'use strict';
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const inherits = require('inherits');
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const Buffer = require('safer-buffer').Buffer;
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const DERDecoder = require('./der');
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function PEMDecoder(entity) {
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DERDecoder.call(this, entity);
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this.enc = 'pem';
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}
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inherits(PEMDecoder, DERDecoder);
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module.exports = PEMDecoder;
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PEMDecoder.prototype.decode = function decode(data, options) {
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const lines = data.toString().split(/[\r\n]+/g);
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const label = options.label.toUpperCase();
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const re = /^-----(BEGIN|END) ([^-]+)-----$/;
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let start = -1;
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let end = -1;
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for (let i = 0; i < lines.length; i++) {
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const match = lines[i].match(re);
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if (match === null)
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continue;
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if (match[2] !== label)
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continue;
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if (start === -1) {
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if (match[1] !== 'BEGIN')
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break;
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start = i;
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} else {
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if (match[1] !== 'END')
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break;
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end = i;
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break;
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}
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}
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if (start === -1 || end === -1)
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throw new Error('PEM section not found for: ' + label);
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const base64 = lines.slice(start + 1, end).join('');
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// Remove excessive symbols
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base64.replace(/[^a-z0-9+/=]+/gi, '');
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const input = Buffer.from(base64, 'base64');
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return DERDecoder.prototype.decode.call(this, input, options);
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};
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