fix: false-positives in sameGateway

This ensures sameGateway returns true only if the tested URL is
either a valid path, subdomain, or RPC URL related to local
Gateway or Kubo instance.

Everything else should be ignored, because people may run Kubo Gateway
on localhost:8080, and then stop it, and then run some unrelated HTTP
server on the same port.

This is unfortunate papercut due to the 8080 being very very popular
default port for all things HTTP. Luckily, Companion has enough
information to make this right.

add-on/src/lib/ipfs-path.js

@@ -126,6 +126,11 @@ export function sameGateway (url, gwUrl) {
     url.hostname = '127.0.0.1'
   }
 
+  // Additional check to avoid false-positives when user has some unrelated HTTP server running on localhost:8080
+  // It is not "sameGateway" if "localhost" URL does not look like Gateway or RPC URL.
+  // This removes surface for bugs like https://github.com/ipfs/ipfs-companion/issues/1162
+  if (!(isIPFS.url(url.toString()) || isIPFS.subdomain(url.toString()) || url.pathname.startsWith('/api/v0/') || url.pathname.startsWith('/webui'))) return false
+
   const gws = [gwUrl.host]
 
   // localhost gateway has more than one hostname

add-on/src/lib/ipfs-request.js

@@ -144,11 +144,7 @@ export function createRequestModifier (getState, dnslinkResolver, ipfsPathValida
 
       // When local IPFS node is unreachable , show recovery page where user can redirect
       // to public gateway.
-      if (!state.nodeActive && //                  node is not active
-        !state.redirect && //                      this is not a redirect request
-        request.type === 'main_frame' && //        this is a request for a root document
-        sameGateway(request.url, state.gwURL) //   this is a request to the local gateway
-      ) {
+      if (!state.nodeActive && request.type === 'main_frame' && sameGateway(request.url, state.gwURL)) {
         const publicUri = ipfsPathValidator.resolveToPublicUrl(request.url, state.pubGwURLString)
         return { redirectUrl: `${dropSlash(runtimeRoot)}${recoveryPagePath}#${encodeURIComponent(publicUri)}` }
       }

test/functional/lib/ipfs-path.test.js

@@ -184,11 +184,23 @@ describe('ipfs-path.js', function () {
       const gw = 'http://localhost:8080'
       expect(sameGateway(url, gw)).to.equal(true)
     })
-    it('should return true on 127.0.0.1/0.0.0.0 host match', function () {
+    it('should return true on localhost subdomain host match', function () {
+      const url = 'http://bafybeigdyrzt5sfp7udm7hu76uh7y26nf3efuylqabf3oclgtqy55fbzdi.ipfs.localhost:8080/foo/bar'
+      const gw = 'http://localhost:8080'
+      expect(sameGateway(url, gw)).to.equal(true)
+    })
+    it('should return true on RPC webui path 127.0.0.1/0.0.0.0 host match', function () {
+      // this is misconfiguration, but handling it in sameGateway ensures users who do this dont waste our time debugging
       const url = 'http://0.0.0.0:5001/webui'
       const api = 'http://127.0.0.1:5001'
       expect(sameGateway(url, api)).to.equal(true)
     })
+    it('should return true on RPC /api/v0 path 127.0.0.1/0.0.0.0 host match', function () {
+      // this is misconfiguration, but handling it in sameGateway ensures users who do this dont waste our time debugging
+      const url = 'http://0.0.0.0:5001/api/v0/id'
+      const api = 'http://127.0.0.1:5001'
+      expect(sameGateway(url, api)).to.equal(true)
+    })
     it('should return false on hostname match but different port', function () {
       const url = 'https://localhost:8081/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR/foo/bar'
       const gw = 'http://localhost:8080'
@@ -289,7 +301,7 @@ describe('ipfs-path.js', function () {
       expect(ipfsPathValidator.isRedirectPageActionsContext(url)).to.equal(true)
     })
     it('should return false for /ipfs/ URL at Local Gateway', function () {
-      const url = `${state.gwURL}/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR?argTest#hashTest`
+      const url = `${state.gwURL}ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR?argTest#hashTest`
       expect(ipfsPathValidator.isRedirectPageActionsContext(url)).to.equal(false)
     })
     it('should return false for IPFS content loaded from IPFS API port', function () {

