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# Sample Function | ||
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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. | ||
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```go | ||
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// main.go | ||
package main | ||
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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" | ||
) | ||
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func handler(ctx context.Context, event events.S3ObjectLambdaEvent) (*s3.WriteGetObjectResponseOutput, error) { | ||
url := event.GetObjectContext.InputS3Url | ||
resp, err := http.Get(url) | ||
if err != nil { | ||
return nil, err | ||
} | ||
defer resp.Body.Close() | ||
bodyBytes, err := ioutil.ReadAll(resp.Body) | ||
if err != nil { | ||
return nil, err | ||
} | ||
transformedObject := TransformedObject{ | ||
Metadata: Metadata{ | ||
Length: len(bodyBytes), | ||
Md5: toMd5(bodyBytes), | ||
}, | ||
} | ||
jsonData, err := json.Marshal(transformedObject) | ||
if err != nil { | ||
return nil, err | ||
} | ||
cfg, err := config.LoadDefaultConfig(context.TODO()) | ||
if err != nil { | ||
return nil, err | ||
} | ||
svc := s3.NewFromConfig(cfg) | ||
input := &s3.WriteGetObjectResponseInput{ | ||
RequestRoute: &event.GetObjectContext.OutputRoute, | ||
RequestToken: &event.GetObjectContext.OutputToken, | ||
Body: strings.NewReader(string(jsonData)), | ||
} | ||
return svc.WriteGetObjectResponse(ctx, input) | ||
} | ||
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func toMd5(data []byte) string { | ||
hasher := md5.New() | ||
hasher.Write(data) | ||
hash := hasher.Sum(nil) | ||
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return hex.EncodeToString(hash) | ||
} | ||
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type TransformedObject struct { | ||
Metadata Metadata `json:"metadata"` | ||
} | ||
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type Metadata struct { | ||
Length int `json:"length"` | ||
Md5 string `json:"md5"` | ||
} | ||
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func main() { | ||
lambda.Start(handler) | ||
} | ||
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``` |
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package events | ||
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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 Configuration `json:"configuration"` | ||
UserRequest UserRequest `json:"userRequest"` | ||
UserIdentity UserIdentity `json:"userIdentity"` | ||
ProtocolVersion string `json:"protocolVersion"` | ||
} | ||
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type GetObjectContext struct { | ||
InputS3Url string `json:"inputS3Url"` | ||
OutputRoute string `json:"outputRoute"` | ||
OutputToken string `json:"outputToken"` | ||
} | ||
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type ListObjectsContext struct { | ||
InputS3Url string `json:"inputS3Url"` | ||
} | ||
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type ListObjectsV2Context struct { | ||
InputS3Url string `json:"inputS3Url"` | ||
} | ||
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type HeadObjectContext struct { | ||
InputS3Url string `json:"inputS3Url"` | ||
} | ||
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type Configuration struct { | ||
AccessPointArn string `json:"accessPointArn"` | ||
SupportingAccessPointArn string `json:"supportingAccessPointArn"` | ||
Payload string `json:"payload"` | ||
} | ||
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type UserRequest struct { | ||
Url string `json:"url"` | ||
Headers map[string]string `json:"headers"` | ||
} | ||
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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"` | ||
} | ||
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type SessionContext struct { | ||
Attributes map[string]string `json:"attributes"` | ||
SessionIssuer *SessionIssuer `json:"sessionIssuer,omitempty"` | ||
} | ||
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type SessionIssuer struct { | ||
Type string `json:"type"` | ||
PrincipalId string `json:"principalId"` | ||
Arn string `json:"arn"` | ||
AccountId string `json:"accountId"` | ||
UserName string `json:"userName"` | ||
} |
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package events | ||
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import ( | ||
"encoding/json" | ||
"testing" | ||
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"github.com/aws/aws-lambda-go/events/test" | ||
"github.com/stretchr/testify/assert" | ||
) | ||
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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"}, | ||
} | ||
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for _, tc := range tests { | ||
tc := tc | ||
t.Run(tc.file, func(t *testing.T) { | ||
inputJSON := test.ReadJSONFromFile(t, tc.file) | ||
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var inputEvent S3ObjectLambdaEvent | ||
if err := json.Unmarshal(inputJSON, &inputEvent); err != nil { | ||
t.Errorf("could not unmarshal event. details: %v", err) | ||
} | ||
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outputJSON, err := json.Marshal(inputEvent) | ||
if err != nil { | ||
t.Errorf("could not marshal event. details: %v", err) | ||
} | ||
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assert.JSONEq(t, string(inputJSON), string(outputJSON)) | ||
}) | ||
} | ||
} | ||
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func TestS3ObjectLambdaMarshalingMalformedJson(t *testing.T) { | ||
test.TestMalformedJson(t, S3ObjectLambdaEvent{}) | ||
} |
42 changes: 42 additions & 0 deletions
42
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" | ||
} |
29 changes: 29 additions & 0 deletions
29
events/testdata/s3-object-lambda-event-get-object-iam.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": "IAMUser", | ||
"principalId": "principalId", | ||
"arn": "arn:aws:iam::111122223333:user/username", | ||
"accountId": "111122223333", | ||
"accessKeyId": "accessKeyId" | ||
}, | ||
"protocolVersion": "1.00" | ||
} |
27 changes: 27 additions & 0 deletions
27
events/testdata/s3-object-lambda-event-head-object-iam.json
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{ | ||
"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" | ||
} |
27 changes: 27 additions & 0 deletions
27
events/testdata/s3-object-lambda-event-list-objects-iam.json
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{ | ||
"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" | ||
} |
27 changes: 27 additions & 0 deletions
27
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" | ||
} |