vendor: github.com/mitchellh/mapstructure v1.5.0

note that this repository will be sunset, and the "endorsed" fork will be
maintened by "go-viper"; see [mapstructure#349][1]

[1]: https://github.com/mitchellh/mapstructure/issues/349

full diff: https://github.com/mitchellh/mapstructure/compare/v1.3.2...v1.5.0

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor.mod

@@ -21,7 +21,7 @@ require (
 	github.com/google/go-cmp v0.5.9
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
 	github.com/mattn/go-runewidth v0.0.15
-	github.com/mitchellh/mapstructure v1.3.2
+	github.com/mitchellh/mapstructure v1.5.0
 	github.com/moby/patternmatcher v0.6.0
 	github.com/moby/swarmkit/v2 v2.0.0-20230911190601-f082dd7a0cee
 	github.com/moby/sys/sequential v0.5.0

vendor.sum

@@ -162,8 +162,8 @@ github.com/miekg/pkcs11 v1.0.3/go.mod h1:XsNlhZGX73bx86s2hdc/FuaLm2CPZJemRLMA+WT
 github.com/miekg/pkcs11 v1.1.1 h1:Ugu9pdy6vAYku5DEpVWVFPYnzV+bxB+iRdbuFSu7TvU=
 github.com/miekg/pkcs11 v1.1.1/go.mod h1:XsNlhZGX73bx86s2hdc/FuaLm2CPZJemRLMA+WTFxgs=
 github.com/mitchellh/mapstructure v1.0.0/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
-github.com/mitchellh/mapstructure v1.3.2 h1:mRS76wmkOn3KkKAyXDu42V+6ebnXWIztFSYGN7GeoRg=
+github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
-github.com/mitchellh/mapstructure v1.3.2/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
 github.com/moby/patternmatcher v0.6.0 h1:GmP9lR19aU5GqSSFko+5pRqHi+Ohk1O69aFiKkVGiPk=
 github.com/moby/patternmatcher v0.6.0/go.mod h1:hDPoyOpDY7OrrMDLaYoY3hf52gNCR/YOUYxkhApJIxc=
 github.com/moby/swarmkit/v2 v2.0.0-20230911190601-f082dd7a0cee h1:T7Mz81wbNduphN0195OfYadKSs/uQKr4zrKtsCSfQTc=

vendor/github.com/mitchellh/mapstructure/.travis.yml

@@ -1,9 +0,0 @@
-language: go
-
-go:
-  - "1.14.x"
-  - tip
-
-script:
-  - go test
-  - go test -bench . -benchmem

vendor/github.com/mitchellh/mapstructure/CHANGELOG.md

@@ -1,3 +1,42 @@
+## 1.5.0
+
+* New option `IgnoreUntaggedFields` to ignore decoding to any fields
+  without `mapstructure` (or the configured tag name) set [GH-277]
+* New option `ErrorUnset` which makes it an error if any fields
+  in a target struct are not set by the decoding process. [GH-225]
+* New function `OrComposeDecodeHookFunc` to help compose decode hooks. [GH-240]
+* Decoding to slice from array no longer crashes [GH-265]
+* Decode nested struct pointers to map [GH-271]
+* Fix issue where `,squash` was ignored if `Squash` option was set. [GH-280]
+* Fix issue where fields with `,omitempty` would sometimes decode
+  into a map with an empty string key [GH-281]
+
+## 1.4.3
+
+* Fix cases where `json.Number` didn't decode properly [GH-261]
+
+## 1.4.2
+
+* Custom name matchers to support any sort of casing, formatting, etc. for
+  field names. [GH-250]
+* Fix possible panic in ComposeDecodeHookFunc [GH-251]
+
+## 1.4.1
+
+* Fix regression where `*time.Time` value would be set to empty and not be sent
+  to decode hooks properly [GH-232]
+
+## 1.4.0
+
+* A new decode hook type `DecodeHookFuncValue` has been added that has
+  access to the full values. [GH-183]
+* Squash is now supported with embedded fields that are struct pointers [GH-205]
+* Empty strings will convert to 0 for all numeric types when weakly decoding [GH-206]
+
+## 1.3.3
+
+* Decoding maps from maps creates a settable value for decode hooks [GH-203]
+
 ## 1.3.2
 
