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main.go
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main.go
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package main
import (
"bytes"
"cmp"
"context"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/sha256"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"database/sql"
"embed"
"encoding/base64"
"encoding/hex"
"encoding/json"
"encoding/pem"
"errors"
"flag"
"fmt"
"html"
"html/template"
"io"
"io/fs"
"log"
"math/big"
mathRand "math/rand"
"net"
"net/http"
"net/mail"
"net/smtp"
"net/url"
"os"
"os/signal"
"path"
"runtime"
"slices"
"strconv"
"strings"
"sync"
"syscall"
textTemplate "text/template"
"time"
"github.com/caddyserver/certmagic"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"github.com/mattn/go-sqlite3"
"github.com/mholt/acmez/acme"
"github.com/miekg/dns"
"golang.org/x/crypto/bcrypt"
"golang.org/x/mod/semver"
)
var BUILD = "dev"
var CA = certmagic.LetsEncryptStagingCA
var VERSION = "v0.2.0"
//go:embed schema.sql
var sqlSchema string
const SELF_SIGNED_CERT_NAME = "self-signed-cert.pem"
const SELF_SIGNED_KEY_NAME = "self-signed-key.pem"
func initDB(immediate bool) *sql.DB {
if _, err := os.Stat("statusnook-data"); errors.Is(err, os.ErrNotExist) {
err := os.Mkdir("statusnook-data", os.ModePerm)
if err != nil {
log.Fatalf("initDB.Mkdir: %s", err)
}
}
dsn := "file:statusnook-data/app.db?_foreign_keys=on&_journal_mode=wal"
if immediate {
dsn += "&_txlock=immediate"
}
db, err := sql.Open("sqlite3", dsn)
if err != nil {
log.Fatalf("initDB.Open: %s", err)
}
if immediate {
files, err := migrationsFS.ReadDir("migrations")
if err != nil {
log.Fatalf("initDB.ReadDir: %s", err)
}
slices.SortFunc(files, func(a, b fs.DirEntry) int {
return cmp.Compare(a.Name(), b.Name())
})
const tableCountQuery = `
select
count(*)
from
sqlite_schema
where
type = 'table' and
name not like 'sqlite_%';
`
tableCount := 0
row := db.QueryRow(tableCountQuery)
err = row.Scan(&tableCount)
if err != nil {
log.Fatalf("initDB.ScanTableCount: %s", err)
}
if tableCount == 0 {
tx, err := db.Begin()
if err != nil {
log.Fatalf("initDB.BeginExecSchema: %s", err)
}
defer tx.Rollback()
_, err = tx.Exec(sqlSchema)
if err != nil {
log.Fatalf("initDB.ExecSchema: %s", err)
}
params := []any{}
placeholders := ""
for i, v := range files {
placeholders += "(?, ?)"
if i < len(files)-1 {
placeholders += ", "
}
params = append(params, strings.TrimRight(v.Name(), ".sql"), true)
}
insertMigrationQuery := fmt.Sprintf(
`insert into migration(name, skipped) values %s;`,
placeholders,
)
_, err = tx.Exec(insertMigrationQuery, params...)
