116 lines
2.8 KiB
Go
116 lines
2.8 KiB
Go
package sqs
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import (
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"crypto/md5"
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"encoding/hex"
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"fmt"
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"strings"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/aws/awserr"
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"github.com/aws/aws-sdk-go/aws/request"
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)
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var (
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errChecksumMissingBody = fmt.Errorf("cannot compute checksum. missing body")
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errChecksumMissingMD5 = fmt.Errorf("cannot verify checksum. missing response MD5")
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)
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func setupChecksumValidation(r *request.Request) {
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if aws.BoolValue(r.Config.DisableComputeChecksums) {
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return
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}
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switch r.Operation.Name {
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case opSendMessage:
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r.Handlers.Unmarshal.PushBack(verifySendMessage)
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case opSendMessageBatch:
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r.Handlers.Unmarshal.PushBack(verifySendMessageBatch)
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case opReceiveMessage:
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r.Handlers.Unmarshal.PushBack(verifyReceiveMessage)
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}
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}
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func verifySendMessage(r *request.Request) {
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if r.DataFilled() && r.ParamsFilled() {
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in := r.Params.(*SendMessageInput)
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out := r.Data.(*SendMessageOutput)
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err := checksumsMatch(in.MessageBody, out.MD5OfMessageBody)
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if err != nil {
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setChecksumError(r, err.Error())
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}
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}
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}
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func verifySendMessageBatch(r *request.Request) {
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if r.DataFilled() && r.ParamsFilled() {
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entries := map[string]*SendMessageBatchResultEntry{}
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ids := []string{}
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out := r.Data.(*SendMessageBatchOutput)
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for _, entry := range out.Successful {
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entries[*entry.Id] = entry
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}
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in := r.Params.(*SendMessageBatchInput)
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for _, entry := range in.Entries {
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if e := entries[*entry.Id]; e != nil {
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err := checksumsMatch(entry.MessageBody, e.MD5OfMessageBody)
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if err != nil {
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ids = append(ids, *e.MessageId)
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}
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}
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}
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if len(ids) > 0 {
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setChecksumError(r, "invalid messages: %s", strings.Join(ids, ", "))
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}
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}
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}
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func verifyReceiveMessage(r *request.Request) {
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if r.DataFilled() && r.ParamsFilled() {
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ids := []string{}
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out := r.Data.(*ReceiveMessageOutput)
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for i, msg := range out.Messages {
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err := checksumsMatch(msg.Body, msg.MD5OfBody)
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if err != nil {
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if msg.MessageId == nil {
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if r.Config.Logger != nil {
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r.Config.Logger.Log(fmt.Sprintf(
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"WARN: SQS.ReceiveMessage failed checksum request id: %s, message %d has no message ID.",
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r.RequestID, i,
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))
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}
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continue
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}
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ids = append(ids, *msg.MessageId)
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}
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}
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if len(ids) > 0 {
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setChecksumError(r, "invalid messages: %s", strings.Join(ids, ", "))
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}
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}
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}
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func checksumsMatch(body, expectedMD5 *string) error {
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if body == nil {
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return errChecksumMissingBody
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} else if expectedMD5 == nil {
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return errChecksumMissingMD5
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}
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msum := md5.Sum([]byte(*body))
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sum := hex.EncodeToString(msum[:])
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if sum != *expectedMD5 {
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return fmt.Errorf("expected MD5 checksum '%s', got '%s'", *expectedMD5, sum)
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}
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return nil
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}
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func setChecksumError(r *request.Request, format string, args ...interface{}) {
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r.Retryable = aws.Bool(true)
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r.Error = awserr.New("InvalidChecksum", fmt.Sprintf(format, args...), nil)
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}
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