 * Decode into interface type with a struct value is supported [GH-187]

vendor/github.com/mitchellh/mapstructure/decode_hooks.go

@@ -1,6 +1,7 @@
 package mapstructure
 
 import (
+	"encoding"
 	"errors"
 	"fmt"
 	"net"
@@ -16,10 +17,11 @@ func typedDecodeHook(h DecodeHookFunc) DecodeHookFunc {
 	// Create variables here so we can reference them with the reflect pkg
 	var f1 DecodeHookFuncType
 	var f2 DecodeHookFuncKind
+	var f3 DecodeHookFuncValue
 
 	// Fill in the variables into this interface and the rest is done
 	// automatically using the reflect package.
-	potential := []interface{}{f1, f2}
+	potential := []interface{}{f1, f2, f3}
 
 	v := reflect.ValueOf(h)
 	vt := v.Type()
@@ -38,13 +40,15 @@ func typedDecodeHook(h DecodeHookFunc) DecodeHookFunc {
 // that took reflect.Kind instead of reflect.Type.
 func DecodeHookExec(
 	raw DecodeHookFunc,
-	from reflect.Type, to reflect.Type,
+	from reflect.Value, to reflect.Value) (interface{}, error) {
-	data interface{}) (interface{}, error) {
+
 	switch f := typedDecodeHook(raw).(type) {
 	case DecodeHookFuncType:
-		return f(from, to, data)
+		return f(from.Type(), to.Type(), from.Interface())
 	case DecodeHookFuncKind:
-		return f(from.Kind(), to.Kind(), data)
+		return f(from.Kind(), to.Kind(), from.Interface())
+	case DecodeHookFuncValue:
+		return f(from, to)
 	default:
 		return nil, errors.New("invalid decode hook signature")
 	}
@@ -56,28 +60,45 @@ func DecodeHookExec(
 // The composed funcs are called in order, with the result of the
 // previous transformation.
 func ComposeDecodeHookFunc(fs ...DecodeHookFunc) DecodeHookFunc {
-	return func(
+	return func(f reflect.Value, t reflect.Value) (interface{}, error) {
-		f reflect.Type,
-		t reflect.Type,
-		data interface{}) (interface{}, error) {
 		var err error
+		data := f.Interface()
+
+		newFrom := f
 		for _, f1 := range fs {
-			data, err = DecodeHookExec(f1, f, t, data)
+			data, err = DecodeHookExec(f1, newFrom, t)
 			if err != nil {
 				return nil, err
 			}
-
+			newFrom = reflect.ValueOf(data)
-			// Modify the from kind to be correct with the new data
-			f = nil
-			if val := reflect.ValueOf(data); val.IsValid() {
-				f = val.Type()
-			}
 		}
 
 		return data, nil
 	}
 }
 
+// OrComposeDecodeHookFunc executes all input hook functions until one of them returns no error. In that case its value is returned.
+// If all hooks return an error, OrComposeDecodeHookFunc returns an error concatenating all error messages.
+func OrComposeDecodeHookFunc(ff ...DecodeHookFunc) DecodeHookFunc {
+	return func(a, b reflect.Value) (interface{}, error) {
+		var allErrs string
+		var out interface{}
+		var err error
+
+		for _, f := range ff {
+			out, err = DecodeHookExec(f, a, b)
+			if err != nil {
+				allErrs += err.Error() + "\n"
+				continue
+			}
+
+			return out, nil
+		}
+
+		return nil, errors.New(allErrs)
+	}
+}
+
 // StringToSliceHookFunc returns a DecodeHookFunc that converts
 // string to []string by splitting on the given sep.
 func StringToSliceHookFunc(sep string) DecodeHookFunc {
@@ -215,3 +236,44 @@ func WeaklyTypedHook(
 
