Backend – Article Service

Template Code Structure

Function Template 1

Function Template 2

Lambda Functions Overview

Full Lambda Functions

API Gateway Integration

Full API Gateway

Summary of Lambda Functions

This section provides a concise overview of all Lambda functions used in the Article, Profile, and Favorites modules. These functions collectively form the backend workflow of the content system.

1. Article Functions (CRUD + Search + Upload)

  • CreateArticleFunction

    • Endpoint: POST /articles (Auth required)
    • Role: Creates a new article, processes image metadata, resolves geolocation using AWS Location, saves data into DynamoDB and S3.

  • GetArticleFunction

    • Endpoint: GET /articles/{articleId} (Public)
    • Role: Retrieves a single article and images while applying visibility rules.

  • ListArticlesFunction

    • Endpoint: GET /articles (Auth required)
    • Role: Lists public articles enriched with profile data and image metadata.

  • UpdateArticleFunction

    • Endpoint: PATCH /articles/{articleId}
    • Role: Verifies ownership and updates article content, visibility, location, and images.

  • DeleteArticleFunction

    • Endpoint: DELETE /articles/{articleId}
    • Role: Permanently deletes the article and related images from S3.

  • SearchArticlesFunction

    • Endpoint: GET /search (Public)
    • Role: Performs keyword/tag search using DynamoDB queries.

  • GetUploadUrlFunction

    • Endpoint: POST /upload-url (Auth required)
    • Role: Generates a presigned URL for uploading images directly to S3.

2. User Profile Function

  • GetUserArticlesFunction
    • Endpoint: GET /users/{userId}/articles
    • Role: Retrieves all public articles created by a specific user for their profile page.

3. Favorites Functions

  • FavoriteArticleFunction

    • Endpoint: POST /articles/{articleId}/favorite
    • Role: Adds (userId, articleId) mapping into UserFavoritesTable.

  • UnfavoriteArticleFunction

    • Endpoint: DELETE /articles/{articleId}/favorite
    • Role: Removes a favorite record.

  • ListFavoriteArticlesFunction

    • Endpoint: GET /me/favorites
    • Role: Returns all articles favorited by the authenticated user.

Overall Summary

These Lambda functions integrate DynamoDB, S3, Cognito, and AWS Location to create a modular, scalable backend powering the article management system.