Mercurial > hg > nginx-site
annotate xml/en/docs/njs/examples.xml @ 2517:ba9bfd064a61
Renamed and corrected example in njs.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 24 Mar 2020 10:12:27 +0000 |
parents | b60e5be733cd |
children | 1cd0abf8f1e5 |
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1 <?xml version="1.0"?> |
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2 |
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3 <!-- |
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4 Copyright (C) Nginx, Inc. |
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5 --> |
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6 |
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7 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd"> |
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8 |
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9 <article name="Examples" |
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10 link="/en/docs/njs/examples.html" |
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11 lang="en" |
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12 rev="9"> |
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13 |
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14 <section id="helloword" name="Hello World"> |
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15 |
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16 <para> |
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17 <path>nginx.conf</path>: |
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18 <example> |
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19 load_module modules/ngx_http_js_module.so; |
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20 |
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21 events {} |
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22 |
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23 http { |
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24 js_include hello_world.js; |
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25 |
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26 server { |
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27 listen 8000; |
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28 |
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29 location / { |
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30 js_content hello; |
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31 } |
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32 } |
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33 } |
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34 |
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35 </example> |
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36 </para> |
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37 |
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38 <para> |
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39 <literal>hello_world.js</literal>: |
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40 <example> |
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41 function hello(r) { |
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42 r.return(200, "Hello world!"); |
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43 } |
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44 </example> |
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45 </para> |
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46 |
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47 </section> |
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48 |
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49 |
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50 <section id="urldecode" name="URL Decoding"> |
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51 |
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52 <para> |
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53 <path>nginx.conf</path>: |
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54 <example> |
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55 js_include urldecode.js; |
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56 |
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57 js_set $decoded_foo decoded_foo; |
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58 </example> |
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59 </para> |
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60 |
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61 <para> |
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62 <path>urldecode.js</path>: |
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63 <example> |
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64 function decoded_foo(r) { |
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65 return decodeURIComponent(r.args.foo); |
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66 } |
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67 </example> |
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68 </para> |
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69 |
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70 </section> |
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71 |
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72 |
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73 <section id="urlencode" name="URL Encoding"> |
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74 |
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75 <para> |
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76 <path>nginx.conf</path>: |
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77 <example> |
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78 js_include urlencode.js; |
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79 |
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80 js_set $encoded_foo encoded_foo; |
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81 ... |
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82 |
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83 location / { |
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84 proxy_pass http://example.com?foo=$encoded_foo; |
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85 } |
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86 </example> |
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87 </para> |
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88 |
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89 <para> |
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90 <path>urlencode.js</path>: |
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91 <example> |
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92 function encoded_foo(r) { |
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93 return encodeURIComponent('foo & bar?'); |
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94 } |
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95 </example> |
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96 </para> |
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97 |
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98 </section> |
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99 |
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100 |
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101 <section id="redirect" name="Internal Redirect"> |
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102 |
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103 <para> |
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104 <path>nginx.conf</path>: |
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105 <example> |
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106 js_include redirect.js; |
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107 |
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108 location /redirect { |
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109 js_content redirect; |
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110 } |
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111 |
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112 location @named { |
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113 return 200 named; |
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114 } |
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115 </example> |
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116 </para> |
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117 |
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118 <para> |
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119 <path>redirect.js</path>: |
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120 <example> |
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121 function redirect(r) { |
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122 r.internalRedirect('@named'); |
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123 } |
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124 </example> |
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125 </para> |
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126 |
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127 </section> |
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128 |
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129 |
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130 <section id="fast_response" name="Returning Fastest Response from Proxy"> |
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131 |
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132 <para> |
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133 <path>nginx.conf</path>: |
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134 <example> |
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135 js_include fastresponse.js; |
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136 |
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137 location /start { |
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138 js_content content; |
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139 } |
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140 |
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141 location /foo { |
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142 proxy_pass http://backend1; |
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143 } |
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144 |
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145 location /bar { |
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146 proxy_pass http://backend2; |
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147 } |
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148 </example> |
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149 </para> |
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150 |
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151 <para> |
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152 <path>fastresponse.js</path>: |
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153 <example> |
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154 function content(r) { |
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155 var n = 0; |
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156 |
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157 function done(res) { |
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158 if (n++ == 0) { |
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159 r.return(res.status, res.responseBody); |
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160 } |
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161 } |
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162 |
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163 r.subrequest('/foo', r.variables.args, done); |
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164 r.subrequest('/bar', r.variables.args, done); |
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165 } |
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166 </example> |
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167 </para> |
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168 |
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169 </section> |
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170 |
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171 |
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172 <section id="jwt" name="Creating HS JWT"> |
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173 |
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174 <para> |
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175 <path>nginx.conf</path>: |
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176 <example> |
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177 js_include hs_jwt.js; |
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178 |
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179 js_set $jwt jwt; |
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180 </example> |
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181 </para> |
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182 |
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183 <para> |
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184 <path>hs_jwt.js</path>: |
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185 <example> |
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186 function create_hs256_jwt(claims, key, valid) { |
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187 var header = { "typ" : "JWT", "alg" : "HS256", "exp" : Math.floor(Date.now()/1000) + valid }; |
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188 |
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189 var s = JSON.stringify(header).toBytes().toString('base64url') + '.' |
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190 + JSON.stringify(claims).toBytes().toString('base64url'); |
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191 |
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192 var h = require('crypto').createHmac('sha256', key); |
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193 |
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194 return s + '.' + h.update(s).digest().toString('base64url'); |
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195 } |
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196 |
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197 function jwt(r) { |
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198 var claims = { |
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199 "iss" : "nginx", |
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200 "sub" : "alice", |
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201 "foo" : 123, |
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202 "bar" : "qq", |
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203 "zyx" : false |