 	return data, nil
 }
+
+func RecursiveStructToMapHookFunc() DecodeHookFunc {
+	return func(f reflect.Value, t reflect.Value) (interface{}, error) {
+		if f.Kind() != reflect.Struct {
+			return f.Interface(), nil
+		}
+
+		var i interface{} = struct{}{}
+		if t.Type() != reflect.TypeOf(&i).Elem() {
+			return f.Interface(), nil
+		}
+
+		m := make(map[string]interface{})
+		t.Set(reflect.ValueOf(m))
+
+		return f.Interface(), nil
+	}
+}
+
+// TextUnmarshallerHookFunc returns a DecodeHookFunc that applies
+// strings to the UnmarshalText function, when the target type
+// implements the encoding.TextUnmarshaler interface
+func TextUnmarshallerHookFunc() DecodeHookFuncType {
+	return func(
+		f reflect.Type,
+		t reflect.Type,
+		data interface{}) (interface{}, error) {
+		if f.Kind() != reflect.String {
+			return data, nil
+		}
+		result := reflect.New(t).Interface()
+		unmarshaller, ok := result.(encoding.TextUnmarshaler)
+		if !ok {
+			return data, nil
+		}
+		if err := unmarshaller.UnmarshalText([]byte(data.(string))); err != nil {
+			return nil, err
+		}
+		return result, nil
+	}
+}

vendor/github.com/mitchellh/mapstructure/mapstructure.go

@@ -72,6 +72,17 @@
 //         "name": "alice",
 //     }
 //
+// When decoding from a struct to a map, the squash tag squashes the struct
+// fields into a single map. Using the example structs from above:
+//
+//     Friend{Person: Person{Name: "alice"}}
+//
+// Will be decoded into a map:
+//
+//     map[string]interface{}{
+//         "name": "alice",
+//     }
+//
 // DecoderConfig has a field that changes the behavior of mapstructure
 // to always squash embedded structs.
 //
@@ -111,7 +122,7 @@
 // field value is zero and a numeric type, the field is empty, and it won't
 // be encoded into the destination type.
 //
-//     type Source {
+//     type Source struct {
 //         Age int `mapstructure:",omitempty"`
 //     }
 //
@@ -161,10 +172,11 @@ import (
 // data transformations. See "DecodeHook" in the DecoderConfig
 // struct.
 //
-// The type should be DecodeHookFuncType or DecodeHookFuncKind.
+// The type must be one of DecodeHookFuncType, DecodeHookFuncKind, or
-// Either is accepted. Types are a superset of Kinds (Types can return
+// DecodeHookFuncValue.
-// Kinds) and are generally a richer thing to use, but Kinds are simpler
+// Values are a superset of Types (Values can return types), and Types are a
-// if you only need those.
+// superset of Kinds (Types can return Kinds) and are generally a richer thing
+// to use, but Kinds are simpler if you only need those.
 //
 // The reason DecodeHookFunc is multi-typed is for backwards compatibility:
 // we started with Kinds and then realized Types were the better solution,
@@ -180,15 +192,22 @@ type DecodeHookFuncType func(reflect.Type, reflect.Type, interface{}) (interface
 // source and target types.
 type DecodeHookFuncKind func(reflect.Kind, reflect.Kind, interface{}) (interface{}, error)
 
+// DecodeHookFuncValue is a DecodeHookFunc which has complete access to both the source and target
+// values.
+type DecodeHookFuncValue func(from reflect.Value, to reflect.Value) (interface{}, error)
+
 // DecoderConfig is the configuration that is used to create a new decoder
 // and allows customization of various aspects of decoding.
 type DecoderConfig struct {
 	// DecodeHook, if set, will be called before any decoding and any
 	// type conversion (if WeaklyTypedInput is on). This lets you modify
-	// the values before they're set down onto the resulting struct.
+	// the values before they're set down onto the resulting struct. The
+	// DecodeHook is called for every map and value in the input. This means
+	// that if a struct has embedded fields with squash tags the decode hook
+	// is called only once with all of the input data, not once for each
+	// embedded struct.
 	//
-	// If an error is returned, the entire decode will fail with that
+	// If an error is returned, the entire decode will fail with that error.
-	// error.
 	DecodeHook DecodeHookFunc
 
