Initial transfer of provider code

5 files changed, 1094 insertions, 0 deletions

diff --git a/vendor/github.com/mitchellh/mapstructure/LICENSE b/vendor/github.com/mitchellh/mapstructure/LICENSE
new file mode 100644
index 0000000..f9c841a
--- /dev/null
+++ b/vendor/github.com/mitchellh/mapstructure/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2013 Mitchell Hashimoto
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/vendor/github.com/mitchellh/mapstructure/README.md b/vendor/github.com/mitchellh/mapstructure/README.md
new file mode 100644
index 0000000..659d688
--- /dev/null
+++ b/vendor/github.com/mitchellh/mapstructure/README.md
@@ -0,0 +1,46 @@
+# mapstructure
+
+mapstructure is a Go library for decoding generic map values to structures
+and vice versa, while providing helpful error handling.
+
+This library is most useful when decoding values from some data stream (JSON,
+Gob, etc.) where you don't _quite_ know the structure of the underlying data
+until you read a part of it. You can therefore read a `map[string]interface{}`
+and use this library to decode it into the proper underlying native Go
+structure.
+
+## Installation
+
+Standard `go get`:
+
+```
+$ go get github.com/mitchellh/mapstructure
+```
+
+## Usage & Example
+
+For usage and examples see the [Godoc](http://godoc.org/github.com/mitchellh/mapstructure).
+
+The `Decode` function has examples associated with it there.
+
+## But Why?!
+
+Go offers fantastic standard libraries for decoding formats such as JSON.
+The standard method is to have a struct pre-created, and populate that struct
+from the bytes of the encoded format. This is great, but the problem is if
+you have configuration or an encoding that changes slightly depending on
+specific fields. For example, consider this JSON:
+
+```json
+{
+  "type": "person",
+  "name": "Mitchell"
+}
+```
+
+Perhaps we can't populate a specific structure without first reading
+the "type" field from the JSON. We could always do two passes over the
+decoding of the JSON (reading the "type" first, and the rest later).
+However, it is much simpler to just decode this into a `map[string]interface{}`
+structure, read the "type" key, then use something like this library
+to decode it into the proper structure.
diff --git a/vendor/github.com/mitchellh/mapstructure/decode_hooks.go b/vendor/github.com/mitchellh/mapstructure/decode_hooks.go
new file mode 100644
index 0000000..115ae67
--- /dev/null
+++ b/vendor/github.com/mitchellh/mapstructure/decode_hooks.go
@@ -0,0 +1,154 @@
+package mapstructure
+
+import (
+        "errors"
+        "reflect"
+        "strconv"
+        "strings"
+        "time"
+)
+
+// typedDecodeHook takes a raw DecodeHookFunc (an interface{}) and turns
+// it into the proper DecodeHookFunc type, such as DecodeHookFuncType.
+func typedDecodeHook(h DecodeHookFunc) DecodeHookFunc {
+        // Create variables here so we can reference them with the reflect pkg
+        var f1 DecodeHookFuncType
+        var f2 DecodeHookFuncKind
+
+        // Fill in the variables into this interface and the rest is done
+        // automatically using the reflect package.
+        potential := []interface{}{f1, f2}
+
+        v := reflect.ValueOf(h)
+        vt := v.Type()
+        for _, raw := range potential {
+                pt := reflect.ValueOf(raw).Type()
+                if vt.ConvertibleTo(pt) {
+                        return v.Convert(pt).Interface()
+                }
+        }
+
+        return nil
+}
+
+// DecodeHookExec executes the given decode hook. This should be used
+// since it'll naturally degrade to the older backwards compatible DecodeHookFunc
+// that took reflect.Kind instead of reflect.Type.
+func DecodeHookExec(
+        raw DecodeHookFunc,
+        from reflect.Type, to reflect.Type,
+        data interface{}) (interface{}, error) {
+        // Build our arguments that reflect expects
+        argVals := make([]reflect.Value, 3)
+        argVals[0] = reflect.ValueOf(from)
+        argVals[1] = reflect.ValueOf(to)
+        argVals[2] = reflect.ValueOf(data)
+
+        switch f := typedDecodeHook(raw).(type) {
+        case DecodeHookFuncType:
+                return f(from, to, data)
+        case DecodeHookFuncKind:
+                return f(from.Kind(), to.Kind(), data)
+        default:
+                return nil, errors.New("invalid decode hook signature")
+        }
+}
+
+// ComposeDecodeHookFunc creates a single DecodeHookFunc that
+// automatically composes multiple DecodeHookFuncs.
+//
+// The composed funcs are called in order, with the result of the
+// previous transformation.
