bus-pos.php

<?php
# 範例參數：
# bus-pos.php?line=Taichung/151
# 其他城市名稱請見 

$QS = array_key_exists('QUERY_STRING', $_SERVER) ? $_SERVER["QUERY_STRING"] : '';
parse_str($QS, $Q);
# $Q = array(
#     'line' => 'Taichung/151'
# );

# https://github.com/tdxmotc/SampleCode
$TDX_TOKEN_DIR = "/home/ckhung/cred/tdx";
$token = json_decode(file_get_contents("$TDX_TOKEN_DIR/tdx-credential.json"), true)['access_token'];

$opts = [
    'http' => [
        'method' => 'GET',
        'header' => "authorization: Bearer $token"
    ]
];

$ret = json_decode(file_get_contents(
    "https://tdx.transportdata.tw/api/basic/v2/Bus/RealTimeByFrequency/City/$Q[line]?\$format=JSON", false, stream_context_create($opts)
), true);

$ret = array_map( function($v) {
    return [
	"type" => "Feature",
	"properties" => [
	    "name" => $v["PlateNumb"],
	    "Azimuth" => $v["Azimuth"],
	],
	"geometry" => [
	    "type" => "Point",
	    "coordinates" => [
		$v["BusPosition"]["PositionLon"],
		$v["BusPosition"]["PositionLat"],
	    ]
	]
    ];
}, $ret);

$ret = json_encode([
    "type" => "FeatureCollection",
    "features" => $ret
]);

# firefox 認得 json
# https://developer.mozilla.org/en-US/docs/Tools/JSON_viewer
# 但不認得 geojson
# header('Content-Type: application/vnd.geo+json');
header('Content-Type: application/json');
print $ret;

# 另外 apache2 可能還需要設定 CORS：
# 在 /etc/apache2/sites-available/000-default.conf 裡面加入
# Header set Access-Control-Allow-Origin "*"
# a2enmod headers
# systemctl restart apache2.service


?>

tdx-credential.sh

#!/bin/bash

export TDX_TOKEN_DIR=$HOME/.cache/tdx/
mkdir -p $TDX_TOKEN_DIR

env > $TDX_TOKEN_DIR/env.txt

curl --request POST \
    --url 'https://tdx.transportdata.tw/auth/realms/TDXConnect/protocol/openid-connect/token' \
    --header content-type:application/x-www-form-urlencoded \
    --data grant_type=client_credentials \
    --data client_id=xxxxxx-xxxxxxxx-xxxx-xxxx \
    --data client_secret=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx \
    > $TDX_TOKEN_DIR/tdx-credential.json

export TDX_ACCESS_TOKEN=$(jq .access_token $TDX_TOKEN_DIR/tdx-credential.json | sed 's/"//g')