142 lines
3.7 KiB
Go
142 lines
3.7 KiB
Go
// Copyright (C) 2019 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package main
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import (
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"bytes"
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"compress/gzip"
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"io"
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"log"
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"net/http"
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"os"
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"path"
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"path/filepath"
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"strings"
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)
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type crashReceiver struct {
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dir string
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dsn string
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}
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func (r *crashReceiver) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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// The final path component should be a SHA256 hash in hex, so 64 hex
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// characters. We don't care about case on the request but use lower
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// case internally.
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reportID := strings.ToLower(path.Base(req.URL.Path))
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if len(reportID) != 64 {
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http.Error(w, "Bad request", http.StatusBadRequest)
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return
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}
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for _, c := range reportID {
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if c >= 'a' && c <= 'f' {
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continue
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}
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if c >= '0' && c <= '9' {
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continue
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}
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http.Error(w, "Bad request", http.StatusBadRequest)
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return
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}
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// The location of the report on disk, compressed
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fullPath := filepath.Join(r.dir, r.dirFor(reportID), reportID) + ".gz"
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switch req.Method {
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case http.MethodGet:
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r.serveGet(fullPath, w, req)
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case http.MethodHead:
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r.serveHead(fullPath, w, req)
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case http.MethodPut:
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r.servePut(reportID, fullPath, w, req)
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default:
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http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
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}
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}
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// serveGet responds to GET requests by serving the uncompressed report.
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func (r *crashReceiver) serveGet(fullPath string, w http.ResponseWriter, _ *http.Request) {
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fd, err := os.Open(fullPath)
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if err != nil {
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http.Error(w, "Not found", http.StatusNotFound)
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return
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}
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defer fd.Close()
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gr, err := gzip.NewReader(fd)
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if err != nil {
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http.Error(w, "Internal server error", http.StatusInternalServerError)
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return
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}
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_, _ = io.Copy(w, gr) // best effort
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}
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// serveHead responds to HEAD requests by checking if the named report
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// already exists in the system.
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func (r *crashReceiver) serveHead(fullPath string, w http.ResponseWriter, _ *http.Request) {
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if _, err := os.Lstat(fullPath); err != nil {
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http.Error(w, "Not found", http.StatusNotFound)
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}
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}
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// servePut accepts and stores the given report.
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func (r *crashReceiver) servePut(reportID, fullPath string, w http.ResponseWriter, req *http.Request) {
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// Ensure the destination directory exists
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if err := os.MkdirAll(filepath.Dir(fullPath), 0755); err != nil {
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log.Println("Creating directory:", err)
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http.Error(w, "Internal server error", http.StatusInternalServerError)
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return
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}
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// Read at most maxRequestSize of report data.
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log.Println("Receiving report", reportID)
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lr := io.LimitReader(req.Body, maxRequestSize)
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bs, err := io.ReadAll(lr)
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if err != nil {
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log.Println("Reading report:", err)
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http.Error(w, "Internal server error", http.StatusInternalServerError)
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return
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}
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// Compress the report for storage
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buf := new(bytes.Buffer)
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gw := gzip.NewWriter(buf)
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_, _ = gw.Write(bs) // can't fail
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gw.Close()
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// Create an output file with the compressed report
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err = os.WriteFile(fullPath, buf.Bytes(), 0644)
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if err != nil {
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log.Println("Saving report:", err)
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http.Error(w, "Internal server error", http.StatusInternalServerError)
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return
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}
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// Send the report to Sentry
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if r.dsn != "" {
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// Remote ID
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user := userIDFor(req)
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go func() {
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// There's no need for the client to have to wait for this part.
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pkt, err := parseCrashReport(reportID, bs)
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if err != nil {
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log.Println("Failed to parse crash report:", err)
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return
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}
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if err := sendReport(r.dsn, pkt, user); err != nil {
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log.Println("Failed to send crash report:", err)
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}
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}()
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}
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}
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// 01234567890abcdef... => 01/23
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func (r *crashReceiver) dirFor(base string) string {
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return filepath.Join(base[0:2], base[2:4])
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}
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