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resource.go
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resource.go
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// Package resource provides data transfer objects for NVGD's protocol and
// filters.
package resource
import (
"bytes"
"io"
"path"
"strings"
"github.com/koron/nvgd/internal/commonconst"
)
// Resource packs ReadCloser and its meta info.
type Resource struct {
io.ReadCloser
Options
}
// New creates a Resource from ReadCloser.
func New(rc io.ReadCloser) *Resource {
return &Resource{
ReadCloser: rc,
Options: Options{},
}
}
// NewString creates a Resource with string as content.
func NewString(s string) *Resource {
b := bytes.NewReader([]byte(s))
return New(io.NopCloser(b))
}
// NewRedirect creates a Resource to redirect to another path.
func NewRedirect(redirectPath string) *Resource {
r := NewString("redirect to: " + redirectPath)
r.Options[commonconst.Redirect] = redirectPath
return r
}
// Raw returns underlying io.ReadCloser in this resource.
func (r *Resource) Raw() io.ReadCloser {
return r.ReadCloser
}
// Wrap creates new Resource with a io.ReadCloser which inherits properties
// from current Resource.
func (r *Resource) Wrap(rc io.ReadCloser) *Resource {
// TODO: copy other properties of r.
return &Resource{
ReadCloser: rc,
Options: r.Options.clone(),
}
}
// ReadSeekCloser obtains ReadSeekCloser if it could.
func (r *Resource) ReadSeekCloser() (ReadSeekCloser, bool) {
x, ok := r.ReadCloser.(ReadSeekCloser)
return x, ok
}
// Put puts a pair of name and value as an option.
func (r *Resource) Put(name string, value interface{}) *Resource {
r.Options[name] = value
return r
}
// PutString puts a string as an option. When value is empty string, it deletes
// the option.
func (r *Resource) PutString(name, value string) *Resource {
if value == "" {
delete(r.Options, name)
} else {
r.Options[name] = value
}
return r
}
// PutFilename puts a filenaem option.
func (r *Resource) PutFilename(s string) *Resource {
return r.PutString(Filename, s).GuessContentType(s)
}
// PutContentType puts a content-type option.
func (r *Resource) PutContentType(s string) *Resource {
return r.PutString(ContentType, s)
}
// GuessContentType guess a content-type from argument string.
func (r *Resource) GuessContentType(s string) *Resource {
ex := strings.ToLower(path.Ext(s))
if ct, ok := Mime[ex]; ok {
r.PutContentType(ct)
}
return r
}