mirror of
https://github.com/superseriousbusiness/gotosocial.git
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538 lines
21 KiB
Go
538 lines
21 KiB
Go
package runtime
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"net/textproto"
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"regexp"
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"strings"
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"github.com/grpc-ecosystem/grpc-gateway/v2/internal/httprule"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/grpclog"
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"google.golang.org/grpc/health/grpc_health_v1"
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"google.golang.org/grpc/metadata"
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"google.golang.org/grpc/status"
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"google.golang.org/protobuf/proto"
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)
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// UnescapingMode defines the behavior of ServeMux when unescaping path parameters.
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type UnescapingMode int
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const (
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// UnescapingModeLegacy is the default V2 behavior, which escapes the entire
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// path string before doing any routing.
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UnescapingModeLegacy UnescapingMode = iota
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// UnescapingModeAllExceptReserved unescapes all path parameters except RFC 6570
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// reserved characters.
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UnescapingModeAllExceptReserved
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// UnescapingModeAllExceptSlash unescapes URL path parameters except path
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// separators, which will be left as "%2F".
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UnescapingModeAllExceptSlash
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// UnescapingModeAllCharacters unescapes all URL path parameters.
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UnescapingModeAllCharacters
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// UnescapingModeDefault is the default escaping type.
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// TODO(v3): default this to UnescapingModeAllExceptReserved per grpc-httpjson-transcoding's
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// reference implementation
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UnescapingModeDefault = UnescapingModeLegacy
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)
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var encodedPathSplitter = regexp.MustCompile("(/|%2F)")
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// A HandlerFunc handles a specific pair of path pattern and HTTP method.
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type HandlerFunc func(w http.ResponseWriter, r *http.Request, pathParams map[string]string)
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// A Middleware handler wraps another HandlerFunc to do some pre- and/or post-processing of the request. This is used as an alternative to gRPC interceptors when using the direct-to-implementation
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// registration methods. It is generally recommended to use gRPC client or server interceptors instead
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// where possible.
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type Middleware func(HandlerFunc) HandlerFunc
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// ServeMux is a request multiplexer for grpc-gateway.
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// It matches http requests to patterns and invokes the corresponding handler.
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type ServeMux struct {
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// handlers maps HTTP method to a list of handlers.
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handlers map[string][]handler
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middlewares []Middleware
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forwardResponseOptions []func(context.Context, http.ResponseWriter, proto.Message) error
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forwardResponseRewriter ForwardResponseRewriter
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marshalers marshalerRegistry
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incomingHeaderMatcher HeaderMatcherFunc
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outgoingHeaderMatcher HeaderMatcherFunc
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outgoingTrailerMatcher HeaderMatcherFunc
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metadataAnnotators []func(context.Context, *http.Request) metadata.MD
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errorHandler ErrorHandlerFunc
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streamErrorHandler StreamErrorHandlerFunc
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routingErrorHandler RoutingErrorHandlerFunc
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disablePathLengthFallback bool
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unescapingMode UnescapingMode
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}
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// ServeMuxOption is an option that can be given to a ServeMux on construction.
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type ServeMuxOption func(*ServeMux)
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// ForwardResponseRewriter is the signature of a function that is capable of rewriting messages
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// before they are forwarded in a unary, stream, or error response.
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type ForwardResponseRewriter func(ctx context.Context, response proto.Message) (any, error)
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// WithForwardResponseRewriter returns a ServeMuxOption that allows for implementers to insert logic
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// that can rewrite the final response before it is forwarded.
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//
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// The response rewriter function is called during unary message forwarding, stream message
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// forwarding and when errors are being forwarded.
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//
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// NOTE: Using this option will likely make what is generated by `protoc-gen-openapiv2` incorrect.
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// Since this option involves making runtime changes to the response shape or type.
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func WithForwardResponseRewriter(fwdResponseRewriter ForwardResponseRewriter) ServeMuxOption {
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return func(sm *ServeMux) {
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sm.forwardResponseRewriter = fwdResponseRewriter
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}
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}
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// WithForwardResponseOption returns a ServeMuxOption representing the forwardResponseOption.
