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package encoding
import (
"encoding/base64"
"fmt"
"log"
"unicode/utf8"
"github.com/zclconf/go-cty/cty"
"github.com/zclconf/go-cty/cty/function"
)
// Base64DecodeFunc is a function that decodes a string containing a base64 sequence.
var Base64DecodeFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "str",
Type: cty.String,
},
},
Type: function.StaticReturnType(cty.String),
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
s := args[0].AsString()
sDec, err := base64.StdEncoding.DecodeString(s)
if err != nil {
return cty.UnknownVal(cty.String), fmt.Errorf("failed to decode base64 data '%s'", s)
}
if !utf8.Valid([]byte(sDec)) {
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
},
})
// Base64EncodeFunc is a function that encodes a string to a base64 sequence.
var Base64EncodeFunc = function.New(&function.Spec{
Params: []function.Parameter{
{
Name: "str",
Type: cty.String,
},
},
Type: function.StaticReturnType(cty.String),
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
return cty.StringVal(base64.StdEncoding.EncodeToString([]byte(args[0].AsString()))), nil
},
})
// Base64Decode decodes a string containing a base64 sequence.
//
// Terraform uses the "standard" Base64 alphabet as defined in RFC 4648 section 4.
//
// Strings in the Terraform language are sequences of unicode characters rather
// than bytes, so this function will also interpret the resulting bytes as
// UTF-8. If the bytes after Base64 decoding are _not_ valid UTF-8, this function
// produces an error.
func Base64Decode(str cty.Value) (cty.Value, error) {
return Base64DecodeFunc.Call([]cty.Value{str})
}
// Base64Encode applies Base64 encoding to a string.
//
// Terraform uses the "standard" Base64 alphabet as defined in RFC 4648 section 4.
//
// Strings in the Terraform language are sequences of unicode characters rather
// than bytes, so this function will first encode the characters from the string
// as UTF-8, and then apply Base64 encoding to the result.
func Base64Encode(str cty.Value) (cty.Value, error) {
return Base64EncodeFunc.Call([]cty.Value{str})
}
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