mirror of https://github.com/harness/drone.git
123 lines
3.6 KiB
Go
123 lines
3.6 KiB
Go
// Copyright 2023 Harness, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package dist embeds the static web server content.
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package web
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import (
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"bytes"
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"embed"
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"io"
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"io/fs"
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"net/http"
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"os"
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"path"
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"path/filepath"
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"strings"
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"time"
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"github.com/rs/zerolog/log"
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)
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//go:embed dist/*
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var UI embed.FS
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// Handler returns an http.HandlerFunc that servers the
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// static content from the embedded file system.
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//
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//nolint:gocognit // refactor if required.
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func Handler() http.HandlerFunc {
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// Load the files subdirectory
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fs, err := fs.Sub(UI, "dist")
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if err != nil {
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panic(err)
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}
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// Create an http.FileServer to serve the
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// contents of the files subdiretory.
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handler := http.FileServer(http.FS(fs))
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// Create an http.HandlerFunc that wraps the
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// http.FileServer to always load the index.html
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// file if a directory path is being requested.
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// because this is a single page application,
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// we need to always load the index.html file
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// in the root of the project, unless the path
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// points to a file with an extension (css, js, etc)
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// No ext: (1) a browser URL request, not a static asset request
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if filepath.Ext(r.URL.Path) == "" ||
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// "..." : (2a) browser URL with ... in it
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(strings.Contains(r.URL.Path, "...") &&
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// (2b) filter out static asset URLs that browsers make along with it
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filepath.Ext(strings.ReplaceAll(r.URL.Path, "...", "")) == "") {
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// HACK: alter the path to point to the
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// root of the project.
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r.URL.Path = "/"
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} else {
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// All static assets are served from the root path
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r.URL.Path = "/" + path.Base(r.URL.Path)
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}
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// Disable caching and sniffing via HTTP headers for UI main entry resources
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if r.URL.Path == "/" || r.URL.Path == "/remoteEntry.js" || r.URL.Path == "/index.html" {
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w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate, max-age=0")
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w.Header().Set("pragma", "no-cache")
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w.Header().Set("X-Content-Type-Options", "nosniff")
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}
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if r.URL.Path == "/remoteEntry.js" {
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if readerRemoteEntry, errFetch := fetchRemoteEntryJS(fs); errFetch == nil {
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http.ServeContent(w, r, r.URL.Path, time.Now(), readerRemoteEntry)
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} else {
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log.Error().Msgf("Failed to fetch remoteEntry.js %v", err)
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http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
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}
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} else {
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// and finally serve the file.
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handler.ServeHTTP(w, r)
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}
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})
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}
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var remoteEntryContent *bytes.Reader
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func fetchRemoteEntryJS(fs fs.FS) (*bytes.Reader, error) {
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if remoteEntryContent == nil {
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path := "remoteEntry.js"
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file, err := fs.Open(path)
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if err != nil {
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log.Error().Msgf("Failed to open file %v", path)
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return nil, err
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}
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buf, err := io.ReadAll(file)
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if err != nil {
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log.Error().Msgf("Failed to read file %v", path)
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return nil, err
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}
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enableCDN := os.Getenv("ENABLE_CDN")
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if len(enableCDN) == 0 {
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enableCDN = "false"
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}
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modBuf := bytes.Replace(buf, []byte("__ENABLE_CDN__"), []byte(enableCDN), 1)
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remoteEntryContent = bytes.NewReader(modBuf)
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}
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return remoteEntryContent, nil
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}
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