feat: use nodeinfo for fediverse instance info

src/claim.js

@@ -270,7 +270,7 @@ export class Claim {
         const def = _data[claimData.about.id]
         if (def.functions?.postprocess) {
           try {
-            ({ claimData, proofData } = def.functions.postprocess(claimData, proofData))
+            ({ claimData, proofData } = await def.functions.postprocess(claimData, proofData, opts))
           } catch (_) {}
         }
       } else {

src/serviceProviders/activitypub.js

@@ -14,6 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 import * as E from '../enums.js'
+import { activitypub } from '../fetcher/index.js'
 import { ServiceProvider } from '../serviceProvider.js'
 
 export const reURI = /^https:\/\/(.*)\/?/
@@ -76,12 +77,151 @@ export function processURI (uri) {
 }
 
 export const functions = {
-  postprocess: (claimData, proofData) => {
+  postprocess: async (/** @type {ServiceProvider} */ claimData, proofData, opts) => {
-    claimData.profile.display = `@${proofData.result.preferredUsername}@${new URL(proofData.result.url).hostname}`
+    switch (proofData.result.type) {
+      case 'Note': {
+        claimData.profile.uri = proofData.result.attributedTo
+        const personData = await activitypub.fn({ url: proofData.result.attributedTo }, opts)
+        claimData.profile.display = `@${personData.preferredUsername}@${new URL(proofData.result.url).hostname}`
+        break
+      }
+
+      case 'Person':
+        claimData.profile.display = `@${proofData.result.preferredUsername}@${new URL(proofData.result.url).hostname}`
+        break
+
+      default:
+        break
+    }
+
+    // Attempt to fetch and process the instance's NodeInfo data
+    const nodeinfo = await _processNodeinfo(new URL(proofData.result.url).hostname)
+    if (nodeinfo) {
+      claimData.about.name = nodeinfo.software.name
+      claimData.about.id = nodeinfo.software.name
+      claimData.about.homepage = nodeinfo.software.homepage
+    }
+
     return { claimData, proofData }
   }
 }
 
+const _processNodeinfo = async (/** @type {string} */ domain) => {
+  const nodeinfoRef = await fetch(`http://${domain}/.well-known/nodeinfo`)
+    .then(res => {
+      if (res.status !== 200) {
+        throw new Error('HTTP Status was not 200')
+      }
+      return res.json()
+    })
+    .catch(_ => {
+      return null
+    })
+
+  if (!nodeinfoRef) return null
+
+  // NodeInfo version 2.1
+  {
+    const nodeinfo = nodeinfoRef.links.find(x => { return x.rel === 'http://nodeinfo.diaspora.software/ns/schema/2.1' })
+    if (nodeinfo) {
+      return await fetch(nodeinfo.href)
+        .then(res => {
+          if (res.status !== 200) {
+            throw new Error('HTTP Status was not 200')
+          }
+          return res.json()
+        })
+        .then(res => {
+          return {
+            software: {
+              name: res.software.name,
+              version: res.software.version,
+              homepage: res.software.homepage || 'https://activitypub.rocks'
+            }
+          }
+        })
+        .catch(_ => {
+          return null
+        })
+    }
+  }
+  // NodeInfo version 2.0
+  {
+    const nodeinfo = nodeinfoRef.links.find(x => { return x.rel === 'http://nodeinfo.diaspora.software/ns/schema/2.0' })
+    if (nodeinfo) {
+      return await fetch(nodeinfo.href)
+        .then(res => {
+          if (res.status !== 200) {
+            throw new Error('HTTP Status was not 200')
+          }
+          return res.json()
+        })
+        .then(res => {
+          return {
+            software: {
+              name: res.software.name,
+              version: res.software.version,
+              homepage: 'https://activitypub.rocks'
+            }
+          }
+        })
+        .catch(_ => {
+          return null
+        })
+    }
+  }
+  // NodeInfo version 1.1
+  {
+    const nodeinfo = nodeinfoRef.links.find(x => { return x.rel === 'http://nodeinfo.diaspora.software/ns/schema/1.1' })
+    if (nodeinfo) {
+      return await fetch(nodeinfo.href)
+        .then(res => {
+          if (res.status !== 200) {
+            throw new Error('HTTP Status was not 200')
+          }
+          return res.json()
+        })
+        .then(res => {
+          return {
+            software: {
+              name: res.software.name,
+              version: res.software.version,
+              homepage: 'https://activitypub.rocks'
+            }
+          }
+        })
+        .catch(_ => {
+          return null
+        })
+    }
+  }
+  // NodeInfo version 1.0
+  {
+    const nodeinfo = nodeinfoRef.links.find(x => { return x.rel === 'http://nodeinfo.diaspora.software/ns/schema/1.0' })
+    if (nodeinfo) {
+      return await fetch(nodeinfo.href)
+        .then(res => {
+          if (res.status !== 200) {
+            throw new Error('HTTP Status was not 200')
+          }
+          return res.json()
+        })
+        .then(res => {
+          return {
+            software: {
+              name: res.software.name,
+              version: res.software.version,
+              homepage: 'https://activitypub.rocks'
+            }
+          }
+        })
+        .catch(_ => {
+          return null
+        })
+    }
+  }
+}
+
 export const tests = [
   {
     uri: 'https://domain.org',