gzip bug reports when storing on disk. Set max payload size

scripts/rageshake.go

@@ -5,13 +5,19 @@
 package main
 
 import (
+	"bytes"
+	"compress/gzip"
 	"encoding/json"
-	"fmt"
+	"io/ioutil"
 	"log"
 	"net/http"
 	"os"
+	"strconv"
+	"time"
 )
 
+var maxPayloadSize = 1024 * 1024 * 55 // 55 MB
+
 type LogEntry struct {
 	ID    string `json:"id"`
 	Lines string `json:"lines"`
@@ -24,28 +30,64 @@ type Payload struct {
 	Logs      []LogEntry `json:"logs"`
 }
 
+func respond(code int, w http.ResponseWriter) {
+	w.WriteHeader(code)
+	w.Write([]byte("{}"))
+}
+
+func gzipAndSave(data []byte, filepath string) error {
+	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(filepath, b.Bytes(), 0644); err != nil {
+		return err
+	}
+	return nil
+}
+
 func main() {
 	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
 		if req.Method != "POST" && req.Method != "OPTIONS" {
-			w.WriteHeader(405)
+			respond(405, w)
 			return
 		}
 		// Set CORS
 		w.Header().Set("Access-Control-Allow-Origin", "*")
-        w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
+		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" {
-            return;
+			respond(200, w)
+			return
+		}
+		if length, err := strconv.Atoi(req.Header.Get("Content-Length")); err != nil || length > maxPayloadSize {
+			respond(413, w)
+			return
 		}
 		var p Payload
 		if err := json.NewDecoder(req.Body).Decode(&p); err != nil {
-			w.WriteHeader(400)
-			w.Write([]byte("Body is not JSON"))
+			respond(400, w)
 			return
 		}
-        // Dump bug report to disk
-		fmt.Println(p)
-
+		// 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
+		t := time.Now()
+		prefix := t.Format("bugreport-20060102-150405")
+		if err := gzipAndSave([]byte(p.Text), prefix+".log.gz"); err != nil {
+			respond(500, w)
+			return
+		}
+		respond(200, w)
 	})
 
 	port := os.Args[1]