summary refs log blame commit diff stats
path: root/svc/http.go
blob: 347430e003987221b02c81348084d8d7011ee00c (plain) (tree)
1
2
3
4
5
6
7
8
9
10
                                                      

        
                 
             
             
                  
                 

 









                                                          

                                                            
                                                                  
                                                                         
 

                                                
 





                                                                  


                                                       



                                                                  
                                                  

 
                                                              
                                               
 


                                                                 
         
 
                               
 
 

                                                          
 



                                                                              
 
 
                              
                                           
 
                                        
                                                                                     
 
 
                                                                 
                                        
                                                                               
                                                                     

 
                                                                
                                           
 
                                        
                                                                                                        
                                                       

 
                                                                
                                           
 
                                        
                                                                                                        
                                                                  
 
package svc // import "github.com/getwtxt/getwtxt/svc"

import (
	"context"
	"log"
	"net"
	"net/http"
	"strings"
)

// content-type consts
const txtutf8 = "text/plain; charset=utf-8"
const htmlutf8 = "text/html; charset=utf-8"
const cssutf8 = "text/css; charset=utf-8"

// ipCtxKey is the Context value key for user IP addresses
type ipCtxKey int

const ctxKey ipCtxKey = iota

// Attaches a request's IP address to the request's context.
// If getwtxt is behind a reverse proxy, get the last entry
// in the X-Forwarded-For or X-Real-IP HTTP header as the user IP.
func newCtxUserIP(ctx context.Context, r *http.Request) context.Context {

	base := strings.Split(r.RemoteAddr, ":")
	uip := base[0]

	if _, ok := r.Header["X-Forwarded-For"]; ok {
		proxied := r.Header["X-Forwarded-For"]
		base = strings.Split(proxied[len(proxied)-1], ":")
		uip = base[0]
	}

	xRealIP := http.CanonicalHeaderKey("X-Real-IP")
	if _, ok := r.Header[xRealIP]; ok {
		proxied := r.Header[xRealIP]
		base = strings.Split(proxied[len(proxied)-1], ":")
		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) net.IP {

	uip, ok := ctx.Value(ctxKey).(string)
	if !ok {
		log.Printf("Couldn't retrieve IP from request\n")
	}

	return net.ParseIP(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))
	})
}

func log200(r *http.Request) {
	useragent := r.Header["User-Agent"]

	uip := getIPFromCtx(r.Context())
	log.Printf("*** %v :: 200 :: %v %v :: %v\n", uip, r.Method, r.URL, useragent)
}

func log400(w http.ResponseWriter, r *http.Request, err string) {
	uip := getIPFromCtx(r.Context())
	log.Printf("*** %v :: 400 :: %v %v :: %v\n", uip, r.Method, r.URL, err)
	http.Error(w, "400 Bad Request: "+err, http.StatusBadRequest)
}

func log404(w http.ResponseWriter, r *http.Request, err error) {
	useragent := r.Header["User-Agent"]

	uip := getIPFromCtx(r.Context())
	log.Printf("*** %v :: 404 :: %v %v :: %v :: %v\n", uip, r.Method, r.URL, useragent, err.Error())
	http.Error(w, err.Error(), http.StatusNotFound)
}

func log500(w http.ResponseWriter, r *http.Request, err error) {
	useragent := r.Header["User-Agent"]

	uip := getIPFromCtx(r.Context())
	log.Printf("*** %v :: 500 :: %v %v :: %v :: %v\n", uip, r.Method, r.URL, useragent, err.Error())
	http.Error(w, err.Error(), http.StatusInternalServerError)
}