mirror of https://codeberg.org/pzp/pzp-db.git
68 lines
1.4 KiB
JavaScript
68 lines
1.4 KiB
JavaScript
const FeedV1 = require('./feed-v1')
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/**
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* @typedef {import('./plugin').Rec} Rec
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*/
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function ciphertextStrToBuffer(str) {
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const dot = str.indexOf('.')
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return Buffer.from(str.slice(0, dot), 'base64')
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}
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/**
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* @param {Rec} rec
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* @param {any} peer
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* @param {any} config
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* @returns {Rec}
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*/
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function decrypt(rec, peer, config) {
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const msgEncrypted = rec.msg
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const { content } = msgEncrypted
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if (typeof content !== 'string') return rec
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const encryptionFormat = peer.db.findEncryptionFormatFor(content)
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if (!encryptionFormat) return rec
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// Decrypt
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const ciphertextBuf = ciphertextStrToBuffer(content)
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const opts = { keys: config.keys }
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const plaintextBuf = encryptionFormat.decrypt(ciphertextBuf, opts)
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if (!plaintextBuf) return rec
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// Reconstruct KVT in JS encoding
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const msgDecrypted = FeedV1.fromPlaintextBuffer(plaintextBuf, msgEncrypted)
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return {
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hash: rec.hash,
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msg: msgDecrypted,
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received: rec.received,
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misc: {
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...rec.misc,
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private: true,
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originalContent: content,
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encryptionFormat: encryptionFormat.name,
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},
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}
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}
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function reEncrypt(rec) {
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return {
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hash: rec.hash,
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msg: { ...rec.msg, content: rec.misc.originalContent },
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received: rec.received,
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...(rec.misc.size
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? {
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misc: {
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offset: rec.misc.offset,
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size: rec.misc.size,
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},
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}
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: null),
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}
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}
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module.exports = {
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decrypt,
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reEncrypt,
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}
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