 	// If ErrorUnused is true, then it is an error for there to exist
@@ -196,6 +215,12 @@ type DecoderConfig struct {
 	// (extra keys).
 	ErrorUnused bool
 
+	// If ErrorUnset is true, then it is an error for there to exist
+	// fields in the result that were not set in the decoding process
+	// (extra fields). This only applies to decoding to a struct. This
+	// will affect all nested structs as well.
+	ErrorUnset bool
+
 	// ZeroFields, if set to true, will zero fields before writing them.
 	// For example, a map will be emptied before decoded values are put in
 	// it. If this is false, a map will be merged.
@@ -239,6 +264,15 @@ type DecoderConfig struct {
 	// The tag name that mapstructure reads for field names. This
 	// defaults to "mapstructure"
 	TagName string
+
+	// IgnoreUntaggedFields ignores all struct fields without explicit
+	// TagName, comparable to `mapstructure:"-"` as default behaviour.
+	IgnoreUntaggedFields bool
+
+	// MatchName is the function used to match the map key to the struct
+	// field name or tag. Defaults to `strings.EqualFold`. This can be used
+	// to implement case-sensitive tag values, support snake casing, etc.
+	MatchName func(mapKey, fieldName string) bool
 }
 
 // A Decoder takes a raw interface value and turns it into structured
@@ -260,6 +294,11 @@ type Metadata struct {
 	// Unused is a slice of keys that were found in the raw value but
 	// weren't decoded since there was no matching field in the result interface
 	Unused []string
+
+	// Unset is a slice of field names that were found in the result interface
+	// but weren't set in the decoding process since there was no matching value
+	// in the input
+	Unset []string
 }
 
 // Decode takes an input structure and uses reflection to translate it to
@@ -351,12 +390,20 @@ func NewDecoder(config *DecoderConfig) (*Decoder, error) {
 		if config.Metadata.Unused == nil {
 			config.Metadata.Unused = make([]string, 0)
 		}
+
+		if config.Metadata.Unset == nil {
+			config.Metadata.Unset = make([]string, 0)
+		}
 	}
 
 	if config.TagName == "" {
 		config.TagName = "mapstructure"
 	}
 
+	if config.MatchName == nil {
+		config.MatchName = strings.EqualFold
+	}
+
 	result := &Decoder{
 		config: config,
 	}
@@ -409,9 +456,7 @@ func (d *Decoder) decode(name string, input interface{}, outVal reflect.Value) e
 	if d.config.DecodeHook != nil {
 		// We have a DecodeHook, so let's pre-process the input.
 		var err error
-		input, err = DecodeHookExec(
+		input, err = DecodeHookExec(d.config.DecodeHook, inputVal, outVal)
-			d.config.DecodeHook,
-			inputVal.Type(), outVal.Type(), input)
 		if err != nil {
 			return fmt.Errorf("error decoding '%s': %s", name, err)
 		}
@@ -562,8 +607,8 @@ func (d *Decoder) decodeString(name string, data interface{}, val reflect.Value)
 
 	if !converted {
 		return fmt.Errorf(
-			"'%s' expected type '%s', got unconvertible type '%s'",
+			"'%s' expected type '%s', got unconvertible type '%s', value: '%v'",
-			name, val.Type(), dataVal.Type())
+			name, val.Type(), dataVal.Type(), data)
 	}
 
 	return nil
@@ -588,7 +633,12 @@ func (d *Decoder) decodeInt(name string, data interface{}, val reflect.Value) er
 			val.SetInt(0)
 		}
 	case dataKind == reflect.String && d.config.WeaklyTypedInput:
-		i, err := strconv.ParseInt(dataVal.String(), 0, val.Type().Bits())
+		str := dataVal.String()
+		if str == "" {
+			str = "0"
+		}
+
+		i, err := strconv.ParseInt(str, 0, val.Type().Bits())
 		if err == nil {
 			val.SetInt(i)
 		} else {
@@ -604,8 +654,8 @@ func (d *Decoder) decodeInt(name string, data interface{}, val reflect.Value) er
 		val.SetInt(i)
 	default:
 		return fmt.Errorf(
-			"'%s' expected type '%s', got unconvertible type '%s'",
+			"'%s' expected type '%s', got unconvertible type '%s', value: '%v'",
-			name, val.Type(), dataVal.Type())
+			name, val.Type(), dataVal.Type(), data)
 	}
 
