Kubo does not reprovide pubsub routing CIDs (pubsubTopicRoutingCid, ipnsPubsubTopicRoutingCid) to delegated HTTP routers

[Rinse12]

Checklist

• This is a bug report, not a question. Ask questions on discuss.ipfs.tech.
• I have searched on the issue tracker for my bug.
• I am running the latest kubo version or have an issue updating.

Installation method

dist.ipfs.tech or ipfs-update

Version

Kubo version: 0.39.0
Repo version: 18
System version: amd64/linux
Golang version: go1.25.4

Config

"API": {
    "HTTPHeaders": {}
  },
  "Addresses": {
    "API": "/ip4/127.0.0.1/tcp/0",
    "Announce": [],
    "AppendAnnounce": [],
    "Gateway": "/ip4/127.0.0.1/tcp/0",
    "NoAnnounce": [],
    "Swarm": [
      "/ip4/0.0.0.0/tcp/0"
    ]
  },
  "AutoConf": {},
  "AutoNAT": {},
  "AutoTLS": {},
  "Bitswap": {},
  "Bootstrap": [
    "auto"
  ],
  "DNS": {
    "Resolvers": {
      ".": "auto"
    }
  },
  "Datastore": {
    "BlockKeyCacheSize": null,
    "BloomFilterSize": 0,
    "GCPeriod": "1h",
    "HashOnRead": false,
    "Spec": {
      "mounts": [
        {
          "mountpoint": "/blocks",
          "path": "blocks",
          "prefix": "flatfs.datastore",
          "shardFunc": "/repo/flatfs/shard/v1/next-to-last/2",
          "sync": false,
          "type": "flatfs"
        },
        {
          "compression": "none",
          "mountpoint": "/",
          "path": "datastore",
          "prefix": "leveldb.datastore",
          "type": "levelds"
        }
      ],
      "type": "mount"
    },
    "StorageGCWatermark": 90,
    "StorageMax": "10GB"
  },
  "Discovery": {
    "MDNS": {
      "Enabled": false
    }
  },
  "Experimental": {
    "FilestoreEnabled": false,
    "Libp2pStreamMounting": false,
    "OptimisticProvide": false,
    "OptimisticProvideJobsPoolSize": 0,
    "P2pHttpProxy": false,
    "UrlstoreEnabled": false
  },
  "Gateway": {
    "DeserializedResponses": null,
    "DisableHTMLErrors": null,
    "ExposeRoutingAPI": null,
    "HTTPHeaders": {},
    "NoDNSLink": false,
    "NoFetch": false,
    "PublicGateways": null,
    "RootRedirect": ""
  },
  "HTTPRetrieval": {},
  "Identity": {
    "PeerID": "12D3KooWKBATFR1KJEVXQvAsWiJXHbw9rDLhGrdqzw3cBSUL5c6G"
  },
  "Import": {
    "BatchMaxNodes": null,
    "BatchMaxSize": null,
    "CidVersion": null,
    "FastProvideRoot": null,
    "FastProvideWait": null,
    "HashFunction": null,
    "UnixFSChunker": null,
    "UnixFSDirectoryMaxLinks": null,
    "UnixFSFileMaxLinks": null,
    "UnixFSHAMTDirectoryMaxFanout": null,
    "UnixFSHAMTDirectorySizeThreshold": null,
    "UnixFSRawLeaves": null
  },
  "Internal": {},
  "Ipns": {
    "DelegatedPublishers": [
      "auto"
    ],
    "RecordLifetime": "",
    "RepublishPeriod": "",
    "ResolveCacheSize": 128
  },
  "Migration": {},
  "Mounts": {
    "FuseAllowOther": false,
    "IPFS": "/ipfs",
    "IPNS": "/ipns",
    "MFS": "/mfs"
  },
  "Peering": {
    "Peers": null
  },
  "Pinning": {
    "RemoteServices": {}
  },
  "Plugins": {
    "Plugins": null
  },
  "Provide": {
    "DHT": {
      "Interval": "1m",
      "SweepEnabled": false
    },
    "Strategy": "all"
  },
  "Provider": {},
  "Pubsub": {
    "DisableSigning": false,
    "Router": ""
  },
  "Reprovider": {},
  "Routing": {
    "Methods": {
      "find-peers": {
        "RouterName": "HttpRouterNotSupported"
      },
      "find-providers": {
        "RouterName": "HttpRoutersParallel"
      },
      "get-ipns": {
        "RouterName": "HttpRouterNotSupported"
      },
      "provide": {
        "RouterName": "HttpRoutersParallel"
      },
      "put-ipns": {
        "RouterName": "HttpRouterNotSupported"
      }
    },
    "Routers": {
      "HttpRouter1": {
        "Parameters": {
          "Endpoint": "http://127.0.0.1:3000"
        },
        "Type": "http"
      },
      "HttpRouterNotSupported": {
        "Parameters": {
          "Endpoint": "http://kubohttprouternotsupported"
        },
        "Type": "http"
      },
      "HttpRoutersParallel": {
        "Parameters": {
          "Routers": [
            {
              "IgnoreErrors": true,
              "RouterName": "HttpRouter1",
              "Timeout": "10s"
            }
          ]
        },
        "Type": "parallel"
      }
    },
    "Type": "custom"
  },
  "Swarm": {
    "AddrFilters": null,
    "ConnMgr": {},
    "DisableBandwidthMetrics": false,
    "DisableNatPortMap": false,
    "RelayClient": {},
    "RelayService": {},
    "ResourceMgr": {},
    "Transports": {
      "Multiplexers": {},
      "Network": {},
      "Security": {}
    }
  },
  "Version": {}
}

