/
handler.go
70 lines (63 loc) · 1.6 KB
/
handler.go
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package request
import (
"errors"
"fmt"
"net/http"
"github.com/jfbus/impressionist/config"
ctxt "github.com/jfbus/impressionist/context"
"github.com/jfbus/impressionist/filter"
"github.com/jfbus/impressionist/provider"
"github.com/jfbus/impressionist/storage"
"golang.org/x/net/context"
)
var (
ErrBadRequest = errors.New("bad request)")
)
func Display(w http.ResponseWriter, req *http.Request) {
cfg := config.Get()
ctx, cancel := context.WithTimeout(ctxt.New(req), cfg.Http.TimeOut)
defer cancel()
r, err := ParseRequest(ctx, req.URL.Query(), req.URL.Path)
if err != nil {
Error(err, w)
return
}
i, err := storage.Read(r.Storage, r.File)
if err != nil {
Error(err, w)
return
}
i, err = Work(Job{Ctx: ctx, Image: i, FilterChain: r.FilterChain})
if err == nil {
writer := provider.GetWriter(r.Format)
if writer == nil {
Error(ErrBadRequest, w)
return
}
err = writer.Write(i, r.Quality, w)
}
if err != nil {
Error(err, w)
}
}
func Error(err error, w http.ResponseWriter) {
switch err {
case storage.ErrStorageNotFound:
w.WriteHeader(http.StatusNotFound)
case storage.ErrFileNotFound:
w.WriteHeader(http.StatusNotFound)
case storage.ErrAccessDenied:
w.WriteHeader(http.StatusForbidden)
case filter.ErrFilterNotFound:
w.WriteHeader(http.StatusBadRequest)
case filter.ErrBadFilterParameter:
w.WriteHeader(http.StatusBadRequest)
case filter.ErrMissingFilterParameter:
w.WriteHeader(http.StatusBadRequest)
case ErrBadRequest:
w.WriteHeader(http.StatusBadRequest)
default:
w.WriteHeader(http.StatusServiceUnavailable)
}
w.Write([]byte(fmt.Sprintf("%s", err)))
}