mirror of
https://github.com/hashicorp/packer.git
synced 2026-03-26 04:13:07 -04:00
da06110cc3
The filebase64 function aims to read and encode a file's contents into base64. This is mostly to support reading the content of a file that is not valid UTF-8, as is the case with the `file` function.
40 lines
999 B
Go
40 lines
999 B
Go
package function
|
|
|
|
import (
|
|
"encoding/base64"
|
|
"fmt"
|
|
"os"
|
|
"strings"
|
|
|
|
"github.com/zclconf/go-cty/cty"
|
|
"github.com/zclconf/go-cty/cty/function"
|
|
)
|
|
|
|
var Filebase64 = function.New(&function.Spec{
|
|
Params: []function.Parameter{
|
|
function.Parameter{
|
|
Name: "path",
|
|
Description: "Read a file and encode it as a base64 string",
|
|
Type: cty.String,
|
|
},
|
|
},
|
|
Type: function.StaticReturnType(cty.String),
|
|
RefineResult: refineNotNull,
|
|
Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
|
|
path := args[0].AsString()
|
|
content, err := os.ReadFile(path)
|
|
if err != nil {
|
|
return cty.NullVal(cty.String), fmt.Errorf("failed to read file %q: %s", path, err)
|
|
}
|
|
|
|
out := &strings.Builder{}
|
|
enc := base64.NewEncoder(base64.StdEncoding, out)
|
|
_, err = enc.Write(content)
|
|
if err != nil {
|
|
return cty.NullVal(cty.String), fmt.Errorf("failed to write file %q as base64: %s", path, err)
|
|
}
|
|
_ = enc.Close()
|
|
|
|
return cty.StringVal(out.String()), nil
|
|
},
|
|
})
|