if err != nil {
log.Fatalf("initDB.ExecInsertMigration: %s", err)
}
err = tx.Commit()
if err != nil {
log.Fatalf("initDB.CommitExecSchema: %s", err)
}
} else {
const createMigrationTableQuery = `
create table if not exists migration(
id integer primary key,
name text not null unique,
skipped int not null
);
`
_, err := db.Exec(createMigrationTableQuery)
if err != nil {
log.Fatalf("initDB.ExecCreateMigrationTable: %s", err)
}
existingMigrations := map[string]bool{}
rows, err := db.Query("select name from migration")
if err != nil {
log.Fatalf("initDB.ExecQueryMigrations: %s", err)
}
defer rows.Close()
for rows.Next() {
var name string
err = rows.Scan(&name)
if err != nil {
log.Fatalf("initDB.ScanMigration: %s", err)
}
existingMigrations[name] = true
}
for _, file := range files {
migrationName := strings.TrimRight(file.Name(), ".sql")
if _, ok := existingMigrations[migrationName]; ok {
continue
}
data, err := migrationsFS.ReadFile(path.Join("migrations", file.Name()))
if err != nil {
log.Fatalf("initDB.ReadFile %s: %s", file.Name(), err)
}
func() {
tx, err := db.Begin()
if err != nil {
log.Fatalf("initDB.BeginMigration %s: %s", file.Name(), err)
}
defer tx.Rollback()
_, err = tx.Exec(string(data))
if err != nil {
log.Fatalf("initDB.ExecMigration %s: %s", file.Name(), err)
}
insertMigrationQuery := fmt.Sprintf(
`insert into migration(name, skipped) values ('%s', false)`,
migrationName,
)
_, err = tx.Exec(insertMigrationQuery)
if err != nil {
log.Fatalf("initDB.ExecInsertMigrationSkip %s: %s", file.Name(), err)
}
err = tx.Commit()
if err != nil {
log.Fatalf("initDB.CommitMigration %s: %s", file.Name(), err)
}
}()
}
}
}
return db
}
var tmpls = map[string]*template.Template{}
func parseTmpl(name string, markup string) (*template.Template, error) {
if tmpl, ok := tmpls[name]; ok {
return tmpl, nil
}
const rootTmpl = `
<!DOCTYPE html>
<html>
<head>
<title>{{template "title" .}}</title>
<link rel="stylesheet" href="/static/main.css">
<script type="text/javascript" src="/static/htmx.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1" />
</head>
<body hx-history="false">
<div class="root">
<div class="page">
{{if .Ctx.Status}}
{{if and (not .Ctx.HideUnconfirmedDomain) (and .Ctx.Auth.ID .Ctx.UnconfirmedDomainProblem)}}
<div class="banner">
<span>
<span class="title">Action required</span>:
issues acquiring certificate for '{{.Ctx.UnconfirmedDomain}}'
</span>
<a href="/admin/settings" hx-boost="true">
click here for details
</a>
</div>
{{end}}
<div class="status-header">
<div>
<a id="nook-name" href="/" hx-boost="true">{{.Ctx.Name}}</a>
{{if .Ctx.AdminArea}}
<input id="nav-toggle" type="checkbox">
<label for="nav-toggle">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor">
<path fill-rule="evenodd" d="M2 4.75A.75.75 0 0 1 2.75 4h14.5a.75.75 0 0 1 0 1.5H2.75A.75.75 0 0 1 2 4.75ZM2 10a.75.75 0 0 1 .75-.75h14.5a.75.75 0 0 1 0 1.5H2.75A.75.75 0 0 1 2 10Zm0 5.25a.75.75 0 0 1 .75-.75h14.5a.75.75 0 0 1 0 1.5H2.75a.75.75 0 0 1-.75-.75Z" clip-rule="evenodd" />
</svg>
</label>
<div class="nav nav--mobile">
<a
href="/admin/alerts"
{{if eq .Ctx.Nav "alerts"}}class="active-nav"{{end}}
hx-boost="true"
>
Alerts
</a>
<a
href="/admin/monitors"
{{if eq .Ctx.Nav "monitors"}}class="active-nav"{{end}}
hx-boost="true"
>
Monitors
</a>
<a
href="/admin/services"
{{if eq .Ctx.Nav "services"}}class="active-nav"{{end}}
hx-boost="true"
>
Services
</a>
<a
href="/admin/notifications"
{{if eq .Ctx.Nav "notifications"}}class="active-nav"{{end}}