+func ComposeDecodeHookFunc(fs ...DecodeHookFunc) DecodeHookFunc {
+        return func(
+                f reflect.Type,
+                t reflect.Type,
+                data interface{}) (interface{}, error) {
+                var err error
+                for _, f1 := range fs {
+                        data, err = DecodeHookExec(f1, f, t, data)
+                        if err != nil {
+                                return nil, err
+                        }
+
+                        // 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
+        }
+}
+
+// StringToSliceHookFunc returns a DecodeHookFunc that converts
+// string to []string by splitting on the given sep.
+func StringToSliceHookFunc(sep string) DecodeHookFunc {
+        return func(
+                f reflect.Kind,
+                t reflect.Kind,
+                data interface{}) (interface{}, error) {
+                if f != reflect.String || t != reflect.Slice {
+                        return data, nil
+                }
+
+                raw := data.(string)
+                if raw == "" {
+                        return []string{}, nil
+                }
+
+                return strings.Split(raw, sep), nil
+        }
+}
+
+// StringToTimeDurationHookFunc returns a DecodeHookFunc that converts
+// strings to time.Duration.
+func StringToTimeDurationHookFunc() DecodeHookFunc {
+        return func(
+                f reflect.Type,
+                t reflect.Type,
+                data interface{}) (interface{}, error) {
+                if f.Kind() != reflect.String {
+                        return data, nil
+                }
+                if t != reflect.TypeOf(time.Duration(5)) {
+                        return data, nil
+                }
+
+                // Convert it by parsing
+                return time.ParseDuration(data.(string))
+        }
+}
+
+func WeaklyTypedHook(
+        f reflect.Kind,
+        t reflect.Kind,
+        data interface{}) (interface{}, error) {
+        dataVal := reflect.ValueOf(data)
+        switch t {
+        case reflect.String:
+                switch f {
+                case reflect.Bool:
+                        if dataVal.Bool() {
+                                return "1", nil
+                        } else {
+                                return "0", nil
+                        }
+                case reflect.Float32:
+                        return strconv.FormatFloat(dataVal.Float(), 'f', -1, 64), nil
+                case reflect.Int:
+                        return strconv.FormatInt(dataVal.Int(), 10), nil
+                case reflect.Slice:
+                        dataType := dataVal.Type()
+                        elemKind := dataType.Elem().Kind()
+                        if elemKind == reflect.Uint8 {
+                                return string(dataVal.Interface().([]uint8)), nil
+                        }
+                case reflect.Uint:
+                        return strconv.FormatUint(dataVal.Uint(), 10), nil
+                }
+        }
+
+        return data, nil
+}
diff --git a/vendor/github.com/mitchellh/mapstructure/error.go b/vendor/github.com/mitchellh/mapstructure/error.go
new file mode 100644
index 0000000..47a99e5
--- /dev/null
+++ b/vendor/github.com/mitchellh/mapstructure/error.go
@@ -0,0 +1,50 @@
+package mapstructure
+
+import (
+        "errors"
+        "fmt"
+        "sort"
+        "strings"
+)
+
+// Error implements the error interface and can represents multiple
+// errors that occur in the course of a single decode.
+type Error struct {
+        Errors []string
+}
+
+func (e *Error) Error() string {
+        points := make([]string, len(e.Errors))
+        for i, err := range e.Errors {
+                points[i] = fmt.Sprintf("* %s", err)
+        }
+
+        sort.Strings(points)
+        return fmt.Sprintf(
+                "%d error(s) decoding:\n\n%s",
+                len(e.Errors), strings.Join(points, "\n"))
+}
+
+// WrappedErrors implements the errwrap.Wrapper interface to make this
+// return value more useful with the errwrap and go-multierror libraries.
+func (e *Error) WrappedErrors() []error {
+        if e == nil {
+                return nil
+        }
+
+        result := make([]error, len(e.Errors))
+        for i, e := range e.Errors {
+                result[i] = errors.New(e)
+        }
+
+        return result
+}
+
+func appendErrors(errors []string, err error) []string {
+        switch e := err.(type) {
+        case *Error:
+                return append(errors, e.Errors...)
+        default:
+                return append(errors, e.Error())
+        }
+}
diff --git a/vendor/github.com/mitchellh/mapstructure/mapstructure.go b/vendor/github.com/mitchellh/mapstructure/mapstructure.go
new file mode 100644
index 0000000..6dee0ef
--- /dev/null
+++ b/vendor/github.com/mitchellh/mapstructure/mapstructure.go
@@ -0,0 +1,823 @@
+// The mapstructure package exposes functionality to convert an
+// arbitrary map[string]interface{} into a native Go structure.
