Add S3ObjectLambdaEvent

events/README_S3_Object_Lambda.md

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+# Sample Function
+
+The following is a sample class and Lambda function that receives Amazon S3 Object Lambda event record data as an input and returns an object metadata output.
+
+```go
+
+// main.go
+package main
+
+import (
+	"context"
+	"crypto/md5"
+	"encoding/hex"
+	"encoding/json"
+	"io/ioutil"
+	"net/http"
+	"github.com/aws/aws-lambda-go/lambda"
+	"github.com/aws/aws-lambda-go/events"
+	"github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+)
+
+func handler(ctx context.Context, event events.S3ObjectLambdaEvent) error {
+	url := event.GetObjectContext.InputS3Url
+	resp, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	bodyBytes, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return err
+	}
+	transformedObject := TransformedObject{
+		Metadata: Metadata{
+			Length: len(bodyBytes),
+			Md5:    toMd5(bodyBytes),
+		},
+	}
+	jsonData, err := json.Marshal(transformedObject)
+	if err != nil {
+		return err
+	}
+	cfg, err := config.LoadDefaultConfig(context.TODO())
+	if err != nil {
+		return err
+	}
+	svc := s3.NewFromConfig(cfg)
+	input := &s3.WriteGetObjectResponseInput{
+		RequestRoute: &event.GetObjectContext.OutputRoute,
+		RequestToken: &event.GetObjectContext.OutputToken,
+		Body:         strings.NewReader(string(jsonData)),
+	}
+	res, err := svc.WriteGetObjectResponse(ctx, input)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("%v", res)
+	return nil
+}
+
+func toMd5(data []byte) string {
+	hasher := md5.New()
+	hasher.Write(data)
+	hash := hasher.Sum(nil)
+
+	return hex.EncodeToString(hash)
+}
+
+type TransformedObject struct {
+	Metadata Metadata `json:"metadata"`
+}
+
+type Metadata struct {
+	Length int    `json:"length"`
+	Md5    string `json:"md5"`
+}
+
+func main() {
+	lambda.Start(handler)
+}
+
+```

events/s3_object_lambda.go

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+package events
+
+type S3ObjectLambdaEvent struct {
+	XAmzRequestID        string                      `json:"xAmzRequestId"`
+	GetObjectContext     *GetObjectContext           `json:"getObjectContext,omitempty"`
+	ListObjectsContext   *ListObjectsContext         `json:"listObjectsContext,omitempty"`
+	ListObjectsV2Context *ListObjectsV2Context       `json:"listObjectsV2Context,omitempty"`
+	HeadObjectContext    *HeadObjectContext          `json:"headObjectContext,omitempty"`
+	Configuration        S3ObjectLambdaConfiguration `json:"configuration"`
+	UserRequest          UserRequest                 `json:"userRequest"`
+	UserIdentity         UserIdentity                `json:"userIdentity"`
+	ProtocolVersion      string                      `json:"protocolVersion"`
+}
+
+type GetObjectContext struct {
+	InputS3Url  string `json:"inputS3Url"`
+	OutputRoute string `json:"outputRoute"`
+	OutputToken string `json:"outputToken"`
+}
+
+type ListObjectsContext struct {
+	InputS3Url string `json:"inputS3Url"`
+}
+
+type ListObjectsV2Context struct {
+	InputS3Url string `json:"inputS3Url"`
+}
+
+type HeadObjectContext struct {
+	InputS3Url string `json:"inputS3Url"`
+}
+
+type S3ObjectLambdaConfiguration struct {
+	AccessPointARN           string `json:"accessPointArn"`
+	SupportingAccessPointARN string `json:"supportingAccessPointArn"`
+	Payload                  string `json:"payload"`
+}
+
+type UserRequest struct {
+	URL     string            `json:"url"`
+	Headers map[string]string `json:"headers"`
+}
+
+type UserIdentity struct {
+	Type           string          `json:"type"`
+	PrincipalID    string          `json:"principalId"`
+	ARN            string          `json:"arn"`
+	AccountID      string          `json:"accountId"`
+	AccessKeyID    string          `json:"accessKeyId"`
+	SessionContext *SessionContext `json:"sessionContext,omitempty"`
+}
+
+type SessionContext struct {
+	Attributes    map[string]string `json:"attributes"`
+	SessionIssuer *SessionIssuer    `json:"sessionIssuer,omitempty"`
+}
+
+type SessionIssuer struct {
+	Type        string `json:"type"`
+	PrincipalID string `json:"principalId"`
+	ARN         string `json:"arn"`
+	AccountID   string `json:"accountId"`
+	UserName    string `json:"userName"`
+}