hx-boost="true"
>
Notifications
</a>
<a
href="/admin/settings"
{{if eq .Ctx.Nav "settings"}}class="active-nav"{{end}}
hx-boost="true"
>
Settings
</a>
<a
href="/admin/update"
{{if eq .Ctx.Nav "update"}}class="active-nav"{{end}}
hx-boost="true"
>
Update
</a>
<a hx-post="/logout">Log out</a>
</div>
{{end}}
</div>
{{if .Ctx.Index}}
<div>
<div class="get-updates-container">
{{if or .HasEmailAlertChannel .HasSlackSetup}}
<button class="get-updates">
<span>
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor">
<path d="M3.105 2.288a.75.75 0 0 0-.826.95l1.414 4.926A1.5 1.5 0 0 0 5.135 9.25h6.115a.75.75 0 0 1 0 1.5H5.135a1.5 1.5 0 0 0-1.442 1.086l-1.414 4.926a.75.75 0 0 0 .826.95 28.897 28.897 0 0 0 15.293-7.155.75.75 0 0 0 0-1.114A28.897 28.897 0 0 0 3.105 2.288Z" />
</svg>
Get updates
</span>
<span></span>
</button>
{{end}}
<dialog>
{{if .HasEmailAlertChannel}}
<button onclick="document.querySelector('.email-updates-modal').showModal();">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="w-5 h-5">
<path d="M3 4a2 2 0 0 0-2 2v1.161l8.441 4.221a1.25 1.25 0 0 0 1.118 0L19 7.162V6a2 2 0 0 0-2-2H3Z" />
<path d="m19 8.839-7.77 3.885a2.75 2.75 0 0 1-2.46 0L1 8.839V14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2V8.839Z" />
</svg>
Email
</button>
{{end}}
{{if and .HasEmailAlertChannel .HasSlackSetup}}
<hr>
{{end}}
{{if .HasSlackSetup}}
<a href="{{.HasSlackSetup}}" target="_blank">
<svg viewBox="0 0 124 124" fill="none" xmlns="http://www.w3.org/2000/svg">
<path d="M26.3996 78.2003C26.3996 85.3003 20.5996 91.1003 13.4996 91.1003C6.39961 91.1003 0.599609 85.3003 0.599609 78.2003C0.599609 71.1003 6.39961 65.3003 13.4996 65.3003H26.3996V78.2003Z" fill="#E01E5A"/>
<path d="M32.9004 78.2003C32.9004 71.1003 38.7004 65.3003 45.8004 65.3003C52.9004 65.3003 58.7004 71.1003 58.7004 78.2003V110.5C58.7004 117.6 52.9004 123.4 45.8004 123.4C38.7004 123.4 32.9004 117.6 32.9004 110.5V78.2003Z" fill="#E01E5A"/>
<path d="M45.8004 26.4001C38.7004 26.4001 32.9004 20.6001 32.9004 13.5001C32.9004 6.4001 38.7004 0.600098 45.8004 0.600098C52.9004 0.600098 58.7004 6.4001 58.7004 13.5001V26.4001H45.8004Z" fill="#36C5F0"/>
<path d="M45.7996 32.8999C52.8996 32.8999 58.6996 38.6999 58.6996 45.7999C58.6996 52.8999 52.8996 58.6999 45.7996 58.6999H13.4996C6.39961 58.6999 0.599609 52.8999 0.599609 45.7999C0.599609 38.6999 6.39961 32.8999 13.4996 32.8999H45.7996Z" fill="#36C5F0"/>
<path d="M97.5996 45.7999C97.5996 38.6999 103.4 32.8999 110.5 32.8999C117.6 32.8999 123.4 38.6999 123.4 45.7999C123.4 52.8999 117.6 58.6999 110.5 58.6999H97.5996V45.7999Z" fill="#2EB67D"/>
<path d="M91.0988 45.8001C91.0988 52.9001 85.2988 58.7001 78.1988 58.7001C71.0988 58.7001 65.2988 52.9001 65.2988 45.8001V13.5001C65.2988 6.4001 71.0988 0.600098 78.1988 0.600098C85.2988 0.600098 91.0988 6.4001 91.0988 13.5001V45.8001Z" fill="#2EB67D"/>
<path d="M78.1988 97.6001C85.2988 97.6001 91.0988 103.4 91.0988 110.5C91.0988 117.6 85.2988 123.4 78.1988 123.4C71.0988 123.4 65.2988 117.6 65.2988 110.5V97.6001H78.1988Z" fill="#ECB22E"/>
<path d="M78.1988 91.1003C71.0988 91.1003 65.2988 85.3003 65.2988 78.2003C65.2988 71.1003 71.0988 65.3003 78.1988 65.3003H110.499C117.599 65.3003 123.399 71.1003 123.399 78.2003C123.399 85.3003 117.599 91.1003 110.499 91.1003H78.1988Z" fill="#ECB22E"/>
</svg>
Slack
</a>
{{end}}
</dialog>
</div>
{{if and .Ctx.Index .Ctx.Auth.ID}}
<a class="icon-button" href="/admin/alerts" hx-boost="true">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="w-5 h-5">
