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web.go
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web.go
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package main
import (
"encoding/json"
"fmt"
"html/template"
"io/ioutil"
"log"
"net/http"
"runtime"
"strconv"
"strings"
"time"
"github.com/gorilla/mux"
"github.com/kaginawa/kaginawa-server"
)
const (
templateExt = ".html"
contentTypeJSON = "application/json"
)
var (
templates = make(map[string]*template.Template)
funcMap = template.FuncMap{
// time format
"t_fmt": func(ts int64, fmt string) string {
return time.Unix(ts, 0).Format(fmt)
},
// fresh check
"t_fresh": func(ts int64, min int) bool {
return time.Unix(ts, 0).After(time.Now().Add(-time.Duration(min) * time.Minute))
},
// human readable byte size
"b_fmt": func(bytes interface{}) string {
var b uint64
switch bytes.(type) {
case uint64:
b = bytes.(uint64)
case int64:
b = uint64(bytes.(int64))
}
if b > 1024*1024*1024 {
return fmt.Sprintf("%dGB", b/1024/1024/1024)
} else if b > 1024*1024 {
return fmt.Sprintf("%dMB", b/1024/1024)
} else if b > 1024 {
return fmt.Sprintf("%dKB", b/1024)
} else {
return fmt.Sprintf("%dB", b)
}
},
}
)
type indexParams struct {
Meta meta
RemoteIP string
RemoteHost string
FindError string
}
type meta struct {
Title string
UserName string
GoVersion string
NumGoroutines int
MemStats runtime.MemStats
}
func newMeta(r *http.Request, title string) meta {
var mem runtime.MemStats
runtime.ReadMemStats(&mem)
return meta{
Title: "Kaginawa Server | " + title,
UserName: getSession(r).name(),
GoVersion: runtime.Version(),
NumGoroutines: runtime.NumGoroutine(),
MemStats: mem,
}
}
func initTemplate(dir string) {
for _, name := range loadTemplates(dir) {
templates[name] = parseTemplate(name, dir)
}
}
func remoteIP(r *http.Request) (ip string) {
forwardedFor := r.Header.Get("X-Forwarded-For")
if len(forwardedFor) > 0 {
list := strings.Split(forwardedFor, ",")
ip = list[len(list)-1]
}
if len(ip) == 0 {
ip = trimPort(r.RemoteAddr)
}
return
}
// handleIndex handles index requests.
//
// - Method: GET or HEAD
// - Client: Any
// - Access: Public
// - Response: HTML
func handleIndex(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet && r.Method != http.MethodHead {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
ip := remoteIP(r)
host, err := reverseLookup(ip)
if err != nil {
log.Printf("failed to execute reverse lookup for %s: %v", ip, err)
}
execTemplate(w, "index", indexParams{
newMeta(r, "Welcome"),
ip,
host,
"",
})
}
// handleFavicon handles favicon requests.
//
// - Method: Any
// - Client: Any
// - Access: Public
// - Response: File
func handleFavicon(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "assets/favicon.ico")
}
// handleFind handles node finding requests.
