Cleanup model/utils.go (#17945)

* Cleanup model/utils.go

- Removed some functions which were unsued. (The unused linter was somehow failing to catch this).
- Moved some functions inside other packages.
- Removed two duplicate instances of the same function - RemoveDuplicateStrings and UniqueStrings.
- Moved some regexes to global vars to prevent compilation every time.

```release-note
NONE
```

* fix lint

```release-note
NONE
```

* bring back unused exception

```release-note
NONE
```

* fix tests

```release-note
NONE
```

* Address review comments

```release-note
NONE
```

api4/post_test.go

@@ -847,21 +847,22 @@ func TestPatchPost(t *testing.T) {
 
 	th.App.Srv().SetLicense(model.NewTestLicense())
 
-	fileIds := make([]string, 3)
+	fileIDs := make([]string, 3)
 	data, err := testutils.ReadTestFile("test.png")
 	require.NoError(t, err)
-	for i := 0; i < len(fileIds); i++ {
+	for i := 0; i < len(fileIDs); i++ {
 		fileResp, resp := Client.UploadFile(data, channel.Id, "test.png")
 		CheckNoError(t, resp)
-		fileIds[i] = fileResp.FileInfos[0].Id
+		fileIDs[i] = fileResp.FileInfos[0].Id
 	}
+	sort.Strings(fileIDs)
 
 	post := &model.Post{
 		ChannelId:    channel.Id,
 		IsPinned:     true,
 		Message:      "#hashtag a message",
 		Props:        model.StringInterface{"channel_header": "old_header"},
-		FileIds:      fileIds[0:2],
+		FileIds:      fileIDs[0:2],
 		HasReactions: true,
 	}
 	post, _ = Client.CreatePost(post)
@@ -873,7 +874,7 @@ func TestPatchPost(t *testing.T) {
 		patch.IsPinned = model.NewBool(false)
 		patch.Message = model.NewString("#otherhashtag other message")
 		patch.Props = &model.StringInterface{"channel_header": "new_header"}
-		patchFileIds := model.StringArray(fileIds) // one extra file
+		patchFileIds := model.StringArray(fileIDs) // one extra file
 		patch.FileIds = &patchFileIds
 		patch.HasReactions = model.NewBool(false)
 
@@ -885,7 +886,7 @@ func TestPatchPost(t *testing.T) {
 		assert.Equal(t, "#otherhashtag other message", rpost.Message, "Message did not update properly")
 		assert.Equal(t, *patch.Props, rpost.GetProps(), "Props did not update properly")
 		assert.Equal(t, "#otherhashtag", rpost.Hashtags, "Message did not update properly")
-		assert.Equal(t, model.StringArray(fileIds[0:2]), rpost.FileIds, "FileIds should not update")
+		assert.Equal(t, model.StringArray(fileIDs[0:2]), rpost.FileIds, "FileIds should not update")
 		assert.False(t, rpost.HasReactions, "HasReactions did not update properly")
 	})
 

api4/role.go

@@ -137,7 +137,7 @@ func patchRole(c *Context, w http.ResponseWriter, r *http.Request) {
 			}
 		}
 
-		*patch.Permissions = model.UniqueStrings(*patch.Permissions)
+		*patch.Permissions = model.RemoveDuplicateStrings(*patch.Permissions)
 	}
 
 	if c.App.Srv().License() != nil && isGuest && !*c.App.Srv().License().Features.GuestAccountsPermissions {

api4/role_test.go

@@ -5,6 +5,7 @@ package api4
 
 import (
 	"context"
+	"sort"
 	"strings"
 	"testing"
 
@@ -223,7 +224,9 @@ func TestPatchRole(t *testing.T) {
 		assert.Equal(t, received.Name, role.Name)
 		assert.Equal(t, received.DisplayName, role.DisplayName)
 		assert.Equal(t, received.Description, role.Description)
-		assert.EqualValues(t, received.Permissions, []string{"manage_system", "create_public_channel", "manage_incoming_webhooks", "manage_outgoing_webhooks"})
+		perms := []string{"manage_system", "create_public_channel", "manage_incoming_webhooks", "manage_outgoing_webhooks"}
+		sort.Strings(perms)
+		assert.EqualValues(t, received.Permissions, perms)
 		assert.Equal(t, received.SchemeManaged, role.SchemeManaged)
 
