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put.go
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put.go
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package readinglist
import (
"context"
"encoding/json"
"io/ioutil"
"net/http"
"strings"
ocontext "golang.org/x/net/context"
"github.com/NYTimes/gizmo/server/kit"
"github.com/golang/protobuf/proto"
)
// gRPC stub
func (s service) PutLink(ctx ocontext.Context, r *PutLinkRequest) (*Message, error) {
res, err := s.putLink(ctx, r)
if err != nil {
return nil, err
}
return res.(*Message), nil
}
// go-kit endpoint.Endpoint with core business logic
func (s service) putLink(ctx context.Context, req interface{}) (interface{}, error) {
r := req.(*PutLinkRequest)
// validate the request
if !strings.HasPrefix(r.Request.Link.Url, "https://www.nytimes.com/") {
return nil, kit.NewJSONStatusResponse(
&Message{"only https://www.nytimes.com URLs accepted"},
http.StatusBadRequest)
}
var err error
// call the service-injected DB interface
if r.Request.Delete {
err = s.db.DeleteLink(ctx, getUser(ctx), r.Request.Link.Url)
} else {
err = s.db.PutLink(ctx, getUser(ctx), r.Request.Link.Url)
}
if err != nil {
return nil, kit.NewJSONStatusResponse(
&Message{"problems updating link"},
http.StatusInternalServerError)
}
return &Message{Message: "success"}, nil
}
// JSON request decoder
func decodePutRequest(ctx context.Context, r *http.Request) (interface{}, error) {
var lr LinkRequest
err := json.NewDecoder(r.Body).Decode(&lr)
if err != nil || lr.Link == nil {
return nil, kit.NewJSONStatusResponse(
&Message{Message: "bad request"},
http.StatusBadRequest)
}
return &PutLinkRequest{
Request: &lr}, nil
}
// Protobuf request decoder
func decodePutProtoRequest(ctx context.Context, r *http.Request) (interface{}, error) {
b, err := ioutil.ReadAll(r.Body)
if err != nil {
return nil, kit.NewJSONStatusResponse(
&Message{Message: "unable to read request"},
http.StatusBadRequest)
}
var lr LinkRequest
err = proto.Unmarshal(b, &lr)
if err != nil {
return nil, kit.NewJSONStatusResponse(
&Message{Message: "bad request"},
http.StatusBadRequest)
}
return &PutLinkRequest{
Request: &lr}, nil
}