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6 |
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7 | 'use strict';
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8 |
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9 | const assert = require('bsert');
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10 | const fs = require('fs');
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11 | const Path = require('path');
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12 |
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13 |
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14 |
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15 |
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16 |
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17 |
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18 |
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19 | function fileServer(prefix) {
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20 | assert(typeof prefix === 'string');
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21 |
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22 | return async (req, res) => {
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23 | if (req.method !== 'GET' && req.method !== 'HEAD')
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24 | return;
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25 |
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26 | const file = Path.join(prefix, req.pathname);
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27 |
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28 | let stat = null;
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29 |
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30 | try {
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31 | stat = await fsStat(file);
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32 | } catch (e) {
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33 | if (e.code === 'ENOENT')
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34 | return;
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35 | throw e;
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36 | }
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37 |
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38 | if (stat.isDirectory()) {
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39 | const title = req.pathname;
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40 | const body = await dir2html(file, title, req.prefix());
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41 | res.send(200, body, 'html');
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42 | return;
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43 | }
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44 |
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45 | try {
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46 | await res.sendFile(file);
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47 | } catch (e) {
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48 | throw wrapError(e);
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49 | }
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50 | };
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51 | }
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52 |
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53 |
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54 |
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55 |
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56 |
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57 | function fsStat(file) {
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58 | return new Promise((resolve, reject) => {
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59 | fs.stat(file, (err, result) => {
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60 | if (err) {
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61 | reject(wrapError(err));
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62 | return;
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63 | }
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64 | resolve(result);
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65 | });
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66 | });
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67 | }
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68 |
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69 | function fsReaddir(file) {
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70 | return new Promise((resolve, reject) => {
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71 | fs.readdir(file, (err, result) => {
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72 | if (err) {
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73 | reject(wrapError(err));
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74 | return;
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75 | }
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76 | resolve(result);
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77 | });
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78 | });
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79 | }
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80 |
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81 | function wrapError(e) {
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82 | if (!e.code) {
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83 | const err = new Error('Internal server error.');
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84 | err.statusCode = 500;
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85 | return err;
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86 | }
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87 |
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88 | switch (e.code) {
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89 | case 'ENOENT':
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90 | case 'ENAMETOOLONG':
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91 | case 'ENOTDIR':
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92 | case 'EISDIR': {
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93 | const err = new Error('File not found.');
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94 | err.code = e.code;
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95 | err.syscall = e.syscall;
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96 | err.statusCode = 404;
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97 | return err;
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98 | }
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99 | case 'EACCES':
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100 | case 'EPERM': {
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101 | const err = new Error('Cannot access file.');
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102 | err.code = e.code;
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103 | err.syscall = e.syscall;
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104 | err.statusCode = 403;
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105 | return err;
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106 | }
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107 | case 'EMFILE': {
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108 | const err = new Error('Too many open files.');
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109 | err.code = e.code;
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110 | err.syscall = e.syscall;
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111 | err.statusCode = 500;
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112 | return err;
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113 | }
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114 | default: {
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115 | const err = new Error('Cannot access file.');
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116 | err.code = e.code;
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117 | err.syscall = e.syscall;
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118 | err.statusCode = 500;
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119 | return err;
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120 | }
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121 | }
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122 | }
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123 |
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124 | function escapeHTML(html) {
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125 | return html
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126 | .replace(/&/g, '&')
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127 | .replace(/</g, '<')
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128 | .replace(/>/g, '>')
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129 | .replace(/"/g, '"')
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130 | .replace(/'/g, ''');
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131 | }
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132 |
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133 | async function dir2html(parent, title, prefix) {
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134 | let body = '';
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135 |
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136 | title = escapeHTML(title);
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137 | prefix = escapeHTML(prefix);
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138 |
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139 | body += '<!DOCTYPE html>\n';
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140 | body += '<html lang="en">\n';
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141 | body += ' <head>\n';
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142 | body += ` <title>Index of ${title}</title>\n`;
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143 | body += ' <meta charset="utf-8">\n';
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144 | body += ' </head>\n';
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145 | body += ' <body>\n';
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146 | body += ` <p>Index of ${title}</p>\n`;
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147 | body += ' <ul>\n';
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148 | body += ` <li><a href="${prefix}..">../</a></li>\n`;
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149 |
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150 | const list = await fsReaddir(parent);
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151 | const dirs = [];
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152 | const files = [];
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153 |
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154 | for (const file of list) {
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155 | const path = Path.join(parent, file);
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156 | const stat = await fsStat(path);
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157 |
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158 | if (stat.isDirectory())
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159 | dirs.push(file);
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160 | else
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161 | files.push(file);
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162 | }
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163 |
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164 | for (const file of dirs.sort()) {
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165 | const name = escapeHTML(file);
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166 | const href = `${prefix}${name}`;
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167 | body += ` <li><a href="${href}">${name}/</a></li>\n`;
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168 | }
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169 |
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170 | for (const file of files.sort()) {
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171 | const name = escapeHTML(file);
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172 | const href = `${prefix}${name}`;
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173 | body += ` <li><a href="${href}">${name}</a></li>\n`;
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174 | }
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175 |
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176 | body += ' </ul>\n';
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177 | body += ' </body>\n';
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178 | body += '</html>\n';
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179 |
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180 | return body;
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181 | }
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182 |
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183 |
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184 |
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185 |
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186 |
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187 | module.exports = fileServer;
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