Add google_storage_signed_url data source.
This commit is contained in:
Matt Morrison
Matt Morrison
parent
19e8932a92
commit
80a42feb5a
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package google
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import (
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"bytes"
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/x509"
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"encoding/base64"
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"encoding/pem"
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"fmt"
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"github.com/hashicorp/terraform/helper/pathorcontents"
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"github.com/hashicorp/terraform/helper/schema"
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"golang.org/x/oauth2/google"
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"golang.org/x/oauth2/jwt"
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"log"
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"net/url"
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"os"
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"os/user"
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"strconv"
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"strings"
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"time"
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)
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const gcsBaseUrl = "https://storage.googleapis.com"
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const envVar = "GOOGLE_APPLICATION_CREDENTIALS"
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func dataSourceGoogleSignedUrl() *schema.Resource {
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return &schema.Resource{
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Read: dataSourceGoogleSignedUrlRead,
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Schema: map[string]*schema.Schema{
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"bucket": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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},
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//TODO: implement support
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//"content_type": &schema.Schema{
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// Type: schema.TypeString,
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// Optional: true,
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// Default: "",
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//},
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"credentials": &schema.Schema{
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Type: schema.TypeString,
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Optional: true,
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},
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"duration": &schema.Schema{
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Type: schema.TypeString,
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Optional: true,
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Default: "1h",
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},
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"http_method": &schema.Schema{
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Type: schema.TypeString,
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Optional: true,
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Default: "GET",
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},
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//TODO: implement support
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//"http_headers": &schema.Schema{
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// Type: schema.TypeList,
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// Optional: true,
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//},
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//TODO: implement support
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//"md5_digest": &schema.Schema{
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// Type: schema.TypeString,
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// Optional: true,
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// Default: "",
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//},
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"path": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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},
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"signed_url": &schema.Schema{
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Type: schema.TypeString,
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Computed: true,
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},
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},
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}
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}
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func dataSourceGoogleSignedUrlRead(d *schema.ResourceData, meta interface{}) error {
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config := meta.(*Config)
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Build UrlData object from data source attributes
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urlData := &UrlData{}
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// HTTP Method
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if method, ok := d.GetOk("http_method"); ok && len(method.(string)) >= 3 {
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urlData.HttpMethod = method.(string)
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} else {
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return fmt.Errorf("not a valid http method")
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}
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// convert duration to an expiration datetime (unix time in seconds)
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durationString := "1h"
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if v, ok := d.GetOk("duration"); ok {
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durationString = v.(string)
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}
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duration, err := time.ParseDuration(durationString)
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if err != nil {
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return fmt.Errorf("could not parse duration")
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}
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expires := time.Now().Unix() + int64(duration.Seconds())
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urlData.Expires = int(expires)
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// object path
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path := []string{
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"",
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d.Get("bucket").(string),
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d.Get("path").(string),
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}
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objectPath := strings.Join(path, "/")
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urlData.Path = objectPath
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Load JWT Config from Google Credentials
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jwtConfig, err := loadJwtConfig(d, config)
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if err != nil {
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return err
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}
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urlData.JwtConfig = jwtConfig
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Sign url object data
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signature, err := SignString(urlData.CreateSigningString(), jwtConfig)
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if err != nil {
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return fmt.Errorf("could not sign data: %v", err)
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}
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urlData.Signature = signature
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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// Construct URL
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finalUrl := urlData.BuildUrl()
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d.SetId(finalUrl)
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d.Set("signed_url", finalUrl)
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return nil
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}
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// This looks for credentials json in the following places,
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// preferring the first location found:
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//
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// 1. Credentials provided in data source `credentials` attribute.
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// 2. Credentials provided in the provider definition.
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// 3. A JSON file whose path is specified by the
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// GOOGLE_APPLICATION_CREDENTIALS environment variable.