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//
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// forwardResponseOption is an option that will be called on the relevant context.Context,
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// http.ResponseWriter, and proto.Message before every forwarded response.
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//
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// The message may be nil in the case where just a header is being sent.
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func WithForwardResponseOption(forwardResponseOption func(context.Context, http.ResponseWriter, proto.Message) error) ServeMuxOption {
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return func(serveMux *ServeMux) {
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serveMux.forwardResponseOptions = append(serveMux.forwardResponseOptions, forwardResponseOption)
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}
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}
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// WithUnescapingMode sets the escaping type. See the definitions of UnescapingMode
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// for more information.
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func WithUnescapingMode(mode UnescapingMode) ServeMuxOption {
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return func(serveMux *ServeMux) {
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serveMux.unescapingMode = mode
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}
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}
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// WithMiddlewares sets server middleware for all handlers. This is useful as an alternative to gRPC
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// interceptors when using the direct-to-implementation registration methods and cannot rely
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// on gRPC interceptors. It's recommended to use gRPC interceptors instead if possible.
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func WithMiddlewares(middlewares ...Middleware) ServeMuxOption {
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return func(serveMux *ServeMux) {
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serveMux.middlewares = append(serveMux.middlewares, middlewares...)
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}
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}
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// SetQueryParameterParser sets the query parameter parser, used to populate message from query parameters.
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// Configuring this will mean the generated OpenAPI output is no longer correct, and it should be
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// done with careful consideration.
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func SetQueryParameterParser(queryParameterParser QueryParameterParser) ServeMuxOption {
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return func(serveMux *ServeMux) {
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currentQueryParser = queryParameterParser
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}
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}
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// HeaderMatcherFunc checks whether a header key should be forwarded to/from gRPC context.
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type HeaderMatcherFunc func(string) (string, bool)
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// DefaultHeaderMatcher is used to pass http request headers to/from gRPC context. This adds permanent HTTP header
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// keys (as specified by the IANA, e.g: Accept, Cookie, Host) to the gRPC metadata with the grpcgateway- prefix. If you want to know which headers are considered permanent, you can view the isPermanentHTTPHeader function.
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// HTTP headers that start with 'Grpc-Metadata-' are mapped to gRPC metadata after removing the prefix 'Grpc-Metadata-'.
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// Other headers are not added to the gRPC metadata.
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func DefaultHeaderMatcher(key string) (string, bool) {
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switch key = textproto.CanonicalMIMEHeaderKey(key); {
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case isPermanentHTTPHeader(key):
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return MetadataPrefix + key, true
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case strings.HasPrefix(key, MetadataHeaderPrefix):
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return key[len(MetadataHeaderPrefix):], true
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}
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return "", false
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}
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func defaultOutgoingHeaderMatcher(key string) (string, bool) {
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return fmt.Sprintf("%s%s", MetadataHeaderPrefix, key), true
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}
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func defaultOutgoingTrailerMatcher(key string) (string, bool) {
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return fmt.Sprintf("%s%s", MetadataTrailerPrefix, key), true
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}
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// WithIncomingHeaderMatcher returns a ServeMuxOption representing a headerMatcher for incoming request to gateway.
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//
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// This matcher will be called with each header in http.Request. If matcher returns true, that header will be
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// passed to gRPC context. To transform the header before passing to gRPC context, matcher should return the modified header.
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func WithIncomingHeaderMatcher(fn HeaderMatcherFunc) ServeMuxOption {
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for _, header := range fn.matchedMalformedHeaders() {
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grpclog.Warningf("The configured forwarding filter would allow %q to be sent to the gRPC server, which will likely cause errors. See https://github.com/grpc/grpc-go/pull/4803#issuecomment-986093310 for more information.", header)
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}
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return func(mux *ServeMux) {
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mux.incomingHeaderMatcher = fn
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}
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}
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// matchedMalformedHeaders returns the malformed headers that would be forwarded to gRPC server.
