add GetEqualFold(Raw|)AttributeValue(s|)

these are the case insensitive counter parts, e.g.
  GetAttributeValue <=> GetEqualFoldAttributeValue
using strings.EqualFold to compare the attrribute names

fixes go-ldap#109 go-ldap#129

search.go

@@ -132,6 +132,17 @@ func (e *Entry) GetAttributeValues(attribute string) []string {
 	return []string{}
 }
 
+// GetEqualFoldAttributeValues returns the values for the named attribute, or an
+// empty list. Attribute matching is done with strings.EqualFold.
+func (e *Entry) GetEqualFoldAttributeValues(attribute string) []string {
+	for _, attr := range e.Attributes {
+		if strings.EqualFold(attribute, attr.Name) {
+			return attr.Values
+		}
+	}
+	return []string{}
+}
+
 // GetRawAttributeValues returns the byte values for the named attribute, or an empty list
 func (e *Entry) GetRawAttributeValues(attribute string) [][]byte {
 	for _, attr := range e.Attributes {
@@ -142,6 +153,16 @@ func (e *Entry) GetRawAttributeValues(attribute string) [][]byte {
 	return [][]byte{}
 }
 
+// GetEqualFoldRawAttributeValues returns the byte values for the named attribute, or an empty list
+func (e *Entry) GetEqualFoldRawAttributeValues(attribute string) [][]byte {
+	for _, attr := range e.Attributes {
+		if strings.EqualFold(attr.Name, attribute) {
+			return attr.ByteValues
+		}
+	}
+	return [][]byte{}
+}
+
 // GetAttributeValue returns the first value for the named attribute, or ""
 func (e *Entry) GetAttributeValue(attribute string) string {
 	values := e.GetAttributeValues(attribute)
@@ -151,6 +172,16 @@ func (e *Entry) GetAttributeValue(attribute string) string {
 	return values[0]
 }
 
+// GetEqualFoldAttributeValue returns the first value for the named attribute, or "".
+// Attribute comparison is done with strings.EqualFold.
+func (e *Entry) GetEqualFoldAttributeValue(attribute string) string {
+	values := e.GetEqualFoldAttributeValues(attribute)
+	if len(values) == 0 {
+		return ""
+	}
+	return values[0]
+}
+
 // GetRawAttributeValue returns the first value for the named attribute, or an empty slice
 func (e *Entry) GetRawAttributeValue(attribute string) []byte {
 	values := e.GetRawAttributeValues(attribute)
@@ -160,6 +191,15 @@ func (e *Entry) GetRawAttributeValue(attribute string) []byte {
 	return values[0]
 }
 
+// GetEqualFoldRawAttributeValue returns the first value for the named attribute, or an empty slice
+func (e *Entry) GetEqualFoldRawAttributeValue(attribute string) []byte {
+	values := e.GetEqualFoldRawAttributeValues(attribute)
+	if len(values) == 0 {
+		return []byte{}
+	}
+	return values[0]
+}
+
 // Print outputs a human-readable description
 func (e *Entry) Print() {
 	fmt.Printf("DN: %s\n", e.DN)

search_test.go

@@ -29,3 +29,22 @@ func TestNewEntry(t *testing.T) {
 		iteration = iteration + 1
 	}
 }
+
+func TestGetAttributeValue(t *testing.T) {
+	dn := "testDN"
+	attributes := map[string][]string{
+		"Alpha":   {"value"},
+		"bEta":    {"value"},
+		"gaMma":   {"value"},
+		"delTa":   {"value"},
+		"epsiLon": {"value"},
+	}
+	entry := NewEntry(dn, attributes)
+	if entry.GetAttributeValue("Alpha") != "value" {
+		t.Errorf("failed to get attribute in original case")
+	}
+
+	if entry.GetEqualFoldAttributeValue("alpha") != "value" {
+		t.Errorf("failed to get attribute in changed case")
+	}
+}