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api_builder.go
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api_builder.go
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package router
import (
"errors"
"fmt"
"net/http"
"os"
"path"
"reflect"
"strings"
"time"
"github.com/kataras/iris/v12/context"
"github.com/kataras/iris/v12/hero"
"github.com/kataras/iris/v12/macro"
macroHandler "github.com/kataras/iris/v12/macro/handler"
"github.com/kataras/golog"
)
// MethodNone is a Virtual method
// to store the "offline" routes.
const MethodNone = "NONE"
// AllMethods contains the valid HTTP Methods:
// "GET", "POST", "PUT", "DELETE", "CONNECT", "HEAD",
// "PATCH", "OPTIONS", "TRACE".
var AllMethods = []string{
http.MethodGet,
http.MethodHead,
http.MethodPatch,
http.MethodPut,
http.MethodPost,
http.MethodDelete,
http.MethodOptions,
http.MethodConnect,
http.MethodTrace,
}
// RegisterMethods adds custom http methods to the "AllMethods" list.
// Use it on initialization of your program.
func RegisterMethods(newCustomHTTPVerbs ...string) {
newMethods := append(AllMethods, newCustomHTTPVerbs...)
AllMethods = removeDuplicates(newMethods)
}
// repository passed to all parties(subrouters), it's the object witch keeps
// all the routes.
type repository struct {
routes []*Route
paths map[string]*Route // only the fullname path part, required at CreateRoutes for registering index page.
}
func (repo *repository) get(routeName string) *Route {
for _, r := range repo.routes {
if r.Name == routeName {
return r
}
}
return nil
}
func (repo *repository) getRelative(r *Route) *Route {
if r.tmpl.IsTrailing() || !macroHandler.CanMakeHandler(r.tmpl) {
return nil
}
for _, route := range repo.routes {
if r.tmpl.Src == route.tmpl.Src { // No topLink on the same route syntax.
// Fixes #2008, because of APIBuilder.handle, repo.getRelative and repo.register replacement but with a toplink of the old route.
continue
}
if r.Subdomain == route.Subdomain && r.StatusCode == route.StatusCode && r.Method == route.Method &&
r.FormattedPath == route.FormattedPath && !route.tmpl.IsTrailing() {
return route
}
}
return nil
}
func (repo *repository) getByPath(tmplPath string) *Route {
if r, ok := repo.paths[tmplPath]; ok {
return r
}
return nil
}
func (repo *repository) getAll() []*Route {
return repo.routes
}
func (repo *repository) remove(routeName string) bool {
for i, r := range repo.routes {
if r.Name == routeName {
lastIdx := len(repo.routes) - 1
if lastIdx == i {
repo.routes = repo.routes[0:lastIdx]
} else {
cp := make([]*Route, 0, lastIdx)
cp = append(cp, repo.routes[:i]...)
repo.routes = append(cp, repo.routes[i+1:]...)
}
delete(repo.paths, r.tmpl.Src)
return true
}
}
return false
}
func (repo *repository) register(route *Route, rule RouteRegisterRule) (*Route, error) {
for i, r := range repo.routes {
// 14 August 2019 allow register same path pattern with different macro functions,
// see #1058
if route.DeepEqual(r) {
if rule == RouteSkip {
return r, nil
} else if rule == RouteError {
return nil, fmt.Errorf("new route: %s conflicts with an already registered one: %s route", route.String(), r.String())
} else if rule == RouteOverlap {
overlapRoute(r, route)
return route, nil
} else {
// replace existing with the latest one, the default behavior.
repo.routes = append(repo.routes[:i], repo.routes[i+1:]...)
}
break // continue
}
}
repo.routes = append(repo.routes, route)
if route.StatusCode == 0 { // a common resource route, not a status code error handler.
if repo.paths == nil {
repo.paths = make(map[string]*Route)
}
repo.paths[route.tmpl.Src] = route
}
return route, nil
}
var defaultOverlapFilter = func(ctx *context.Context) bool {
if ctx.IsStopped() {
// It's stopped and the response can be overridden by a new handler.
