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handling.go
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handling.go
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package http_ns
import (
"html"
"maps"
"net/http"
"slices"
"github.com/inoxlang/inox/internal/core"
"github.com/inoxlang/inox/internal/globals/http_ns/spec"
jsoniter "github.com/inoxlang/inox/internal/jsoniter"
"github.com/inoxlang/inox/internal/mimeconsts"
"github.com/inoxlang/inox/internal/utils"
"github.com/rs/zerolog"
)
var (
DEFAULT_CSP, _ = NewCSPWithDirectives(nil)
HANDLER_DISABLED_ARGS = []bool{true, true}
)
func isValidHandlerValue(val core.Value) bool {
switch val.(type) {
case *core.InoxFunction, *core.GoFunction, *core.Mapping, core.Path, *core.Object:
return true
}
return false
}
// a handlerFn is a middleware or the final handler
type handlerFn func(*Request, *ResponseWriter, *core.GlobalState)
// addHandlerFunction creates a function of type handlerFn from handlerValue and updates the server.lastHandlerFn or server.middlewares.
// addHandlerFunction also sets server.api & server.preparedModules.
func addHandlerFunction(handlerValue core.Value, isMiddleware bool, server *HttpsServer) error {
//set value for handler based on provided arguments
switch userHandler := handlerValue.(type) {
case *core.InoxFunction:
handler := func(req *Request, rw *ResponseWriter, handlerGlobalState *core.GlobalState) {
//add parent context's patterns
serverCtx := server.state.Ctx
for k, v := range serverCtx.GetNamedPatterns() {
if handlerGlobalState.Ctx.ResolveNamedPattern(k) == nil {
handlerGlobalState.Ctx.AddNamedPattern(k, v)
}
}
for k, v := range serverCtx.GetPatternNamespaces() {
if handlerGlobalState.Ctx.ResolvePatternNamespace(k) == nil {
handlerGlobalState.Ctx.AddPatternNamespace(k, v)
}
}
//call the Inox handler
args := []core.Value{core.ValOf(rw), core.ValOf(req)}
_, err := userHandler.Call(handlerGlobalState, nil, args, HANDLER_DISABLED_ARGS)
if err != nil {
handlerGlobalState.Logger.Print(err)
}
}
if isMiddleware {
server.middlewares = append(server.middlewares, handler)
} else {
server.lastHandlerFn = handler
server.api = spec.NewEmptyAPI()
}
case *core.GoFunction:
handler := func(req *Request, rw *ResponseWriter, handlerGlobalState *core.GlobalState) {
//call the Golang handler
args := []any{rw, req}
_, err := userHandler.Call(args, handlerGlobalState, nil, false, false)
if err != nil {
handlerGlobalState.Logger.Print(err)
}
}
if isMiddleware {
server.middlewares = append(server.middlewares, handler)
} else {
server.lastHandlerFn = handler
server.api = spec.NewEmptyAPI()
}
case *core.Object:
//filesystem routing
var staticDir core.Path
var dynamicDir core.Path
propertyNames := userHandler.PropertyNames(server.state.Ctx)
if slices.Contains(propertyNames, "static") {
staticDir = userHandler.Prop(server.state.Ctx, "static").(core.Path)
}
if slices.Contains(propertyNames, "dynamic") {
dynamicDir = userHandler.Prop(server.state.Ctx, "dynamic").(core.Path)
}
return addFilesystemRoutingHandler(server, staticDir, dynamicDir, isMiddleware)
case *core.Mapping:
routing := userHandler
//if a routing Mapping is provided we compute a value by passing the request's path to the Mapping.
