https://github.com/lautarodragan/helloworlds.ipfs

https://github.com/lautarodragan/helloworlds.ipfs

experiment ipfs

Last synced: 16 days ago
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• Host: GitHub
• URL: https://github.com/lautarodragan/helloworlds.ipfs
• Owner: lautarodragan
• Created: 2019-04-16T21:26:49.000Z (almost 6 years ago)
• Default Branch: master
• Last Pushed: 2019-04-16T21:27:50.000Z (almost 6 years ago)
• Last Synced: 2024-11-10T20:41:31.456Z (2 months ago)
• Topics: experiment, ipfs
• Language: JavaScript
• Homepage:
• Size: 51.8 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.asciidoc

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README

        
# IPFS Hash Tests

This is a loose repository where I run some tests to understand how IPFS hashes are made.

May add other IPFS related tests, too. Might rename the repository to just `ipfs-tests` in the future, as well.

## Current Tests

### src/index.js

These tests use the https://github.com/multiformats/js-multihash[multihash] library and NodeJS crypto

to generate a multihash out of a piece of content and compare it to the multihash returned by IPFS.

It runs `ipfs add` and `ipfs block put` commands with `child_process.exec`, so you need to have the

IPFS daemon installed and running in your local machine for this to work.

May switch to using the js version of IPFS, as does the alexanderattar test.

### src/alexanderattar.js

This is a test by https://github.com/alexanderattar[Alexander Attar]

originally shared in https://github.com/ipfs/js-ipfs/issues/1205#issuecomment-370943323[a GitHub issue]

and later modified by https://github.com/fazo96[Enrico Fasoli]

in https://github.com/ipfs/js-ipfs/issues/1205#issuecomment-371134571[a later comment in the same GitHub issue].

Alexand pointed me to this test in https://github.com/ipfs/faq/issues/22#issuecomment-392861610[this GitHub issue].

It uses https://github.com/ipld/js-ipld-dag-pb[js-ipld-dag-pb] to manually create a DAGNode,

https://github.com/ipfs/js-ipfs[js-ipfs] to create an IPFS object, and compares the two hashes.

The two match.

It then runs a traditional `add` with the same content. It generates a new hash, different from the one

resulting of manually creating a DAGNode or running `ipfs object put`.

Although running `ipfs cat` on the multihash of the added file returns exactly the same content

byte for byte, running `ipfs object get` on that multihash returns a slightly larger buffer.

```

Buffer.from('Hello'): 

ipfs cat: 

ipfs object get: 

```

The `ipfs object get` version is `08 02 12 05 + Buffer.from('Hello') + 08 02 12 05`.