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package queryutil
import (
"encoding/base64"
"fmt"
"net/url"
"reflect"
"sort"
"strconv"
"strings"
"time"
)
func Parse(body url.Values, i interface{}, isEC2 bool) error {
q := queryParser{isEC2: isEC2}
return q.parseValue(body, reflect.ValueOf(i), "", "")
}
func elemOf(value reflect.Value) reflect.Value {
for value.Kind() == reflect.Ptr {
value = value.Elem()
}
return value
}
type queryParser struct {
isEC2 bool
}
func (q *queryParser) parseValue(v url.Values, value reflect.Value, prefix string, tag reflect.StructTag) error {
value = elemOf(value)
// no need to handle zero values
if !value.IsValid() {
return nil
}
t := tag.Get("type")
if t == "" {
switch value.Kind() {
case reflect.Struct:
t = "structure"
case reflect.Slice:
t = "list"
case reflect.Map:
t = "map"
}
}
switch t {
case "structure":
return q.parseStruct(v, value, prefix)
case "list":
return q.parseList(v, value, prefix, tag)
case "map":
return q.parseMap(v, value, prefix, tag)
default:
return q.parseScalar(v, value, prefix, tag)
}
}
func (q *queryParser) parseStruct(v url.Values, value reflect.Value, prefix string) error {
if !value.IsValid() {
return nil
}
t := value.Type()
for i := 0; i < value.NumField(); i++ {
if c := t.Field(i).Name[0:1]; strings.ToLower(c) == c {
continue // ignore unexported fields
}
value := elemOf(value.Field(i))
field := t.Field(i)
var name string
if q.isEC2 {
name = field.Tag.Get("queryName")
}
if name == "" {
if field.Tag.Get("flattened") != "" && field.Tag.Get("locationNameList") != "" {
name = field.Tag.Get("locationNameList")
} else if locName := field.Tag.Get("locationName"); locName != "" {
name = locName
}
if name != "" && q.isEC2 {
name = strings.ToUpper(name[0:1]) + name[1:]
}
}
if name == "" {
name = field.Name
}
if prefix != "" {
name = prefix + "." + name
}
if err := q.parseValue(v, value, name, field.Tag); err != nil {
return err
}
}
return nil
}
func (q *queryParser) parseList(v url.Values, value reflect.Value, prefix string, tag reflect.StructTag) error {
// check for unflattened list member
if !q.isEC2 && tag.Get("flattened") == "" {
prefix += ".member"
}
for i := 0; i < value.Len(); i++ {
slicePrefix := prefix
if slicePrefix == "" {
slicePrefix = strconv.Itoa(i + 1)
} else {
slicePrefix = slicePrefix + "." + strconv.Itoa(i+1)
}
if err := q.parseValue(v, value.Index(i), slicePrefix, ""); err != nil {
return err
}
}
return nil
}
func (q *queryParser) parseMap(v url.Values, value reflect.Value, prefix string, tag reflect.StructTag) error {
// check for unflattened list member
if !q.isEC2 && tag.Get("flattened") == "" {
prefix += ".entry"
}
// sort keys for improved serialization consistency.
// this is not strictly necessary for protocol support.
mapKeyValues := value.MapKeys()
mapKeys := map[string]reflect.Value{}
mapKeyNames := make([]string, len(mapKeyValues))
for i, mapKey := range mapKeyValues {
name := mapKey.String()
mapKeys[name] = mapKey
mapKeyNames[i] = name
}
sort.Strings(mapKeyNames)
for i, mapKeyName := range mapKeyNames {
mapKey := mapKeys[mapKeyName]
mapValue := value.MapIndex(mapKey)
// serialize key
var keyName string
if prefix == "" {
keyName = strconv.Itoa(i+1) + ".key"
} else {
keyName = prefix + "." + strconv.Itoa(i+1) + ".key"
}
if err := q.parseValue(v, mapKey, keyName, ""); err != nil {
return err
}
// serialize value
var valueName string
if prefix == "" {
valueName = strconv.Itoa(i+1) + ".value"
} else {
valueName = prefix + "." + strconv.Itoa(i+1) + ".value"
}
if err := q.parseValue(v, mapValue, valueName, ""); err != nil {
return err
}
}
return nil
}
func (q *queryParser) parseScalar(v url.Values, r reflect.Value, name string, tag reflect.StructTag) error {
switch value := r.Interface().(type) {
case string:
v.Set(name, value)
case []byte:
v.Set(name, base64.StdEncoding.EncodeToString(value))
case bool:
v.Set(name, strconv.FormatBool(value))
case int64:
v.Set(name, strconv.FormatInt(value, 10))
case int:
v.Set(name, strconv.Itoa(value))
case float64:
v.Set(name, strconv.FormatFloat(value, 'f', -1, 64))
case float32:
v.Set(name, strconv.FormatFloat(float64(value), 'f', -1, 32))
case time.Time:
const ISO8601UTC = "2006-01-02T15:04:05Z"
v.Set(name, value.UTC().Format(ISO8601UTC))
default:
return fmt.Errorf("unsupported value for param %s: %v (%s)", name, r.Interface(), r.Type().Name())
}
return nil
}
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