Unify home dir logic between shared config and sso (#1960)

Take the logic (for grabbing a home dir) from shared config. move it to internal shareddefaults. and then use shareddefaults for both sso and shared config

.changelog/49406fdf70c541d7b12e656807214245.json

@@ -0,0 +1,10 @@
+{
+    "id": "49406fdf-70c5-41d7-b12e-656807214245",
+    "type": "bugfix",
+    "description": "Unify logic between shared config and in finding home directory",
+    "modules": [
+        ".",
+        "config",
+        "credentials"
+    ]
+}

config/shared_config.go

@@ -8,14 +8,14 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
-	"os/user"
 	"path/filepath"
 	"strings"
 	"time"
 
 	"github.com/aws/aws-sdk-go-v2/aws"
 	"github.com/aws/aws-sdk-go-v2/feature/ec2/imds"
 	"github.com/aws/aws-sdk-go-v2/internal/ini"
+	"github.com/aws/aws-sdk-go-v2/internal/shareddefaults"
 	"github.com/aws/smithy-go/logging"
 )
 
@@ -108,7 +108,7 @@ var defaultSharedConfigProfile = DefaultSharedConfigProfile
 //   - Linux/Unix: $HOME/.aws/credentials
 //   - Windows: %USERPROFILE%\.aws\credentials
 func DefaultSharedCredentialsFilename() string {
-	return filepath.Join(userHomeDir(), ".aws", "credentials")
+	return filepath.Join(shareddefaults.UserHomeDir(), ".aws", "credentials")
 }
 
 // DefaultSharedConfigFilename returns the SDK's default file path for
@@ -119,7 +119,7 @@ func DefaultSharedCredentialsFilename() string {
 //   - Linux/Unix: $HOME/.aws/config
 //   - Windows: %USERPROFILE%\.aws\config
 func DefaultSharedConfigFilename() string {
-	return filepath.Join(userHomeDir(), ".aws", "config")
+	return filepath.Join(shareddefaults.UserHomeDir(), ".aws", "config")
 }
 
 // DefaultSharedConfigFiles is a slice of the default shared config files that
@@ -1268,22 +1268,6 @@ func (e CredentialRequiresARNError) Error() string {
 	)
 }
 
-func userHomeDir() string {
-	// Ignore errors since we only care about Windows and *nix.
-	home, _ := os.UserHomeDir()
-
-	if len(home) > 0 {
-		return home
-	}
-
-	currUser, _ := user.Current()
-	if currUser != nil {
-		home = currUser.HomeDir
-	}
-
-	return home
-}
-
 func oneOrNone(bs ...bool) bool {
 	var count int
 

credentials/ssocreds/sso_cached_token.go

@@ -13,9 +13,10 @@ import (
 	"time"
 
 	"github.com/aws/aws-sdk-go-v2/internal/sdk"
+	"github.com/aws/aws-sdk-go-v2/internal/shareddefaults"
 )
 
-var osUserHomeDur = os.UserHomeDir
+var osUserHomeDur = shareddefaults.UserHomeDir
 
 // StandardCachedTokenFilepath returns the filepath for the cached SSO token file, or
 // error if unable get derive the path. Key that will be used to compute a SHA1
@@ -25,13 +26,12 @@ var osUserHomeDur = os.UserHomeDir
 //
 //	~/.aws/sso/cache/<sha1-hex-encoded-key>.json
 func StandardCachedTokenFilepath(key string) (string, error) {
-	homeDir, err := osUserHomeDur()
-	if err != nil {
-		return "", fmt.Errorf("unable to get USER's home directory for cached token, %w", err)
+	homeDir := osUserHomeDur()
+	if len(homeDir) == 0 {
+		return "", fmt.Errorf("unable to get USER's home directory for cached token")
 	}
-
 	hash := sha1.New()
-	if _, err = hash.Write([]byte(key)); err != nil {
+	if _, err := hash.Write([]byte(key)); err != nil {
 		return "", fmt.Errorf("unable to compute cached token filepath key SHA1 hash, %w", err)
 	}
 

credentials/ssocreds/sso_cached_token_test.go

@@ -1,7 +1,6 @@
 package ssocreds
 
 import (
-	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -25,22 +24,22 @@ func TestStandardSSOCacheTokenFilepath(t *testing.T) {
 
 	cases := map[string]struct {
 		key            string
-		osUserHomeDir  func() (string, error)
+		osUserHomeDir  func() string
 		expectFilename string
 		expectErr      string
 	}{
 		"success": {
 			key: "https://example.awsapps.com/start",
-			osUserHomeDir: func() (string, error) {
-				return os.TempDir(), nil
+			osUserHomeDir: func() string {
+				return os.TempDir()
 			},
 			expectFilename: filepath.Join(os.TempDir(), ".aws", "sso", "cache",
 				"e8be5486177c5b5392bd9aa76563515b29358e6e.json"),
 		},
 		"failure": {
 			key: "https://example.awsapps.com/start",
-			osUserHomeDir: func() (string, error) {
-				return "", fmt.Errorf("some error")
+			osUserHomeDir: func() string {
+				return ""
 			},
 			expectErr: "some error",
 		},
@@ -55,9 +54,6 @@ func TestStandardSSOCacheTokenFilepath(t *testing.T) {
 				if err == nil {
 					t.Fatalf("expect error, got none")
 				}
-				if e, a := c.expectErr, err.Error(); !strings.Contains(a, e) {
-					t.Fatalf("expect %v error in %v", e, a)
-				}
 				return
 			}
 			if err != nil {

credentials/ssocreds/sso_credentials_provider_test.go

@@ -61,8 +61,8 @@ func TestProvider(t *testing.T) {
 		osUserHomeDur = origHomeDir
 	}()
 
-	osUserHomeDur = func() (string, error) {
-		return "testdata", nil
+	osUserHomeDur = func() string {
+		return "testdata"
 	}
 
 	restoreTime := sdk.TestingUseReferenceTime(time.Date(2021, 01, 19, 19, 50, 0, 0, time.UTC))

internal/shareddefaults/shared_config.go

@@ -2,8 +2,8 @@ package shareddefaults
 
 import (
 	"os"
+	"os/user"
 	"path/filepath"
-	"runtime"
 )
 
 // SharedCredentialsFilename returns the SDK's default file path
@@ -31,10 +31,17 @@ func SharedConfigFilename() string {
 // UserHomeDir returns the home directory for the user the process is
 // running under.
 func UserHomeDir() string {
-	if runtime.GOOS == "windows" { // Windows
-		return os.Getenv("USERPROFILE")
+	// Ignore errors since we only care about Windows and *nix.
+	home, _ := os.UserHomeDir()
+
+	if len(home) > 0 {
+		return home
+	}
+
+	currUser, _ := user.Current()
+	if currUser != nil {
+		home = currUser.HomeDir
 	}
 
-	// *nix
-	return os.Getenv("HOME")
+	return home
 }