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