<path fill-rule="evenodd" d="M2.5 3A1.5 1.5 0 001 4.5v4A1.5 1.5 0 002.5 10h6A1.5 1.5 0 0010 8.5v-4A1.5 1.5 0 008.5 3h-6zm11 2A1.5 1.5 0 0012 6.5v7a1.5 1.5 0 001.5 1.5h4a1.5 1.5 0 001.5-1.5v-7A1.5 1.5 0 0017.5 5h-4zm-10 7A1.5 1.5 0 002 13.5v2A1.5 1.5 0 003.5 17h6a1.5 1.5 0 001.5-1.5v-2A1.5 1.5 0 009.5 12h-6z" clip-rule="evenodd" />
</svg>
</a>
{{end}}
</div>
{{else if .Ctx.AdminArea}}
<div class="nav">
<a
href="/admin/alerts"
{{if eq .Ctx.Nav "alerts"}}class="active-nav"{{end}}
hx-boost="true"
>
Alerts
</a>
<a
href="/admin/monitors"
{{if eq .Ctx.Nav "monitors"}}class="active-nav"{{end}}
hx-boost="true"
>
Monitors
</a>
<a
href="/admin/services"
{{if eq .Ctx.Nav "services"}}class="active-nav"{{end}}
hx-boost="true"
>
Services
</a>
<a
href="/admin/notifications"
{{if eq .Ctx.Nav "notifications"}}class="active-nav"{{end}}
hx-boost="true"
>
Notifications
</a>
<div class="menu">
<button class="menu-button">
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" fill="currentColor" class="w-4 h-4">
<path fill-rule="evenodd" d="M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z" clip-rule="evenodd" />
</svg>
</button>
<dialog>
<a href="/admin/settings" hx-boost="true">Settings</a>
<a href="/admin/update" hx-boost="true">Update</a>
<a hx-post="/logout">Log out</a>
</dialog>
</div>
</div>
{{end}}
</div>
{{end}}
{{template "body" .}}
</div>
</div>
<script>
document.body.addEventListener("htmx:beforeSwap", function(evt) {
if (!evt.detail.shouldSwap) {
evt.detail.shouldSwap = evt.detail.xhr.status === 400;
}
});
document.body.addEventListener("htmx:configRequest", function(evt) {
evt.detail.headers["csrf-token"] = "{{.Ctx.Auth.CSRFToken}}";
});
function onClick(e) {
if (!e.target.classList.contains("menu-button")) {
[...document.querySelectorAll("dialog:not(.modal)")].forEach(e => {e.close();});
document.removeEventListener("click", onClick);
}
}
[...document.querySelectorAll(".menu-button")].forEach(function(e) {
e.addEventListener("click", function() {
const options = e.closest(".menu").querySelector("dialog");
if (!options.open) {
[...document.querySelectorAll("dialog:not(.modal)")].forEach(e => {e.close();});
options.show();
document.addEventListener("click", onClick);
} else {
options.close();
}
});
});
{{if .Ctx.ShouldAttemptRedirect}}
(async () => {
const getResolveResponse = await fetch(
"https://" + "{{.Ctx.Domain}}/resolve",
{method: "GET"}
);
if (!getResolveResponse.ok || !getResolveResponse.headers.get("X-Statusnook")) {
return;
}
const postResolveResponse = await fetch(
window.location.origin + "/admin/resolve",
{
method: "POST",
headers: {
"csrf-token": "{{.Ctx.Auth.CSRFToken}}"
}
}
);
if (!postResolveResponse.ok) {
return;
}
const token = await postResolveResponse.text();
const params = new URLSearchParams({
token,
after: window.location.pathname,
});
window.location.href =
"https://" + "{{.Ctx.Domain}}/cross-auth?" + params.toString();
})();
{{end}}
</script>
</body>
</html>
`
tmpl, err := template.New(name).Parse(rootTmpl)
if err != nil {
return tmpl, err
}
tmpl, err = tmpl.Parse(markup)
if err != nil {
return tmpl, err
}
tmpls[name] = tmpl
return tmpl, nil
}
var emailTmpls = map[string]*template.Template{}
func parseEmailTmpl(name string, markup string) (*template.Template, error) {
if tmpl, ok := emailTmpls[name]; ok {
return tmpl, nil
}
tmpl := template.New(name)
tmpl, err := tmpl.Parse(markup)
if err != nil {
return tmpl, fmt.Errorf("parseEmailTmpl.Parse: %w", err)
}
emailTmpls[name] = tmpl
return tmpl, nil