 		// Check a no-op patch succeeds.
@@ -252,7 +255,9 @@ func TestPatchRole(t *testing.T) {
 		assert.Equal(t, received.Name, role.Name)
 		assert.Equal(t, received.DisplayName, role.DisplayName)
 		assert.Equal(t, received.Description, role.Description)
-		assert.EqualValues(t, received.Permissions, []string{"manage_system", "manage_incoming_webhooks", "manage_outgoing_webhooks"})
+		perms := []string{"manage_system", "manage_incoming_webhooks", "manage_outgoing_webhooks"}
+		sort.Strings(perms)
+		assert.EqualValues(t, received.Permissions, perms)
 		assert.Equal(t, received.SchemeManaged, role.SchemeManaged)
 
 		t.Run("Check guest permissions editing without E20 license", func(t *testing.T) {

app/import_validators.go

@@ -259,48 +259,48 @@ func validateUserImportData(data *UserImportData) *model.AppError {
 	}
 
 	if data.NotifyProps != nil {
-		if data.NotifyProps.Desktop != nil && !model.IsValidUserNotifyLevel(*data.NotifyProps.Desktop) {
+		if data.NotifyProps.Desktop != nil && !isValidUserNotifyLevel(*data.NotifyProps.Desktop) {
 			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_desktop_invalid.error", nil, "", http.StatusBadRequest)
 		}
 
-		if data.NotifyProps.DesktopSound != nil && !model.IsValidTrueOrFalseString(*data.NotifyProps.DesktopSound) {
+		if data.NotifyProps.DesktopSound != nil && !isValidTrueOrFalseString(*data.NotifyProps.DesktopSound) {
 			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_desktop_sound_invalid.error", nil, "", http.StatusBadRequest)
 		}
 
-		if data.NotifyProps.Email != nil && !model.IsValidTrueOrFalseString(*data.NotifyProps.Email) {
+		if data.NotifyProps.Email != nil && !isValidTrueOrFalseString(*data.NotifyProps.Email) {
 			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_email_invalid.error", nil, "", http.StatusBadRequest)
 		}
 
-		if data.NotifyProps.Mobile != nil && !model.IsValidUserNotifyLevel(*data.NotifyProps.Mobile) {
+		if data.NotifyProps.Mobile != nil && !isValidUserNotifyLevel(*data.NotifyProps.Mobile) {
 			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_mobile_invalid.error", nil, "", http.StatusBadRequest)
 		}
 
-		if data.NotifyProps.MobilePushStatus != nil && !model.IsValidPushStatusNotifyLevel(*data.NotifyProps.MobilePushStatus) {
+		if data.NotifyProps.MobilePushStatus != nil && !isValidPushStatusNotifyLevel(*data.NotifyProps.MobilePushStatus) {
 			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_mobile_push_status_invalid.error", nil, "", http.StatusBadRequest)
 		}
 
-		if data.NotifyProps.ChannelTrigger != nil && !model.IsValidTrueOrFalseString(*data.NotifyProps.ChannelTrigger) {
+		if data.NotifyProps.ChannelTrigger != nil && !isValidTrueOrFalseString(*data.NotifyProps.ChannelTrigger) {
 			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_channel_trigger_invalid.error", nil, "", http.StatusBadRequest)
 		}
 
-		if data.NotifyProps.CommentsTrigger != nil && !model.IsValidCommentsNotifyLevel(*data.NotifyProps.CommentsTrigger) {
+		if data.NotifyProps.CommentsTrigger != nil && !isValidCommentsNotifyLevel(*data.NotifyProps.CommentsTrigger) {
 			return model.NewAppError("BulkImport", "app.import.validate_user_import_data.notify_props_comments_trigger_invalid.error", nil, "", http.StatusBadRequest)
 		}
 	}
 
-	if data.UseMarkdownPreview != nil && !model.IsValidTrueOrFalseString(*data.UseMarkdownPreview) {
+	if data.UseMarkdownPreview != nil && !isValidTrueOrFalseString(*data.UseMarkdownPreview) {
 		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.advanced_props_feature_markdown_preview.error", nil, "", http.StatusBadRequest)
 	}
 
