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main.go
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// main.go
// A web service serving random numbers and strings.
package main
import (
"fmt"
"log"
"net/http"
"strconv"
"github.com/gorilla/mux"
"github.com/taflaj/util/random"
)
func init() {
log.SetFlags(log.Flags() | log.Lmicroseconds) // I like this particular log format
}
func logIt(r *http.Request) {
log.Printf("%v %v from %v", r.Method, r.URL.Path, r.RemoteAddr)
}
func helpHandler(w http.ResponseWriter, r *http.Request) {
logIt(r)
const page = `
<!DOCTYPE html>
<title>%v</title>
<h1>%v</h1>
<p><b>Usage:</b> %v/get/<i>type</i>/[<i>length</i>]</p>
<div>Types:</div>
<ul>
<li>number: numerical characters</li>
<li>hex: hexadecimal integer</li>
<li>alpha: alphabetical characters</li>
<li>alphanum: alphabetical and numerical characters</li>
<li>special: any 7-bit printable characters</li>
<li>any: any 8-bit characters URL-safe base64-encoded</li>
</ul>
<div>Default length is 32</div>
`
const title = "Random Number and String Generator"
w.Header().Set("Content-Type", "text/html; charset=utf-8")
fmt.Fprintf(w, page, title, title, r.Host)
}
func getHandler(w http.ResponseWriter, r *http.Request) {
logIt(r)
w.Header().Set("Content-Type", "text/plain")
vars := mux.Vars(r)
length := 32
l := vars["length"]
var err error
if len(l) > 0 {
length, err = strconv.Atoi(l)
if err != nil {
log.Printf("Error converting %v to int: %#v\n", l, err)
}
}
var result string
t := vars["type"]
switch t {
case "alpha":
result, err = random.Alpha(length)
case "alphanum":
result, err = random.AlphaNum(length)
case "any":
result, err = random.Any(length)
case "hex":
result, err = random.Hex(length)
case "number":
result, err = random.Number(length)
case "special":
result, err = random.Special(length)
}
if err != nil {
log.Printf("Error obtaining random %v: %#v\n", t, err)
}
fmt.Fprintf(w, result)
}
func main() {
r := mux.NewRouter()
r.HandleFunc("/", helpHandler)
r.HandleFunc("/get/{type}/", getHandler)
r.HandleFunc("/get/{type}/{length:[0-9]+}", getHandler)
log.Fatal(http.ListenAndServe(":8001", r))
}