+//
+// The Go structure can be arbitrarily complex, containing slices,
+// other structs, etc. and the decoder will properly decode nested
+// maps and so on into the proper structures in the native Go struct.
+// See the examples to see what the decoder is capable of.
+package mapstructure
+
+import (
+        "encoding/json"
+        "errors"
+        "fmt"
+        "reflect"
+        "sort"
+        "strconv"
+        "strings"
+)
+
+// DecodeHookFunc is the callback function that can be used for
+// data transformations. See "DecodeHook" in the DecoderConfig
+// struct.
+//
+// The type should be DecodeHookFuncType or DecodeHookFuncKind.
+// Either is accepted. Types are a 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,
+// but have a promise to not break backwards compat so we now support
+// both.
+type DecodeHookFunc interface{}
+
+type DecodeHookFuncType func(reflect.Type, reflect.Type, interface{}) (interface{}, error)
+type DecodeHookFuncKind func(reflect.Kind, reflect.Kind, interface{}) (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.
+        //
+        // If an error is returned, the entire decode will fail with that
+        // error.
+        DecodeHook DecodeHookFunc
+
+        // If ErrorUnused is true, then it is an error for there to exist
+        // keys in the original map that were unused in the decoding process
+        // (extra keys).
+        ErrorUnused 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.
+        ZeroFields bool
+
+        // If WeaklyTypedInput is true, the decoder will make the following
+        // "weak" conversions:
+        //
+        //   - bools to string (true = "1", false = "0")
+        //   - numbers to string (base 10)
+        //   - bools to int/uint (true = 1, false = 0)
+        //   - strings to int/uint (base implied by prefix)
+        //   - int to bool (true if value != 0)
+        //   - string to bool (accepts: 1, t, T, TRUE, true, True, 0, f, F,
+        //     FALSE, false, False. Anything else is an error)
+        //   - empty array = empty map and vice versa
+        //   - negative numbers to overflowed uint values (base 10)
+        //   - slice of maps to a merged map
+        //   - single values are converted to slices if required. Each
+        //     element is weakly decoded. For example: "4" can become []int{4}
+        //     if the target type is an int slice.
+        //
+        WeaklyTypedInput bool
+
+        // Metadata is the struct that will contain extra metadata about
+        // the decoding. If this is nil, then no metadata will be tracked.
+        Metadata *Metadata
+
+        // Result is a pointer to the struct that will contain the decoded
+        // value.
+        Result interface{}
+
+        // The tag name that mapstructure reads for field names. This
+        // defaults to "mapstructure"
+        TagName string
+}
+
+// A Decoder takes a raw interface value and turns it into structured
+// data, keeping track of rich error information along the way in case
+// anything goes wrong. Unlike the basic top-level Decode method, you can
+// more finely control how the Decoder behaves using the DecoderConfig
+// structure. The top-level Decode method is just a convenience that sets
+// up the most basic Decoder.
+type Decoder struct {
+        config *DecoderConfig
+}
+
+// Metadata contains information about decoding a structure that
+// is tedious or difficult to get otherwise.
+type Metadata struct {
+        // Keys are the keys of the structure which were successfully decoded
+        Keys []string
+
+        // 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
+}
+
+// Decode takes a map and uses reflection to convert it into the
+// given Go native structure. val must be a pointer to a struct.
+func Decode(m interface{}, rawVal interface{}) error {
+        config := &DecoderConfig{
+                Metadata: nil,
+                Result:   rawVal,
+        }
+
+        decoder, err := NewDecoder(config)
+        if err != nil {
+                return err
+        }
+
+        return decoder.Decode(m)
+}
+
+// WeakDecode is the same as Decode but is shorthand to enable
+// WeaklyTypedInput. See DecoderConfig for more info.
+func WeakDecode(input, output interface{}) error {
+        config := &DecoderConfig{
+                Metadata:         nil,
+                Result:           output,
+                WeaklyTypedInput: true,
+        }
+
+        decoder, err := NewDecoder(config)
+        if err != nil {
+                return err
+        }
+
+        return decoder.Decode(input)
+}
+
+// NewDecoder returns a new decoder for the given configuration. Once
+// a decoder has been returned, the same configuration must not be used
+// again.
