prosody-modules
0f5f2d4475b9
mod_http_upload_external/share.php

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mod_http_upload_external/share.php @ 4876:0f5f2d4475b9

mod_http_xep227: Add support for import via APIs rather than direct store manipulation In particular this transitions PEP nodes and data to be imported via mod_pep's APIs, fixing issues with importing at runtime while PEP data may already be live in RAM. Next obvious candidate for this approach is rosters, so clients get immediate roster pushes and other special handling (such as emitting subscribes to reach the desired subscription state).
author Matthew Wild <mwild1@gmail.com>
date Tue, 18 Jan 2022 17:01:18 +0000
parent 4310:b0ad1604f77e
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1 <?php
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2
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3 /*
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4 PHP script to handle file uploads and downloads for Prosody's mod_http_upload_external
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5
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6 Tested with Apache 2.2+ and PHP 5.3+
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7
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8 ** Why this script?
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9
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10 This script only allows uploads that have been authorized by mod_http_upload_external. It
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11 attempts to make the upload/download as safe as possible, considering that there are *many*
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12 security concerns involved with allowing arbitrary file upload/download on a web server.
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13
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14 With that said, I do not consider myself a PHP developer, and at the time of writing, this
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15 code has had no external review. Use it at your own risk. I make no claims that this code
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16 is secure.
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17
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18 ** How to use?
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19
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20 Drop this file somewhere it will be served by your web server. Edit the config options below.
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21
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22 In Prosody set:
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23
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24 http_upload_external_base_url = "https://your.example.com/path/to/share.php/"
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25 http_upload_external_secret = "this is your secret string"
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26
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27 ** License
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28
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29 (C) 2016 Matthew Wild <mwild1@gmail.com>
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30
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31 Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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32 and associated documentation files (the "Software"), to deal in the Software without restriction,
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33 including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
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34 and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
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35 subject to the following conditions:
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36
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37 The above copyright notice and this permission notice shall be included in all copies or substantial
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38 portions of the Software.
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39
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40 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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41 BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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42 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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43 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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44 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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45
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46 */
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47
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48 /*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
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49 /* CONFIGURATION OPTIONS */
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50 /*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
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51
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52 /* Change this to a directory that is writable by your web server, but is outside your web root */
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53 $CONFIG_STORE_DIR = '/tmp';
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54
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55 /* This must be the same as 'http_upload_external_secret' that you set in Prosody's config file */
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56 $CONFIG_SECRET = 'this is your secret string';
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57
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58 /* For people who need options to tweak that they don't understand... here you are */
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59 $CONFIG_CHUNK_SIZE = 4096;
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60
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61 /*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
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62 /* END OF CONFIGURATION */
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63 /*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
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64
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65 /* Do not edit below this line unless you know what you are doing (spoiler: nobody does) */
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66
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67 $upload_file_name = substr($_SERVER['PHP_SELF'], strlen($_SERVER['SCRIPT_NAME'])+1);
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68 $store_file_name = $CONFIG_STORE_DIR . '/store-' . hash('sha256', $upload_file_name);
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69
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70 $request_method = $_SERVER['REQUEST_METHOD'];
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71
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72 /* Set CORS headers */
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73 header('Access-Control-Allow-Methods: GET, PUT, OPTIONS');
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74 header('Access-Control-Allow-Headers: Content-Type');
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75 header('Access-Control-Max-Age: 7200');
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76 header('Access-Control-Allow-Origin: *');
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77
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78 if(array_key_exists('v', $_GET) === TRUE && $request_method === 'PUT') {
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79 $upload_file_size = $_SERVER['CONTENT_LENGTH'];
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80 $upload_token = $_GET['v'];
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81
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82 $calculated_token = hash_hmac('sha256', "$upload_file_name $upload_file_size", $CONFIG_SECRET);
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83 if(function_exists('hash_equals')) {
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84 if(hash_equals($calculated_token, $upload_token) !== TRUE) {
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85 error_log("Token mismatch: calculated $calculated_token got $upload_token");
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86 header('HTTP/1.0 403 Forbidden');
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87 exit;
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88 }
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89 }
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90 else {
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91 if($upload_token !== $calculated_token) {
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92 error_log("Token mismatch: calculated $calculated_token got $upload_token");
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93 header('HTTP/1.0 403 Forbidden');
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94 exit;
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95 }
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96 }
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97 /* Open a file for writing */
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98 $store_file = fopen($store_file_name, 'x');
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99
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100 if($store_file === FALSE) {
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101 header('HTTP/1.0 409 Conflict');
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102 exit;
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103 }
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104
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105 /* PUT data comes in on the stdin stream */
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106 $incoming_data = fopen('php://input', 'r');
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107
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108 /* Read the data a chunk at a time and write to the file */
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109 while ($data = fread($incoming_data, $CONFIG_CHUNK_SIZE)) {
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110 fwrite($store_file, $data);
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111 }
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112
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113 /* Close the streams */
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114 fclose($incoming_data);
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115 fclose($store_file);
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116
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117 // https://xmpp.org/extensions/xep-0363.html#upload
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118 // A HTTP status Code of 201 means that the server is now ready to serve the file via the provided GET URL.
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119 header('HTTP/1.0 201 Created');
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120 exit;
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121 } else if($request_method === 'GET' || $request_method === 'HEAD') {
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122 // Send file (using X-Sendfile would be nice here...)
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123 if(file_exists($store_file_name)) {
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124 header('Content-Disposition: attachment');
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125 header('Content-Type: application/octet-stream');
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126 header('Content-Length: '.filesize($store_file_name));
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127 header("Content-Security-Policy: \"default-src 'none'\"");
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128 header("X-Content-Security-Policy: \"default-src 'none'\"");
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129 header("X-WebKit-CSP: \"default-src 'none'\"");
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130 if($request_method !== 'HEAD') {
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131 readfile($store_file_name);
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132 }
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133 } else {
f86478a02b25 mod_http_upload_external: Add share.php example implementation
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134 header('HTTP/1.0 404 Not Found');
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135 }
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3b13f19652e2 mod_http_upload_external: Update share.php and share_v2.php to allow cross-domain requests
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136 } else if($request_method === 'OPTIONS') {
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137 } else {
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138 header('HTTP/1.0 400 Bad Request');
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139 }
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140
f86478a02b25 mod_http_upload_external: Add share.php example implementation
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141 exit;