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package main
import (
"context"
"crypto/sha256"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"strings"
"time"
"github.com/gorilla/mux"
)
// Attaches a request's IP address to the request's context
func newCtxUserIP(ctx context.Context, r *http.Request) context.Context {
base := strings.Split(r.RemoteAddr, ":")
uip := base[0]
return context.WithValue(ctx, ctxKey, uip)
}
// Retrieves a request's IP address from the request's context
func getIPFromCtx(ctx context.Context) string {
uip, ok := ctx.Value(ctxKey).(string)
if !ok {
log.Printf("Couldn't retrieve IP from request\n")
}
return uip
}
// Shim function to modify/pass context value to a handler
func ipMiddleware(hop http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := newCtxUserIP(r.Context(), r)
hop.ServeHTTP(w, r.WithContext(ctx))
})
}
// handles "/"
func indexHandler(w http.ResponseWriter, r *http.Request) {
uip := getIPFromCtx(r.Context())
log.Printf("Request from %v :: %v %v\n", uip, r.Method, r.URL)
// Stat the index template to get the mod time
var etag string
if indextmpl, err := os.Stat("assets/tmpl/index.html"); err != nil {
log.Printf("Couldn't stat index template for ETag ... %v\n", err)
} else {
etag = fmt.Sprintf("%x", sha256.Sum256([]byte(indextmpl.ModTime().String())))
}
// Take the hex-encoded sha256 sum of the index template's mod time
// to send as an ETag. If an error occured when grabbing the file info,
// the ETag will be empty.
w.Header().Set("ETag", "\""+etag+"\"")
w.Header().Set("Content-Type", htmlutf8)
// Pass the confObj.Instance data to the template,
// then send it to the client.
err := tmpls.ExecuteTemplate(w, "index.html", confObj.Instance)
if err != nil {
log.Printf("500: Error writing to HTTP stream: %v, %v %v via %v\n", err, r.Method, r.URL, uip)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
}
// handles "/api"
func apiBaseHandler(w http.ResponseWriter, r *http.Request) {
uip := getIPFromCtx(r.Context())
log.Printf("Request from %v :: %v %v\n", uip, r.Method, r.URL)
timerfc3339, err := time.Now().MarshalText()
if err != nil {
log.Printf("Couldn't format time as RFC3339: %v\n", err)
}
etag := fmt.Sprintf("%x", sha256.Sum256(timerfc3339))
w.Header().Set("ETag", etag)
w.Header().Set("Content-Type", txtutf8)
pathdata := []byte("\n\n" + r.URL.Path)
timerfc3339 = append(timerfc3339, pathdata...)
n, err := w.Write(timerfc3339)
if err != nil || n == 0 {
log.Printf("500: Error writing to HTTP stream: %v, %v %v via %v\n", err, r.Method, r.URL, uip)
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
// handles "/api/plain"
// maybe add json/xml support later
func apiFormatHandler(w http.ResponseWriter, r *http.Request) {
uip := getIPFromCtx(r.Context())
log.Printf("Request from %v :: %v %v\n", uip, r.Method, r.URL)
vars := mux.Vars(r)
format := vars["format"]
w.Header().Set("Content-Type", txtutf8)
n, err := w.Write([]byte(format + "\n"))
if err != nil || n == 0 {
log.Printf("500: Error writing to HTTP stream: %v, %v %v via %v\n", err, r.Method, r.URL, uip)
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
// handles "/api/plain/(users|mentions|tweets)"
func apiEndpointHandler(w http.ResponseWriter, r *http.Request) {
uip := getIPFromCtx(r.Context())
log.Printf("Request from %v :: %v %v\n", uip, r.Method, r.URL)
if r.FormValue("q") != "" || r.FormValue("url") != "" {
apiEndpointQuery(w, r)
return
}
w.Header().Set("Content-Type", htmlutf8)
n, err := w.Write([]byte(r.URL.String()))
if err != nil || n == 0 {
log.Printf("500: Error writing to HTTP stream: %v, %v %v via %v\n", err, r.Method, r.URL, uip)
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
// handles POST for "/api/plain/users"
func apiEndpointPOSTHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
format := vars["format"]
endpoint := vars["endpoint"]
uip := getIPFromCtx(r.Context())
log.Printf("Request from %v :: %v %v\n", uip, r.Method, r.URL)
w.Header().Set("Content-Type", htmlutf8)
n, err := w.Write([]byte(format + "/" + endpoint))
if err != nil || n == 0 {
log.Printf("500: Error writing to HTTP stream: %v, %v %v via %v\n", err, r.Method, r.URL, uip)
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
// handles "/api/plain/tags"
func apiTagsBaseHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
format := vars["format"]
uip := getIPFromCtx(r.Context())
log.Printf("Request from %v :: %v %v\n", uip, r.Method, r.URL)
w.Header().Set("Content-Type", htmlutf8)
n, err := w.Write([]byte("api/" + format + "/tags"))
if err != nil || n == 0 {
log.Printf("500: Error writing to HTTP stream: %v, %v %v via %v\n", err, r.Method, r.URL, uip)
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
// handles "/api/plain/tags/[a-zA-Z0-9]+"
func apiTagsHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
format := vars["format"]
tags := vars["tags"]
uip := getIPFromCtx(r.Context())
log.Printf("Request from %v :: %v %v\n", uip, r.Method, r.URL)
w.Header().Set("Content-Type", htmlutf8)
n, err := w.Write([]byte("api/" + format + "/tags/" + tags))
if err != nil || n == 0 {
log.Printf("500: Error writing to HTTP stream: %v, %v %v via %v\n", err, r.Method, r.URL, uip)
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
// Serving the stylesheet virtually because
// files aren't served directly.
func cssHandler(w http.ResponseWriter, r *http.Request) {
uip := getIPFromCtx(r.Context())
log.Printf("Request from %v :: %v %v\n", uip, r.Method, r.URL)
// read the raw bytes of the stylesheet
css, err := ioutil.ReadFile("assets/style.css")
if err != nil {
if os.IsNotExist(err) {
log.Printf("CSS file does not exist: /css request 404\n")
http.Error(w, err.Error(), http.StatusNotFound)
return
}
log.Printf("500: %v\n", err)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
// Get the mod time for the etag header
stat, err := os.Stat("assets/style.css")
if err != nil {
log.Printf("Couldn't stat CSS file to send ETag header: %v\n", err)
}
// Sending the sha256 sum of the modtime in hexadecimal for the ETag header
etag := fmt.Sprintf("%x", sha256.Sum256([]byte(stat.ModTime().String())))
w.Header().Set("ETag", "\""+etag+"\"")
w.Header().Set("Content-Type", cssutf8)
n, err := w.Write(css)
if err != nil || n == 0 {
log.Printf("500: Error writing to HTTP stream: %v, %v %v via %v\n", err, r.Method, r.URL, uip)
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
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