// An exception of compress writer, which does not implement Reseter (and it shouldn't):
rs, ok := ctx.ResponseWriter().(context.ResponseWriterReseter)
return ok && rs.Reset()
}
// It's not stopped, all OK no need to execute the alternative route.
return false
}
func overlapRoute(r *Route, next *Route) {
next.BuildHandlers()
nextHandlers := next.Handlers[0:]
isErrorRoutes := r.StatusCode > 0 && next.StatusCode > 0
decisionHandler := func(ctx *context.Context) {
ctx.Next()
if isErrorRoutes { // fixes issue #1602.
// If it's an error we don't need to reset (see defaultOverlapFilter)
// its status code(!) and its body, we just check if it was proceed or not.
if !ctx.IsStopped() {
return
}
} else {
prevStatusCode := ctx.GetStatusCode()
if !defaultOverlapFilter(ctx) {
return
}
// set the status code that it was stopped with.
// useful for dependencies with StopWithStatus(XXX)
// instead of raw ctx.StopExecution().
// The func_result now also catch the last registered status code
// of the chain, unless the controller returns an integer.
// See _examples/authenticated-controller.
if prevStatusCode > 0 {
// An exception when stored error
// exists and it's type of ErrNotFound.
// Example:
// Version was not found:
// we need to be able to send the status on the last not found version
// but reset the status code if a next available matched version was found.
// see the versioning package.
if !errors.Is(ctx.GetErr(), context.ErrNotFound) {
ctx.StatusCode(prevStatusCode)
}
}
}
ctx.SetErr(nil) // clear any stored error.
// Set the route to the next one and execute it.
ctx.SetCurrentRoute(next.ReadOnly)
ctx.HandlerIndex(0)
ctx.Do(nextHandlers)
}
r.builtinBeginHandlers = append(context.Handlers{decisionHandler}, r.builtinBeginHandlers...)
r.overlappedLink = next
}
// APIBuilder the visible API for constructing the router
// and child routers.
type APIBuilder struct {
// the application logger.
logger *golog.Logger
// parent is the creator of this Party.
// It is nil on Root.
parent *APIBuilder // currently it's not used anywhere.
// the per-party APIBuilder with DI.
apiBuilderDI *APIContainer
// the api builder global macros registry
macros *macro.Macros
// the per-party (and its children) values map
// that may help on building the API
// when source code is splitted between projects.
// Initialized on Properties method.
properties context.Map
// the api builder global routes repository
routes *repository
// disables the debug logging of routes under a per-party and its children.
routesNoLog bool
// the per-party handlers, order
// of handlers registration matters,
// inherited by children unless Reset is called.
middleware context.Handlers
middlewareErrorCode context.Handlers
// the global middleware handlers, order of call doesn't matters, order
// of handlers registration matters. We need a secondary field for this
// because `UseGlobal` registers handlers that should be executed
// even before the `middleware` handlers, and in the same time keep the order
// of handlers registration, so the same type of handlers are being called in order.
beginGlobalHandlers context.Handlers
// the per-party done handlers, order matters.
doneHandlers context.Handlers
// global done handlers, order doesn't matter.
doneGlobalHandlers context.Handlers
// the per-party relative path.
relativePath string
// allowMethods are filled with the `AllowMethods` method.
// They are used to create new routes
// per any party's (and its children) routes registered
// if the method "x" wasn't registered already via the `Handle` (and its extensions like `Get`, `Post`...).
allowMethods []string
// the per-party (and its children) execution rules for begin, main and done handlers.
handlerExecutionRules ExecutionRules
// the per-party (and its children) route registration rule, see `SetRegisterRule`.
routeRegisterRule RouteRegisterRule
// routerFilterHandlers holds a reference
// of the handlers used by the current and its parent Party's registered
// router filters. Inherited by children unless `Reset` (see `UseRouter`),
routerFilterHandlers context.Handlers
// routerFilters field is shared across Parties. Each Party registers
// one or more middlewares to run before the router itself using the `UseRouter` method.
// Each Party calls the shared filter (`partyMatcher`) that decides if its `UseRouter` handlers
// can be executed. By default it's based on party's static path and/or subdomain,
// it can be modified through an `Application.SetPartyMatcher` call
// once before or after routerFilters filled.
//
// The Key is the Party (instance of APIBuilder),
// value wraps the partyFilter + the handlers registered through `UseRouter`.
