104 lines
2.8 KiB
Go
104 lines
2.8 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/api/resolver"
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"github.com/micro/go-micro/v2/auth"
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)
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// CombinedAuthHandler wraps a server and authenticates requests
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func CombinedAuthHandler(namespace string, r resolver.Resolver, h http.Handler) http.Handler {
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return authHandler{
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handler: h,
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resolver: r,
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auth: auth.DefaultAuth,
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namespace: namespace,
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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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resolver resolver.Resolver
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namespace string
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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, auth.BearerScheme) {
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token = header[len(auth.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.TokenCookieName+"=")
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req.Header.Set("Authorization", auth.BearerScheme+token)
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}
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}
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// Get the account using the token, fallback to a blank account
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// since some endpoints can be unauthenticated, so the lack of an
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// account doesn't necesserially mean a forbidden request
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acc, err := h.auth.Inspect(token)
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if err != nil {
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acc = &auth.Account{}
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}
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// Determine the name of the service being requested
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endpoint, err := h.resolver.Resolve(req)
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if err == resolver.ErrInvalidPath || err == resolver.ErrNotFound {
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// a file not served by the resolver has been requested (e.g. favicon.ico)
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endpoint = &resolver.Endpoint{Path: req.URL.Path}
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} else if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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return
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}
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// construct the resource name, e.g. home => go.micro.web.home
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resName := h.namespace
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if len(endpoint.Name) > 0 {
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resName = resName + "." + endpoint.Name
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}
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// Perform the verification check to see if the account has access to
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// the resource they're requesting
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err = h.auth.Verify(acc, &auth.Resource{
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Type: "service",
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Name: resName,
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Endpoint: endpoint.Path,
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})
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// The account has the necessary permissions to access the
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// resource
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if err == nil {
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h.handler.ServeHTTP(w, req)
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return
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}
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// The account is set, but they don't have enough permissions,
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// hence we 403.
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if len(acc.ID) > 0 {
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w.WriteHeader(http.StatusForbidden)
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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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loginURL := h.auth.Options().LoginURL
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if loginURL == "" {
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w.WriteHeader(http.StatusUnauthorized)
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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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