}
var textTmpls = map[string]*textTemplate.Template{}
func parseTextTmpl(name string, markup string) (*textTemplate.Template, error) {
if tmpl, ok := textTmpls[name]; ok {
return tmpl, nil
}
tmpl := textTemplate.New(name)
tmpl, err := tmpl.Parse(markup)
if err != nil {
return tmpl, fmt.Errorf("parseTextTmpl.Parse: %w", err)
}
textTmpls[name] = tmpl
return tmpl, nil
}
//go:embed static/*
var staticFS embed.FS
//go:embed migrations/*
var migrationsFS embed.FS
var appWg sync.WaitGroup
var db *sql.DB
var appCtx context.Context
var cancelAppCtx context.CancelFunc
var rwDB *sql.DB
var metaSetup string
var metaName string
var metaDomain string
var metaUnconfirmedDomain string
var metaUnconfirmedDomainProblem string
var metaSSL string
type statusCtxKey struct{}
type pageCtx struct {
Status string
Auth authCtx
Index bool
Name string
HXRequest bool
HXBoosted bool
AdminArea bool
Nav string
UnconfirmedDomainProblem string
UnconfirmedDomain string
HideUnconfirmedDomain bool
ShouldAttemptRedirect bool
Domain string
}
func getPageCtx(r *http.Request) pageCtx {
status := ""
if val, ok := r.Context().Value(statusCtxKey{}).(string); ok {
status = val
}
authCtx := getAuthCtx(r)
adminURLPrefix := ""
adminArea := false
if strings.HasPrefix(r.URL.Path, "/admin/") {
adminURLPrefix = strings.Split(r.URL.Path, "/")[2]
adminArea = true
}
parsedURL, _ := url.ParseRequestURI("https://" + r.Host)
return pageCtx{
Status: status,
Auth: authCtx,
Index: r.URL.Path == "/" || r.URL.Path == "/history",
Name: metaName,
HXRequest: r.Header.Get("HX-Request") == "true",
HXBoosted: r.Header.Get("HX-Boosted") == "true",
AdminArea: adminArea,
Nav: adminURLPrefix,
UnconfirmedDomainProblem: metaUnconfirmedDomainProblem,
UnconfirmedDomain: metaUnconfirmedDomain,
HideUnconfirmedDomain: r.URL.Path == "/admin/settings",
ShouldAttemptRedirect: metaSSL == "true" && authCtx.ID != 0 &&
metaDomain != "" && parsedURL.Hostname() != metaDomain,
Domain: metaDomain,
}
}
func csrfMiddleware(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Method == http.MethodGet || r.Method == http.MethodHead || r.Method == http.MethodOptions {
h.ServeHTTP(w, r)
return
}
csrfToken := r.Header.Get("csrf-token")
authCtx := getAuthCtx(r)
if csrfToken != authCtx.CSRFToken {
w.WriteHeader(http.StatusForbidden)
return
}
h.ServeHTTP(w, r)
})
}
func statusMiddleware(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
tx, err := db.Begin()
if err != nil {
log.Printf("statusMiddleware.Begin: %s", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
severity, err := getSeverity(tx)
if err != nil {
tx.Rollback()
log.Printf("statusMiddleware.getSeverity: %s", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
if err = tx.Commit(); err != nil {
log.Printf("statusMiddleware.Commit: %s", err)
w.WriteHeader(http.StatusInternalServerError)
return
}
ctx := context.WithValue(r.Context(), statusCtxKey{}, severity)
h.ServeHTTP(w, r.WithContext(ctx))
})
}
type authCtxKey struct{}
type authCtx struct {
ID int
CSRFToken string
}
func getAuthCtx(r *http.Request) authCtx {
ctx := authCtx{}
if val, ok := r.Context().Value(authCtxKey{}).(authCtx); ok {
ctx = val
}
return ctx
}
func createMonitorLog(
tx *sql.Tx,
startedAt time.Time,
endedAt time.Time,
responseCode int64,
errorMessage sql.NullString,
attempts int,
result string,
monitorID int,
) (int, error) {
const query = `
insert into
monitor_log(started_at, ended_at, response_code, error_message,
attempts, result, monitor_id)
values(?, ?, ?, ?, ?, ?, ?)
