element-web/scripts/rageshake.go

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// Run a web server capable of dumping bug reports sent by Riot.
// Requires Go 1.5+
// Usage: BUGS_USER=user BUGS_PASS=password go run rageshake.go PORT
// Example: BUGS_USER=alice BUGS_PASS=secret go run rageshake.go 8080
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package main
import (
"bytes"
"compress/gzip"
"crypto/subtle"
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"encoding/json"
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"fmt"
"io/ioutil"
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"log"
"net/http"
"os"
"path/filepath"
"strconv"
"time"
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)
var maxPayloadSize = 1024 * 1024 * 55 // 55 MB
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type LogEntry struct {
ID string `json:"id"`
Lines string `json:"lines"`
}
type Payload struct {
Text string `json:"text"`
Version string `json:"version"`
UserAgent string `json:"user_agent"`
Logs []LogEntry `json:"logs"`
}
func respond(code int, w http.ResponseWriter) {
w.WriteHeader(code)
w.Write([]byte("{}"))
}
func gzipAndSave(data []byte, dirname, fpath string) error {
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_ = os.MkdirAll(filepath.Join("bugs", dirname), os.ModePerm)
fpath = filepath.Join("bugs", dirname, fpath)
if _, err := os.Stat(fpath); err == nil {
return fmt.Errorf("file already exists") // the user can just retry
}
var b bytes.Buffer
gz := gzip.NewWriter(&b)
if _, err := gz.Write(data); err != nil {
return err
}
if err := gz.Flush(); err != nil {
return err
}
if err := gz.Close(); err != nil {
return err
}
if err := ioutil.WriteFile(fpath, b.Bytes(), 0644); err != nil {
return err
}
return nil
}
func basicAuth(handler http.Handler, username, password, realm string) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
user, pass, ok := r.BasicAuth() // pull creds from the request
// check user and pass securely
if !ok || subtle.ConstantTimeCompare([]byte(user), []byte(username)) != 1 || subtle.ConstantTimeCompare([]byte(pass), []byte(password)) != 1 {
w.Header().Set("WWW-Authenticate", `Basic realm="`+realm+`"`)
w.WriteHeader(401)
w.Write([]byte("Unauthorised.\n"))
return
}
handler.ServeHTTP(w, r)
})
}
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func main() {
http.HandleFunc("/api/submit", func(w http.ResponseWriter, req *http.Request) {
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if req.Method != "POST" && req.Method != "OPTIONS" {
respond(405, w)
return
}
// Set CORS
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS")
w.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept")
if req.Method == "OPTIONS" {
respond(200, w)
return
}
if length, err := strconv.Atoi(req.Header.Get("Content-Length")); err != nil || length > maxPayloadSize {
respond(413, w)
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return
}
var p Payload
if err := json.NewDecoder(req.Body).Decode(&p); err != nil {
respond(400, w)
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return
}
// Dump bug report to disk as form:
// "bugreport-20170115-112233.log.gz" => user text, version, user agent, # logs
// "bugreport-20170115-112233-0.log.gz" => most recent log
// "bugreport-20170115-112233-1.log.gz" => ...
// "bugreport-20170115-112233-N.log.gz" => oldest log
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t := time.Now().UTC()
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prefix := t.Format("2006-01-02/150405")
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summary := fmt.Sprintf(
"%s\n\nNumber of logs: %d\nVersion: %s\nUser-Agent: %s\n", p.Text, len(p.Logs), p.Version, p.UserAgent,
)
if err := gzipAndSave([]byte(summary), prefix, "details.log.gz"); err != nil {
respond(500, w)
return
}
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for i, log := range p.Logs {
if err := gzipAndSave([]byte(log.Lines), prefix, fmt.Sprintf("logs-%d.log.gz", i)); err != nil {
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respond(500, w)
return // TODO: Rollback?
}
}
respond(200, w)
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})
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// Make sure bugs directory exists
_ = os.Mkdir("bugs", os.ModePerm)
// serve files under "bugs"
fs := http.FileServer(http.Dir("bugs"))
fs = http.StripPrefix("/api/listing/", fs)
// set auth if env vars exist
usr := os.Getenv("BUGS_USER")
pass := os.Getenv("BUGS_PASS")
if usr == "" || pass == "" {
fmt.Println("BUGS_USER and BUGS_PASS env vars not found. No authentication is running for /api/listing")
} else {
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fs = basicAuth(fs, usr, pass, "Riot bug reports")
}
http.Handle("/api/listing/", fs)
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port := os.Args[1]
log.Fatal(http.ListenAndServe(":"+port, nil))
}