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func (fn HeaderMatcherFunc) matchedMalformedHeaders() []string {
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if fn == nil {
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return nil
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}
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headers := make([]string, 0)
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for header := range malformedHTTPHeaders {
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out, accept := fn(header)
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if accept && isMalformedHTTPHeader(out) {
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headers = append(headers, out)
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}
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}
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return headers
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}
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// WithOutgoingHeaderMatcher returns a ServeMuxOption representing a headerMatcher for outgoing response from gateway.
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//
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// This matcher will be called with each header in response header metadata. If matcher returns true, that header will be
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// passed to http response returned from gateway. To transform the header before passing to response,
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// matcher should return the modified header.
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func WithOutgoingHeaderMatcher(fn HeaderMatcherFunc) ServeMuxOption {
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return func(mux *ServeMux) {
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mux.outgoingHeaderMatcher = fn
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}
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}
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// WithOutgoingTrailerMatcher returns a ServeMuxOption representing a headerMatcher for outgoing response from gateway.
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//
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// This matcher will be called with each header in response trailer metadata. If matcher returns true, that header will be
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// passed to http response returned from gateway. To transform the header before passing to response,
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// matcher should return the modified header.
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func WithOutgoingTrailerMatcher(fn HeaderMatcherFunc) ServeMuxOption {
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return func(mux *ServeMux) {
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mux.outgoingTrailerMatcher = fn
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}
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}
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// WithMetadata returns a ServeMuxOption for passing metadata to a gRPC context.
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//
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// This can be used by services that need to read from http.Request and modify gRPC context. A common use case
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// is reading token from cookie and adding it in gRPC context.
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func WithMetadata(annotator func(context.Context, *http.Request) metadata.MD) ServeMuxOption {
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return func(serveMux *ServeMux) {
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serveMux.metadataAnnotators = append(serveMux.metadataAnnotators, annotator)
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}
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}
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// WithErrorHandler returns a ServeMuxOption for configuring a custom error handler.
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//
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// This can be used to configure a custom error response.
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func WithErrorHandler(fn ErrorHandlerFunc) ServeMuxOption {
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return func(serveMux *ServeMux) {
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serveMux.errorHandler = fn
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}
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}
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// WithStreamErrorHandler returns a ServeMuxOption that will use the given custom stream
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// error handler, which allows for customizing the error trailer for server-streaming
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// calls.
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//
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// For stream errors that occur before any response has been written, the mux's
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// ErrorHandler will be invoked. However, once data has been written, the errors must
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// be handled differently: they must be included in the response body. The response body's
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// final message will include the error details returned by the stream error handler.
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func WithStreamErrorHandler(fn StreamErrorHandlerFunc) ServeMuxOption {
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return func(serveMux *ServeMux) {
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serveMux.streamErrorHandler = fn
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}
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}
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// WithRoutingErrorHandler returns a ServeMuxOption for configuring a custom error handler to handle http routing errors.
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//
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// Method called for errors which can happen before gRPC route selected or executed.
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// The following error codes: StatusMethodNotAllowed StatusNotFound StatusBadRequest
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func WithRoutingErrorHandler(fn RoutingErrorHandlerFunc) ServeMuxOption {
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return func(serveMux *ServeMux) {
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serveMux.routingErrorHandler = fn
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}
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}
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// WithDisablePathLengthFallback returns a ServeMuxOption for disable path length fallback.
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func WithDisablePathLengthFallback() ServeMuxOption {
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return func(serveMux *ServeMux) {
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serveMux.disablePathLengthFallback = true
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}
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}
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// WithHealthEndpointAt returns a ServeMuxOption that will add an endpoint to the created ServeMux at the path specified by endpointPath.
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// When called the handler will forward the request to the upstream grpc service health check (defined in the
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// gRPC Health Checking Protocol).