Description

I noticed a bug where IPNS-Over-Pubsub and pubsub routing CIDs are initially
provided to delegated HTTP routers, but are not reprovided after the configured
interval.

What I was doing:

• Started Kubo with delegated HTTP routing for provide and find-providers.
• Subscribed to a new pubsub topic and published a message.
• Generated a new IPNS key and published an IPNS record.
• Derived two routing CIDs:
  • pubsubTopicRoutingCid from the new pubsub topic.
  • ipnsPubsubTopicRoutingCid from the IPNS pubsub topic.
• Watched the HTTP router logs for PUT /routing/v1/providers/.

How the routing CIDs are calculated:

• pubsubTopicRoutingCid:

  • Routing key is floodsub:<topic> using UTF-8 bytes.
  • Hash is SHA-256.
  • CID is CIDv1 with codec 0x55 (raw) and the SHA-256 multihash.
  • Equivalent: CID.createV1(0x55, sha256("floodsub:" + topic))

• ipnsPubsubTopicRoutingCid:

  • IPNS pubsub topic is /record/ + base64url(/ipns/ + PeerIdBytes(ipnsName)).
  • Routing key is floodsub:<ipnsPubsubTopic> using UTF-8 bytes.
  • Hash is SHA-256.
  • CID is CIDv1 with codec 0x55 (raw) and the SHA-256 multihash.
  • Equivalent: CID.createV1(0x55, sha256("floodsub:" + ipnsPubsubTopic))

What I observed:

• Initial provide succeeded for both routing CIDs.
• After one reprovide interval, neither routing CID was reprovided to the HTTP router.

Steps to reliably reproduce:

1. Clone the repro repo and install dependencies.

git clone https://github.com/Rinse12/reproduce_kubo_bug_with_not_reproviding_ipns_pubsub_topic_routing_cid
cd reproduce_kubo_bug_with_not_reproviding_ipns_pubsub_topic_routing_cid/
npm install
node repro.js

2. The script will:

• Start a local HTTP router and Kubo daemon.
• Subscribe to a new pubsub topic, publish a message.
• Create and publish an IPNS record.
• Derive pubsubTopicRoutingCid and ipnsPubsubTopicRoutingCid.
• Check initial provide and then reprovide after the configured interval.

Expected behavior:

• Both routing CIDs are provided initially and reprovided every interval.

Actual behavior:

• Initial provides are seen.
• Reprovides are missing for routing CIDs.