fix(validateTxid): Fixed bug in SLP validateTxid()

src/routes/v3/slp.js

@@ -999,34 +999,59 @@ async function validateBulk(req, res, next) {
 
     // Get data from SLPDB.
     const tokenRes = await axios.get(url, options)
+    // console.log(`tokenRes.data: ${JSON.stringify(tokenRes.data, null, 2)}`)
 
-    const formattedTokens = []
+    let formattedTokens = []
 
+    // Combine the arrays. Why? Generally there is nothing in the u array.
     const concatArray = tokenRes.data.c.concat(tokenRes.data.u)
+
     const tokenIds = []
     if (concatArray.length > 0) {
       concatArray.forEach(token => {
-        tokenIds.push(token.tx.h)
+        tokenIds.push(token.tx.h) // txid
+
         const validationResult = {
           txid: token.tx.h,
           valid: token.slp.valid
         }
+
+        // If the txid is invalid, add the reason it's invalid.
         if (!validationResult.valid)
           validationResult.invalidReason = token.slp.invalidReason
 
         formattedTokens.push(validationResult)
       })
 
-      txids.forEach(tokenId => {
-        if (!tokenIds.includes(tokenId)) {
+      // If a user-provided txid doesn't exist in the data, add it with
+      // valid:false property.
+      txids.forEach(txid => {
+        if (!tokenIds.includes(txid)) {
           formattedTokens.push({
-            txid: tokenId,
+            txid: txid,
             valid: false
           })
         }
       })
     }
 
+    // Catch a corner case of repeated txids. SLPDB will remove redundent TXIDs,
+    // which will cause the output array to be smaller than the input array.
+    if (txids.length > formattedTokens.length) {
+      const newOutput = []
+      for (let i = 0; i < txids.length; i++) {
+        const thisTxid = txids[i]
+
+        // Find the element that matches the current txid.
+        const elem = formattedTokens.filter(x => x.txid === thisTxid)
+
+        newOutput.push(elem[0])
+      }
+
+      // Replace the original output object with the new output object.
+      formattedTokens = newOutput
+    }
+
     res.status(200)
     return res.json(formattedTokens)
   } catch (err) {