 	return nil
@@ -640,7 +690,12 @@ func (d *Decoder) decodeUint(name string, data interface{}, val reflect.Value) e
 			val.SetUint(0)
 		}
 	case dataKind == reflect.String && d.config.WeaklyTypedInput:
-		i, err := strconv.ParseUint(dataVal.String(), 0, val.Type().Bits())
+		str := dataVal.String()
+		if str == "" {
+			str = "0"
+		}
+
+		i, err := strconv.ParseUint(str, 0, val.Type().Bits())
 		if err == nil {
 			val.SetUint(i)
 		} else {
@@ -648,20 +703,16 @@ func (d *Decoder) decodeUint(name string, data interface{}, val reflect.Value) e
 		}
 	case dataType.PkgPath() == "encoding/json" && dataType.Name() == "Number":
 		jn := data.(json.Number)
-		i, err := jn.Int64()
+		i, err := strconv.ParseUint(string(jn), 0, 64)
 		if err != nil {
 			return fmt.Errorf(
 				"error decoding json.Number into %s: %s", name, err)
 		}
-		if i < 0 && !d.config.WeaklyTypedInput {
+		val.SetUint(i)
-			return fmt.Errorf("cannot parse '%s', %d overflows uint",
-				name, i)
-		}
-		val.SetUint(uint64(i))
 	default:
 		return fmt.Errorf(
-			"'%s' expected type '%s', got unconvertible type '%s'",
+			"'%s' expected type '%s', got unconvertible type '%s', value: '%v'",
-			name, val.Type(), dataVal.Type())
+			name, val.Type(), dataVal.Type(), data)
 	}
 
 	return nil
@@ -691,8 +742,8 @@ func (d *Decoder) decodeBool(name string, data interface{}, val reflect.Value) e
 		}
 	default:
 		return fmt.Errorf(
-			"'%s' expected type '%s', got unconvertible type '%s'",
+			"'%s' expected type '%s', got unconvertible type '%s', value: '%v'",
-			name, val.Type(), dataVal.Type())
+			name, val.Type(), dataVal.Type(), data)
 	}
 
 	return nil
@@ -717,7 +768,12 @@ func (d *Decoder) decodeFloat(name string, data interface{}, val reflect.Value)
 			val.SetFloat(0)
 		}
 	case dataKind == reflect.String && d.config.WeaklyTypedInput:
-		f, err := strconv.ParseFloat(dataVal.String(), val.Type().Bits())
+		str := dataVal.String()
+		if str == "" {
+			str = "0"
+		}
+
+		f, err := strconv.ParseFloat(str, val.Type().Bits())
 		if err == nil {
 			val.SetFloat(f)
 		} else {
@@ -733,8 +789,8 @@ func (d *Decoder) decodeFloat(name string, data interface{}, val reflect.Value)
 		val.SetFloat(i)
 	default:
 		return fmt.Errorf(
-			"'%s' expected type '%s', got unconvertible type '%s'",
+			"'%s' expected type '%s', got unconvertible type '%s', value: '%v'",
-			name, val.Type(), dataVal.Type())
+			name, val.Type(), dataVal.Type(), data)
 	}
 
 	return nil
@@ -785,7 +841,7 @@ func (d *Decoder) decodeMapFromSlice(name string, dataVal reflect.Value, val ref
 
 	for i := 0; i < dataVal.Len(); i++ {
 		err := d.decode(
-			fmt.Sprintf("%s[%d]", name, i),
+			name+"["+strconv.Itoa(i)+"]",
 			dataVal.Index(i).Interface(), val)
 		if err != nil {
 			return err
@@ -818,7 +874,7 @@ func (d *Decoder) decodeMapFromMap(name string, dataVal reflect.Value, val refle
 	}
 
 	for _, k := range dataVal.MapKeys() {
-		fieldName := fmt.Sprintf("%s[%s]", name, k)
+		fieldName := name + "[" + k.String() + "]"
 
