http-slog.go

// Copyright 2017 Inca Roads LLC.  All rights reserved.
// Use of this source code is governed by licenses granted by the
// copyright holder including that found in the LICENSE file.

// Inbound support for the "/server-log/<instanceid>" HTTP topic
package main

import (
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
)

// Handle inbound HTTP requests to fetch log files
func inboundWebServerLogHandler(rw http.ResponseWriter, req *http.Request) {
	stats.Count.HTTP++

	// Set response mime type
	rw.Header().Set("Content-Type", "text/plain")

	// Log it
	fn := req.RequestURI[len(TTServerTopicServerLog):]
	fmt.Printf("%s instance information request for %s\n", LogTime(), fn)

	// Crack the secret
	Str := strings.Split(fn, "$")
	if len(Str) != 2 {
		fmt.Printf("%s Badly formatted instance request\n", LogTime())
		io.WriteString(rw, "No such server instance.")
		return
	}
	secret := Str[0]
	filename := Str[1]
	if secret != ServerLogSecret() {
		fmt.Printf("%s Ssecret %s != %s\n", LogTime(), secret, ServerLogSecret())
		io.WriteString(rw, "This link to server log has expired.")
		return
	}

	// Open the file
	file := SafecastDirectory() + TTServerLogPath + "/" + filename
	fd, err := os.Open(file)
	if err != nil {
		io.WriteString(rw, ErrorString(err))
		return
	}
	defer fd.Close()

	// Copy the file to output
	io.Copy(rw, fd)

}