Initial commit

Once again a weird place to commit, I have already done a lot of work, but I am just bad at using git, okay.

example-app/server/api/pow/challenge.get.ts

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+import { defineEventHandler } from 'h3'
+import { config } from '~~/server/utils/config';
+import { generate_challenge } from '@impost/lib/validator';
+import { ChallengeStrategy } from '@impost/lib';
+import { CHALLENGE_TIMEOUT_MS, outstandingChallenges } from '~~/server/utils/pow';
+
+export default defineEventHandler(async () => {
+    let challenge_config;
+    switch (config.strategy) {
+        case ChallengeStrategy.LeadingZeroes:
+            challenge_config = {
+                parameters: { expires_at: CHALLENGE_TIMEOUT_MS },
+                strategy: config.strategy,
+                difficulty: config.leading_zeroes?.difficulty!,
+            };
+            break;
+        case ChallengeStrategy.TargetNumber:
+            challenge_config = {
+                parameters: { expires_at: CHALLENGE_TIMEOUT_MS },
+                strategy: config.strategy,
+                max_number: config.target_number.max_number,
+            };
+            break;
+    }
+
+    let challenge = await generate_challenge(challenge_config);
+    if (challenge === null) {
+        throw createError({
+            statusCode: 500,
+            statusMessage: 'Failed to generate challenge'
+        });
+    }
+
+    outstandingChallenges.set(challenge.salt, {
+        challenge, timeout: setTimeout(() => {
+            console.log("Challenge timed out:", challenge.salt);
+            outstandingChallenges.delete(challenge.salt);
+        }, CHALLENGE_TIMEOUT_MS)
+    });
+
+    return {
+        challenge,
+    }
+})

example-app/server/api/pow/challenge.post.ts

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+import { defineEventHandler } from 'h3'
+import { validate_challenge } from '@impost/lib/validator';
+import * as z from 'zod';
+import { outstandingChallenges } from '~~/server/utils/pow';
+
+const challengeSchema = z.object({
+    challenge: z.string(),
+    nonce: z.string()
+})
+
+// post handler that takes in the challenge, and the nonce
+export default defineEventHandler(async (event) => {
+    const body = await readValidatedBody(event, challengeSchema.safeParse);
+
+    if (!body.success) {
+        throw createError({
+            statusCode: 400,
+            statusMessage: 'Validation failed'
+        })
+    }
+
+    let target = body.data.challenge;
+    let nonce = body.data.nonce;
+
+    // check if the challenge is valid
+    let challenge_valid = await validate_challenge(outstandingChallenges.get(target)!.challenge, {
+        challenge: target,
+        nonce: nonce
+    });
+
+    if (challenge_valid) {
+        // clear the challenge
+        clearTimeout(outstandingChallenges.get(target)!.timeout);
+        outstandingChallenges.delete(target);
+
+        return {
+            message: 'Challenge solved'
+        };
+    }
+
+    throw createError({
+        statusCode: 400,
+        statusMessage: 'Challenge is not valid'
+    })
+})

example-app/server/api/pow/difficulty.get.ts

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+import { defineEventHandler } from 'h3'
+import { ChallengeStrategy } from '@impost/lib';
+
+export default defineEventHandler((event) => {
+    let difficulty: number;
+
+    switch (config.strategy) {
+        case ChallengeStrategy.LeadingZeroes:
+            difficulty = config.leading_zeroes.difficulty!;
+            break;
+        case ChallengeStrategy.TargetNumber:
+            difficulty = config.target_number.max_number!;
+            break;
+    }
+
+    return {
+        difficulty
+    }
+})

example-app/server/api/pow/difficulty.put.ts

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+import { defineEventHandler } from 'h3'
+import { ChallengeStrategy } from '@impost/lib';
+
+export default defineEventHandler(async (event) => {
+    const body = await readBody(event)
+
+    let difficulty = body.difficulty;
+
+    switch (config.strategy) {
+        case ChallengeStrategy.LeadingZeroes:
+            if (!difficulty || difficulty < 1 || difficulty > 64) {
+                throw createError({
+                    statusCode: 400,
+                    statusMessage: 'Invalid request',
+                });
+            }
+
+            config.leading_zeroes.difficulty = difficulty;
+            break;
+        case ChallengeStrategy.TargetNumber:
+            if (!difficulty || difficulty < 1 || difficulty > 100_000_000) {
+                throw createError({
+                    statusCode: 400,
+                    statusMessage: 'Invalid request',
+                });
+            }
+
+            config.target_number.max_number = difficulty;
+            break;
+    }
+
+    return {
+        message: 'Challenge difficulty set'
+    };
+});