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204 }; |
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205 |
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206 return create_hs256_jwt(claims, 'foo', 600); |
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207 } |
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208 </example> |
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209 </para> |
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210 |
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211 </section> |
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212 |
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213 |
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214 <section id="subrequest" name="Accessing API from a Subrequest"> |
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215 |
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216 <para> |
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217 <path>nginx.conf</path>: |
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218 <example> |
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219 js_include subrequest.js; |
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220 |
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221 keyval_zone zone=foo:10m; |
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222 ... |
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223 |
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224 location /keyval { |
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225 js_content set_keyval; |
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226 } |
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227 |
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228 location /version { |
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229 js_content version; |
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230 } |
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231 |
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232 location /api { |
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233 api write=on; |
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234 } |
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235 </example> |
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236 </para> |
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237 |
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238 <para> |
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239 <path>subrequest.js</path>: |
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240 <example> |
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241 function set_keyval(r) { |
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242 r.subrequest('/api/5/http/keyvals/foo', |
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243 { method: 'POST', |
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244 body: JSON.stringify({ foo: 789, bar: "ss dd 00" })}, |
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245 |
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246 function(res) { |
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247 if (res.status >= 300) { |
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248 r.return(res.status, res.responseBody); |
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249 return; |
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250 } |
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251 r.return(500); |
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252 }); |
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253 } |
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254 |
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255 function version(r) { |
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256 r.subrequest('/api/5/nginx', { method: 'GET' }, function(res) { |
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257 if (res.status != 200) { |
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258 r.return(res.status); |
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259 return; |
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260 } |
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261 |
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262 var json = JSON.parse(res.responseBody); |
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263 r.return(200, json.version); |
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264 }); |
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265 } |
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266 </example> |
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267 </para> |
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268 |
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269 </section> |
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270 |
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271 |
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272 <section id="secure_link" name="Creating secure_link Hash"> |
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273 |
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274 <para> |
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275 <path>nginx.conf</path>: |
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276 <example> |
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277 js_include hash.js; |
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278 |
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279 js_set $new_foo create_secure_link; |
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280 ... |
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281 |
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282 location / { |
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283 secure_link $cookie_foo; |
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284 secure_link_md5 "$uri mykey"; |
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285 ... |
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286 } |
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287 |
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288 location @login { |
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289 add_header Set-Cookie "foo=$new_foo; Max-Age=60"; |
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290 return 302 /; |
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291 } |
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292 </example> |
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293 </para> |
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294 |
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295 <para> |
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296 <path>hash.js</path>: |
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297 <example> |
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298 function create_secure_link(r) { |
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299 return require('crypto').createHash('md5') |
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300 .update(r.uri).update(" mykey") |
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301 .digest('base64url'); |
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302 } |
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303 </example> |
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304 </para> |
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305 |
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306 </section> |
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307 |
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308 |
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309 <section id="requests" name="Logging the Number of Requests Per Client"> |
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310 |
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311 <para> |
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312 <path>nginx.conf</path>: |
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313 <example> |
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314 js_include js_requests.js; |
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315 |
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316 js_set $num_requests num_requests; |
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317 |
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318 keyval_zone zone=foo:10m; |
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319 |
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320 keyval $remote_addr $foo zone=foo; |
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321 |
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322 log_format bar '$remote_addr [$time_local] $num_requests'; |
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323 access_log logs/access.log bar; |
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324 |
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325 server { |
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326 listen 8000; |
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327 |
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328 location / { |
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329 root html; |
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330 } |
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331 } |
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332 </example> |
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333 </para> |
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334 |
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335 <para> |
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336 <path>js_requests.js</path>: |
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337 <example> |
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338 function num_requests(r) |
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339 { |
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340 var n = r.variables.foo; |
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341 n = n ? Number(n) + 1 : 1; |
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342 r.variables.foo = n; |
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343 return n; |
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344 } |
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345 </example> |
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346 <note> |
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347 The <link doc="../http/ngx_http_keyval_module.xml" id="keyval"/> and |
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348 <link doc="../http/ngx_http_keyval_module.xml" id="keyval_zone"/> directives |
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349 are available as part of our |
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350 <commercial_version>commercial subscription</commercial_version>. |
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351 </note> |
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352 </para> |
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353 |
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354 </section> |
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355 |
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356 |
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357 <section id="subrequests_chaining" name="Subrequests Chaining"> |
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358 |
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359 <para> |
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360 The example works since |
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361 <link doc="changes.xml" id="njs0.3.8">0.3.8</link>. |
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362 <path>nginx.conf</path>: |
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363 <example> |
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364 js_include subrequests_chaining.js; |
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365 |
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366 location /start { |
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367 js_content content; |
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368 } |
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369 |
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370 location /auth { |
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371 proxy_pass http://auth_backend; |
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372 } |
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373 |
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374 location /backend { |
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375 proxy_pass http://backend; |
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376 } |
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377 </example> |
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378 </para> |
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379 |
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380 <para> |
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381 <path>subrequests_chaining.js</path>: |
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382 <example> |
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383 function content(r) { |
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384 r.subrequest('/auth') |
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385 .then(reply => JSON.parse(reply.responseBody)) |
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386 .then(response => { |
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387 if (!response['token']) { |
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388 throw new Error("token is not available"); |
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389 } |
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390 return reply['token']; |
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391 }) |
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392 .then(token => { |
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393 r.subrequest('/backend', `token=${token}`) |
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394 .then(reply => r.return(reply.status, reply.responseBody)); |
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395 }) |
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396 .catch(_ => r.return(500)); |
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397 } |
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398 </example> |
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399 </para> |
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400 |
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401 </section> |
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402 |
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403 </article> |