From 8d3f376b3ee7794e0c06e27cbbad080dee996767 Mon Sep 17 00:00:00 2001 From: Mikiyas-STP Date: Thu, 16 Oct 2025 18:18:14 +0100 Subject: [PATCH 1/8] my first middleware --- .gitignore | 1 + .../mw_using_express/expressmiddlewareapp.js | 11 + .../mw_using_express/package-lock.json | 842 ++++++++++++++++++ .../mw_using_express/package.json | 15 + 4 files changed, 869 insertions(+) create mode 100644 .gitignore create mode 100644 middleware_exercise/mw_using_express/expressmiddlewareapp.js create mode 100644 middleware_exercise/mw_using_express/package-lock.json create mode 100644 middleware_exercise/mw_using_express/package.json diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..b512c09 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +node_modules \ No newline at end of file diff --git a/middleware_exercise/mw_using_express/expressmiddlewareapp.js b/middleware_exercise/mw_using_express/expressmiddlewareapp.js new file mode 100644 index 0000000..f38235d --- /dev/null +++ b/middleware_exercise/mw_using_express/expressmiddlewareapp.js @@ -0,0 +1,11 @@ +//create the app using express +const express = require("express"); +const app = express(); +//my fiirst middleware , request/get the header and attach it to req +function userNameMiddleware(req, res, next) { + const username = req.header("X-Username"); + req.username = username ? username : null; + next(); //to pass control onward +} + +//my second middleware jsonarray middleware \ No newline at end of file diff --git a/middleware_exercise/mw_using_express/package-lock.json b/middleware_exercise/mw_using_express/package-lock.json new file mode 100644 index 0000000..d2050d2 --- /dev/null +++ b/middleware_exercise/mw_using_express/package-lock.json @@ -0,0 +1,842 @@ +{ + "name": "mw_using_express", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "mw_using_express", + "version": "1.0.0", + "license": "ISC", + "dependencies": { + "express": "^5.1.0" + } + }, 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json --- .../mw_using_express/expressmiddlewareapp.js | 31 ++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/middleware_exercise/mw_using_express/expressmiddlewareapp.js b/middleware_exercise/mw_using_express/expressmiddlewareapp.js index f38235d..1eaca84 100644 --- a/middleware_exercise/mw_using_express/expressmiddlewareapp.js +++ b/middleware_exercise/mw_using_express/expressmiddlewareapp.js @@ -8,4 +8,33 @@ function userNameMiddleware(req, res, next) { next(); //to pass control onward } -//my second middleware jsonarray middleware \ No newline at end of file +//my second middleware json array middleware.. manually parsing raw body into json +function jsonArrayMiddleware(req, res, next) { + let data = ''; + + //collecting the chunk of data as soon as they arrive + req.on("data", chunk => { + data += chunk; + }); + + req.on("end", () => { + try { + const parsed = JSON.parse(data); + + //checking if it is an array + if (!Array.isArray(parsed)) { + return res.status(400).send("Request body must be a JSON array."); + } + // check every item is a string + const allStrings = parsed.every((item) => typeof item === "string"); + if (!allStrings) { + return res.status(400).send("All array elements must be strings."); + } + + req.body = parsed; + next(); + } catch (err) { + res.status(400).send("Invalid JSON."); + } + }); +} \ No newline at end of file From 0384cc8d3d0a54330ed3133bf41a97bb8ac2de3f Mon Sep 17 00:00:00 2001 From: Mikiyas-STP Date: Thu, 16 Oct 2025 18:28:18 +0100 Subject: [PATCH 3/8] route handler --- .../mw_using_express/expressmiddlewareapp.js | 31 ++++++++++++++++++- 1 file changed, 30 insertions(+), 1 deletion(-) diff --git a/middleware_exercise/mw_using_express/expressmiddlewareapp.js b/middleware_exercise/mw_using_express/expressmiddlewareapp.js index 1eaca84..bf99564 100644 --- a/middleware_exercise/mw_using_express/expressmiddlewareapp.js +++ b/middleware_exercise/mw_using_express/expressmiddlewareapp.js @@ -37,4 +37,33 @@ function jsonArrayMiddleware(req, res, next) { res.status(400).send("Invalid JSON."); } }); -} \ No newline at end of file +} + +//my route handler +app.post("/", usernameMiddleware, jsonArrayMiddleware, (req, res) => { + const username = req.username; + const subjects = req.body; + const count = subjects.length; + + let response = ""; + + // Auth message + if (username) { + response += `You are authenticated as ${username}.