// See `GetRouterFilters` too.
routerFilters map[Party]*Filter
// partyMatcher field is shared across all Parties,
// can be modified through the Application level only.
//
// It defaults to the internal, simple, "defaultPartyMatcher".
// It applies when "routerFilters" are used.
partyMatcher PartyMatcherFunc
}
var (
_ Party = (*APIBuilder)(nil)
_ PartyMatcher = (*APIBuilder)(nil)
_ RoutesProvider = (*APIBuilder)(nil) // passed to the default request handler (routerHandler)
)
// NewAPIBuilder creates & returns a new builder
// which is responsible to build the API and the router handler.
func NewAPIBuilder(logger *golog.Logger) *APIBuilder {
return &APIBuilder{
logger: logger,
parent: nil,
macros: macro.Defaults,
relativePath: "/",
routes: new(repository),
apiBuilderDI: &APIContainer{Container: hero.New().WithLogger(logger)},
routerFilters: make(map[Party]*Filter),
partyMatcher: defaultPartyMatcher,
}
}
// Logger returns the Application Logger.
func (api *APIBuilder) Logger() *golog.Logger {
return api.logger
}
// IsRoot reports whether this Party is the root Application's one.
// It will return false on all children Parties, no exception.
func (api *APIBuilder) IsRoot() bool {
return api.parent == nil
}
/* If requested:
// GetRoot returns the very first Party (the Application).
func (api *APIBuilder) GetRoot() *APIBuilder {
root := api.parent
for root != nil {
root = api.parent
}
return root
}*/
// ConfigureContainer accepts one or more functions that can be used
// to configure dependency injection features of this Party
// such as register dependency and register handlers that will automatically inject any valid dependency.
// However, if the "builder" parameter is nil or not provided then it just returns the *APIContainer,
// which automatically initialized on Party allocation.
//
// It returns the same `APIBuilder` featured with Dependency Injection.
func (api *APIBuilder) ConfigureContainer(builder ...func(*APIContainer)) *APIContainer {
if api.apiBuilderDI.Self == nil {
api.apiBuilderDI.Self = api
}
for _, b := range builder {
if b != nil {
b(api.apiBuilderDI)
}
}
return api.apiBuilderDI
}
// EnsureStaticBindings panics on struct handler (controller)
// if at least one input binding depends on the request and not in a static structure.
// Should be called before `RegisterDependency`.
func (api *APIBuilder) EnsureStaticBindings() Party {
diContainer := api.ConfigureContainer()
diContainer.Container.DisableStructDynamicBindings = true
return api
}
// RegisterDependency calls the `ConfigureContainer.RegisterDependency` method
// with the provided value(s). See `HandleFunc` and `PartyConfigure` methods too.
func (api *APIBuilder) RegisterDependency(dependencies ...interface{}) {
diContainer := api.ConfigureContainer()
for i, dependency := range dependencies {
if dependency == nil {
api.logger.Warnf("Party: %s: nil dependency on position: %d", api.relativePath, i)
continue
}
diContainer.RegisterDependency(dependency)
}
}
// HandleFunc registers a route on HTTP verb "method" and relative, to this Party, path.
// It is like the `Handle` method but it accepts one or more "handlersFn" functions
// that each one of them can accept any input arguments as the HTTP request and
// output a result as the HTTP response. Specifically,
// the input of the "handlersFn" can be any registered dependency
// (see ConfigureContainer().RegisterDependency)
// or leave the framework to parse the request and fill the values accordingly.
// The output of the "handlersFn" can be any output result:
//
// custom structs <T>, string, []byte, int, error,
// a combination of the above, hero.Result(hero.View | hero.Response) and more.
//
// If more than one handler function is registered
// then the execution happens without the nessecity of the `Context.Next` method,
// simply, to stop the execution and not continue to the next "handlersFn" in chain
// you should return an `iris.ErrStopExecution`.
//
// Example Code:
//
// The client's request body and server's response body Go types.
// Could be any data structure.
//
// type (
// request struct {
// Firstname string `json:"firstname"`
// Lastname string `json:"lastname"`
// }
//
// response struct {
// ID uint64 `json:"id"`
// Message string `json:"message"`
// }
// )
//
// Register the route hander.
