+ create user with public/private key

+ sign and verify votes and prevent unverified updates

server/api/polls/[id].ts

@@ -1,3 +1,4 @@
+import * as Y from 'yjs';
 // server/api/polls/[id].ts
 export default defineEventHandler(async (event) => {
     const method = event.node.req.method;
@@ -23,6 +24,40 @@ export default defineEventHandler(async (event) => {
         const body = await readBody(event);
 
         if (body.update && Array.isArray(body.update)) {
+            // create a temp Y.Doc to encode the Data
+            const tempDoc = new Y.Doc();
+            Y.applyUpdate(tempDoc, new Uint8Array(body.update));
+            const yMap = tempDoc.getMap('shared-poll');
+            const pollData = yMap.toJSON();
+
+            // verify pollData
+            for(var option in pollData){
+                const votes = pollData[option] || [];
+                var pubKeys: CryptoKey[] = [];
+
+                const verifyAllVotesForOption = async (votes: SignedData<VoteData>[]) => {
+                    console.log("verifying votes for option " + option,votes);
+                    // check last votes first. if there is something wrong, its likely in the last vote.
+                    for (let i = votes.length-1; i >= 0 ; i--) {
+                        const userStorage = useStorage('users'); 
+                        const votePubKeyString = await userStorage.getItem(`user:${votes[i]?.data.userid}`);
+                        //console.log("Using public key: "+votePubKeyString)
+                        const votePubKey = await stringToCryptoKey(String(votePubKeyString),'public')
+                        const isValid = await verifyChainedVote(votes, i,votePubKey);
+                        if(!isValid){
+                            console.error("Error! Invalid Vote at: " + i,votes)
+                            return false;
+                        }
+                    }
+                    return true;
+                };
+                const verified = await verifyAllVotesForOption(votes);
+                if(!verified){
+                    console.error("Failed to verify option: "+option)
+                    throw createError({ statusCode: 400, statusMessage: 'PollData contains unverifyable content!' });
+                }
+            }
+
             // Save the binary update (sent as an array of numbers) to storage
             await storage.setItem(`poll:${pollId}`, body.update);
             return { success: true };

server/api/users/[id].ts

@@ -0,0 +1,41 @@
+// server/api/users/[id].ts
+export default defineEventHandler(async (event) => {
+    const method = event.node.req.method;
+    const userId = getRouterParam(event, 'id');
+
+    // We use Nitro's built-in storage. 
+    // 'polls' is the storage namespace.
+    const storage = useStorage('users'); 
+
+    if (!userId) {
+        throw createError({ statusCode: 400, statusMessage: 'User ID required' });
+    }
+
+    // GET: Fetch the saved Yjs document state
+    if (method === 'GET') {
+        const data = await storage.getItem(`user:${userId}`);
+        // Return the array of numbers (or null if it doesn't exist yet)
+        return { public_key: data };
+    }
+
+    // POST: Save a new Yjs document state
+    if (method === 'POST') {
+        const body = await readBody(event);
+
+        if (body.public_key) {
+            const data = await storage.getItem(`user:${userId}`);
+
+            if (data == undefined || data == null) {
+                // Save the binary update (sent as an array of numbers) to storage
+                await storage.setItem(`user:${userId}`, body.public_key);
+                console.log("New User created: " + userId)
+                console.log("Public Key: " + body.public_key);
+                return { success: true };
+            }
+
+            throw createError({ statusCode: 400, statusMessage: 'User already exists.' });
+        }
+
+        throw createError({ statusCode: 400, statusMessage: 'Invalid update payload' });
+    }
+});