add middleware (same principle as types) + scope check in progress

config/method.go

@@ -1 +1,17 @@
 package config
+
+import (
+	"fmt"
+	"git.xdrm.io/go/aicra/middleware"
+)
+
+// CheckScope returns whether a given scope matches the
+// method configuration
+//
+// format is: [ [a,b], [c], [d,e] ]
+// > level 1 is OR
+// > level 2 is AND
+func (m *Method) CheckScope(scope middleware.Scope) bool {
+	fmt.Printf("Scope: %v\n", m.Permission)
+	return false
+}

middleware/public.go

@@ -0,0 +1,110 @@
+package middleware
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"plugin"
+	"strings"
+)
+
+// CreateRegistry creates an empty middleware registry
+// - if loadDir is set -> load all available middlewares
+//   inside the local ./middleware folder
+func CreateRegistry(loadDir ...string) *MiddlewareRegistry {
+
+	/* (1) Create registry */
+	reg := &MiddlewareRegistry{
+		Middlewares: make([]MiddleWare, 0),
+	}
+
+	/* (2) If no default to use -> empty registry */
+	if len(loadDir) < 1 {
+		return reg
+	}
+
+	/* (3) List types */
+	plugins, err := ioutil.ReadDir(loadDir[0])
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	/* (4) Else try to load each given default */
+	for _, file := range plugins {
+
+		// ignore non .so files
+		if !strings.HasSuffix(file.Name(), ".so") {
+			continue
+		}
+
+		err := reg.Add(file.Name())
+		if err != nil {
+			log.Fatalf("Cannot load plugin '%s'", file.Name())
+		}
+
+	}
+
+	return reg
+}
+
+// Add adds a middleware to the registry; it must be a
+// valid and existing plugin name with or without the .so extension
+// it must be located in the relative directory .build/middleware
+func (tr *MiddlewareRegistry) Add(pluginName string) error {
+
+	/* (1) Check plugin name */
+	if len(pluginName) < 1 {
+		return fmt.Errorf("Plugin name must not be empty")
+	}
+
+	/* (2) Check if valid plugin name */
+	if strings.ContainsAny(pluginName, "/") {
+		return fmt.Errorf("'%s' can only be a name, not a path", pluginName)
+	}
+
+	/* (3) Check plugin extension */
+	if !strings.HasSuffix(pluginName, ".so") {
+		pluginName = fmt.Sprintf("%s.so", pluginName)
+	}
+
+	/* (4) Try to load the plugin */
+	p, err := plugin.Open(fmt.Sprintf(".build/middleware/%s", pluginName))
+	if err != nil {
+		return err
+	}
+
+	/* (5) Export wanted properties */
+	inspect, err := p.Lookup("Inspect")
+	if err != nil {
+		return fmt.Errorf("Missing method 'Inspect()'; %s", err)
+	}
+
+	/* (6) Cast Inspect */
+	inspectCast, ok := inspect.(func(http.Request, Scope))
+	if !ok {
+		return fmt.Errorf("Inspect() is malformed")
+	}
+
+	/* (7) Add type to registry */
+	tr.Middlewares = append(tr.Middlewares, MiddleWare{
+		Inspect: inspectCast,
+	})
+
+	return nil
+}
+
+// Runs all middlewares (default browse order)
+func (mr MiddlewareRegistry) Run(req http.Request) Scope {
+
+	/* (1) Initialise scope */
+	scope := Scope{}
+
+	/* (2) Execute each middleware */
+	for _, m := range mr.Middlewares {
+		m.Inspect(req, scope)
+	}
+
+	return scope
+
+}

middleware/types.go

@@ -0,0 +1,26 @@
+package middleware
+
+import (
+	"net/http"
+)
+
+// Scope represents a list of scope processed by middlewares
+// and used by the router to block/allow some uris
+// it is also passed to controllers
+type Scope []string
+
+// Inspector updates the @Scope passed to it according to
+// the @http.Request
+type Inspector func(http.Request, Scope)
+
+// Middleware contains all necessary methods
+// for a Middleware provided by user/developer
+type MiddleWare struct {
+	Inspect func(http.Request, Scope)
+}
+
+// MiddlewareRegistry represents a registry containing all registered
+// middlewares to be processed before routing any request
+type MiddlewareRegistry struct {
+	Middlewares []MiddleWare
+}

server.go

@@ -6,16 +6,15 @@ import (
 	"git.xdrm.io/go/aicra/config"
 	e "git.xdrm.io/go/aicra/err"
 	"git.xdrm.io/go/aicra/implement"
+	"git.xdrm.io/go/aicra/middleware"
 	"git.xdrm.io/go/aicra/request"
 	"log"
 	"net/http"
 )
 