+func NewDecoder(config *DecoderConfig) (*Decoder, error) {
+        val := reflect.ValueOf(config.Result)
+        if val.Kind() != reflect.Ptr {
+                return nil, errors.New("result must be a pointer")
+        }
+
+        val = val.Elem()
+        if !val.CanAddr() {
+                return nil, errors.New("result must be addressable (a pointer)")
+        }
+
+        if config.Metadata != nil {
+                if config.Metadata.Keys == nil {
+                        config.Metadata.Keys = make([]string, 0)
+                }
+
+                if config.Metadata.Unused == nil {
+                        config.Metadata.Unused = make([]string, 0)
+                }
+        }
+
+        if config.TagName == "" {
+                config.TagName = "mapstructure"
+        }
+
+        result := &Decoder{
+                config: config,
+        }
+
+        return result, nil
+}
+
+// Decode decodes the given raw interface to the target pointer specified
+// by the configuration.
+func (d *Decoder) Decode(raw interface{}) error {
+        return d.decode("", raw, reflect.ValueOf(d.config.Result).Elem())
+}
+
+// Decodes an unknown data type into a specific reflection value.
+func (d *Decoder) decode(name string, data interface{}, val reflect.Value) error {
+        if data == nil {
+                // If the data is nil, then we don't set anything.
+                return nil
+        }
+
+        dataVal := reflect.ValueOf(data)
+        if !dataVal.IsValid() {
+                // If the data value is invalid, then we just set the value
+                // to be the zero value.
+                val.Set(reflect.Zero(val.Type()))
+                return nil
+        }
+
+        if d.config.DecodeHook != nil {
+                // We have a DecodeHook, so let's pre-process the data.
+                var err error
+                data, err = DecodeHookExec(
+                        d.config.DecodeHook,
+                        dataVal.Type(), val.Type(), data)
+                if err != nil {
+                        return fmt.Errorf("error decoding '%s': %s", name, err)
+                }
+        }
+
+        var err error
+        dataKind := getKind(val)
+        switch dataKind {
+        case reflect.Bool:
+                err = d.decodeBool(name, data, val)
+        case reflect.Interface:
+                err = d.decodeBasic(name, data, val)
+        case reflect.String:
+                err = d.decodeString(name, data, val)
+        case reflect.Int:
+                err = d.decodeInt(name, data, val)
+        case reflect.Uint:
+                err = d.decodeUint(name, data, val)
+        case reflect.Float32:
+                err = d.decodeFloat(name, data, val)
+        case reflect.Struct:
+                err = d.decodeStruct(name, data, val)
+        case reflect.Map:
+                err = d.decodeMap(name, data, val)
+        case reflect.Ptr:
+                err = d.decodePtr(name, data, val)
+        case reflect.Slice:
+                err = d.decodeSlice(name, data, val)
+        case reflect.Func:
+                err = d.decodeFunc(name, data, val)
+        default:
+                // If we reached this point then we weren't able to decode it
+                return fmt.Errorf("%s: unsupported type: %s", name, dataKind)
+        }
+
+        // If we reached here, then we successfully decoded SOMETHING, so
+        // mark the key as used if we're tracking metadata.
+        if d.config.Metadata != nil && name != "" {
+                d.config.Metadata.Keys = append(d.config.Metadata.Keys, name)
+        }
+
+        return err
+}
+
+// This decodes a basic type (bool, int, string, etc.) and sets the
+// value to "data" of that type.
+func (d *Decoder) decodeBasic(name string, data interface{}, val reflect.Value) error {
+        dataVal := reflect.ValueOf(data)
+        if !dataVal.IsValid() {
+                dataVal = reflect.Zero(val.Type())
+        }
+
+        dataValType := dataVal.Type()
+        if !dataValType.AssignableTo(val.Type()) {
+                return fmt.Errorf(
+                        "'%s' expected type '%s', got '%s'",
+                        name, val.Type(), dataValType)
+        }
+
+        val.Set(dataVal)
+        return nil
+}
+
+func (d *Decoder) decodeString(name string, data interface{}, val reflect.Value) error {
+        dataVal := reflect.ValueOf(data)
+        dataKind := getKind(dataVal)
+
+        converted := true
+        switch {
+        case dataKind == reflect.String:
+                val.SetString(dataVal.String())
+        case dataKind == reflect.Bool && d.config.WeaklyTypedInput:
+                if dataVal.Bool() {
+                        val.SetString("1")
+                } else {
+                        val.SetString("0")
+                }
+        case dataKind == reflect.Int && d.config.WeaklyTypedInput:
+                val.SetString(strconv.FormatInt(dataVal.Int(), 10))
+        case dataKind == reflect.Uint && d.config.WeaklyTypedInput:
+                val.SetString(strconv.FormatUint(dataVal.Uint(), 10))
+        case dataKind == reflect.Float32 && d.config.WeaklyTypedInput:
+                val.SetString(strconv.FormatFloat(dataVal.Float(), 'f', -1, 64))