//
// - Method: POST
// - Client: Browser
// - Access: Admin
// - Response: 303 redirect
func handleFind(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !getSession(r).isLoggedIn() {
http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
return
}
if err := r.ParseForm(); err != nil {
log.Printf("failed to parse form: %v", err)
http.Error(w, "Invalid form", http.StatusBadRequest)
return
}
findBy := r.FormValue("find-by")
findString := strings.TrimSpace(r.FormValue("find-string"))
if len(findString) == 0 {
handleFindError(w, r, "Please input find string")
return
}
switch findBy {
case "id":
report, err := db.GetReportByID(findString)
if err != nil {
handleFindError(w, r, "Database unavailable")
return
}
if report == nil {
handleFindError(w, r, "Not found: "+findString)
return
}
http.Redirect(w, r, "/nodes/"+report.ID, http.StatusSeeOther)
case "custom-id":
reports, err := db.ListReportsByCustomID(findString, -1, kaginawa.IDAttributes)
if err != nil {
handleFindError(w, r, "Database unavailable")
return
}
handleFindResult(w, r, findBy, findString, reports)
case "hostname":
matches, err := kaginawa.MatchReports(db, 0, kaginawa.ListViewAttributes, func(r kaginawa.Report) bool {
return r.Hostname == findString
})
if err != nil {
handleFindError(w, r, "Database unavailable")
return
}
handleFindResult(w, r, findBy, findString, matches)
case "global-addr":
matches, err := kaginawa.MatchReports(db, 0, kaginawa.ListViewAttributes, func(r kaginawa.Report) bool {
return r.GlobalIP == findString || r.GlobalHost == findString
})
if err != nil {
handleFindError(w, r, "Database unavailable")
return
}
handleFindResult(w, r, findBy, findString, matches)
case "local-addr":
matches, err := kaginawa.MatchReports(db, 0, kaginawa.ListViewAttributes, func(r kaginawa.Report) bool {
return r.LocalIPv4 == findString || r.LocalIPv6 == findString
})
if err != nil {
handleFindError(w, r, "Database unavailable")
return
}
handleFindResult(w, r, findBy, findString, matches)
case "version":
if !strings.HasPrefix(findString, "v") {
findString = "v" + findString
}
matches, err := kaginawa.MatchReports(db, 0, kaginawa.ListViewAttributes, func(r kaginawa.Report) bool {
return r.AgentVersion == findString
})
if err != nil {
handleFindError(w, r, "Database unavailable")
return
}
handleFindResult(w, r, findBy, findString, matches)
default:
handleFindError(w, r, "Unknown option: "+findBy)
}
}
func handleFindError(w http.ResponseWriter, r *http.Request, msg string) {
ip := remoteIP(r)
host, err := reverseLookup(ip)
if err != nil {
log.Printf("failed to execute reverse lookup for %s: %v", ip, err)
}
execTemplate(w, "index", indexParams{
newMeta(r, "Welcome"),
ip,
host,
msg,
})
}
func handleFindResult(w http.ResponseWriter, r *http.Request, findBy, findString string, matches []kaginawa.Report) {
switch len(matches) {
case 0:
handleFindError(w, r, "Not found: "+findString)
case 1:
http.Redirect(w, r, "/nodes/"+matches[0].ID, http.StatusSeeOther)
default:
http.Redirect(w, r, "/nodes?"+findBy+"="+findString, http.StatusSeeOther)
}
}
// handleNodes handles list of nodes requests.
//
// - Method: GET or HEAD
// - Client: Browser or API
// - Access: Admin
// - Response: HTML or JSON
func handleNodes(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet && r.Method != http.MethodHead {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if r.Header.Get("Accept") == contentTypeJSON {
handleNodesAPI(w, r)
} else {
handleNodesWeb(w, r)
}
}
func handleNodesWeb(w http.ResponseWriter, r *http.Request) {
if !getSession(r).isLoggedIn() {
http.Redirect(w, r, "/login", http.StatusSeeOther)
return
}
page := page(r)
limit := limit(r)
offset := (page - 1) * limit
customID := r.URL.Query().Get("custom-id")
hostname := r.URL.Query().Get("hostname")
globalAddr := r.URL.Query().Get("global-addr")
localAddr := r.URL.Query().Get("local-addr")
version := r.URL.Query().Get("version")
minutesStr := r.URL.Query().Get("minutes")
minutes := 0
var err error
if len(minutesStr) > 0 {
minutes, err = strconv.Atoi(minutesStr)
if err != nil {
http.Error(w, "Invalid parameter: minutes = "+minutesStr, http.StatusBadRequest)
return
}
}
filtered := minutes > 0
var reports []kaginawa.Report
var count int
if len(customID+hostname+globalAddr+localAddr+version) == 0 {
reports, count, err = db.CountAndListReports(offset, limit, minutes, kaginawa.ListViewAttributes)
if err != nil {
log.Printf("failed to list reports: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
} else if len(customID) > 0 && len(hostname+globalAddr+localAddr+version) == 0 {