//
// HTTP VERB ROUTE PATH ROUTE HANDLER
// app.HandleFunc("PUT", "/users/{id:uint64}", updateUser)
//
// Code the route handler function.
// Path parameters and request body are binded
// automatically.
// The "id" uint64 binds to "{id:uint64}" route path parameter and
// the "input" binds to client request data such as JSON.
//
// func updateUser(id uint64, input request) response {
// // [custom logic...]
//
// return response{
// ID:id,
// Message: "User updated successfully",
// }
// }
//
// Simulate a client request which sends data
// to the server and prints out the response.
//
// curl --request PUT -d '{"firstname":"John","lastname":"Doe"}' \
// -H "Content-Type: application/json" \
// http://localhost:8080/users/42
//
// {
// "id": 42,
// "message": "User updated successfully"
// }
//
// See the `ConfigureContainer` for more features regrading
// the dependency injection, mvc and function handlers.
//
// This method is just a shortcut of the `ConfigureContainer().Handle`.
func (api *APIBuilder) HandleFunc(method, relativePath string, handlersFn ...interface{}) *Route {
return api.ConfigureContainer().Handle(method, relativePath, handlersFn...)
}
// UseFunc registers a function which can accept one or more
// dependencies (see RegisterDependency) and returns an iris.Handler
// or a result of <T> and/or an error.
//
// This method is just a shortcut of the `ConfigureContainer().Use`.
func (api *APIBuilder) UseFunc(handlersFn ...interface{}) {
api.ConfigureContainer().Use(handlersFn...)
}
// GetRelPath returns the current party's relative path.
// i.e:
// if r := app.Party("/users"), then the `r.GetRelPath()` is the "/users".
// if r := app.Party("www.") or app.Subdomain("www") then the `r.GetRelPath()` is the "www.".
func (api *APIBuilder) GetRelPath() string {
return api.relativePath
}
// AllowMethods will re-register the future routes that will be registered
// via `Handle`, `Get`, `Post`, ... to the given "methods" on that Party and its children "Parties",
// duplicates are not registered.
//
// Call of `AllowMethod` will override any previous allow methods.
func (api *APIBuilder) AllowMethods(methods ...string) Party {
api.allowMethods = methods
return api
}
// SetExecutionRules alters the execution flow of the route handlers outside of the handlers themselves.
//
// For example, if for some reason the desired result is the (done or all) handlers to be executed no matter what
// even if no `ctx.Next()` is called in the previous handlers, including the begin(`Use`),
// the main(`Handle`) and the done(`Done`) handlers themselves, then:
//
// Party#SetExecutionRules(iris.ExecutionRules {
// Begin: iris.ExecutionOptions{Force: true},
// Main: iris.ExecutionOptions{Force: true},
// Done: iris.ExecutionOptions{Force: true},
// })
//
// Note that if : true then the only remained way to "break" the handler chain is by `ctx.StopExecution()` now that `ctx.Next()` does not matter.
//
// These rules are per-party, so if a `Party` creates a child one then the same rules will be applied to that as well.
// Reset of these rules (before `Party#Handle`) can be done with `Party#SetExecutionRules(iris.ExecutionRules{})`.
//
// The most common scenario for its use can be found inside Iris MVC Applications;
// when we want the `Done` handlers of that specific mvc app's `Party`
// to be executed but we don't want to add `ctx.Next()` on the `OurController#EndRequest`.
//
// Returns this Party.
//
// Example: https://github.com/kataras/iris/tree/main/_examples/mvc/middleware/without-ctx-next
func (api *APIBuilder) SetExecutionRules(executionRules ExecutionRules) Party {
api.handlerExecutionRules = executionRules
return api
}
// RouteRegisterRule is a type of uint8.
// Defines the register rule for new routes that already exists.
// Available values are: RouteOverride, RouteSkip and RouteError.
//
// See `Party#SetRegisterRule`.
type RouteRegisterRule uint8
const (
// RouteOverride replaces an existing route with the new one, the default rule.
RouteOverride RouteRegisterRule = iota
// RouteSkip keeps the original route and skips the new one.
