github.com/System-Glitch/goyave/v2@v2.10.3-0.20200819142921-51011e75d504/docs/assets/js/19.90e0dab8.js (about)
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They are a convenient way to filter, intercept or alter HTTP requests entering your application. For example, middleware can be used to authenticate users. If the user is not authenticated, a message is sent to the user even before the controller handler is reached. However, if the user is authenticated, the middleware will pass to the next handler. Middleware can also be used to sanitize user inputs, by trimming strings for example, to log all requests into a log file, to automatically add headers to all your responses, etc.")]),t._v(" "),e("p",[t._v("Writing middleware is as easy as writing standard handlers. In fact, middleware are handlers, but they have an additional responsibility: when they are done, the may or may not pass to the next handler, which is either another middleware or a controller handler.")]),t._v(" "),e("h2",{attrs:{id:"writing-middleware"}},[e("a",{staticClass:"header-anchor",attrs:{href:"#writing-middleware"}},[t._v("#")]),t._v(" Writing middleware")]),t._v(" "),e("p",[t._v("Each middleware is written in its own file inside the "),e("code",[t._v("http/middleware")]),t._v(" directory. 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In middleware, you should always check if the request has been parsed correctly before trying to access its data:")]),t._v(" "),e("div",{staticClass:"language-go extra-class"},[e("pre",{pre:!0,attrs:{class:"language-go"}},[e("code",[e("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("if")]),t._v(" request"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(".")]),t._v("Data "),e("span",{pre:!0,attrs:{class:"token operator"}},[t._v("!=")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token boolean"}},[t._v("nil")]),t._v(" "),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n "),e("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Parsing OK")]),t._v("\n"),e("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n")])])]),e("p",[t._v("If you want your middleware to stop the request and respond immediately before reaching the controller handler, simply don't call the "),e("code",[t._v("next")]),t._v(" handler. 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The middleware stops the request and sends "422 Unprocessable Entity" and an error message if the user has sent non-validated field(s). Fields ending with '),e("code",[t._v("_confirmation")]),t._v(" are ignored.")]),t._v(" "),e("p",[t._v("If the body parsing failed, this middleware immediately passes to the next handler. 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