matches, err := db.ListReportsByCustomID(customID, minutes, kaginawa.ListViewAttributes)
if err != nil {
log.Printf("failed to list reports: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
count = len(matches)
reports = kaginawa.SubReports(matches, offset, limit)
filtered = true
} else {
if !strings.HasPrefix(version, "v") {
version = "v" + version
}
matches, err := kaginawa.MatchReports(db, minutes, kaginawa.ListViewAttributes, func(r kaginawa.Report) bool {
if len(customID) > 0 && r.CustomID == customID {
return true
}
if len(hostname) > 0 && r.Hostname == hostname {
return true
}
if len(globalAddr) > 0 && (r.GlobalIP == globalAddr || r.GlobalHost == globalAddr) {
return true
}
if len(localAddr) > 0 && (r.LocalIPv4 == localAddr || r.LocalIPv6 == localAddr) {
return true
}
if len(version) > 0 && r.AgentVersion == version {
return true
}
return false
})
if err != nil {
log.Printf("failed to list reports: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
count = len(matches)
reports = kaginawa.SubReports(matches, offset, limit)
filtered = true
}
execTemplate(w, "nodes", struct {
Meta meta
Pager Pager
Reports []kaginawa.Report
Filtered bool
}{
newMeta(r, "List of Nodes"),
newPager(count, len(reports), page, limit, r.URL.Query()),
reports,
filtered,
})
}
func handleNodesAPI(w http.ResponseWriter, r *http.Request) {
if !validateAPIKey(r, true) {
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
customID := r.URL.Query().Get("custom-id")
minutesStr := r.URL.Query().Get("minutes")
minutes := 0
if len(minutesStr) > 0 {
if n, err := strconv.Atoi(minutesStr); err == nil {
minutes = n
}
}
projection := kaginawa.AllAttributes
switch r.URL.Query().Get("projection") {
case "id":
projection = kaginawa.IDAttributes
case "list-view":
projection = kaginawa.ListViewAttributes
case "measurement":
projection = kaginawa.MeasurementAttributes
}
var reports []kaginawa.Report
if len(customID) > 0 {
records, err := db.ListReportsByCustomID(customID, minutes, projection)
if err != nil {
log.Printf("failed to list reports: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
reports = records
} else {
count, err := db.CountReports()
if err != nil {
log.Printf("failed to count reports: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
records, err := db.ListReports(0, count, minutes, projection)
if err != nil {
log.Printf("failed to list reports: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
reports = records
}
if reports == nil {
reports = []kaginawa.Report{}
}
body, err := json.Marshal(reports)
if err != nil {
log.Printf("failed to marshal response: %v", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
w.Header().Add("Content-Type", contentTypeJSON)
if _, err := w.Write(body); err != nil {
log.Printf("failed to write body: %v", err)
}
}
// handleNodes handles single node requests.
//
// - Method: GET or HEAD
// - Client: Browser or API
// - Access: Admin
// - Response: HTML or JSON
func handleNode(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
if len(id) == 0 {
http.NotFound(w, r)
return
}
if r.Method != http.MethodGet && r.Method != http.MethodHead {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if r.Header.Get("Accept") == contentTypeJSON {
handleNodeAPI(w, r, id)
} else {
handleNodeWeb(w, r, id, "", "", "")
}
}
func handleNodeWeb(w http.ResponseWriter, r *http.Request, id, user, password, response string) {
if !getSession(r).isLoggedIn() {
http.Redirect(w, r, "/login", http.StatusSeeOther)
return
}
rep, err := db.GetReportByID(id)
if err != nil {
log.Printf("failed to get Report (id=%s): %v", id, err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
execTemplate(w, "node", struct {
Meta meta
Report kaginawa.Report
User string
Password string
Response string
}{
newMeta(r, "Node Detail"),
*rep,
user,
password,
response,
})
}
func handleNodeAPI(w http.ResponseWriter, r *http.Request, id string) {
apiKey := strings.Replace(r.Header.Get("Authorization"), "token ", "", 1)
if len(apiKey) == 0 {
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
if !validateAPIKey(r, true) {
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
record, err := db.GetReportByID(id)
if err != nil {
log.Printf("failed to get report: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
if record == nil {
http.NotFound(w, r)
return
}
body, err := json.Marshal(record)
if err != nil {
log.Printf("failed to marshal response: %v", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
w.Header().Add("Content-Type", contentTypeJSON)
if _, err := w.Write(body); err != nil {
log.Printf("failed to write body: %v", err)
}
}
// handleAdmin handles admin console requests.