events/s3_object_lambda_test.go

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+package events
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/aws/aws-lambda-go/events/test"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestS3ObjectLambdaEventMarshaling(t *testing.T) {
+	tests := []struct {
+		file string
+	}{
+		{"./testdata/s3-object-lambda-event-get-object-iam.json"},
+		{"./testdata/s3-object-lambda-event-get-object-assumed-role.json"},
+		{"./testdata/s3-object-lambda-event-head-object-iam.json"},
+		{"./testdata/s3-object-lambda-event-list-objects-iam.json"},
+		{"./testdata/s3-object-lambda-event-list-objects-v2-iam.json"},
+	}
+
+	for _, tc := range tests {
+		tc := tc
+		t.Run(tc.file, func(t *testing.T) {
+			inputJSON := test.ReadJSONFromFile(t, tc.file)
+
+			var inputEvent S3ObjectLambdaEvent
+			if err := json.Unmarshal(inputJSON, &inputEvent); err != nil {
+				t.Errorf("could not unmarshal event. details: %v", err)
+			}
+
+			outputJSON, err := json.Marshal(inputEvent)
+			if err != nil {
+				t.Errorf("could not marshal event. details: %v", err)
+			}
+
+			assert.JSONEq(t, string(inputJSON), string(outputJSON))
+		})
+	}
+}
+
+func TestS3ObjectLambdaMarshalingMalformedJson(t *testing.T) {
+	test.TestMalformedJson(t, S3ObjectLambdaEvent{})
+}

events/testdata/s3-object-lambda-event-get-object-assumed-role.json

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+{
+    "xAmzRequestId": "requestId",
+    "getObjectContext": {
+        "inputS3Url": "https://my-s3-ap-111122223333.s3-accesspoint.us-east-1.amazonaws.com/example?X-Amz-Security-Token=<snip>",
+        "outputRoute": "io-use1-001",
+        "outputToken": "OutputToken"
+    },
+    "configuration": {
+        "accessPointArn": "arn:aws:s3-object-lambda:us-east-1:111122223333:accesspoint/example-object-lambda-ap",
+        "supportingAccessPointArn": "arn:aws:s3:us-east-1:111122223333:accesspoint/example-ap",
+        "payload": "{}"
+    },
+    "userRequest": {
+        "url": "https://object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com/example",
+        "headers": {
+            "Host": "object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com",
+            "Accept-Encoding": "identity",
+            "X-Amz-Content-SHA256": "e3b0c44298fc1example"
+        }
+    },
+    "userIdentity": {
+        "type": "AssumedRole",
+        "principalId": "principalId",
+        "arn": "arn:aws:sts::111122223333:assumed-role/Admin/example",
+        "accountId": "111122223333",
+        "accessKeyId": "accessKeyId",
+        "sessionContext": {
+            "attributes": {
+                "mfaAuthenticated": "false",
+                "creationDate": "Wed Mar 10 23:41:52 UTC 2021"
+            },
+            "sessionIssuer": {
+                "type": "Role",
+                "principalId": "principalId",
+                "arn": "arn:aws:iam::111122223333:role/Admin",
+                "accountId": "111122223333",
+                "userName": "Admin"
+            }
+        }
+    },
+    "protocolVersion": "1.00"
+}

events/testdata/s3-object-lambda-event-get-object-iam.json

@@ -0,0 +1,29 @@
+{
+  "xAmzRequestId": "requestId",
+  "getObjectContext": {
+      "inputS3Url": "https://my-s3-ap-111122223333.s3-accesspoint.us-east-1.amazonaws.com/example?X-Amz-Security-Token=<snip>",
+      "outputRoute": "io-use1-001",
+      "outputToken": "OutputToken"
+  },
+  "configuration": {
+      "accessPointArn": "arn:aws:s3-object-lambda:us-east-1:111122223333:accesspoint/example-object-lambda-ap",
+      "supportingAccessPointArn": "arn:aws:s3:us-east-1:111122223333:accesspoint/example-ap",
+      "payload": "{}"
+  },
+  "userRequest": {
+      "url": "https://object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com/example",
+      "headers": {
+          "Host": "object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com",
+          "Accept-Encoding": "identity",
+          "X-Amz-Content-SHA256": "e3b0c44298fc1example"
+      }
+  },
+  "userIdentity": {
+      "type": "IAMUser",
+      "principalId": "principalId",
+      "arn": "arn:aws:iam::111122223333:user/username",
+      "accountId": "111122223333",
+      "accessKeyId": "accessKeyId"
+  },
+  "protocolVersion": "1.00"
+}

