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1 | <?php | |
2 | ||
3 | namespace Shaarli\Api; | |
4 | ||
5 | use Shaarli\Api\Exceptions\ApiAuthorizationException; | |
6 | use Shaarli\Bookmark\Bookmark; | |
7 | use Shaarli\Http\Base64Url; | |
8 | ||
9 | /** | |
10 | * REST API utilities | |
11 | */ | |
12 | class ApiUtils | |
13 | { | |
14 | /** | |
15 | * Validates a JWT token authenticity. | |
16 | * | |
17 | * @param string $token JWT token extracted from the headers. | |
18 | * @param string $secret API secret set in the settings. | |
19 | * | |
20 | * @return bool true on success | |
21 | * | |
22 | * @throws ApiAuthorizationException the token is not valid. | |
23 | */ | |
24 | public static function validateJwtToken($token, $secret) | |
25 | { | |
26 | $parts = explode('.', $token); | |
27 | if (count($parts) != 3 || strlen($parts[0]) == 0 || strlen($parts[1]) == 0) { | |
28 | throw new ApiAuthorizationException('Malformed JWT token'); | |
29 | } | |
30 | ||
31 | $genSign = Base64Url::encode(hash_hmac('sha512', $parts[0] . '.' . $parts[1], $secret, true)); | |
32 | if ($parts[2] != $genSign) { | |
33 | throw new ApiAuthorizationException('Invalid JWT signature'); | |
34 | } | |
35 | ||
36 | $header = json_decode(Base64Url::decode($parts[0])); | |
37 | if ($header === null) { | |
38 | throw new ApiAuthorizationException('Invalid JWT header'); | |
39 | } | |
40 | ||
41 | $payload = json_decode(Base64Url::decode($parts[1])); | |
42 | if ($payload === null) { | |
43 | throw new ApiAuthorizationException('Invalid JWT payload'); | |
44 | } | |
45 | ||
46 | if ( | |
47 | empty($payload->iat) | |
48 | || $payload->iat > time() | |
49 | || time() - $payload->iat > ApiMiddleware::$TOKEN_DURATION | |
50 | ) { | |
51 | throw new ApiAuthorizationException('Invalid JWT issued time'); | |
52 | } | |
53 | ||
54 | return true; | |
55 | } | |
56 | ||
57 | /** | |
58 | * Format a Link for the REST API. | |
59 | * | |
60 | * @param Bookmark $bookmark Bookmark data read from the datastore. | |
61 | * @param string $indexUrl Shaarli's index URL (used for relative URL). | |
62 | * | |
63 | * @return array Link data formatted for the REST API. | |
64 | */ | |
65 | public static function formatLink($bookmark, $indexUrl) | |
66 | { | |
67 | $out['id'] = $bookmark->getId(); | |
68 | // Not an internal link | |
69 | if (! $bookmark->isNote()) { | |
70 | $out['url'] = $bookmark->getUrl(); | |
71 | } else { | |
72 | $out['url'] = rtrim($indexUrl, '/') . '/' . ltrim($bookmark->getUrl(), '/'); | |
73 | } | |
74 | $out['shorturl'] = $bookmark->getShortUrl(); | |
75 | $out['title'] = $bookmark->getTitle(); | |
76 | $out['description'] = $bookmark->getDescription(); | |
77 | $out['tags'] = $bookmark->getTags(); | |
78 | $out['private'] = $bookmark->isPrivate(); | |
79 | $out['created'] = $bookmark->getCreated()->format(\DateTime::ATOM); | |
80 | if (! empty($bookmark->getUpdated())) { | |
81 | $out['updated'] = $bookmark->getUpdated()->format(\DateTime::ATOM); | |
82 | } else { | |
83 | $out['updated'] = ''; | |
84 | } | |
85 | return $out; | |
86 | } | |
87 | ||
88 | /** | |
89 | * Convert a link given through a request, to a valid Bookmark for the datastore. | |
90 | * | |
91 | * If no URL is provided, it will generate a local note URL. | |
92 | * If no title is provided, it will use the URL as title. | |
93 | * | |
94 | * @param array|null $input Request Link. | |
95 | * @param bool $defaultPrivate Setting defined if a bookmark is private by default. | |
96 | * | |
97 | * @return Bookmark instance. | |
98 | */ | |
99 | public static function buildBookmarkFromRequest(?array $input, bool $defaultPrivate): Bookmark | |
100 | { | |
101 | $bookmark = new Bookmark(); | |
102 | $url = ! empty($input['url']) ? cleanup_url($input['url']) : ''; | |
103 | if (isset($input['private'])) { | |
104 | $private = filter_var($input['private'], FILTER_VALIDATE_BOOLEAN); | |
105 | } else { | |
106 | $private = $defaultPrivate; | |
107 | } | |
108 | ||
109 | $bookmark->setTitle(! empty($input['title']) ? $input['title'] : ''); | |
110 | $bookmark->setUrl($url); | |
111 | $bookmark->setDescription(! empty($input['description']) ? $input['description'] : ''); | |
112 | $bookmark->setTags(! empty($input['tags']) ? $input['tags'] : []); | |
113 | $bookmark->setPrivate($private); | |
114 | ||
115 | $created = \DateTime::createFromFormat(\DateTime::ATOM, $input['created'] ?? ''); | |
116 | if ($created instanceof \DateTimeInterface) { | |
117 | $bookmark->setCreated($created); | |
118 | } | |
119 | $updated = \DateTime::createFromFormat(\DateTime::ATOM, $input['updated'] ?? ''); | |
120 | if ($updated instanceof \DateTimeInterface) { | |
121 | $bookmark->setUpdated($updated); | |
122 | } | |
123 | ||
124 | return $bookmark; | |
125 | } | |
126 | ||
127 | /** | |
128 | * Update link fields using an updated link object. | |
129 | * | |
130 | * @param Bookmark $oldLink data | |
131 | * @param Bookmark $newLink data | |
132 | * | |
133 | * @return Bookmark $oldLink updated with $newLink values | |
134 | */ | |
135 | public static function updateLink($oldLink, $newLink) | |
136 | { | |
137 | $oldLink->setTitle($newLink->getTitle()); | |
138 | $oldLink->setUrl($newLink->getUrl()); | |
139 | $oldLink->setDescription($newLink->getDescription()); | |
140 | $oldLink->setTags($newLink->getTags()); | |
141 | $oldLink->setPrivate($newLink->isPrivate()); | |
142 | ||
143 | return $oldLink; | |
144 | } | |
145 | ||
146 | /** | |
147 | * Format a Tag for the REST API. | |
148 | * | |
149 | * @param string $tag Tag name | |
150 | * @param int $occurrences Number of bookmarks using this tag | |
151 | * | |
152 | * @return array Link data formatted for the REST API. | |
153 | */ | |
154 | public static function formatTag($tag, $occurences) | |
155 | { | |
156 | return [ | |
157 | 'name' => $tag, | |
158 | 'occurrences' => $occurences, | |
159 | ]; | |
160 | } | |
161 | } |