43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
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package funcs
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import (
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"encoding/base64"
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"fmt"
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"github.com/zclconf/go-cty/cty"
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"github.com/zclconf/go-cty/cty/function"
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)
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// Base64DecodeFunc constructs a function that decodes a string containing a base64 sequence.
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var Base64DecodeFunc = function.New(&function.Spec{
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Params: []function.Parameter{
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{
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Name: "str",
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Type: cty.String,
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},
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},
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Type: function.StaticReturnType(cty.String),
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Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
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s := args[0].AsString()
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sDec, err := base64.StdEncoding.DecodeString(s)
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if err != nil {
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return cty.UnknownVal(cty.String), fmt.Errorf("failed to decode base64 data '%s'", s)
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}
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return cty.StringVal(string(sDec)), nil
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},
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})
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// Base64Decode decodes a string containing a base64 sequence.
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//
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// Terraform uses the "standard" Base64 alphabet as defined in
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// [RFC 4648 section 4](https://tools.ietf.org/html/rfc4648#section-4).
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//
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// Strings in the Terraform language are sequences of unicode characters rather
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// than bytes, so this function will also interpret the resulting bytes as
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// UTF-8. If the bytes after Base64 decoding are _not_ valid UTF-8, this function
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// produces an error.
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func Base64Decode(str cty.Value) (cty.Value, error) {
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return Base64DecodeFunc.Call([]cty.Value{str})
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}
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