devapp/owners/owners.go - build - Git at Google

 // Copyright 2018 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.

 package owners

 import (
 	"bytes"
 	"encoding/json"
 	"html/template"
 	"log"
 	"net/http"
 )

 type Owner struct {
 	GitHubUsername string `json:"githubUsername"`
 	GerritEmail    string `json:"gerritEmail"`
 }

 type Entry struct {
 	Primary   []Owner `json:"primary"`
 	Secondary []Owner `json:"secondary,omitempty"`
 }

 type Request struct {
 	Payload struct {
 		Paths []string `json:"paths"`
 	} `json:"payload"`
 	Version int `json:"v"` // API version
 }

 type Response struct {
 	Payload struct {
 		Entries map[string]*Entry `json:"entries"` // paths in request -> Entry
 	} `json:"payload"`
 	Error string `json:"error,omitempty"`
 }

 // match takes a path consisting of the repo name and full path of a file or
 // directory within that repo and returns the deepest Entry match in the file
 // hierarchy for the given resource.
 func match(path string) *Entry {
 	var deepestPath string
 	for p := range entries {
 		if hasPathPrefix(path, p) && len(p) > len(deepestPath) {
 			deepestPath = p
 		}
 	}
 	return entries[deepestPath]
 }

 // hasPathPrefix reports whether the slash-separated path s
 // begins with the elements in prefix.
 //
 // Copied from go/src/cmd/go/internal/str.HasPathPrefix.
 func hasPathPrefix(s, prefix string) bool {
 	if len(s) == len(prefix) {
 		return s == prefix
 	}
 	if prefix == "" {
 		return true
 	}
 	if len(s) > len(prefix) {
 		if prefix[len(prefix)-1] == '/' || s[len(prefix)] == '/' {
 			return s[:len(prefix)] == prefix
 		}
 	}
 	return false
 }

 // Handler takes one or more paths and returns a map of each to a matching
 // Entry struct. If no Entry is matched for the path, the value for the key
 // is nil.
 func Handler(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Access-Control-Allow-Origin", "*")
 	w.Header().Set("Content-Type", "application/json")

 	switch r.Method {
 	case "GET":
 		serveIndex(w, r)
 		return
 	case "POST":
 		var req Request
 		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
 			jsonError(w, "unable to decode request", http.StatusBadRequest)
 			// TODO: increment expvar for monitoring.
 			log.Printf("unable to decode owners request: %v", err)
 			return
 		}

 		var resp Response
 		resp.Payload.Entries = make(map[string]*Entry)
 		for _, p := range req.Payload.Paths {
 			resp.Payload.Entries[p] = match(p)
 		}
 		var buf bytes.Buffer
 		if err := json.NewEncoder(&buf).Encode(resp); err != nil {
 			jsonError(w, "unable to encode response", http.StatusInternalServerError)
 			// TODO: increment expvar for monitoring.
 			log.Printf("unable to encode owners response: %v", err)
 			return
 		}
 		w.Write(buf.Bytes())
 	case "OPTIONS":
 		// Likely a CORS preflight request; leave resp.Payload empty.
 	default:
 		jsonError(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
 		return
 	}
 }

 func jsonError(w http.ResponseWriter, text string, code int) {
 	w.WriteHeader(code)
 	var buf bytes.Buffer
 	if err := json.NewEncoder(&buf).Encode(Response{Error: text}); err != nil {
 		// TODO: increment expvar for monitoring.
 		log.Printf("unable to encode error response: %v", err)
 		return
 	}
 	w.Write(buf.Bytes())
 }

 func serveIndex(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")

 	var buf bytes.Buffer
 	if err := indexTmpl.Execute(&buf, entries); err != nil {
 		log.Printf("unable to execute index template: %v", err)
 		http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
 		return
 	}
 	w.Write(buf.Bytes())
 }

 var indexTmpl = template.Must(template.New("index").Parse(`<!DOCTYPE html>
 <html lang="en">
 <title>Go Code Owners</title>
 <meta name=viewport content="width=device-width, initial-scale=1">
 <style>
 * {
 	box-sizing: border-box;
 	margin: 0;
 	padding: 0;
 }
 body {
 	font-family: sans-serif;
 	margin: 1rem 1.5rem;
 }
 .header {
 	color: #666;
 	font-size: 90%;
 	margin-bottom: 1rem;
 }
 .table-header {
 	font-weight: bold;
 	position: sticky;
 	top: 0;
 }
 .table-header,
 .entry {
 	background-color: #fff;
 	border-bottom: 1px solid #ddd;
 	display: flex;
 	flex-wrap: wrap;
 	justify-content: space-between;
 	margin: .15rem 0;
 	padding: .15rem 0;
 }
 .path,
 .primary,
 .secondary {
 	flex-basis: 33.3%;
 }
 </style>
 <header class="header">
 	Alter these entries at
 	<a href="https://go.googlesource.com/build/+/master/devapp/owners"
 		target="_blank" rel="noopener">golang.org/x/build/devapp/owners</a>
 </header>
 <main>
 <div class="table-header">
 	<span class="path">Path</span>
 	<span class="primary">Primaries</span>
 	<span class="secondary">Secondaries</span>
 </div>
 {{range $path, $entry := .}}
 	<div class="entry">
 		<span class="path">{{$path}}</span>
 		<span class="primary">
 			{{range .Primary}}
 				<a href="https://github.com/{{.GitHubUsername}}" target="_blank" rel="noopener">@{{.GitHubUsername}}</a>
 			{{end}}
 		</span>
 		<span class="secondary">
 			{{range .Secondary}}
 				<a href="https://github.com/{{.GitHubUsername}}" target="_blank" rel="noopener">@{{.GitHubUsername}}</a>
 			{{end}}
 		</span>
 	</div>
 {{end}}
 </main>
 `))
	// Copyright 2018 The Go Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style
	// license that can be found in the LICENSE file.

