx context.Context, params processor.Settings, baseCfg component.Config, next consumer.Logs) (processor.Logs, error) {
+	cfg := baseCfg.(*Config)
+	redactProcessor := newRedactProcessor(ctx, cfg)
+	return processorhelper.NewLogs(
+		ctx,
+		params,
+		cfg,
+		next,
+		redactProcessor.processLogs,
+		processorhelper.WithCapabilities(consumer.Capabilities{MutatesData: true}),
+	)
+}

otelprocessor/go.mod

@@ -0,0 +1,47 @@
+module github.com/cockroachdb/redact/otelprocessor
+
+go 1.23.11
+
+require (
+	github.com/cockroachdb/redact v1.1.6
+	github.com/stretchr/testify v1.10.0
+	go.opentelemetry.io/collector/component v1.34.0
+	go.opentelemetry.io/collector/consumer v1.34.0
+	go.opentelemetry.io/collector/pdata v1.34.0
+	go.opentelemetry.io/collector/processor v1.34.0
+	go.opentelemetry.io/collector/processor/processorhelper v0.128.0
+)
+
+replace github.com/cockroachdb/redact => ../
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/hashicorp/go-version v1.7.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/collector/featuregate v1.34.0 // indirect
+	go.opentelemetry.io/collector/internal/telemetry v0.128.0 // indirect
+	go.opentelemetry.io/collector/pipeline v0.128.0 // indirect
+	go.opentelemetry.io/contrib/bridges/otelzap v0.11.0 // indirect
+	go.opentelemetry.io/otel v1.36.0 // indirect
+	go.opentelemetry.io/otel/log v0.12.2 // indirect
+	go.opentelemetry.io/otel/metric v1.36.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.36.0 // indirect
+	go.opentelemetry.io/otel/trace v1.36.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
+	golang.org/x/net v0.39.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.24.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20250218202821-56aae31c358a // indirect
+	google.golang.org/grpc v1.72.2 // indirect
+	google.golang.org/protobuf v1.36.6 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

otelprocessor/go.sum

@@ -0,0 +1,140 @@
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otelprocessor/metadata/status.go

@@ -0,0 +1,7 @@
+package metadata
+
+import "go.opentelemetry.io/collector/component"
+
+var Type = component.MustNewType("redact")
+
+const LogsStability = component.StabilityLevelAlpha

otelprocessor/processor.go

@@ -0,0 +1,47 @@
+package otelprocessor
+
+import (
+	"context"
+
+	"github.com/cockroachdb/redact"
+	"go.opentelemetry.io/collector/pdata/pcommon"
+	"go.opentelemetry.io/collector/pdata/plog"
+)
+
+type redactProcessor struct {
+	config Config
+}
+
+func newRedactProcessor(_ context.Context, config *Config) *redactProcessor {
+	rp := &redactProcessor{
+		config: *config,
+	}
+
+	return rp
+}
+
+func (rp *redactProcessor) processLogs(_ context.Context, logs plog.Logs) (plog.Logs, error) {
+	resourceLogs := logs.ResourceLogs()
+	for i := 0; i < resourceLogs.Len(); i++ {
+		rp.processResourceLog(resourceLogs.At(i))
+	}
+
+	return logs, nil
+}
+
+func (rp *redactProcessor) processResourceLog(rl plog.ResourceLogs) {
+	for i := 0; i < rl.ScopeLogs().Len(); i++ {
+		ils := rl.ScopeLogs().At(i)
+		for j := 0; j < ils.LogRecords().Len(); j++ {
+			log := ils.LogRecords().At(j)
+			rp.processLogBody(log.Body())
+		}
+	}
+}
+
+func (rp *redactProcessor) processLogBody(body pcommon.Value) {
+	if body.Type() == pcommon.ValueTypeStr {
+		red := redact.RedactableString(body.AsString())
+		body.SetStr(string(red.Redact()))
+	}
+}

otelprocessor/processor_test.go

@@ -0,0 +1,36 @@
+package otelprocessor
+
+import (
+	"context"
+	"testing"
+
+	"github.com/cockroachdb/redact"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.opentelemetry.io/collector/pdata/plog"
+)
+
+type TestConfig struct {
+	config *Config
+}
+
+func TestLogBody(t *testing.T) {
+	inBatch := plog.NewLogs()
+	rl := inBatch.ResourceLogs().AppendEmpty()
+	ils := rl.ScopeLogs().AppendEmpty()
+	library := ils.Scope()
+	library.SetName("first-library")
+
+	logEntry := ils.LogRecords().AppendEmpty()
+
+	body := redact.Sprintf("hello %s", "world")
+	logEntry.Body().SetStr(string(body))
+
+	ctx := context.Background()
+	processor := newRedactProcessor(ctx, &Config{})
+	outBatch, err := processor.processLogs(ctx, inBatch)
+	assert.NoError(t, err)
+	outLogBody := outBatch.ResourceLogs().At(0).ScopeLogs().At(0).LogRecords().At(0).Body().Str()
+
+	require.Equal(t, string(body.Redact()), outLogBody)
+}