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authenticator.go
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170 lines (148 loc) · 4.04 KB
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package stream
import (
"fmt"
"net/http"
"github.com/golang-jwt/jwt/v4"
)
type authFunc func(*http.Request) error
type resource string
const (
resFollower resource = "follower"
resActivities resource = "activities"
resFeed resource = "feed"
resFeedTargets resource = "feed_targets"
resCollections resource = "collections"
resUsers resource = "users"
resReactions resource = "reactions"
resPersonalization resource = "personalization"
resAnalytics resource = "analytics"
resAnalyticsRedirect resource = "redirect_and_track"
resModeration resource = "moderation"
resAuditLogs resource = "audit_logs"
)
type action string
const (
actionRead action = "read"
actionWrite action = "write"
actionDelete action = "delete"
)
var actions = map[string]action{
http.MethodGet: actionRead,
http.MethodOptions: actionRead,
http.MethodHead: actionRead,
http.MethodPost: actionWrite,
http.MethodPut: actionWrite,
http.MethodPatch: actionWrite,
http.MethodDelete: actionDelete,
}
type authenticator struct {
secret string
}
func (a authenticator) feedID(feed Feed) string {
if feed == nil {
return "*"
}
return fmt.Sprintf("%s%s", feed.Slug(), feed.UserID())
}
func (a authenticator) feedAuth(resource resource, feed Feed) authFunc {
return func(req *http.Request) error {
var feedID string
if feed != nil {
feedID = a.feedID(feed)
} else {
feedID = "*"
}
return a.jwtSignRequest(req, a.jwtFeedClaims(resource, actions[req.Method], feedID))
}
}
func (a authenticator) collectionsAuth(req *http.Request) error {
claims := jwt.MapClaims{
"action": "*",
"feed_id": "*",
"resource": resCollections,
}
return a.jwtSignRequest(req, claims)
}
func (a authenticator) usersAuth(req *http.Request) error {
claims := jwt.MapClaims{
"action": "*",
"feed_id": "*",
"resource": resUsers,
}
return a.jwtSignRequest(req, claims)
}
func (a authenticator) reactionsAuth(req *http.Request) error {
claims := jwt.MapClaims{
"action": "*",
"feed_id": "*",
"resource": resReactions,
}
return a.jwtSignRequest(req, claims)
}
func (a authenticator) personalizationAuth(req *http.Request) error {
claims := jwt.MapClaims{
"action": "*",
"user_id": "*",
"feed_id": "*",
"resource": resPersonalization,
}
return a.jwtSignRequest(req, claims)
}
func (a authenticator) analyticsAuth(req *http.Request) error {
claims := jwt.MapClaims{
"action": "*",
"user_id": "*",
"resource": resAnalytics,
}
return a.jwtSignRequest(req, claims)
}
func (a authenticator) moderationAuth(req *http.Request) error {
claims := jwt.MapClaims{
"action": "*",
"feed_id": "*",
"resource": resModeration,
}
return a.jwtSignRequest(req, claims)
}
func (a authenticator) auditLogsAuth(req *http.Request) error {
claims := jwt.MapClaims{
"action": "*",
"feed_id": "*",
"resource": resAuditLogs,
}
return a.jwtSignRequest(req, claims)
}
func (a authenticator) signAnalyticsRedirectEndpoint(endpoint *endpoint) error {
claims := jwt.MapClaims{
"action": "*",
"user_id": "*",
"resource": resAnalyticsRedirect,
}
signature, err := a.jwtSignatureFromClaims(claims)
if err != nil {
return err
}
endpoint.addQueryParam(makeRequestOption("stream-auth-type", "jwt"))
endpoint.addQueryParam(makeRequestOption("authorization", signature))
return nil
}
func (a authenticator) jwtSignatureFromClaims(claims jwt.MapClaims) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString([]byte(a.secret))
}
func (a authenticator) jwtFeedClaims(resource resource, action action, feedID string) jwt.MapClaims {
return jwt.MapClaims{
"resource": resource,
"action": action,
"feed_id": feedID,
}
}
func (a authenticator) jwtSignRequest(req *http.Request, claims jwt.MapClaims) error {
auth, err := a.jwtSignatureFromClaims(claims)
if err != nil {
return fmt.Errorf("cannot make auth: %w", err)
}
req.Header.Add("Stream-Auth-Type", "jwt")
req.Header.Add("Authorization", auth)
return nil
}