 		// First decode the key into the proper type
 		currentKey := reflect.Indirect(reflect.New(valKeyType))
@@ -869,8 +925,15 @@ func (d *Decoder) decodeMapFromStruct(name string, dataVal reflect.Value, val re
 		tagValue := f.Tag.Get(d.config.TagName)
 		keyName := f.Name
 
+		if tagValue == "" && d.config.IgnoreUntaggedFields {
+			continue
+		}
+
 		// If Squash is set in the config, we squash the field down.
 		squash := d.config.Squash && v.Kind() == reflect.Struct && f.Anonymous
+
+		v = dereferencePtrToStructIfNeeded(v, d.config.TagName)
+
 		// Determine the name of the key in the map
 		if index := strings.Index(tagValue, ","); index != -1 {
 			if tagValue[:index] == "-" {
@@ -882,11 +945,21 @@ func (d *Decoder) decodeMapFromStruct(name string, dataVal reflect.Value, val re
 			}
 
 			// If "squash" is specified in the tag, we squash the field down.
-			squash = !squash && strings.Index(tagValue[index+1:], "squash") != -1
+			squash = squash || strings.Index(tagValue[index+1:], "squash") != -1
-			if squash && v.Kind() != reflect.Struct {
+			if squash {
+				// When squashing, the embedded type can be a pointer to a struct.
+				if v.Kind() == reflect.Ptr && v.Elem().Kind() == reflect.Struct {
+					v = v.Elem()
+				}
+
+				// The final type must be a struct
+				if v.Kind() != reflect.Struct {
 					return fmt.Errorf("cannot squash non-struct type '%s'", v.Type())
 				}
-			keyName = tagValue[:index]
+			}
+			if keyNameTagValue := tagValue[:index]; keyNameTagValue != "" {
+				keyName = keyNameTagValue
+			}
 		} else if len(tagValue) > 0 {
 			if tagValue == "-" {
 				continue
@@ -906,11 +979,22 @@ func (d *Decoder) decodeMapFromStruct(name string, dataVal reflect.Value, val re
 			mType := reflect.MapOf(vKeyType, vElemType)
 			vMap := reflect.MakeMap(mType)
 
-			err := d.decode(keyName, x.Interface(), vMap)
+			// Creating a pointer to a map so that other methods can completely
+			// overwrite the map if need be (looking at you decodeMapFromMap). The
+			// indirection allows the underlying map to be settable (CanSet() == true)
+			// where as reflect.MakeMap returns an unsettable map.
+			addrVal := reflect.New(vMap.Type())
+			reflect.Indirect(addrVal).Set(vMap)
+
+			err := d.decode(keyName, x.Interface(), reflect.Indirect(addrVal))
 			if err != nil {
 				return err
 			}
 
+			// the underlying map may have been completely overwritten so pull
+			// it indirectly out of the enclosing value.
+			vMap = reflect.Indirect(addrVal)
+
 			if squash {
 				for _, k := range vMap.MapKeys() {
 					valMap.SetMapIndex(k, vMap.MapIndex(k))
@@ -984,8 +1068,8 @@ func (d *Decoder) decodeFunc(name string, data interface{}, val reflect.Value) e
 	dataVal := reflect.Indirect(reflect.ValueOf(data))
 	if val.Type() != dataVal.Type() {
 		return fmt.Errorf(
-			"'%s' expected type '%s', got unconvertible type '%s'",
+			"'%s' expected type '%s', got unconvertible type '%s', value: '%v'",
-			name, val.Type(), dataVal.Type())
+			name, val.Type(), dataVal.Type(), data)
 	}
 	val.Set(dataVal)
 	return nil
@@ -1031,7 +1115,7 @@ func (d *Decoder) decodeSlice(name string, data interface{}, val reflect.Value)
 	}
 
 	// If the input value is nil, then don't allocate since empty != nil
-	if dataVal.IsNil() {
+	if dataValKind != reflect.Array && dataVal.IsNil() {
 		return nil
 	}
 