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func loadJwtConfig(d *schema.ResourceData, meta interface{}) (*jwt.Config, error) {
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config := meta.(*Config)
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credentials := ""
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if v, ok := d.GetOk("credentials"); ok {
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log.Println("[DEBUG] using data source credentials")
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credentials = v.(string)
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} else if config.Credentials != "" {
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log.Println("[DEBUG] using provider credentials")
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credentials = config.Credentials
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} else if filename := os.Getenv(envVar); filename != "" {
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log.Println("[DEBUG] using env GOOGLE_APPLICATION_CREDENTIALS credentials")
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credentials = filename
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}
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if strings.TrimSpace(credentials) != "" {
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contents, _, err := pathorcontents.Read(credentials)
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if err != nil {
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return nil, fmt.Errorf("Error loading credentials: %s", err)
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}
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cfg, err := google.JWTConfigFromJSON([]byte(contents), "")
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if err != nil {
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return nil, fmt.Errorf("Error parsing credentials: \n %s \n Error: %s", contents, err)
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}
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return cfg, nil
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}
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return nil, fmt.Errorf("Credentials not provided in resource or provider configuration or GOOGLE_APPLICATION_CREDENTIALS environment variable.")
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}
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func guessUnixHomeDir() string {
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usr, err := user.Current()
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if err == nil {
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return usr.HomeDir
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}
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return os.Getenv("HOME")
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}
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// parsePrivateKey converts the binary contents of a private key file
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// to an *rsa.PrivateKey. It detects whether the private key is in a
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// PEM container or not. If so, it extracts the the private key
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// from PEM container before conversion. It only supports PEM
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// containers with no passphrase.
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// copied from golang.org/x/oauth2/internal
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func parsePrivateKey(key []byte) (*rsa.PrivateKey, error) {
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block, _ := pem.Decode(key)
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if block != nil {
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key = block.Bytes
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}
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parsedKey, err := x509.ParsePKCS8PrivateKey(key)
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if err != nil {
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parsedKey, err = x509.ParsePKCS1PrivateKey(key)
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if err != nil {
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return nil, fmt.Errorf("private key should be a PEM or plain PKSC1 or PKCS8; parse error: %v", err)
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}
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}
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parsed, ok := parsedKey.(*rsa.PrivateKey)
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if !ok {
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return nil, fmt.Errorf("private key is invalid")
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}
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return parsed, nil
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}
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type UrlData struct {
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JwtConfig *jwt.Config
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HttpMethod string
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Expires int
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Path string
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Signature []byte
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}