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//
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// See here https://grpc-ecosystem.github.io/grpc-gateway/docs/operations/health_check/ for more information on how
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// to setup the protocol in the grpc server.
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//
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// If you define a service as query parameter, this will also be forwarded as service in the HealthCheckRequest.
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func WithHealthEndpointAt(healthCheckClient grpc_health_v1.HealthClient, endpointPath string) ServeMuxOption {
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return func(s *ServeMux) {
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// error can be ignored since pattern is definitely valid
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_ = s.HandlePath(
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http.MethodGet, endpointPath, func(w http.ResponseWriter, r *http.Request, _ map[string]string,
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) {
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_, outboundMarshaler := MarshalerForRequest(s, r)
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resp, err := healthCheckClient.Check(r.Context(), &grpc_health_v1.HealthCheckRequest{
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Service: r.URL.Query().Get("service"),
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})
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if err != nil {
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s.errorHandler(r.Context(), s, outboundMarshaler, w, r, err)
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return
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}
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w.Header().Set("Content-Type", "application/json")
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if resp.GetStatus() != grpc_health_v1.HealthCheckResponse_SERVING {
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switch resp.GetStatus() {
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case grpc_health_v1.HealthCheckResponse_NOT_SERVING, grpc_health_v1.HealthCheckResponse_UNKNOWN:
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err = status.Error(codes.Unavailable, resp.String())
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case grpc_health_v1.HealthCheckResponse_SERVICE_UNKNOWN:
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err = status.Error(codes.NotFound, resp.String())
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}
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s.errorHandler(r.Context(), s, outboundMarshaler, w, r, err)
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return
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}
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_ = outboundMarshaler.NewEncoder(w).Encode(resp)
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})
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}
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}
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// WithHealthzEndpoint returns a ServeMuxOption that will add a /healthz endpoint to the created ServeMux.
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//
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// See WithHealthEndpointAt for the general implementation.
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func WithHealthzEndpoint(healthCheckClient grpc_health_v1.HealthClient) ServeMuxOption {
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return WithHealthEndpointAt(healthCheckClient, "/healthz")
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}
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// NewServeMux returns a new ServeMux whose internal mapping is empty.
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func NewServeMux(opts ...ServeMuxOption) *ServeMux {
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serveMux := &ServeMux{
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handlers: make(map[string][]handler),
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forwardResponseOptions: make([]func(context.Context, http.ResponseWriter, proto.Message) error, 0),
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forwardResponseRewriter: func(ctx context.Context, response proto.Message) (any, error) { return response, nil },
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marshalers: makeMarshalerMIMERegistry(),
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errorHandler: DefaultHTTPErrorHandler,
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streamErrorHandler: DefaultStreamErrorHandler,
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routingErrorHandler: DefaultRoutingErrorHandler,
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unescapingMode: UnescapingModeDefault,
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}
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for _, opt := range opts {
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opt(serveMux)
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}
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if serveMux.incomingHeaderMatcher == nil {
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serveMux.incomingHeaderMatcher = DefaultHeaderMatcher
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}
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if serveMux.outgoingHeaderMatcher == nil {
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serveMux.outgoingHeaderMatcher = defaultOutgoingHeaderMatcher
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}
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if serveMux.outgoingTrailerMatcher == nil {
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serveMux.outgoingTrailerMatcher = defaultOutgoingTrailerMatcher
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}
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return serveMux
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}
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// Handle associates "h" to the pair of HTTP method and path pattern.
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func (s *ServeMux) Handle(meth string, pat Pattern, h HandlerFunc) {
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if len(s.middlewares) > 0 {
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h = chainMiddlewares(s.middlewares)(h)
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}
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s.handlers[meth] = append([]handler{{pat: pat, h: h}}, s.handlers[meth]...)
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}
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// HandlePath allows users to configure custom path handlers.
