@3846masa/http-signature/lib/parseSignature.js

Create / Verify HTTP Signatures (https://tools.ietf.org/html/draft-cavage-http-signatures-10)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const SignatureObject_1 = require("./SignatureObject");
function parseSignature(signature) {
    const result = {
        headers: 'date',
    };
    const state = {
        cursor: 0,
        mode: 'key',
        currentKey: '',
        currentValue: '',
    };
    for (let idx = 0; idx < signature.length; idx++) {
        const char = signature[idx];
        switch (state.mode) {
            case 'key': {
                if (char === '=') {
                    Object.assign(state, {
                        mode: 'prevalue',
                        currentKey: state.currentKey.trim(),
                    });
                }
                else {
                    Object.assign(state, {
                        currentKey: state.currentKey + char,
                    });
                }
                continue;
            }
            case 'prevalue': {
                if (char === '"') {
                    Object.assign(state, {
                        mode: 'value',
                    });
                }
                continue;
            }
            case 'value': {
                if (char === '"') {
                    result[state.currentKey] = state.currentValue.trim();
                    Object.assign(state, {
                        mode: 'postvalue',
                        currentKey: '',
                        currentValue: '',
                    });
                }
                else {
                    Object.assign(state, {
                        currentValue: state.currentValue + char,
                    });
                }
                continue;
            }
            case 'postvalue': {
                if (char === ',') {
                    Object.assign(state, {
                        mode: 'key',
                    });
                }
                continue;
            }
        }
    }
    if (!SignatureObject_1.isValidSignatureObject(result)) {
        throw new Error('keyId and signature paramerters should be required.');
    }
    return result;
}
exports.parseSignature = parseSignature;
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