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// Creates a string in the form ready for signing:
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// https://cloud.google.com/storage/docs/access-control/create-signed-urls-program
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// Example output:
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// -------------------
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// GET
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//
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//
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// 1388534400
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// bucket/objectname
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// -------------------
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func (u *UrlData) CreateSigningString() []byte {
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var buf bytes.Buffer
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// HTTP VERB
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buf.WriteString(u.HttpMethod)
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buf.WriteString("\n")
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// MD5 digest (optional)
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// TODO
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buf.WriteString("\n")
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// request content-type (optional)
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// TODO
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buf.WriteString("\n")
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// signed url expiration
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buf.WriteString(strconv.Itoa(u.Expires))
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buf.WriteString("\n")
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// additional request headers (optional)
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// TODO
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// object path
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buf.WriteString(u.Path)
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return buf.Bytes()
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}
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// Builds the final signed URL a client can use to retrieve storage object
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func (u *UrlData) BuildUrl() string {
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// base64 encode signature
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encoded := base64.StdEncoding.EncodeToString(u.Signature)
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// encoded signature may include /, = characters that need escaping
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encoded = url.QueryEscape(encoded)
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// set url
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// https://cloud.google.com/storage/docs/access-control/create-signed-urls-program
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var urlBuffer bytes.Buffer
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urlBuffer.WriteString(gcsBaseUrl)
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urlBuffer.WriteString(u.Path)
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urlBuffer.WriteString("?GoogleAccessId=")
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urlBuffer.WriteString(u.JwtConfig.Email)
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urlBuffer.WriteString("&Expires=")
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urlBuffer.WriteString(strconv.Itoa(u.Expires))
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urlBuffer.WriteString("&Signature=")
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urlBuffer.WriteString(encoded)
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return urlBuffer.String()
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}
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func SignString(toSign []byte, cfg *jwt.Config) ([]byte, error) {
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pk, err := parsePrivateKey(cfg.PrivateKey)
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if err != nil {
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return nil, fmt.Errorf("could not parse key: %v\nKey:%s", err, string(cfg.PrivateKey))
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}
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// Hash string
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hasher := sha256.New()
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hasher.Write(toSign)
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signed, err := rsa.SignPKCS1v15(rand.Reader, pk, crypto.SHA256, hasher.Sum(nil))
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if err != nil {
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return nil, fmt.Errorf("Error from signing: %s\n", err)
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}
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return signed, nil
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}
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@ -0,0 +1,212 @@
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package google
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import (
