micro/api/server/auth/auth.go

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package auth
import (
"fmt"
"net/http"
"net/url"
"strings"
"github.com/micro/go-micro/v2/auth"
)
var (
// DefaultExcludes is the paths which are allowed by default
DefaultExcludes = []string{"/favicon.ico"}
)
// CombinedAuthHandler wraps a server and authenticates requests
func CombinedAuthHandler(h http.Handler) http.Handler {
return authHandler{
handler: h,
auth: auth.DefaultAuth,
}
}
type authHandler struct {
handler http.Handler
auth auth.Auth
}
const (
// BearerScheme is the prefix in the auth header
BearerScheme = "Bearer "
)
func (h authHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// Extract the token from the request
var token string
if header := req.Header.Get("Authorization"); len(header) > 0 {
// Extract the auth token from the request
if strings.HasPrefix(header, BearerScheme) {
token = header[len(BearerScheme):]
}
} else {
// Get the token out the cookies if not provided in headers
if c, err := req.Cookie("micro-token"); err == nil && c != nil {
token = strings.TrimPrefix(c.Value, auth.CookieName+"=")
req.Header.Set("Authorization", BearerScheme+token)
}
}
// Return if the user disabled auth on this endpoint
excludes := h.auth.Options().Exclude
excludes = append(excludes, DefaultExcludes...)
loginURL := h.auth.Options().LoginURL
if len(loginURL) > 0 {
excludes = append(excludes, loginURL)
}
for _, e := range excludes {
// is a standard exclude, e.g. /rpc
if e == req.URL.Path {
h.handler.ServeHTTP(w, req)
return
}
// is a wildcard exclude, e.g. /services/*
wildcard := strings.Replace(e, "*", "", 1)
if strings.HasSuffix(e, "*") && strings.HasPrefix(req.URL.Path, wildcard) {
h.handler.ServeHTTP(w, req)
return
}
}
// If the token is valid, allow the request
if _, err := h.auth.Verify(token); err == nil {
h.handler.ServeHTTP(w, req)
return
}
// If there is no auth login url set, 401
if loginURL == "" {
w.WriteHeader(401)
return
}
// Redirect to the login path
params := url.Values{"redirect_to": {req.URL.Path}}
loginWithRedirect := fmt.Sprintf("%v?%v", loginURL, params.Encode())
http.Redirect(w, req, loginWithRedirect, http.StatusTemporaryRedirect)
}