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base64decode: check that the decoded (not encoded) string is valid UTF-8

This commit is contained in:
Kristin Laemmert 2018-05-24 11:48:44 -07:00 committed by Martin Atkins
parent 6171ba3b8a
commit 74f2d58b8b
1 changed files with 4 additions and 2 deletions
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6
lang/funcs/encoding.go
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@ -5,6 +5,7 @@ import (
"compress/gzip" "compress/gzip"
"encoding/base64" "encoding/base64"
"fmt" "fmt"
"log"
"net/url" "net/url"
"unicode/utf8" "unicode/utf8"
@ -27,8 +28,9 @@ var Base64DecodeFunc = function.New(&function.Spec{
if err != nil { if err != nil {
return cty.UnknownVal(cty.String), fmt.Errorf("failed to decode base64 data '%s'", s) return cty.UnknownVal(cty.String), fmt.Errorf("failed to decode base64 data '%s'", s)
} }
if !utf8.Valid([]byte(s)) { if !utf8.Valid([]byte(sDec)) {
return cty.UnknownVal(cty.String), fmt.Errorf("contents of '%s' are not valid UTF-8", s) log.Printf("[DEBUG] the result of decoding the the provided string is not valid UTF-8: %s", sDec)
return cty.UnknownVal(cty.String), fmt.Errorf("the result of decoding the the provided string is not valid UTF-8")
} }
return cty.StringVal(string(sDec)), nil return cty.StringVal(string(sDec)), nil
}, },