Add option to use existing CDXJ rather than indexing from WARCs

README.md

@@ -100,6 +100,14 @@ If not provided, **js-wacz** is going to attempt to detect pages in WARC records
 js-wacz create -f "collection/*.warc.gz" --pages collection/pages.jsonl
 ```
 
+### --cdxj
+
+Allows to pass a directory of existing CDXJ files, rather than indexing from WARCs. Must be used in combination with `--pages`.
+
+```bash
+js-wacz create -f "collection/*.warc.gz" --pages collection/pages.jsonl --cdxj collection/indexes/
+```
+
 ### --url
 
 If provided, will be used as the [`mainPageUrl` attribute for `datapackage.json`](https://specs.webrecorder.net/wacz/1.1.1/#datapackage-json).

bin/cli.js

@@ -1,6 +1,8 @@
 #! /usr/bin/env node
 
 import { createReadStream } from 'fs'
+import fs from 'fs/promises'
+import { resolve } from 'path'
 import * as readline from 'node:readline/promises'
 
 import log from 'loglevel'
@@ -59,6 +61,10 @@ program.command('create')
   .option(
     '--log-level <string>',
     'Can be "silent", "trace", "debug", "info", "warn", "error"', 'info')
+  .option('--cdxj <string>',
+    'Path to a directory containing CDXJ indices to merge into final WACZ CDXJ. ' +
+    'If not provided, js-wacz will reindex from WARCS. Must be used in combination ' +
+    'with --pages, since using this option will skip reading the WARC files.')
   .action(async (name, options, command) => {
     /** @type {Object} */
     const values = options._optionValues
@@ -93,6 +99,11 @@ program.command('create')
       return
     }
 
+    if (values?.cdxj && !values?.pages) {
+      console.error('Error: --cdxj option must be used in combination with --pages.')
+      return
+    }
+
     // Pass options to WACZ
     try {
       archive = new WACZ({
@@ -133,6 +144,35 @@ program.command('create')
       }
     }
 
+    // Ingest user-provided CDX files, if any.
+    if (values?.cdxj) {
+      try {
+        const dirPath = values?.cdxj
+        const cdxjFiles = await fs.readdir(dirPath)
+        const allowedExts = ['cdx', 'cdxj']
+
+        for (let i = 0; i < cdxjFiles.length; i++) {
+          const cdxjFile = resolve(dirPath, cdxjFiles[i])
+
+          const ext = cdxjFile.split('.').pop()
+          if (!allowedExts.includes(ext)) {
+            log.info(`CDXJ: Skipping file ${cdxjFile}, not a CDXJ file`)
+            continue
+          }
+
+          log.info(`CDXJ: Reading entries from ${cdxjFile}`)
+          const rl = readline.createInterface({ input: createReadStream(cdxjFile) })
+
+          for await (const line of rl) {
+            archive.addCDXJ(line + '\n')
+          }
+        }
+      } catch (err) {
+        log.trace(err)
+        log.error('An error occurred while processing user-provided CDXJ indices.')
+      }
+    }
+
     // Main process
     try {
       await archive.process()

index.js

@@ -76,6 +76,12 @@ export class WACZ {
    */
   detectPages = true
 
+  /**
+   * From WACZOptions.indexFromWARCs.
+   * @type {boolean}
+   */
+  indexFromWARCs = true
+
   /**
    * From WACZOptions.url.
    * @type {?string}
@@ -270,6 +276,10 @@ export class WACZ {
       this.detectPages = false
     }
 
+    if (options?.indexFromWARCs === false) {
+      this.indexFromWARCs = false
+    }
+
     if (options?.url) {
       try {
         new URL(options.url) // eslint-disable-line
@@ -337,8 +347,10 @@ export class WACZ {
     info('Initializing indexer')
     this.initWorkerPool()
 
-    info('Indexing WARCS')
-    await this.indexWARCs()
+    if (this.indexFromWARCs) {
+      info('Indexing WARCS')
+      await this.indexWARCs()
+    }
 
     info('Harvesting sorted indexes from trees')
     this.harvestArraysFromTrees()
@@ -792,6 +804,19 @@ export class WACZ {
     return page
   }
 
+  /**
+   * Allows to manually add a CDJX entry to `this.cdxTree`.
+   * Calling this method automatically turns indexing from WARCS off.
+   * @param {string} cdjx - CDJX as string
+   * @returns {Promise<void>}
+   */
+  addCDXJ = (cdjx) => {
+    this.stateCheck()
+    this.indexFromWARCs = false
+
+    this.cdxTree.setIfNotPresent(cdjx, true)
+  }
+
   /**
    * Adds a file to the output ZIP stream.
    * Automatically keeps trace of file in `this.resources` so it can be referenced in datapackage.json.

index.test.js

@@ -74,6 +74,20 @@ test('WACZ constructor accounts for options.detectPages if valid.', async (_t) =
   assert.equal(archive.detectPages, false)
 })
 
+test('WACZ constructor ignores options.indexFromWARCs if invalid.', async (_t) => {
+  const scenarios = ['foo', {}, Buffer.alloc(0), 12, () => {}]
+
+  for (const indexFromWARCs of scenarios) {
+    const archive = new WACZ({ input: FIXTURE_INPUT, indexFromWARCs })
+    assert.equal(archive.indexFromWARCs, true)
+  }
+})
+
+test('WACZ constructor accounts for options.indexFromWARCs if valid.', async (_t) => {
+  const archive = new WACZ({ input: FIXTURE_INPUT, indexFromWARCs: false })
+  assert.equal(archive.indexFromWARCs, false)
+})
+
 test('WACZ constructor ignores options.url if invalid.', async (_t) => {
   const scenarios = ['foo', {}, Buffer.alloc(0), 12, () => {}]
 
@@ -178,6 +192,17 @@ test('addPage adds entry to pagesTree and turns detectPages off.', async (_t) =>
   assert.equal(archive.pagesTree.length, 1)
 })
 
+test('addCDXJ adds entry to cdxTree and turns indexFromWARCs off.', async (_t) => {
+  const archive = new WACZ({ input: FIXTURE_INPUT })
+  assert.equal(archive.indexFromWARCs, true)
+  assert.equal(archive.cdxTree.length, 0)
+
+  archive.addCDXJ('net,webrecorder)/ 20240307070734 {"url":"https://webrecorder.net/","mime":"text/html","status":200,"digest":"16966a2a2909825ad1d9a6f1b2f4833c8fe43428cb9920d0f974bd7b3d73c31d","length":3941,"offset":0,"filename":"rec-8bc4bd095683-20240307070734658-0.warc.gz"}')
+
+  assert.equal(archive.indexFromWARCs, false)
+  assert.equal(archive.cdxTree.length, 1)
+})
+
 // Note: if `TEST_SIGNING_URL` / `TEST_SIGNING_TOKEN` are present, this will also test the signing feature.
 test('WACZ.process runs the entire process and writes a valid .wacz to disk, accounting for options.', async (_t) => {
   //