-	if data.UseFormatting != nil && !model.IsValidTrueOrFalseString(*data.UseFormatting) {
+	if data.UseFormatting != nil && !isValidTrueOrFalseString(*data.UseFormatting) {
 		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.advanced_props_formatting.error", nil, "", http.StatusBadRequest)
 	}
 
-	if data.ShowUnreadSection != nil && !model.IsValidTrueOrFalseString(*data.ShowUnreadSection) {
+	if data.ShowUnreadSection != nil && !isValidTrueOrFalseString(*data.ShowUnreadSection) {
 		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.advanced_props_show_unread_section.error", nil, "", http.StatusBadRequest)
 	}
 
-	if data.EmailInterval != nil && !model.IsValidEmailBatchingInterval(*data.EmailInterval) {
+	if data.EmailInterval != nil && !isValidEmailBatchingInterval(*data.EmailInterval) {
 		return model.NewAppError("BulkImport", "app.import.validate_user_import_data.advanced_props_email_interval.error", nil, "", http.StatusBadRequest)
 	}
 
@@ -579,3 +579,31 @@ func validateEmojiImportData(data *EmojiImportData) *model.AppError {
 
 	return nil
 }
+
+func isValidTrueOrFalseString(value string) bool {
+	return value == "true" || value == "false"
+}
+
+func isValidUserNotifyLevel(notifyLevel string) bool {
+	return notifyLevel == model.ChannelNotifyAll ||
+		notifyLevel == model.ChannelNotifyMention ||
+		notifyLevel == model.ChannelNotifyNone
+}
+
+func isValidPushStatusNotifyLevel(notifyLevel string) bool {
+	return notifyLevel == model.StatusOnline ||
+		notifyLevel == model.StatusAway ||
+		notifyLevel == model.StatusOffline
+}
+
+func isValidCommentsNotifyLevel(notifyLevel string) bool {
+	return notifyLevel == model.CommentsNotifyAny ||
+		notifyLevel == model.CommentsNotifyRoot ||
+		notifyLevel == model.CommentsNotifyNever
+}
+
+func isValidEmailBatchingInterval(emailInterval string) bool {
+	return emailInterval == model.PreferenceEmailIntervalImmediately ||
+		emailInterval == model.PreferenceEmailIntervalFifteen ||
+		emailInterval == model.PreferenceEmailIntervalHour
+}

app/plugin_signature.go

@@ -43,7 +43,7 @@ func (s *Server) getPublicKey(name string) ([]byte, *model.AppError) {
 
 // AddPublicKey will add plugin public key to the config. Overwrites the previous file
 func (a *App) AddPublicKey(name string, key io.Reader) *model.AppError {
-	if model.IsSamlFile(&a.Config().SamlSettings, name) {
+	if isSamlFile(&a.Config().SamlSettings, name) {
 		return model.NewAppError("AddPublicKey", "app.plugin.modify_saml.app_error", nil, "", http.StatusInternalServerError)
 	}
 	data, err := ioutil.ReadAll(key)
@@ -66,7 +66,7 @@ func (a *App) AddPublicKey(name string, key io.Reader) *model.AppError {
 
 // DeletePublicKey will delete plugin public key from the config.
 func (a *App) DeletePublicKey(name string) *model.AppError {
-	if model.IsSamlFile(&a.Config().SamlSettings, name) {
+	if isSamlFile(&a.Config().SamlSettings, name) {
 		return model.NewAppError("AddPublicKey", "app.plugin.modify_saml.app_error", nil, "", http.StatusInternalServerError)
 	}
 	filename := filepath.Base(name)
@@ -144,3 +144,8 @@ func decodeIfArmored(reader io.Reader) (io.Reader, error) {
 	}
 	return block.Body, nil
 }
+
+// isSamlFile checks if filename is a SAML file.
+func isSamlFile(saml *model.SamlSettings, filename string) bool {
+	return filename == *saml.PublicCertificateFile || filename == *saml.PrivateKeyFile || filename == *saml.IdpCertificateFile
+}

model/config.go

@@ -1768,7 +1768,7 @@ type SupportSettings struct {
 }
 
 func (s *SupportSettings) SetDefaults() {
-	if !IsSafeLink(s.TermsOfServiceLink) {
+	if !isSafeLink(s.TermsOfServiceLink) {
 		*s.TermsOfServiceLink = SupportSettingsDefaultTermsOfServiceLink
 	}
 