events/testdata/s3-object-lambda-event-head-object-iam.json

@@ -0,0 +1,27 @@
+{
+    "xAmzRequestId": "requestId",
+    "headObjectContext": {
+        "inputS3Url": "https://my-s3-ap-111122223333.s3-accesspoint.us-east-1.amazonaws.com/example?X-Amz-Security-Token=<snip>"
+    },
+    "configuration": {
+        "accessPointArn": "arn:aws:s3-object-lambda:us-east-1:111122223333:accesspoint/example-object-lambda-ap",
+        "supportingAccessPointArn": "arn:aws:s3:us-east-1:111122223333:accesspoint/example-ap",
+        "payload": "{}"
+    },
+    "userRequest": {
+        "url": "https://object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com/example",
+        "headers": {
+            "Host": "object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com",
+            "Accept-Encoding": "identity",
+            "X-Amz-Content-SHA256": "e3b0c44298fc1example"
+        }
+    },
+    "userIdentity": {
+        "type": "IAMUser",
+        "principalId": "principalId",
+        "arn": "arn:aws:iam::111122223333:user/username",
+        "accountId": "111122223333",
+        "accessKeyId": "accessKeyId"
+    },
+    "protocolVersion": "1.01"
+}

events/testdata/s3-object-lambda-event-list-objects-iam.json

@@ -0,0 +1,27 @@
+{
+    "xAmzRequestId": "requestId",
+    "listObjectsContext": {
+        "inputS3Url": "https://my-s3-ap-111122223333.s3-accesspoint.us-east-1.amazonaws.com/example?X-Amz-Security-Token=<snip>"
+    },
+    "configuration": {
+        "accessPointArn": "arn:aws:s3-object-lambda:us-east-1:111122223333:accesspoint/example-object-lambda-ap",
+        "supportingAccessPointArn": "arn:aws:s3:us-east-1:111122223333:accesspoint/example-ap",
+        "payload": "{}"
+    },
+    "userRequest": {
+        "url": "https://object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com/example",
+        "headers": {
+            "Host": "object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com",
+            "Accept-Encoding": "identity",
+            "X-Amz-Content-SHA256": "e3b0c44298fc1example"
+        }
+    },
+    "userIdentity": {
+        "type": "IAMUser",
+        "principalId": "principalId",
+        "arn": "arn:aws:iam::111122223333:user/username",
+        "accountId": "111122223333",
+        "accessKeyId": "accessKeyId"
+    },
+    "protocolVersion": "1.01"
+}

events/testdata/s3-object-lambda-event-list-objects-v2-iam.json

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+{
+    "xAmzRequestId": "requestId",
+    "listObjectsV2Context": {
+        "inputS3Url": "https://my-s3-ap-111122223333.s3-accesspoint.us-east-1.amazonaws.com/example?X-Amz-Security-Token=<snip>"
+    },
+    "configuration": {
+        "accessPointArn": "arn:aws:s3-object-lambda:us-east-1:111122223333:accesspoint/example-object-lambda-ap",
+        "supportingAccessPointArn": "arn:aws:s3:us-east-1:111122223333:accesspoint/example-ap",
+        "payload": "{}"
+    },
+    "userRequest": {
+        "url": "https://object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com/example",
+        "headers": {
+            "Host": "object-lambda-111122223333.s3-object-lambda.us-east-1.amazonaws.com",
+            "Accept-Encoding": "identity",
+            "X-Amz-Content-SHA256": "e3b0c44298fc1example"
+        }
+    },
+    "userIdentity": {
+        "type": "IAMUser",
+        "principalId": "principalId",
+        "arn": "arn:aws:iam::111122223333:user/username",
+        "accountId": "111122223333",
+        "accessKeyId": "accessKeyId"
+    },
+    "protocolVersion": "1.01"
+}