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126 lines
3.4 KiB
126 lines
3.4 KiB
package http
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import (
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"io/ioutil"
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"net/http"
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"github.com/go-kratos/kratos/v2/encoding"
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"github.com/go-kratos/kratos/v2/encoding/json"
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xhttp "github.com/go-kratos/kratos/v2/internal/http"
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"github.com/go-kratos/kratos/v2/middleware"
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"github.com/go-kratos/kratos/v2/transport/http/binding"
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"google.golang.org/grpc/status"
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"google.golang.org/protobuf/encoding/protojson"
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)
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// SupportPackageIsVersion1 These constants should not be referenced from any other code.
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const SupportPackageIsVersion1 = true
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// DecodeRequestFunc is decode request func.
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type DecodeRequestFunc func(*http.Request, interface{}) error
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// EncodeResponseFunc is encode response func.
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type EncodeResponseFunc func(http.ResponseWriter, *http.Request, interface{}) error
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// EncodeErrorFunc is encode error func.
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type EncodeErrorFunc func(http.ResponseWriter, *http.Request, error)
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// HandleOption is handle option.
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type HandleOption func(*HandleOptions)
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// HandleOptions is handle options.
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type HandleOptions struct {
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Decode DecodeRequestFunc
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Encode EncodeResponseFunc
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Error EncodeErrorFunc
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Middleware middleware.Middleware
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}
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// DefaultHandleOptions returns a default handle options.
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func DefaultHandleOptions() HandleOptions {
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return HandleOptions{
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Decode: decodeRequest,
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Encode: encodeResponse,
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Error: encodeError,
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}
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}
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// RequestDecoder with request decoder.
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func RequestDecoder(dec DecodeRequestFunc) HandleOption {
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return func(o *HandleOptions) {
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o.Decode = dec
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}
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}
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// ResponseEncoder with response encoder.
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func ResponseEncoder(en EncodeResponseFunc) HandleOption {
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return func(o *HandleOptions) {
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o.Encode = en
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}
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}
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// ErrorEncoder with error encoder.
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func ErrorEncoder(en EncodeErrorFunc) HandleOption {
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return func(o *HandleOptions) {
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o.Error = en
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}
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}
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// Middleware with middleware option.
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func Middleware(m ...middleware.Middleware) HandleOption {
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return func(o *HandleOptions) {
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o.Middleware = middleware.Chain(m...)
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}
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}
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// decodeRequest decodes the request body to object.
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func decodeRequest(req *http.Request, v interface{}) error {
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subtype := xhttp.ContentSubtype(req.Header.Get(xhttp.HeaderContentType))
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if codec := encoding.GetCodec(subtype); codec != nil {
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data, err := ioutil.ReadAll(req.Body)
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if err != nil {
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return err
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}
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return codec.Unmarshal(data, v)
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}
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return binding.BindForm(req, v)
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}
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// encodeResponse encodes the object to the HTTP response.
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func encodeResponse(w http.ResponseWriter, r *http.Request, v interface{}) error {
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codec := codecForRequest(r)
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data, err := codec.Marshal(v)
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if err != nil {
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return err
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}
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w.Header().Set(xhttp.HeaderContentType, xhttp.ContentType(codec.Name()))
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_, _ = w.Write(data)
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return nil
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}
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// encodeError encodes the error to the HTTP response.
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func encodeError(w http.ResponseWriter, r *http.Request, err error) {
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st, _ := status.FromError(err)
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data, err := protojson.Marshal(st.Proto())
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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w.Header().Set(xhttp.HeaderContentType, "application/json; charset=utf-8")
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w.WriteHeader(xhttp.StatusFromGRPCCode(st.Code()))
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w.Write(data)
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}
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// codecForRequest get encoding.Codec via http.Request
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func codecForRequest(r *http.Request) encoding.Codec {
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var codec encoding.Codec
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for _, accept := range r.Header[xhttp.HeaderAccept] {
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if codec = encoding.GetCodec(xhttp.ContentSubtype(accept)); codec != nil {
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break
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}
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}
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if codec == nil {
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codec = encoding.GetCodec(json.Name)
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}
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return codec
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}
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