I am working on a patch to add IPFS support to Curl <https://github.com/curl/curl/pull/8468>. The goal is not to bring in full P2P node behavior, or provide data into the IPFS network. Rather it is to allow simple retrieval by content identifier (CID) so that shell script authors and other Curl users can use IPFS urls.
Example usage: curl ipfs://bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq/wiki/Vincent_van_Gogh.html This would output the response you’d get from an HTTP request to a public IPFS gateway, eg what you’d get for this: curl https://bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq.ipfs.dweb.link/wiki/Vincent_van_Gogh.html You can read more about the interplay between web addresses and IPFS addressees here. <https://docs.ipfs.io/how-to/address-ipfs-on-web/> Initially I think GET support is all that is needed to be useful. There are a number of public gateways maintained by the community (ipfs.dweb.link in the above example), so the implementation I am planning is to use a default gateway and make libcurl HTTPS requests internally. The gateway could be overridden with an environment variable, like this: CURL_IPFS_GATEWAY=http://127.0.0.1:8080 curl ipfs://bafybeiemxf5abjwjbikoz4mc3a3dla6ual3jsgpdr4cjr3oz3evfyavhwq/wiki/Vincent_van_Gogh.html My thinking is this will be a small patch, smaller than for instance the MQTT support <https://github.com/curl/curl/commit/2522903b792ac5a802f780df60dc4647c58e2477#diff-ed8b659ce184aa0404c6a2642a6bfab86d61f31282502867deb3663204468290> . Are there any example patches adding support for other protocols which are really just wrappers around HTTP? That would help me stick with the coding style. Maybe something in an example curl usage repo? Are there technical concerns or other reasons why Curl would be unlikely to accept this patch? I’m happy to include feedback to improve the quality. I’d like to imagine we can start with a small amount of functionality (GET only) and add more as the community adopts it. (For instance, validating the returned content matches the CID requested would be easy to add, but not part of MVP.) Thanks! Chris http://twitter.com/jchris
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