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interceptor.go
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interceptor.go
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package http
import (
"context"
"crypto/tls"
"fmt"
"regexp"
"strings"
"github.com/plgd-dev/hub/v2/pkg/security/jwt"
)
type Interceptor = func(ctx context.Context, method, uri string) (context.Context, error)
type AuthArgs struct {
URI *regexp.Regexp
Scopes []*regexp.Regexp
}
// RequestMatcher allows request without token validation.
type RequestMatcher struct {
Method string
URI *regexp.Regexp
}
// NewInterceptor authorizes HTTP request with validator.
func NewInterceptorWithValidator(validator Validator, auths map[string][]AuthArgs, whiteList ...RequestMatcher) Interceptor {
validateJWT := validateJWTWithValidator(validator, MakeClaimsFunc(auths))
return func(ctx context.Context, method, uri string) (context.Context, error) {
for _, wa := range whiteList {
if strings.EqualFold(method, wa.Method) && wa.URI.MatchString(uri) {
return ctx, nil
}
}
return validateJWT(ctx, method, uri)
}
}
// NewInterceptor authorizes HTTP request.
func NewInterceptor(jwksURL string, tls *tls.Config, auths map[string][]AuthArgs, whiteList ...RequestMatcher) Interceptor {
validateJWT := validateJWT(jwksURL, tls, MakeClaimsFunc(auths))
return func(ctx context.Context, method, uri string) (context.Context, error) {
for _, wa := range whiteList {
if strings.EqualFold(method, wa.Method) && wa.URI.MatchString(uri) {
return ctx, nil
}
}
return validateJWT(ctx, method, uri)
}
}
func MakeClaimsFunc(methods map[string][]AuthArgs) ClaimsFunc {
return func(ctx context.Context, method, uri string) Claims {
args, ok := methods[method]
if !ok {
return &DeniedClaims{fmt.Errorf("inaccessible method: %v", method)}
}
for _, arg := range args {
if arg.URI.MatchString(uri) {
return jwt.NewRegexpScopeClaims(arg.Scopes...)
}
}
return &DeniedClaims{fmt.Errorf("inaccessible uri: %v %v", method, uri)}
}
}
type DeniedClaims struct {
Err error
}
func (c DeniedClaims) Valid() error {
return c.Err
}