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sed.go
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sed.go
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package sed
import (
"regexp"
"github.com/zalando/skipper/filters"
)
const (
// Deprecated, use filters.SedName instead
Name = filters.SedName
// Deprecated, use filters.SedDelimName instead
NameDelimit = filters.SedDelimName
// Deprecated, use filters.SedRequestName instead
NameRequest = filters.SedRequestName
// Deprecated, use filters.SedRequestDelimName instead
NameRequestDelimit = filters.SedRequestDelimName
)
type typ int
const (
simple typ = iota
delimited
simpleRequest
delimitedRequest
)
type spec struct {
typ typ
}
type filter struct {
typ typ
pattern *regexp.Regexp
replacement []byte
delimiter []byte
maxEditorBuffer int
maxBufferHandling maxBufferHandling
}
func ofType(t typ) spec {
return spec{typ: t}
}
// New creates a filter specficiation for the sed() filter.
func New() filters.Spec {
return ofType(simple)
}
// NewDelimited creates a filter specficiation for the sedDelim() filter.
func NewDelimited() filters.Spec {
return ofType(delimited)
}
// NewRequest creates a filter specficiation for the sedRequest() filter.
func NewRequest() filters.Spec {
return ofType(simpleRequest)
}
// NewDelimitedRequest creates a filter specficiation for the sedRequestDelim() filter.
func NewDelimitedRequest() filters.Spec {
return ofType(delimitedRequest)
}
func (s spec) Name() string {
switch s.typ {
case delimited:
return filters.SedDelimName
case simpleRequest:
return filters.SedRequestName
case delimitedRequest:
return filters.SedRequestDelimName
default:
return filters.SedName
}
}
func parseMaxBufferHandling(h interface{}) (maxBufferHandling, error) {
switch h {
case "best-effort":
return maxBufferBestEffort, nil
case "abort":
return maxBufferAbort, nil
default:
return 0, filters.ErrInvalidFilterParameters
}
}
func (s spec) CreateFilter(args []interface{}) (filters.Filter, error) {
if len(args) < 2 {
return nil, filters.ErrInvalidFilterParameters
}
pattern, ok := args[0].(string)
if !ok {
return nil, filters.ErrInvalidFilterParameters
}
patternRx, err := regexp.Compile(pattern)
if err != nil {
return nil, err
}
replacement, ok := args[1].(string)
if !ok {
return nil, filters.ErrInvalidFilterParameters
}
f := &filter{
typ: s.typ,
pattern: patternRx,
replacement: []byte(replacement),
maxBufferHandling: maxBufferBestEffort,
}
var (
delimiterString string
maxBuf interface{}
maxBufHandling interface{}
)
switch s.typ {
case delimited, delimitedRequest:
if len(args) < 3 || len(args) > 5 {
return nil, filters.ErrInvalidFilterParameters
}
if delimiterString, ok = args[2].(string); !ok {
return nil, filters.ErrInvalidFilterParameters
}
if len(args) >= 4 {
maxBuf = args[3]
}
if len(args) == 5 {
maxBufHandling = args[4]
}
f.delimiter = []byte(delimiterString)
default:
if len(args) > 4 {
return nil, filters.ErrInvalidFilterParameters
}
if len(args) >= 3 {
maxBuf = args[2]
}
if len(args) == 4 {
maxBufHandling = args[3]
}
}
if maxBuf != nil {
switch v := maxBuf.(type) {
case int:
f.maxEditorBuffer = v
case float64:
f.maxEditorBuffer = int(v)
default:
return nil, filters.ErrInvalidFilterParameters
}
}
if maxBufHandling != nil {
mbh, err := parseMaxBufferHandling(maxBufHandling)
if err != nil {
return nil, err
}
f.maxBufferHandling = mbh
}
return *f, nil
}
func (f filter) Request(ctx filters.FilterContext) {
switch f.typ {
case simple, delimited:
return
}
req := ctx.Request()
req.Header.Del("Content-Length")
req.ContentLength = -1
req.Body = newEditor(
req.Body,
f.pattern,
f.replacement,
f.delimiter,
f.maxEditorBuffer,
f.maxBufferHandling,
)
}
func (f filter) Response(ctx filters.FilterContext) {
switch f.typ {
case simpleRequest, delimitedRequest:
return
}
rsp := ctx.Response()
rsp.Header.Del("Content-Length")
rsp.ContentLength = -1
rsp.Body = newEditor(
rsp.Body,
f.pattern,
f.replacement,
f.delimiter,
f.maxEditorBuffer,
f.maxBufferHandling,
)
}