handlers.go

// handlers.go defines functions that receive http requests and write
// http responses.
package main

import (
	"fmt"
	"net/http"
)

// getHandler handles requests to retrive existing pastes.
func getHandler(response http.ResponseWriter, request *http.Request) {
	key := request.URL.Path[len(pasteRoot)-1:]
	page, keyErr := getPageForKey(key)
	if keyErr != nil {
		ERROR.Println(keyErr)
		http.NotFound(response, request)
	} else {
		_, printErr := fmt.Fprint(response, page)
		if printErr != nil {
			ERROR.Println(printErr)
		}
	}
}

// putHandler handles requests made to the root path. It the request
// is a GET then we return a page containing a form. If it is a POST
// then we save the new paste.
func putHandler(response http.ResponseWriter, request *http.Request) {
	switch request.Method {
	case "GET":
		newPastePage := getNewPastePage()
		_, printErr := fmt.Fprint(response, newPastePage)
		if printErr != nil {
			ERROR.Println(printErr)
		}
	case "POST":
		parseErr := request.ParseForm()
		if parseErr != nil {
			internalServerError(response, parseErr)
		} else {
			text := request.FormValue("paste")
			newKey, saveErr := savePaste(text)
			if saveErr != nil {
				internalServerError(response, saveErr)
			} else {
				http.Redirect(
					response, request,
					pasteRoot+newKey, http.StatusFound)
			}
		}
	default:
		http.Error(
			response, "Error: Method Not Allowed (405)",
			http.StatusMethodNotAllowed)
	}
}