@@ -1776,7 +1776,7 @@ func (s *SupportSettings) SetDefaults() {
 		s.TermsOfServiceLink = NewString(SupportSettingsDefaultTermsOfServiceLink)
 	}
 
-	if !IsSafeLink(s.PrivacyPolicyLink) {
+	if !isSafeLink(s.PrivacyPolicyLink) {
 		*s.PrivacyPolicyLink = ""
 	}
 
@@ -1784,7 +1784,7 @@ func (s *SupportSettings) SetDefaults() {
 		s.PrivacyPolicyLink = NewString(SupportSettingsDefaultPrivacyPolicyLink)
 	}
 
-	if !IsSafeLink(s.AboutLink) {
+	if !isSafeLink(s.AboutLink) {
 		*s.AboutLink = ""
 	}
 
@@ -1792,7 +1792,7 @@ func (s *SupportSettings) SetDefaults() {
 		s.AboutLink = NewString(SupportSettingsDefaultAboutLink)
 	}
 
-	if !IsSafeLink(s.HelpLink) {
+	if !isSafeLink(s.HelpLink) {
 		*s.HelpLink = ""
 	}
 
@@ -1800,7 +1800,7 @@ func (s *SupportSettings) SetDefaults() {
 		s.HelpLink = NewString(SupportSettingsDefaultHelpLink)
 	}
 
-	if !IsSafeLink(s.ReportAProblemLink) {
+	if !isSafeLink(s.ReportAProblemLink) {
 		*s.ReportAProblemLink = ""
 	}
 
@@ -3669,7 +3669,7 @@ func (s *ServiceSettings) isValid() *AppError {
 	if host == "" {
 		isValidHost = true
 	} else {
-		isValidHost = (net.ParseIP(host) != nil) || IsDomainName(host)
+		isValidHost = (net.ParseIP(host) != nil) || isDomainName(host)
 	}
 	portInt, err := strconv.Atoi(port)
 	if err != nil || !isValidHost || portInt < 0 || portInt > math.MaxUint16 {
@@ -3974,3 +3974,71 @@ func isTagPresent(tag string, tags []string) bool {
 
 	return false
 }
+
+// Copied from https://golang.org/src/net/dnsclient.go#L119
+func isDomainName(s string) bool {
+	// See RFC 1035, RFC 3696.
+	// Presentation format has dots before every label except the first, and the
+	// terminal empty label is optional here because we assume fully-qualified
+	// (absolute) input. We must therefore reserve space for the first and last
+	// labels' length octets in wire format, where they are necessary and the
+	// maximum total length is 255.
+	// So our _effective_ maximum is 253, but 254 is not rejected if the last
+	// character is a dot.
+	l := len(s)
+	if l == 0 || l > 254 || l == 254 && s[l-1] != '.' {
+		return false
+	}
+
+	last := byte('.')
+	ok := false // Ok once we've seen a letter.
+	partlen := 0
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		switch {
+		default:
+			return false
+		case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '_':
+			ok = true
+			partlen++
+		case '0' <= c && c <= '9':
+			// fine
+			partlen++
+		case c == '-':
+			// Byte before dash cannot be dot.
+			if last == '.' {
+				return false
+			}
+			partlen++
+		case c == '.':
+			// Byte before dot cannot be dot, dash.
+			if last == '.' || last == '-' {
+				return false
+			}
+			if partlen > 63 || partlen == 0 {
+				return false
+			}
+			partlen = 0
+		}
+		last = c
+	}
+	if last == '-' || partlen > 63 {
+		return false
+	}
+
+	return ok
+}
+
+func isSafeLink(link *string) bool {
+	if link != nil {
+		if IsValidHttpUrl(*link) {
+			return true
+		} else if strings.HasPrefix(*link, "/") {
+			return true
+		} else {
+			return false
+		}
+	}
+
+	return true
+}

model/role.go

@@ -443,8 +443,8 @@ func (r *Role) Patch(patch *RolePatch) {
 func (r *Role) MergeChannelHigherScopedPermissions(higherScopedPermissions *RolePermissions) {
 	mergedPermissions := []string{}
 
