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storage.go
104 lines (85 loc) · 2 KB
/
storage.go
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package storage
import (
"context"
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"net/http"
"net/url"
"cloud.google.com/go/storage"
)
// Client encapsulates operations on GCP cloud storage.
type Client struct {
bucket *storage.BucketHandle
project string
}
// New creates a new storage client, scoped to the specified project.
func New(ctx context.Context, project string) (Client, error) {
c := Client{
project: project,
}
client, err := storage.NewClient(ctx)
if err != nil {
return c, err
}
bkt := client.Bucket("purchase-saving-planner-images-local")
c.bucket = bkt
if _, err := bkt.Attrs(ctx); err == storage.ErrBucketNotExist {
if err := bkt.Create(ctx, c.project, nil); err != nil {
return c, err
}
}
if err := bkt.ACL().Set(ctx, storage.AllUsers, storage.RoleReader); err != nil {
return c, err
}
attrs, err := bkt.Attrs(ctx)
if err != nil {
return c, err
}
fmt.Println(attrs.Website)
return c, nil
}
// PutImage will retrieve an image's contents and store it in the image bucket.
// It will store the name as an MD5 hash of the URL.
// The returned value is the hash of the URL.
func (c Client) PutImage(ctx context.Context, u string) (string, error) {
h := md5.New()
if _, err := io.WriteString(h, u); err != nil {
return "", err
}
hash := hex.EncodeToString(h.Sum(nil))
obj := c.bucket.Object(hash)
w := obj.NewWriter(ctx)
parsed, err := url.Parse(u)
if err != nil {
return "", err
}
parsed.Scheme = "https"
res, err := http.Get(parsed.String())
if err != nil {
return "", err
}
defer res.Body.Close()
if _, err := io.Copy(w, res.Body); err != nil {
return "", err
}
if err := w.Close(); err != nil {
return "", err
}
if err := obj.ACL().Set(ctx, storage.AllUsers, storage.RoleReader); err != nil {
return "", err
}
attrs, err := obj.Attrs(ctx)
if err != nil {
return "", err
}
ml, err := url.Parse(attrs.MediaLink)
if err != nil {
return "", err
}
q := ml.Query()
q.Del("generation")
ml.RawQuery = q.Encode()
return ml.String(), nil
}