├── assets ├── js │ └── app.js ├── axios │ └── axios.min.js └── vue │ └── vue.min.js ├── .gitignore ├── README.md ├── LICENSE ├── cache-control_test.go └── cache-control.go /assets/js/app.js: -------------------------------------------------------------------------------- 1 | function log(v) { 2 | console.log(JSON.stringify(v, null, 4)); 3 | } 4 | var app = new Vue({ 5 | el: '#app', 6 | }); 7 | var cval = 110; 8 | //# sourceMappingURL=app.js.map 9 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | cover.html 2 | dev-notes 3 | 4 | # Binaries for programs and plugins 5 | *.exe 6 | *.dll 7 | *.so 8 | *.dylib 9 | 10 | # Test binary, build with `go test -c` 11 | *.test 12 | 13 | # Output of the go coverage tool, specifically when used with LiteIDE 14 | *.out 15 | 16 | # Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736 17 | .glide/ 18 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # cache-control 2 | cache-control middleware adds _ETag_ header (md5 of the content) and _Cache-Control_ header 3 | 4 | ## sample usage 5 | 6 | Using chi router, we register this middleware before a `http.FileServer`: 7 | 8 | ```go 9 | fs := http.Dir(`./assets`) 10 | assetServer := http.FileServer(fs) 11 | rt.Route("/assets/*", func(rt chi.Router) { 12 | rt.Use(cachecontrol.CacheControl( 13 | fs, 14 | cachecontrol.StripPrefix("/assets"))) 15 | rt.Get( 16 | "/*", 17 | http.StripPrefix("/assets", assetServer).ServeHTTP) 18 | }) 19 | ``` 20 | 21 | # TODO 22 | 23 | * [dirwatch](https://github.com/dc0d/dirwatch) can be used for watching directories of assets (next). 24 | * more tests 25 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2017 Kaveh Shahbazian 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /cache-control_test.go: -------------------------------------------------------------------------------- 1 | package cachecontrol 2 | 3 | import ( 4 | "bytes" 5 | "io/ioutil" 6 | "net/http" 7 | "net/http/httptest" 8 | "testing" 9 | "time" 10 | 11 | "github.com/go-chi/chi" 12 | "github.com/stretchr/testify/assert" 13 | ) 14 | 15 | var fs = http.Dir(`./assets`) 16 | 17 | func createMux(options ...Option) *chi.Mux { 18 | rt := chi.NewRouter() 19 | rt.Route("/assets/*", func(rt chi.Router) { 20 | options = append(options, StripPrefix("/assets")) 21 | rt.Use(CacheControl(fs, options...)) 22 | rt.Get("/*", http.StripPrefix("/assets", http.FileServer(fs)).ServeHTTP) 23 | }) 24 | 25 | return rt 26 | } 27 | 28 | const goInternalETagHeader = "Etag" // it's case-insensitive; but why the change? 29 | 30 | // etags gets calculated on first call 31 | func TestETag1WarmUp(t *testing.T) { 32 | assert := assert.New(t) 33 | 34 | files := []string{ 35 | "/assets/js/app.js", 36 | "/assets/vue/vue.min.js", 37 | "/assets/axios/axios.min.js", 38 | "/assets/bulma/css/bulma.rtl.css", 39 | } 40 | 41 | mux := createMux() 42 | 43 | srv := httptest.NewServer(mux) 44 | defer srv.Close() 45 | 46 | for _, vf := range files { 47 | var u bytes.Buffer 48 | u.WriteString(string(srv.URL)) 49 | u.WriteString(vf) 50 | 51 | // 1 52 | res, err := http.Get(u.String()) 53 | assert.NoError(err) 54 | if res != nil { 55 | defer res.Body.Close() 56 | } 57 | } 58 | 59 | WAIT_FOR_ETAG: 60 | for _, vf := range files { 61 | _, ok := kv.Get(vf) 62 | if !ok { 63 | time.Sleep(time.Millisecond * 100) 64 | goto WAIT_FOR_ETAG 65 | } 66 | } 67 | } 68 | 69 | func TestETag1(t *testing.T) { 70 | assert := assert.New(t) 71 | 72 | files := []string{ 73 | "/assets/js/app.js", 