handler := func(req *Request, rw *ResponseWriter, handlerGlobalState *core.GlobalState) {
path := req.Path
//add parent context's patterns
serverCtx := server.state.Ctx
for k, v := range serverCtx.GetNamedPatterns() {
if handlerGlobalState.Ctx.ResolveNamedPattern(k) == nil {
handlerGlobalState.Ctx.AddNamedPattern(k, v)
}
}
for k, v := range serverCtx.GetPatternNamespaces() {
if handlerGlobalState.Ctx.ResolvePatternNamespace(k) == nil {
handlerGlobalState.Ctx.AddPatternNamespace(k, v)
}
}
//compute the result
value := routing.Compute(handlerGlobalState.Ctx, path)
if value == nil {
handlerGlobalState.Logger.Print("routing mapping returned Go nil")
rw.writeHeaders(http.StatusNotFound)
return
}
respondWithMappingResult(handlingArguments{
value: value,
req: req,
rw: rw,
state: handlerGlobalState,
server: server,
logger: handlerGlobalState.Logger,
isMiddleware: isMiddleware,
})
}
if isMiddleware {
server.middlewares = append(server.middlewares, handler)
} else {
server.lastHandlerFn = handler
server.api = spec.NewEmptyAPI()
}
default:
panic(core.ErrUnreachable)
}
return nil
}
type handlingArguments struct {
value core.Value
req *Request
rw *ResponseWriter
state *core.GlobalState
server *HttpsServer
logger zerolog.Logger
scriptsNonce string //optional
isMiddleware bool
}
func respondWithMappingResult(h handlingArguments) {
//TODO: log errors returned by response writer's methods
value := h.value
req := h.req
rw := h.rw
state := h.state
logger := h.logger
server := h.server
renderingConfig := core.RenderingInput{Mime: mimeconsts.HTML_CTYPE}
statusIfAccepted := http.StatusOK
switch v := value.(type) {
case *core.InoxFunction: // if inox handler we call it and return
args := []core.Value{core.ValOf(rw), core.ValOf(req)}
_, err := v.Call(state, nil, args, HANDLER_DISABLED_ARGS)
if err != nil {
logger.Print("error when calling returned inox function:", err)
}
return
case Status:
rw.writeHeaders(int(v.code))
return
case StatusCode:
rw.writeHeaders(int(v))
return
case *Result:
httpResult := v
maps.Copy(rw.headers(), httpResult.headers)
statusIfAccepted = int(httpResult.status)
//Add the session and session cookie.
if httpResult.session != nil {
session := httpResult.session
if server.sessions == nil {
rw.writeHeaders(http.StatusInternalServerError)
logger.Warn().Msg("returned http Result has a session but the server has no collection to store sessions")
return
}
sessionIDValue := session.Prop(state.Ctx, SESSION_ID_PROPNAME)
sessionID := sessionIDValue.(core.StringLike).GetOrBuildString()
logger.Print("add cookie")
addSessionIdCookie(rw, sessionID)
defer func() {
server.sessions.Add(state.Ctx, session)
}()
}
//Use the value inside the result
value = httpResult.value
if value == nil {
rw.writeHeaders(int(httpResult.status))
return
}
case core.Identifier:
switch v {
case "notfound":
rw.writeHeaders(http.StatusNotFound)
return
case "continue":
if h.isMiddleware {
return
}
rw.writeHeaders(http.StatusNotFound)
return
default:
logger.Print("unknwon identifier " + string(v))
rw.writeHeaders(http.StatusNotFound)
return
}
}
//if JSON is accepted we serialize if possible.
switch {
case req.AcceptAny():
break
case req.ParsedAcceptHeader.Match(mimeconsts.JSON_CTYPE):
config := core.JSONSerializationConfig{
ReprConfig: &core.ReprConfig{},
}
serializable, ok := value.(core.Serializable)
if !ok {
rw.writeHeaders(http.StatusNotAcceptable)
return
}
//finalize and send headers
rw.SetContentType(mimeconsts.JSON_CTYPE)
rw.writeHeaders(statusIfAccepted)
//write value as JSON
stream := jsoniter.NewStream(jsoniter.ConfigDefault, rw.DetachBodyWriter(), 0)
serializable.WriteJSONRepresentation(state.Ctx, stream, config, 0)
stream.Flush()
return
}
switch req.Method {
case "GET", "HEAD", "OPTIONS":
break
case "POST", "PATCH":
switch {
case req.ContentType.MatchText(mimeconsts.APP_OCTET_STREAM_CTYPE):
getData := func() ([]byte, bool) {
b, err := req.Body.ReadAllBytes()
if err != nil {
logger.Print("failed to read request's body", err)
rw.writeHeaders(http.StatusInternalServerError)
return nil, false
}
return b, true
}
if sink, ok := value.(core.StreamSink); ok {
stream, ok := sink.WritableStream(state.Ctx, nil).(*core.WritableByteStream)
if !ok {
rw.writeHeaders(http.StatusBadRequest)
return
}
b, ok := getData()
if !ok {
return
}
if err := stream.WriteBytes(state.Ctx, b); err != nil {
logger.Print("failed to write body to stream", err)
rw.writeHeaders(http.StatusInternalServerError)
return
}
} else if v, ok := value.(core.Writable); ok {
b, ok := getData()
if !ok {
return
}
if _, err := v.Writer().Write(b); err != nil {
logger.Print("failed to write body to writable", err)
rw.writeHeaders(http.StatusInternalServerError)
}
} else {
rw.writeHeaders(http.StatusBadRequest)
return
}
return
}
default:
//TODO:
// https://developer.mozilla.org/en-US/docs/web/http/status/405:
// The server must generate an Allow header field in a 405 status code response.