+        case dataKind == reflect.Slice && d.config.WeaklyTypedInput:
+                dataType := dataVal.Type()
+                elemKind := dataType.Elem().Kind()
+                switch {
+                case elemKind == reflect.Uint8:
+                        val.SetString(string(dataVal.Interface().([]uint8)))
+                default:
+                        converted = false
+                }
+        default:
+                converted = false
+        }
+
+        if !converted {
+                return fmt.Errorf(
+                        "'%s' expected type '%s', got unconvertible type '%s'",
+                        name, val.Type(), dataVal.Type())
+        }
+
+        return nil
+}
+
+func (d *Decoder) decodeInt(name string, data interface{}, val reflect.Value) error {
+        dataVal := reflect.ValueOf(data)
+        dataKind := getKind(dataVal)
+        dataType := dataVal.Type()
+
+        switch {
+        case dataKind == reflect.Int:
+                val.SetInt(dataVal.Int())
+        case dataKind == reflect.Uint:
+                val.SetInt(int64(dataVal.Uint()))
+        case dataKind == reflect.Float32:
+                val.SetInt(int64(dataVal.Float()))
+        case dataKind == reflect.Bool && d.config.WeaklyTypedInput:
+                if dataVal.Bool() {
+                        val.SetInt(1)
+                } else {
+                        val.SetInt(0)
+                }
+        case dataKind == reflect.String && d.config.WeaklyTypedInput:
+                i, err := strconv.ParseInt(dataVal.String(), 0, val.Type().Bits())
+                if err == nil {
+                        val.SetInt(i)
+                } else {
+                        return fmt.Errorf("cannot parse '%s' as int: %s", name, err)
+                }
+        case dataType.PkgPath() == "encoding/json" && dataType.Name() == "Number":
+                jn := data.(json.Number)
+                i, err := jn.Int64()
+                if err != nil {
+                        return fmt.Errorf(
+                                "error decoding json.Number into %s: %s", name, err)
+                }
+                val.SetInt(i)
+        default:
+                return fmt.Errorf(
+                        "'%s' expected type '%s', got unconvertible type '%s'",
+                        name, val.Type(), dataVal.Type())
+        }
+
+        return nil
+}
+
+func (d *Decoder) decodeUint(name string, data interface{}, val reflect.Value) error {
+        dataVal := reflect.ValueOf(data)
+        dataKind := getKind(dataVal)
+
+        switch {
+        case dataKind == reflect.Int:
+                i := dataVal.Int()
+                if i < 0 && !d.config.WeaklyTypedInput {
+                        return fmt.Errorf("cannot parse '%s', %d overflows uint",
+                                name, i)
+                }
+                val.SetUint(uint64(i))
+        case dataKind == reflect.Uint:
+                val.SetUint(dataVal.Uint())
+        case dataKind == reflect.Float32:
+                f := dataVal.Float()
+                if f < 0 && !d.config.WeaklyTypedInput {
+                        return fmt.Errorf("cannot parse '%s', %f overflows uint",
+                                name, f)
+                }
+                val.SetUint(uint64(f))
+        case dataKind == reflect.Bool && d.config.WeaklyTypedInput:
+                if dataVal.Bool() {
+                        val.SetUint(1)
+                } else {
+                        val.SetUint(0)
+                }
+        case dataKind == reflect.String && d.config.WeaklyTypedInput:
+                i, err := strconv.ParseUint(dataVal.String(), 0, val.Type().Bits())
+                if err == nil {
+                        val.SetUint(i)
+                } else {
+                        return fmt.Errorf("cannot parse '%s' as uint: %s", name, err)
+                }
+        default:
+                return fmt.Errorf(
+                        "'%s' expected type '%s', got unconvertible type '%s'",
+                        name, val.Type(), dataVal.Type())
+        }
+
+        return nil
+}
+
+func (d *Decoder) decodeBool(name string, data interface{}, val reflect.Value) error {
+        dataVal := reflect.ValueOf(data)
+        dataKind := getKind(dataVal)
+
+        switch {
+        case dataKind == reflect.Bool:
+                val.SetBool(dataVal.Bool())
+        case dataKind == reflect.Int && d.config.WeaklyTypedInput:
+                val.SetBool(dataVal.Int() != 0)
+        case dataKind == reflect.Uint && d.config.WeaklyTypedInput:
+                val.SetBool(dataVal.Uint() != 0)
+        case dataKind == reflect.Float32 && d.config.WeaklyTypedInput:
+                val.SetBool(dataVal.Float() != 0)
+        case dataKind == reflect.String && d.config.WeaklyTypedInput:
+                b, err := strconv.ParseBool(dataVal.String())
+                if err == nil {
+                        val.SetBool(b)
+                } else if dataVal.String() == "" {
+                        val.SetBool(false)
+                } else {
+                        return fmt.Errorf("cannot parse '%s' as bool: %s", name, err)
+                }
+        default:
+                return fmt.Errorf(