@@ -1051,7 +1135,7 @@ func (d *Decoder) decodeSlice(name string, data interface{}, val reflect.Value)
 		}
 		currentField := valSlice.Index(i)
 
-		fieldName := fmt.Sprintf("%s[%d]", name, i)
+		fieldName := name + "[" + strconv.Itoa(i) + "]"
 		if err := d.decode(fieldName, currentData, currentField); err != nil {
 			errors = appendErrors(errors, err)
 		}
@@ -1118,7 +1202,7 @@ func (d *Decoder) decodeArray(name string, data interface{}, val reflect.Value)
 		currentData := dataVal.Index(i).Interface()
 		currentField := valArray.Index(i)
 
-		fieldName := fmt.Sprintf("%s[%d]", name, i)
+		fieldName := name + "[" + strconv.Itoa(i) + "]"
 		if err := d.decode(fieldName, currentData, currentField); err != nil {
 			errors = appendErrors(errors, err)
 		}
@@ -1154,13 +1238,23 @@ func (d *Decoder) decodeStruct(name string, data interface{}, val reflect.Value)
 		// Not the most efficient way to do this but we can optimize later if
 		// we want to. To convert from struct to struct we go to map first
 		// as an intermediary.
-		m := make(map[string]interface{})
+
-		mval := reflect.Indirect(reflect.ValueOf(&m))
+		// Make a new map to hold our result
-		if err := d.decodeMapFromStruct(name, dataVal, mval, mval); err != nil {
+		mapType := reflect.TypeOf((map[string]interface{})(nil))
+		mval := reflect.MakeMap(mapType)
+
+		// Creating a pointer to a map so that other methods can completely
+		// overwrite the map if need be (looking at you decodeMapFromMap). The
+		// indirection allows the underlying map to be settable (CanSet() == true)
+		// where as reflect.MakeMap returns an unsettable map.
+		addrVal := reflect.New(mval.Type())
+
+		reflect.Indirect(addrVal).Set(mval)
+		if err := d.decodeMapFromStruct(name, dataVal, reflect.Indirect(addrVal), mval); err != nil {
 			return err
 		}
 
-		result := d.decodeStructFromMap(name, mval, val)
+		result := d.decodeStructFromMap(name, reflect.Indirect(addrVal), val)
 		return result
 
 	default:
@@ -1183,6 +1277,7 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 		dataValKeysUnused[dataValKey.Interface()] = struct{}{}
 	}
 
+	targetValKeysUnused := make(map[interface{}]struct{})
 	errors := make([]string, 0)
 
 	// This slice will keep track of all the structs we'll be decoding.
@@ -1211,10 +1306,14 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 
 		for i := 0; i < structType.NumField(); i++ {
 			fieldType := structType.Field(i)
-			fieldKind := fieldType.Type.Kind()
+			fieldVal := structVal.Field(i)
+			if fieldVal.Kind() == reflect.Ptr && fieldVal.Elem().Kind() == reflect.Struct {
+				// Handle embedded struct pointers as embedded structs.
+				fieldVal = fieldVal.Elem()
+			}
 
 			// If "squash" is specified in the tag, we squash the field down.
-			squash := d.config.Squash && fieldKind == reflect.Struct && fieldType.Anonymous
+			squash := d.config.Squash && fieldVal.Kind() == reflect.Struct && fieldType.Anonymous
 			remain := false
 
 			// We always parse the tags cause we're looking for other tags too
@@ -1232,21 +1331,21 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 			}
 
 			if squash {
-				if fieldKind != reflect.Struct {
+				if fieldVal.Kind() != reflect.Struct {
 					errors = appendErrors(errors,
-						fmt.Errorf("%s: unsupported type for squash: %s", fieldType.Name, fieldKind))
+						fmt.Errorf("%s: unsupported type for squash: %s", fieldType.Name, fieldVal.Kind()))
 				} else {
-					structs = append(structs, structVal.FieldByName(fieldType.Name))
+					structs = append(structs, fieldVal)
 				}
 				continue
 			}
 