-	higherScopedPermissionsMap := AsStringBoolMap(higherScopedPermissions.Permissions)
-	rolePermissionsMap := AsStringBoolMap(r.Permissions)
+	higherScopedPermissionsMap := asStringBoolMap(higherScopedPermissions.Permissions)
+	rolePermissionsMap := asStringBoolMap(r.Permissions)
 
 	for _, cp := range AllPermissions {
 		if cp.Scope != PermissionScopeChannel {
@@ -950,3 +950,11 @@ func AddAncillaryPermissions(permissions []string) []string {
 	}
 	return permissions
 }
+
+func asStringBoolMap(list []string) map[string]bool {
+	listMap := make(map[string]bool, len(list))
+	for _, p := range list {
+		listMap[p] = true
+	}
+	return listMap
+}

model/team.go

@@ -235,7 +235,7 @@ func IsReservedTeamName(s string) bool {
 }
 
 func IsValidTeamName(s string) bool {
-	if !IsValidAlphaNum(s) {
+	if !isValidAlphaNum(s) {
 		return false
 	}
 

model/user.go

@@ -931,30 +931,6 @@ func CleanUsername(username string) string {
 	return s
 }
 
-func IsValidUserNotifyLevel(notifyLevel string) bool {
-	return notifyLevel == ChannelNotifyAll ||
-		notifyLevel == ChannelNotifyMention ||
-		notifyLevel == ChannelNotifyNone
-}
-
-func IsValidPushStatusNotifyLevel(notifyLevel string) bool {
-	return notifyLevel == StatusOnline ||
-		notifyLevel == StatusAway ||
-		notifyLevel == StatusOffline
-}
-
-func IsValidCommentsNotifyLevel(notifyLevel string) bool {
-	return notifyLevel == CommentsNotifyAny ||
-		notifyLevel == CommentsNotifyRoot ||
-		notifyLevel == CommentsNotifyNever
-}
-
-func IsValidEmailBatchingInterval(emailInterval string) bool {
-	return emailInterval == PreferenceEmailIntervalImmediately ||
-		emailInterval == PreferenceEmailIntervalFifteen ||
-		emailInterval == PreferenceEmailIntervalHour
-}
-
 func IsValidLocale(locale string) bool {
 	if locale != "" {
 		if len(locale) > UserLocaleMaxLength {

model/utils.go

@@ -16,7 +16,7 @@ import (
 	"net/mail"
 	"net/url"
 	"regexp"
-	"strconv"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -227,7 +227,7 @@ func GetEndOfDayMillis(thisTime time.Time, timeZoneOffset int) int64 {
 }
 
 func CopyStringMap(originalMap map[string]string) map[string]string {
-	copyMap := make(map[string]string)
+	copyMap := make(map[string]string, len(originalMap))
 	for k, v := range originalMap {
 		copyMap[k] = v
 	}
@@ -315,21 +315,6 @@ func StringInterfaceFromJson(data io.Reader) map[string]interface{} {
 	return objmap
 }
 
-func StringToJson(s string) string {
-	b, _ := json.Marshal(s)
-	return string(b)
-}
-
-func StringFromJson(data io.Reader) string {
-	decoder := json.NewDecoder(data)
-
-	var s string
-	if err := decoder.Decode(&s); err != nil {
-		return ""
-	}
-	return s
-}
-
 // ToJson serializes an arbitrary data type to JSON, discarding the error.
 func ToJson(v interface{}) []byte {
 	b, _ := json.Marshal(v)
@@ -372,12 +357,12 @@ func GetServerIpAddress(iface string) string {
 	return ""
 }
 
-func IsLower(s string) bool {
+func isLower(s string) bool {
 	return strings.ToLower(s) == s
 }
 
 func IsValidEmail(email string) bool {
-	if !IsLower(email) {
+	if !isLower(email) {
 		return false
 	}
 
@@ -422,25 +407,25 @@ func IsValidChannelIdentifier(s string) bool {
 	return true
 }
 
-func IsValidAlphaNum(s string) bool {
-	validAlphaNum := regexp.MustCompile(`^[a-z0-9]+([a-z\-0-9]+|(__)?)[a-z0-9]+$`)
+var (
+	validAlphaNum                           = regexp.MustCompile(`^[a-z0-9]+([a-z\-0-9]+|(__)?)[a-z0-9]+$`)
+	validAlphaNumHyphenUnderscore           = regexp.MustCompile(`^[a-z0-9]+([a-z\-\_0-9]+|(__)?)[a-z0-9]+$`)
+	validSimpleAlphaNumHyphenUnderscore     = regexp.MustCompile(`^[a-zA-Z0-9\-_]+$`)
+	validSimpleAlphaNumHyphenUnderscorePlus = regexp.MustCompile(`^[a-zA-Z0-9+_-]+$`)
+)
 