+                        "'%s' expected type '%s', got unconvertible type '%s'",
+                        name, val.Type(), dataVal.Type())
+        }
+
+        return nil
+}
+
+func (d *Decoder) decodeFloat(name string, data interface{}, val reflect.Value) error {
+        dataVal := reflect.ValueOf(data)
+        dataKind := getKind(dataVal)
+        dataType := dataVal.Type()
+
+        switch {
+        case dataKind == reflect.Int:
+                val.SetFloat(float64(dataVal.Int()))
+        case dataKind == reflect.Uint:
+                val.SetFloat(float64(dataVal.Uint()))
+        case dataKind == reflect.Float32:
+                val.SetFloat(float64(dataVal.Float()))
+        case dataKind == reflect.Bool && d.config.WeaklyTypedInput:
+                if dataVal.Bool() {
+                        val.SetFloat(1)
+                } else {
+                        val.SetFloat(0)
+                }
+        case dataKind == reflect.String && d.config.WeaklyTypedInput:
+                f, err := strconv.ParseFloat(dataVal.String(), val.Type().Bits())
+                if err == nil {
+                        val.SetFloat(f)
+                } else {
+                        return fmt.Errorf("cannot parse '%s' as float: %s", name, err)
+                }
+        case dataType.PkgPath() == "encoding/json" && dataType.Name() == "Number":
+                jn := data.(json.Number)
+                i, err := jn.Float64()
+                if err != nil {
+                        return fmt.Errorf(
+                                "error decoding json.Number into %s: %s", name, err)
+                }
+                val.SetFloat(i)
+        default:
+                return fmt.Errorf(
+                        "'%s' expected type '%s', got unconvertible type '%s'",
+                        name, val.Type(), dataVal.Type())
+        }
+
+        return nil
+}
+
+func (d *Decoder) decodeMap(name string, data interface{}, val reflect.Value) error {
+        valType := val.Type()
+        valKeyType := valType.Key()
+        valElemType := valType.Elem()
+
+        // By default we overwrite keys in the current map
+        valMap := val
+
+        // If the map is nil or we're purposely zeroing fields, make a new map
+        if valMap.IsNil() || d.config.ZeroFields {
+                // Make a new map to hold our result
+                mapType := reflect.MapOf(valKeyType, valElemType)
+                valMap = reflect.MakeMap(mapType)
+        }
+
+        // Check input type
+        dataVal := reflect.Indirect(reflect.ValueOf(data))
+        if dataVal.Kind() != reflect.Map {
+                // In weak mode, we accept a slice of maps as an input...
+                if d.config.WeaklyTypedInput {
+                        switch dataVal.Kind() {
+                        case reflect.Array, reflect.Slice:
+                                // Special case for BC reasons (covered by tests)
+                                if dataVal.Len() == 0 {
+                                        val.Set(valMap)
+                                        return nil
+                                }
+
+                                for i := 0; i < dataVal.Len(); i++ {
+                                        err := d.decode(
+                                                fmt.Sprintf("%s[%d]", name, i),
+                                                dataVal.Index(i).Interface(), val)
+                                        if err != nil {
+                                                return err
+                                        }
+                                }
+
+                                return nil
+                        }
+                }
+
+                return fmt.Errorf("'%s' expected a map, got '%s'", name, dataVal.Kind())
+        }
+
+        // Accumulate errors
+        errors := make([]string, 0)
+
+        for _, k := range dataVal.MapKeys() {
+                fieldName := fmt.Sprintf("%s[%s]", name, k)
+
+                // First decode the key into the proper type
+                currentKey := reflect.Indirect(reflect.New(valKeyType))
+                if err := d.decode(fieldName, k.Interface(), currentKey); err != nil {
+                        errors = appendErrors(errors, err)
+                        continue
+                }
+
+                // Next decode the data into the proper type
+                v := dataVal.MapIndex(k).Interface()
+                currentVal := reflect.Indirect(reflect.New(valElemType))
+                if err := d.decode(fieldName, v, currentVal); err != nil {
+                        errors = appendErrors(errors, err)
+                        continue
+                }
+
+                valMap.SetMapIndex(currentKey, currentVal)
+        }
+
+        // Set the built up map to the value
+        val.Set(valMap)
+
+        // If we had errors, return those
+        if len(errors) > 0 {
+                return &Error{errors}
+        }
+
+        return nil
+}
+
+func (d *Decoder) decodePtr(name string, data interface{}, val reflect.Value) error {
+        // Create an element of the concrete (non pointer) type and decode
+        // into that. Then set the value of the pointer to this type.