returning id
`
var id int
err := tx.QueryRow(
query,
startedAt,
endedAt,
responseCode,
errorMessage,
attempts,
result,
monitorID,
).Scan(&id)
if err != nil {
return id, fmt.Errorf("createMonitorLog.Exec: %w", err)
}
return id, nil
}
func createMonitorLogLastChecked(
tx *sql.Tx,
startedAt time.Time,
monitorID int,
monitorLogID int,
) error {
const query = `
insert into monitor_log_last_checked(checked_at, monitor_id, monitor_log_id)
values(?, ?, ?)
on conflict(monitor_id) do update set
checked_at = excluded.checked_at,
monitor_log_id = excluded.monitor_log_id
`
_, err := tx.Exec(
query,
startedAt,
monitorID,
monitorLogID,
monitorLogID,
)
if err != nil {
return fmt.Errorf("createMonitorLogLastChecked.Exec: %w", err)
}
return nil
}
type monitorLogLastChecked struct {
ID int
CheckedAt time.Time
ResponseCode sql.NullInt32
}
func getMonitorLogLastChecked(
tx *sql.Tx,
monitorID int,
) (monitorLogLastChecked, error) {
const query = `
select monitor_log.monitor_id, checked_at, monitor_log.response_code
from monitor_log_last_checked
left join monitor_log on monitor_log.id = monitor_log_last_checked.monitor_log_id
where monitor_log_last_checked.monitor_id = ?
`
var lastChecked monitorLogLastChecked
err := tx.QueryRow(query, monitorID).Scan(
&lastChecked.ID,
&lastChecked.CheckedAt,
&lastChecked.ResponseCode,
)
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return lastChecked, nil
}
return lastChecked, fmt.Errorf("getMonitorLogLastChecked.QueryRow: %w", err)
}
return lastChecked, nil
}
func listAllMonitorLogLastChecked(tx *sql.Tx) ([]monitorLogLastChecked, error) {
const query = `
select monitor_log.monitor_id, checked_at, monitor_log.response_code
from monitor_log_last_checked
left join monitor_log on monitor_log.id = monitor_log_last_checked.monitor_log_id
`
var allLastChecked []monitorLogLastChecked
rows, err := tx.Query(query)
if err != nil {
return allLastChecked, fmt.Errorf("listAllMonitorLogLastChecked.Query: %w", err)
}
defer rows.Close()
for rows.Next() {
var lastChecked monitorLogLastChecked
err := rows.Scan(
&lastChecked.ID,
&lastChecked.CheckedAt,
&lastChecked.ResponseCode,
)
if err != nil {
return allLastChecked, fmt.Errorf("listAllMonitorLogLastChecked.Scan: %w", err)
}
allLastChecked = append(allLastChecked, lastChecked)
}
return allLastChecked, nil
}
type plainOrLoginAuth struct {
username string
password string
host string
auth string
}
func PlainOrLoginAuth(username string, password string, host string) smtp.Auth {
return &plainOrLoginAuth{username: username, password: password, host: host}
}
func (a *plainOrLoginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
if !server.TLS {
return "", nil, fmt.Errorf("plainAuth.Start: unencrypted connection")
}
if slices.Contains(server.Auth, "PLAIN") {
a.auth = "PLAIN"
return smtp.PlainAuth("", a.username, a.password, a.host).Start(server)
}
if slices.Contains(server.Auth, "LOGIN") {
a.auth = "LOGIN"
return "LOGIN", []byte(a.username), nil
}
return "", nil, fmt.Errorf("plainAuth.Start: unhandled auth")
}
func (a *plainOrLoginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
if a.auth == "PLAIN" {
return smtp.PlainAuth("", a.username, a.password, a.host).Next(fromServer, more)
}
if a.auth == "LOGIN" && more {
switch string(fromServer) {
case "Username:":