+func isValidAlphaNum(s string) bool {
 	return validAlphaNum.MatchString(s)
 }
 
 func IsValidAlphaNumHyphenUnderscore(s string, withFormat bool) bool {
 	if withFormat {
-		validAlphaNumHyphenUnderscore := regexp.MustCompile(`^[a-z0-9]+([a-z\-\_0-9]+|(__)?)[a-z0-9]+$`)
 		return validAlphaNumHyphenUnderscore.MatchString(s)
 	}
-
-	validSimpleAlphaNumHyphenUnderscore := regexp.MustCompile(`^[a-zA-Z0-9\-_]+$`)
 	return validSimpleAlphaNumHyphenUnderscore.MatchString(s)
 }
 
 func IsValidAlphaNumHyphenUnderscorePlus(s string) bool {
-
-	validSimpleAlphaNumHyphenUnderscorePlus := regexp.MustCompile(`^[a-zA-Z0-9+_-]+$`)
 	return validSimpleAlphaNumHyphenUnderscorePlus.MatchString(s)
 }
 
@@ -455,10 +440,12 @@ func Etag(parts ...interface{}) string {
 	return etag
 }
 
-var validHashtag = regexp.MustCompile(`^(#\pL[\pL\d\-_.]*[\pL\d])$`)
-var puncStart = regexp.MustCompile(`^[^\pL\d\s#]+`)
-var hashtagStart = regexp.MustCompile(`^#{2,}`)
-var puncEnd = regexp.MustCompile(`[^\pL\d\s]+$`)
+var (
+	validHashtag = regexp.MustCompile(`^(#\pL[\pL\d\-_.]*[\pL\d])$`)
+	puncStart    = regexp.MustCompile(`^[^\pL\d\s#]+`)
+	hashtagStart = regexp.MustCompile(`^#{2,}`)
+	puncEnd      = regexp.MustCompile(`[^\pL\d\s]+$`)
+)
 
 func ParseHashtags(text string) (string, string) {
 	words := strings.Fields(text)
@@ -511,56 +498,6 @@ func IsValidHttpUrl(rawUrl string) bool {
 	return true
 }
 
-func IsValidTurnOrStunServer(rawUri string) bool {
-	if strings.Index(rawUri, "turn:") != 0 && strings.Index(rawUri, "stun:") != 0 {
-		return false
-	}
-
-	if _, err := url.ParseRequestURI(rawUri); err != nil {
-		return false
-	}
-
-	return true
-}
-
-func IsSafeLink(link *string) bool {
-	if link != nil {
-		if IsValidHttpUrl(*link) {
-			return true
-		} else if strings.HasPrefix(*link, "/") {
-			return true
-		} else {
-			return false
-		}
-	}
-
-	return true
-}
-
-func IsValidWebsocketUrl(rawUrl string) bool {
-	if strings.Index(rawUrl, "ws://") != 0 && strings.Index(rawUrl, "wss://") != 0 {
-		return false
-	}
-
-	if _, err := url.ParseRequestURI(rawUrl); err != nil {
-		return false
-	}
-
-	return true
-}
-
-func IsValidTrueOrFalseString(value string) bool {
-	return value == "true" || value == "false"
-}
-
-func IsValidNumberString(value string) bool {
-	if _, err := strconv.Atoi(value); err != nil {
-		return false
-	}
-
-	return true
-}
-
 func IsValidId(value string) bool {
 	if len(value) != 26 {
 		return false
@@ -575,73 +512,24 @@ func IsValidId(value string) bool {
 	return true
 }
 
