Implement Telegram support

src/claimDefinitions/index.js

@@ -18,6 +18,7 @@ const list = [
   'irc',
   'xmpp',
   'matrix',
+  'telegram',
   'twitter',
   'reddit',
   'liberapay',
@@ -39,6 +40,7 @@ const data = {
   irc: require('./irc'),
   xmpp: require('./xmpp'),
   matrix: require('./matrix'),
+  telegram: require('./telegram'),
   twitter: require('./twitter'),
   reddit: require('./reddit'),
   liberapay: require('./liberapay'),

src/claimDefinitions/telegram.js

@@ -0,0 +1,78 @@
+/*
+Copyright 2021 Yarmo Mackenbach
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+const E = require('../enums')
+
+const reURI = /^tg:user=([a-zA-Z0-9_]{5,32})&chat=([a-zA-Z0-9_]{5,32})/
+
+const processURI = (uri) => {
+  const match = uri.match(reURI)
+
+  return {
+    serviceprovider: {
+      type: 'communication',
+      name: 'telegram'
+    },
+    match: {
+      regularExpression: reURI,
+      isAmbiguous: false
+    },
+    profile: {
+      display: `@${match[1]}`,
+      uri: `https://t.me/${match[1]}`,
+      qr: null
+    },
+    proof: {
+      uri: null,
+      request: {
+        fetcher: E.Fetcher.TELEGRAM,
+        access: E.ProofAccess.GRANTED,
+        format: E.ProofFormat.JSON,
+        data: {
+          user: match[1],
+          chat: match[2]
+        }
+      }
+    },
+    claim: {
+      format: E.ClaimFormat.FINGERPRINT,
+      relation: E.ClaimRelation.EQUALS,
+      path: ['text']
+    }
+  }
+}
+
+const tests = [
+  {
+    uri: 'tg:user=alice&chat=foobar',
+    shouldMatch: true
+  },
+  {
+    uri: 'tg:user=complex_user_1234&chat=complex_chat_1234',
+    shouldMatch: true
+  },
+  {
+    uri: 'tg:user=&chat=foobar',
+    shouldMatch: false
+  },
+  {
+    uri: 'tg:user=foobar&chat=',
+    shouldMatch: false
+  }
+]
+
+exports.reURI = reURI
+exports.processURI = processURI
+exports.tests = tests

src/enums.js

@@ -49,6 +49,8 @@ const Fetcher = {
   XMPP: 'xmpp',
   /** HTTP request to Matrix API */
   MATRIX: 'matrix',
+  /** HTTP request to Telegram API */
+  TELEGRAM: 'telegram',
   /** HTTP request to Twitter API */
   TWITTER: 'twitter'
 }

src/fetcher/index.js

@@ -18,5 +18,6 @@ exports.dns = require('./dns')
 exports.http = require('./http')
 exports.irc = require('./irc')
 exports.matrix = require('./matrix')
+exports.telegram = require('./telegram')
 exports.twitter = require('./twitter')
 exports.xmpp = require('./xmpp')

src/fetcher/telegram.js

@@ -0,0 +1,110 @@
+/*
+Copyright 2021 Yarmo Mackenbach
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+const axios = require('axios')
+const validator = require('validator')
+
+/**
+ * @module fetcher/telegram
+ */
+
+/**
+ * The single request's timeout value in milliseconds
+ * This fetcher makes two requests in total
+ * @constant {number} timeout
+ */
+module.exports.timeout = 5000
+
+/**
+ * Execute a fetch request
+ * @function
+ * @async
+ * @param {object} data                          - Data used in the request
+ * @param {string} data.chat                     - Telegram public chat username
+ * @param {string} data.user                     - Telegram user username
+ * @param {object} opts                          - Options used to enable the request
+ * @param {string} opts.claims.telegram.token    - The Telegram Bot API token
+ * @returns {object|string}
+ */
+module.exports.fn = async (data, opts) => {
+  let timeoutHandle
+  const timeoutPromise = new Promise((resolve, reject) => {
+    timeoutHandle = setTimeout(
+      () => reject(new Error('Request was timed out')),
+      data.fetcherTimeout ? data.fetcherTimeout : module.exports.timeout
+    )
+  })
+
+  const apiPromise = (method) => new Promise((resolve, reject) => {
+    try {
+      validator.isAscii(opts.claims.telegram.token)
+    } catch (err) {
+      throw new Error(`Telegram fetcher was not set up properly (${err.message})`)
+    }
+
+    if (!data.chat || !data.user) {
+      reject(new Error('Both chat name and user name must be provided'))
+      return
+    }
+
+    const url = `https://api.telegram.org/bot${opts.claims.telegram.token}/${method}?chat_id=@${data.chat}`
+    axios.get(url, {
+      headers: {
+        Accept: 'application/json',
+        'User-Agent': `doipjs/${require('../../package.json').version}`
+      },
+      validateStatus: (status) => status === 200
+    })
+      .then(res => resolve(res.data))
+      .catch(e => reject(e))
+  })
+
+  const fetchPromise = apiPromise('getChatAdministrators').then(admins => {
+    if (!admins.ok) {
+      throw new Error('Request to get chat administrators failed')
+    }
+
+    return apiPromise('getChat').then(chat => {
+      if (!chat.ok) {
+        throw new Error('Request to get chat info failed')
+      }
+
+      let creator
+      for (const admin of admins.result) {
+        if (admin.status === 'creator') {
+          creator = admin.user.username
+        }
+      }
+
+      if (!chat.result.description) {
+        throw new Error('There is no chat description')
+      }
+
+      if (creator !== data.user) {
+        throw new Error('User doesn\'t match')
+      }
+
+      return {
+        user: creator,
+        text: chat.result.description
+      }
+    })
+  })
+
+  return Promise.race([fetchPromise, timeoutPromise]).then((result) => {
+    clearTimeout(timeoutHandle)
+    return result
+  })
+}

src/proxy/api/v2/index.js

@@ -28,6 +28,9 @@ const opts = {
       instance: process.env.MATRIX_INSTANCE || null,
       accessToken: process.env.MATRIX_ACCESS_TOKEN || null
     },
+    telegram: {
+      token: process.env.TELEGRAM_TOKEN || null
+    },
     xmpp: {
       service: process.env.XMPP_SERVICE || null,
       username: process.env.XMPP_USERNAME || null,
@@ -172,6 +175,30 @@ router.get(
   }
 )
 
+// Telegram route
+router.get(
+  '/get/telegram', query('chat').isString(),
+  async (req, res) => {
+    if (!opts.claims.telegram.token) {
+      return res.status(501).json({ errors: 'Telegram not enabled on server' })
+    }
+
+    const errors = validationResult(req)
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() })
+    }
+
+    fetcher.telegram
+      .fn(req.query, opts)
+      .then((data) => {
+        return res.status(200).send(data)
+      })
+      .catch((err) => {
+        return res.status(400).json({ errors: err.message ? err.message : err })
+      })
+  }
+)
+
 // IRC route
 router.get('/get/irc', query('nick').isString(), async (req, res) => {
   if (!opts.claims.irc.nick) {