test/functional/lib/ipfs-request-gateway-redirect.test.js

@@ -353,7 +353,7 @@ describe('modifyRequest.onBeforeRequest:', function () {
       describe('request for IPFS path at the localhost', function () {
         // we do not touch local requests, as it may interfere with other nodes running at the same machine
         // or could produce false-positives such as redirection from localhost:5001/ipfs/path to localhost:8080/ipfs/path
-        it('should fix localhost API hostname to IP', function () {
+        it('should fix localhost Kubo RPC hostname to IP', function () {
           const request = url2request('http://localhost:5001/ipfs/QmPhnvn747LqwPYMJmQVorMaGbMSgA7mRRoyyZYz3DoZRQ/')
           // expectNoRedirect(modifyRequest, request)
           expect(modifyRequest.onBeforeRequest(request).redirectUrl)
@@ -375,14 +375,14 @@ describe('modifyRequest.onBeforeRequest:', function () {
           expect(modifyRequest.onBeforeRequest(request).redirectUrl)
             .to.equal('http://127.0.0.1:5001/ipfs/QmPhnvn747LqwPYMJmQVorMaGbMSgA7mRRoyyZYz3DoZRQ/')
         })
-        it('should fix localhost API to IP', function () {
+        it('should be left untouched if /webui on localhost Kubo RPC port', function () {
           // https://github.com/ipfs/ipfs-companion/issues/291
           const request = url2request('http://localhost:5001/webui')
           // expectNoRedirect(modifyRequest, request)
           expect(modifyRequest.onBeforeRequest(request).redirectUrl)
             .to.equal('http://127.0.0.1:5001/webui')
         })
-        it('should be left untouched if localhost API IP is used, even when x-ipfs-path is present', function () {
+        it('should be left untouched if localhost Kubo RPC IP is used, even when x-ipfs-path is present', function () {
           // https://github.com/ipfs-shipyard/ipfs-companion/issues/604
           const request = url2request('http://127.0.0.1:5001/ipfs/QmPhnvn747LqwPYMJmQVorMaGbMSgA7mRRoyyZYz3DoZRQ/')
           request.responseHeaders = [{ name: 'X-Ipfs-Path', value: '/ipfs/QmPhnvn747LqwPYMJmQVorMaGbMSgA7mRRoyyZYz3DDIFF' }]
@@ -431,21 +431,28 @@ describe('modifyRequest.onBeforeRequest:', function () {
       global.browser = browser
       state.ipfsNodeType = 'external'
       state.redirect = true
-      state.peerCount = -1
+      state.peerCount = -1 // this simulates Kubo RPC being offline
       state.gwURLString = 'http://localhost:8080'
       state.gwURL = new URL('http://localhost:8080')
       state.pubGwURLString = 'https://ipfs.io'
       state.pubGwURL = new URL('https://ipfs.io')
-      state.redirect = false
     })
     it('should present recovery page if node is offline', function () {
       expect(state.nodeActive).to.be.equal(false)
       const request = url2request('https://localhost:8080/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR/foo/bar')
       expect(modifyRequest.onBeforeRequest(request).redirectUrl).to.equal('chrome-extension://testid/dist/recovery/recovery.html#https%3A%2F%2Fipfs.io%2Fipfs%2FQmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR%2Ffoo%2Fbar')
     })
-    it('should not block requests when the request is redirecting', function () {
+    it('should not show recovery page if node is offline, redirect is enabled, but non-gateway URL failed to load from the same port', function () {
+      // this covers https://github.com/ipfs/ipfs-companion/issues/1162 and https://twitter.com/unicomp21/status/1626244123102679041
       state.redirect = true
       expect(state.nodeActive).to.be.equal(false)
+      const request = url2request('https://localhost:8080/')
+      expect(modifyRequest.onBeforeRequest(request)).to.equal(undefined)
+    })
+    it('should not show recovery page if extension is disabled', function () {
+      // allows user to quickly avoid anything similar to https://github.com/ipfs/ipfs-companion/issues/1162
+      state.active = false
+      expect(state.nodeActive).to.be.equal(false)
       const request = url2request('https://localhost:8080/ipfs/QmbWqxBEKC3P8tqsKc98xmWNzrzDtRLMiMPL8wBuTGsMnR/foo/bar')
       expect(modifyRequest.onBeforeRequest(request)).to.equal(undefined)
     })