A working proxy exists.

packages/ipp/messages.go

@@ -1,9 +1,11 @@
 //Package ipp provides functonality to handle ipp messages
+//go:generate stringer -type jobState -type printerState
 package ipp
 
 import (
 	"bufio"
 	"encoding/binary"
+	"errors"
 	"fmt"
 	"io"
 
@@ -14,6 +16,9 @@ import (
 // https://tools.ietf.org/html/rfc8010
 // https://tools.ietf.org/html/rfc8011
 
+// ErrNilAttribute is returned when an attempt to use nil as a attribute
+var ErrNilAttribute = errors.New("can not add use nil as attribute")
+
 // Defined value tags
 // from rfc8010
 type tag uint8
@@ -89,12 +94,27 @@ const (
 	Stopped    printerState = 5
 )
 
+// jobstate defined in rfc8011 ch 5.3.7
+type jobState uint16
+
+const (
+	pending            jobState = 3
+	pendingHeld        jobState = 4
+	processing         jobState = 5
+	processingStoppped jobState = 6
+	cancelled          jobState = 7
+	aborted            jobState = 8
+	completed          jobState = 9
+)
+
 type statusCode uint16
 
 // status code defenitions
 const (
-	SuccessfulOk          statusCode = 0x0000
-	ClientErrorBadRequest statusCode = 0x0400
+	SuccessfulOk                               statusCode = 0x0000
+	SuccessfulOkIgnoredOrSubstitutedAttributes statusCode = 0x0001
+	SuccessfulOkConflictingAttributes          statusCode = 0x0002
+	ClientErrorBadRequest                      statusCode = 0x0400
 )
 
 type versionNumber uint16
@@ -148,13 +168,14 @@ type Attribute interface {
 	//size() int
 }
 
-type attributes struct {
-	operation []Attribute
-	printer   []Attribute
-	job       []Attribute
+type Attributes struct {
+	operation   []Attribute
+	printer     []Attribute
+	job         []Attribute
+	unsupported []Attribute
 }
 
-func (a *attributes) String() string {
+func (a *Attributes) String() string {
 	s := " OperationAttributes" + "\n"
 	for _, a := range a.operation {
 		s = s + fmt.Sprintf("  %v  (%v)\n", a, a.valueTag())
@@ -167,10 +188,15 @@ func (a *attributes) String() string {
 	for _, a := range a.job {
 		s = s + fmt.Sprintf("  %v  (%v)\n", a, a.valueTag())
 	}
+	s = s + " Unsupported" + "\n"
+	for _, a := range a.unsupported {
+		s = s + fmt.Sprintf("  %v  (%v)\n", a, a.valueTag())
+	}
+
 	return s
 }
 
-func (a *attributes) addAttribute(group tag, attr Attribute) {
+func (a *Attributes) addAttribute(group tag, attr Attribute) {
 	switch group {
 	case operationAttributes:
 		a.operation = append(a.operation, attr)
@@ -178,13 +204,15 @@ func (a *attributes) addAttribute(group tag, attr Attribute) {
 		a.job = append(a.job, attr)
 	case printerAttributes:
 		a.printer = append(a.printer, attr)
+	case unsupportedAttributes:
+		a.unsupported = append(a.unsupported, attr)
 	default:
-		log.Error("Unknown attribute group")
+		log.Errorf("Unknown attribute group %v", group)
 	}
 }
 
-func UnMarshalAttributes(bytestream *bufio.Reader) *attributes {
-	a := new(attributes)
+func UnMarshalAttributes(bytestream *bufio.Reader) *Attributes {
+	a := new(Attributes)
 
 	var t tag
 	err := binary.Read(bytestream, binary.BigEndian, &t)
@@ -290,6 +318,11 @@ func UnMarshalAttributes(bytestream *bufio.Reader) *attributes {
 		case begCollectionValueTag:
 			// For now just consume the collection
 			consumeCollection(bytestream)
+		case unsupportedValueTag:
+			attr := NewUnsupportedValue()
+			attr.unmarshal(bytestream)
+			a.addAttribute(currentAttributeGroup, attr)
+
 		case jobAttributes:
 			log.Debug("Start job attributes")
 			currentAttributeGroup = jobAttributes
@@ -299,8 +332,11 @@ func UnMarshalAttributes(bytestream *bufio.Reader) *attributes {
 		case operationAttributes:
 			log.Debug("Start operation attributes")
 			currentAttributeGroup = operationAttributes
+		case unsupportedAttributes:
+			log.Debug("Start unsupported attributes")
+			currentAttributeGroup = unsupportedAttributes
 		case resolutionValueTag:
-			res := NewResolution("", 0, 0)
+			res := NewSetOfResolution("")
 			res.unmarshal(bytestream)
 			a.addAttribute(currentAttributeGroup, res)
 			log.Debugf("Resolution %v", res)