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// refer: https://grpc-ecosystem.github.io/grpc-gateway/docs/operations/inject_router/
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func (s *ServeMux) HandlePath(meth string, pathPattern string, h HandlerFunc) error {
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compiler, err := httprule.Parse(pathPattern)
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if err != nil {
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return fmt.Errorf("parsing path pattern: %w", err)
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}
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tp := compiler.Compile()
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pattern, err := NewPattern(tp.Version, tp.OpCodes, tp.Pool, tp.Verb)
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if err != nil {
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return fmt.Errorf("creating new pattern: %w", err)
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}
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s.Handle(meth, pattern, h)
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return nil
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}
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// ServeHTTP dispatches the request to the first handler whose pattern matches to r.Method and r.URL.Path.
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func (s *ServeMux) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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path := r.URL.Path
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if !strings.HasPrefix(path, "/") {
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_, outboundMarshaler := MarshalerForRequest(s, r)
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s.routingErrorHandler(ctx, s, outboundMarshaler, w, r, http.StatusBadRequest)
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return
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}
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// TODO(v3): remove UnescapingModeLegacy
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if s.unescapingMode != UnescapingModeLegacy && r.URL.RawPath != "" {
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path = r.URL.RawPath
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}
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if override := r.Header.Get("X-HTTP-Method-Override"); override != "" && s.isPathLengthFallback(r) {
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if err := r.ParseForm(); err != nil {
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_, outboundMarshaler := MarshalerForRequest(s, r)
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sterr := status.Error(codes.InvalidArgument, err.Error())
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s.errorHandler(ctx, s, outboundMarshaler, w, r, sterr)
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return
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}
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r.Method = strings.ToUpper(override)
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}
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var pathComponents []string
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// since in UnescapeModeLegacy, the URL will already have been fully unescaped, if we also split on "%2F"
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// in this escaping mode we would be double unescaping but in UnescapingModeAllCharacters, we still do as the
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// path is the RawPath (i.e. unescaped). That does mean that the behavior of this function will change its default
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// behavior when the UnescapingModeDefault gets changed from UnescapingModeLegacy to UnescapingModeAllExceptReserved
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if s.unescapingMode == UnescapingModeAllCharacters {
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pathComponents = encodedPathSplitter.Split(path[1:], -1)
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} else {
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pathComponents = strings.Split(path[1:], "/")
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}
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lastPathComponent := pathComponents[len(pathComponents)-1]
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for _, h := range s.handlers[r.Method] {
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// If the pattern has a verb, explicitly look for a suffix in the last
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// component that matches a colon plus the verb. This allows us to
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// handle some cases that otherwise can't be correctly handled by the
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// former LastIndex case, such as when the verb literal itself contains
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// a colon. This should work for all cases that have run through the
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// parser because we know what verb we're looking for, however, there
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// are still some cases that the parser itself cannot disambiguate. See
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// the comment there if interested.
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var verb string
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patVerb := h.pat.Verb()
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idx := -1
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if patVerb != "" && strings.HasSuffix(lastPathComponent, ":"+patVerb) {
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idx = len(lastPathComponent) - len(patVerb) - 1
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}
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if idx == 0 {
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_, outboundMarshaler := MarshalerForRequest(s, r)
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s.routingErrorHandler(ctx, s, outboundMarshaler, w, r, http.StatusNotFound)
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return
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}
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comps := make([]string, len(pathComponents))
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copy(comps, pathComponents)
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if idx > 0 {
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comps[len(comps)-1], verb = lastPathComponent[:idx], lastPathComponent[idx+1:]
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}
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pathParams, err := h.pat.MatchAndEscape(comps, verb, s.unescapingMode)
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if err != nil {
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var mse MalformedSequenceError
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if ok := errors.As(err, &mse); ok {
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_, outboundMarshaler := MarshalerForRequest(s, r)
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s.errorHandler(ctx, s, outboundMarshaler, w, r, &HTTPStatusError{
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HTTPStatus: http.StatusBadRequest,
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Err: mse,
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})
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}
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continue
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}
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s.handleHandler(h, w, r, pathParams)
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return
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}
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// if no handler has found for the request, lookup for other methods
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// to handle POST -> GET fallback if the request is subject to path
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// length fallback.
