http.go

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

// Common support for all HTTP topic handlers
package main

import (
	"fmt"
	"net/http"
	"net/url"
	"strings"
)

// HTTPInboundHandler kicks off inbound messages coming from all sources, then serve HTTP
func HTTPInboundHandler(port string) {

	// Topics
	http.HandleFunc("/github", inboundWebGithubHandler)
	http.HandleFunc("/ping", inboundWebPingHandler)
	http.HandleFunc("/echo", inboundWebEchoHandler)
	http.HandleFunc("/audio", inboundWebAudioHandler)
	http.HandleFunc("/audio/", inboundWebAudioHandler)
	http.HandleFunc("/api", inboundWebAPIHandler)
	http.HandleFunc("/send", inboundWebSendHandler)
	http.HandleFunc("/proxy", inboundWebProxyHandler)
	http.HandleFunc("/robots.txt", inboundWebPingHandler)
	http.HandleFunc("/env", inboundWebEnvHandler)
	http.HandleFunc("/lorawan", inboundWebLoRaWANHandler)
	http.HandleFunc("/", inboundWebRootHandler)

	// HTTP
	fmt.Printf("Now handling inbound HTTP on %s\n", port)
	go http.ListenAndServe(port, nil)

}

// HTTPArgs parses the request URI and returns interesting things
func HTTPArgs(req *http.Request, topic string) (target string, args map[string]string) {
	args = map[string]string{}

	// Trim the request URI
	target = req.RequestURI[len(topic):]

	// If nothing left, there were no args
	if len(target) == 0 {
		return
	}

	// Make sure that the prefix is "/", else the pattern matcher is matching something we don't want
	target = strings.TrimPrefix(target, "/")

	// See if there is a query, and if so process it
	str := strings.SplitN(target, "?", 2)
	if len(str) == 1 {
		return
	}

	// Now that we know we have args, parse them
	target = str[0]
	values, err := url.ParseQuery(str[1])
	if err != nil {
		return
	}

	// Generate the return arg in the format we expect
	for k, v := range values {
		if len(v) == 1 {
			args[k] = strings.TrimSuffix(strings.TrimPrefix(v[0], "\""), "\"")
		}
	}

	// Done
	return

}