74 | "/assets/vue/vue.min.js", 75 | "/assets/axios/axios.min.js", 76 | "/assets/bulma/css/bulma.rtl.css", 77 | } 78 | 79 | mux := createMux() 80 | 81 | srv := httptest.NewServer(mux) 82 | defer srv.Close() 83 | 84 | for _, vf := range files { 85 | var u bytes.Buffer 86 | u.WriteString(string(srv.URL)) 87 | u.WriteString(vf) 88 | 89 | // 1 90 | res, err := http.Get(u.String()) 91 | assert.NoError(err) 92 | if res != nil { 93 | defer res.Body.Close() 94 | } 95 | 96 | b, err := ioutil.ReadAll(res.Body) 97 | assert.NoError(err) 98 | assert.Equal("public, max-age=2419200", res.Header[cacheControlServer][0]) 99 | foundETag := res.Header[goInternalETagHeader][0] 100 | assert.Equal(http.StatusOK, res.StatusCode) 101 | 102 | // 2 103 | req, err := http.NewRequest("GET", u.String(), nil) 104 | assert.NoError(err) 105 | req.Header.Set(etagHeaderClient, foundETag) 106 | res, err = (&http.Client{}).Do(req) 107 | assert.NoError(err) 108 | if res != nil { 109 | defer res.Body.Close() 110 | } 111 | 112 | b, err = ioutil.ReadAll(res.Body) 113 | assert.NoError(err) 114 | assert.Equal("public, max-age=2419200", res.Header[cacheControlServer][0]) 115 | assert.Equal(foundETag, res.Header[goInternalETagHeader][0]) 116 | assert.True(len(b) == 0) 117 | assert.Equal(http.StatusNotModified, res.StatusCode) 118 | } 119 | } 120 | -------------------------------------------------------------------------------- /cache-control.go: -------------------------------------------------------------------------------- 1 | package cachecontrol 2 | 3 | import ( 4 | "crypto/md5" 5 | "fmt" 6 | "io" 7 | "log" 8 | "net/http" 9 | "strings" 10 | "time" 11 | 12 | "github.com/dc0d/tinykv" 13 | ) 14 | 15 | //----------------------------------------------------------------------------- 16 | 17 | const ( 18 | cacheControlServer = "Cache-Control" 19 | etagHeaderServer = "ETag" 20 | etagHeaderClient = "If-None-Match" 21 | 22 | calcPrefix = "CALC-" 23 | ) 24 | 25 | var ( 26 | kv = tinykv.New(time.Second * 30) 27 | devMode = false 28 | defaultETag = fmt.Sprintf("%d", time.Now().UTC().Unix()) 29 | defaultMaxAge = int((time.Hour * 24 * 28).Seconds()) 30 | ) 31 | 32 | // DevelopmentMode checks for expired entries every time.Millisecond * 10 33 | func DevelopmentMode() { 34 | kv = tinykv.New(time.Millisecond * 10) 35 | devMode = true 36 | } 37 | 38 | //----------------------------------------------------------------------------- 39 | // options 40 | 41 | type ccoptions struct { 42 | maxAge int 43 | isPrivate bool 44 | isWeak bool 45 | stripPrefix string 46 | fs http.FileSystem 47 | } 48 | 49 | // Option . 50 | type Option func(ccoptions) ccoptions 51 | 52 | // StripPrefix . 53 | func StripPrefix(stripPrefix string) Option { 54 | return func(cco ccoptions) ccoptions { 55 | cco.stripPrefix = stripPrefix 56 | return cco 57 | } 58 | } 59 | 60 | // MaxAge sets "max-age" in "Cache-Control" header, in seconds 61 | func MaxAge(maxAge int) Option { 62 | return func(cco ccoptions) ccoptions { 63 | cco.maxAge = maxAge 64 | return cco 65 | } 66 | } 67 | 68 | // IsPrivate marks "Cache-Control" as private 69 | func IsPrivate(isPrivate bool) Option { 70 | return func(cco ccoptions) ccoptions { 71 | cco.isPrivate = isPrivate 72 | return cco 73 | } 74 | } 75 | 76 | // IsWeak sets if the generated ETag should be a weak one 77 | func IsWeak(isWeak bool) Option { 78 | return func(cco ccoptions) ccoptions { 79 | cco.isWeak = isWeak 80 | return cco 81 | } 82 | } 83 | 84 | //----------------------------------------------------------------------------- 85 | 86 | func calculateETag(urlPath string, fs http.FileSystem, cco ccoptions) error { 87 | if fs == nil { 88 | return fmt.Errorf("no fs") 89 | } 90 | if len(urlPath) == 0 { 91 | return fmt.Errorf("no url") 92 | } 93 | // check if already calculating 94 | calcKey := calcPrefix + urlPath 95 | _, ok := kv.Get(calcKey) 96 | if ok { 97 | // already calculating 98 | return fmt.Errorf("already calculating") 99 | } 100 | if err := kv.Put(calcKey, struct{}{}, tinykv.CAS(func(old interface{}, found bool) bool { 101 | return !found 102 | })); err != nil { 103 | // already calculating 104 | return fmt.Errorf("already calculating") 105 | } 106 | defer kv.Delete(calcKey) 107 | // get file 108 | var f http.File 109 | var err error 110 | fp := strings.TrimPrefix(urlPath, cco.stripPrefix) 111 | if f, err = fs.Open(fp); err != nil { 112 | return fmt.Errorf("%v %v", err, fp) 113 | } 114 | 115 | // calculate etag 116 | chunk := make([]byte, 2048) 117 | n := 0 118 | hash := md5.New() 119 | for err == nil { 120 | n, err = f.Read(chunk) 121 | if err != nil { 122 | break 123 | } 124 | if n == 0 { 125 | continue 126 | } 127 | rb := chunk[:n] 128 | hash.Write(rb) 129 | } 130 | if err != nil && err != io.EOF { 131 | return err 132 | } 133 | 134 | // put inside kv 135 | var etagFormat = "\"%x\"" 136 | etag := fmt.Sprintf(etagFormat, hash.Sum(nil)) 137 | kv.Put(urlPath, etag, tinykv.CAS(func(v interface{}, found bool) bool { 138 | return !found 139 | }), 140 | tinykv.ExpiresAfter(time.Second*time.Duration(cco.maxAge))) 141 | 142 | return nil 143 | } 144 | 145 | //----------------------------------------------------------------------------- 146 | 147 | // CacheControl is a middleware for adding ETag and Cache-Control headers, 148 | // and checks If-None-Match client header 149 | func CacheControl(fs http.FileSystem, options ...Option) func(http.Handler) http.Handler { 150 | var cco ccoptions 151 | for _, opt := range options { 152 | cco = opt(cco) 153 | } 154 | 155 | if cco.maxAge <= 0 { 156 | cco.maxAge = defaultMaxAge 157 | } 158 | 159 | cco.fs = fs 160 | 161 | return func(next http.Handler) http.Handler { 162 | h := func(rw http.ResponseWriter, rq *http.Request) { 163 | etag, ok := kv.Get(rq.URL.Path) 164 | if !ok { 165 | // 1 166 | go func() { 167 | err := calculateETag(rq.URL.Path, fs, cco) 168 | if !devMode || err == nil { 169 | return 170 | } 171 | log.Println("err: ", err) 172 | }() 173 | // 2 174 | next.ServeHTTP(rw, rq) 175 | return 176 | } 177 | 178 | // add headers 179 | accessScope := "public" 180 | if cco.isPrivate { 181 | accessScope = "private" 182 | } 183 | if !devMode { 184 | rw.Header().Set(cacheControlServer, 185 | fmt.Sprintf(accessScope+", max-age=%d", cco.maxAge)) 186 | rw.Header().Set(etagHeaderServer, etag.(string)) 187 | } else { 188 | rw.Header().Set(cacheControlServer, 189 | fmt.Sprintf(accessScope+", max-age=%d", 1)) 190 | rw.Header().Set(etagHeaderServer, fmt.Sprintf("%v", time.Now().UnixNano())) 191 | } 192 | 193 | // if client sent If-None-Match then just answer with http.StatusNotModified/304 194 | // and do not send actual content 195 | if found, ok := rq.Header[etagHeaderClient]; ok && found[0] == etag { 196 | rw.WriteHeader(http.StatusNotModified) 197 | return 198 | } 199 | 200 | next.ServeHTTP(rw, rq) 201 | } 202 | return http.HandlerFunc(h) 203 | } 204 | } 205 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