FIX: Show the SMTP authentication error for group UI (#27914)

Originally in 964da21817
we hid the SMTPAuthenticationError message except in
very specific cases. However this message often contains
helpful information from the mail provider, for example
here is a response from Office365:

> 535 5.7.139 Authentication unsuccessful, user is locked by your
organization's security defaults policy. Contact your administrator.

So, we will show the error message in the modal UI instead
of supressing it with a generic message to be more helpful.

app/services/email_settings_exception_handler.rb

@@ -75,7 +75,18 @@ class EmailSettingsExceptionHandler
     end
 
     def net_smtp_authentication_error
-      I18n.t("email_settings.smtp_authentication_error")
+      # Generally SMTP authentication errors are due to invalid credentials,
+      # and most common mail servers provide more detailed error messages,
+      # so it should be safe to return the error message as is.
+      #
+      # Example: Office 365 returns:
+      #
+      # 535 5.7.139 Authentication unsuccessful, user is locked by your organization's security defaults policy. Contact your administrator.
+      #
+      # Example: Gmail returns:
+      #
+      # Application-specific password required. Learn more at https://support.google.com/accounts/answer/185833
+      I18n.t("email_settings.smtp_authentication_error", message: @exception.message)
     end
 
     def net_smtp_server_busy
@@ -99,33 +110,7 @@ class EmailSettingsExceptionHandler
     end
   end
 
-  class GmailProvider < GenericProvider
-    def net_smtp_authentication_error
-      # Gmail requires use of application-specific passwords when 2FA is enabled and return
-      # a special error message calling this out.
-      if @exception.message.match(/Application-specific password required/)
-        I18n.t("email_settings.authentication_error_gmail_app_password")
-      else
-        super
-      end
-    end
-
-    def net_imap_no_response_error
-      # Gmail requires use of application-specific passwords when 2FA is enabled and return
-      # a special error message calling this out.
-      if @exception.message.match(/Application-specific password required/)
-        I18n.t("email_settings.authentication_error_gmail_app_password")
-      else
-        super
-      end
-    end
-  end
-
   def self.friendly_exception_message(exception, host)
-    if host.include?("gmail.com")
-      EmailSettingsExceptionHandler::GmailProvider.new(exception).message
-    else
-      EmailSettingsExceptionHandler::GenericProvider.new(exception).message
-    end
+    EmailSettingsExceptionHandler::GenericProvider.new(exception).message
   end
 end

config/locales/server.en.yml

@@ -1123,8 +1123,7 @@ en:
     pop3_authentication_error: "There was an issue with the POP3 credentials provided, check the username and password and try again."
     imap_authentication_error: "There was an issue with the IMAP credentials provided, check the username and password and try again."
     imap_no_response_error: "An error occurred when communicating with the IMAP server. %{message}"
-    smtp_authentication_error: "There was an issue with the SMTP credentials provided, check the username and password and try again."
-    authentication_error_gmail_app_password: 'Application-specific password required. Learn more at <a target="_blank" href="https://support.google.com/accounts/answer/185833">this Google Help article</a>'
+    smtp_authentication_error: "There was an issue with the SMTP credentials provided, check the username and password and try again. %{message}"
     smtp_server_busy_error: "The SMTP server is currently busy, try again later."
     smtp_unhandled_error: "There was an unhandled error when communicating with the SMTP server. %{message}"
     imap_unhandled_error: "There was an unhandled error when communicating with the IMAP server. %{message}"

spec/requests/groups_controller_spec.rb

@@ -2799,7 +2799,7 @@ RSpec.describe GroupsController do
           post "/groups/#{group.id}/test_email_settings.json", params: params
           expect(response.status).to eq(422)
           expect(response.parsed_body["errors"]).to include(
-            I18n.t("email_settings.smtp_authentication_error"),
+            I18n.t("email_settings.smtp_authentication_error", message: "Invalid credentials"),
           )
         end
       end

spec/services/email_settings_exception_handler_spec.rb

@@ -23,28 +23,10 @@ RSpec.describe EmailSettingsExceptionHandler do
       )
     end
 
-    it "formats a general Net::IMAP::NoResponseError with application-specific password Gmail error" do
-      exception =
-        Net::IMAP::NoResponseError.new(
-          stub(data: stub(text: "NO Application-specific password required")),
-        )
-      expect(described_class.friendly_exception_message(exception, "imap.gmail.com")).to eq(
-        I18n.t("email_settings.authentication_error_gmail_app_password"),
-      )
-    end
-
     it "formats a Net::SMTPAuthenticationError" do
       exception = Net::SMTPAuthenticationError.new("invalid credentials")
       expect(described_class.friendly_exception_message(exception, "smtp.test.com")).to eq(
-        I18n.t("email_settings.smtp_authentication_error"),
-      )
-    end
-
-    it "formats a Net::SMTPAuthenticationError with application-specific password Gmail error" do
-      exception =
-        Net::SMTPAuthenticationError.new(nil, message: "Application-specific password required")
-      expect(described_class.friendly_exception_message(exception, "smtp.gmail.com")).to eq(
-        I18n.t("email_settings.authentication_error_gmail_app_password"),
+        I18n.t("email_settings.smtp_authentication_error", message: "invalid credentials"),
       )
     end
 

spec/services/problem_check/group_email_credentials_spec.rb

@@ -45,7 +45,14 @@ RSpec.describe ProblemCheck::GroupEmailCredentials do
             target: group2.id,
             priority: "high",
             message:
-              "There was an issue with the email credentials for the group <a href=\"/g/#{group2.name}/manage/email\"></a>. No emails will be sent from the group inbox until this problem is addressed. There was an issue with the SMTP credentials provided, check the username and password and try again.",
+              I18n.t(
+                "dashboard.problem.group_email_credentials",
+                base_path: Discourse.base_path,
+                group_name: group2.name,
+                group_full_name: group2.full_name,
+                error:
+                  I18n.t("email_settings.smtp_authentication_error", message: "bad credentials"),
+              ),
           ),
         )
       end
@@ -63,7 +70,14 @@ RSpec.describe ProblemCheck::GroupEmailCredentials do
             target: group3.id,
             priority: "high",
             message:
-              "There was an issue with the email credentials for the group <a href=\"/g/#{group3.name}/manage/email\"></a>. No emails will be sent from the group inbox until this problem is addressed. There was an issue with the IMAP credentials provided, check the username and password and try again.",
+              I18n.t(
+                "dashboard.problem.group_email_credentials",
+                base_path: Discourse.base_path,
+                group_name: group3.name,
+                group_full_name: group3.full_name,
+                error:
+                  I18n.t("email_settings.imap_authentication_error", message: "bad credentials"),
+              ),
           ),
         )
       end