+        valType := val.Type()
+        valElemType := valType.Elem()
+
+        realVal := val
+        if realVal.IsNil() || d.config.ZeroFields {
+                realVal = reflect.New(valElemType)
+        }
+
+        if err := d.decode(name, data, reflect.Indirect(realVal)); err != nil {
+                return err
+        }
+
+        val.Set(realVal)
+        return nil
+}
+
+func (d *Decoder) decodeFunc(name string, data interface{}, val reflect.Value) error {
+        // Create an element of the concrete (non pointer) type and decode
+        // into that. Then set the value of the pointer to this type.
+        dataVal := reflect.Indirect(reflect.ValueOf(data))
+        if val.Type() != dataVal.Type() {
+                return fmt.Errorf(
+                        "'%s' expected type '%s', got unconvertible type '%s'",
+                        name, val.Type(), dataVal.Type())
+        }
+        val.Set(dataVal)
+        return nil
+}
+
+func (d *Decoder) decodeSlice(name string, data interface{}, val reflect.Value) error {
+        dataVal := reflect.Indirect(reflect.ValueOf(data))
+        dataValKind := dataVal.Kind()
+        valType := val.Type()
+        valElemType := valType.Elem()
+        sliceType := reflect.SliceOf(valElemType)
+
+        valSlice := val
+        if valSlice.IsNil() || d.config.ZeroFields {
+                // Check input type
+                if dataValKind != reflect.Array && dataValKind != reflect.Slice {
+                        if d.config.WeaklyTypedInput {
+                                switch {
+                                // Empty maps turn into empty slices
+                                case dataValKind == reflect.Map:
+                                        if dataVal.Len() == 0 {
+                                                val.Set(reflect.MakeSlice(sliceType, 0, 0))
+                                                return nil
+                                        }
+
+                                // All other types we try to convert to the slice type
+                                // and "lift" it into it. i.e. a string becomes a string slice.
+                                default:
+                                        // Just re-try this function with data as a slice.
+                                        return d.decodeSlice(name, []interface{}{data}, val)
+                                }
+                        }
+
+                        return fmt.Errorf(
+                                "'%s': source data must be an array or slice, got %s", name, dataValKind)
+
+                }
+
+                // Make a new slice to hold our result, same size as the original data.
+                valSlice = reflect.MakeSlice(sliceType, dataVal.Len(), dataVal.Len())
+        }
+
+        // Accumulate any errors
+        errors := make([]string, 0)
+
+        for i := 0; i < dataVal.Len(); i++ {
+                currentData := dataVal.Index(i).Interface()
+                for valSlice.Len() <= i {
+                        valSlice = reflect.Append(valSlice, reflect.Zero(valElemType))
+                }
+                currentField := valSlice.Index(i)
+
+                fieldName := fmt.Sprintf("%s[%d]", name, i)
+                if err := d.decode(fieldName, currentData, currentField); err != nil {
+                        errors = appendErrors(errors, err)
+                }
+        }
+
+        // Finally, set the value to the slice we built up
+        val.Set(valSlice)
+
+        // If there were errors, we return those
+        if len(errors) > 0 {
+                return &Error{errors}
+        }
+
+        return nil
+}
+
+func (d *Decoder) decodeStruct(name string, data interface{}, val reflect.Value) error {
+        dataVal := reflect.Indirect(reflect.ValueOf(data))
+
+        // If the type of the value to write to and the data match directly,
+        // then we just set it directly instead of recursing into the structure.
+        if dataVal.Type() == val.Type() {
+                val.Set(dataVal)
+                return nil
+        }
+
+        dataValKind := dataVal.Kind()
+        if dataValKind != reflect.Map {
+                return fmt.Errorf("'%s' expected a map, got '%s'", name, dataValKind)
+        }
+
+        dataValType := dataVal.Type()
+        if kind := dataValType.Key().Kind(); kind != reflect.String && kind != reflect.Interface {
+                return fmt.Errorf(
+                        "'%s' needs a map with string keys, has '%s' keys",
+                        name, dataValType.Key().Kind())
+        }
+
+        dataValKeys := make(map[reflect.Value]struct{})
+        dataValKeysUnused := make(map[interface{}]struct{})
+        for _, dataValKey := range dataVal.MapKeys() {
+                dataValKeys[dataValKey] = struct{}{}
+                dataValKeysUnused[dataValKey.Interface()] = struct{}{}
+        }
+
+        errors := make([]string, 0)
+
+        // This slice will keep track of all the structs we'll be decoding.