-// Copied from https://golang.org/src/net/dnsclient.go#L119
-func IsDomainName(s string) bool {
-	// See RFC 1035, RFC 3696.
-	// Presentation format has dots before every label except the first, and the
-	// terminal empty label is optional here because we assume fully-qualified
-	// (absolute) input. We must therefore reserve space for the first and last
-	// labels' length octets in wire format, where they are necessary and the
-	// maximum total length is 255.
-	// So our _effective_ maximum is 253, but 254 is not rejected if the last
-	// character is a dot.
-	l := len(s)
-	if l == 0 || l > 254 || l == 254 && s[l-1] != '.' {
-		return false
-	}
-
-	last := byte('.')
-	ok := false // Ok once we've seen a letter.
-	partlen := 0
-	for i := 0; i < len(s); i++ {
-		c := s[i]
-		switch {
-		default:
-			return false
-		case 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '_':
-			ok = true
-			partlen++
-		case '0' <= c && c <= '9':
-			// fine
-			partlen++
-		case c == '-':
-			// Byte before dash cannot be dot.
-			if last == '.' {
-				return false
-			}
-			partlen++
-		case c == '.':
-			// Byte before dot cannot be dot, dash.
-			if last == '.' || last == '-' {
-				return false
-			}
-			if partlen > 63 || partlen == 0 {
-				return false
-			}
-			partlen = 0
-		}
-		last = c
-	}
-	if last == '-' || partlen > 63 {
-		return false
-	}
-
-	return ok
-}
-
+// RemoveDuplicateStrings does an in-place removal of duplicate strings
+// from the input slice. The original slice gets modified.
 func RemoveDuplicateStrings(in []string) []string {
-	out := []string{}
-	seen := make(map[string]bool, len(in))
-
-	for _, item := range in {
-		if !seen[item] {
-			out = append(out, item)
-
-			seen[item] = true
-		}
+	// In-place de-dup.
+	// Copied from https://github.com/golang/go/wiki/SliceTricks#in-place-deduplicate-comparable
+	if len(in) == 0 {
+		return in
 	}
-
-	return out
+	sort.Strings(in)
+	j := 0
+	for i := 1; i < len(in); i++ {
+		if in[j] == in[i] {
+			continue
+		}
+		j++
+		in[j] = in[i]
+	}
+	return in[:j+1]
 }
 
 func GetPreferredTimezone(timezone StringMap) string {
@@ -652,19 +540,6 @@ func GetPreferredTimezone(timezone StringMap) string {
 	return timezone["manualTimezone"]
 }
 
-// IsSamlFile checks if filename is a SAML file.
-func IsSamlFile(saml *SamlSettings, filename string) bool {
-	return filename == *saml.PublicCertificateFile || filename == *saml.PrivateKeyFile || filename == *saml.IdpCertificateFile
-}
-
-func AsStringBoolMap(list []string) map[string]bool {
-	listMap := map[string]bool{}
-	for _, p := range list {
-		listMap[p] = true
-	}
-	return listMap
-}
-
 // SanitizeUnicode will remove undesirable Unicode characters from a string.
 func SanitizeUnicode(s string) string {
 	return strings.Map(filterBlocklist, s)
@@ -709,18 +584,3 @@ func filterBlocklist(r rune) rune {
 
 	return r
 }
-
-// UniqueStrings returns a unique subset of the string slice provided.
-func UniqueStrings(input []string) []string {
-	u := make([]string, 0, len(input))
-	m := make(map[string]bool)
-
-	for _, val := range input {
-		if _, ok := m[val]; !ok {
-			m[val] = true
-			u = append(u, val)
-		}
-	}
-
-	return u
-}

model/utils_test.go

@@ -338,7 +338,7 @@ func TestIsValidAlphaNum(t *testing.T) {
 	}
 
 	for _, tc := range cases {
-		actual := IsValidAlphaNum(tc.Input)
+		actual := isValidAlphaNum(tc.Input)
 		require.Equalf(t, actual, tc.Result, "case: %v\tshould returned: %#v", tc, tc.Result)
 	}
 }
@@ -945,7 +945,7 @@ func TestIsValidHttpUrl(t *testing.T) {
 	}
 }
 
-func TestUniqueStrings(t *testing.T) {
+func TestRemoveDuplicateStrings(t *testing.T) {
 	cases := []struct {
 		Input  []string
 		Result []string
@@ -973,7 +973,7 @@ func TestUniqueStrings(t *testing.T) {
 	}
 
 	for _, tc := range cases {
-		actual := UniqueStrings(tc.Input)
+		actual := RemoveDuplicateStrings(tc.Input)
 		require.Equalf(t, actual, tc.Result, "case: %v\tshould returned: %#v", tc, tc.Result)
 	}
 }