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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| # 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) 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 | ||
| } | ||
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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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