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Support Custom Protocols in WebExtension · Issue #164 · ipfs/ipfs-companion · GitHub

(living summary: updated @ 2018-09)

This issue tracks browser extension support for various protocol schemes and URIs according to four stages of the upgrade path for path addressing and IPFS Addressing in Web Browsers memo, namely:

URLs:

ipfs://{cidv1b32} → http://127.0.0.1:8080/ipfs/{cidv1b32}
ipns://{hash} → http://127.0.0.1:8080/ipns/{hash}

URI:

dweb:/ip[f|n]s/{hash} → http://127.0.0.1:8080/ip[f|n]s/{hash}

This issue also tracks (currently nonexistent) ways to address/workaround how Origin is calculated (Problem #2)

No such thing yet (but see WIP work in comments)

• BUT! We use the most insane workaround in Support Custom Protocols in WebExtension #164 (comment). It works in both Firefox (Desktop-only – dweb:/ipfs/$cid not detected on Android #348) and Chrome and is the best thing we can do as of late 2017. It was merged with feat: Poor Man's Protocol Handlers #283.

• Support for simplified redirect-based protocol handler (simple redirect, no origin support) landed in Firefox 54 (Bug #1310427).
  • Prefixed, basic web+fs protocol is supported as a redirect: Support Custom Protocols in WebExtension #164 (comment)
  • Removal of web+ prefix
    • a thread at Potential design problem with the protocol handlers API
    • Whitelist custom protocol handlers for work on decentralization technologies with WebExtensions
• More advanced API to implement programmable custom protocol handler in Firefox is currently discussed/designed:
  • Should provide a way to inject responses (Problem #1)

    • Rob Wu wrote up a draft concept of having a webRequest.respondWithcapability [but it went nowhere so far]
      – https://mail.mozilla.org/pipermail/dev-addons/2017-December/003466.html

  • Should provide control over how Origin is calculated (Problem #2)
  • Bugzilla #1271553 starting at comment #16 (REOPENED 🙃 )
    • I described our use case in comment #47
  • Experimental Protocol Handler API for WebExtensions is being designed as a part of mozilla/libdweb:

    The Protocol API allows you to handle custom protocols from your Firefox extension. This is different from the existing WebExtensions protocol handler API in that it does not register a website for handling corresponding URLs but rather allows your WebExtension to implement the handler.
    More: https://github.com/mozilla/libdweb/#protocol-api

    • Still experimental, requires a special build, but the goal is for this to land in regular builds of Firefox Nightly at some point in the future ✨
    • We are working on a PoC handler that loads data over raw IPFS and keeps ipfs:// in address bar.
      It can be found in libdweb branch. More info in PR [PoC] libdweb experiment: protocol handler API #533 and /libdweb/docs/libdweb.md

• no API for this yet: Chrome 67 requires web+ prefix for non-safelisted protocols
• Chrome published intent-to-implement support for registering HTTP-based handlers for DWeb protocols without web+ prefix (context: Safelisting DWeb Protocols arewedistributedyet/arewedistributedyet#23)
• @lidel filled Extensions API should implement manifest.json/protocol_handlers for feature-parity with Firefox

• browser.protocol.registerStringProtocol available to trusted extensions
• missing api for Buffer/Stream-based protocols ( Muon-based Brave Browser Integrations  #312 (comment))

• Basically same challenges as Chromium right now

• The four stages of the upgrade path for path addressing: Background on Address Scheme discussions (dweb, ipfs:// and more) specs#152 (comment)
• Old discussions about browser Origins: Tackle identifying origins with (or without?) dweb: paths in-web-browsers#6
  • Suborigins
  • Subdomains

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