rancher: parse Rancher client cli.json config file (#11658)

* rancher: parse Rancher client cli.json config file

* Make it work

builtin/providers/rancher/provider.go

@@ -1,18 +1,31 @@
 package rancher
 
 import (
+	"encoding/json"
+	"io/ioutil"
+	"net/url"
+	"os"
+
 	"github.com/hashicorp/terraform/helper/schema"
 	"github.com/hashicorp/terraform/terraform"
 )
 
+type CLIConfig struct {
+	AccessKey   string `json:"accessKey"`
+	SecretKey   string `json:"secretKey"`
+	URL         string `json:"url"`
+	Environment string `json:"environment"`
+	Path        string `json:"path,omitempty"`
+}
+
 // Provider returns a terraform.ResourceProvider.
 func Provider() terraform.ResourceProvider {
 	return &schema.Provider{
 		Schema: map[string]*schema.Schema{
 			"api_url": &schema.Schema{
 				Type:        schema.TypeString,
-				Required:    true,
-				DefaultFunc: schema.EnvDefaultFunc("RANCHER_URL", nil),
+				Optional:    true,
+				DefaultFunc: schema.EnvDefaultFunc("RANCHER_URL", ""),
 				Description: descriptions["api_url"],
 			},
 			"access_key": &schema.Schema{
@@ -27,6 +40,12 @@ func Provider() terraform.ResourceProvider {
 				DefaultFunc: schema.EnvDefaultFunc("RANCHER_SECRET_KEY", ""),
 				Description: descriptions["secret_key"],
 			},
+			"config": &schema.Schema{
+				Type:        schema.TypeString,
+				Optional:    true,
+				DefaultFunc: schema.EnvDefaultFunc("RANCHER_CLIENT_CONFIG", ""),
+				Description: descriptions["config"],
+			},
 		},
 
 		ResourcesMap: map[string]*schema.Resource{
@@ -50,17 +69,64 @@ func init() {
 		"secret_key": "API secret used to authenticate with the rancher server",
 
 		"api_url": "The URL to the rancher API",
+
+		"config": "Path to the Rancher client cli.json config file",
 	}
 }
 
 func providerConfigure(d *schema.ResourceData) (interface{}, error) {
+	apiURL := d.Get("api_url").(string)
+	accessKey := d.Get("access_key").(string)
+	secretKey := d.Get("secret_key").(string)
+
+	if configFile := d.Get("config").(string); configFile != "" {
+		config, err := loadConfig(configFile)
+		if err != nil {
+			return config, err
+		}
+
+		if apiURL == "" {
+			u, err := url.Parse(config.URL)
+			if err != nil {
+				return config, err
+			}
+			apiURL = u.Scheme + "://" + u.Host
+		}
+
+		if accessKey == "" {
+			accessKey = config.AccessKey
+		}
+
+		if secretKey == "" {
+			secretKey = config.SecretKey
+		}
+	}
+
 	config := &Config{
-		APIURL:    d.Get("api_url").(string) + "/v1",
-		AccessKey: d.Get("access_key").(string),
-		SecretKey: d.Get("secret_key").(string),
+		APIURL:    apiURL + "/v1",
+		AccessKey: accessKey,
+		SecretKey: secretKey,
 	}
 
 	_, err := config.GlobalClient()
 
 	return config, err
 }
+
+func loadConfig(path string) (CLIConfig, error) {
+	config := CLIConfig{
+		Path: path,
+	}
+
+	content, err := ioutil.ReadFile(path)
+	if os.IsNotExist(err) {
+		return config, nil
+	} else if err != nil {
+		return config, err
+	}
+
+	err = json.Unmarshal(content, &config)
+	config.Path = path
+
+	return config, err
+}