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// Note we are not eagerly checking the request here as we want to return the
|
|
// right HTTP status code, and we need to process the fallback candidates in
|
|
// order to do that.
|
|
for m, handlers := range s.handlers {
|
|
if m == r.Method {
|
|
continue
|
|
}
|
|
for _, h := range handlers {
|
|
var verb string
|
|
patVerb := h.pat.Verb()
|
|
|
|
idx := -1
|
|
if patVerb != "" && strings.HasSuffix(lastPathComponent, ":"+patVerb) {
|
|
idx = len(lastPathComponent) - len(patVerb) - 1
|
|
}
|
|
|
|
comps := make([]string, len(pathComponents))
|
|
copy(comps, pathComponents)
|
|
|
|
if idx > 0 {
|
|
comps[len(comps)-1], verb = lastPathComponent[:idx], lastPathComponent[idx+1:]
|
|
}
|
|
|
|
pathParams, err := h.pat.MatchAndEscape(comps, verb, s.unescapingMode)
|
|
if err != nil {
|
|
var mse MalformedSequenceError
|
|
if ok := errors.As(err, &mse); ok {
|
|
_, outboundMarshaler := MarshalerForRequest(s, r)
|
|
s.errorHandler(ctx, s, outboundMarshaler, w, r, &HTTPStatusError{
|
|
HTTPStatus: http.StatusBadRequest,
|
|
Err: mse,
|
|
})
|
|
}
|
|
continue
|
|
}
|
|
|
|
// X-HTTP-Method-Override is optional. Always allow fallback to POST.
|
|
// Also, only consider POST -> GET fallbacks, and avoid falling back to
|
|
// potentially dangerous operations like DELETE.
|
|
if s.isPathLengthFallback(r) && m == http.MethodGet {
|
|
if err := r.ParseForm(); err != nil {
|
|
_, outboundMarshaler := MarshalerForRequest(s, r)
|
|
sterr := status.Error(codes.InvalidArgument, err.Error())
|
|
s.errorHandler(ctx, s, outboundMarshaler, w, r, sterr)
|
|
return
|
|
}
|
|
s.handleHandler(h, w, r, pathParams)
|
|
return
|
|
}
|
|
_, outboundMarshaler := MarshalerForRequest(s, r)
|
|
s.routingErrorHandler(ctx, s, outboundMarshaler, w, r, http.StatusMethodNotAllowed)
|
|
return
|
|
}
|
|
}
|
|
|
|
_, outboundMarshaler := MarshalerForRequest(s, r)
|
|
s.routingErrorHandler(ctx, s, outboundMarshaler, w, r, http.StatusNotFound)
|
|
}
|
|
|
|
// GetForwardResponseOptions returns the ForwardResponseOptions associated with this ServeMux.
|
|
func (s *ServeMux) GetForwardResponseOptions() []func(context.Context, http.ResponseWriter, proto.Message) error {
|
|
return s.forwardResponseOptions
|
|
}
|
|
|
|
func (s *ServeMux) isPathLengthFallback(r *http.Request) bool {
|
|
return !s.disablePathLengthFallback && r.Method == "POST" && r.Header.Get("Content-Type") == "application/x-www-form-urlencoded"
|
|
}
|
|
|
|
type handler struct {
|
|
pat Pattern
|
|
h HandlerFunc
|
|
}
|
|
|
|
func (s *ServeMux) handleHandler(h handler, w http.ResponseWriter, r *http.Request, pathParams map[string]string) {
|
|
h.h(w, r.WithContext(withHTTPPattern(r.Context(), h.pat)), pathParams)
|
|
}
|
|
|
|
func chainMiddlewares(mws []Middleware) Middleware {
|
|
return func(next HandlerFunc) HandlerFunc {
|
|
for i := len(mws); i > 0; i-- {
|
|
next = mws[i-1](next)
|
|
}
|
|
return next
|
|
}
|
|
}
|