 			// Build our field
 			if remain {
-				remainField = &field{fieldType, structVal.Field(i)}
+				remainField = &field{fieldType, fieldVal}
 			} else {
 				// Normal struct field, store it away
-				fields = append(fields, field{fieldType, structVal.Field(i)})
+				fields = append(fields, field{fieldType, fieldVal})
 			}
 		}
 	}
@@ -1274,7 +1373,7 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 					continue
 				}
 
-				if strings.EqualFold(mK, fieldName) {
+				if d.config.MatchName(mK, fieldName) {
 					rawMapKey = dataValKey
 					rawMapVal = dataVal.MapIndex(dataValKey)
 					break
@@ -1283,7 +1382,8 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 
 			if !rawMapVal.IsValid() {
 				// There was no matching key in the map for the value in
-				// the struct. Just ignore.
+				// the struct. Remember it for potential errors and metadata.
+				targetValKeysUnused[fieldName] = struct{}{}
 				continue
 			}
 		}
@@ -1305,7 +1405,7 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 		// If the name is empty string, then we're at the root, and we
 		// don't dot-join the fields.
 		if name != "" {
-			fieldName = fmt.Sprintf("%s.%s", name, fieldName)
+			fieldName = name + "." + fieldName
 		}
 
 		if err := d.decode(fieldName, rawMapVal.Interface(), fieldValue); err != nil {
@@ -1343,6 +1443,17 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 		errors = appendErrors(errors, err)
 	}
 
+	if d.config.ErrorUnset && len(targetValKeysUnused) > 0 {
+		keys := make([]string, 0, len(targetValKeysUnused))
+		for rawKey := range targetValKeysUnused {
+			keys = append(keys, rawKey.(string))
+		}
+		sort.Strings(keys)
+
+		err := fmt.Errorf("'%s' has unset fields: %s", name, strings.Join(keys, ", "))
+		errors = appendErrors(errors, err)
+	}
+
 	if len(errors) > 0 {
 		return &Error{errors}
 	}
@@ -1352,11 +1463,19 @@ func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) e
 		for rawKey := range dataValKeysUnused {
 			key := rawKey.(string)
 			if name != "" {
-				key = fmt.Sprintf("%s.%s", name, key)
+				key = name + "." + key
 			}
 
 			d.config.Metadata.Unused = append(d.config.Metadata.Unused, key)
 		}
+		for rawKey := range targetValKeysUnused {
+			key := rawKey.(string)
+			if name != "" {
+				key = name + "." + key
+			}
+
+			d.config.Metadata.Unset = append(d.config.Metadata.Unset, key)
+		}
 	}
 
 	return nil
@@ -1394,3 +1513,28 @@ func getKind(val reflect.Value) reflect.Kind {
 		return kind
 	}
 }
+
+func isStructTypeConvertibleToMap(typ reflect.Type, checkMapstructureTags bool, tagName string) bool {
+	for i := 0; i < typ.NumField(); i++ {
+		f := typ.Field(i)
+		if f.PkgPath == "" && !checkMapstructureTags { // check for unexported fields
+			return true
+		}
+		if checkMapstructureTags && f.Tag.Get(tagName) != "" { // check for mapstructure tags inside
+			return true
+		}
+	}
+	return false
+}
+
+func dereferencePtrToStructIfNeeded(v reflect.Value, tagName string) reflect.Value {
+	if v.Kind() != reflect.Ptr || v.Elem().Kind() != reflect.Struct {
+		return v
+	}
+	deref := v.Elem()
+	derefT := deref.Type()
+	if isStructTypeConvertibleToMap(derefT, true, tagName) {
+		return deref
+	}
+	return v
+}

vendor/modules.txt

@@ -177,7 +177,7 @@ github.com/matttproud/golang_protobuf_extensions/pbutil
 # github.com/miekg/pkcs11 v1.1.1
 ## explicit; go 1.12
 github.com/miekg/pkcs11
-# github.com/mitchellh/mapstructure v1.3.2
+# github.com/mitchellh/mapstructure v1.5.0
 ## explicit; go 1.14
 github.com/mitchellh/mapstructure
 # github.com/moby/patternmatcher v0.6.0