Bumps [github.com/hashicorp/terraform-plugin-sdk/v2](https://github.com/hashicorp/terraform-plugin-sdk) from 2.24.1 to 2.26.0. - [Release notes](https://github.com/hashicorp/terraform-plugin-sdk/releases) - [Changelog](https://github.com/hashicorp/terraform-plugin-sdk/blob/main/CHANGELOG.md) - [Commits](https://github.com/hashicorp/terraform-plugin-sdk/compare/v2.24.1...v2.26.0) --- updated-dependencies: - dependency-name: github.com/hashicorp/terraform-plugin-sdk/v2 dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>
147 lines
4.9 KiB
Go
147 lines
4.9 KiB
Go
package stdlib
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import (
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"bytes"
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"strings"
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"unicode/utf8"
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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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"github.com/zclconf/go-cty/cty/json"
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)
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var JSONEncodeFunc = function.New(&function.Spec{
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Description: `Returns a string containing a JSON representation of the given value.`,
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Params: []function.Parameter{
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{
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Name: "val",
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Type: cty.DynamicPseudoType,
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AllowUnknown: true,
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AllowDynamicType: true,
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AllowNull: true,
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},
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},
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Type: function.StaticReturnType(cty.String),
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RefineResult: refineNonNull,
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Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
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val := args[0]
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if !val.IsWhollyKnown() {
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// We can't serialize unknowns, so if the value is unknown or
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// contains any _nested_ unknowns then our result must be
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// unknown. However, we might still be able to at least constrain
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// the prefix of our string so that downstreams can sniff for
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// whether it's valid JSON and what result types it could have.
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valRng := val.Range()
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if valRng.CouldBeNull() {
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// If null is possible then we can't constrain the result
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// beyond the type constraint, because the very first character
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// of the string is what distinguishes a null.
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return cty.UnknownVal(retType), nil
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}
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b := cty.UnknownVal(retType).Refine()
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ty := valRng.TypeConstraint()
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switch {
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case ty == cty.String:
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b = b.StringPrefixFull(`"`)
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case ty.IsObjectType() || ty.IsMapType():
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b = b.StringPrefixFull("{")
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case ty.IsTupleType() || ty.IsListType() || ty.IsSetType():
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b = b.StringPrefixFull("[")
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}
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return b.NewValue(), nil
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}
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if val.IsNull() {
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return cty.StringVal("null"), nil
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}
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buf, err := json.Marshal(val, val.Type())
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if err != nil {
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return cty.NilVal, err
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}
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// json.Marshal should already produce a trimmed string, but we'll
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// make sure it always is because our unknown value refinements above
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// assume there will be no leading whitespace before the value.
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buf = bytes.TrimSpace(buf)
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return cty.StringVal(string(buf)), nil
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},
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})
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var JSONDecodeFunc = function.New(&function.Spec{
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Description: `Parses the given string as JSON and returns a value corresponding to what the JSON document describes.`,
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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: func(args []cty.Value) (cty.Type, error) {
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str := args[0]
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if !str.IsKnown() {
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// If the string isn't known then we can't fully parse it, but
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// if the value has been refined with a prefix then we may at
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// least be able to reject obviously-invalid syntax and maybe
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// even predict the result type. It's safe to return a specific
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// result type only if parsing a full document with this prefix
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// would return exactly that type or fail with a syntax error.
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rng := str.Range()
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if prefix := strings.TrimSpace(rng.StringPrefix()); prefix != "" {
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// If we know at least one character then it should be one
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// of the few characters that can introduce a JSON value.
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switch r, _ := utf8.DecodeRuneInString(prefix); r {
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case '{', '[':
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// These can start object values and array values
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// respectively, but we can't actually form a full
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// object type constraint or tuple type constraint
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// without knowing all of the attributes, so we
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// will still return DynamicPseudoType in this case.
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case '"':
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// This means that the result will either be a string
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// or parsing will fail.
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return cty.String, nil
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case 't', 'f':
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// Must either be a boolean value or a syntax error.
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return cty.Bool, nil
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case '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '.':
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// These characters would all start the "number" production.
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return cty.Number, nil
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case 'n':
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// n is valid to begin the keyword "null" but that doesn't
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// give us any extra type information.
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default:
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// No other characters are valid as the beginning of a
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// JSON value, so we can safely return an early error.
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return cty.NilType, function.NewArgErrorf(0, "a JSON document cannot begin with the character %q", r)
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}
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}
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return cty.DynamicPseudoType, nil
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}
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buf := []byte(str.AsString())
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return json.ImpliedType(buf)
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},
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Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
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buf := []byte(args[0].AsString())
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return json.Unmarshal(buf, retType)
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},
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})
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// JSONEncode returns a JSON serialization of the given value.
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func JSONEncode(val cty.Value) (cty.Value, error) {
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return JSONEncodeFunc.Call([]cty.Value{val})
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}
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// JSONDecode parses the given JSON string and, if it is valid, returns the
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// value it represents.
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//
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// Note that applying JSONDecode to the result of JSONEncode may not produce
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// an identically-typed result, since JSON encoding is lossy for cty Types.
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// The resulting value will consist only of primitive types, object types, and
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// tuple types.
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func JSONDecode(str cty.Value) (cty.Value, error) {
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return JSONDecodeFunc.Call([]cty.Value{str})
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}
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