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package rest
import (
"bytes"
"encoding/base64"
"fmt"
"io"
"net/url"
"path"
"reflect"
"strconv"
"strings"
"time"
"github.com/awslabs/aws-sdk-go/aws"
)
// RFC822 returns an RFC822 formatted timestamp for AWS protocols
const RFC822 = "Mon, 2 Jan 2006 15:04:05 GMT"
func Build(r *aws.Request) {
if r.ParamsFilled() {
v := reflect.ValueOf(r.Params).Elem()
buildLocationElements(r, v)
buildBody(r, v)
}
}
func buildLocationElements(r *aws.Request, v reflect.Value) {
query := r.HTTPRequest.URL.Query()
for i := 0; i < v.NumField(); i++ {
m := v.Field(i)
if n := v.Type().Field(i).Name; n[0:1] == strings.ToLower(n[0:1]) {
continue
}
if m.IsValid() {
field := v.Type().Field(i)
name := field.Tag.Get("locationName")
if name == "" {
name = field.Name
}
if m.Kind() == reflect.Ptr {
m = m.Elem()
}
if !m.IsValid() {
continue
}
switch field.Tag.Get("location") {
case "headers": // header maps
buildHeaderMap(r, m, field.Tag.Get("locationName"))
case "header":
buildHeader(r, m, name)
case "uri":
buildURI(r, m, name)
case "querystring":
buildQueryString(r, m, name, query)
}
}
if r.Error != nil {
return
}
}
r.HTTPRequest.URL.RawQuery = query.Encode()
updatePath(r.HTTPRequest.URL, r.HTTPRequest.URL.Path)
}
func buildBody(r *aws.Request, v reflect.Value) {
if field, ok := v.Type().FieldByName("SDKShapeTraits"); ok {
if payloadName := field.Tag.Get("payload"); payloadName != "" {
pfield, _ := v.Type().FieldByName(payloadName)
if ptag := pfield.Tag.Get("type"); ptag != "" && ptag != "structure" {
payload := reflect.Indirect(v.FieldByName(payloadName))
if payload.IsValid() && payload.Interface() != nil {
switch reader := payload.Interface().(type) {
case io.ReadSeeker:
r.SetReaderBody(reader)
case []byte:
r.SetBufferBody(reader)
case string:
r.SetBufferBody([]byte(reader))
default:
r.Error = fmt.Errorf("unknown payload type %s", payload.Type())
}
}
}
}
}
}
func buildHeader(r *aws.Request, v reflect.Value, name string) {
str, err := convertType(v)
if err != nil {
r.Error = err
} else if str != nil {
r.HTTPRequest.Header.Add(name, *str)
}
}
func buildHeaderMap(r *aws.Request, v reflect.Value, prefix string) {
for _, key := range v.MapKeys() {
str, err := convertType(v.MapIndex(key))
if err != nil {
r.Error = err
} else if str != nil {
r.HTTPRequest.Header.Add(prefix+key.String(), *str)
}
}
}
func buildURI(r *aws.Request, v reflect.Value, name string) {
value, err := convertType(v)
if err != nil {
r.Error = err
} else if value != nil {
uri := r.HTTPRequest.URL.Path
uri = strings.Replace(uri, "{"+name+"}", escapePath(*value, true), -1)
uri = strings.Replace(uri, "{"+name+"+}", escapePath(*value, false), -1)
r.HTTPRequest.URL.Path = uri
}
}
func buildQueryString(r *aws.Request, v reflect.Value, name string, query url.Values) {
str, err := convertType(v)
if err != nil {
r.Error = err
} else if str != nil {
query.Set(name, *str)
}
}
func updatePath(url *url.URL, urlPath string) {
scheme, query := url.Scheme, url.RawQuery
// clean up path
urlPath = path.Clean(urlPath)
// get formatted URL minus scheme so we can build this into Opaque
url.Scheme, url.Path, url.RawQuery = "", "", ""
s := url.String()
url.Scheme = scheme
url.RawQuery = query
// build opaque URI
url.Opaque = s + urlPath
}
// Whether the byte value can be sent without escaping in AWS URLs
var noEscape [256]bool
var noEscapeInitialized = false
// initialise noEscape
func initNoEscape() {
for i := range noEscape {
// Amazon expects every character except these escaped
noEscape[i] = (i >= 'A' && i <= 'Z') ||
(i >= 'a' && i <= 'z') ||
(i >= '0' && i <= '9') ||
i == '-' ||
i == '.' ||
i == '_' ||
i == '~'
}
}
// escapePath escapes part of a URL path in Amazon style
func escapePath(path string, encodeSep bool) string {
if !noEscapeInitialized {
initNoEscape()
noEscapeInitialized = true
}
var buf bytes.Buffer
for i := 0; i < len(path); i++ {
c := path[i]
if noEscape[c] || (c == '/' && !encodeSep) {
buf.WriteByte(c)
} else {
buf.WriteByte('%')
buf.WriteString(strings.ToUpper(strconv.FormatUint(uint64(c), 16)))
}
}
return buf.String()
}
func convertType(v reflect.Value) (*string, error) {
v = reflect.Indirect(v)
if !v.IsValid() {
return nil, nil
}
var str string
switch value := v.Interface().(type) {
case string:
str = value
case []byte:
str = base64.StdEncoding.EncodeToString(value)
case bool:
str = strconv.FormatBool(value)
case int64:
str = strconv.FormatInt(value, 10)
case float64:
str = strconv.FormatFloat(value, 'f', -1, 64)
case time.Time:
str = value.UTC().Format(RFC822)
default:
err := fmt.Errorf("Unsupported value for param %v (%s)", v.Interface(), v.Type())
return nil, err
}
return &str, nil
}
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