RouteSkip
// RouteError log when a route already exists, shown after the `Build` state,
// server never starts.
RouteError
// RouteOverlap will overlap the new route to the previous one.
// If the route stopped and its response can be reset then the new route will be execute.
RouteOverlap
)
// SetRegisterRule sets a `RouteRegisterRule` for this Party and its children.
// Available values are:
// * RouteOverride (the default one)
// * RouteSkip
// * RouteError
// * RouteOverlap.
func (api *APIBuilder) SetRegisterRule(rule RouteRegisterRule) Party {
api.routeRegisterRule = rule
return api
}
// Handle registers a route to this Party.
// if empty method is passed then handler(s) are being registered to all methods, same as .Any.
//
// Returns a *Route, app will throw any errors later on.
func (api *APIBuilder) Handle(method string, relativePath string, handlers ...context.Handler) *Route {
return api.handle(0, method, relativePath, handlers...)
}
// handle registers a full route to this Party.
// Use Handle or Get, Post, Put, Delete and et.c. instead.
func (api *APIBuilder) handle(errorCode int, method string, relativePath string, handlers ...context.Handler) *Route {
routes := api.createRoutes(errorCode, []string{method}, relativePath, handlers...)
var route *Route // the last one is returned.
var err error
for _, route = range routes {
if route == nil {
continue
}
// global
route.topLink = api.routes.getRelative(route)
if route, err = api.routes.register(route, api.routeRegisterRule); err != nil {
api.logger.Error(err)
break
}
}
return route
}
// HandleMany works like `Handle` but can receive more than one
// paths separated by spaces and returns always a slice of *Route instead of a single instance of Route.
//
// It's useful only if the same handler can handle more than one request paths,
// otherwise use `Party` which can handle many paths with different handlers and middlewares.
//
// Usage:
//
// app.HandleMany("GET", "/user /user/{id:uint64} /user/me", genericUserHandler)
//
// At the other side, with `Handle` we've had to write:
//
// app.Handle("GET", "/user", userHandler)
// app.Handle("GET", "/user/{id:uint64}", userByIDHandler)
// app.Handle("GET", "/user/me", userMeHandler)
//
// app.HandleMany("GET POST", "/path", handler)
func (api *APIBuilder) HandleMany(methodOrMulti string, relativePathorMulti string, handlers ...context.Handler) (routes []*Route) {
// at least slash
// a space
// at least one other slash for the next path
paths := splitPath(relativePathorMulti)
methods := splitMethod(methodOrMulti)
for _, p := range paths {
if p != "" {
for _, method := range methods {
if method == "" {
method = "ANY"
}
if method == "ANY" || method == "ALL" {
routes = append(routes, api.Any(p, handlers...)...)
continue
}
routes = append(routes, api.Handle(method, p, handlers...))
}
}
}
return
}
// HandleDir registers a handler that serves HTTP requests
// with the contents of a file system (physical or embedded).
//
// first parameter : the route path
// second parameter : the file system needs to be served
// third parameter : not required, the serve directory options.
//
// Alternatively, to get just the handler for that look the FileServer function instead.
//
// api.HandleDir("/static", iris.Dir("./assets"), iris.DirOptions{IndexName: "/index.html", Compress: true})
//
// Returns all the registered routes, including GET index and path patterm and HEAD.
//
// Usage:
// HandleDir("/public", "./assets", DirOptions{...}) or
// HandleDir("/public", iris.Dir("./assets"), DirOptions{...})
// OR
// //go:embed assets/*
// var filesystem embed.FS
// HandleDir("/public",filesystem, DirOptions{...})
// OR to pick a specific folder of the embedded filesystem:
// import "io/fs"
// subFilesystem, err := fs.Sub(filesystem, "assets")
// HandleDir("/public",subFilesystem, DirOptions{...})
//
// Examples:
// https://github.com/kataras/iris/tree/main/_examples/file-server
func (api *APIBuilder) HandleDir(requestPath string, fsOrDir interface{}, opts ...DirOptions) (routes []*Route) {
options := DefaultDirOptions
if len(opts) > 0 {
options = opts[0]
}
fs := context.ResolveHTTPFS(fsOrDir)
h := FileServer(fs, options)
description := "file server"
if d, ok := fs.(http.Dir); ok {
description = string(d)
}
fileName, lineNumber := context.HandlerFileLine(h) // take those before StripPrefix.
