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storage.go
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storage.go
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// Copyright 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package testgcs is a light GCS client used for testings to avoid pulling in
// dependencies.
package testgcs
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"cloud.google.com/go/auth"
"cloud.google.com/go/auth/httptransport"
"cloud.google.com/go/auth/internal"
)
// Client is a lightweight GCS client for testing.
type Client struct {
client *http.Client
}
// NewClient creates a [Client] using the provided
// [cloud.google.com/go/auth.TokenProvider] for authentication.
func NewClient(tp auth.TokenProvider) *Client {
client := internal.CloneDefaultClient()
httptransport.AddAuthorizationMiddleware(client, auth.NewCredentials(&auth.CredentialsOptions{
TokenProvider: tp,
}))
return &Client{
client: client,
}
}
// CreateBucket creates the specified bucket.
func (c *Client) CreateBucket(ctx context.Context, projectID, bucket string) error {
var bucketRequest struct {
Name string `json:"name,omitempty"`
}
bucketRequest.Name = bucket
b, err := json.Marshal(bucketRequest)
if err != nil {
return err
}
req, err := http.NewRequest("POST", fmt.Sprintf("https://storage.googleapis.com/storage/v1/b?project=%s", projectID), bytes.NewReader(b))
if err != nil {
return err
}
req.Header.Add("Content-Type", "application/json")
resp, err := c.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode > 299 {
errBody, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
return fmt.Errorf("%s", errBody)
}
return nil
}
// DeleteBucket deletes the specified bucket.
func (c *Client) DeleteBucket(ctx context.Context, bucket string) error {
req, err := http.NewRequest("DELETE", fmt.Sprintf("https://storage.googleapis.com/storage/v1/b/%s", bucket), nil)
if err != nil {
return err
}
resp, err := c.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode < 200 || resp.StatusCode > 299 {
errBody, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
return fmt.Errorf("%s", errBody)
}
return nil
}
// DownloadObject returns an [http.Response] who's body can be consumed to
// read the contents of an object.
func (c *Client) DownloadObject(ctx context.Context, bucket, object string) (*http.Response, error) {
req, err := http.NewRequest("GET", fmt.Sprintf("https://storage.googleapis.com/storage/v1/b/%s/o/%s", bucket, object), nil)
if err != nil {
return nil, err
}
req.Header.Add("alt", "media")
resp, err := c.client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode < 200 || resp.StatusCode > 299 {
errBody, err := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return nil, fmt.Errorf("%s", errBody)
}
return resp, nil
}