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// Copyright 2012 Google Inc. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.
// Package image provides image services.
package image // import "google.golang.org/appengine/image"
import (
"fmt"
"net/url"
"golang.org/x/net/context"
"google.golang.org/appengine"
"google.golang.org/appengine/internal"
pb "google.golang.org/appengine/internal/image"
)
type ServingURLOptions struct {
Secure bool // whether the URL should use HTTPS
// Size must be between zero and 1600.
// If Size is non-zero, a resized version of the image is served,
// and Size is the served image's longest dimension. The aspect ratio is preserved.
// If Crop is true the image is cropped from the center instead of being resized.
Size int
Crop bool
}
// ServingURL returns a URL that will serve an image from Blobstore.
func ServingURL(c context.Context, key appengine.BlobKey, opts *ServingURLOptions) (*url.URL, error) {
req := &pb.ImagesGetUrlBaseRequest{
BlobKey: (*string)(&key),
}
if opts != nil && opts.Secure {
req.CreateSecureUrl = &opts.Secure
}
res := &pb.ImagesGetUrlBaseResponse{}
if err := internal.Call(c, "images", "GetUrlBase", req, res); err != nil {
return nil, err
}
// The URL may have suffixes added to dynamically resize or crop:
// - adding "=s32" will serve the image resized to 32 pixels, preserving the aspect ratio.
// - adding "=s32-c" is the same as "=s32" except it will be cropped.
u := *res.Url
if opts != nil && opts.Size > 0 {
u += fmt.Sprintf("=s%d", opts.Size)
if opts.Crop {
u += "-c"
}
}
return url.Parse(u)
}
// DeleteServingURL deletes the serving URL for an image.
func DeleteServingURL(c context.Context, key appengine.BlobKey) error {
req := &pb.ImagesDeleteUrlBaseRequest{
BlobKey: (*string)(&key),
}
res := &pb.ImagesDeleteUrlBaseResponse{}
return internal.Call(c, "images", "DeleteUrlBase", req, res)
}
func init() {
internal.RegisterErrorCodeMap("images", pb.ImagesServiceError_ErrorCode_name)
}
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