311 lines
12 KiB
PHP
311 lines
12 KiB
PHP
<?php
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function create_new_user($username, $sharephrase, $password, $errorhandler = 'default_error_handler') {
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if (isset($username) && $username != "" && isset($sharephrase) && $sharephrase != "" && isset($password) && $password != "") {
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//check for valid username
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$disallowed = array("con", "prn", "aux", "nul", "com", "do", "done", "elif", "else", "esac", "fi", "for", "function", "if", "in", "select", "then", "until", "while", "time");
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$username = strtolower($username);
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if (preg_match('/[^a-z]/', $username))
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{
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$errorhandler("username not valid: must be one word, alphabetic characters only");
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return;
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}
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if (in_array($username, $disallowed)) {
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$errorhandler("username not valid - must not be OS reserved word");
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return;
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}
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//check for valid sharephrase
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$sharephrase = strtolower($sharephrase);
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if (preg_match('/[^a-z ]/', $sharephrase))
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{
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$errorhandler("sharephrase not valid - use combinations provided by service");
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return;
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}
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//check for valid password
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$password = strtolower($password);
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if (preg_match('/[^A-Za-z0-9 ]/', $password))
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{
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$errorhandler("password not valid - use only letters, numbers and spaces");
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return;
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} else {
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$password = base64_encode($password);
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}
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//re-run the username uniqueness check
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if (file_exists("data/" . $username)) {
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$errorhandler("user or service name already in use");
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return;
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}
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//try create the folder
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if (!is_dir("data")){
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$errorhandler("data folder could not be found on server");
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return;
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} else {
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try {
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mkdir("data/" . $username);
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}
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catch (exception $e)
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{
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$errorhandler("could not create user storage; check permissions on server.");
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return;
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}
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}
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//try create the data file
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try {
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//Load the template, populate this user's values, and save as a new file
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$newfile = "data/" . $username . "/sharelog.json";
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$templatefile = file_get_contents("sharelog-template.json");
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$templatedata = json_decode($templatefile);
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$templatedata->sharephrase = $sharephrase;
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$templatedata->password = $password;
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if (isset($sharetype)) {
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$req_sharetype = strtolower($sharetype);
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if (in_array($req_sharetype, $supported_content_types))
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$templatedata->sharetype = $sharetype;
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}
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$written = file_put_contents($newfile, json_encode($templatedata, JSON_PRETTY_PRINT));
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}
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catch (exception $e)
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{
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$errorhandler("could not create sharelog in user storage; check for valid template and permissions on server");
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return;
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}
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return "{\"success\":\"new user created!\"}";
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} else {
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$errorhandler("post data payload incomplete, missing username, sharephrase or password");
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return;
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}
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return;
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}
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function add_share_text($postdata, $username, $credential, $reqtype, $errorhandler = 'default_error_handler') {
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global $supported_content_types;
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//Make sure the file exists and can be loaded
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$sharedata = get_share_data($username, $credential, $errorhandler);
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//Make sure this share content is valid and allowed
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$allowedtype = $sharedata['sharetype'];
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if (!in_array($reqtype, $supported_content_types)) {
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$errorhandler("shared content-type, " . $reqtype . ", not supported by this service"); //TODO: could list
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}
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if ($reqtype == "text/plain") {
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if ($allowedtype != "all" && $allowedtype != "string" && $allowedtype != "text/plain")
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$errorhandler("shared content-type not allowed; this user or service instance only allows ". $allowedtype);
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}
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else if ($reqtype == "application/json") {
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if ($allowedtype != "all" && $allowedtype != "string" && $allowedtype != "application/json")
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$errorhandler("shared content-type not allowed; this user or service instance only allows ". $allowedtype);
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else {
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//Make sure we're not getting junk
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if (!is_JSON($postdata)) {
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$errorhandler("posted json could not be parsed; it may be too long or malformed");
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} else {
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$postdata = json_decode($postdata);
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}
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}
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}
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else {
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$errorhandler("shared content-type not allowed on this endpoint");
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}
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//Get and update share file
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$newshareitem = make_share_item($postdata, $reqtype);
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$updatedsharedata = add_share_item($newshareitem, $sharedata, $username, $credential, $errorhandler);
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if (isset($updatedsharedata)) {
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$file = "data/" . strtolower($username) . "/sharelog.json";
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$written = file_put_contents($file, json_encode($updatedsharedata, JSON_PRETTY_PRINT));
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//Output the results
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if (!$written) {
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$errorhandler("failed to write to file " . $file);
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} else {
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return $newshareitem;
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}
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} else {
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$errorhandler("failed to build new share data in add_share_text");
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}
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}
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function upload_share_file($username, $credential, $fileItem, $errorhandler) {
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global $config;
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global $supported_content_types;
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if($fileItem['name'])
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{
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if(!$fileItem['error'])
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{
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//Make sure the share exists and can be loaded
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$sharedata = get_share_data($username, $credential, $errorhandler);
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if ($sharedata) {
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$valid_file = true;
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//Make sure the uploaded image is allowed
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if($fileItem['size'] > ($config['maximagesize'])) {
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$errorhandler("image is too large to share here; reduce the file size to be less than " . ($config['maximagesize'] / 1024000) . " MB");
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$valid_file = false;
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}
