doipjs/src/signatures.js

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/*
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Copyright 2021 Yarmo Mackenbach
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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 openpgp = require('openpgp')
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const Claim = require('./claim')
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const keys = require('./keys')
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/**
* @module signatures
*/
/**
* Extract data from a signature and fetch the associated key
* @async
* @param {string} signature - The plaintext signature to process
* @returns {Promise<object>}
*/
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const process = (signature) => {
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return new Promise(async (resolve, reject) => {
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let sigData,
result = {
fingerprint: null,
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users: [
{
userData: {},
claims: [],
},
],
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primaryUserIndex: null,
key: {
data: null,
fetchMethod: null,
uri: null,
},
}
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try {
sigData = await openpgp.cleartext.readArmored(signature)
} catch (error) {
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reject('invalid_signature')
return
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}
const issuerKeyId = sigData.signature.packets[0].issuerKeyId.toHex()
const signersUserId = sigData.signature.packets[0].signersUserId
const preferredKeyServer =
sigData.signature.packets[0].preferredKeyServer ||
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'https://keys.openpgp.org/'
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const text = sigData.getText()
let sigKeys = []
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text.split('\n').forEach((line, i) => {
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const match = line.match(/^([a-zA-Z0-9]*)\=(.*)$/i)
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if (!match) {
return
}
switch (match[1].toLowerCase()) {
case 'key':
sigKeys.push(match[2])
break
case 'proof':
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result.users[0].claims.push(new Claim(match[2]))
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break
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default:
break
}
})
// Try overruling key
if (sigKeys.length > 0) {
try {
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result.key.uri = sigKeys[0]
result.key.data = await keys.fetch.uri(result.key.uri)
result.key.fetchMethod = result.key.uri.split(':')[0]
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} catch (e) {}
}
// Try WKD
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if (!result.key.data && signersUserId) {
try {
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result.key.uri = `wkd:${signersUserId}`
result.key.data = await keys.fetch.uri(result.key.uri)
result.key.fetchMethod = 'wkd'
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} catch (e) {}
}
// Try HKP
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if (!result.key.data) {
try {
const match = preferredKeyServer.match(/^(.*\:\/\/)?([^/]*)(?:\/)?$/i)
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result.key.uri = `hkp:${match[2]}:${
issuerKeyId ? issuerKeyId : signersUserId
}`
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result.key.data = await keys.fetch.uri(result.key.uri)
result.key.fetchMethod = 'hkp'
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} catch (e) {
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reject('key_not_found')
return
}
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}
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result.fingerprint = result.key.data.keyPacket.getFingerprint()
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result.users[0].claims.forEach((claim) => {
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claim.fingerprint = result.fingerprint
})
const primaryUserData = await result.key.data.getPrimaryUser()
let userData
if (signersUserId) {
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result.key.data.users.forEach((user) => {
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if (user.userId.email == signersUserId) {
userData = user
}
})
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}
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if (!userData) {
userData = primaryUserData.user
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}
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result.users[0].userData = {
id: userData.userId ? userData.userId.userid : null,
name: userData.userId ? userData.userId.name : null,
email: userData.userId ? userData.userId.email : null,
comment: userData.userId ? userData.userId.comment : null,
isPrimary: primaryUserData.user.userId.userid === userData.userId.userid,
}
result.primaryUserIndex = result.users[0].userData.isPrimary ? 0 : null
resolve(result)
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})
}
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exports.process = process