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|
package http
import (
"context"
"fmt"
"github.com/aws/smithy-go/middleware"
)
type isContentTypeAutoSet struct{}
// SetIsContentTypeDefaultValue returns a Context specifying if the request's
// content-type header was set to a default value.
func SetIsContentTypeDefaultValue(ctx context.Context, isDefault bool) context.Context {
return context.WithValue(ctx, isContentTypeAutoSet{}, isDefault)
}
// GetIsContentTypeDefaultValue returns if the content-type HTTP header on the
// request is a default value that was auto assigned by an operation
// serializer. Allows middleware post serialization to know if the content-type
// was auto set to a default value or not.
//
// Also returns false if the Context value was never updated to include if
// content-type was set to a default value.
func GetIsContentTypeDefaultValue(ctx context.Context) bool {
v, _ := ctx.Value(isContentTypeAutoSet{}).(bool)
return v
}
// AddNoPayloadDefaultContentTypeRemover Adds the DefaultContentTypeRemover
// middleware to the stack after the operation serializer. This middleware will
// remove the content-type header from the request if it was set as a default
// value, and no request payload is present.
//
// Returns error if unable to add the middleware.
func AddNoPayloadDefaultContentTypeRemover(stack *middleware.Stack) (err error) {
err = stack.Serialize.Insert(removeDefaultContentType{},
"OperationSerializer", middleware.After)
if err != nil {
return fmt.Errorf("failed to add %s serialize middleware, %w",
removeDefaultContentType{}.ID(), err)
}
return nil
}
// RemoveNoPayloadDefaultContentTypeRemover removes the
// DefaultContentTypeRemover middleware from the stack. Returns an error if
// unable to remove the middleware.
func RemoveNoPayloadDefaultContentTypeRemover(stack *middleware.Stack) (err error) {
_, err = stack.Serialize.Remove(removeDefaultContentType{}.ID())
if err != nil {
return fmt.Errorf("failed to remove %s serialize middleware, %w",
removeDefaultContentType{}.ID(), err)
}
return nil
}
// removeDefaultContentType provides after serialization middleware that will
// remove the content-type header from an HTTP request if the header was set as
// a default value by the operation serializer, and there is no request payload.
type removeDefaultContentType struct{}
// ID returns the middleware ID
func (removeDefaultContentType) ID() string { return "RemoveDefaultContentType" }
// HandleSerialize implements the serialization middleware.
func (removeDefaultContentType) HandleSerialize(
ctx context.Context, input middleware.SerializeInput, next middleware.SerializeHandler,
) (
out middleware.SerializeOutput, meta middleware.Metadata, err error,
) {
req, ok := input.Request.(*Request)
if !ok {
return out, meta, fmt.Errorf(
"unexpected request type %T for removeDefaultContentType middleware",
input.Request)
}
if GetIsContentTypeDefaultValue(ctx) && req.GetStream() == nil {
req.Header.Del("Content-Type")
input.Request = req
}
return next.HandleSerialize(ctx, input)
}
type headerValue struct {
header string
value string
append bool
}
type headerValueHelper struct {
headerValues []headerValue
}
func (h *headerValueHelper) addHeaderValue(value headerValue) {
h.headerValues = append(h.headerValues, value)
}
func (h *headerValueHelper) ID() string {
return "HTTPHeaderHelper"
}
func (h *headerValueHelper) HandleBuild(ctx context.Context, in middleware.BuildInput, next middleware.BuildHandler) (out middleware.BuildOutput, metadata middleware.Metadata, err error) {
req, ok := in.Request.(*Request)
if !ok {
return out, metadata, fmt.Errorf("unknown transport type %T", in.Request)
}
for _, value := range h.headerValues {
if value.append {
req.Header.Add(value.header, value.value)
} else {
req.Header.Set(value.header, value.value)
}
}
return next.HandleBuild(ctx, in)
}
func getOrAddHeaderValueHelper(stack *middleware.Stack) (*headerValueHelper, error) {
id := (*headerValueHelper)(nil).ID()
m, ok := stack.Build.Get(id)
if !ok {
m = &headerValueHelper{}
err := stack.Build.Add(m, middleware.After)
if err != nil {
return nil, err
}
}
requestUserAgent, ok := m.(*headerValueHelper)
if !ok {
return nil, fmt.Errorf("%T for %s middleware did not match expected type", m, id)
}
return requestUserAgent, nil
}
// AddHeaderValue returns a stack mutator that adds the header value pair to header.
// Appends to any existing values if present.
func AddHeaderValue(header string, value string) func(stack *middleware.Stack) error {
return func(stack *middleware.Stack) error {
helper, err := getOrAddHeaderValueHelper(stack)
if err != nil {
return err
}
helper.addHeaderValue(headerValue{header: header, value: value, append: true})
return nil
}
}
// SetHeaderValue returns a stack mutator that adds the header value pair to header.
// Replaces any existing values if present.
func SetHeaderValue(header string, value string) func(stack *middleware.Stack) error {
return func(stack *middleware.Stack) error {
helper, err := getOrAddHeaderValueHelper(stack)
if err != nil {
return err
}
helper.addHeaderValue(headerValue{header: header, value: value, append: false})
return nil
}
}
|