// The field must contain a list of methods that the target resource currently supports.
rw.writeHeaders(http.StatusMethodNotAllowed)
return
}
// rendering | event stream
loop:
for {
switch v := value.(type) {
case core.NilT, nil:
logger.Print("nil result")
rw.writeHeaders(http.StatusNotFound)
return
case core.StringLike:
if !req.ParsedAcceptHeader.Match(mimeconsts.PLAIN_TEXT_CTYPE) {
rw.writeHeaders(http.StatusNotAcceptable)
return
}
//TODO: replace non printable characters
escaped := html.EscapeString(v.GetOrBuildString())
//finalize and send headers
rw.SetContentType(mimeconsts.PLAIN_TEXT_CTYPE)
rw.writeHeaders(statusIfAccepted)
//write body
rw.DetachBodyWriter().Write(utils.StringAsBytes(escaped))
case *core.ByteSlice:
contentType := string(v.ContentType())
if !req.ParsedAcceptHeader.Match(contentType) {
rw.writeHeaders(http.StatusNotAcceptable)
return
}
//finalize and send headers
if contentType == mimeconsts.HTML_CTYPE { //TODO: use matching instead of equality
headerValue := server.defaultCSP.HeaderValue(CSPHeaderValueParams{ScriptsNonce: h.scriptsNonce})
rw.AddHeader(state.Ctx, CSP_HEADER_NAME, core.String(headerValue))
}
rw.SetContentType(contentType)
rw.writeHeaders(statusIfAccepted)
//write body
rw.DetachBodyWriter().Write(v.UnderlyingBytes())
case core.Renderable:
if !v.IsRecursivelyRenderable(state.Ctx, renderingConfig) { // get or create view
logger.Print("result is not recursively renderable, attempt to get .view() for", req.Path)
model, ok := v.(*core.Object)
if !ok {
if streamable, ok := v.(core.StreamSource); ok {
value = streamable
continue
}
rw.writeHeaders(http.StatusNotFound)
break loop
}
if !req.ParsedAcceptHeader.Match(mimeconsts.HTML_CTYPE) && !req.ParsedAcceptHeader.Match(mimeconsts.EVENT_STREAM_CTYPE) {
rw.writeHeaders(http.StatusNotAcceptable)
return
}
//TODO: pause parallel identical requests then give them the created view
properties := model.PropertyNames(state.Ctx)
var renderFn core.Value
for _, p := range properties {
if p == "render" {
renderFn = model.Prop(state.Ctx, "render")
}
}
fn, ok := renderFn.(*core.InoxFunction)
if !ok {
if streamable, ok := v.(core.StreamSource); ok {
value = streamable
continue
}
rw.writeHeaders(http.StatusNotFound)
break loop
}
result, err := fn.Call(state, model, nil, nil)
if err != nil {
logger.Print("failed to create new view(): ", err.Error())
rw.writeHeaders(http.StatusInternalServerError)
return
} else {
//TODO: prevent recursion
value = result
continue
}
} else {
if !req.ParsedAcceptHeader.Match(mimeconsts.HTML_CTYPE) {
rw.writeHeaders(http.StatusNotAcceptable)
return
}
//finalize and send headers
rw.SetContentType(mimeconsts.HTML_CTYPE)
cspHeaderValue := core.String(server.defaultCSP.HeaderValue(CSPHeaderValueParams{ScriptsNonce: h.scriptsNonce}))
rw.AddHeader(state.Ctx, CSP_HEADER_NAME, cspHeaderValue)
rw.writeHeaders(statusIfAccepted)
//write body
_, err := core.Render(state.Ctx, rw.DetachBodyWriter(), v, renderingConfig)
if err != nil {
logger.Print(err.Error())
}
}
case core.StreamSource, core.ReadableStream:
if req.AcceptAny() || !req.ParsedAcceptHeader.Match(mimeconsts.EVENT_STREAM_CTYPE) {
rw.writeHeaders(http.StatusNotAcceptable)
return
}
var stream core.ReadableStream
switch s := v.(type) {
case core.ReadableStream:
stream = s
case core.StreamSource:
stream = s.Stream(state.Ctx, nil)
}
if !stream.ChunkDataType().Equal(state.Ctx, core.BYTESLICE_PATTERN, map[uintptr]uintptr{}, 0) {
logger.Print("only byte streams can be streamed for now")
rw.writeHeaders(http.StatusNotAcceptable)
return
}
state.Ctx.PromoteToLongLived()
if err := pushByteStream(stream, h); err != nil {
logger.Print(err)
if !rw.isStatusSent {
rw.writeHeaders(http.StatusInternalServerError) //TODO: cancel context
}
return
}
default:
logger.Printf("routing mapping returned invalid value of type %T : %#v", v, v)
rw.writeHeaders(http.StatusInternalServerError)
}
break
}
}