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utils.go
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utils.go
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package surf
import (
"compress/flate"
"compress/gzip"
"fmt"
"io"
"net/http"
"net/url"
"reflect"
"strconv"
"github.com/dsnet/compress/brotli"
)
func readBody(res *http.Response, maxBodyLength int) ([]byte, error) {
defer res.Body.Close()
var reader io.Reader = res.Body
// Check for Content-Encoding and decode accordingly
// https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Headers/Content-Encoding
encoding := res.Header.Get(headerContentEncoding)
// If no content, but headers still say that it is encoded,
if res.StatusCode != http.StatusNoContent || res.Request.Method != http.MethodHead {
var err error
switch encoding {
case "gzip", "x-gzip", "compress", "x-compress":
reader, err = gzip.NewReader(res.Body)
if err != nil {
return nil, fmt.Errorf("failed to create Gzip reader: %w", err)
}
defer reader.(*gzip.Reader).Close()
case "br":
reader, err = brotli.NewReader(res.Body, nil)
if err != nil {
return nil, fmt.Errorf("failed to create Brotli reader: %w", err)
}
defer reader.(*brotli.Reader).Close()
case "deflate":
reader = flate.NewReader(res.Body)
defer reader.(io.ReadCloser).Close()
}
}
size := 0
contentLength := res.Header.Get(headerContentLength)
if contentLength != "" {
size, _ = strconv.Atoi(contentLength)
}
if maxBodyLength > 0 && size > maxBodyLength {
return nil, fmt.Errorf("response body exceeds the maximum length of %d", maxBodyLength)
}
data, err := readAllInitCap(reader, size)
if err != nil {
return nil, fmt.Errorf("failed to read response body: %w", err)
}
return data, nil
}
func readAllInitCap(r io.Reader, initCap int) ([]byte, error) {
if initCap <= 0 {
initCap = 512
}
b := make([]byte, 0, initCap)
for {
if len(b) == cap(b) {
b = append(b, 0)[:len(b)]
}
n, err := r.Read(b[len(b):cap(b)])
b = b[:len(b)+n]
if err == io.EOF {
err = nil
break
} else if err != nil {
return nil, fmt.Errorf("failed to read response body: %w", err)
}
}
return b, nil
}
func cloneMap[V any](originalMap map[string]V) map[string]V {
clonedMap := make(map[string]V)
for key, value := range originalMap {
clonedMap[key] = value
}
return clonedMap
}
func cloneURLValues(originalValues url.Values) url.Values {
clonedValues := make(url.Values)
for key, values := range originalValues {
clonedValues[key] = append([]string(nil), values...)
}
return clonedValues
}
func isZero(value interface{}) bool {
if value == nil {
return true
}
v := reflect.ValueOf(value)
return reflect.DeepEqual(v.Interface(), reflect.Zero(v.Type()).Interface())
}
func defaultValue[T any](value, defaultValue T) T {
if isZero(value) {
return defaultValue
}
return value
}