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server.go
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server.go
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package main
import (
"fmt"
"github.com/httpreserve/httpreserve"
"github.com/justinas/alice"
"html/template"
"log"
"net/http"
"net/url"
"sync"
"time"
)
const layout = "2006-01-02"
// 404 response handler for all non supported function
func notFound(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.WriteHeader(http.StatusNotFound)
fmt.Fprintln(w, "Sorry, this is not a supported function for this application.")
}
func timegateHandler(w http.ResponseWriter, r *http.Request) {
query, err := url.ParseQuery(r.URL.RawQuery)
if err != nil {
log.Println(err)
}
// birth of the web...
date := "19910806000000"
uri := "http://info.cern.ch/"
if val, ok := query["date"]; ok {
date = val[0]
t, err := time.Parse(layout, date)
if err != nil {
log.Println(err, "setting date to default")
} else {
date = t.Format(datelayout)
log.Println("date:", date)
}
}
if val, ok := query["url"]; ok {
uri = val[0]
log.Println("requested:", uri)
}
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
response := timegate(uri, date)
fmt.Fprintln(w, response)
memes = memes[:0] // clear memento list
return
}
// Handle response when a page is requested by the browser
func indexhandler(w http.ResponseWriter, r *http.Request) {
//404...
if r.URL.String() != "/" {
notFound(w, r)
return
}
//Otherwise...
switch r.Method {
case http.MethodOptions:
notFound(w, r)
return
case http.MethodHead:
fallthrough
case http.MethodPost:
fallthrough
case http.MethodGet:
//deliver a default HTML to the web-browser
w.Header().Set("Content-Type", "text/html")
t, _ := template.ParseFiles("static/index.htm")
t.Execute(w, nil)
return
default:
notFound(w, r)
return
}
}
// Logger middleware to return information to stderr we're
// interested in...
func logger(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log.Printf("%s requested %s, method %s", r.RemoteAddr, r.URL, r.Method)
h.ServeHTTP(w, r)
})
}
// Part of our Handler Adapter methods
// TODO: learn more about to document further
type headerSetter struct {
key, val string
handler http.Handler
}
// Part of middleware layer to create default header responses
func (hs headerSetter) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Header().Set(hs.key, hs.val)
hs.handler.ServeHTTP(w, r)
}
// Set default headers for any single response from httpreserve
func newHeaderSetter(key, val string) func(http.Handler) http.Handler {
return func(h http.Handler) http.Handler {
return headerSetter{key, val, h}
}
}
// Configure our default server mechanism for httpreserve
func configureDefault() http.Handler {
fs := http.FileServer(http.Dir("static"))
h := http.NewServeMux()
//Routes and handlers...
h.HandleFunc("/", indexhandler)
h.HandleFunc("/timegate", timegateHandler)
h.Handle("/static/", http.StripPrefix("/static/", fs))
// Middleware chain to handle various generic HTTP functions
// TODO: Learn what other middleware we may need...
middlewareChain := alice.New(
newHeaderSetter("Server", httpreserve.VersionText()), // USERAGENT IN MAIN PACKAGE
logger,
).Then(h)
return middlewareChain
}
// References contributing to this code...
// https://cryptic.io/go-http/
// https://github.com/justinas/alice
// DefaultServer is our call to standup a default server
// for the httpreserve resolver service to be queried by our other apps.
func DefaultServer(port string, wg *sync.WaitGroup) error {
middleWare := configureDefault()
err := http.ListenAndServe(":"+port, middleWare)
if err != nil {
wg.Done()
return err
}
wg.Done()
return nil
}