//
// - Method: GET or HEAD
// - Client: Browser
// - Access: Admin
// - Response: HTML
func handleAdmin(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodGet && r.Method != http.MethodHead {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !getSession(r).isLoggedIn() {
http.Redirect(w, r, "/login", http.StatusSeeOther)
return
}
keys, err := db.ListAPIKeys()
if err != nil {
log.Printf("failed to list api keys: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
servers, err := db.ListSSHServers()
if err != nil {
log.Printf("failed to list ssh servers: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
execTemplate(w, "admin", struct {
Meta meta
APIKeys []kaginawa.APIKey
SSHServers []kaginawa.SSHServer
}{
newMeta(r, "Admin"),
keys,
servers,
})
}
// handleNewAPIKey handles API key creation requests.
//
// - Method: POST
// - Client: Browser
// - Access: Admin
// - Response: 303 redirect
func handleNewAPIKey(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !getSession(r).isLoggedIn() {
http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
return
}
if err := r.ParseForm(); err != nil {
log.Printf("failed to parse form: %v", err)
http.Error(w, "Invalid form", http.StatusBadRequest)
return
}
k := strings.TrimSpace(r.FormValue("key"))
l := strings.TrimSpace(r.FormValue("label"))
a := r.FormValue("admin") == "yes"
if len(k) == 0 {
http.Error(w, "Key is empty", http.StatusBadRequest)
return
}
if err := db.PutAPIKey(kaginawa.APIKey{Key: k, Label: l, Admin: a}); err != nil {
log.Printf("failed to put api key: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/admin", http.StatusSeeOther)
}
// handleNewAPIKey handles SSH server registration requests.
//
// - Method: POST
// - Client: Browser
// - Access: Admin
// - Response: 303 redirect
func handleNewSSHServer(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !getSession(r).isLoggedIn() {
http.Redirect(w, r, "/login", http.StatusSeeOther)
return
}
if err := r.ParseForm(); err != nil {
log.Printf("failed to parse form: %v", err)
http.Error(w, "Invalid form", http.StatusBadRequest)
return
}
h := strings.TrimSpace(r.FormValue("host"))
p := strings.TrimSpace(r.FormValue("port"))
u := strings.TrimSpace(r.FormValue("user"))
k := strings.TrimSpace(r.FormValue("key"))
pw := strings.TrimSpace(r.FormValue("password"))
if len(h) == 0 {
http.Error(w, "Host is empty", http.StatusBadRequest)
return
}
port, err := strconv.Atoi(p)
if err != nil {
http.Error(w, fmt.Sprintf("%s is not a port number", p), http.StatusBadRequest)
return
}
if len(u) == 0 {
http.Error(w, "User is empty", http.StatusBadRequest)
return
}
if len(k) == 0 && len(p) == 0 {
http.Error(w, "Key or password is empty", http.StatusBadRequest)
return
}
if err := db.PutSSHServer(kaginawa.SSHServer{Host: h, Port: port, User: u, Key: k, Password: pw}); err != nil {
log.Printf("failed to put ssh server: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/admin", http.StatusSeeOther)
}
// handleSSHServer handles single SSH server requests.
