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indent.go
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indent.go
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package main
import (
"appengine"
"appengine/urlfetch"
"bytes"
"encoding/json"
"errors"
"fmt"
"html/template"
"io/ioutil"
"net/http"
"regexp"
)
const (
EXAMPLE_URL = "https://www.googleapis.com/plus/v1/people/+DeWittClinton"
API_KEY = "AIzaSyDyMJWU-cElvX5NESC8zdQ3XoURbkT4DOc" // rate limited per user in console
USAGE_TEMPLATE = "templates/usage.tmpl"
COLOR_TEMPLATE = "templates/color.tmpl"
)
var (
UNSAFE_JSON_CHARS, _ = regexp.Compile("[^\\w\\d\\-\\_]")
)
func init() {
http.HandleFunc("/", usage)
http.HandleFunc("/indent", indent)
}
func usage(w http.ResponseWriter, r *http.Request) {
t, err := template.ParseFiles(USAGE_TEMPLATE)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
} else {
data := map[string]interface{}{"Url": template.URL(EXAMPLE_URL)}
t.Execute(w, data)
}
}
func santizeCallback(s string) string {
if UNSAFE_JSON_CHARS.Match([]byte(s)) {
return ""
}
return s
}
func content(w http.ResponseWriter, r *http.Request) (string, error, int) {
content := r.FormValue("content")
if content != "" {
return content, nil, http.StatusOK
}
url := r.FormValue("url")
if url == "" {
return "", errors.New("Either a 'content' or 'url' parameter is required."), http.StatusBadRequest
}
c := appengine.NewContext(r)
client := urlfetch.Client(c)
if url == EXAMPLE_URL {
url = fmt.Sprintf("%s?key=%s&userIp=%s", url, API_KEY, r.RemoteAddr)
}
resp, err := client.Get(url)
if err != nil {
return "", err, http.StatusInternalServerError
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", err, http.StatusInternalServerError
}
return string(body), nil, http.StatusOK
}
func print(w http.ResponseWriter, r *http.Request, indented string) {
color := r.FormValue("color")
if color == "true" {
printColor(w, r, indented)
} else {
callback := santizeCallback(r.FormValue("callback"))
if callback != "" {
w.Header().Set("Content-type", "application/javascript")
fmt.Fprintf(w, "%s(%s)", callback, indented)
} else {
w.Header().Set("Content-type", "application/json")
fmt.Fprint(w, indented)
}
}
}
func printColor(w http.ResponseWriter, r *http.Request, indented string) {
t, err := template.ParseFiles(COLOR_TEMPLATE)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
} else {
data := map[string]interface{}{"Indented": template.HTML(indented)}
t.Execute(w, data)
}
}
func indent(w http.ResponseWriter, r *http.Request) {
content, err, status := content(w, r)
if err != nil {
http.Error(w, err.Error(), status)
return
}
buffer := bytes.NewBuffer([]byte{})
err = json.Indent(buffer, []byte(content), "", " ")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
print(w, r, buffer.String())
}