// if subdomain, we get the full path of the path only,
// because a subdomain can have parties as well
// and we need that path to call the `StripPrefix`.
_, fullpath := splitSubdomainAndPath(joinPath(api.relativePath, requestPath))
if fullpath != "/" {
h = StripPrefix(fullpath, h)
}
if api.GetRouteByPath(fullpath) == nil {
// register index if not registered by the end-developer.
routes = api.CreateRoutes([]string{http.MethodGet, http.MethodHead}, requestPath, h)
}
requestPath = joinPath(requestPath, WildcardFileParam())
routes = append(routes, api.CreateRoutes([]string{http.MethodGet, http.MethodHead}, requestPath, h)...)
for _, route := range routes {
if route.Method == http.MethodHead {
} else {
route.Describe(description)
route.SetSourceLine(fileName, lineNumber)
}
if _, err := api.routes.register(route, api.routeRegisterRule); err != nil {
api.logger.Error(err)
break
}
}
return routes
}
// CreateRoutes returns a list of Party-based Routes.
// It does NOT registers the route. Use `Handle, Get...` methods instead.
// This method can be used for third-parties Iris helpers packages and tools
// that want a more detailed view of Party-based Routes before take the decision to register them.
func (api *APIBuilder) CreateRoutes(methods []string, relativePath string, handlers ...context.Handler) []*Route {
return api.createRoutes(0, methods, relativePath, handlers...)
}
// RemoveRoute deletes a registered route by its name before `Application.Listen`.
// The default naming for newly created routes is: method + subdomain + path.
// Reports whether a route with that name was found and removed successfully.
//
// Note that this method applies to all Parties (sub routers)
// even if each of the Parties have access to this method,
// as the route name is unique per Iris Application.
func (api *APIBuilder) RemoveRoute(routeName string) bool {
return api.routes.remove(routeName)
}
func (api *APIBuilder) createRoutes(errorCode int, methods []string, relativePath string, handlers ...context.Handler) []*Route {
if statusCodeSuccessful(errorCode) {
errorCode = 0
}
if errorCode == 0 {
if len(methods) == 0 || methods[0] == "ALL" || methods[0] == "ANY" { // then use like it was .Any
return api.Any(relativePath, handlers...)
}
}
// no clean path yet because of subdomain indicator/separator which contains a dot.
// but remove the first slash if the relative has already ending with a slash
// it's not needed because later on we do normalize/clean the path, but better do it here too
// for any future updates.
if api.relativePath[len(api.relativePath)-1] == '/' {
if relativePath[0] == '/' {
relativePath = relativePath[1:]
}
}
filename, line := hero.GetCaller()
fullpath := api.relativePath + relativePath // for now, keep the last "/" if any, "/xyz/"
if len(handlers) == 0 {
api.logger.Errorf("missing handlers for route[%s:%d] %s: %s", filename, line, strings.Join(methods, ", "), fullpath)
return nil
}
// note: this can not change the caller's handlers as they're but the entry values(handlers)
// of `middleware`, `doneHandlers` and `handlers` can.
// So if we just put `api.middleware` or `api.doneHandlers`
// then the next `Party` will have those updated handlers
// but dev may change the rules for that child Party, so we have to make clones of them here.
var (
// global middleware to error handlers as well.
beginHandlers = api.beginGlobalHandlers
doneHandlers = api.doneGlobalHandlers
)
if errorCode == 0 {
beginHandlers = context.JoinHandlers(beginHandlers, api.middleware)
doneHandlers = context.JoinHandlers(doneHandlers, api.doneHandlers)
} else {
beginHandlers = context.JoinHandlers(beginHandlers, api.middlewareErrorCode)
}
mainHandlers := context.Handlers(handlers)
// before join the middleware + handlers + done handlers and apply the execution rules.
mainHandlerName, mainHandlerIndex := context.MainHandlerName(mainHandlers)
mainHandlerFileName, mainHandlerFileNumber := context.HandlerFileLineRel(handlers[mainHandlerIndex])
// re-calculate mainHandlerIndex in favor of the middlewares.