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"testing"
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"bytes"
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"encoding/base64"
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"fmt"
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"github.com/hashicorp/terraform/helper/acctest"
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"github.com/hashicorp/terraform/helper/resource"
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"github.com/hashicorp/terraform/terraform"
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"golang.org/x/oauth2/google"
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"io/ioutil"
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"net/http"
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"net/url"
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)
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const fakeCredentials = `{
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"type": "service_account",
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"project_id": "gcp-project",
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"private_key_id": "29a54056cee3d6886d9e8515a959af538ab5add9",
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"private_key": "-----BEGIN RSA PRIVATE KEY-----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\ncqXLbAV9WDpIJ3Bpa/S8tWujWhLDmixn2JeAdurWS+naH9U9e4I6Rw==\n-----END RSA PRIVATE KEY-----\n",
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"client_email": "user@gcp-project.iam.gserviceaccount.com",
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"client_id": "103198861025845558729",
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"auth_uri": "https://accounts.google.com/o/oauth2/auth",
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"token_uri": "https://accounts.google.com/o/oauth2/token",
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"auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
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"client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/user%40gcp-project.iam.gserviceaccount.com"
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}`
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// The following values are derived from the output of the `gsutil signurl` command.
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// i.e.
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// gsutil signurl fake_creds.json gs://tf-test-bucket-6159205297736845881/path/to/file
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// URL HTTP Method Expiration Signed URL
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// gs://tf-test-bucket-6159205297736845881/path/to/file GET 2016-08-12 14:03:30 https://storage.googleapis.com/tf-test-bucket-6159205297736845881/path/to/file?GoogleAccessId=user@gcp-project.iam.gserviceaccount.com&Expires=1470967410&Signature=JJvE2Jc%2BeoagyS1qRACKBGUkgLkKjw7cGymHhtB4IzzN3nbXDqr0acRWGy0%2BEpZ3HYNDalEYsK0lR9Q0WCgty5I0JKmPIuo9hOYa1xTNH%2B22xiWsekxGV%2FcA9FXgWpi%2BFt7fBmMk4dhDe%2BuuYc7N79hd0FYuSBNW1Wp32Bluoe4SNkNAB%2BuIDd9KqPzqs09UAbBoz2y4WxXOQnRyR8GAfb8B%2FDtv62gYjtmp%2F6%2Fyr6xj7byWKZdQt8kEftQLTQmP%2F17Efjp6p%2BXo71Q0F9IhAFiqWfp3Ij8hHDSebLcVb2ULXyHNNQpHBOhFgALrFW3I6Uc3WciLEOsBS9Ej3EGdTg%3D%3D
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const testUrlPath = "/tf-test-bucket-6159205297736845881/path/to/file"
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const testUrlExpires = 1470967410
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const testUrlExpectedSignatureBase64Encoded = "JJvE2Jc%2BeoagyS1qRACKBGUkgLkKjw7cGymHhtB4IzzN3nbXDqr0acRWGy0%2BEpZ3HYNDalEYsK0lR9Q0WCgty5I0JKmPIuo9hOYa1xTNH%2B22xiWsekxGV%2FcA9FXgWpi%2BFt7fBmMk4dhDe%2BuuYc7N79hd0FYuSBNW1Wp32Bluoe4SNkNAB%2BuIDd9KqPzqs09UAbBoz2y4WxXOQnRyR8GAfb8B%2FDtv62gYjtmp%2F6%2Fyr6xj7byWKZdQt8kEftQLTQmP%2F17Efjp6p%2BXo71Q0F9IhAFiqWfp3Ij8hHDSebLcVb2ULXyHNNQpHBOhFgALrFW3I6Uc3WciLEOsBS9Ej3EGdTg%3D%3D"
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const testUrlExpectedUrl = "https://storage.googleapis.com/tf-test-bucket-6159205297736845881/path/to/file?GoogleAccessId=user@gcp-project.iam.gserviceaccount.com&Expires=1470967410&Signature=JJvE2Jc%2BeoagyS1qRACKBGUkgLkKjw7cGymHhtB4IzzN3nbXDqr0acRWGy0%2BEpZ3HYNDalEYsK0lR9Q0WCgty5I0JKmPIuo9hOYa1xTNH%2B22xiWsekxGV%2FcA9FXgWpi%2BFt7fBmMk4dhDe%2BuuYc7N79hd0FYuSBNW1Wp32Bluoe4SNkNAB%2BuIDd9KqPzqs09UAbBoz2y4WxXOQnRyR8GAfb8B%2FDtv62gYjtmp%2F6%2Fyr6xj7byWKZdQt8kEftQLTQmP%2F17Efjp6p%2BXo71Q0F9IhAFiqWfp3Ij8hHDSebLcVb2ULXyHNNQpHBOhFgALrFW3I6Uc3WciLEOsBS9Ej3EGdTg%3D%3D"
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func TestUrlData_Signing(t *testing.T) {
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urlData := &UrlData{
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HttpMethod: "GET",
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Expires: testUrlExpires,
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Path: testUrlPath,
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}
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// unescape and decode the expected signature
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expectedSig, err := url.QueryUnescape(testUrlExpectedSignatureBase64Encoded)
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if err != nil {
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t.Error(err)
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}
