use suffix to PDF-ify any ol' endpoint

PDFify.go

package main

import (
	"fmt"
	"log"
	"net/http"

	"github.com/gorilla/context"
	"github.com/gorilla/mux"
	"github.com/terryh/gopdf"
)

func main() {
	r := mux.NewRouter()

	// TODO: use valid path characters regex: /^([!#$&-;=?-[]_a-z~]|%[0-9a-fA-F]{2})+$/
	r.HandleFunc("/{inner_url:[0-9/A-Za-z._]+}/to_pdf", PDFHandle).Methods("GET")

	r.HandleFunc("/serve/me/plz", SomeHandler).Methods("GET")

	http.Handle("/", r)

	log.Println("listening on 0.0.0.0:8080")
	err := http.ListenAndServe(":8080", context.ClearHandler(http.DefaultServeMux))
	log.Println(err)
}

func SomeHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "<div> ¡Hi Mom! </div>")
}

func PDFHandle(w http.ResponseWriter, r *http.Request) {
	// get URL string before "/to_pdf"
	u := r.URL.String()
	u = u[:len(u)-(len("/to_pdf"))]
	p := "http://" + r.Host + u

	log.Println("going to PDF-ify: ", p)

	result, err := gopdf.Url2pdf(p)
	log.Println(err)
	w.Header().Set("Content-Type", "application/pdf")
	w.Write(result)
}