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if (!in_array($fileItem['type'], $supported_content_types)) {
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$errorhandler("upload file type, " . $fileItem['type'] . ", is not allowed by this user or service instance");
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$valid_file = false;
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}
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$allowedtype = $sharedata['sharetype'];
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if ($allowedtype != "all" && strrpos($allowedtype, "image") === false)
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$errorhandler("user or service instance does not allow images");
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if ($valid_file) {
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$newid = short_uniqid();
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$newfile = $newid . ".";
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switch ($fileItem['type']){
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case "image/gif":
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$newfile = $newfile . "gif";
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break;
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case "image/jpeg":
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$newfile = $newfile . "jpg";
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break;
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case "image/png":
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$newfile = $newfile . "png";
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break;
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}
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$newfile = "data/" . $username . "/" . $newfile;
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//Move the image into place
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if (move_uploaded_file($fileItem['tmp_name'], $newfile)) {
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//Make a new share item and add to users share file
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$newshareitem = make_share_item($newfile, $fileItem['type'], $newid);
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$updatedsharedata = add_share_item($newshareitem, $sharedata, $username, $credential, $errorhandler);
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if (isset($updatedsharedata) && $updatedsharedata != "") {
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$file = "data/" . strtolower($username) . "/sharelog.json";
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$written = file_put_contents($file, json_encode($updatedsharedata, JSON_PRETTY_PRINT));
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return $newshareitem;
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}
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} else {
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$errorhandler("could not move uploaded file to share directory; check server permissions");
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}
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}
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}
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}
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else
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{
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$errorhandler("a server error occurred uploading file (code: " . $fileItem['error'] . "); file may be too big, or the server may be misconfigured.");
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}
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}
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return;
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}
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function make_share_item($itemcontent, $contenttype, $newid) {
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if (!isset($newid))
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$newid = short_uniqid();
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//calculate time stamp
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$now = new DateTime("now", new DateTimeZone("UTC"));
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$now = $now->format('Y-m-d H:i:s');
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$newshareentry = new stdClass();
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$newshareentry->guid = $newid;
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$newshareentry->contenttype = $contenttype;
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$newshareentry->content = $itemcontent;
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$newshareentry->timestamp = $now;
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return $newshareentry;
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}
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function add_share_item($newshareentry, $oldsharedata, $username, $credential, $errorhandler = 'default_error_handler') {
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global $config;
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if (!isset($newshareentry) || !isset($oldsharedata) || !isset($username) || !isset($credential)) {
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$errorhandler("add share item function call missing required parameters");
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return;
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}
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if (($oldsharedata['sharephrase'] != $credential && base64_decode($oldsharedata['password']) != $credential) || $credential == $config['readonlykey']) {
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$errorhandler("credentials not valid or read-only");
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return;
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}
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$updatedsharedata = $oldsharedata;
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array_push($updatedsharedata['shares'], $newshareentry);
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//If number of share items exceeds maximum after this post, clean-up the overflow
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while (count($updatedsharedata['shares']) > $config['maxsharelength']) {
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remove_share_content($oldsharedata, $updatedsharedata['shares'][0]['guid'], $username);
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array_shift($updatedsharedata['shares']);
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}
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return $updatedsharedata;
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}
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function delete_share_item($itemid, $username, $credential, $errorhandler = 'default_error_handler') {
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//Make sure the file exists and can be loaded
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$jsondata = get_share_data($username, $credential, $errorhandler);
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//Load and return only the task list
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$updatedsharedata = remove_share_item($itemid, $jsondata, $username, $credential, $errorhandler);
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if (isset($updatedsharedata)) {
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$file = "data/" . strtolower($username) . "/sharelog.json";
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$written = file_put_contents($file, json_encode($updatedsharedata, JSON_PRETTY_PRINT));
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//Output the results
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if (!$written) {
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$errorhandler("failed to write to file " . $file);
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} else {
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return $updatedsharedata;
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}
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} else {
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$errorhandler("failed to delete new share data");
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}
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}
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function remove_share_item($itemid, $oldsharedata, $username, $credential, $errorhandler = 'default_error_handler') {
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global $config;
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if (!isset($itemid) || !isset($oldsharedata) || !isset($credential)) {
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$errorhandler("remove share item function call missing required parameters!");
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return;
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}
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if (base64_decode($oldsharedata['password']) != $credential || $credential == $config['readonlykey']) {
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$errorhandler("credentials not valid or read-only");
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return;
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}
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remove_share_content($oldsharedata, $itemid, $username);
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$newShares = [];
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foreach ($oldsharedata['shares'] as $share => $value) {
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if ($itemid != $value['guid'])
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{
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array_push($newShares, $value);
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}
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}
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$updatedsharedata = $oldsharedata;
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$updatedsharedata['shares'] = $newShares;
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return $updatedsharedata;
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}
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function remove_share_content($oldsharedata, $itemid, $username) {
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foreach ($oldsharedata['shares'] as $share => $value) {
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if ($itemid == $value['guid'])
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{
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if (strrpos($value['contenttype'], "image") !== false) {
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$file = $value['content'];
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if (file_exists($file)) {
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unlink($file);
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}
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$file = str_replace($itemid, "thumb-".$itemid, $file);
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if (file_exists($file)) {
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unlink($file);
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}
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}
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}
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}
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}
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function default_error_handler($error) {
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die ($error);
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}
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?>
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