//
// - Method: GET, HEAD
// - Client: API
// - Access: Admin
// - Response: JSON
func handleSSHServer(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
if len(id) == 0 {
http.NotFound(w, r)
return
}
if r.Method != http.MethodGet && r.Method != http.MethodHead {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !validateAPIKey(r, true) {
http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
server, err := db.GetSSHServerByHost(id)
if err != nil {
log.Printf("failed to get ssh server: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
if server == nil {
http.NotFound(w, r)
return
}
body, err := json.Marshal(server)
if err != nil {
log.Printf("failed to marshal response: %v", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
w.Header().Add("Content-Type", contentTypeJSON)
if _, err := w.Write(body); err != nil {
log.Printf("failed to write body: %v", err)
}
}
// handleHistories handles list of histories for specified node.
//
// - Method: GET
// - Client: Browser or API
// - Access: Admin
// - Response: JSON
func handleHistories(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
if len(id) == 0 {
http.NotFound(w, r)
return
}
if r.Method != http.MethodGet {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !validateAPIKey(r, true) {
if !getSession(r).isLoggedIn() {
http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
return
}
}
end := time.Now()
endParam := r.URL.Query().Get("end")
if len(endParam) > 0 {
if raw, err := strconv.ParseInt(endParam, 10, 64); err == nil {
end = time.Unix(raw, 0)
}
}
begin := end.AddDate(0, 0, -1)
beginParam := r.URL.Query().Get("begin")
if len(beginParam) > 0 {
if raw, err := strconv.ParseInt(beginParam, 10, 64); err == nil {
begin = time.Unix(raw, 0)
}
}
projection := kaginawa.AllAttributes
switch r.URL.Query().Get("projection") {
case "id":
projection = kaginawa.IDAttributes
case "list-view":
projection = kaginawa.ListViewAttributes
case "measurement":
projection = kaginawa.MeasurementAttributes
}
logs, err := db.ListHistory(id, begin, end, projection)
if err != nil {
log.Printf("failed to query history: %v", err)
http.Error(w, "Database unavailable", http.StatusInternalServerError)
return
}
body, err := json.Marshal(logs)
if err != nil {
log.Printf("failed to marshal response: %v", err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
w.Header().Add("Content-Type", contentTypeJSON)
if _, err := w.Write(body); err != nil {
log.Printf("failed to write body: %v", err)
}
}
// handleNodeDelete handles delete request from web form.
//
// - Method: POST
// - Client: Browser
// - Access: Admin
// - Response: 303 redirect
func handleNodeDelete(w http.ResponseWriter, r *http.Request) {
id := mux.Vars(r)["id"]
if len(id) == 0 {
http.NotFound(w, r)
return
}
if r.Method != http.MethodPost {
http.Error(w, http.StatusText(http.StatusMethodNotAllowed), http.StatusMethodNotAllowed)
return
}
if !getSession(r).isLoggedIn() {
http.Error(w, http.StatusText(http.StatusForbidden), http.StatusForbidden)
return
}
if err := db.DeleteReport(id); err != nil {
log.Printf("failed to delete report %s: %v", id, err)
http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
}
http.Redirect(w, r, "/nodes", http.StatusSeeOther)
}
func loadTemplates(dir string) []string {
dirEntries, err := ioutil.ReadDir(dir)
if err != nil {
log.Fatalf("failed to read template directory \"%s\": %v", dir, err)
}
var templates []string
for _, fileInfo := range dirEntries {
if fileInfo.IsDir() {
continue
}
if !strings.HasSuffix(fileInfo.Name(), templateExt) {
continue
}
templates = append(templates, strings.Replace(fileInfo.Name(), templateExt, "", 1))
}
return templates
}
func parseTemplate(n, dir string) *template.Template {
list := []string{
dir + "/" + n + templateExt,
dir + "/_header" + templateExt,
dir + "/_footer" + templateExt,
}
t, err := template.New(n + ".html").Funcs(funcMap).ParseFiles(list...)
if err != nil {
panic(err)
}
return t
}
func execTemplate(w http.ResponseWriter, name string, attributes interface{}) {
if err := templates[name].Funcs(funcMap).Execute(w, attributes); err != nil {
log.Printf("template error in %s: %v", name, err)
http.Error(w, "Template error: "+name, http.StatusInternalServerError)
}
}