mainHandlerIndex = len(beginHandlers) + mainHandlerIndex
// TODO: for UseGlobal/DoneGlobal that doesn't work.
applyExecutionRules(api.handlerExecutionRules, &beginHandlers, &doneHandlers, &mainHandlers)
// global begin handlers -> middleware that are registered before route registration
// -> handlers that are passed to this Handle function.
routeHandlers := context.JoinHandlers(beginHandlers, mainHandlers)
// -> done handlers
routeHandlers = context.JoinHandlers(routeHandlers, doneHandlers)
// here we separate the subdomain and relative path
subdomain, path := splitSubdomainAndPath(fullpath)
// if allowMethods are empty, then simply register with the passed, main, method.
methods = removeDuplicates(append(api.allowMethods, methods...))
routes := make([]*Route, len(methods))
for i, m := range methods { // single, empty method for error handlers.
route, err := NewRoute(api, errorCode, m, subdomain, path, routeHandlers, *api.macros)
if err != nil { // template path parser errors:
api.logger.Errorf("[%s:%d] %v -> %s:%s:%s", filename, line, err, m, subdomain, path)
continue
}
// The caller tiself, if anonymous, it's the first line of `app.X("/path", here)`
route.RegisterFileName = mainHandlerFileName // filename
route.RegisterLineNumber = mainHandlerFileNumber // line
route.MainHandlerName = mainHandlerName
route.MainHandlerIndex = mainHandlerIndex
// The main handler source, could be the same as the register's if anonymous.
route.SourceFileName = mainHandlerFileName
route.SourceLineNumber = mainHandlerFileNumber
// Add UseGlobal & DoneGlobal Handlers
// route.Use(api.beginGlobalHandlers...)
// route.Done(api.doneGlobalHandlers...)
route.NoLog = api.routesNoLog
routes[i] = route
}
return routes
}
func removeDuplicates(elements []string) (result []string) {
seen := make(map[string]struct{})
for v := range elements {
val := elements[v]
if _, ok := seen[val]; !ok {
seen[val] = struct{}{}
result = append(result, val)
}
}
return result
}
// Party returns a new child Party which inherites its
// parent's options and middlewares.
// A Party groups routes which may have the same prefix or subdomain and share same middlewares.
//
// To create a group of routes for subdomains
// use the `Subdomain` or `WildcardSubdomain` methods
// or pass a "relativePath" of "admin." or "*." respectfully.
func (api *APIBuilder) Party(relativePath string, handlers ...context.Handler) Party {
// if app.Party("/"), root party or app.Party("/user") == app.Party("/user")
// then just add the middlewares and return itself.
// if relativePath == "" || api.relativePath == relativePath {
// api.Use(handlers...)
// return api
// }
// ^ No, this is wrong, let the developer do its job, if she/he wants a copy let have it,
// it's a pure check as well, a path can be the same even if it's the same as its parent, i.e.
// app.Party("/user").Party("/user") should result in a /user/user, not a /user.
parentPath := api.relativePath
dot := string(SubdomainPrefix[0])
if len(parentPath) > 0 && parentPath[0] == '/' && strings.HasSuffix(relativePath, dot) {
// if ends with . , i.e admin., it's subdomain->
parentPath = parentPath[1:] // remove first slash
}
// this is checked later on but for easier debug is better to do it here:
if api.relativePath[len(api.relativePath)-1] == '/' && relativePath[0] == '/' {
relativePath = relativePath[1:] // remove first slash if parent ended with / and new one started with /.
}
// if it's subdomain then it has priority, i.e:
// api.relativePath == "admin."
// relativePath == "panel."
// then it should be panel.admin.
