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middlewareAuth.go
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middlewareAuth.go
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// Licensed to NASA JPL under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. NASA JPL licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package endpoints
import (
"fmt"
"net/http"
"strings"
"github.com/pixlise/core/v4/api/permission"
"github.com/pixlise/core/v4/core/jwtparser"
"github.com/pixlise/core/v4/core/logger"
)
////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Authentication stuff
// See:
// https://auth0.com/blog/authentication-in-golang/
// https://github.com/auth0-community/auth0-go
type AuthMiddleWareData struct {
RoutePermissionsRequired map[string]string
JWTValidator jwtparser.JWTInterface
Logger logger.ILogger
}
func isMatch(uri string, route string) bool {
// Expect both to start with the same method
methods := []string{"GET", "POST", "PUT", "DELETE"}
uriMethod := ""
for c := range methods {
if strings.HasPrefix(uri, methods[c]+"/") {
uriMethod = methods[c]
break
}
}
// If we didn't find a method...
if len(uriMethod) <= 0 {
return false
}
// Make sure the route also had the same method
if !strings.HasPrefix(route, uriMethod+"/") {
return false
}
// See unit tests for what we match
uriBits := strings.Split(strings.Trim(uri[len(uriMethod)+1:], "/"), "/")
routeBits := strings.Split(strings.Trim(route[len(uriMethod)+1:], "/"), "/")
// Must match in count
if len(uriBits) != len(routeBits) {
return false
}
// Match up until the {} start
for c, uriBit := range uriBits {
routeBit := routeBits[c]
// If either is blank, something is wrong
if len(uriBit) <= 0 || len(routeBit) <= 0 {
return false
}
routeBitIsVar := len(routeBit) > 2 && routeBit[0:1] == "{" && routeBit[len(routeBit)-1:] == "}"
if c > 0 && routeBitIsVar {
// We don't check these, as it's a var replacement, but continue on in case the next element has to match...
continue
}
if uriBit != routeBit {
return false
}
}
// Matched the above
return true
}
func (a *AuthMiddleWareData) getPermissionsForURI(method string, uri string) (string, error) {
// NOTE: we need to chop off query strings if any
uriBits := strings.Split(uri, "?")
if len(uriBits) > 1 {
uri = uriBits[0]
}
// Try a direct match
permissionRequired, ok := a.RoutePermissionsRequired[method+uri]
if ok {
return permissionRequired, nil
}
// No direct match, but we might find that it matches a URI that has {ids} in it
for route, perm := range a.RoutePermissionsRequired {
if isMatch(method+uri, route) {
return perm, nil
}
}
// No permission defined, so just fail it
return "", fmt.Errorf("Permissions not defined for route: %v %v", method, uri)
}
func (a *AuthMiddleWareData) Middleware(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Get the permission required for this route
permissionRequired, err := a.getPermissionsForURI(r.Method, r.RequestURI)
if err != nil {
// No permission defined, so just fail it
a.Logger.Errorf("No permission found for URI %v. %v", r.RequestURI, err)
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("Unauthorized - Bad route permissions"))
return
}
// If we don't care about what permissions are required, it's public, so just allow it through
if permissionRequired == permission.PermPublic {
next.ServeHTTP(w, r)
return
}
// Validate the token
token, err := a.JWTValidator.ValidateRequest(r)
if err != nil {
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("Unauthorized - Bad token"))
return
}
// Read claims
claims := map[string]interface{}{}
err = a.JWTValidator.Claims(r, token, &claims)
if err != nil {
a.Logger.Errorf("Failed to read claims from JWT: %v", err)
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("Unauthorized - Bad claims"))
return
}
// Make sure the permission required matches one of the claims
permissions, err := jwtparser.ReadPermissions(claims)
if err != nil {
// No permission defined, so just fail it
a.Logger.Errorf("No permissions defined in claims. Error: %v", err)
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("Unauthorized - Bad claim permissions"))
return
}
// Check if it exists in permissions of user
if !permissions[permissionRequired] {
// Required permission is not in the claims of the JWT, so reject it
a.Logger.Errorf("Claim permissions did not contain %v for route: %v", permissionRequired, r.RequestURI)
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("Unauthorized - Route not permitted"))
return
}
next.ServeHTTP(w, r)
})
}