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router.go
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router.go
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// ⚡️ Fiber is an Express inspired web framework written in Go with ☕️
// 🤖 Github Repository: https://github.com/gofiber/fiber
// 📌 API Documentation: https://docs.gofiber.io
package fiber
import (
"log"
"strings"
"time"
fasthttp "github.com/valyala/fasthttp"
)
func (app *App) next(ctx *Ctx) bool {
// TODO set unique INT within handler(), not here over and over again
method := methodINT[ctx.method]
// Get stack length
lenr := len(app.stack[method]) - 1
// Loop over the layer stack starting from previous index
for ctx.index < lenr {
// Increment stack index
ctx.index++
// Get *Route
layer := app.stack[method][ctx.index]
// Check if it matches the request path
match, values := layer.match(ctx.path)
// No match, continue
if !match {
continue
}
// Pass layer and param values to Ctx
ctx.layer = layer
ctx.values = values
// Execute Ctx handler
layer.Handler(ctx)
// Stop looping the stack
return true
}
return false
}
func (app *App) handler(rctx *fasthttp.RequestCtx) {
// Acquire Ctx with fasthttp request from pool
ctx := AcquireCtx(rctx)
// Attach app poiner to access the routes
ctx.app = app
// Attach fasthttp RequestCtx
ctx.Fasthttp = rctx
// In case sensitive routing, all to lowercase
if !app.Settings.CaseSensitive {
ctx.path = toLower(ctx.path)
}
// Strict routing
if !app.Settings.StrictRouting && len(ctx.path) > 1 && ctx.path[len(ctx.path)-1] == '/' {
ctx.path = trimRight(ctx.path, '/')
}
// Find match in stack
match := app.next(ctx)
// Generate ETag if enabled
if app.Settings.ETag {
setETag(ctx, false)
}
// Send a 404 by default if no layer matched
if !match {
ctx.SendStatus(404)
}
// Release Ctx
ReleaseCtx(ctx)
}
func (app *App) register(method, path string, handlers ...func(*Ctx)) *App {
// A layer requires atleast one ctx handler
if len(handlers) == 0 {
log.Fatalf("Missing handler in route")
}
// Cannot have an empty path
if path == "" {
path = "/"
}
// Path always start with a '/'
if path[0] != '/' {
path = "/" + path
}
// Store original path to strip case sensitive params
original := path
// Case sensitive routing, all to lowercase
if !app.Settings.CaseSensitive {
path = toLower(path)
}
// Strict routing, remove last `/`
if !app.Settings.StrictRouting && len(path) > 1 {
path = trimRight(path, '/')
}
// Is layer a middleware?
var isUse = method == "USE"
// Is path a direct wildcard?
var isStar = path == "/*"
// Is path a root slash?
var isRoot = path == "/"
// Parse path parameters
var isParsed = getParams(original)
// Loop over handlers
for i := range handlers {
// Set layer metadata
layer := &Layer{
// Internals
use: isUse,
star: isStar,
root: isRoot,
parsed: isParsed,
// Externals
Path: path,
Method: method,
Params: isParsed.params,
Handler: handlers[i],
}
// Middleware layer matches all HTTP methods
if isUse {
// Add layer to all HTTP methods stack
for m := range methodINT {
app.addLayer(m, layer)
}
// Skip to next handler
continue
}
// Add layer to stack
app.addLayer(method, layer)
// Also add GET layer to HEAD
if method == MethodGet {
app.addLayer(MethodHead, layer)
}
}
return app
}
func (app *App) registerStatic(prefix, root string, config ...Static) {
// Cannot have an empty prefix
if prefix == "" {
prefix = "/"
}
// Prefix always start with a '/' or '*'
if prefix[0] != '/' {
prefix = "/" + prefix
}
// Match anything
var wildcard = false
if prefix == "*" || prefix == "/*" {
wildcard = true
prefix = "/"
}
// in case sensitive routing, all to lowercase
if !app.Settings.CaseSensitive {
prefix = toLower(prefix)
}
// For security we want to restrict to the current work directory.
if len(root) == 0 {
root = "."
}
// Strip trailing slashes from the root path
if len(root) > 0 && root[len(root)-1] == '/' {
root = root[:len(root)-1]
}
// isSlash ?
var isRoot = prefix == "/"
if strings.Contains(prefix, "*") {
wildcard = true
prefix = strings.Split(prefix, "*")[0]
}
var stripper = len(prefix)
if isRoot {
stripper = 0
}
// Fileserver settings
fs := &fasthttp.FS{
Root: root,
GenerateIndexPages: false,
AcceptByteRange: false,
Compress: false,
CompressedFileSuffix: ".fiber.gz",
CacheDuration: 10 * time.Second,
IndexNames: []string{"index.html"},
PathRewrite: fasthttp.NewPathPrefixStripper(stripper),
PathNotFound: func(ctx *fasthttp.RequestCtx) {
ctx.Response.SetStatusCode(404)
ctx.Response.SetBodyString("Not Found")
},
}
// Set config if provided
if len(config) > 0 {
fs.Compress = config[0].Compress
fs.AcceptByteRange = config[0].ByteRange
fs.GenerateIndexPages = config[0].Browse
if config[0].Index != "" {
fs.IndexNames = []string{config[0].Index}
}
}
fileHandler := fs.NewRequestHandler()
layer := &Layer{
use: true,
root: isRoot,
Method: "*",
Path: prefix,
Handler: func(c *Ctx) {
// Do stuff
if wildcard {
c.Fasthttp.Request.SetRequestURI(prefix)
}
// Serve file
fileHandler(c.Fasthttp)
// Finish request if found and not forbidden
status := c.Fasthttp.Response.StatusCode()
if status != 404 && status != 403 {
return
}
// Reset response
c.Fasthttp.Response.Reset()
// Next middleware
c.Next()
},
}
// Add layer to stack
app.addLayer(MethodGet, layer)
app.addLayer(MethodHead, layer)
}
func (app *App) addLayer(method string, layer *Layer) {
// Get unique HTTP method indentifier
m := methodINT[method]
// Add layer to the stack
app.stack[m] = append(app.stack[m], layer)
}