Refactored/reorganized utils

internal/util/auth.go

@@ -0,0 +1,37 @@
+package util
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/viper"
+)
+
+// LoadAccessToken() tries to load a JWT string from an environment
+// variable, file, or config in that order. If loading the token
+// fails with one options, it will fallback to the next option until
+// all options are exhausted.
+//
+// Returns a token as a string with no error if successful.
+// Alternatively, returns an empty string with an error if a token is
+// not able to be loaded.
+func LoadAccessToken(path string) (string, error) {
+	// try to load token from env var
+	testToken := os.Getenv("ACCESS_TOKEN")
+	if testToken != "" {
+		return testToken, nil
+	}
+
+	// try reading access token from a file
+	b, err := os.ReadFile(path)
+	if err == nil {
+		return string(b), nil
+	}
+
+	// TODO: try to load token from config
+	testToken = viper.GetString("access_token")
+	if testToken != "" {
+		return testToken, nil
+	}
+	return "", fmt.Errorf("failed toload token from environment variable, file, or config")
+}