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89 lines
2.9 KiB
89 lines
2.9 KiB
7 years ago
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pragma solidity ^0.4.17;
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contract Forum {
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//----------------------------------------USER----------------------------------------
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struct User {
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string userName; // TODO: set an upper bound instead of arbitrary string
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// TODO: orbitDBAddress;
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uint[] topicIDs; // IDs of the topics the user created
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uint[] postIDs; // IDs of the posts the user created
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}
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mapping (address => User) users;
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mapping (string => address) userAddresses;
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function signUp(string userName) public returns (bool) { // Also allows user to update his name - TODO: his previous name will appear as taken
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require(!isUserNameTaken(userName));
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users[msg.sender] = User(userName, new uint[](0), new uint[](0));
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userAddresses[userName] = msg.sender;
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return true;
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}
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function login() public view returns (string) {
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require (hasUserSignedUp(msg.sender));
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return users[msg.sender].userName;
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}
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function getUsername(address userAddress) public view returns (string) {
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return users[userAddress].userName;
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}
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function getUserAddress(string userName) public view returns (address) {
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return userAddresses[userName];
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}
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function hasUserSignedUp(address userAddress) public view returns (bool) {
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if (bytes(getUsername(userAddress)).length!=0)
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return true;
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return false;
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}
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function isUserNameTaken(string userName) public view returns (bool) {
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if (getUserAddress(userName)!=0)
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return true;
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return false;
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}
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//----------------------------------------TOPIC----------------------------------------
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struct Topic {
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uint topicID;
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address author;
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uint timestamp;
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uint[] postIDs;
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}
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struct Post {
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uint postID;
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address author;
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uint timestamp;
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}
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uint numTopics; // Total number of topics
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uint numPosts; // Total number of posts
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mapping (uint => Topic) topics;
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mapping (uint => Post) posts;
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function createTopic() public returns (uint topicID) {
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require(hasUserSignedUp(msg.sender)); // Only registered users can create topics
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topicID = numTopics++;
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topics[topicID] = Topic(topicID, msg.sender, block.timestamp, new uint[](0));
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users[msg.sender].topicIDs.push(topicID);
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}
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function createPost(uint topicID) public returns (uint postID) {
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require(hasUserSignedUp(msg.sender)); // Only registered users can create posts
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require(topicID<numTopics); // Only allow posting to a topic that exists
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postID = numPosts++;
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posts[postID] = Post(postID, msg.sender, block.timestamp);
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topics[topicID].postIDs.push(postID);
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users[msg.sender].postIDs.push(postID);
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}
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function getTopicPosts (uint topicID) public view returns (uint[]) {
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require(topicID<numTopics); // Topic should exist
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return topics[topicID].postIDs;
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}
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}
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