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