 // Init initilises a new framework instance
-// - path is the configuration path
+// - path is the configuration file
-// - if typeChecker is nil, defaults will be used (all *.so files
+func New(path string) (*Server, error) {
-//   inside ./.build/types local directory)
-func Init(path string, typeChecker ...*checker.TypeRegistry) (*Server, error) {
 
 	/* (1) Init instance */
 	inst := &Server{
@@ -30,20 +29,30 @@ func Init(path string, typeChecker ...*checker.TypeRegistry) (*Server, error) {
 	}
 	inst.config = config
 
-	/* (3) Store registry if given */
+	/* (3) Default type registry */
-	if len(typeChecker) > 0 && typeChecker[0] != nil {
+	inst.SetTypeFolder(".build/type")
-		inst.Checker = typeChecker[0]
-		return inst, nil
-	}
 
-	/* (4) Default registry creation */
+	/* (4) Default middleware registry */
-	inst.Checker = checker.CreateRegistry(".build/type")
+	inst.SetMiddlewareFolder(".build/middleware")
 
 	return inst, nil
+
+}
+
+// Create the type (checker) registry from
+// a given folder
+func (s *Server) SetTypeFolder(path string) {
+	s.Checker = checker.CreateRegistry(path)
+}
+
+// Create the middleware registry from
+// a given folder
+func (s *Server) SetMiddlewareFolder(path string) {
+	s.Middleware = middleware.CreateRegistry(path)
 }
 
 // Listens and binds the server to the given port
-func (s *Server) Launch(port uint16) error {
+func (s *Server) Listen(port uint16) error {
 
 	/* (1) Bind router */
 	http.HandleFunc("/", s.routeRequest)
@@ -63,10 +72,13 @@ func (s *Server) routeRequest(res http.ResponseWriter, httpReq *http.Request) {
 	}
 
 	/* (2) Middleware: authentication */
-	// TODO: Auth
+	scope := s.Middleware.Run(*httpReq)
 
 	/* (3) Find a matching controller */
 	controller := s.findController(req)
+	if controller == nil {
+		return
+	}
 
 	/* (4) Check if matching method exists */
 	var method = controller.Method(httpReq.Method)
@@ -76,6 +88,12 @@ func (s *Server) routeRequest(res http.ResponseWriter, httpReq *http.Request) {
 		return
 	}
 
+	/* (5) Check scope permissions */
+	if !method.CheckScope(scope) {
+		httpError(res, e.Permission)
+		return
+	}
+
 	/* (4) Check parameters
 	---------------------------------------------------------*/
 	parameters, paramError := s.ExtractParameters(req, method.Parameters)
@@ -96,16 +114,19 @@ func (s *Server) routeRequest(res http.ResponseWriter, httpReq *http.Request) {
 
 	/* (6) Execute and get response
 	---------------------------------------------------------*/
-	/* (1) Show Authorization header into controller */
+	/* (1) Give Authorization header into controller */
 	authHeader := httpReq.Header.Get("Authorization")
 	if len(authHeader) > 0 {
 		parameters["_AUTHORIZATION_"] = authHeader
 	}
 
-	/* (2) Execute */
+	/* (2) Give Scope into controller */
+	parameters["_SCOPE_"] = scope
+
+	/* (3) Execute */
 	response := callable(parameters, implement.NewResponse())
 
-	/* (3) Extract http headers */
+	/* (4) Extract http headers */
 	for k, v := range response.Dump() {
 		if k == "_REDIRECT_" {
 			if newLocation, ok := v.(string); ok {
@@ -115,7 +136,7 @@ func (s *Server) routeRequest(res http.ResponseWriter, httpReq *http.Request) {
 		}
 	}
 
-	/* (4) Build JSON response */
+	/* (5) Build JSON response */
 	httpPrint(res, response)
 	return
 

types.go

@@ -3,10 +3,12 @@ package aicra
 import (
 	"git.xdrm.io/go/aicra/checker"
 	"git.xdrm.io/go/aicra/config"
+	"git.xdrm.io/go/aicra/middleware"
 )
 
 type Server struct {
 	config     *config.Controller
 	Params     map[string]interface{}
 	Checker    *checker.TypeRegistry          // type check
+	Middleware *middleware.MiddlewareRegistry // middlewares
 }