cups: add comprehensive CUPs setting page

- Add printers
- Delete printers
- Use polkit APIs as fallback on auth errors
- Fix ref system to conditionally subscribe to cups when wanted

core/pkg/ipp/constants.go

@@ -288,6 +288,7 @@ const (
 // useful mime types for ipp
 const (
 	MimeTypePostscript  = "application/postscript"
+	MimeTypePDF         = "application/pdf"
 	MimeTypeOctetStream = "application/octet-stream"
 )
 

core/pkg/ipp/cups-client.go

@@ -1,7 +1,7 @@
 package ipp
 
 import (
-	"bytes"
+	"io"
 	"strings"
 )
 
@@ -300,22 +300,13 @@ func (c *CUPSClient) GetClasses(attributes []string) (map[string]Attributes, err
 	return printerNameMap, nil
 }
 
-// PrintTestPage prints a test page of type application/vnd.cups-pdf-banner
-func (c *CUPSClient) PrintTestPage(printer string) (int, error) {
-	testPage := new(bytes.Buffer)
-	testPage.WriteString("#PDF-BANNER\n")
-	testPage.WriteString("Template default-testpage.pdf\n")
-	testPage.WriteString("Show printer-name printer-info printer-location printer-make-and-model printer-driver-name")
-	testPage.WriteString("printer-driver-version paper-size imageable-area job-id options time-at-creation")
-	testPage.WriteString("time-at-processing\n\n")
-
-	return c.PrintDocuments([]Document{
-		{
-			Document: testPage,
-			Name:     "Test Page",
-			Size:     testPage.Len(),
-			MimeType: MimeTypePostscript,
-		},
+// PrintTestPage prints a test page using the provided PDF data
+func (c *CUPSClient) PrintTestPage(printer string, testPageData io.Reader, size int) (int, error) {
+	return c.PrintJob(Document{
+		Document: testPageData,
+		Name:     "Test Page",
+		Size:     size,
+		MimeType: MimeTypePDF,
 	}, printer, map[string]interface{}{
 		AttributeJobName: "Test Page",
 	})