// instead of admin.panel.
if hasSubdomain(parentPath) && hasSubdomain(relativePath) {
relativePath = relativePath + parentPath
parentPath = ""
}
fullpath := parentPath + relativePath
// append the parent's + child's handlers
middleware := context.JoinHandlers(api.middleware, handlers)
// the allow methods per party and its children.
allowMethods := make([]string, len(api.allowMethods))
copy(allowMethods, api.allowMethods)
// make a copy of the parent properties.
properties := make(context.Map, len(api.properties))
for k, v := range api.properties {
properties[k] = v
}
childAPI := &APIBuilder{
// global/api builder
logger: api.logger,
macros: api.macros,
properties: properties,
routes: api.routes,
routesNoLog: api.routesNoLog,
beginGlobalHandlers: api.beginGlobalHandlers,
doneGlobalHandlers: api.doneGlobalHandlers,
// per-party/children
parent: api,
middleware: middleware,
middlewareErrorCode: context.JoinHandlers(api.middlewareErrorCode, context.Handlers{}),
doneHandlers: api.doneHandlers[0:],
routerFilters: api.routerFilters,
routerFilterHandlers: api.routerFilterHandlers,
partyMatcher: api.partyMatcher,
relativePath: fullpath,
allowMethods: allowMethods,
handlerExecutionRules: api.handlerExecutionRules,
routeRegisterRule: api.routeRegisterRule,
apiBuilderDI: &APIContainer{
// attach a new Container with correct dynamic path parameter start index for input arguments
// based on the fullpath.
Container: api.apiBuilderDI.Container.Clone(),
},
}
return childAPI
}
// PartyFunc same as `Party`, groups routes that share a base path or/and same handlers.
// However this function accepts a function that receives this created Party instead.
// Returns the Party in order the caller to be able to use this created Party to continue the
// top-bottom routes "tree".
//
// Note: `iris#Party` and `core/router#Party` describes the exactly same interface.
//
// Usage:
//
// app.PartyFunc("/users", func(u iris.Party){
// u.Use(authMiddleware, logMiddleware)
// u.Get("/", getAllUsers)
// u.Post("/", createOrUpdateUser)
// u.Delete("/", deleteUser)
// })
//
// Look `Party` for more.
func (api *APIBuilder) PartyFunc(relativePath string, partyBuilderFunc func(p Party)) Party {
p := api.Party(relativePath)
partyBuilderFunc(p)
return p
}
type (
// PartyConfigurator is an interface which all child parties that are registered
// through `PartyConfigure` should implement.
PartyConfigurator interface {
Configure(parent Party)
}
// StrictlyPartyConfigurator is an optional interface which a `PartyConfigurator`
// can implement to make sure that all exported fields having a not-nin, non-zero
// value before server starts.
// StrictlyPartyConfigurator interface {
// Strict() bool
// }
// Good idea but a `mvc or bind:"required"` is a better one I think.
)
// PartyConfigure like `Party` and `PartyFunc` registers a new children Party
// but instead it accepts a struct value which should implement the PartyConfigurator interface.
//
// PartyConfigure accepts the relative path of the child party
// (As an exception, if it's empty then all configurators are applied to the current Party)
// and one or more Party configurators and
// executes the PartyConfigurator's Configure method.
//
// If the end-developer registered one or more dependencies upfront through
// RegisterDependencies or ConfigureContainer.RegisterDependency methods
// and "p" is a pointer to a struct then try to bind the unset/zero exported fields
// to the registered dependencies, just like we do with Controllers.
// Useful when the api's dependencies amount are too much to pass on a function.
//
// Usage:
//
// app.PartyConfigure("/users", &api.UsersAPI{UserRepository: ..., ...})
//
// Where UsersAPI looks like:
//
// type UsersAPI struct { [...] }
// func(api *UsersAPI) Configure(router iris.Party) {
// router.Get("/{id:uuid}", api.getUser)
// [...]
// }
//
// Usage with (static) dependencies:
//
// app.RegisterDependency(userRepo, ...)
// app.PartyConfigure("/users", new(api.UsersAPI))
func (api *APIBuilder) PartyConfigure(relativePath string, partyReg ...PartyConfigurator) Party {
var child Party
if relativePath == "" {
child = api
} else {
child = api.Party(relativePath)
}
for _, p := range partyReg {
if p == nil {
continue
}
if len(api.apiBuilderDI.Container.Dependencies) > 0 {
if typ := reflect.TypeOf(p); typ.Kind() == reflect.Ptr && typ.Elem().Kind() == reflect.Struct {
api.apiBuilderDI.Container.Struct(p, -1)
}
}
p.Configure(child)
}
return child
}