Disable add key button if SSH is disabled (#2873)

models/error.go

 	return fmt.Sprintf("name pattern is not allowed [pattern: %s]", err.Pattern)
 }
 
+// ErrSSHDisabled represents an "SSH disabled" error.
+type ErrSSHDisabled struct {
+}
+
+// IsErrSSHDisabled checks if an error is a ErrSSHDisabled.
+func IsErrSSHDisabled(err error) bool {
+	_, ok := err.(ErrSSHDisabled)
+	return ok
+}
+
+func (err ErrSSHDisabled) Error() string {
+	return "SSH is disabled"
+}
+
 //  ____ ___
 // |    |   \______ ___________
 // |    |   /  ___// __ \_  __ \

models/ssh_key.go

 // It returns the actual public key line on success.
 func CheckPublicKeyString(content string) (_ string, err error) {
 	if setting.SSH.Disabled {
-		return "", errors.New("SSH is disabled")
+		return "", ErrSSHDisabled{}
 	}
 
 	content, err = parseKeyString(content)

options/locale/locale_en-US.ini

 token_state_desc = This token has been used in the last 7 days
 show_openid = Show on profile
 hide_openid = Hide from profile
+ssh_disabled = SSH is disabled
 
 manage_social = Manage Associated Social Accounts
 social_desc = This is a list of associated social accounts. For security reasons, please make sure you recognize all of these entries, as they can be used to log in to your account.

routers/api/v1/repo/key.go

 
 // HandleCheckKeyStringError handle check key error
 func HandleCheckKeyStringError(ctx *context.APIContext, err error) {
-	if models.IsErrKeyUnableVerify(err) {
+	if models.IsErrSSHDisabled(err) {
+		ctx.Error(422, "", "SSH is disabled")
+	} else if models.IsErrKeyUnableVerify(err) {
 		ctx.Error(422, "", "Unable to verify key content")
 	} else {
 		ctx.Error(422, "", fmt.Errorf("Invalid key content: %v", err))

routers/repo/setting.go

 func DeployKeys(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("repo.settings.deploy_keys")
 	ctx.Data["PageIsSettingsKeys"] = true
+	ctx.Data["DisableSSH"] = setting.SSH.Disabled
 
 	keys, err := models.ListDeployKeys(ctx.Repo.Repository.ID)
 	if err != nil {
 
 	content, err := models.CheckPublicKeyString(form.Content)
 	if err != nil {
-		if models.IsErrKeyUnableVerify(err) {
+		if models.IsErrSSHDisabled(err) {
+			ctx.Flash.Info(ctx.Tr("settings.ssh_disabled"))
+		} else if models.IsErrKeyUnableVerify(err) {
 			ctx.Flash.Info(ctx.Tr("form.unable_verify_ssh_key"))
 		} else {
 			ctx.Data["HasError"] = true
 			ctx.Data["Err_Content"] = true
 			ctx.Flash.Error(ctx.Tr("form.invalid_ssh_key", err.Error()))
-			ctx.Redirect(ctx.Repo.RepoLink + "/settings/keys")
-			return
 		}
+		ctx.Redirect(ctx.Repo.RepoLink + "/settings/keys")
+		return
 	}
 
 	key, err := models.AddDeployKey(ctx.Repo.Repository.ID, form.Title, content)

routers/user/setting.go

 func SettingsKeys(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("settings")
 	ctx.Data["PageIsSettingsKeys"] = true
+	ctx.Data["DisableSSH"] = setting.SSH.Disabled
 
 	keys, err := models.ListPublicKeys(ctx.User.ID)
 	if err != nil {
 	case "ssh":
 		content, err := models.CheckPublicKeyString(form.Content)
 		if err != nil {
-			if models.IsErrKeyUnableVerify(err) {
+			if models.IsErrSSHDisabled(err) {
+				ctx.Flash.Info(ctx.Tr("settings.ssh_disabled"))
+			} else if models.IsErrKeyUnableVerify(err) {
 				ctx.Flash.Info(ctx.Tr("form.unable_verify_ssh_key"))
 			} else {
 				ctx.Flash.Error(ctx.Tr("form.invalid_ssh_key", err.Error()))
-				ctx.Redirect(setting.AppSubURL + "/user/settings/keys")
-				return
 			}
+			ctx.Redirect(setting.AppSubURL + "/user/settings/keys")
+			return
 		}
 
 		if _, err = models.AddPublicKey(ctx.User.ID, form.Title, content); err != nil {

templates/repo/settings/deploy_keys.tmpl

 		<h4 class="ui top attached header">
 			{{.i18n.Tr "repo.settings.deploy_keys"}}
 			<div class="ui right">
+			{{if not .DisableSSH}}
 				<div class="ui blue tiny show-panel button" data-panel="#add-deploy-key-panel">{{.i18n.Tr "repo.settings.add_deploy_key"}}</div>
+			{{else}}
+				<div class="ui blue tiny button disabled">{{.i18n.Tr "settings.ssh_disabled"}}</div>
+			{{end}}
 			</div>
 		</h4>
 		<div class="ui attached segment">

templates/user/settings/keys_ssh.tmpl

 <h4 class="ui top attached header">
   {{.i18n.Tr "settings.manage_ssh_keys"}}
   <div class="ui right">
+  {{if not .DisableSSH}}
     <div class="ui blue tiny show-panel button" data-panel="#add-ssh-key-panel">{{.i18n.Tr "settings.add_key"}}</div>
+  {{else}}
+    <div class="ui blue tiny button disabled">{{.i18n.Tr "settings.ssh_disabled"}}</div>
+  {{end}}
   </div>
 </h4>
 <div class="ui attached segment">