Vendor exoscale-import plugin

This change will vendor the new version of the exoscale-import
post-processor component, but remove all of its code from Packer. After
the v1.8.0 release this change should be removed entirely.

This vendor process is being used as a workaround for decoupling the
exoscale-import component without causing a breaking change in Packer.

Users of Exoscale are encouraged to leverage `packer init` for
installing the latest version of packer-plugin-exoscale.

vendor/github.com/deepmap/oapi-codegen/pkg/runtime/bindstring.go

@@ -0,0 +1,143 @@
+// Copyright 2019 DeepMap, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package runtime
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strconv"
+	"time"
+
+	"github.com/deepmap/oapi-codegen/pkg/types"
+)
+
+// This function takes a string, and attempts to assign it to the destination
+// interface via whatever type conversion is necessary. We have to do this
+// via reflection instead of a much simpler type switch so that we can handle
+// type aliases. This function was the easy way out, the better way, since we
+// know the destination type each place that we use this, is to generate code
+// to read each specific type.
+func BindStringToObject(src string, dst interface{}) error {
+	var err error
+
+	v := reflect.ValueOf(dst)
+	t := reflect.TypeOf(dst)
+
+	// We need to dereference pointers
+	if t.Kind() == reflect.Ptr {
+		v = reflect.Indirect(v)
+		t = v.Type()
+	}
+
+	// The resulting type must be settable. reflect will catch issues like
+	// passing the destination by value.
+	if !v.CanSet() {
+		return errors.New("destination is not settable")
+	}
+
+	switch t.Kind() {
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		var val int64
+		val, err = strconv.ParseInt(src, 10, 64)
+		if err == nil {
+			v.SetInt(val)
+		}
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		var val uint64
+		val, err = strconv.ParseUint(src, 10, 64)
+		if err == nil {
+			v.SetUint(val)
+		}
+	case reflect.String:
+		v.SetString(src)
+		err = nil
+	case reflect.Float64, reflect.Float32:
+		var val float64
+		val, err = strconv.ParseFloat(src, 64)
+		if err == nil {
+			v.SetFloat(val)
+		}
+	case reflect.Bool:
+		var val bool
+		val, err = strconv.ParseBool(src)
+		if err == nil {
+			v.SetBool(val)
+		}
+	case reflect.Struct:
+		// if this is not of type Time or of type Date look to see if this is of type Binder.
+		if dstType, ok := dst.(Binder); ok {
+			return dstType.Bind(src)
+		}
+
+		if t.ConvertibleTo(reflect.TypeOf(time.Time{})) {
+			// Don't fail on empty string.
+			if src == "" {
+				return nil
+			}
+			// Time is a special case of a struct that we handle
+			parsedTime, err := time.Parse(time.RFC3339Nano, src)
+			if err != nil {
+				parsedTime, err = time.Parse(types.DateFormat, src)
+				if err != nil {
+					return fmt.Errorf("error parsing '%s' as RFC3339 or 2006-01-02 time: %s", src, err)
+				}
+			}
+			// So, assigning this gets a little fun. We have a value to the
+			// dereference destination. We can't do a conversion to
+			// time.Time because the result isn't assignable, so we need to
+			// convert pointers.
+			if t != reflect.TypeOf(time.Time{}) {
+				vPtr := v.Addr()
+				vtPtr := vPtr.Convert(reflect.TypeOf(&time.Time{}))
+				v = reflect.Indirect(vtPtr)
+			}
+			v.Set(reflect.ValueOf(parsedTime))
+			return nil
+		}
+
+		if t.ConvertibleTo(reflect.TypeOf(types.Date{})) {
+			// Don't fail on empty string.
+			if src == "" {
+				return nil
+			}
+			parsedTime, err := time.Parse(types.DateFormat, src)
+			if err != nil {
+				return fmt.Errorf("error parsing '%s' as date: %s", src, err)
+			}
+			parsedDate := types.Date{Time: parsedTime}
+
+			// We have to do the same dance here to assign, just like with times
+			// above.
+			if t != reflect.TypeOf(types.Date{}) {
+				vPtr := v.Addr()
+				vtPtr := vPtr.Convert(reflect.TypeOf(&types.Date{}))
+				v = reflect.Indirect(vtPtr)
+			}
+			v.Set(reflect.ValueOf(parsedDate))
+			return nil
+		}
+
+		// We fall through to the error case below if we haven't handled the
+		// destination type above.
+		fallthrough
+	default:
+		// We've got a bunch of types unimplemented, don't fail silently.
+		err = fmt.Errorf("can not bind to destination of type: %s", t.Kind())
+	}
+	if err != nil {
+		return fmt.Errorf("error binding string parameter: %s", err)
+	}
+	return nil
+}