\n\n`; + } else { + response += "You are not authenticated.\n\n"; + } + + // Subject count message + if (count === 1) { + response += `You have requested information about 1 subject: ${subjects[0]}.`; + } else if (count > 1) { + response += `You have requested information about ${count} subjects: ${subjects.join( + ", " + )}.`; + } else { + response += "You have requested information about 0 subjects."; + } + + res.send(response); +}); From 61e27c6401d87a333b08321def6bdc0280fbaa68 Mon Sep 17 00:00:00 2001 From: Mikiyas-STP Date: Thu, 16 Oct 2025 18:36:19 +0100 Subject: [PATCH 4/8] start the server --- .../mw_using_express/expressmiddlewareapp.js | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/middleware_exercise/mw_using_express/expressmiddlewareapp.js b/middleware_exercise/mw_using_express/expressmiddlewareapp.js index bf99564..a2bf705 100644 --- a/middleware_exercise/mw_using_express/expressmiddlewareapp.js +++ b/middleware_exercise/mw_using_express/expressmiddlewareapp.js @@ -67,3 +67,11 @@ app.post("/", usernameMiddleware, jsonArrayMiddleware, (req, res) => { res.send(response); }); + +//start the server +app.listen(3000, () => { + console.log("Server running on http://localhost:3000"); +}); + +//to run node app.js +//on other terminal curl -X POST --data '["Bees"]' -H "X-Username: Ahmed" http://localhost:3000 From 235809508d214af9fc2df94f6500e1d55f94b5c5 Mon Sep 17 00:00:00 2001 From: Mikiyas-STP Date: Thu, 16 Oct 2025 18:37:16 +0100 Subject: [PATCH 5/8] renamed --- .../expressmiddlewareapp.js | 0 .../{mw_using_express => custom_middleware}/package-lock.json | 0 .../{mw_using_express => custom_middleware}/package.json | 0 3 files changed, 0 insertions(+), 0 deletions(-) rename middleware_exercise/{mw_using_express => custom_middleware}/expressmiddlewareapp.js (100%) rename middleware_exercise/{mw_using_express => custom_middleware}/package-lock.json (100%) rename middleware_exercise/{mw_using_express => custom_middleware}/package.json (100%) diff --git a/middleware_exercise/mw_using_express/expressmiddlewareapp.js b/middleware_exercise/custom_middleware/expressmiddlewareapp.js similarity index 100% rename from middleware_exercise/mw_using_express/expressmiddlewareapp.js rename to middleware_exercise/custom_middleware/expressmiddlewareapp.js diff --git a/middleware_exercise/mw_using_express/package-lock.json b/middleware_exercise/custom_middleware/package-lock.json similarity index 100% rename from middleware_exercise/mw_using_express/package-lock.json rename to middleware_exercise/custom_middleware/package-lock.json diff --git a/middleware_exercise/mw_using_express/package.json b/middleware_exercise/custom_middleware/package.json similarity index 100% rename from middleware_exercise/mw_using_express/package.json rename to middleware_exercise/custom_middleware/package.json From 946118ecf88c7dc11b801d03609d3512dce4343a Mon Sep 17 00:00:00 2001 From: Mikiyas-STP Date: Thu, 16 Oct 2025 18:39:49 +0100 Subject: [PATCH 6/8] builtin middleware with express --- .../builtin_middlewares/biltinmw.js | 58 +++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 middleware_exercise/builtin_middlewares/biltinmw.js diff --git a/middleware_exercise/builtin_middlewares/biltinmw.js b/middleware_exercise/builtin_middlewares/biltinmw.js new file mode 100644 index 0000000..fe11c3b --- /dev/null +++ b/middleware_exercise/builtin_middlewares/biltinmw.js @@ -0,0 +1,58 @@ +const express = require("express"); +const app = express(); + +// 🧱 Middleware 1: Check for X-Username header (same as before) +function usernameMiddleware(req, res, next) { + const username = req.header("X-Username"); + req.username = username ? username : null; + next(); +} + +// ✅ Use built-in Express middleware to parse JSON +// This automatically parses JSON bodies if Content-Type is application/json +// You don’t need to collect chunks manually anymore! + +app.post("/", usernameMiddleware, express.json(), (req, res) => { + const username = req.username; + const subjects = req.body; + + // Validate that body is an array of strings + if (!Array.isArray(subjects)) { + return res.status(400).send("Request body must be a JSON array."); + } + + const allStrings = subjects.every((item) => typeof item === "string"); + if (!allStrings) { + return res.status(400).send("All array elements must be strings."); + } + + const count = subjects.length; + let response = ""; + + if (username) { + response += `You are authenticated as ${username}.\n\n`; + } else { + response += "You are not authenticated.\n\n"; + } + + if (count === 1) { + response += `You have requested information about 1 subject: ${subjects[0]}.`; + } else if (count > 1) { + response += `You have requested information about ${count} subjects: ${subjects.join( + ", " + )}.`; + } else { + response += "You have requested information about 0 subjects."; + } + + res.send(response); +}); + +app.listen(3000, () => { + console.log("✅ Server running on http://localhost:3000"); +}); +// curl -X POST \ +// --data '["Bees"]' \ +// -H "Content-Type: application/json" \ +// -H "X-Username: Ahmed" \ +// http://localhost:3000 From 1495b8f94f073787204ce9a14b92ad9efb46a2fe Mon Sep 17 00:00:00 2001 From: Mikiyas-STP Date: Thu, 16 Oct 2025 18:41:21 +0100 Subject: [PATCH 7/8] config --- .../builtin_middlewares/package-lock.json | 842 ++++++++++++++++++ .../builtin_middlewares/package.json | 15 + 2 files changed, 857 insertions(+) create mode 100644 middleware_exercise/builtin_middlewares/package-lock.json 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a/middleware_exercise/builtin_middlewares/package.json b/middleware_exercise/builtin_middlewares/package.json new file mode 100644 index 0000000..bfb3dec --- /dev/null +++ b/middleware_exercise/builtin_middlewares/package.json @@ -0,0 +1,15 @@ +{ + "name": "builtin_middlewares", + "version": "1.0.0", + "main": "biltinmw.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1" + }, + "keywords": [], + "author": "", + "license": "ISC", + "description": "", + "dependencies": { + "express": "^5.1.0" + } +} From f6b7737a30a813b0c7f6a061a2cd43a9e27ca78e Mon Sep 17 00:00:00 2001 From: Mikiyas-STP Date: Thu, 16 Oct 2025 18:45:38 +0100 Subject: [PATCH 8/8] config --- .../custom_middleware/expressmiddlewareapp.js | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/middleware_exercise/custom_middleware/expressmiddlewareapp.js b/middleware_exercise/custom_middleware/expressmiddlewareapp.js index a2bf705..c72f943 100644 --- a/middleware_exercise/custom_middleware/expressmiddlewareapp.js +++ b/middleware_exercise/custom_middleware/expressmiddlewareapp.js @@ -1,7 +1,8 @@ //create the app using express const express = require("express"); const app = express(); -//my fiirst middleware , request/get the header and attach it to req +//my first middleware , request/get the header and attach it to req + function userNameMiddleware(req, res, next) { const username = req.header("X-Username"); req.username = username ? username : null; @@ -40,7 +41,7 @@ function jsonArrayMiddleware(req, res, next) { } //my route handler -app.post("/", usernameMiddleware, jsonArrayMiddleware, (req, res) => { +app.post("/", userNameMiddleware, jsonArrayMiddleware, (req, res) => { const username = req.username; const subjects = req.body; const count = subjects.length;