Use shared credential information from gscloud

go.mod

@@ -3,8 +3,10 @@ module github.com/terraform-providers/terraform-provider-gridscale
 require (
 	github.com/gridscale/gsclient-go/v3 v3.6.3
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.7.0
+	github.com/kirsle/configdir v0.0.0-20170128060238-e45d2f54772f
 	github.com/sirupsen/logrus v1.8.1 // indirect
 	golang.org/x/sys v0.0.0-20210510120138-977fb7262007 // indirect
+	gopkg.in/yaml.v2 v2.4.0
 )
 
 go 1.16

go.sum

@@ -222,6 +222,8 @@ github.com/jstemmer/go-junit-report v0.9.1 h1:6QPYqodiu3GuPL+7mfx+NwDdp2eTkp9IfE
 github.com/jstemmer/go-junit-report v0.9.1/go.mod h1:Brl9GWCQeLvo8nXZwPNNblvFj/XSXhF0NWZEnDohbsk=
 github.com/kevinburke/ssh_config v0.0.0-20201106050909-4977a11b4351 h1:DowS9hvgyYSX4TO5NpyC606/Z4SxnNYbT+WX27or6Ck=
 github.com/kevinburke/ssh_config v0.0.0-20201106050909-4977a11b4351/go.mod h1:CT57kijsi8u/K/BOFA39wgDQJ9CxiF4nAY/ojJ6r6mM=
+github.com/kirsle/configdir v0.0.0-20170128060238-e45d2f54772f h1:dKccXx7xA56UNqOcFIbuqFjAWPVtP688j5QMgmo6OHU=
+github.com/kirsle/configdir v0.0.0-20170128060238-e45d2f54772f/go.mod h1:4rEELDSfUAlBSyUjPG0JnaNGjf13JySHFeRdD/3dLP0=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/klauspost/compress v1.11.2 h1:MiK62aErc3gIiVEtyzKfeOHgW7atJb5g/KNX5m3c2nQ=
 github.com/klauspost/compress v1.11.2/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
@@ -588,6 +590,8 @@ gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRN
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

gridscale/config.go

@@ -2,10 +2,12 @@ package gridscale
 
 import (
 	"context"
+	"errors"
 	"log"
 	"os"
 
 	"github.com/gridscale/gsclient-go/v3"
+	"gopkg.in/yaml.v2"
 )
 
 //Arrays can't be constants in Go, but these will be used as constants
@@ -76,3 +78,32 @@ func (c *Config) Client() (*gsclient.Client, error) {
 
 	return client, err
 }
+
+// GSCloudAccountEntry represents a single account in the config file of gscloud.
+type GSCloudAccountEntry struct {
+	Name   string `yaml:"name"`
+	UserID string `yaml:"userId"`
+	Token  string `yaml:"token"`
+	URL    string `yaml:"url"`
+}
+
+// GSCloudConfig are all configuration settings parsed from a configuration file of gscloud.
+type GSCloudConfig struct {
+	Accounts []GSCloudAccountEntry `yaml:"accounts"`
+}
+
+func getGSCloudConfigFromPath(configFile string) (GSCloudConfig, error) {
+	config := GSCloudConfig{}
+	fileContent, err := os.ReadFile(configFile)
+	if err != nil {
+		return GSCloudConfig{}, err
+	}
+	err = yaml.Unmarshal(fileContent, &config)
+	if err != nil {
+		return GSCloudConfig{}, err
+	}
+	if len(config.Accounts) == 0 {
+		return GSCloudConfig{}, errors.New("no configuration in the config file.")
+	}
+	return config, nil
+}

gridscale/provider.go

@@ -2,10 +2,12 @@ package gridscale
 
 import (
 	"fmt"
+	"log"
 	"runtime"
 	"strings"
 
 	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
+	"github.com/kirsle/configdir"
 )
 
 var (
@@ -34,6 +36,11 @@ func Provider() *schema.Provider {
 				DefaultFunc: schema.EnvDefaultFunc("GRIDSCALE_URL", nil),
 				Description: "the url for the gridscale API.",
 			},
+			"config_file": {
+				Type:        schema.TypeString,
+				Optional:    true,
+				Description: "Path of the compatible config file, e.g., gscloud's config file. Note: Only the first configured account is used.",
+			},
 			"http_headers": {
 				Type:        schema.TypeString,
 				Optional:    true,
@@ -114,10 +121,32 @@ func Provider() *schema.Provider {
 func providerConfigure(d *schema.ResourceData) (interface{}, error) {
 	headers := convertStrToHeaderMap(d.Get("http_headers").(string))
 	headers["User-Agent"] = fmt.Sprintf("terraform-provider-gridscale/%s-%s-%s", version, commit, runtime.GOOS)
+	uuid := d.Get("uuid").(string)
+	token := d.Get("token").(string)
+	apiURL := d.Get("api_url").(string)
+	if uuid == "" && token == "" {
+		log.Println("uuid, token are not set. Getting authentication information from gscloud config file...")
+		var configFile string
+		configFileInf, ok := d.GetOk("config_file")
+		if !ok {
+			configFile = configdir.LocalConfig("gscloud") + "/config.yaml"
+		} else {
+			configFile = configFileInf.(string)
+		}
+		log.Printf("Reading gscloud config from \"%s\"\n", configFile)
+		gscloudCfg, err := getGSCloudConfigFromPath(configFile)
+		if err != nil {
+			return nil, err
+		}
+		// get the 1st gscloud account config to use for tf config.
+		firstGSCloudAccount := gscloudCfg.Accounts[0]
+		uuid, token, apiURL = firstGSCloudAccount.UserID, firstGSCloudAccount.Token, firstGSCloudAccount.URL
+	}
+
 	config := Config{
-		UserUUID:    d.Get("uuid").(string),
-		APIToken:    d.Get("token").(string),
-		APIUrl:      d.Get("api_url").(string),
+		UserUUID:    uuid,
+		APIToken:    token,
+		APIUrl:      apiURL,
 		DelayIntMs:  d.Get("request_delay_interval").(int),
 		MaxNRetries: d.Get("max_n_retries").(int),
 		HTTPHeaders: headers,