func (m *HTTPModifier) Rewrite(payload []byte) (response []byte) {
if len(m.config.methods) > 0 {
method := proto.Method(payload)
matched := false
for _, m := range m.config.methods {
if bytes.Equal(method, m) {
matched = true
break
}
}
if !matched {
return
}
}
if len(m.config.headers) > 0 {
for _, header := range m.config.headers {
payload = proto.SetHeader(payload, []byte(header.Name), []byte(header.Value))
}
}
if len(m.config.params) > 0 {
for _, param := range m.config.params {
payload = proto.SetPathParam(payload, param.Name, param.Value)
}
}
if len(m.config.urlRegexp) > 0 {
path := proto.Path(payload)
matched := false
for _, f := range m.config.urlRegexp {
if f.regexp.Match(path) {
matched = true
break
}
}
if !matched {
return
}
}
if len(m.config.urlNegativeRegexp) > 0 {
path := proto.Path(payload)
for _, f := range m.config.urlNegativeRegexp {
if f.regexp.Match(path) {
return
}
}
}
if len(m.config.headerFilters) > 0 {
for _, f := range m.config.headerFilters {
value := proto.Header(payload, f.name)
if len(value) > 0 && !f.regexp.Match(value) {
return
}
}
}
if len(m.config.headerNegativeFilters) > 0 {
for _, f := range m.config.headerNegativeFilters {
value := proto.Header(payload, f.name)
if len(value) > 0 && f.regexp.Match(value) {
return
}
}
}
if len(m.config.headerHashFilters) > 0 {
for _, f := range m.config.headerHashFilters {
value := proto.Header(payload, f.name)
if len(value) > 0 {
hasher := fnv.New32a()
hasher.Write(value)
if (hasher.Sum32() % 100) >= f.percent {
return
}
}
}
}
if len(m.config.paramHashFilters) > 0 {
for _, f := range m.config.paramHashFilters {
value, s, _ := proto.PathParam(payload, f.name)
if s != -1 {
hasher := fnv.New32a()
hasher.Write(value)
if (hasher.Sum32() % 100) >= f.percent {
return
}
}
}
}
if len(m.config.urlRewrite) > 0 {
path := proto.Path(payload)
for _, f := range m.config.urlRewrite {
if f.src.Match(path) {
path = f.src.ReplaceAll(path, f.target)
payload = proto.SetPath(payload, path)
break
}
}
}
return payload
}
func (m *HTTPModifier) Rewrite(payload []byte) (response []byte) {
if len(m.config.methods) > 0 && !m.config.methods.Contains(proto.Method(payload)) {
return
}
if m.config.urlRegexp.regexp != nil {
host, _, _, _ := proto.Header(payload, []byte("Host"))
fullPath := append(host, proto.Path(payload)...)
if !m.config.urlRegexp.regexp.Match(fullPath) {
return
}
}
if len(m.config.headerFilters) > 0 {
for _, f := range m.config.headerFilters {
value, s, _, _ := proto.Header(payload, f.name)
if s != -1 && !f.regexp.Match(value) {
return
}
}
}
if len(m.config.headerHashFilters) > 0 {
for _, f := range m.config.headerHashFilters {
value, s, _, _ := proto.Header(payload, f.name)
if s == -1 {
return
}
hasher := fnv.New32a()
hasher.Write(value)
if (hasher.Sum32() % 100) >= f.percent {
return
}
}
}
if len(m.config.urlRewrite) > 0 {
path := proto.Path(payload)
for _, f := range m.config.urlRewrite {
if f.src.Match(path) {
path = f.src.ReplaceAll(path, f.target)
payload = proto.SetPath(payload, path)
break
}
}
}
if len(m.config.headers) > 0 {
for _, header := range m.config.headers {
payload = proto.SetHeader(payload, []byte(header.Name), []byte(header.Value))
}
}
return payload
}