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expected, err := base64.StdEncoding.DecodeString(expectedSig)
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if err != nil {
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t.Error(err)
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}
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// load fake service account credentials
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cfg, err := google.JWTConfigFromJSON([]byte(fakeCredentials), "")
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if err != nil {
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t.Error(err)
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}
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// create url data signature
|
||||
toSign := urlData.CreateSigningString()
|
||||
result, err := SignString(toSign, cfg)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
|
||||
// compare to expected value
|
||||
if !bytes.Equal(result, expected) {
|
||||
t.Errorf("Signatures do not match:\n%x\n%x\n", expected, result)
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
func TestUrlData_CreateUrl(t *testing.T) {
|
||||
// unescape and decode the expected signature
|
||||
encodedSig, err := url.QueryUnescape(testUrlExpectedSignatureBase64Encoded)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
sig, err := base64.StdEncoding.DecodeString(encodedSig)
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
|
||||
// load fake service account credentials
|
||||
cfg, err := google.JWTConfigFromJSON([]byte(fakeCredentials), "")
|
||||
if err != nil {
|
||||
t.Error(err)
|
||||
}
|
||||
|
||||
urlData := &UrlData{
|
||||
HttpMethod: "GET",
|
||||
Expires: testUrlExpires,
|
||||
Path: testUrlPath,
|
||||
Signature: sig,
|
||||
JwtConfig: cfg,
|
||||
}
|
||||
result := urlData.BuildUrl()
|
||||
if result != testUrlExpectedUrl {
|
||||
t.Errorf("URL does not match expected value:\n%s\n%s", testUrlExpectedUrl, result)
|
||||
}
|
||||
}
|
||||
|
||||
func TestDatasourceSignedUrl_basic(t *testing.T) {
|
||||
resource.Test(t, resource.TestCase{
|
||||
//PreCheck: func() { testAccPreCheck(t) },
|
||||
Providers: testAccProviders,
|
||||
Steps: []resource.TestStep{
|
||||
resource.TestStep{
|
||||
Config: testGoogleSignedUrlConfig,
|
||||
Check: resource.ComposeTestCheckFunc(
|
||||
testAccGoogleSignedUrlExists("data.google_storage_object_signed_url.blerg"),
|
||||
),
|
||||
},
|
||||
},
|
||||
})
|
||||
}
|
||||
|
||||
func TestDatasourceSignedUrl_accTest(t *testing.T) {
|
||||
bucketName := fmt.Sprintf("tf-test-bucket-%d", acctest.RandInt())
|
||||
|
||||
resource.Test(t, resource.TestCase{
|
||||
//PreCheck: func() { testAccPreCheck(t) },
|
||||
Providers: testAccProviders,
|
||||
Steps: []resource.TestStep{
|
||||
resource.TestStep{
|
||||
Config: testAccTestGoogleStorageObjectSingedUrl(bucketName),
|
||||
Check: resource.ComposeTestCheckFunc(
|
||||
testAccGoogleSignedUrlRetrieval("data.google_storage_object_signed_url.story_url"),
|
||||
),
|
||||
},
|
||||
},
|
||||
})
|
||||
}
|
||||
|
||||
func testAccGoogleSignedUrlExists(n string) resource.TestCheckFunc {
|
||||
return func(s *terraform.State) error {
|
||||
|
||||
r := s.RootModule().Resources[n]
|
||||
a := r.Primary.Attributes
|
||||
|
||||
if a["signed_url"] == "" {
|
||||
return fmt.Errorf("signed_url is empty: %v", a)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
func testAccGoogleSignedUrlRetrieval(n string) resource.TestCheckFunc {
|
||||
return func(s *terraform.State) error {
|
||||
r := s.RootModule().Resources[n]
|
||||
a := r.Primary.Attributes
|
||||
|
||||
if a["signed_url"] == "" {
|
||||
return fmt.Errorf("signed_url is empty: %v", a)
|
||||
}
|
||||
|
||||
url := a["signed_url"]
|
||||
|
||||
// send request to GET object using signed url
|
||||
client := http.DefaultClient
|
||||
response, err := client.Get(url)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
defer response.Body.Close()
|
||||
body, err := ioutil.ReadAll(response.Body)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if string(body) != "once upon a time..." {
|
||||
return fmt.Errorf("Got unexpected object contents: %s\n\tURL: %s", string(body), url)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
const testGoogleSignedUrlConfig = `
|
||||
data "google_storage_object_signed_url" "blerg" {
|
||||
bucket = "friedchicken"
|
||||
path = "path/to/file"
|
||||
|
||||
}
|
||||
`
|
||||
|
||||
func testAccTestGoogleStorageObjectSingedUrl(bucketName string) string {
|
||||
return fmt.Sprintf(`
|
||||
resource "google_storage_bucket" "bucket" {
|
||||
name = "%s"
|
||||
}
|
||||
|
||||
resource "google_storage_bucket_object" "story" {
|
||||
name = "path/to/file"
|
||||
bucket = "${google_storage_bucket.bucket.name}"
|
||||
|
||||
content = "once upon a time..."
|
||||
}
|
||||
|
||||
data "google_storage_object_signed_url" "story_url" {
|
||||
bucket = "${google_storage_bucket.bucket.name}"
|
||||
path = "${google_storage_bucket_object.story.name}"
|
||||
|
||||
}
|
||||
`, bucketName)
|
||||
}
|
||||
|
|
@ -58,6 +58,7 @@ func Provider() terraform.ResourceProvider {
|
|||
|
||||
DataSourcesMap: map[string]*schema.Resource{
|
||||
"google_iam_policy": dataSourceGoogleIamPolicy(),
|
||||
"google_storage_object_signed_url": dataSourceGoogleSignedUrl(),
|
||||
},
|
||||
|
||||
ResourcesMap: map[string]*schema.Resource{
|
||||
|
|
|
|||
Loading…
Reference in New Issue