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112 lines
2.9 KiB
Go
112 lines
2.9 KiB
Go
package gzip
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import (
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"net/http"
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"path"
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"strings"
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"github.com/mholt/caddy/middleware"
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)
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// Filter determines if a request should be gzipped.
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type Filter interface {
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// ShouldCompress tells if gzip compression
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// should be done on the request.
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ShouldCompress(*http.Request) bool
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}
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// ExtFilter is Filter for file name extensions.
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type ExtFilter struct {
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// Exts is the file name extensions to accept
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Exts Set
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}
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// extWildCard is the wildcard for extensions.
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const extWildCard = "*"
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// ShouldCompress checks if the request file extension matches any
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// of the registered extensions. It returns true if the extension is
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// found and false otherwise.
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func (e ExtFilter) ShouldCompress(r *http.Request) bool {
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ext := path.Ext(r.URL.Path)
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return e.Exts.Contains(extWildCard) || e.Exts.Contains(ext)
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}
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// PathFilter is Filter for request path.
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type PathFilter struct {
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// IgnoredPaths is the paths to ignore
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IgnoredPaths Set
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}
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// ShouldCompress checks if the request path matches any of the
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// registered paths to ignore. It returns false if an ignored path
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// is found and true otherwise.
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func (p PathFilter) ShouldCompress(r *http.Request) bool {
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return !p.IgnoredPaths.ContainsFunc(func(value string) bool {
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return middleware.Path(r.URL.Path).Matches(value)
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})
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}
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// MIMEFilter is Filter for request content types.
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type MIMEFilter struct {
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// Types is the MIME types to accept.
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Types Set
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}
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// defaultMIMETypes is the list of default MIME types to use.
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var defaultMIMETypes = []string{
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"text/plain", "text/html", "text/css", "application/json", "application/javascript",
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"text/x-markdown", "text/xml", "application/xml",
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}
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// DefaultMIMEFilter creates a MIMEFilter with default types.
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func DefaultMIMEFilter() MIMEFilter {
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m := MIMEFilter{Types: make(Set)}
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for _, mime := range defaultMIMETypes {
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m.Types.Add(mime)
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}
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return m
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}
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// ShouldCompress checks if the content type of the request
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// matches any of the registered ones. It returns true if
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// found and false otherwise.
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func (m MIMEFilter) ShouldCompress(r *http.Request) bool {
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return m.Types.Contains(r.Header.Get("Content-Type"))
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}
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func ValidMIME(mime string) bool {
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s := strings.Split(mime, "/")
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return len(s) == 2 && strings.TrimSpace(s[0]) != "" && strings.TrimSpace(s[1]) != ""
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}
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// Set stores distinct strings.
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type Set map[string]struct{}
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// Add adds an element to the set.
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func (s Set) Add(value string) {
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s[value] = struct{}{}
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}
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// Remove removes an element from the set.
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func (s Set) Remove(value string) {
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delete(s, value)
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}
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// Contains check if the set contains value.
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func (s Set) Contains(value string) bool {
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_, ok := s[value]
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return ok
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}
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// ContainsFunc is similar to Contains. It iterates all the
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// elements in the set and passes each to f. It returns true
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// on the first call to f that returns true and false otherwise.
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func (s Set) ContainsFunc(f func(string) bool) bool {
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for k, _ := range s {
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if f(k) {
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return true
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}
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}
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return false
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}
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