+        // There can be more than one struct if there are embedded structs
+        // that are squashed.
+        structs := make([]reflect.Value, 1, 5)
+        structs[0] = val
+
+        // Compile the list of all the fields that we're going to be decoding
+        // from all the structs.
+        fields := make(map[*reflect.StructField]reflect.Value)
+        for len(structs) > 0 {
+                structVal := structs[0]
+                structs = structs[1:]
+
+                structType := structVal.Type()
+
+                for i := 0; i < structType.NumField(); i++ {
+                        fieldType := structType.Field(i)
+                        fieldKind := fieldType.Type.Kind()
+
+                        // If "squash" is specified in the tag, we squash the field down.
+                        squash := false
+                        tagParts := strings.Split(fieldType.Tag.Get(d.config.TagName), ",")
+                        for _, tag := range tagParts[1:] {
+                                if tag == "squash" {
+                                        squash = true
+                                        break
+                                }
+                        }
+
+                        if squash {
+                                if fieldKind != reflect.Struct {
+                                        errors = appendErrors(errors,
+                                                fmt.Errorf("%s: unsupported type for squash: %s", fieldType.Name, fieldKind))
+                                } else {
+                                        structs = append(structs, val.FieldByName(fieldType.Name))
+                                }
+                                continue
+                        }
+
+                        // Normal struct field, store it away
+                        fields[&fieldType] = structVal.Field(i)
+                }
+        }
+
+        for fieldType, field := range fields {
+                fieldName := fieldType.Name
+
+                tagValue := fieldType.Tag.Get(d.config.TagName)
+                tagValue = strings.SplitN(tagValue, ",", 2)[0]
+                if tagValue != "" {
+                        fieldName = tagValue
+                }
+
+                rawMapKey := reflect.ValueOf(fieldName)
+                rawMapVal := dataVal.MapIndex(rawMapKey)
+                if !rawMapVal.IsValid() {
+                        // Do a slower search by iterating over each key and
+                        // doing case-insensitive search.
+                        for dataValKey := range dataValKeys {
+                                mK, ok := dataValKey.Interface().(string)
+                                if !ok {
+                                        // Not a string key
+                                        continue
+                                }
+
+                                if strings.EqualFold(mK, fieldName) {
+                                        rawMapKey = dataValKey
+                                        rawMapVal = dataVal.MapIndex(dataValKey)
+                                        break
+                                }
+                        }
+
+                        if !rawMapVal.IsValid() {
+                                // There was no matching key in the map for the value in
+                                // the struct. Just ignore.
+                                continue
+                        }
+                }
+
+                // Delete the key we're using from the unused map so we stop tracking
+                delete(dataValKeysUnused, rawMapKey.Interface())
+
+                if !field.IsValid() {
+                        // This should never happen
+                        panic("field is not valid")
+                }
+
+                // If we can't set the field, then it is unexported or something,
+                // and we just continue onwards.
+                if !field.CanSet() {
+                        continue
+                }
+
+                // 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)
+                }
+
+                if err := d.decode(fieldName, rawMapVal.Interface(), field); err != nil {
+                        errors = appendErrors(errors, err)
+                }
+        }
+
+        if d.config.ErrorUnused && len(dataValKeysUnused) > 0 {
+                keys := make([]string, 0, len(dataValKeysUnused))
+                for rawKey := range dataValKeysUnused {
+                        keys = append(keys, rawKey.(string))
+                }
+                sort.Strings(keys)
+
+                err := fmt.Errorf("'%s' has invalid keys: %s", name, strings.Join(keys, ", "))
+                errors = appendErrors(errors, err)
+        }
+
+        if len(errors) > 0 {
+                return &Error{errors}
+        }
+
+        // Add the unused keys to the list of unused keys if we're tracking metadata
+        if d.config.Metadata != nil {
+                for rawKey := range dataValKeysUnused {
+                        key := rawKey.(string)
+                        if name != "" {
+                                key = fmt.Sprintf("%s.%s", name, key)
+                        }
+
+                        d.config.Metadata.Unused = append(d.config.Metadata.Unused, key)
+                }
+        }
+
+        return nil
+}
+
+func getKind(val reflect.Value) reflect.Kind {
+        kind := val.Kind()
+
+        switch {
+        case kind >= reflect.Int && kind <= reflect.Int64:
+                return reflect.Int
+        case kind >= reflect.Uint && kind <= reflect.Uint64:
+                return reflect.Uint
+        case kind >= reflect.Float32 && kind <= reflect.Float64:
+                return reflect.Float32
+        default:
+                return kind
+        }
+}