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utils.go
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utils.go
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package main
import (
"errors"
"log"
"net/http"
"os"
"strings"
)
func check(err error) {
if err != nil {
panic(err)
}
}
// Enables cross origin control access for a handler.
func enableCors(w *http.ResponseWriter) {
(*w).Header().Set("Access-Control-Allow-Origin", "*")
}
// Authorization headers are in the format of -
// "Token {key}"
// The string should be split with a whitespace and the
// second part should be return. There are a few more checks
// can be implemented but this works just fine for almost
// all check cases.
func extractKeyFromToken(token string) (string, error) {
splitString := strings.Split(token, " ")
if len(splitString) == 2 {
if splitString[0] == "Token" {
return splitString[1], nil
}
return "", errors.New("Invalid token.")
}
return "", errors.New("Authentication credentials were not provided.")
}
// Helper method to make sure a handler is authenticated.
func authorizedRequest(r *http.Request) (string, error) {
headerToken := r.Header.Get("Authorization")
key, err := extractKeyFromToken(headerToken)
if err != nil {
return "", err
}
username, err := getAuthorUsernameFromKey(key)
if err == nil {
return username, nil
}
return "", err
}
// Receives a "map" like object (an HTTP POST request Form field)
// and a list of strings acting as values for the map object to
// determine whether they all exist in the map. If not, return an
// error with the name of the field, else, return nil
func formBodyContainsKeys(r *http.Request, keys []string) error {
var value string
for _, key := range keys {
value = r.Form.Get(key)
if value == "" {
return errors.New(key)
}
}
return nil
}
func openLogFile(logfile string) {
if logfile != "" {
lf, err := os.OpenFile(logfile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0640)
if err != nil {
log.Fatal("OpenLogfile: os.OpenFile:", err)
}
log.SetOutput(lf)
}
}
func requestLogger(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log.Printf("%s %s\n", r.Method, r.URL)
handler.ServeHTTP(w, r)
})
}