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feat: encode record-store keys in pubsub (#9)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,31 @@ | ||
| 'use strict' | ||
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| const base32 = require('base32.js') | ||
| const multibase = require('multibase') | ||
| const errcode = require('err-code') | ||
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| const namespace = '/record/' | ||
| const base64urlCode = 'u' // base64url code from multibase | ||
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| module.exports.encodeBase32 = (buf) => { | ||
| const enc = new base32.Encoder() | ||
| return enc.write(buf).finalize() | ||
| return multibase.encode('base32', buf).slice(1) // slice off multibase codec | ||
| } | ||
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| // converts a binary record key to a pubsub topic key. | ||
| module.exports.keyToTopic = (key) => { | ||
| // Record-store keys are arbitrary binary. However, pubsub requires UTF-8 string topic IDs | ||
| // Encodes to "/record/base64url(key)" | ||
| const b64url = multibase.encode('base64url', key).slice(1).toString() | ||
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| return `${namespace}${b64url}` | ||
| } | ||
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| // converts a pubsub topic key to a binary record key. | ||
| module.exports.topicToKey = (topic) => { | ||
| if (topic.substring(0, namespace.length) !== namespace) { | ||
| throw errcode(new Error('topic received is not from a record'), 'ERR_TOPIC_IS_NOT_FROM_RECORD_NAMESPACE') | ||
| } | ||
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| const key = `${base64urlCode}${topic.substring(namespace.length)}` | ||
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| return multibase.decode(key).toString() | ||
| } |
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