return []byte(a.username), nil
case "Password:":
return []byte(a.password), nil
default:
return nil, fmt.Errorf("plainAuth.Next: unexpected from server")
}
}
return nil, nil
}
func sendMonitorAlertEmail(
monitor Monitor,
channel NotificationChannel,
statusCode sql.NullInt64,
result string,
startedAt time.Time,
emailAddresses []string,
status string,
) error {
smtpDetail, ok := channel.Details.(SMTPNotificationDetails)
if !ok {
return fmt.Errorf(
"sendMonitorAlertEmail.SMTPAssert: failed to assert channel %d",
channel.ID,
)
}
smtpAuth := PlainOrLoginAuth(
smtpDetail.Username,
smtpDetail.Password,
smtpDetail.Host,
)
const downSubject = "🚨 Issue detected on monitor"
const upSubject = "✅ Issue resolved on monitor"
subject := downSubject
if status == "up" {
subject = upSubject
}
msg := [][]byte{
[]byte("Subject: " + subject + " \"" +
monitor.Name + "\""),
[]byte("To: " + strings.Join(emailAddresses, ", ")),
[]byte("From: " + metaName + " " + "<" + smtpDetail.From + ">"),
[]byte("Content-Type: text/html; charset=UTF-8"),
}
for k, v := range smtpDetail.Headers {
if strings.EqualFold(smtpDetail.Host, "smtp.postmarkapp.com") &&
k == "X-PM-Message-Stream" {
continue
}
msg = append(msg, []byte(k+": "+v))
}
if strings.EqualFold(smtpDetail.Host, "smtp.postmarkapp.com") {
msg = append(msg, []byte("X-PM-Message-Stream: "+smtpDetail.Misc["pm-transactional"]))
}
const downMarkup = `
{{- .MonitorName}} started failing<br><br>
{{- if .StatusCode}}
{{- "Status code"}}: {{.StatusCode}}<br>
{{else}}
{{- "Failure reason"}}: {{.Result}}<br>
{{- end}}
{{- "Checked at"}}: {{.CheckedAt}}<br><br>
{{- ""}}<a href="https://{{.Domain}}/admin/monitors/{{.MonitorID}}">View monitor</a>
`
const upMarkup = `
{{- .MonitorName}} started succeeding<br><br>
{{- "Checked at"}}: {{.CheckedAt}}<br><br>
{{- ""}}<a href="https://{{.Domain}}/admin/monitors/{{.MonitorID}}">View monitor</a>
`
markup := downMarkup
if status == "up" {
markup = upMarkup
}
tmpl, err := parseEmailTmpl(status+"MonitorSMTP", markup)
if err != nil {
return fmt.Errorf("sendMonitorAlertEmail.parseEmailTmplsSMTP: %w", err)
}
emailBytes := bytes.Buffer{}
err = tmpl.Execute(
&emailBytes,
struct {
MonitorID int
MonitorName string
StatusCode int
CheckedAt string
Result string
Domain string
}{
MonitorID: monitor.ID,
MonitorName: monitor.Name,
StatusCode: int(statusCode.Int64),
CheckedAt: startedAt.Format("2006/01/02 15:04:05 MST"),
Result: result,
Domain: metaDomain,
},
)
if err != nil {
return fmt.Errorf("sendMonitorAlertEmail.Execute: %w", err)
}
emailStr := "\r\n" + emailBytes.String()
msg = append(msg, []byte(emailStr))
err = smtp.SendMail(
smtpDetail.Host+":"+strconv.Itoa(smtpDetail.Port),
smtpAuth,
smtpDetail.From,
emailAddresses,
bytes.Join(msg, []byte("\r\n")),
)
if err != nil {
return fmt.Errorf("sendMonitorAlertEmail.SendMail: %w", err)
}
return nil
}
func sendMonitorAlertSlack(
monitor Monitor,
channel NotificationChannel,
statusCode sql.NullInt64,
startedAt time.Time,
result string,
httpClient http.Client,
status string,
domain string,
) error {
slackDetail, ok := channel.Details.(SlackNotificationDetails)
if !ok {
return fmt.Errorf(
"sendMonitorAlertSlack.SlackAssert: failed to assert channel %d",
channel.ID,
)
}
const downMarkup = `
{{- ":rotating_light:"}} {{.MonitorName}} started failing{{"\n\n"}}