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.gitignore

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+.env
+node_modules/
+.DS_Store

.vscode/c_cpp_properties.json

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+{
+  "configurations": [
+    {
+      "name": "macos-clang-arm64",
+      "includePath": [
+        "${workspaceFolder}/**"
+      ],
+      "compilerPath": "/usr/bin/clang",
+      "cStandard": "${default}",
+      "cppStandard": "${default}",
+      "intelliSenseMode": "macos-clang-arm64",
+      "compilerArgs": [
+        ""
+      ]
+    }
+  ],
+  "version": 4
+}

.vscode/launch.json

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+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "C/C++ Runner: Debug Session",
+      "type": "lldb",
+      "request": "launch",
+      "args": [],
+      "cwd": "/Users/simdinghao/Documents/Y3S1/CS3230/Assignments/PA1",
+      "program": "/Users/simdinghao/Documents/Y3S1/CS3230/Assignments/PA1/build/Debug/outDebug"
+    }
+  ]
+}

.vscode/settings.json

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+{
+  "C_Cpp_Runner.cCompilerPath": "clang",
+  "C_Cpp_Runner.cppCompilerPath": "clang++",
+  "C_Cpp_Runner.debuggerPath": "lldb",
+  "C_Cpp_Runner.cStandard": "",
+  "C_Cpp_Runner.cppStandard": "",
+  "C_Cpp_Runner.msvcBatchPath": "",
+  "C_Cpp_Runner.useMsvc": false,
+  "C_Cpp_Runner.warnings": [
+    "-Wall",
+    "-Wextra",
+    "-Wpedantic",
+    "-Wshadow",
+    "-Wformat=2",
+    "-Wcast-align",
+    "-Wconversion",
+    "-Wsign-conversion",
+    "-Wnull-dereference"
+  ],
+  "C_Cpp_Runner.msvcWarnings": [
+    "/W4",
+    "/permissive-",
+    "/w14242",
+    "/w14287",
+    "/w14296",
+    "/w14311",
+    "/w14826",
+    "/w44062",
+    "/w44242",
+    "/w14905",
+    "/w14906",
+    "/w14263",
+    "/w44265",
+    "/w14928"
+  ],
+  "C_Cpp_Runner.enableWarnings": true,
+  "C_Cpp_Runner.warningsAsError": false,
+  "C_Cpp_Runner.compilerArgs": [],
+  "C_Cpp_Runner.linkerArgs": [],
+  "C_Cpp_Runner.includePaths": [],
+  "C_Cpp_Runner.includeSearch": [
+    "*",
+    "**/*"
+  ],
+  "C_Cpp_Runner.excludeSearch": [
+    "**/build",
+    "**/build/**",
+    "**/.*",
+    "**/.*/**",
+    "**/.vscode",
+    "**/.vscode/**"
+  ],
+  "C_Cpp_Runner.useAddressSanitizer": false,
+  "C_Cpp_Runner.useUndefinedSanitizer": false,
+  "C_Cpp_Runner.useLeakSanitizer": false,
+  "C_Cpp_Runner.showCompilationTime": false,
+  "C_Cpp_Runner.useLinkTimeOptimization": false,
+  "C_Cpp_Runner.msvcSecureNoWarnings": false
+}

backend/api-gateway/Dockerfile

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+FROM nginx:alpine
+
+COPY nginx.conf /etc/nginx/nginx.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]

backend/api-gateway/nginx.conf

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+worker_processes 1;
+
+events {
+    worker_connections 1024;
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/json;
+
+    sendfile        on;
+    keepalive_timeout  65;
+
+    # Upstream configuration for the question-service
+    upstream question-service {
+        server question-service:5050;  # Docker service name, running on port 5050
+    }
+
+    # Upstream configuration for the user-service
+    upstream user-service {
+        server user-service:3001;  # Docker service name, running on port 3001
+    }
+
+    # Upstream configuration for the matching-service
+    upstream matching-service {
+        server matching-service:3002;  # Docker service name, running on port 3002
+    }   
+
+    # Upstream configuration for the voice-service
+    upstream voice-service {
+        server voice-service:8085; 
+    }
+
+    # Upstream configuration for the collaboration-service
+    upstream collaboration-service {
+        server collaboration-service:8080;
+    }
+
+    # Server configuration
+    server {
+        listen 80;
+
+        # Pass requests to question-service
+        location /api/question-service/ {
+            proxy_pass http://question-service/;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+        }
+
+        # Pass requests to user-service
+        location /api/user-service/ {
+            proxy_pass http://user-service/;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+
+            # Forward Set-Cookie header from user service to the browser
+            proxy_pass_header Set-Cookie;
+        }
+
+        # Pass requests to the matching-service
+        location /api/matching-service/ {
+            proxy_pass http://matching-service/;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+        }
+
+        # Pass requests to the voice-service
+        location /api/voice-service/ {
+            proxy_pass http://voice-service/;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+        }
+
+        location /api/collaboration-service/socket.io/ {
+            proxy_pass http://collaboration-service;
+
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+            proxy_set_header Connection "upgrade";
+        }
+
+        location /api/collaboration-service/ {
+            proxy_pass http://collaboration-service/;
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+        }
+
+        # Custom error page configuration
+        error_page 500 502 503 504 /50x.html;
+        location = /50x.html {
+            root /usr/share/nginx/html;
+        }
+    }
+}

backend/collaboration-service/Dockerfile

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+# Use Node.js base image
+FROM node:18-alpine
+
+# Set working directory inside the container
+WORKDIR /app
+
+# Copy package.json and package-lock.json to the container
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy the rest of the application files
+COPY . .
+
+# Expose the port the app runs on
+EXPOSE 8080
+EXPOSE 2501
+
+# Run the app using ts-node
+CMD ["npx", "ts-node", "app.ts"]
+