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options.go
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options.go
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package gzip
import (
"compress/gzip"
"net/http"
"regexp"
"strings"
"github.com/gin-gonic/gin"
)
// nolint:gochecknoglobals // It's okay that these are globals.
var (
// DefaultExcludedExtentions is a list of file extensions to exlude from compression by default.
DefaultExcludedExtentions = NewExcludedExtensions([]string{
".png", ".gif", ".jpeg", ".jpg",
})
// DefaultOptions represents the options used to configure this middleware.
DefaultOptions = &Options{
ExcludedExtensions: DefaultExcludedExtentions,
}
)
type Options struct {
ExcludedExtensions ExcludedExtensions
ExcludedPaths ExcludedPaths
ExcludedPathesRegexs ExcludedPathesRegexs
DecompressFn func(c *gin.Context)
MinLength int
}
type Option func(*Options)
func WithExcludedExtensions(args []string) Option {
return func(o *Options) {
o.ExcludedExtensions = NewExcludedExtensions(args)
}
}
func WithExcludedPaths(args []string) Option {
return func(o *Options) {
o.ExcludedPaths = NewExcludedPaths(args)
}
}
func WithExcludedPathsRegexs(args []string) Option {
return func(o *Options) {
o.ExcludedPathesRegexs = NewExcludedPathesRegexs(args)
}
}
func WithDecompressFn(decompressFn func(c *gin.Context)) Option {
return func(o *Options) {
o.DecompressFn = decompressFn
}
}
func WithMinLength(minLength int) Option {
return func(o *Options) {
o.MinLength = minLength
}
}
// ExcludedExtensions is a map of file extensions to exclude from compression.
type ExcludedExtensions map[string]bool
func NewExcludedExtensions(extensions []string) ExcludedExtensions {
res := make(ExcludedExtensions)
for _, e := range extensions {
res[e] = true
}
return res
}
func (e ExcludedExtensions) Contains(target string) bool {
_, ok := e[target]
return ok
}
// ExcludedPaths is a list of paths to exclude from compression.
type ExcludedPaths []string
func NewExcludedPaths(paths []string) ExcludedPaths {
return ExcludedPaths(paths)
}
func (e ExcludedPaths) Contains(requestURI string) bool {
for _, path := range e {
if strings.HasPrefix(requestURI, path) {
return true
}
}
return false
}
// ExcludedPathesRegexs is a list of regular expressions which match paths to exclude from compression.
type ExcludedPathesRegexs []*regexp.Regexp
func NewExcludedPathesRegexs(regexs []string) ExcludedPathesRegexs {
result := make([]*regexp.Regexp, len(regexs))
for i, reg := range regexs {
result[i] = regexp.MustCompile(reg)
}
return result
}
func (e ExcludedPathesRegexs) Contains(requestURI string) bool {
for _, reg := range e {
if reg.MatchString(requestURI) {
return true
}
}
return false
}
func DefaultDecompressHandle(c *gin.Context) {
if c.Request.Body == nil {
return
}
r, err := gzip.NewReader(c.Request.Body)
if err != nil {
_ = c.AbortWithError(http.StatusBadRequest, err)
return
}
c.Request.Header.Del("Content-Encoding")
c.Request.Header.Del("Content-Length")
c.Request.Body = r
}