feat: allow for vault tocken cache (#21)

* feat: allow for vault tocken cache

* feat: documentation update

* feat: changelog update

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [0.1.9] - 2024-04-28
+
+## Added
+
+-- Vault cache token lookup
+
 ## [0.1.8] - 2024-04-28
 
 ## Fixed

docs/usage.md

@@ -67,6 +67,13 @@ Example: [`~/myuser/.vaul7y.yaml`](./examples/vaul7y.yaml)
 Or alternatively pass a config file as an argument using `-c <path/file.yaml>`  
 Example: `vaul7y -c ./new-env.yml`
 
+#### Authentication and variables priority
+Variables will be loaded in the following order, with the next superseding the previous ones:
+
+1. Will check for vault [token cache](https://developer.hashicorp.com/vault/docs/commands#authenticating-to-vault)
+2. Read from env variables
+3. Config file 
+
 ### Features
 
 Currently the capabilities are limited. 

internal/config/configs.go

@@ -36,11 +36,14 @@ func LoadConfig(cfgFile string) Config {
 
 	var data []byte
 	if cfgFile == "" {
-		fmt.Println("No config file specified")
 		yamlFilePath := filepath.Join(home, ".vaul7y.yaml")
-		data, err = os.ReadFile(yamlFilePath)
-		if err != nil {
-			fmt.Printf("Error reading YAML file: %v\n", err)
+		if _, err := os.Stat(yamlFilePath); os.IsNotExist(err) {
+			fmt.Printf("Config file does not exist: %s\n", yamlFilePath)
+		} else {
+			data, err = os.ReadFile(yamlFilePath)
+			if err != nil {
+				fmt.Printf("Error reading YAML file: %v\n", err)
+			}
 		}
 	} else {
 		fmt.Println("Using config file: ", cfgFile)
@@ -50,9 +53,29 @@ func LoadConfig(cfgFile string) Config {
 		}
 	}
 
-	err = yaml.Unmarshal(data, &config)
+	if data != nil {
+		err = yaml.Unmarshal(data, &config)
+		if err != nil {
+			fmt.Printf("Error parsing YAML file: %v\n", err)
+		}
+	}
+
+	// Check for vault cache
+	home, err = os.UserHomeDir()
 	if err != nil {
-		fmt.Printf("Error parsing YAML file: %v\n", err)
+		fmt.Println("Error getting user home directory")
+	} else {
+		vaultTokenPath := filepath.Join(home, ".vault-token")
+		if _, err := os.Stat(vaultTokenPath); os.IsNotExist(err) {
+			fmt.Printf("Vault token file does not exist: %s\n", vaultTokenPath)
+		} else {
+			data, err := os.ReadFile(vaultTokenPath)
+			if err != nil {
+				fmt.Printf("Error reading vault token file: %v\n", err)
+			} else {
+				config.VaultToken = string(data)
+			}
+		}
 	}
 
 	// Overwrite with environment variables if they are set
@@ -89,6 +112,23 @@ func LoadConfig(cfgFile string) Config {
 		}
 	}
 
+	if config.VaultToken == "" {
+		home, err := os.UserHomeDir()
+		if err != nil {
+			fmt.Println("Error getting user home directory")
+		} else {
+			vaultTokenPath := filepath.Join(home, ".vault-token")
+			if _, err := os.Stat(vaultTokenPath); err == nil {
+				data, err := os.ReadFile(vaultTokenPath)
+				if err != nil {
+					fmt.Printf("Error reading vault token file: %v\n", err)
+				} else {
+					config.VaultToken = string(data)
+				}
+			}
+		}
+	}
+
 	if config.VaultAddr == "" {
 		fmt.Println("VAULT_ADDR is not set. Please set it and try again.")
 		os.Exit(1)