	package owners

	import (
	"bytes"
	"encoding/json"
	"html/template"
	"log"
	"net/http"
	)

	type Owner struct {
	GitHubUsername string `json:"githubUsername"`
	GerritEmail string `json:"gerritEmail"`
	}

	type Entry struct {
	Primary []Owner `json:"primary"`
	Secondary []Owner `json:"secondary,omitempty"`
	}

	type Request struct {
	Payload struct {
	Paths []string `json:"paths"`
	} `json:"payload"`
	Version int `json:"v"` // API version
	}

	type Response struct {
	Payload struct {
	Entries map[string]*Entry `json:"entries"` // paths in request -> Entry
	} `json:"payload"`
	Error string `json:"error,omitempty"`
	}

	// match takes a path consisting of the repo name and full path of a file or
	// directory within that repo and returns the deepest Entry match in the file
	// hierarchy for the given resource.
	func match(path string) *Entry {
	var deepestPath string
	for p := range entries {
	if hasPathPrefix(path, p) && len(p) > len(deepestPath) {
	deepestPath = p
	}
	}
	return entries[deepestPath]
	}

	// hasPathPrefix reports whether the slash-separated path s
	// begins with the elements in prefix.
	//
	// Copied from go/src/cmd/go/internal/str.HasPathPrefix.
	func hasPathPrefix(s, prefix string) bool {
	if len(s) == len(prefix) {
	return s == prefix
	}
	if prefix == "" {
	return true
	}
	if len(s) > len(prefix) {
	if prefix[len(prefix)-1] == '/' \|\| s[len(prefix)] == '/' {
	return s[:len(prefix)] == prefix
	}
	}
	return false
	}

	// Handler takes one or more paths and returns a map of each to a matching
	// Entry struct. If no Entry is matched for the path, the value for the key
	// is nil.
	func Handler(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Access-Control-Allow-Origin", "*")
	w.Header().Set("Content-Type", "application/json")

	switch r.Method {
	case "GET":
	serveIndex(w, r)
	return
	case "POST":
	var req Request
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
	jsonError(w, "unable to decode request", http.StatusBadRequest)
	// TODO: increment expvar for monitoring.
	log.Printf("unable to decode owners request: %v", err)
	return
	}

	var resp Response
	resp.Payload.Entries = make(map[string]*Entry)
	for _, p := range req.Payload.Paths {
	resp.Payload.Entries[p] = match(p)
	}
	var buf bytes.Buffer
	if err := json.NewEncoder(&buf).Encode(resp); err != nil {
	jsonError(w, "unable to encode response", http.StatusInternalServerError)
	// TODO: increment expvar for monitoring.
	log.Printf("unable to encode owners response: %v", err)
	return
	}
	w.Write(buf.Bytes())
	case "OPTIONS":
	// Likely a CORS preflight request; leave resp.Payload empty.
	default:
	jsonError(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
	return
	}
	}

	func jsonError(w http.ResponseWriter, text string, code int) {
	w.WriteHeader(code)
	var buf bytes.Buffer
	if err := json.NewEncoder(&buf).Encode(Response{Error: text}); err != nil {
	// TODO: increment expvar for monitoring.
	log.Printf("unable to encode error response: %v", err)
	return
	}
	w.Write(buf.Bytes())
	}

	func serveIndex(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")

	var buf bytes.Buffer
	if err := indexTmpl.Execute(&buf, entries); err != nil {
	log.Printf("unable to execute index template: %v", err)
	http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
	return
	}
	w.Write(buf.Bytes())
	}

	var indexTmpl = template.Must(template.New("index").Parse(`<!DOCTYPE html>
	<html lang="en">
	<title>Go Code Owners</title>
	<meta name=viewport content="width=device-width, initial-scale=1">
	<style>
	* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
	}
	body {
	font-family: sans-serif;
	margin: 1rem 1.5rem;
	}
	.header {
	color: #666;
	font-size: 90%;
	margin-bottom: 1rem;
	}
	.table-header {
	font-weight: bold;
	position: sticky;
	top: 0;
	}
	.table-header,
	.entry {
	background-color: #fff;
	border-bottom: 1px solid #ddd;
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	margin: .15rem 0;
	padding: .15rem 0;
	}
	.path,
	.primary,
	.secondary {
	flex-basis: 33.3%;
	}
	</style>
	<header class="header">
	Alter these entries at
	<a href="https://go.googlesource.com/build/+/master/devapp/owners"
	target="_blank" rel="noopener">golang.org/x/build/devapp/owners</a>
	</header>
	<main>
	<div class="table-header">
	<span class="path">Path</span>
	<span class="primary">Primaries</span>
	<span class="secondary">Secondaries</span>
	</div>
	{{range $path, $entry := .}}
	<div class="entry">
	<span class="path">{{$path}}</span>
	<span class="primary">
	{{range .Primary}}
	<a href="https://github.com/{{.GitHubUsername}}" target="_blank" rel="noopener">@{{.GitHubUsername}}</a>
	{{end}}
	</span>
	<span class="secondary">
	{{range .Secondary}}
	<a href="https://github.com/{{.GitHubUsername}}" target="_blank" rel="noopener">@{{.GitHubUsername}}</a>
	{{end}}
	</span>
	</div>
	{{end}}
	</main>
	`))