/
object_server.go
81 lines (68 loc) · 1.61 KB
/
object_server.go
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package memebot
import (
"errors"
"fmt"
"io"
"log"
"net/http"
"net/url"
"time"
"github.com/gorilla/mux"
)
var ErrObjectIdNotFound = errors.New("object id not found")
type ReadSeekerCloser interface {
io.Reader
io.Seeker
io.Closer
}
type Object interface {
Open() (ReadSeekerCloser, error)
LastModified() time.Time
Size() int64
}
type ObjectRepository interface {
FindObject(id string) (Object, bool)
}
type ObjectServer struct {
repository ObjectRepository
route *mux.Route
}
func CreateObjectServer(router *mux.Router, repository ObjectRepository) *ObjectServer {
server := &ObjectServer{
repository: repository,
}
server.route = router.Path("/{id}").HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
vars := mux.Vars(req)
id := vars["id"]
if id == "" {
log.Println("bad request: no ID specified")
http.Error(w, "no ID specified", http.StatusBadRequest)
return
}
object, found := repository.FindObject(id)
if !found {
err := fmt.Errorf("id not found: %s", id)
log.Printf(err.Error())
http.NotFound(w, req)
return
}
data, err := object.Open()
if err != nil {
err := fmt.Sprintf("error opening object %s: %s", id, err)
log.Printf(err)
http.Error(w, err, http.StatusInternalServerError)
return
}
defer data.Close()
log.Printf("loaded object id: %s (%d bytes)", id, object.Size())
http.ServeContent(w, req, id, object.LastModified(), data)
})
return server
}
func (s *ObjectServer) URL(id string) *url.URL {
url, err := s.route.URL("id", id)
if err != nil {
panic(fmt.Errorf("error creating URL for id %s: %s", id, err))
}
return url
}