Modify parsing functions and config structs to accept hcl changes

Signed-off-by: Patrick Van Stee <patrick@vanstee.me>

vendor/github.com/zclconf/go-cty/cty/function/stdlib/json.go

@@ -0,0 +1,72 @@
+package stdlib
+
+import (
+	"github.com/zclconf/go-cty/cty"
+	"github.com/zclconf/go-cty/cty/function"
+	"github.com/zclconf/go-cty/cty/json"
+)
+
+var JSONEncodeFunc = function.New(&function.Spec{
+	Params: []function.Parameter{
+		{
+			Name:             "val",
+			Type:             cty.DynamicPseudoType,
+			AllowDynamicType: true,
+		},
+	},
+	Type: function.StaticReturnType(cty.String),
+	Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
+		val := args[0]
+		if !val.IsWhollyKnown() {
+			// We can't serialize unknowns, so if the value is unknown or
+			// contains any _nested_ unknowns then our result must be
+			// unknown.
+			return cty.UnknownVal(retType), nil
+		}
+
+		buf, err := json.Marshal(val, val.Type())
+		if err != nil {
+			return cty.NilVal, err
+		}
+
+		return cty.StringVal(string(buf)), nil
+	},
+})
+
+var JSONDecodeFunc = function.New(&function.Spec{
+	Params: []function.Parameter{
+		{
+			Name: "str",
+			Type: cty.String,
+		},
+	},
+	Type: func(args []cty.Value) (cty.Type, error) {
+		str := args[0]
+		if !str.IsKnown() {
+			return cty.DynamicPseudoType, nil
+		}
+
+		buf := []byte(str.AsString())
+		return json.ImpliedType(buf)
+	},
+	Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
+		buf := []byte(args[0].AsString())
+		return json.Unmarshal(buf, retType)
+	},
+})
+
+// JSONEncode returns a JSON serialization of the given value.
+func JSONEncode(val cty.Value) (cty.Value, error) {
+	return JSONEncodeFunc.Call([]cty.Value{val})
+}
+
+// JSONDecode parses the given JSON string and, if it is valid, returns the
+// value it represents.
+//
+// Note that applying JSONDecode to the result of JSONEncode may not produce
+// an identically-typed result, since JSON encoding is lossy for cty Types.
+// The resulting value will consist only of primitive types, object types, and
+// tuple types.
+func JSONDecode(str cty.Value) (cty.Value, error) {
+	return JSONDecodeFunc.Call([]cty.Value{str})
+}