/
web.go
209 lines (184 loc) · 4.77 KB
/
web.go
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package main
import (
"encoding/json"
"encoding/xml"
"fmt"
"html/template"
"net"
"net/http"
"strings"
"time"
humanize "github.com/dustin/go-humanize"
"github.com/julienschmidt/httprouter"
)
var (
funcMap = template.FuncMap{
"sub": func(a, b int64) int64 {
return a - b
},
"add": func(a, b int64) int64 {
return a + b
},
"nums": func(max int) (nums []int) {
for i := 0; i < max; i++ {
nums = append(nums, i)
}
return nums
},
"mediaexists": func(id string) bool {
_, err := FindMedia(id)
return err == nil
},
"safe": func(s string) template.HTML {
return template.HTML(s)
},
"bytes": func(n int64) string {
return humanize.Bytes(uint64(n))
},
"time": humanize.Time,
"duration": func(seconds int64) string {
hours := seconds / 3600
seconds -= hours * 3600
minutes := seconds / 60
seconds -= minutes * 60
if hours > 0 {
return fmt.Sprintf("%d:%02d:%02d", hours, minutes, seconds)
}
return fmt.Sprintf("%d:%02d", minutes, seconds)
},
}
errorPageHTML = `
<html>
<head>
<title>Error</title>
</head>
<body>
<h2 style="color: orangered;">An error has occurred. <a href="/soundscape/logs">Check the logs</a></h2>
</body>
</html>
`
)
func Redirect(w http.ResponseWriter, r *http.Request, format string, a ...interface{}) {
location := httpPrefix
location += fmt.Sprintf(format, a...)
http.Redirect(w, r, location, http.StatusFound)
}
func Error(w http.ResponseWriter, err error) {
logger.Error(err)
w.WriteHeader(http.StatusInternalServerError)
w.Header().Set("Content-Type", "text/html; charset=utf-8")
fmt.Fprintf(w, errorPageHTML)
}
func Prefix(path string) string {
return httpPrefix + path
}
func Log(h httprouter.Handle) httprouter.Handle {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
// Request info
addr := r.RemoteAddr
xff := r.Header.Get("X-Forwarded-For")
realip := r.Header.Get("X-Real-IP")
method := r.Method
rang := r.Header.Get("Range")
path := r.RequestURI
// Run the handler
start := time.Now()
h(w, r, ps)
elapsed := int64(time.Since(start) / time.Millisecond)
// Response info
mime := w.Header().Get("Content-Type")
logger.Infof("%q %q %q %q %q %q %q %d ms", addr, xff, realip, method, path, rang, mime, elapsed)
}
}
func Auth(h httprouter.Handle, optional bool) httprouter.Handle {
return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
user := ""
// Method: Basic Auth (if we're not behind a reverse proxy, use basic auth)
if authsecret != nil {
user, password, _ := r.BasicAuth()
if user == httpUsername && password == authsecret.Get() {
ps = append(ps, httprouter.Param{Key: "user", Value: user})
h(w, r, ps)
return
}
if optional {
h(w, r, ps)
return
}
w.Header().Set("WWW-Authenticate", `Basic realm="Sign-in Required"`)
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
// Method: Reverse Proxy (if we're behind a reverse proxy, trust it.)
clientIP, _, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
http.NotFound(w, r)
return
}
if clientIP == reverseProxyAuthIP {
user = r.Header.Get(reverseProxyAuthHeader)
}
if user == "" && !optional {
logger.Errorf("auth failed: client %q", clientIP)
if backlink != "" {
http.Redirect(w, r, backlink, http.StatusFound)
return
}
http.NotFound(w, r)
return
}
// Add "user" to params.
if user != "" {
ps = append(ps, httprouter.Param{Key: "user", Value: user})
}
h(w, r, ps)
}
}
func XML(w http.ResponseWriter, data interface{}) {
w.Header().Set("Content-Type", "text/xml")
fmt.Fprintf(w, xml.Header)
enc := xml.NewEncoder(w)
enc.Indent("", " ")
if err := enc.Encode(data); err != nil {
logger.Error(err)
}
fmt.Fprintf(w, "\n")
}
func JSON(w http.ResponseWriter, data interface{}) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
enc := json.NewEncoder(w)
enc.SetIndent("", " ")
if err := enc.Encode(data); err != nil {
logger.Error(err)
}
}
func HTML(w http.ResponseWriter, target string, data interface{}) {
t := template.New(target)
t.Funcs(funcMap)
for _, filename := range AssetNames() {
if !strings.HasPrefix(filename, "templates/") {
continue
}
name := strings.TrimPrefix(filename, "templates/")
b, err := Asset(filename)
if err != nil {
Error(w, err)
return
}
var tmpl *template.Template
if name == t.Name() {
tmpl = t
} else {
tmpl = t.New(name)
}
if _, err := tmpl.Parse(string(b)); err != nil {
Error(w, err)
return
}
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
if err := t.Execute(w, data); err != nil {
Error(w, err)
return
}
}